JP3201726B2 - Loading method of sintering raw material using magnetic force - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for charging a sintering raw material using magnetic force to a Dwyroid type sintering machine for producing a sintered ore which is one of the blast furnace charging raw materials. In the sintering raw material layer deposited on the pallet of the sintering machine, a magnetized sintering raw material such as a mill scale containing a large amount of metallic iron, ore return containing calcium ferrite, or a fine-grained sintering raw material is formed by a sintering raw material layer. The present invention relates to a method of charging a pallet so as to segregate a large amount in the upper layer.

[0002]

2. Description of the Related Art In order to produce a sintered ore with a Dwyroid type sintering machine (hereinafter referred to as a DL sintering machine), first, an iron source containing metallic iron such as powdered iron ore, sand iron, and mill scale is used. After adding limestone, serpentine, ore, and the like as auxiliary materials, and adding and mixing coke powder, gas ash, and the like as a fuel source, the sintering material is adjusted to about 7% moisture, granulated, and then subjected to DL as shown in FIG. A sintering raw material 2 in a feed hopper 1 provided in the sintering machine is cut out using a drum feeder 3 and supplied to a plate-type sloping chute 4. The sintering raw material 2 segregates in particle size due to percolation (filtration and permeation) when sliding down on the sloping chute 4, and the fine sintering raw material in the lower layer portion is
In addition, a coarse sintering raw material is segregated in the upper and middle layers.

[0003] When the sintering raw material 2 thus segregated up and down is loaded on the pallet 5 which continuously moves in the direction of the arrow from the lower end of the sloping chute 4, the upper and lower particle segregation is reduced. The sintering raw material layer 7 having a predetermined thickness is formed in a state where the relatively fine sintering raw material is segregated in the upper layer portion and the coarse sintering raw material segregates in the middle and lower layer portions. Thereafter, the surface layer of the sintering raw material layer 7 is ignited by an ignition burner (not shown),
In the process of advancing the pallet 5 to the rear end side of the sintering machine while sucking the air above the sintering raw material layer 7 downward from a great bar provided on the pallet 5 with an air blower (not shown), sintering is performed. The sintering of the raw material 2 is performed, thereby producing a sintered ore.

[0004] At this time, the particle size distribution and composition distribution of the raw material deposited in the height direction of the sintering raw material layer have an important influence on the results of the sintering operation. That is, in the initial stage of ignition by the ignition furnace,
By suction from below the pallet 5, air passes through the inside of the sintering raw material layer 7 whose surface has been ignited downward from the surface. At this time, the normal-temperature air is supplied to the sintering molten zone (for example, a region of 1200 ° C. or higher) formed in the upper layer of the sintering raw material layer 7 without being preheated. On the other hand, during and after the sintering, the air sucked downward passes through the sintering completion region formed in the upper layer of the sintering raw material layer, and is preheated, and then the air is drawn into the sintering raw material layer. It is supplied to the sintering molten zone formed in the lower layer.

[0005] Therefore, the upper layer of the sintering raw material layer has a lower temperature in the layer and a shorter time for keeping the temperature higher than the middle and lower layers, so that the sintered ore generated in the upper layer has a low degree of fusion bonding. Therefore, there is a problem that the strength of the sintered ore is low and the yield of the sintered ore is reduced. Therefore, in recent years, as a method of charging the sintering raw material, segregation charging that intentionally changes the raw material particle size distribution and the carbon content in the height direction of the sintering raw material layer deposited on the pallet has been actively adopted. This has helped to solve the above problems.

For example, in JP-A-61-223136,
By providing a screen made of a plurality of strips extending along the flow of the sintering raw material charged on the pallet, the density of the sintering raw material layer formed after charging on the pallet is reduced, and the upper layer is formed. It is stated that by setting a segregation state in which fine grains accumulate in the part and coarse grains accumulate in the middle and lower parts, it is possible to achieve an improvement in sinter ore yield and an improvement in productivity by improving air permeability in the upper part. However, this method has a problem that a sintering material having a water content of about 7% adheres to a plurality of strips, and it is difficult to stably maintain the initially expected segregation state of the sintering material layer. Was.

In Japanese Patent Application Laid-Open No. 63-263386, a plurality of wires are installed perpendicular to the flow direction of the sintering raw material being charged, and the area of the opening between the wires is adjusted to charge the sintering material. The sintering material layer formed on the pallet afterwards has a low density, segregated state in which fine particles are present in the upper layer and coarse particles are present in the lower layer, and the yield of sinter is improved by improving air permeability in the upper layer And increase productivity.

In this method, in order to prevent the sintering material from adhering to the wire, the sintering material is removed by moving the wire using a winding drum. It is very difficult to remove the sintering raw material clogged in between, and there has been a problem that the initially expected segregation state of the sintering raw material layer cannot be stably maintained.

On the other hand, JP-A-5-311257 discloses that a combustible gas and a low melting point molten material are mixed and sprayed onto an upper layer of a sintering material layer deposited on a pallet using ordinary sintering material. A method is disclosed. In this method, the calorific value of the flammable gas and the low melting point molten material are additionally supplied to the upper layer of the sintering material layer deposited on the pallet, so that the sintering reaction there is increased and a high strength sinter is obtained. Supply of combustible gas,
Another problem is that new equipment is required to mix low-melting-point raw materials and transport or blow them in, so the equipment cost required to significantly increase or remodel the equipment is enormous. .

Further, in Japanese Patent Application Laid-Open No. 58-133333, an electromagnet is provided in a sintering raw material charging apparatus, and a sintering material falling from the electromagnet is charged on a pallet while applying a magnetic force to the sintering raw material. A method for doing so is disclosed. Specifically, an electromagnet is attached to a roll feeder or the like provided below the mining hopper, and the electromagnet exerts a magnetic force on metallic iron (Fe) existing in the sintering raw material being charged, causing the magnet to fall. Reduce the speed to achieve soft loading of raw materials. At the same time, the raw material particles having a small particle size are relatively more affected by the magnetic force than the material particles having a large particle size, so that the smaller the particle size, the lower the falling speed, and the larger the particle size, the earlier the particles fall and deposit on the pallet. It is stated that coarse particles are charged in the lower layer of the sintering material layer and fine particles are charged in the upper layer, so that a segregated state is obtained in the sintering material layer.

However, in the case where the electromagnet is attached to the rotary feeder, the segregation is turned upside down when the raw material subjected to particle size segregation here is fed from the rotary feeder onto the sloping plate, which may have an adverse effect. It is also conceivable to separate the adhered Fe component by repeatedly turning the electromagnet on and off, but this has the problem that the magnetic field action and the separation action are not continuous, stable segregation cannot be obtained, and the efficiency is poor. Dots remain.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention does not require additional installation of additional anti-adhesion equipment or a new auxiliary material addition apparatus which requires a huge capital investment. A magnetic force acts on the sintering raw material charged immediately before, thereby consciously changing the raw material composition and the particle size distribution in the height direction of the sintering raw material layer, and causing the sintering raw material layer to occur in a normal operation. It is an object of the present invention to provide a method of charging a sintering raw material using magnetic force, which reduces generation of brittle sinter in an upper layer portion and improves sintering yield.

[0013]

According to the first aspect of the present invention, a sintering raw material is cut out from a feed hopper by using a drum feeder, and cut out on a pallet of a Dwyroid type sintering machine. charged in charging method of the sintered material to form a sintered material layer, wherein the sintered material was cut out using a drum feeder slide down on sloping chute of the plate, from the tip to the pallet when it is charged, the magnetic force by the action of the flow of the sintering raw material by a cylindrical magnet drum disposed below the sloping chute, the magnetizability sintered material on the lower layer side of the sintering raw material by the magnetic force attracted Rutotomoni is magnetized to the magnet drum, slow fines material of the falling speed is segregated to the lower side of the sintered material, when charged onto the pallet through the magnet drum The upper and lower layers inversion of the serial sintered raw materials, before
Charging method of sintering material using a magnetic force for causing many segregate the magnetizability sintered material and fall slower the fine material in the upper portion of the sintering material layer formed serial pallet It is.

[0014] According to a second aspect of the invention, the sintered material adhering to the magnet drum, according to claim 1, wherein the scraping on the magnet drum by contacting the scraper and collecting on the pallet This is a method of charging a sintering raw material using the magnetic force of the above. Endless belt between the invention of claim 3, wherein said <br/> magnet drum that is disposed below the sloping chute of the flop <br/> rate equation, a drum provided to face the magnet drum together pass over the said end <br/> disposed abutting the scraper on the surface of the dress belt, before
Charging the sintering material using a magnetic force according to claim 1, wherein said sintered material adhering to the serial endless belt as a drop off by the disk <br/> Repa and collecting on the pallet Is the way.

[0015] According to a fourth aspect of the invention, spaced just below the sloping chute the flop <br/> rate equation for conventional as well as installing an auxiliary sloping chute parallel plate-type, the sloping chute conventional before the other hand from the operating position it is placed freely reciprocate obliquely upward retracted position, which is placed forward and backward freely the magnetic <br/> stone drum installed below the sloping chute in a horizontal direction and common
Move the serial sloping chute from the operating position obliquely above the retracted position, during operation of removing the sintered material adhered thereto, when charged with the sintered material through the auxiliary sloping chute the lower to, by Rukoto to move the magnet drum under side of the auxiliary sloping chute, and wherein the sintering raw material to the magnet drum from said auxiliary sloping chute can be adjusted to fall trajectory moves unchanged A method for charging a sintering raw material using magnetic force according to claim 1, 2 or 3.

[0016] According to a fifth aspect of the invention, by the plate-type permanent magnet is placed at the bottom rear surface of the sloping chute, it exerts a magnetic force from the permanent magnet in the sintering raw material sliding down on the sloping chute, Previous
To move from serial sloping chute to the magnet drum
5. The method for charging a sintering raw material using magnetic force according to claim 1, wherein the falling speed of the sintering raw material is reduced.

[0017] According to a sixth aspect of the invention, in opposition to the upstream side of the magnet drum that is installed below the sloping chute of the plate type is placed an auxiliary magnetic drum, the said magnetic <br/> stone drum claim 1, wherein the magnetizable sintered material fails to magnetized to the magnet drum of the sintered material falling between the auxiliary magnet drum that is magnetized by the magnetic force from said auxiliary magnet drum 2,3,4 or 5
This is a method for charging a sintering raw material using the described magnetic force.

According to a seventh aspect of the present invention, there is provided a first-stage magnet drum disposed below an upper plate-type sloping chute and a second-stage magnet drum disposed below a lower plate-type sloping chute. before the door is installed two stages in series, slide down the upper sloping chute above
Serial magnetizability sintered material so the magnetized by magnetic force from the magnet drum of the first stage, continuing the magnetizability sintered material slide down the lower sloping chute above the magnet drum of the second stage The method for charging a sintering raw material using a magnetic force according to any one of claims 1, 2, 3, 4, 5, and 6, wherein the magnetic material is magnetized by the magnetic force.

According to the present invention, a sintering raw material is cut out from a feed hopper by using a drum feeder, and the sintering raw material is loaded on a pallet of a Dwyroid type sintering machine to form a sintering raw material layer. in charging method of the raw materials, during the said sintered material was cut using a drum feeder, sliding down along with arranging the magnet drum drive side is arranged the driven side drum obliquely upward belt conveyor type sloping chute above, after segregated on the lower side slow with fine material of the falling speed is magnetized magnetizability sintering raw material by its magnetic force while forward or reverse the magnet drum, said pallet from said conveyor belt type sloping chute This is a method for charging a sintering raw material using magnetic force, which is characterized by direct charging.

According to a ninth aspect of the present invention, there is provided a sintering method in which a sintering raw material is cut out from a mining hopper using a drum feeder, and is loaded on a pallet of a Dwyroid type sintering machine to form a sintering raw material layer. In the method for charging raw materials, a magnetic drum is installed below the drum feeder, and the sintered raw material cut out using the drum feeder is dropped on the magnetic drum.
It is, prior to rotating in the same direction as the falling direction of the sintering raw material
After force is segregated on the lower layer side slow with fine material of by applying the falling speed is magnetized magnetizable sintered material of the sintered raw material by serial magnetic drum, and charging on the pallet from the magnet drum The upper and lower layers of the sintering raw material
And an upper layer portion of the sintering raw material formed on the pallet.
The magnetized sintering raw material and the fine-grain
This is a method for charging a sintering raw material using magnetic force, characterized by segregating a large amount of material.

The invention of claim 10 wherein the magnitude of the magnetic force of the magnet drum in accordance with the target amount of the magnetizability sintered material segregated in the upper portion of the sintering material layer charged to the pallet The method for charging a sintering raw material using a magnetic force according to claim 1, wherein the rotation speed is adjusted. In the present invention according to claim 11, a sintering raw material is cut out from a feed hopper using a drum feeder and charged on a pallet of a Dwyroid type sintering machine to form a sintering raw material layer. in entrance process, the sintered material was cut with the drum feeder, sliding on the sloping chute plate-type
A plurality of permanent magnets are arranged in series in the sliding direction along the back side of the falling part, and the plurality of permanent magnets are moved downward.
Arranged so that the magnitude of the magnetic force increases as going toward
While sliding down said plate-type sloping chute above that, after being segregated on the lower side with magnetizability sintering raw material magnetized not fall slower fine raw material by magnetic force from the permanent magnet, from the sloping chute a loading method of sintering material using a magnetic force, characterized in that directly loaded onto the path <br/> cmdlet.

[0022] The present invention according to claim 12, depending on the target amount of the magnetizability sintered material segregated in the upper portion of the sintering material layer charged to the pallet on the magnetic force of the permanent magnet size 12. The method for charging a sintering raw material using a magnetic force according to claim 11, wherein The present invention according to claim 13, the bulk density of the sintering raw material layer charged on the pallet
Claims, characterized in that for adjusting the magnitude of the magnetic force of the permanent <br/> magnet acting on the adhesive magnetic sintered material in accordance with the target value
11. A method for charging a sintering raw material using the magnetic force described in 11 .

[0023]

[0024]

In DETAILED DESCRIPTION OF THE INVENTION The present invention, percolation (filtration, percolation) of the sintered material when sliding down the sloping shoe over <br/> preparative above by the conventional as by a particle size segregation effect,
A coarse-grained sintering raw material having a large grain size is present in the middle layer portion and a fine-grained sintering raw material having a small grain size is present in the lower layer portion, thereby segregating the grain size. Sintering raw material this way is promoted particle size segregation by percolation on sloping shoe over preparative it is, in the inserted from its tip on a pallet, cylindrical with a built-in permanent magnets or electromagnets installed beneath the sloping chute A magnetic force is applied to the flow of the sintering raw material by the magnet drum to magnetize the magnetized sintering raw material such as mill scale and ferrite containing calcium ferrite on the outer peripheral surface of the outer ring constituting the magnet drum. , And segregate to the lower layer side of the sintering raw material.

The sintering raw material moving on the pallet via the magnet drum exerts a magnetic force on the magnetized sintering raw material from a permanent magnet or an electromagnet incorporated in the magnet drum, and its falling speed is weakened. Will be charged. That is, raw material particles having a small particle size are relatively more strongly affected by magnetic force than raw material particles having a large particle size, so that the raw material particles having a small particle size have a lower falling speed, and therefore, the raw material particles having a large particle size fall earlier. To the lower part of the sintering material layer. According summary to the present invention, on the side (lower side of the sintering raw material) close magnetizable sintered material and a drop slower fine material is magnetized by the magnetic force on the outer peripheral surface of the magnet drum from magnet drum Segregate. For this reason, coarse particles and weak magnetic or non-magnetic sintering material are segregated on the side farther from the outer peripheral surface of the magnet drum (on the upper side of the sintering material and in the middle layer).

When the sintering raw material segregated in the manner described above is turned upside down when the sintering raw material is subsequently loaded on the pallet from the magnet drum, the sintering raw material layer loaded on the pallet is replaced with the upper layer. Magnetized sintering raw materials such as mill scale containing a large amount of ferromagnetic iron or ferrite containing calcium ferrite, and fine-grained sintering materials with a slow falling speed are surely contained in the middle part. A large amount of granular raw material and weak or non-magnetic sintered raw material are contained, and good segregation is obtained. Further, in the present invention, the sintering material attached to the cylindrical magnet drum containing a permanent magnet or an electromagnet is scraped off finely by a scraper and removed on a pallet, so that magnetic force always acts efficiently on the flow of the sintering material. The sintering material can be stably charged from the magnet drum onto the pallet.

Further, according to the present invention, if the magnitude of the magnetic force of the permanent magnet or the electromagnet incorporated in the magnet drum is adjusted, or if the rotation speed of the magnet drum incorporating the permanent magnet or the electromagnet is adjusted, the sintering can be performed. Depending on the brand of raw material, that is, the difference in particle size distribution and chemical composition, the amount of magnetized sintering raw material and fine-grained sintering raw material contained in the upper part of the sintering raw material layer loaded on the pallet is determined. It can be adjusted as desired and its sinterability can be improved. As a result, the upper layer of the sintering material layer also has a high sintering strength, and as a whole, an operation with a high sintering yield becomes possible.

When a permanent magnet is built in the magnet drum, power is not required as compared with a case in which an electromagnet is built in, so that the power consumption can be reduced, and the above effects can be obtained simply and at low cost. If the magnitude of the magnetic force of the permanent magnet is adjusted by adjusting the number of revolutions of the magnet drum, the amount of the magnetized sintering material in the upper layer of the sintering material layer can be adjusted efficiently and easily. If the operating conditions of the sintering machine are significantly changed, it can be dealt with by replacing the permanent magnet with a different magnetic force or by replacing the permanent magnet with a built-in magnet with a different magnetic force. In addition,
Permanent magnets have excellent performance, can last 10 to 20 years, and can be used semi-permanently and stably.

When an electromagnet is incorporated in the magnet drum, it is possible to easily cope with a change in the operating conditions of the sintering machine only by changing the electrical conditions applied to the electromagnet. It is possible. Hereinafter, the history of the invention and specific embodiments of the invention will be described in detail with reference to the drawings.

In order to achieve the above object of the present invention, the present inventors have made various studies on a method for charging a sintering raw material,
In the upper part of the sintering raw material layer deposited on the pallet, when a large amount of sintering raw material containing ferromagnetic mill scale with large ferromagnetic content, calcium ferrite return or iron ore, etc. is segregated, the mill scale FeO reacts with SiO ₂ derived from limestone or iron ore, and the CaO-FeO-SiO ₂ system has a low melting point (about 11
(80 ° C) A melt was formed, and the melt was considered to have an effect of promoting the bonding between ores because of its low viscosity due to the high FeO content.

In addition, during the ore return, a large amount of calcium ferrite in which lime (CaO) and iron ore (Fe ₂ O ₃ ) have already reacted is contained, and since these have reacted once, the reaction speed is high. Therefore, it was considered that the sintering reaction sufficiently proceeded even in the upper layer portion of the sintering raw material layer where the time during which the temperature was maintained at a high temperature was small. Then, a confirmation experiment based on a sintering raw material having a compounding composition necessary for producing a normal sintered ore shown in Table 1 was performed. At that time, the magnetized sintering raw material such as mill scale or ferrite containing ferrite, which shows ferromagnetism, adheres to the magnet compared to the hematite-based iron ore powder, which is most commonly used as a normal sintering raw material. In order to utilize the easy-to-use property, the sintering operation of the sintering raw material was performed by installing the sintering raw material charging apparatus shown in FIG. 1 in a DL type sintering machine.

[0032]

[Table 1]

As shown in FIG. 1, a sintering raw material 2 in a feed hopper 1 provided in a DL-type sintering machine is cut out using a drum feeder 3 and continuously cut through a plate-type sloping chute 4 in the direction of the arrow. The sintering raw material layer 7 is loaded on the pallet 5 which moves in the same manner as in the prior art.
In the present invention, a cylindrical magnet drum 6 containing a permanent magnet is installed below the sloping chute 4, and the magnet drum 6 is used to remove sintering material deposits so as to contact the outer peripheral surface thereof. A scraper 8 and a plurality of sub-scrapers 18 are provided. In the drawing, four sub-scrapers 18 are arranged at equal intervals vertically and horizontally on the outer peripheral surface of the magnet drum 6. The main scraper 8 provided on the return side of the magnet drum 6 must be provided, but the sub-scraper 18 is provided according to the ease with which the sintering raw material 2 adheres to the magnet drum 6, The number and position of the sintering materials may be determined according to the state of adhesion of the sintering raw materials.

The sub-scraper 18 is a magnet drum 6
Are provided on the outer peripheral surface of the permanent magnet 11.
The raw material that has been magnetized when it goes out of the arrangement region is easily dropped, and fulfills a scraper function, which is effective in reducing wear of the magnet drum 6. Column-shaped magnet drum 6
As shown in FIG. 2, the inner ring 9 comprises an inner ring 9 and an outer ring 10 provided concentrically. The inner ring 9 is a fixed type that does not rotate, and the material is not specified. A plurality of permanent magnets 11 are arranged and mounted so as to be close to the inner peripheral surface of the outer ring 10 on the side where the sintering raw material 2 to be contacted. The outer ring 10 has a width enough to guide the sintering raw material 2 supplied from the sloping chute 4 and is selected from ceramics, stainless steels, copper alloys and the like having excellent wear resistance in consideration of life and cost. The sintering raw material 2 is a non-magnetic material, and is rotationally driven in a falling direction (arrow direction) of the sintering raw material 2 using a driving device (not shown). In the outer ring 10, a portion corresponding to the permanent magnet 11 is a magnetic generation region, and the other portion is a non-magnetic region.

The length of the magnetic generation region in which the permanent magnet 11 attached to the fixed inner ring 9 causes a magnetic force to act on the outside of the outer ring 10 varies from just below the lower end of the sloping chute 4 to the non-magnetic region based on the sintering raw material conditions. Installed main scraper 8
Can be set appropriately between the mounting positions. The case where the permanent magnet 11 is fixedly mounted on the inner ring 9 which is fixed and supported so as not to rotate is shown, but the present invention is not limited to this. If the number of permanent magnets 11 can be arranged close to the inner peripheral surface of the outer ring 10 by a fixed type, the fixing means is not specified. In addition,
It is preferable that the position of the magnet drum 6 with respect to the sloping chute 4 is adjustable, so that the magnet drum 6 can be adjusted to an optimum position flexibly according to various conditions of the sintering raw material 2 introduced from the sloping chute 4. can do.

The sintering raw material 2 cut out from the feed hopper 1 using the drum feeder 3 is subjected to sintering on the sloping chute 4 due to segregation of the particle size due to percolation of the sintering raw material 2 when sliding down on the sloping chute 4. The raw material 2 has coarse particles having a large particle size in the upper and middle layers and fine particles having a small particle size in the lower layer, and moves to the magnet drum 6 as it is. In the present invention, the permanent magnet 11
Only the magnetized sintering raw material such as mill scale and returned ore, which exhibits ferromagnetism that is easily attracted to the outer ring 10, is magnetized on the outer ring 10 in the magnetic generation region by the permanent magnets 11 arranged in the magnet drum 6.

That is, as shown in FIG.
A magnetized sintering raw material such as a mill scale and returned ore that exhibits ferromagnetism is sucked, and a segregated raw material 2A including this magnetized sintering raw material and a fine-grained raw material having a slow falling speed is used as another main raw material, red. It moves between the coarse-grained raw material 2B such as iron ore and limestone and the raw material 2C with low magnetism to the outer ring 10 side to be magnetized. Therefore, segregation of the sintering raw material 2 is further promoted in this magnetic generation region, and segregation is strengthened.

As described above, segregation is further promoted by the magnetic force of the magnet drum 6. Therefore, in the magnetic generation region of the outer ring 10, magnetic sintering such as mill scale or returned ore, which exhibits ferromagnetism, is provided below the sintering raw material 2. The segregated raw material 2A including the raw material and the fine-grained raw material having a slow falling speed is unevenly distributed, and the coarse-grained raw material 2B and the low-magnetic raw material 2C are unevenly distributed in the upper and middle layers. When the sintering raw material 2 whose segregation is strengthened by the magnet drum 6 reaches the non-magnetic region of the outer ring 10 constituting the magnet drum 6 and is loaded on the pallet 5, the sintering raw material 2 is turned upside down. Pallet 5
In the sintering raw material layer 7 charged above, the upper part 7A contains a large amount of magnetized sintering raw material and fine-grained raw material having a slow falling speed, and the middle and lower part 7B
A segregation state occurs in which a large amount of coarse-grained raw materials and low-magnetic raw materials are often present.

In this case, according to the target amount of the magnetized sintering raw material, such as mill scale and returned ore, existing in the upper layer portion 7A of the sintering raw material layer 7 deposited on the pallet 5, it is incorporated in the magnet drum 6. If the magnitude of the magnetic force of the permanent magnet 11 is adjusted,
The magnetized sintering raw material segregated in the upper layer portion 7A can be maintained at a target amount. Here, the adjustment of the magnitude of the magnetic force involves changing the strength of the magnetic field of the permanent magnet 11 by appropriately changing the position, changing the positional relationship between the magnet drum, and changing the positional relationship between the magnet drum and the sloping chute. That can be done. Further, by adjusting the rotation speed of the magnet drum 6, it is possible to adjust the magnetized sintering raw material present in the upper layer portion 7A to a target amount online.
The sintering material attached to the outer ring 10 is scraped off by the main scraper 8 disposed in the non-magnetic region, and the pallet 5
It is dropped and collected. Some are removed by appropriately disposed sub-scrapers 18.

The sintering raw material layer 7 formed on the pallet 5 by the sintering raw material 2 charged through the magnet drum 6 in this manner has an upper layer portion 7A on which a mill scale, returned ore, iron ore or the like is formed. Because it contains a lot of magnetized sintered materials showing ferromagnetism,
FeO in mill scale is SiO ₂ derived from limestone and iron ore
To produce a low melting point (approximately 1180 °) melt of the CaO-FeO-SiO ₂ system, and the melt has a low viscosity due to a high FeO content and promotes bonding between ores. In addition, during the ore return, calcium lime (CaO) and iron ore (Fe ₂ O ₃ ) already contain a large amount of calcium ferrite that has reacted, and since these react once, the reaction rate is high, The sintering reaction can sufficiently proceed even in the upper layer portion 7A where the time for which the temperature is maintained at a high temperature is short. As a result, the sintering strength of the upper part 7A of the sintering raw material layer 7 is improved, and the strength of the sinter of the entire sinter can be improved by combining the middle and lower parts 7B.

Table 2 shows examples of blending conditions for the sintering raw materials used.

[0042]

[Table 2]

The results of this confirmation operation are shown in FIGS. 5, 6 and 7 in the case of the present invention in which the columnar magnet drum 6 having the permanent magnet 11 built in is installed below the plate-type sloping chute 4. This figure shows a comparison with a conventional example in which only a plate-type sloping chute without a magnet drum is used. Relationship between the height of the sintering raw material layer loaded on the pallet from the great bar and the mill scale content (%) (FIG. 5), the relationship with the ore return content (%) (FIG. 6), and sintering As is clear from the relationship with the arithmetic mean diameter (mm) of the raw material (FIG. 7), according to the present invention, a mill is provided on the upper portion of the sintering raw material layer 7 on the pallet 5 as compared with the conventional example. Magnetized sintering raw materials and fine-grained raw materials such as scale, ore returned, and FeO-containing raw materials were segregated in large amounts, and weakly magnetic, non-magnetic and coarse-grained raw materials could be segregated in the middle and lower layers.

In the present invention, as shown in FIG. 3, an electromagnet 12 having a coil wound around an iron core may be attached to the inner ring 9 constituting the cylindrical magnet drum 6 instead of the permanent magnet. Also in this case, the outer ring 10 is made of a non-magnetic material, and the main scraper 8 and the sub-scraper 18 as necessary are attached. If the number of electromagnets 12 that are turned on by passing a current is selected, the length of the magnetic generation area via the outer ring 10 can be adjusted freely.If a demagnetization area is provided on the return side as necessary, The detachment of the attached sintering raw material is facilitated. In this case, the electromagnet 12 preferably has an AC magnetic field. This is because the AC magnetic field is easier to remove the raw material particles magnetized once and is superior in operability.

As shown in FIG. 3, the same operation and effect as those described with reference to FIGS. 1 and 2 can be obtained even when a magnet drum having a built-in electromagnet is used, and a detailed description thereof will be omitted. Using the sintering raw materials shown in Table 2, the sintering raw material charging method according to the present invention and the conventional charging method were carried out, and the effects were investigated based on the sintering operation results.

In the method for charging a sintering raw material according to the present invention, FIG.
Using the sintering raw material charging apparatus shown in FIG. 2, the sintering raw material 2 shown in Table 2 above is cut out from the feed hopper 1 using the drum feeder 3, and is palletized through the sloping chute 4 and the magnet drum 6. The magnetized sintering raw material such as mill scale and ore return and the fine sintering raw material were segregated in the upper part of the sintering raw material layer 7. Permanent magnet at this time
The magnetic field strength of 11 was set to 2000 Gauss. Magnet drum 6
Was 400 mm in outer diameter.

In the sintering raw material charging method according to the present invention, the sintering raw material adhered to the surface of the magnet drum 6 was scraped off by the main scraper 8 and the four sub-scrapers 18.
In addition, the magnitude of the magnetic force of the permanent magnet 11 built in the magnet drum 6 is adjusted in accordance with the target amounts of the magnetized sintering raw material and the trickle raw material of the sintering raw material 2 deposited on the pallet 5, The rotation speed of the magnet drum 6 was adjusted as appropriate.
The sintering operation performance was evaluated by comparing the case where the magnet drum 6 provided with the permanent magnet according to the present invention was installed with the conventional case where only the plate type sloping chute was not installed as shown in FIG. As shown in FIG. 8, the evaluation items are three items of the production rate of the sinter, the yield, and the shutter strength which is the strength index of the sinter. However, in this case, the mixing ratio of coke breeze and quick lime was kept constant. From FIG. 8, it can be seen that when the method of the present invention is carried out, the shutter strength is increased and the production rate of sinter and the sintering yield are improved as compared with the case of carrying out the conventional method. As described above, the effect of the present invention is remarkable as compared with the conventional method, and not only the yield of sinter can be improved, but also the sintering operation basic unit can be improved.

Hereinafter, another embodiment of the present invention will be described with reference to the drawings. In the present invention, as shown in FIG. 9, a driven drum 13 is provided opposite to a cylindrical driving drum 6 having a built-in permanent magnet 11 or an electromagnet 12, and the magnet drum 6 and the driven drum 13 are endless. At the same time, the belt 17 is passed over and the endless belt is
The main scraper 8 is attached in contact with 17. In this case, the magnetized sintering raw material exhibiting ferromagnetism is magnetized by the sintering raw material 2 via the endless belt 17 on the rotatably driven magnet drum 6, and the fine-grained raw material having a slow falling speed is reduced in the same manner as described above. Segregate.

According to this configuration, the sintering raw material 2 does not directly adhere to the magnet drum 6 and the endless belt 17
The sintering material adhered to the pallet 5 is reliably removed by the main scraper 8 disposed on the driven drum 13 side, and can be collected on the pallet 5. In this case, a sub-scraper cannot be installed because the endless belt 17 needs to be stretched over the magnet drum 6.

In the sintering raw material charging apparatus shown in FIG. 10 according to the present invention, an auxiliary sloping chute 14 is provided in parallel with and separated from immediately below a commonly used sloping chute 4. Sintering chute 4 with two sintering raw materials 2 cut out
A case is shown in which 14 is switched and supplied to the magnet drum 6 incorporating the permanent magnet 11 or the electromagnet 12. In this case, the upper regular sloping chute 4 is movably installed diagonally upward as indicated by an arrow, and reciprocates between the operating position and the retreat position.

Usually, the upper sloping chute 4 is used. However, in order to remove the sintering material attached to the upper sloping chute 4 approximately once every 30 minutes, the sloping chute 4 is moved from the operating position to the retracted position. Then, the sintering raw material attached on the sloping chute 4 is removed using a scraper (not shown) separately provided. During this removal operation, the auxiliary sloping chute 14 installed on the lower side is used, but the sintering raw material 2 cut out from the drum feeder 3 moves to the magnet drum 6 via the lower auxiliary sloping chute 14. The falling locus of the sintering raw material 2 changes.

Therefore, the magnet drum 6 is installed so as to be able to move back and forth in the horizontal direction indicated by the arrow in FIG. 10 so as to follow the change of the falling trajectory. The drum 6 is moved to the left. Thereby, the condition of the sintering raw material 2 to be charged into the magnet drum 6 from the auxiliary sloping chute 14 installed on the lower side is adjusted so as not to be different from the case where the upper sloping chute 4 is used.

As a result, while maintaining the state of magnetization of the magnetized sintering raw material existing in the sintering raw material 2 with respect to the magnet drum 6 satisfactorily, the sintering raw material 2
Charging can be continued. When the work of removing the sintering raw material attached to the upper sloped chute 4 at the retreat position is completed, the work is immediately returned to the operating position, and at the same time, the magnet drum 6 is moved to the right side to return to the original position, thereby causing the upper sloped chute 4 to return to the original position. Magnetic drum 6 via chute 4
The state returns to the state in which the sintering raw material 2 is charged by the usual raw material falling trajectory. Thereby, it goes without saying that segregation of the sintering raw material 2 by the magnet drum 6 can be performed in the same manner as in the above-described case.

The sintering raw material charging apparatus shown in FIG. 11 according to the present invention has a thickness of 300 gauss on the lower back surface of the plate type sloping chute 4 in order to reduce the speed of the sintering raw material 2 sliding down on the sloping chute 4. An inexpensive rectangular permanent magnet 15 having a weak magnetic force of about 1 to 1000 Gauss is installed. Similarly, the magnet drum 6 containing the permanent magnet 11 or the electromagnet 12 is installed below the sloping chute 4. Length L of permanent magnet 15 = 30mm-10
0 mm, thickness D = 30 mm to 50 mm, magnetic force = 300 gauss to 1000 gauss, and this rectangular permanent magnet 15
^O. Using the Fe ₂ O ₃ based permanent magnet.

The price is, for example, 1/7 to 1/1 compared to the 3000 gauss permanent magnet 11 installed as the magnet drum 6.
10 and can be installed very cheaply. By changing the position of the rectangular permanent magnet 15 with respect to the sloping chute 4, the magnetic force exerted on the sintering raw material 2 sliding down on the sloping chute 4 is adjusted. It is conceivable to install an electromagnet here, but it is inappropriate to install the electromagnet in such a location where equipment is large and a narrow space is required.

A magnetic force is applied to the sintering raw material 2 cut from the feed hopper 1 using the drum feeder 3 and sliding down on the sloping chute 4 from a permanent magnet 15 installed on the lower back surface of the sloping chute 4. By doing
Sintering raw material 2 sliding down on the sloping chute 4
Slow down the falling speed. At this time, the magnetic force is adjusted by changing the position of the permanent magnet 15 in proportion to the falling speed at which the sintering raw material 2 slides down. That is, when the falling speed is high, the magnetic force of the permanent magnet 15 is increased, and when the falling speed is low, the magnetic force is reduced, and the sintering raw material 2 is decelerated by adjusting the magnetic force according to the falling speed.

The sintering raw material 2 moving from the tip of the sloping chute 4 to the magnet drum 6 has a reduced falling speed, so that the efficiency with which the magnetized sintering material is magnetized on the magnet drum 6 increases, and 2 is strengthened. Further, the sintering raw material 2 that has promoted segregation is softly thrown from the magnet drum 6 onto the pallet 5 at a reduced speed, so that the sintering raw material layer 7 deposited on the pallet 5 has a charging density of The air permeability is reduced and the sinterability is improved.

In the sintering raw material charging apparatus shown in FIG. 12 according to the present invention, the auxiliary magnet drum 16 is opposed to the front position (upstream side) of the magnet drum 6 installed below the plate type sloping chute 4. Shows what to install. The structure of the auxiliary magnet drum 16 is basically as shown in Fig. 2 (with built-in permanent magnet 11)
Or, it is the same as the magnet drum 6 shown in FIG. 3 (incorporating the electromagnet 12), for example, by omitting the non-rotating fixed inner ring 9 in FIG. 2 and close to the inner peripheral surface of the outer ring 10 as shown in FIG. A plurality of permanent magnets 11 are arranged. The range in which the permanent magnets 11 are arranged close to the inner peripheral surface of the outer ring 10 is defined as a wide range of 3/4 circumference from the upper end point A of the outer ring 11 to the right side, and the left side point B via the lower side, as a magnetic generation area. I have. Auxiliary magnet drum 16
, The rotation direction of the outer ring 10 is opposite to that of the magnet drum 6 as shown in the figure.

The sintering raw material 2 that falls between the magnet drum 6 and the auxiliary magnet drum 16 first magnetizes the magnetized sintering raw material by the magnetic force of the magnet drum 6. The magnetized sintering raw material that has failed to be magnetized by the magnet drum 6 is magnetized again by the magnetic force of the magnetic generation region formed by the auxiliary magnet drum 16, and segregation is performed to assist segregation of the magnetized sintering raw material. growing. As a result, when loaded on the pallet 5 from the magnet drum 6, the upper and lower segregation layers are inverted and deposited on the pallet 5, so that the binding material layer 7 is made of a magnetized sintered material and a thin material having a slow falling speed. It is possible to further increase the sintering strength of the upper layer portion 7A containing more granular material.

The sintering raw material charging apparatus shown in FIG. 14 according to the present invention comprises a first-stage magnet drum 6A installed below an upstream sloping chute 4A and a downstream sloping chute.
4B and the second-stage magnet drum 6B installed below
This shows a case of tier arrangement. Each magnet drum
The structure itself of 6A and 6B is as shown in FIG.
3 is the same as that shown in FIG. 3, and will not be described repeatedly. However, each has a main scraper 8, and a sub-scraper 18 is provided as necessary. In this case, the apparatus can be suitably used under equipment conditions where a large drop from the drum feeder 3 to the pallet 5 can be obtained, and three or more stages can be used.

The sintering raw material 2 cut out from the feed hopper 1 through the drum feeder 3 is first subjected to a particle size segregation effect by percolation when sliding down on the first-stage sloping chute 4A, and the coarse particles having a large particle size are formed in the middle part. The particles move to the magnet drum 6A in a state in which a fine stream having a small particle size segregates in the lower part. As shown in FIG. 15, among the sintering raw materials 2, the magnetized sintering raw material is magnetized on the outer ring 10 by the magnetic force of the permanent magnet 11 provided in the magnet drum 6A, and promotes segregation and then moves to the sloping chute 4B. I do.

Next, the sintering raw material 2 sliding down the sloping chute 4B is again promoted to segregate the particle size by percolation, and then moved to the second-stage magnet drum 6B to segregate the magnetized sintering raw material. It is loaded on the pallet 5 in a promoted state. According to this configuration, the segregation of the sintering raw material 2 is repeated twice, so that the segregation is further increased. Therefore, segregation of the magnetized sintering raw material and the fine-grained raw material having a slow falling speed to the upper layer portion 7A of the sintering raw material layer 7 can be further strengthened, and the sinterability is improved.

By the way, instead of the sloping chute, a belt conveyor type sloping chute is installed at an angle, and the belt conveyor type sloping chute is rotated in a direction opposite to the sliding direction of the sintering raw material to reduce the sliding speed of the sintering raw material. A method is known in which the pallet is charged on a pallet while slowing down the particle size by segregation by percolation. Therefore, in the present invention, a belt conveyor-type sloping chute 20 capable of normal rotation and reverse rotation is installed at a predetermined inclination angle below the drum feeder 3 as in the sintering raw material charging apparatus shown in FIG. The belt conveyor type sloping chute 20 has a magnet drum 6 containing a permanent magnet 11 or an electromagnet 12 on its driving side, and a driven drum 13 obliquely above and opposed to the magnet drum 6. Then, the endless belt 19 is stretched between the magnet drum 6 and the driven drum 13, and the main scraper 8 is attached to the end of the endless belt 19 at the position of the magnet drum 6.

The structure of the magnet drum 6 is basically the same as that shown in FIG. 2 (with the built-in permanent magnet 11) and FIG. 3 (with the built-in electromagnet 12), but as shown in FIG.
The sub-scraper is not attached because the endless belt 19 is hung on the belt. The direction of rotation of the magnet drum 6 is free to rotate forward and backward so as to adjust the speed of the sintering raw material 2 that slides down on the endless belt 19 as shown by arrows in the figure. If the rotation direction of the magnet drum 6 is the same as the sliding direction of the sintering raw material 2, the falling speed of the sintering raw material 2 can be increased, and if the rotating direction is reversed, the falling speed can be reduced. Then, the rotation direction and the rotation speed are adjusted to be optimum.

In this case, the sintering raw material 2 cut from the feed hopper 1 is supplied to a belt conveyor type sloping chute.
Due to the particle segregation effect of percolation when sliding down on the endless belt 19 of the endless belt 19, the endless belt
The sintering raw material 2 on the top 19 moves to the portion of the magnet drum 6 with fine grains segregated in the lower layer and coarse grains segregated in the upper and middle layers. Here, the magnetized sintering raw material of the sintering raw material 2 is magnetized via the endless belt 19 to the outer ring 10 in the magnetic generation region formed by the permanent magnet 11 built in the magnet drum 6 as shown in FIG. In the same manner as described above, the magnetized sintering raw material and the fine-grained raw material having a slow falling speed segregate in the upper layer portion 7A of the sintering raw material layer 7 deposited on the pallet 5, and exert the same action and effect as in the above case. I do. Here, the sintering raw material adhered to the endless belt 19 is removed by the main scraper 8 arranged on the return side of the magnet drum 6, and falls onto the sintering raw material layer 7 deposited on the pallet 5.

On the other hand, a drum chute is provided in place of the plate-type sloping chute, and this drum chute is rotated in the same direction as the sintering raw material dropping direction to rotate the sintering raw material 2.
There is known a method of charging a pallet on a pallet. Therefore, in the present invention, a magnet drum 21 having a role of a drum chute is installed below the drum feeder 3 as in a sintering raw material charging apparatus shown in FIG. And a sub-scraper 18 as necessary. The structure of the magnet drum 21 is basically the same as that shown in FIG. 2 (permanent magnet) and FIG. 3 (electromagnet).
For example, as shown in FIG. 19, a permanent magnet 11 is disposed near the inner peripheral surface of the outer ring 10 to form a magnetic generation region.

In this case, the sintering raw material 2 cut out from the feed hopper 1 using the drum feeder 3 is
After falling , the magnetized sintering raw material of the sintering raw material 2 is magnetized on the outer ring 10 in the magnetism generating region by the permanent magnet 11 built in the magnet drum 21, and the magnetized sintering raw material and the fine granules having a slow falling speed are formed in the lower part. Sintering raw material is segregated, and coarse sintering raw material segregates in the middle layer. At this time, by adjusting the rotation speed or magnetic force of the magnet drum 21, the magnetized sintering raw material and the fine-grained raw material segregated to the lower layer side during the charging of the sintering raw material 2 can be adjusted to target amounts.

The sintering raw material 2 thus segregated
Is charged from the magnet drum 21 onto the pallet 5
Since the upper and lower raw material layers are inverted, the sintering raw material layer 7 deposited on the pallet 5 has a large amount of magnetized sintering raw material and fine-grained raw material in the upper layer portion 7A, and weak or non-magnetic in the middle and lower layer portions 7B. magnetic sintered material and coarse material is in a state of being segregated. as a result,
The sinterability of the upper layer portion 7A of the sintering raw material layer 7 can be improved as in the case described above.

In the sintering raw material charging apparatus shown in FIG. 20 according to the present invention, a plurality of rectangular permanent magnets 22 are provided on the back side of the plate type sloping chute 4 along the sliding direction of the sintering raw material 2. It shows an arrangement in series. Permanent magnet 22
Is a rectangular parallelepiped, and adjusts its magnetic force according to the position of the sintering raw material 2 sliding down on the sloping chute 4.
For example, four permanent magnets 22 having a magnetic force of 200, 300, 500, and 800 Gauss are arranged in series from the upper side to the lower side along the back surface of the sloping chute 4 to increase the magnetic field strength downward.

In this case, when the magnetized sintering raw material of the sintering raw material 2 cut out from the ore feeding hopper 1 slides down on the sloping chute 4, the magnetic force of the four permanent magnets 22 having different magnetic forces acts sequentially. It is magnetized, moves to the lower layer side, and fine grains segregate to the lower layer side due to the segregation effect of percolation of the sintering raw material 2. Also, 1500 gauss is sufficient for the lowermost permanent magnet for magnetization. And
On the sintering raw material 2 sliding down on the sloping chute 4, weak or non-magnetic sintering material or coarse-grained sintering material segregates in the middle layer. Further sloping shoot 4
When the sintering raw material 2 is directly charged onto the pallet 5 from
Since the upper and lower layers are reversed, the magnetized sintering raw material and fine-grained raw material segregate in the upper layer portion 7A of the sintering raw material layer 7 deposited on the pallet 5, and the middle or lower layer portion 7B has a weak or non-magnetic material. Sintering raw materials and coarse sintering raw materials segregate. The operational effects are the same as those described in the above embodiment.

Incidentally, the bulk density of the sintering raw material layer 7 loaded on the pallet 5 has a large effect on the production rate. For example, the bulk density of the sintering raw The relationship as shown in FIG. 21 is obtained with the production rate of the ore, indicating that decreasing the bulk density of the sintering raw material layer improves the production rate of the sintered ore. When the sintering raw material 2 is directly loaded onto the pallet 5 from the lower end of the sloping chute 4 without applying a magnetic force as in the conventional sintering raw material apparatus shown in FIG. Since it is about 1.9, if the sintering raw material 2 is loaded on the pallet 5 by lowering the bulk density of the sintering raw material layer 7 than this, the production rate of the sinter may be improved. The relationship between the falling speed on the pallet 5 and the bulk density of the sintering raw material 2 is as shown in FIG. 22, and as the falling speed of the sintering raw material 2 is reduced, the bulk density of the sintering raw material 2 is reduced. Can be reduced.

When a magnetic force is exerted by a plurality of permanent magnets 22 arranged on the back side of the plate type sloping chute 4, the falling speed of the magnetized sintering raw material in the sintering raw material can be reduced. Then, the magnetization characteristics of the sintering raw material were measured using a vibrating sample magnetometer. The relationship between the strength of the magnetic force (gause) and the strength of the magnetization (emu / g) created based on the measurement results is shown in FIG.
See Figure 23. As shown in FIG. 23, among the sintering raw materials, iron ore, which is a raw material for iron, has zero magnetization strength, but the ore and the mill scale are blended to account for 20 to 30% of the sintering raw material. It can be seen that is a magnetized sintering material having a large magnetization strength and being very easily magnetized by a magnet.

The Japanese Patent Application Laid-Open No. 58-133333 also states that when a magnetic force is applied to the sintering raw material in the process of charging the pallet, the falling speed of the sintering raw material is weakened and the sintering raw material can be softly charged. Therefore, in order to confirm that the falling speed of the sintering raw material was reduced by applying a magnetic force, a loading experiment was performed using a PVC loading apparatus shown in FIG. 24. The mixing ratio of the used sintering raw materials is shown in Table 3, where the return of the magnetized sintering raw materials is 15% and the mill scale is 4.25%. The experiment was performed by moving the positions of the permanent magnets 22 vertically arranged along the lower back surface of the vinyl chloride sloping chute 4 vertically to the back surface of the chute, thereby reducing the magnetic force on the chute surface to 0 gauss, 500 gauss, and 900 gauss. Changed to Gaussian. Opening / closing the damper 23 from the mining hopper 1 supplies the sintering raw material to the sloping chute 4 and shoots the situation where the sintering raw material falls from the lower end of the chute at a video shooting location A using a high-speed video every 1/1000 second. Then, the falling speed of the sintering raw material was measured.

[0074]

[Table 3]

FIG. 25 shows the relationship between the magnetic flux density (Gauss) indicating the magnitude of the magnetic force on the chute surface and the falling speed (m / sec.) Of the sintering raw material obtained by the measurement. From FIG. 25, it was confirmed that as the magnetic flux density was increased from 0 Gauss to 900 Gauss, the falling speed of the sintering raw material was reduced from 1.6 m / sec. To 1.2 m / sec. When observing the situation of dropping from the lower end of the sloping chute 4 at this time, when 900 gauss of magnetic force is applied from the permanent magnet 22 (FIG. 26A), no magnetic force is applied from the permanent magnet 22 (FIG. 26 (A)). B) It was observed that the falling flow of the sintering material spread vertically as compared to). This suggests that when a magnetic force is applied, the falling sintering raw material is softly charged.

Next, in order to investigate the effect of magnetic force on the productivity of the sinter, the sintering raw material charging apparatus shown in FIG. 20 was used.
Experiment No. 1 in which four permanent magnets 22 vertically arranged along the back side of a stainless steel (SUS304) sloping chute 4 were moved away from the rear to apply no magnetic force to the chute surface.
In the case of the experiment No. 2 in which the same magnetic force was applied, and in the case of Experiment No. 3 in which the magnetic force in the height direction was changed. Table 4 shows the experimental levels at this time.

[0077]

[Table 4]

At this time, the permanent magnet 22 placed at the upper end of the slowing chute 4 where the sintering raw material 2 falls slowly
When a magnetic force exceeding 0 Gauss was applied, the magnetized sintering raw material was stagnated by the magnetic force and stopped flowing, so the magnetic flux density at the top of the chute was set to 700 Gauss. The experiment N in Table 2
In o.2, the magnetic flux density at each position in the chute height direction is 700
In Experiment No. 3, the magnetic flux density at the top of the chute was increased downward to 900, 1100, and 1300 gauss in accordance with the increase in the falling velocity in Gaussian. The results obtained at each experimental level were compared with the bulk density (t
on / m ³ ) and sinter production rate (ton / hrm ² )
Shown in

A comparison between Experiment No. 1 and Experiment No. 2 shows that when a magnetic force is applied to the sintering raw material, the bulk density decreases by 0.05 ton / m ³ and the production rate decreases by 0.05 to It was found that ton / hr / m ^{2 was} improved. Furthermore, comparing Experiment No. 2 with Experiment No. 3, the bulk density is reduced by 0.15 ton / m ³ by setting the magnetic flux density higher as going downward in the height direction on the sloped chute 4, Production rate is 0.15ton / hr
it was confirmed that the m ² improved. As described above, according to the sintering raw material charging apparatus shown in FIG. 20, the magnetized sintering raw material and the fine-grained raw material having a slow falling speed are segregated in the upper part of the sintering raw material layer 7 formed on the pallet 5. In addition to this, the effect of reducing the bulk density of the sintering raw material layer 7 is obtained.

When the embodiment of the present invention described with reference to FIGS. 1 to 8 and FIGS.
Since a magnetic force acts on the sintering raw material during the charging process onto the pallet, there is a difference in the effect, but the effect of reducing the bulk density of the sintering raw material layer can be obtained.

[0081]

As described above, according to the present invention, the DL
When loading the sintering raw material cut out using the drum feeder from the feeder hopper provided in the charging device of the sintering machine on a pallet, a permanent magnet or a magnet drum with a built-in electromagnet or a square permanent magnet is used. By applying a magnetic force, the magnetized sintering material such as ferromagnetic mill scale and remineralization existing in the sintering material is magnetized to the lower side of the sintering material, and the fine-grained material with a slow falling speed is formed in the lower layer. Part, and a lower magnetic material, a non-magnetic material, and a coarse material are segregated in the upper and middle layers.

The upper and lower layers of the sintering material layer deposited on the pallet are ferromagnetic and have good sintering properties due to the reversal of the sintering material when the sintering material is loaded on the pallet. It is possible to segregate a large amount of the sintering raw material and the fine-grained raw material having a slow falling speed, and to segregate a raw material having a low sinterability and a weak magnetic property, a non-magnetic raw material and a coarse-grained raw material in the middle and lower layers. Further, the effect of reducing the bulk density of the sintering raw material layer can also be obtained.

For this reason, the sintered ore sintered on the pallet is improved in the sintering strength of the upper layer, and while the sintering strength is originally high, together with the lower layer, the overall strength of the sintered ore is improved. Can be planned. As a result, according to the present invention, there is no need for extensive equipment remodeling of the sintering raw material charging apparatus, and without increasing the amount of auxiliary raw material or carbon source to the sintering raw material,
The improvement of the production rate and the yield of the ore by the DL sintering machine is achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a sintering raw material charging apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view showing a magnet drum incorporating a permanent magnet according to the present invention.

FIG. 3 is a longitudinal sectional view showing a magnet drum incorporating an electromagnet according to the present invention.

FIG. 4 is a partial cross-sectional view showing a state in which a ferromagnetic material is magnetized on a magnet drum containing a permanent magnet according to the present invention.

FIG. 5 is a line graph showing the relationship between the height from the great bar (mm) and the content of the mill scale (%) by comparing the present invention example with the conventional example.

FIG. 6 is a line graph showing the relationship between the height (mm) from the great bar and the ore return content (%) by comparing the present invention example and the conventional example.

FIG. 7 is a line graph showing the relationship between the height (mm) from the great bar and the arithmetic mean diameter (mm) of the sintering raw material by comparing the present invention example and the conventional example.

FIG. 8: Sinter production rate (t / h · m ² ), yield (%)
5 is a bar graph showing shutter intensity (%) in comparison between the present invention example and the conventional example.

FIG. 9 is a side view showing an embodiment in which an endless belt is stretched over a driving-side magnet drum and a driven-side drum according to the present invention.

FIG. 10 is a vertical cross-sectional view showing an embodiment in which an auxiliary sloping chute is installed in parallel with a space immediately below a commonly used sloping chute according to the present invention, and a magnetic drum is installed movably back and forth below the auxiliary sloping chute.

FIG. 11 is a longitudinal sectional view showing an embodiment in which a rectangular permanent magnet is installed on the lower back surface of the lowering chute according to the present invention, and a magnet drum is installed below the permanent magnet.

FIG. 12 is a longitudinal sectional view showing an embodiment in which an auxiliary magnet drum is installed so as to face a magnet drum installed below a sloping chute according to the present invention.

13 is a longitudinal sectional view showing the auxiliary magnet drum of FIG. 12 according to the present invention.

FIG. 14 is a longitudinal sectional view showing an embodiment in which a first-stage magnet drum is installed below an upstream-side sloping chute and a second-stage magnet drum is installed below a downstream-side sloping chute according to the present invention. is there.

FIG. 15 is a longitudinal sectional view showing the magnet drum of FIG. 14 according to the present invention.

FIG. 16 is a longitudinal sectional view showing an embodiment in which a belt conveyor-type sloping chute having an endless belt stretched between a driving-side magnet drum and a driven-side drum is installed below a drum feeder according to the present invention. .

17 is a vertical sectional view showing the magnet drum of FIG. 16 according to the present invention.

FIG. 18 is a longitudinal sectional view showing an embodiment in which a magnet drum is installed below a drum feeder according to the present invention.

19 is a longitudinal sectional view showing the magnet drum of FIG. 18 according to the present invention.

FIG. 20 is a longitudinal sectional view showing an embodiment in which a plurality of rectangular permanent magnets are installed vertically on the back side of the sloping chute according to the present invention.

FIG. 21 is a graph showing the relationship between the bulk density (ton / m ³ ) of a sintering raw material layer and the production rate of sinter (ton / hr · m ² ).

FIG. 22 is a graph showing a relationship between a falling speed (m / sec.) Of a sintering raw material and a bulk density (ton / m ³ ) of a sintering raw material layer.

FIG. 23 is a graph showing the relationship between the magnetic strength (Gauss) of a permanent magnet and the magnetization strength (emu / g) of a sintering raw material.

FIG. 24 is a longitudinal sectional view showing a lab loading device made of PVC.

FIG. 25 shows the magnetic flux density (Gau
3 is a graph showing the relationship between ss) and the falling speed (m / sec.) of the sintering raw material.

FIG. 26 shows the drop of the sintering raw material in the case of applying a magnetic force of 900 gauss to the permanent magnet disposed on the lower surface side of the lower end portion of the sloping chute (A) and in the case of not applying the magnetic force to the permanent magnet (B). It is explanatory drawing shown in comparison.

FIG. 27 shows an experiment No. 1 in which no magnetic force is applied to four permanent magnets arranged on the back side of the sloping chute, and an experiment No. 2 in which the magnetic force applied to each permanent magnet is constant. The bulk density (ton / m ² ) of the sintering raw material layer and the production rate of sinter (t
4 is a bar graph showing on / hr · m ² ) in comparison.

FIG. 28 is a longitudinal sectional view showing a sintering raw material apparatus according to a conventional example.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Mining hopper 2 Sintering raw material 3 Drum feeder 4 Sloping chute 5 Pallet 6 Magnet drum 7 Sintering raw material layer 8 Main scraper 9 Inner ring 10 Outer ring 11 Permanent magnet 12 Electromagnet 13 Follower drum 14 Auxiliary sloping chute 15 Permanent magnet 16 Auxiliary magnet Drum 17 Endless belt 18 Sub-scraper 19 Endless belt 20 Belt conveyor type sloping chute 21 Magnet drum 22 Permanent magnet 23 Damper

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norifumi Fujii 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. Chome (without address) Kawasaki Steel Corporation Mizushima Works (72) Inventor Rikio Ono 1-chome, Mizushima Kawasaki-dori, Kurashiki City, Okayama Prefecture Kawasaki Steel Corporation Mizushima Works (72) Inventor Takahiro Kumeda Okayama 1-chome, Kawasaki-dori, Mizushima, Kurashiki-shi, Japan (without address) Inside the Mizushima Works, Kawasaki Steel Corporation (56) References JP-A-8-53719 (JP, A) JP-A-58-133333 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C22B 1/00-61/00 F27B 21/00-21/14

Claims (13)

(57) [Claims] 1. A method for charging a sintering raw material in which a sintering raw material is cut out from a feed hopper using a drum feeder, and is loaded on a pallet of a Dwyroid type sintering machine to form a sintering raw material layer. before you cut with the drum feeder
Serial sintered feedstock slide down on sloping chute of the plate, when it is charged from the tip to the pallet, the flow of the sintered material by a cylindrical magnet drum disposed below the sloping chute is reacted with a magnetic force, the magnetizability sintered material Rutotomoni is magnetized to the magnet drum attracts the lower layer side of the sintering raw material by magnetic force, slow fines material with falling velocity on the lower layer side of the sintered material is segregated, by the upper and lower layers reversal of the sintered material when charged onto the pallet through the magnet drum, the magnetizability sintered material in the upper portion of the sintering material layer formed on the pallet and A method for charging a sintering raw material using magnetic force, wherein a large amount of the fine-grained raw material having a slow falling speed is segregated. Wherein sintering of the sintered material adhering to the magnet drum, using a magnetic force according to claim 1, wherein the scraping on the magnet drum by contacting the scraper and collecting on the pallet How to charge raw materials. Wherein said magnetic drum that is located below the sloping chute of the plate type, with passing over the endless belt between the drum opposed to the magnet drum, abuts on the surface of the endless belt before disposed a scraper, attached to the endless belt
Charging method of sintering material using a magnetic force according to claim 1, wherein the serial sintering raw material as a drop off by the scraper and collecting on the path <br/> cmdlet. 4. A well as installing an auxiliary sloping chute parallel plate-type spaced immediately below the sloping chute of the plate type for customary evacuation of the Ro <br/> over pings chute commonly from its operating position in the obliquely upward while installing reciprocally moved to a position, the sloping Shi
Placed forward and backward freely to the magnet drum that is installed below the chute in a horizontal direction, to move from running the sloping chute commonly positioned obliquely above the retracted position, removing the sintered material adhering thereto work during the time of loading the sintered material through the auxiliary <br/> aid sloping chute bottom, Ru is moving the magnetic <br/> stones drum under side of the auxiliary sloping chute it allows the auxiliary sloping from the chute of the sintering raw material the sintering raw material using magnetic force according to claim 1, 2 or 3, wherein the adjusted to fall trajectory to move does not change the magnetic drum How to charge. 5. The permanent magnet is placed at the bottom rear surface of the sloping chute of the plate type, by acting a magnetic force from the permanent magnet in the sintering raw material sliding down on the sloping chute, the magnet drum from the sloping chute 5. The method of charging a sintering raw material using a magnetic force according to claim 1, wherein the falling speed of the sintering raw material moving to the sintering material is reduced. 6. established the opposite to the auxiliary magnet drum on the upstream side of the magnet drum that is installed below the sloping chute of the plate type, the sintered material falling between the auxiliary magnetic drum and the magnetic drum a magnetic force according to claim 1, 2, 3, 4 or 5, wherein the magnetizable sintered material fails to magnetized to the magnet drum, and characterized in that magnetized by magnetic force from said auxiliary magnet drum of How to charge the used sintering raw materials. 7. A first-stage magnet drum installed below an upper plate-type sloping chute and a second-stage magnet drum installed below a lower plate-type sloping chute are installed in two stages in series. and, the magnetizability sintered material slide down the upper sloping chute above is magnetized by magnetic force from the magnet drum of the first stage and subsequently slide down the lower sloping chute above
Claim 1, characterized in that magnetized by magnetic action of the magnetizability sintered material from the magnet drum of the second stage,
A method for charging a sintering raw material using the magnetic force described in 2, 3, 4, 5, or 6. 8. A method for charging a sintering raw material in which a sintering raw material is cut out from a mining hopper using a drum feeder and charged on a pallet of a Dwyroid type sintering machine to form a sintering raw material layer. before you cut with the drum feeder
Wear serial sintering raw material, while the driving side slide down on the belt conveyor type sloping chute arranged driven drum obliquely upward while placing the magnet drum, by its magnetic action while forward or reverse the magnet drum after segregated on the lower side slow with fine material of the falling speed is magnetized magnetic sintered material, sintered using a magnetic force, characterized in that directly loaded onto the pallet from the belt conveyor type sloping chute How to charge raw materials. 9. A method for charging a sintering raw material in which a sintering raw material is cut out from a mining hopper using a drum feeder and charged on a pallet of a Dwyroid type sintering machine to form a sintering raw material layer. A magnetic drum below the drum feeder
Installed, the said sintered material was cut out using a drum feeder is dropped on said magnetic drum, the magnetic force by the action of the magnetic drum that rotates in the same direction as the falling direction of the sintered material of the sintered material After magnetizing the magnetized sintering raw material and segregating it in the lower layer together with the fine-grained raw material with a slow falling speed,
Before the time of entering instrumentation to said pallet from said magnet drum
Formed on the pallet by reversing the upper and lower layers of the sintering material
The magnetized sintering raw material and
A method of charging a sintering raw material using magnetic force, wherein a large amount of the fine-grained raw material having a low falling speed is segregated . 10. adjust the size and / or rotational speed of the magnetic force of the magnet drum in accordance with the target amount of the magnetizability sintered material segregated in the upper portion of the sintering material layer being dumped on the pallet Claims 1, 2, 3, 4,
A method for charging a sintering raw material using the magnetic force described in 5, 6, 7, 8 or 9. 11. A method for charging a sintering raw material in which a sintering raw material is cut out from a mining hopper using a drum feeder and charged on a pallet of a Dwyroid type sintering machine to form a sintering raw material layer. It was cut by using the drum feeder
The sintering raw material is placed on a plate-type sloping chute.
A plurality of permanent magnets are arranged in series in the sliding direction along the back side of the portion where
So that the magnitude of the magnetic force increases as
While sliding down said plate-type sloping chute above arranged in, after being segregated on the lower side with magnetizability sintering raw material magnetized not fall slower fine raw material by magnetic force from said permanent magnet, said sloping From the shoot
Charging method of sintering material using a magnetic force, characterized in that directly loaded onto the pallet. 12. A characterized by adjusting the magnitude of the magnetic force of the permanent magnet in accordance with the target amount of the magnetizability sintered material segregated in the upper portion of the sintering material layer being dumped on the pallet 12. The method for charging a sintering raw material using a magnetic force according to claim 11. 13. A sintering raw material charged on the pallet.
Acts on the magnetized sintering raw material according to the target value of the bulk density of the layer
Charging method of sintering material using a magnetic force according to claim 11, wherein the adjusting the size of the magnetic force of the permanent magnet to be.