JP5853874B2 - Method for producing sintered ore with high combustible carbon material mixed in the upper layer of the sintered layer - Google Patents

Description

  The present invention relates to a method for producing a sintered ore in which a highly combustible carbon material is blended in the upper layer of a sintered layer.

  Production of sintered ore using a lower suction type sintering machine at a steelworks is performed as follows. Sintered raw materials are iron-containing materials such as iron ore as the main raw material and iron-making dust generated in the iron-making process, auxiliary materials such as limestone and serpentine required for the sintering reaction, and carbon materials such as coke powder as a heat source And is formed.

Sintering raw materials are mixed and granulated while adding water using a mixing and granulating machine such as a drum mixer before being charged into the lower suction type sintering machine. A pseudo particle composed of particles and adhering powder having a particle diameter of 0.5 mm or less adhering to the periphery thereof is used.
By this, after charging into the sintering machine, maintain the air permeability in the raw material packed layer formed in the sintering pallet, promote the sintering reaction of the sintering raw material, and ensure high productivity Can do.

The pseudo-particle-formed sintered raw material is charged into a sintering pallet at a feeding section of a sintering machine to form a raw material packed layer. Thereafter, in the ignition furnace, the coke powder on the surface thereof is ignited and air is sucked into the lower layer of the sintering machine to move the combustion point of the coke powder downward.

The sintering reaction proceeds in sequence from the upper layer to the lower layer of the raw material packed bed by the combustion heat, and the sintering is completed by the time the sintering pallet moves and reaches the waste ore section. The sintered cake (lumps) in the sintering pallet is discharged from the waste ore section and then crushed to produce a sintered ore for a blast furnace with a predetermined particle size. Sintered ore powder having a particle size smaller than a predetermined particle size as a blast furnace sinter generated in the production of sinter is blended in a sintering raw material as a return ore and sintered again.

  For a blast furnace at a steelworks that manufactures a large amount of pig iron, it is important to improve the productivity of the sintering machine, the quality of the sintering, and the yield of the sintered product.

As a means for improving the productivity of the sintering machine, a technique for improving the combustibility of the sintering fuel has been tried.
As a technique for improving the combustibility of the sintering fuel, there is a post-addition technique of powder coke. In the first stage, iron ore, secondary raw materials, limestone secondary raw materials are mixed and granulated to produce pseudo-particle raw materials, and then, in the second stage, powder coke is added to the pseudo-particle raw materials, Granulate to produce the final pseudoparticle raw material. Since the powder coke is attached to the surface of the pseudo particles produced in the second stage and is not buried in the pseudo particles, the combustibility of the powder coke is improved.

  As a technique for improving the combustibility of the sintering fuel, there is a technique in which char obtained by thermally decomposing lignite, subbituminous coal, or highly volatile bituminous coal by heating is used as the sintering fuel.

As a pseudo-particle raw material for sintering for producing sintered ore for blast furnace, it has a first layer whose core is coarse iron ore with an average particle size of 2 mm or more, and covers the outer surface of the first layer In addition to the second layer to which the fine iron ore with an average particle size of less than 2 mm and no SiO ₂ -containing material is attached, the limestone-based powder raw material and the carbonaceous powder-based raw material are not attached. An invention related to a pseudo-particle raw material for sintering, characterized in that a limestone powder raw material and a carbonaceous powder raw material are adhered (Patent Document 1).

  In addition, the sintering raw material excluding the powder coke is once put into a drum mixer, granulated for a predetermined time, and then only the powder coke is added, and the granulation operation is performed again. There is a disclosure of a knot test (Non-Patent Document 1).

  In addition, there is a disclosure relating to a sintering test using a highly combustible coal char produced by heating brown coal, subbituminous coal or highly volatile bituminous coal in a circulating fluidized bed heating furnace to a temperature of 600 ° C. to 900 ° C. (Patent Document) 2).

  In addition, there is a disclosure relating to a sintering test using charcoal having higher combustibility than coal char (Non-Patent Document 2).

JP 2010-254929 A International Publication No. 01/092588

Iron and steel vol. 50 (2004) No. 8 ISIJ International, vol. 49 (2009) No. 49. 2, PP, 195-202

According to the description of Patent Literature 1, the sinter productivity, the reducibility of sintered ore, and the shutter strength are improved by attaching the limestone powder raw material and the carbonaceous powder raw material to the surface of the pseudo particle raw material. There is. However, there is no description about the yield of sintered ore products.
According to the description of Non-Patent Document 1, there is a description of a decrease in product yield of sintered ore in addition to an improvement in sintering productivity due to post-addition of powder coke.
According to the description of Patent Document 2, if the ratio of use of the coagulation material in the blended raw material is constant, the higher the combustion rate of the coagulation material and the higher the combustion temperature, the shorter the completion time of the coagulation material combustion and The yield is improved and the productivity of sintered ore is improved (paragraph “0009”).
According to the description of Non-Patent Document 2, the use of charcoal with high combustibility improves the sintering productivity, but decreases the strength of the sintered ore.

  According to the above-mentioned patent documents and non-patent documents, if the combustion property of the sintering fuel is increased, the sintering productivity is improved, but the product yield of the sintered ore is improved but there is a description that it is lowered. Yes, not sure. This is considered to be because the sintering strength and the yield of sintered ore products are affected by the conditions of the sintering operation.

  An object of the present invention is to provide an operation capable of improving sintering productivity and improving the yield of sintered ore products. Therefore, it is providing the manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer.

The inventor of the present invention introduces a solid fuel with improved combustibility only in the upper layer of the sintered packed bed,
In addition to improving the sintering productivity, it was found that the yield of sintered ore products can be improved.
The present invention has been made based on the above findings, and the gist of the invention is as follows.
(1) The blended raw material is packed in two layers on the pallet of a Dwytroid-type sintering machine, and the carbonaceous material contained in the blended raw material is burned while sucking air downwards, and the blended raw material is heated by the combustion heat. A method for producing sintered ore by sintering,
In the lower layer of the packed bed on the pallet, iron ore, auxiliary raw material, limestone auxiliary raw material and charcoal material are mixed and filled with pseudo-particle raw material produced by granulation,
The upper layer of the packed bed on the pallet is filled with a pseudo-particle material that makes the charcoal material more combustible than the carbon material of the lower layer of the packed bed. It is a method for producing ore ,
The quasi-particle raw material of the upper layer of the packed bed in which the carbon material is more combustible than the carbon material of the lower layer of packed bed
Mixing and granulating iron ore, auxiliary raw material, limestone-based auxiliary raw material to produce a pseudo particle raw material, and adding the carbonaceous material to the pseudo particle raw material produced in the above step and granulating the raw material,
A method for producing a sintered ore in which a high-combustibility carbonaceous material is blended in the upper layer of a sintered layer, which is a pseudo-particle raw material produced by practice.
(2) the carbonaceous material of the filling layer upper to be used in the quasi-particle raw material high combustibility than filling layer underlying carbonaceous material said carbonaceous material is sintered according to characterized in that it is a coke breeze (1) The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the layer.
(3) The ratio of the upper layer thickness of the filler layer filled with the pseudoparticle raw material that makes the carbon material more combustible than the carbon material in the lower layer of the packed layer is 10% or more and 50% or less. The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer as described in (2) characterized by these.
(4) The carbon material in the upper layer of the packed bed used for the pseudo-particle raw material in which the carbon material is more combustible than the carbon material in the lower layer of the packed bed is heated by heating at least one of lignite, subbituminous coal, or highly volatile bituminous coal. It is char obtained by carrying out a decomposition process, The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer as described in (1) characterized by the above-mentioned.
(5) The ratio of the upper layer thickness of the packed layer filling the pseudo-particle raw material having a higher flammability than the carbon material of the lower layer of the packed layer to the total thickness of the packed layer is 10% or more and 30% or less. ( 4 ) The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer as described in ( 4 ) characterized by these.
(6) The carbon material filling layer underlying carbonaceous material from the high flammability and the pseudo particles raw material packed layer upper layer of the carbonaceous material used is lignite, and heating at least one of sub-bituminous coal or highly volatile bituminous coal thermal The method for producing a sintered ore comprising a mixture of a highly combustible carbon material in the upper layer of the sintered layer according to ( 1 ), wherein char and powder coke obtained by the decomposition treatment are mixed.
(7) The ratio of the filling layer upper layer layer thickness filled with the pseudoparticle raw material having a carbon material having higher combustibility than the carbon material in the lower layer of the packed bed to the total thickness of the packed bed is 10% or more and 50% or less. The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer as described in ( 6 ) characterized by these.
(8) The blended raw material is filled in two layers on the pallet of the Dwytroid-type sintering machine, the carbonaceous material contained in the blended raw material is burned while sucking air downward, and the blended raw material is heated by the combustion heat. A method for producing sintered ore by sintering,
In the lower layer of the packed bed on the pallet, iron ore, auxiliary raw material, limestone auxiliary raw material and charcoal material are mixed and filled with pseudo-particle raw material produced by granulation,
The upper layer of the packed bed on the pallet is filled with a pseudo particle raw material that makes the charcoal material more combustible than the charcoal of the lower layer of the packed bed,
The pseudo-particle raw material that makes the carbon material more combustible than the carbon material in the lower layer of the packed bed,
Iron ore, auxiliary materials and limestone auxiliary materials;
Upper layer of sintered layer characterized by being a pseudo-particle raw material produced by mixing and granulating char obtained by heating and pyrolyzing at least one of lignite, sub-bituminous coal or highly volatile bituminous coal The manufacturing method of the sintered ore which mix | blended highly combustible carbonaceous material with.
(9) The ratio of the thickness of the upper part of the packed layer filling the pseudoparticle raw material, which is higher combustibility than the carbon material of the lower layer of the packed bed, to the total thickness of the packed bed is 10% or more and 40% or less. The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer as described in ( 8 ) characterized by these.
(10) The raw material is filled in two layers on the pallet of the Dwytroid-type sintering machine, and the carbonaceous material contained in the raw material is burned while sucking air downward, and the raw material is mixed with the combustion heat. A method for producing sintered ore by sintering,
In the lower layer of the packed bed on the pallet, iron ore, auxiliary raw material, limestone auxiliary raw material and charcoal material are mixed and filled with pseudo-particle raw material produced by granulation,
The upper layer of the packed bed on the pallet is filled with a pseudo particle raw material that makes the charcoal material more combustible than the charcoal of the lower layer of the packed bed,
The pseudo-particle raw material that makes the carbon material more combustible than the carbon material in the lower layer of the packed bed,
A mixture of char and powdered coke obtained by heating and pyrolyzing at least one of lignite, subbituminous coal, or highly volatile bituminous coal, and iron ore, auxiliary materials, and limestone-based auxiliary materials were mixed, granulated, and manufactured. A method for producing a sintered ore in which a high-combustible carbon material is blended in an upper layer of a sintered layer, which is a pseudo-particle raw material.
(11) The ratio of the layer thickness of the upper part of the packed bed filled with the pseudo-particle raw material that makes the carbonaceous material more combustible than the carbonized material in the lower layer of the packed bed is 10% or more and 50% or less. The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer as described in ( 10 ) characterized by these.

  A method for producing sintered ore in which high-combustible carbon material is blended in the upper layer of the sintered layer as an operation to improve the combustibility of the carbon material and improve the productivity of the sintered ore and also improve the product yield of the sintered ore. Can be provided.

Schematic of a sintering pot test apparatus. The figure which shows the ratio of the low density area | region of the sintered cake of the height direction of a raw material filled layer. The figure which shows the oxygen concentration in the waste gas in the baking process of a raw material. The figure which shows the effect of post-addition of powder coke. (A) is a change in yield, and (B) is a change in productivity. The figure which shows the combustibility of a powder coke and char. (A) is combustibility of powder coke, (B) is char 1, and (C) is char 2 combustibility. The figure which shows the effect of post-addition of Char-1. (A) is a change in yield, and (B) is a change in productivity. The figure which shows the effect of the prior addition of the char 1. FIG. (A) is a change in yield, and (B) is a change in productivity. The figure which shows the effect at the time of adding the mixture of powder coke and char 1 beforehand. (A) is a change in yield, and (B) is a change in productivity.

In the production of sintered ore using a downward suction type sintering machine, increasing the combustion property of carbonaceous material increases the combustion rate of fuel, increases the sintering rate, shortens the sintering time, and produces the sintered product. Improves.
On the other hand, according to the above-mentioned patent documents and the like, when the combustibility of the carbonaceous material is increased, the product yield of the sintered ore may be improved but may be lowered, and is uncertain.
Then, this inventor examined the influence on the product yield of the sintered ore at the time of improving the combustibility of a carbonaceous material.

An experiment was conducted to measure the temperature in the raw material packed bed and the sintered density for each layer height when the charcoal combustibility was increased. A schematic diagram of the sintering pot test apparatus used in the experiment is shown in FIG.
The sintering pot test apparatus includes an ignition furnace 1, a sintering pot 2, an air box 3, a blower 4, and an analyzer 5. The diameter of the sintering pot 2 is 300 mm and the bed height is 600 mm. The sintered pot 2 is charged with a pseudo-particle raw material that has improved the combustibility of the carbonaceous material used as a test specimen, and is ignited in the ignition furnace 1 to ignite the surface. Heat the charcoal material. At the same time, the blower 4 is started, exhaust gas generated in the sintering pot 2 is exhausted through the wind box 3, and the exhaust gas is analyzed by the analyzer 5.
The pseudoparticle raw material with improved combustibility is prepared by post-addition of powder coke. That is, after externally adding water to iron ore, auxiliary materials, and limestone-based auxiliary materials, mixing for 1 minute using a drum mixer having a diameter of 1,000 mm, and then granulating for 3 minutes and 40 seconds to produce pseudo particles, A pseudo-particle raw material produced by adding granulated coke and granulating for 20 seconds. The pseudo particle raw material prepared in this manner covers the surface of pseudo particles such as iron ore once produced with powder coke, so that the powder coke is not buried in the pseudo particles and the combustibility of the powder coke. Can be increased.
The blended raw materials mixed and granulated were filled in a sintering pot test apparatus and fired under the conditions of ignition for 90 seconds and suction negative pressure of 12 kPa. During firing, the temperature in the sintered layer was measured at three locations with different layer heights, and the concentrations of CO, CO ₂ and O ₂ in the exhaust gas were also measured. Table 1 shows the raw material composition used in the test.

Table 2 shows the results of measuring the maximum temperature during firing in the upper layer, middle layer, and lower layer of the raw material filled layer. The base is a case of a normal mixing / granulating method, that is, a case where a pseudo-particle raw material is produced by mixing and granulating powdered coke together with iron ore, a secondary raw material, and a limestone-based secondary raw material. The post-addition test is a case where a pseudo particle raw material is manufactured by post-addition of powder coke and the combustibility of the powder coke is increased.
The positions of the upper layer, the middle layer, and the lower layer are distances from the lowermost surface of the raw material packed layer.

  In Table 2, the maximum temperature of the upper layer was increased by post-addition of the powder coke with respect to the base, but the maximum temperature of the middle layer and the lower layer was decreased.

X-rays have the property of transmitting through solids, and the transmittance depends on the density of the solids. By utilizing this property, it is possible to separate the voids and solids of the sintered cake and to obtain information on the density in the solid region. A portion having a relatively high X-ray transmittance in the solid region has a low density, and it has been confirmed by a preliminary test that the yield is lowered when the volume ratio of the low density region to the total solid volume is high.
FIG. 2 shows the low density region ratio (%) in the height direction of the raw material packed layer.
In FIG. 2, in the post-addition test in which the combustibility of the powder coke was increased, the density of the sintered ore in the upper layer of the raw material packed layer increased with respect to the base, but the density of the sintered ore in the middle layer and the lower layer decreased. This corresponds to the increase in the maximum temperature of the upper layer and the decrease in the maximum temperature of the middle layer and the lower layer.

  Next, FIG. 3 shows the oxygen concentration in the exhaust gas in the firing process of the raw material. The time when the exhaust gas temperature reached the maximum was defined as the firing completion time, and the ratio of the firing completion time to the elapsed time was defined as the firing completion position, and is shown on the horizontal axis of FIG. At the beginning of ignition, the temperature of the raw material is low, so the amount of oxygen exhausted without reacting with the coke breeze in an inactive combustion state is large, but as the firing progresses, it becomes an active combustion state, and the oxygen in the exhaust becomes , Get lower. When the firing of the raw material is completed, oxygen in the blown air does not react with the powder coke, so that the oxygen concentration in the exhaust gas increases. When the combustibility of the powder coke is increased by post-addition with respect to the base, the oxygen in the exhaust gas is low. The gasification rate of carbon in the powdered coke can be calculated from the amount of carbon input, the composition of the exhaust gas and the flow rate of the exhaust gas. In the post-addition test after increasing the combustibility, the carbon of the powder coke is effectively combusting at 98.2%.

  From the results of Table 2, FIG. 2 and FIG. 3, in the addition test after increasing the combustibility of the powder coke, the temperature of the middle layer and lower layer of the raw material packed layer is slightly decreased, but the temperature of the upper layer is significantly increased. As a whole, the temperature of the upper layer, middle layer, and lower layer of the raw material filled layer is made uniform, and the sintering density is improved.

Here, the reason why the temperature of the middle layer and the lower layer of the raw material packed layer is slightly lowered by increasing the combustibility of the powder coke is considered as follows.
In the sintering machine, the amount of air sucked per unit time is constant. The post-addition of the powder coke increases the combustibility of the powder coke of the pseudo-particle raw material, so that the amount of fuel burned per unit time is increased and the sintering speed is improved.

The suction gas of the sintering machine is room temperature air, but the suction air passes through the high temperature region where the combustion is completed and is supplied to the combustion region. This hot gas has a preheating action in the combustion region. However, the preheating effect is considered to be small in the upper layer of the packed bed. This is because the high temperature region formed above the combustion region in the upper layer is smaller than the lower layer. In fact, in the lower layer of the packed bed, the firing temperature increased and the sintered ore density increased, and in the upper portion of the packed bed, the firing temperature decreased and the sintered ore density decreased.
In addition, since the amount of air sucked per unit time of the sintering machine is constant, if the powder coke is made highly combustible, the amount of oxygen consumed for the combustion increases and the amount of oxygen in the exhaust gas decreases. .
When the combustibility of the solid fuel contained in the pseudo particle raw material is improved, the combustion speed is increased and the combustion completion time is shortened. As a result, when the raw material of the lower layer of the packed bed is burned, the time for preheating with the high-temperature gas supplied from the upper part is shortened. In other words, the pseudo-particle raw material in the lower layer of the packed bed has both a positive element that the combustion temperature is increased by improving the combustibility of the solid fuel and a negative element that the preheating time with the supplied high-temperature gas is shortened. . As a result, the yield may increase or decrease depending on the operating conditions.
In the upper layer of the packed bed, where the preheating effect cannot be expected, it is important to increase the sintering temperature by increasing the combustibility. On the other hand, it is considered important for the lower layer of the packed bed that can be expected to have a preheating effect to prevent the decrease in the preheating time due to the shortening of the firing time and to secure the preheating time. It was found that the productivity of the entire sintering machine can be maintained and the yield can be improved by the sintering method satisfying these two.
Therefore, the inventor of the present application increases the in-layer temperature of the upper layer of the packed bed while maintaining the sintering speed by “filling only the upper layer of the pallet packed layer with the pseudo-particle raw material having high combustion property of the carbonaceous material”. It was found that the density of sintered ore can be increased and the yield of sintered ore can be improved.
Filling the upper part of the packed bed with the pseudo-particle raw material to which the powder coke is added afterwards increases the FFS of the upper layer of the raw material packed layer to improve the sintering speed and increase the temperature of the upper layer of the packed bed. The yield can be improved.
On the other hand, in the lower layer of the raw material packed bed, the solid fuel is ordinary powder coke, there is no increase in FFS, and there is no reduction in the preheating time of the raw material.

  In the production of sintered ore using a lower suction type sintering machine, the present invention charges carbon material with improved combustibility into the upper layer of the raw material packed bed fed on the pallet of the sintered ore production facility. It is characterized by that.

[Example 1]
Using the sintering pot test equipment shown in Fig. 1, a pseudo-particle raw material with improved combustibility by post-addition of coke breeze is filled in the upper layer of the raw material packed bed, and a test is conducted to investigate the effects on productivity and yield. It was. The raw material composition used in the test is shown in Table 1.
The ratio with respect to the total thickness of the upper layer filled with the pseudo particle raw material with improved combustibility of the powder coke was changed to 0.1 to 1.0. The base is a normal operation without a quasi-particle raw material with enhanced flammability, and the ratio of 1.0 to the total thickness of the upper layer is that of the quasi-particle raw material with the flammability increased in all layers of the raw material packed layer. Is the case. FIG. 4 shows the effect of post-addition of coke breeze. (A) is a change in yield, and (B) is a change in productivity.
The productivity is improved with respect to the base of FIG. The yield is improved with respect to the base when the ratio of the upper layer of the pseudo-particle raw material with improved flammability is 0.1 to 0.5, but is slightly lowered when the ratio is 0.6 or less.
By filling only the upper layer with the pseudo-particle raw material whose combustibility is improved by the post-addition of the powder coke, both productivity and yield are improved.

[Example 2]
As a solid fuel having high combustibility, an experiment was conducted using char obtained by heating brown coal, subbituminous coal, or highly volatile bituminous coal to 800 ° C. and subjecting it to pyrolysis. When low-grade coal is heated and pyrolyzed, the volatile matter in the coal is released as coal gas, and at the same time, tar is also released along with the coal gas, and the solid content of the residual residue becomes char. Char has a higher burning rate than powdered coke.
Table 3 shows the char used in the test and the properties of the raw coal as the raw material.

Using a differential thermobalance, the combustion rate was evaluated by heating in a N ₂ atmosphere from room temperature to 700 ° C. and performing Air combustion at 700 ° C. The char burning rate shown in Table 3 is shown in FIG. (A) is combustibility of powder coke, (B) is char 1, and (C) is char 2 combustibility. If the ratio of the weight reduced by combustion to the total weight is TG (wt%), the faster the decrease in TG (wt%), the higher the combustion speed. The decrease in TG (wt%) of char 2 was fast, and the burning rate was char 2> char 1> powder coke.

A test was conducted to investigate the influence on productivity and yield by filling the upper layer of the raw material packed layer with a pseudo-particle material whose combustibility was improved by post-addition of Char 1. FIG. 6 shows the effect of post-addition of Char 1. When the ratio of the upper layer using the pseudo-particle raw material whose flammability is increased by the post-addition of Char 1 is 0.1 to 0.3, the productivity and the yield are higher than when the powder coke is added after the addition. The improvement was great. In the figure, the result is shown in the case where the ratio of the upper layer using the pseudo-particle raw material whose flammability is improved by the post-addition of Char 2 is 0.3 (marked with ●). The productivity and yield were slightly improved compared to Char 1.
Moreover, the test example (x mark) which carried out the post addition of the carbonaceous material which mixed powder coke and char 2 1: 1 in the figure, and was filled into the upper layer of the raw material filling layer is shown. In the case of mixed charcoal, productivity and yield were lower than in the case of powdered coke or char alone. That is, no synergistic effect was observed.

[Example 3]
FIG. 7 shows the effect of adding char 1 before. (A) is a change in yield, and (B) is a change in productivity. The pre-addition of the char 1 is a case where the char 1 is mixed and granulated with iron ore, a secondary raw material, and a limestone-based secondary raw material to produce pseudo particles, and filled in the upper layer of the raw material packed bed. The yield was improved when the ratio of the upper layer of the raw material packed layer to the total thickness was in the range of 0.1 to 0.4. However, the productivity and yield are slightly inferior to those after the char 1 shown in FIG. In the case of pre-addition, it is considered that the char was buried in the quasi-particle and caused a decrease in combustibility.

[Example 4]
FIG. 8 shows the effect in the case of pre-adding a carbonaceous material mixed with powdered coke and char 1 in a ratio of 1: 1 and filling the upper layer of the raw material packed layer. (A) is a change in yield, and (B) is a change in productivity. The yield was improved when the ratio of the upper layer of the raw material packed layer to the total layer thickness was in the range of 0.1 to 0.5. However, the improvement in productivity and yield was slightly inferior to the previous addition of Char 1 in FIG.

  INDUSTRIAL APPLICABILITY The present invention can be used as an operation capable of improving sintering productivity and improving the yield of sintered ore products.

  DESCRIPTION OF SYMBOLS 1 ... Ignition furnace, 2 ... Sintering pan, 3 ... Wind box, 4 ... Blower, 5 ... Analyzer.

Claims (11)

The blended raw material is filled in two layers on the pallet of a Dwytroid-type sintering machine, the carbonaceous material contained in the blended raw material is burned while sucking air downward, and the mixed raw material is sintered by the combustion heat. A method for producing sintered ore,
In the lower layer of the packed bed on the pallet, iron ore, auxiliary raw material, limestone auxiliary raw material and charcoal material are mixed and filled with pseudo-particle raw material produced by granulation,
The upper layer of the packed bed on the pallet is filled with a pseudo-particle material that makes the charcoal material more combustible than the carbon material of the lower layer of the packed bed. It is a method for producing ore ,
The quasi-particle raw material of the upper layer of the packed bed in which the carbon material is more combustible than the carbon material of the lower layer of packed bed
Mixing and granulating iron ore, auxiliary raw material, limestone-based auxiliary raw material to produce a pseudo particle raw material, and adding the carbonaceous material to the pseudo particle raw material produced in the above step and granulating the raw material,
A method for producing a sintered ore in which a high-combustibility carbonaceous material is blended in the upper layer of a sintered layer, which is a pseudo-particle raw material produced by practice. 2. The upper layer of the sintered layer according to claim 1 , wherein the carbon material of the upper layer of the packed bed used for the pseudo-particle raw material having a higher flammability than that of the lower layer of the packed bed is coke powder. A method for producing sintered ore containing highly combustible carbonaceous materials. The ratio of the thickness of the upper layer portion of the packed layer filled with the pseudoparticle raw material having a higher combustibility than the carbon material of the lower layer of the packed layer to the total thickness of the packed layer is 10% or more and 50% or less. The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer of Claim 2 to do. Charcoal material in the upper layer of the packed bed used for the pseudo-particle raw material that has higher combustibility than that of the lower layer of the packed bed heats at least one of lignite, subbituminous coal, or highly volatile bituminous coal and pyrolyzes it. The method for producing a sintered ore in which a highly combustible carbonaceous material is blended in the upper layer of the sintered layer according to claim 1 , wherein the char is obtained by the following process. The ratio of the thickness of the upper layer portion of the packed layer filling the pseudo-particle raw material having a higher combustibility than the carbon material of the lower layer of the packed layer to the total thickness of the packed layer is 10% or more and 30% or less. The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer of Claim 4 . The carbon material in the upper layer of the packed bed used for the pseudoparticle raw material having a higher combustibility than the carbon material in the lower layer of the packed bed heats at least one of lignite, subbituminous coal, or highly volatile bituminous coal, and pyrolyzes it. The method for producing a sintered ore comprising a high-combustible carbon material blended in the upper layer of the sintered layer according to claim 1 , wherein the char and powder coke obtained by mixing are mixed.   The ratio of the thickness of the upper layer portion of the packed layer filled with the pseudoparticle raw material having a higher combustibility than the carbon material of the lower layer of the packed layer to the total thickness of the packed layer is 10% or more and 50% or less. The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer of Claim 6. The blended raw material is filled in two layers on the pallet of a Dwytroid-type sintering machine, the carbonaceous material contained in the blended raw material is burned while sucking air downward, and the mixed raw material is sintered by the combustion heat. A method for producing sintered ore,
In the lower layer of the packed bed on the pallet, iron ore, auxiliary raw material, limestone auxiliary raw material and charcoal material are mixed and filled with pseudo-particle raw material produced by granulation,
The upper layer of the packed bed on the pallet is filled with a pseudo particle raw material that makes the charcoal material more combustible than the charcoal of the lower layer of the packed bed,
The pseudo-particle raw material that makes the carbon material more combustible than the carbon material in the lower layer of the packed bed,
Iron ore, auxiliary materials and limestone auxiliary materials;
Upper layer of sintered layer characterized by being a pseudo-particle raw material produced by mixing and granulating char obtained by heating and pyrolyzing at least one of lignite, sub-bituminous coal or highly volatile bituminous coal The manufacturing method of the sintered ore which mix | blended highly combustible carbonaceous material with. The ratio of the filler layer upper layer layer thickness filled with the pseudo particle material having a carbon material having higher combustibility than the filler lower layer carbon material to the total layer thickness is 10% or more and 40% or less. The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer of Claim 8 . The blended raw material is filled in two layers on the pallet of a Dwytroid-type sintering machine, the carbonaceous material contained in the blended raw material is burned while sucking air downward, and the mixed raw material is sintered by the combustion heat. A method for producing sintered ore,
In the lower layer of the packed bed on the pallet, iron ore, auxiliary raw material, limestone auxiliary raw material and charcoal material are mixed and filled with pseudo-particle raw material produced by granulation,
The upper layer of the packed bed on the pallet is filled with a pseudo particle raw material that makes the charcoal material more combustible than the charcoal of the lower layer of the packed bed,
The pseudo-particle raw material that makes the carbon material more combustible than the carbon material in the lower layer of the packed bed,
A mixture of char and powdered coke obtained by heating and pyrolyzing at least one of lignite, subbituminous coal, or highly volatile bituminous coal, and iron ore, auxiliary materials, and limestone-based auxiliary materials were mixed, granulated, and manufactured. A method for producing a sintered ore in which a high-combustible carbon material is blended in an upper layer of a sintered layer, which is a pseudo-particle raw material. The ratio of the layer thickness of the upper part of the packed bed filled with the pseudoparticle raw material in which the carbonaceous material is more combustible than the carbonized material in the lower layer of the packed bed to the total thickness of the packed bed is 10% or more and 50% or less. The manufacturing method of the sintered ore which mix | blended the highly combustible carbon material with the upper layer of the sintered layer of Claim 10 to do.

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