JP5459655B2 - How to treat tailings - Google Patents

Description

  The present invention relates to a method for treating ultrafine tailings known as wet beneficiation residues of iron ore, and in particular, after the tailings have been discharged from the mountain base and shipped at the loading port (loading site), It is a proposal about the processing method until it becomes a sintering raw material in a loading port (lifting place).

  In recent years, the demand for iron ore as a raw material has been increasing worldwide in response to an increase in steel demand in emerging countries such as China and India. By the way, Japanese steel companies import about 60% of iron ore mainly from Australia. However, in Australia, matite ore is depleted to a high grade suitable for the production of sintered ore. Therefore, recently, marathan ore containing a large amount of goethite, pisolite ore or hematite ore containing a large amount of phosphorus. In fact, the fact is that it is becoming the mainstay of shipping.

  As iron ore suppliers, there are Yamamoto, such as Brazil and India, in addition to Australia. In principle, iron ore with an Fe content of 60 mass% or more is given priority for domestic use and export is restricted. Yes. Therefore, when it sees as the whole world, it is the actual condition that the high grade iron ore whose Fe is 60 mass% or more is remarkably insufficient. In this sense, there is a strong demand for technological development for effective use of low-grade iron ore that has not been used so far.

In the iron ore base, the gangue-bearing iron ore mined in the mine is usually crushed, the lump ore is first separated and separated by sizing treatment, and then the undersized iron ore powder is further sintered by wet sizing treatment. Separated and recovered as fine ore. On the other hand, the fine powder which is undersize after this wet sizing treatment is poured into a thickener, the precipitate residue from this thickener is extracted, and this is treated as tailing (also called tailing, which is a useful ore concentrate. In general, the ponds and swamps near the mine are used as sedimentary deposits (usually called Mt. Bota or Mt. Zuri). This tailing has a slightly lower iron content of 54 mass% than the concentrate, while it contains 1.4 to 5.0 mass% of SiO ₂ and Al ₂ O ₃ as slag components, and the average particle size (laser scattering) Method: (Measured by (Microtrack)) is as small as 10 μm or less, so that it has been regarded as an inappropriate ore as a raw material for producing sintered ore. Therefore, although it is a storage, it is practically equivalent to the situation of being discarded. The amount of storage is said to be tens of millions of tons depending on the mine.

  By the way, in recent years, with the increasing demand for iron ore, the number of mountains (mines) near the coast, which are convenient for iron ore loading, has been decreasing. Yamamoto, which supplies iron ore overseas, is expected to become more inland (outback). This means that the ratio of inland transportation costs to the total transportation costs will increase, and this will cause the price of raw materials (iron ore) to rise.

  In addition, since the tailings described above have a particle size as small as 10 μm, there is a problem that handling is extremely difficult. In particular, the ultrafine powder with a particle size of about 10μm, which is the main constituent of tailings, is easily scattered as airborne dust in the atmosphere, so there is a general situation that it must be stored in ponds and marshes. is there.

  By the way, with respect to coal transportation, in Patent Document 1, in order to reduce inland transportation costs, port construction costs, and marine transportation costs that occupy a large proportion of the total transportation costs from the base to the unloading, (a) (B) The slurry transported inland is temporarily stored in the loading area, and the pulverized coal in the slurry is granulated with an underwater granulator ( c) After transporting the pelletized coal to the dewatering and mechanical lifting equipment installed offshore via the submarine pipeline, (d) after dehydrating the slurry containing the pelletized coal transported from the submarine pipeline, It proposes a coal transportation method to ship dehydrated pets.

However, when such a transportation method is applied to the handling of the tailings, there are the following problems.
The first problem is that tailings are difficult to granulate in water, unlike coal, and the second problem is that tailings or tailings granulates can be used to reduce maritime transportation costs. Where it is necessary to dewater as much as possible, the particle size of tailings is as small as 10 μm or less, and there are problems such as dewatering efficiency and clogging, and there is a limit to dewatering. That is, tailings are small in particle size, have high hydrophilicity and are clayey, and are difficult to handle even when dewatering is performed with a filter press or the like.

JP 58-193832 A

  In order to solve the handling problems that the conventional technology has, a method of drying the tailings with a special dryer such as a rotary kiln and then adding dry dust or binder to briquettes or pellets is also considered. However, problems remain in terms of equipment costs and operating costs.

  For this reason, conventionally, there is no effective method for granulating and transporting tailings at a low cost. For this reason, until now, it has been practical to use ponds and marshes in mountainous areas. In fact, the waste was stored in a discarded state and was not used effectively.

  Therefore, in view of the circumstances as described above, the object of the present invention is to enable reduction of transportation costs and the like for iron ore tailings stored in a mountainous form in a form close to the disposal state. The object is to propose a processing method for obtaining a suitable state as a raw material.

In order to realize the above object, the inventors propose a tailing treatment method described below. That is, the present invention provides a tailored granulator that is a high-moisture ultrafine iron ore having an average particle size of 10 μm or less that is generated during wet beneficiation at a mountain base without being subjected to a drying treatment. At the time of mixing granulation of tailings at that mountain, adding one or more selected from iron ore powder, dry raw material powder and additive material having lower moisture than tailings, and mixing and granulating, The tailing granule is transported to the landing site through the loading site, and then used as a sintering raw material without drying the tailing granulated product in the landing site. Is the method.

  In the tailing treatment method of the present invention, the tailings granulated product is singly or mixed with other sintering raw materials in a fried land and crushed with a mixer or a stirrer, and has an average particle size of 1 mm to 5 mm. Thus, it is preferable to mix with other sintering raw materials and granulate to form a forming sintered raw material.

  In the tailing treatment method of the present invention, the tailings granulated material is mixed with other sintered raw materials as a tailing raw material having a water content of more than 15 mass% by adding water in the landing site. Therefore, it is preferable to form and sinter the raw material.

  In the tailing treatment method of the present invention, the tailing preferably has a water content of 30 to 60 mass%.

In the tailing treatment method of the present invention, as the tailing, the composition of the main component is Fe ≧ 60 mass%, SiO ₂ ≧ 1.5 mass%, Al ₂ O ₃ ≧ 1.5 mass%, South American hematite iron ore It is preferable to use a stone which is obtained as a wet beneficiation residue at the base and stored outdoors.

In the tailing treatment method of the present invention, the tailing includes, as the tailing, an African hematite iron ore whose main components are Fe ≧ 54 mass%, SiO ₂ ≧ 1.5 mass%, and Al ₂ O ₃ ≧ 1.4 mass%. It is preferable to use a stone which is obtained as a wet beneficiation residue at the base and stored outdoors.

  In the tailing treatment method of the present invention, the tailing granulated product preferably has a water content of 5 to 15 mass%.

  According to the present invention, which is a treatment method as described above, the high-moisture ultrafine powder tailing that has been stored in a discarded state at the base is agglomerated in advance at the base without being subjected to drying treatment. Because it is a chemical, the transportation cost from the mountain to the landing site can be greatly reduced, and as a result, the road for effective use of low-grade iron ore at low cost can be opened.

  According to the present invention, the tailings of iron ore that are difficult to handle due to the high water content and the ultra fine powder state are granulated using a mixing and stirring type granulator. Can be

  According to the present invention, in the tailing granulation (agglomeration), in addition to using a mixing and stirring type granulator, depending on the amount of water in the tailing with high moisture and the tailing, low moisture iron ore Since any one or more selected from stone powder, dry raw material powder and additives are added and mixed and granulated, agglomeration at the base is easy.

  According to the present invention, an agglomerated product (tail ore granulated product) with a small amount of adhering moisture can be obtained, so that it is easy to handle in a subsequent process, for example, a reclaimer, a loading heavy machine, a belt conveyor or the like.

  Furthermore, according to the present invention, the drying facility at the loading and unloading sites is not necessary, and it can be immediately used as a raw material for sintering. In addition, about the tailing granule which performed such a process, when using this as a sintering raw material, since this tailing granulation (agglomerated material) is constituted by ultrafine powder, Since it comes to act as a binder at the time of a sintering process, the productivity of a sintered ore is improved.

It is explanatory drawing which shows the relationship between the moisture content and volume of a tailing. It is a graph which shows the relationship between the moisture content of a tailing, and the agglomerated material (tailing granulated material) particle diameter after granulation. It is a schematic diagram which shows the installation centering on the mixing stirring type granulator used in the method of this invention. It is a figure of the tailing handling flow which shows the Example of this invention. 6 is a graph showing a firing test result in Example 2. 6 is a graph showing a firing test result in Example 2.

  FIG. 1 is an explanatory diagram showing a general relationship between the moisture content (here, the moisture content is a moisture content ratio with respect to the weight of the wet raw material) and the volume of the sample for a high-moisture and highly viscous tailing. FIG. 2 is a graph showing the relationship between the water content of such tailings and the agglomerate particle size.

  In FIG. 1, the liquid region 4 in the figure is a region where the tailings are freely deformed. As the water content decreases, the volume of the tailings gradually decreases, and there is a slight amount in the tailings. This is a region where shear resistance occurs. The water at this time is the liquid limit 7.

  When the water content of the tailings is further reduced to the liquid limit of 7 (about 30 mass%) or less, the volume of the tailings is further reduced to show plasticity. In general, the plastic region 3 is a region where a fracture surface is generated when the tailings are squeezed and the deformation does not continue like the liquid region 4. The water content at this time is called the plastic limit 6 (about 20 mass%).

  When the water content is further reduced from the plastic limit 6, the contraction of the tailing volume is settled and eventually stops, and the semi-solid region 2 or the solid region 1 is obtained. The water content at which the shrinkage stops is called a shrinkage limit of 5 (about 10 mass%).

  According to the inventors' research, it is necessary to adjust the moisture content in the range from the solid region 1 to the semisolid region 2 in order to granulate and agglomerate the high-moisture tailings for easy handling. I understood. In this respect, if the tailings can be agglomerated at a moisture content of the shrinkage limit 5 to the plastic limit 6, it is considered that the dewatering cost can be reduced.

  In addition, the moisture content (30-60 mass%) of the tailings in the liquid region is reduced, and the semi-solid region 2 of at least about 10-20 mass%, preferably about 15 mass% or less, more preferably about 10 mass% or less. In order to obtain a stable solid region 1, it is effective to mix (blend) low-moisture iron ore powder, dry raw material powder, or the like. For example, as low-moisture iron ore, fine iron ore before wet beneficiation treatment can be used in Yamamoto. Since the iron ore powder before wet beneficiation placed in the yard at the foot of the mountain has a moisture content of about 3 to 8 mass%, it is useful as one of the low moisture iron ore powders.

  As for the moisture content suitable for the granulation (agglomeration) of such tailings, there is an example in which the moisture content is about 10 to 20 mass% in the construction sludge treatment process, and the inventors have a moisture content of 20 mass. A laboratory experiment was conducted aiming at agglomeration of tailings in the vicinity of%. As experimental materials, a tailing with a water content of 40 mass%, a low moisture iron ore powder having the same brand as this tailing and a water content of 4 mass% were mixed and used. Each moisture content is a value simulating a state of being stored in a pond or the like in a pond at a mountain or a state of being placed in a yard.

  FIG. 2 shows the result of the granulation experiment at this time. In this figure, the horizontal axis represents the moisture content of the experimental material, and the vertical axis represents the average particle size of the discharged agglomerated material.

  In the experiment, 40 kg of tailing (water content 40 mass%) alone was first added to the mixing and stirring type granulator and mixed and stirred. However, since the mixture was in a slurry state, agglomeration was impossible (region 8b in the figure). Next, when the blending amount of the low-moisture iron ore powder having a moisture content of 4 mass% is increased to 70 mass% and the total moisture content is reduced to 15 mass% with respect to the tailings, the granulation of the mixture is smoothly performed ( Region 8a). Furthermore, when the moisture content of the granulated product was reduced to about 10 mass% or less, a small pelletized agglomerated product (tailed granulated product) having an average particle size of about 5 mm was obtained.

  From the above experimental results, the high-moisture tailings stored in fields such as marshes are granulated using a mixing and stirring type granulator without drying, or preferably low It has been found that when granulation is performed after mixing iron ore powder of moisture, dry raw material powder or dry additive, etc., handling becomes easy, and it can be made economically transportable.

Hereinafter, an example of an embodiment of the processing method of the present invention will be described with reference to FIGS.
FIG. 3 is a schematic diagram showing equipment centering on a mixing and stirring granulator used in the method of the present invention. In this figure, reference numeral 10 denotes a mixing and stirring type granulator, in which a plurality of rotating blades 11 for stirring and kneading a charge (tailing) are attached to a rotating shaft 11a. It is arranged in a state. The mixing and stirring granulator 10 is not limited to a horizontal installation, but may be an inclined arrangement. There are no restrictions on the shape of the rotary blades and the number of rotary blades of this granulator, and the granulator should be suitable for the granulation performance and power cost. In the mixing and agitation granulator 10, the rotary blade 11 is supported so as to go around the entire apparatus around the rotation shaft 11a, and the rotation direction and the rotation speed are variable. The rotating shaft 11a may be eccentric, or the rotating shaft 11a itself may be supported by another rotating shaft.

  The mixing and agitation granulator 10 includes a measuring device 12, and a predetermined control signal is output from the measuring device 12 to the cutting devices 15 and 22 of the respective silos 13, 16, 17, and 18. The input amount (acceptance amount) of the charge can be automatically managed.

  Next, a method for supplying tailings to the mixed stirring granulator 10 will be described. The mixing (stirring) of the mixture containing tailings or dry iron ore powder or the like into the mixing and stirring granulator 10 is carried out with a movable heavy machine / hopper suitable for local conditions. In order to smoothly add the tailings into the mixing and agitation granulator 10, a storage tank and a sedimentation tank for receiving slurry are installed, and a sedimentation mud having a moisture content of about 55 mass% is used. It is desirable to use it. Then, the sedimentation mud is scraped off by a heavy machine such as a backhoe and directly charged into the mixing and stirring granulator 10, or a receiving silo 13 having a cutting device 15 suitable for sludge such as a power feeder or a twin screw feeder. However, the method is not limited to this method.

In the present invention, preferably, the moisture content is adjusted by mixing any one or more of a low moisture raw material (iron ore powder), a dry raw material powder or a dried additive with the tailings.
a. The low-moisture iron ore powder 19 is an iron ore powder having a lower moisture content than the tailing 14 for processing purposes, and may be anything that can adjust the moisture content of the agglomerated material. For example, in Yamamoto, it is preferable to use iron ore powder having a moisture content of 3 to 8 mass% before wet beneficiation.
b. The dry raw material powder 20 is a powder having a moisture content close to 0 mass%. For example, it is preferable to use dry dust-collecting iron ore powder (dust) generated in the process of beneficiation of iron ore.
c. The additive 21 is added in order to increase the strength of the agglomerated material. For example, it is preferable to use cement, quicklime, a binder, a drug, or the like.

  In the method of the present invention, preferably, the low-moisture iron ore powder 19 and the dry raw material powder 20 are added to the tailing 14 to adjust the moisture content necessary for agglomeration, and the handling strength is mainly improved. In order to increase the moisture content management accuracy of these (low-moisture iron ore powder 19, dry raw material powder 20, additive 21) is added. , 17 and 18 are preferably stored. These raw material cutting devices 15 and 22 from silos such as tailings 14 and low-moisture iron ore powder 19 are operated and stopped by the control signal of the weighing device 12.

Next, a method for agglomerating tailings by the mixed stirring granulator 10 will be described.
First, the high-moisture (30-60 mass%) tailings 14 are charged into the mixing and stirring granulator 10 in a predetermined amount, and the low-moisture iron ore powder 19 or the dry raw material ( It is desirable to add (iron ore) powder 20 and mix and granulate. The input amounts of these raw materials are measured by a measuring device 12 provided attached to the mixing and stirring type granulator 10, and if the input amount actual values are known, the necessary low moisture iron ore powder 19 and dry raw material powder 20 are obtained. It is because the addition amount of can be calculated. Under such a granulation method, the water contained in the tailing 14 can be sufficiently released by first stirring the tailing 14 with the rotary blade 11, but the low-moisture iron ore added thereafter There is a merit that the stone powder 19 and the dry raw material powder 20 can efficiently absorb the moisture of the tailings.

  Next, the curing and transporting method of the agglomerated product obtained by mixing and granulating will be described. The agglomerated product discharged from the discharge port 23 of the mixing and stirring granulator 10 is supplied to the rolling device 25 by a transport machine 24 such as a belt conveyor, and then further by the rolling device 25 as necessary. It is preferable that the particles are rolled and granulated, then fed to the curing yard 26 by the transport machine 24 and naturally cured, and then transported. The reason is that most of the agglomerated material discharged from the granulator 10 has moisture adhering to the surface, and when the agglomerated material is piled up, the agglomerated materials are compacted and fixed together to form a large solid mass. This is because there is a possibility of becoming. In order to prevent such a situation, it is effective to scrape and level regularly with a heavy machine, or preferably to smooth out irregularities on the surface of the agglomerated material with the rolling device 25 or the like after discharging.

  As a mixing granulation method, an inclined belt conveyor, a pan pelletizer, a rolling drum and the like may be used in a combination suitable for local conditions, and complicated equipment is not required. The agglomerated material thus subjected to rolling granulation has less surface irregularities, and the agglomerated material is less likely to stick to the curing yard 26.

  Thus, according to the present invention, by using the mixing and stirring granulator 10, it is possible to granulate and agglomerate the ultrafine powder tailing with high moisture as it is without drying. It can be handled and transported easily.

  Next, the agglomerated material (tailed granulated material) mixed and granulated at the mountain as described above is transported to a loading site (shipping port) by a belt conveyor, a transport vehicle, a freight car or the like, and then an ore transport ship. For example, it will be transported to our country which will be a landing site (unloading port). In the present invention, the tailings granule thus unloaded in the landing site is basically directly as a part of the sintering raw material as it is, that is, without drying and without sizing. It can be used by mixing with a conventional sintering raw material.

  However, the tailings granulates described above are sometimes coarse granulates with an average particle size of 10-30 mm, especially in the case of those that are mixed and granulated in a “semi-solid region” as shown in FIG. May be. In this case, if this is used directly as a sintering raw material, non-uniform firing may be caused, resulting in a problem that the sintering productivity is lowered.

Therefore, in the present invention, the tailings granulated product is processed as it is in the fried land without being dried, or mixed with other sintering raw materials, and an Eirich mixer, a Redige mixer, a proshear mixer, a paddle mixer. By using a mixer or a crusher that is a stirrer, and crushing to an average particle size of 5 mm or less, preferably 4 mm or less to use as a raw material powder for forming sintered raw material, The granulation property of the sintering raw material is improved, and the sintering productivity can be increased. In addition, although an Eirich mixer, a Redige mixer, etc. are used also as a granulator, it can be used as a crusher by using it increasing a rotation speed.
In addition, although crushing of the said tailing granulated material is so fine that it is fine, a minimum is pulverized so that it may become an average particle diameter of about 1 mm, desirably an average particle diameter of about 2 mm. When pulverized to such a particle size range (1 to 5 mm), when added to other sintering raw materials and granulated, the tailings are further mixed by mixing and stirring during granulation. It is subdivided and has an average particle size of 10 μm or less, and is dispersed in the raw material and used as a forming sintered raw material powder.

  Moreover, in this invention, as a process in a fried land, the said tailing granulated material is made into a slurry by adding water and mixing and stirring until a water content exceeds 15 mass% as it is, and it uses as a shaping | molding sintering raw material. In order to ensure the fluidity and dispersibility of the ultrafine powder, particularly the tailing, in the tailings granulated product, it is easily dispersed in the raw material by mixing and stirring during granulation. As a result, granulation properties can be improved and productivity can be increased. In addition, the upper limit of the addition amount of water at the time of making the slurry is set to a value that does not exceed the set water amount at the time of sintering raw material granulation.

Example 1
FIG. 4 shows an embodiment of the method of the present invention in which tailings of iron ore are transported to a loading site and processed. As shown in this figure, the tailings 14 generated at the mountain base 27 are stored in the pits 28. The tailings 14 are stored in the water in the pit 28, and are sent from the pit 28 to the precipitation tank 29 or the temporary storage yard 32 by using a pipe 30 and a pump 31, or by a heavy machine, as necessary. It is done. The moisture content of the tailings at this time is 30-60 mass%.

  Then, the tailing 14 mainly in a slurry state is charged into the receiving silo 13 by the heavy equipment 33 from the precipitation tank 29 or the temporary storage yard 32. The tailing slurry may be fed directly into the mixing and stirring granulator 10 with a heavy machine without going through the receiving silo 13. Of course, simple curing may be performed in the temporary storage yard 32 before the mixing and stirring granulator 10 is charged. At least one of low-moisture iron ore powder 19, dry iron ore powder 20, and additive 21 is selected based on the amount of tailings (actual) and moisture content introduced into the mixing and stirring granulator 10 from the receiving silo 13. It is cut out from each silo 16, 17, 18 for each fixed amount. All the tailings mixed slurry that has been charged is mixed, stirred and granulated in the mixing and stirring granulator 10 and then discharged.

  The agglomerated product (tailing granulated product) produced through such treatment is transported to the rolling device 25 and loaded in the curing yard 26 according to the agglomeration state, and the tailing 14 is naturally cured. The agglomerated product 38 is loaded onto the ship 34 by the heavy machinery 33. After that, it is transported to the landing site (steel mill), and after unloading, it is loaded in the steel mill yard, cut out without being dried, sent to the sintering plant, and the raw material for forming and sintering raw materials. Used as part of the powder.

In this example, Carajas iron ore was used as the tailing ore as South American hematite ore. This calajas iron ore has a composition of main components of Fe ≧ 60 mass%, SiO ₂ ≧ 1.5 mass%, and Al ₂ O ₃ ≧ 1.5 mass%. In addition, Kumba iron ore was used as an example of African hematite iron ore. This cumba iron ore has the composition of main components of Fe ≧ 54 mass%, SiO ₂ ≧ 1.5 mass%, and Al ₂ O ₃ ≧ 1.4 mass%. Moreover, the blending ratio of tailings is 18 mass%, low moisture ores are 82 mass%, and no dry powder or additives are used. Depending on the water content of the tailings, the blending ratio of the tailings is 5-40 mass%, low-moisture iron ore powder 60-95 mass%, if necessary, dry iron ore powder 1-10 mass%, additive 1-10 mass% Is preferable. When these tailings were used and applied to the tailing processing method according to the present invention described above, it was confirmed that the tailings could be processed without problems.

(Example 2)
The tailings granulated product (agglomerated product) produced in Example 1 was subjected to a firing experiment in a laboratory test apparatus that simulated a DL-type sintering machine at a blending ratio shown in Table 1. The comparative example is an example in which no tailing granulation is blended, the invention example 1 is an example in which 6.7 mass% of the ore raw material is transferred to the tailing granulation as it is, and the invention example 2 is in a fried land In this example, the tailings granulated material was pulverized for 3 minutes at 25 rpm with an Eirich mixer. Inventive Example 3 is an example in which in the fried land, water is added to the tailings granulated material, water is added, the water content is over 20 mass%, and the mixture is stirred and slurried to form a water content of 20-22 mass%. It is. The firing test was carried out using a sintering iron pan having a diameter of 300 mm and a height of 400 mm and a constant suction differential pressure of 200 mmAq.

  In this firing test, as shown in FIG. 5, it can be seen that Invention Example 1 according to the present invention can use the tailings granulated material as it is as a forming and sintering raw material. Compared to the comparative example, when the moisture value of the tailings granulated product becomes high, a formed sintered raw material containing coarse granulated products resulting from uneven distribution of moisture in the granulating step is generated, causing non-uniform firing, It was found that there was an area where productivity decreased.

  Further, the firing test of Invention Example 2 according to the present invention can be said to be moisture suitable for handling, but when containing 5 to 5 mass% of moisture, tailing that causes deterioration of granulation in the case of moisture on the higher side. This is an example in which the granule is preliminarily pulverized with an Eirich mixer and used. In Invention Example 2, the average particle size in the tailings granule is obtained by crushing with an Eirich mixer, and further by the stirring effect at the time of granulation when used as a raw material powder of a shaped sintered raw material to a sintered raw material. Tailings having a diameter of 10 μm or less were also uniformly dispersed in the raw material, and these acted synergistically to improve granulation. As a result, the firing was performed uniformly, and as shown in FIG. 5, the sintering productivity was more stable than the comparative example and the invention example 1.

  Inventive Example 3 according to the present invention is pulverized after being slurried by pouring water into the tailings granulated material and stirring and mixing as a water content exceeding 15 mass% to 22 mass% in the fried land, The slurry is added to other sintering raw materials, mixed and granulated. As a result, tailings with an average particle size of 10 μm or less in the tailings granulated material behave with the same fluidity as water, so that they are uniformly dispersed in the sintering raw material, improving granulation properties, and firing. As shown in FIG. 6, the sintering productivity was high and stable.

  In addition, the upper limit value of the water content in the tailing granulated product during slurrying can be freely set within a range that does not affect the set water content during granulation of the sintered raw material. If it affects the set moisture content during granulation of the sintering raw material, it can be set freely by reducing the blending amount of the slurried tailings granulated product or reducing the moisture content in the slurry. You can also.

  The present invention is a technique related to a processing method for tailings, but this technique is also effective as a processing method for not only tailings and mixed powders thereof but also high moisture ultrafine powder raw material powder.

DESCRIPTION OF SYMBOLS 10 Mixing stirring type granulator 11 Rotary blade 11a Rotating shaft 12 Metering device 14 Tailings 15 and 22 Cutting device 19 Low-moisture iron ore powder 20 Dry raw material (iron ore) powder 21 Additive 25 Rolling device 26 Curing yard 27 Yamamoto 28 Pit 29 sedimentation tank 30 pipe 31 pump 32 temporary storage yard 33 heavy machinery 34 ship

Claims (7)

The tailing, which is a high-moisture ultrafine iron ore with an average particle size of 10 μm or less, generated during wet beneficiation at Yamamoto, is directly introduced to the mixing and stirring granulator without being dried. Tailing granulation obtained by mixing and granulating any one or more selected from iron ore powder, dry raw material powder and additive material having lower water content than tailing at the time of mixing granulation of tailing A method for treating tailings, characterized in that the goods are transported to a landing site through a loading site, and then the tailings granulated material is used as a sintering raw material without drying even in the landing site. The tailings granulated material is mixed with other sintered raw materials in an uplifting area, alone or mixed with other sintered raw materials, and crushed with a mixer or a stirrer, with an average particle size of 1 mm to 5 mm. 2. The tailing treatment method according to claim 1, wherein the raw material is granulated into a shaped sintered raw material. The tailing granulated material is mixed with other sintering raw materials as a shaped sintering raw material as a tailing raw material with a water content of more than 15 mass% by adding water in the landing site. The processing method of the tailings of Claim 1 characterized by the above-mentioned. The tailing treatment method according to any one of claims 1 to 3, wherein the tailing has a water content of 30 to 60 mass%. The tailing is a South American hematite iron ore having a composition of main components of Fe ≧ 60 mass%, SiO ₂ ≧ 1.5 mass%, Al ₂ O ₃ ≧ 1.5 mass%, and a wet beneficiation residue at the mountain the resulting method for processing tailings according to any one of claims 1-4, characterized in that those which are貯鉱outdoors as. The tailing is an African hematite iron ore in which the composition of main components is Fe ≧ 54 mass%, SiO ₂ ≧ 1.5 mass%, Al ₂ O ₃ ≧ 1.4 mass%, and a wet beneficiation residue at the mountain the resulting method for processing tailings according to any one of claims 1-4, characterized in that those which are貯鉱outdoors as. The tailing granule according to any one of claims 1 to 6 , wherein the granulated product has a water content of 5 to 15 mass%.

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