JP2020501014A - Apparatus for producing granulated material, apparatus for producing sintered ore provided with the same, and method for producing sintered ore - Google Patents

Abstract

An object of the present invention is to provide an apparatus for producing a granulated material capable of securing the strength of a granulated substance and ensuring air permeability in a raw material layer, a production apparatus for a sintered ore provided with the same, and a method for producing a sintered ore. .
[Solution]
TECHNICAL FIELD The present invention relates to a granulated product manufacturing apparatus, a sintered ore manufacturing apparatus provided with the same, and a sintered ore manufacturing method, wherein a first iron ore, an auxiliary material and a fuel are mixed to form a first compound A first pre-processing unit capable of producing a raw material and combining the first blended raw material to produce a first granulated product, and a second blended raw material including a second iron ore, a powder raw material and a fuel And a second pre-processing unit capable of crushing the molded body to produce a second granulated product by compressing and molding the molded body, and ensuring air permeability in the raw material layer. Therefore, the present invention is characterized by improving sintering productivity and quality.
[Exploded view] Fig. 2

Description

  The present invention relates to an apparatus for producing granulated material, an apparatus for producing sintered ore and a method for producing sintered ore provided with the same, and more particularly to granulation capable of improving the quality and productivity of sintered ore. The present invention relates to an apparatus for manufacturing a product, an apparatus for manufacturing a sintered ore provided with the same, and a method for manufacturing a sintered ore.

  As a manufacturing process of sintered ore for sintering fine iron ore to have a size suitable for use in a blast furnace, Dwight-Lyoid (hereinafter, referred to as “DL”) that can be mass-produced. The sintering process of the formula is mainly used. In such a DL-type sintering step, fine iron ore, auxiliary raw materials, fuel (coke fines, anthracite), and the like are put into a drum mixer and mixed and humidified (raw material weight ratio: about 7 to 8%). Then, it is charged at a certain height on a bogie of a sintering machine which has been made into pseudo particles. Then, after the surface is ignited by the ignition furnace, the sintering compound material is fired while forcibly sucking air from below to produce sintered ore. The sintered ore after sintering is cooled in a cooler through a crusher in an ore mining section, and classified into a particle size of 5 to 50 mm, which is easy to be charged into the blast furnace and to perform a reaction. Sent to the blast furnace.

  On the other hand, in the production of sinter, the use of low-grade iron ore with a high fines ratio of 0.15 mm or less is being used as iron ore with a high iron content and relatively large particle size is reduced. The amount is gradually increasing. However, in order to improve the productivity by efficiently performing the sintering reaction in the DL-type sintering process and to produce sinter of good quality, ventilation is required so that an appropriate amount of air flows inside the raw material layer. It is important to ensure the nature. Therefore, it is necessary to minimize the fine powder ratio in the sintering raw material, and when using an iron ore with a very high fine powder ratio, such as fine iron ore produced through a beneficiation process of iron ore, A separate pretreatment is required to produce a granulated product and use it as a sintering raw material.

  Further, in the sintering process, the strength of the granulated material has a great influence on the air permeability of the sintered layer in addition to the particle size distribution of the granulated material. Therefore, there is a demand for a method that can be manufactured so that the granules have strength enough to withstand mechanical and thermal shocks received in the course of transportation, charging, and firing.

  The present invention provides a granulated product manufacturing apparatus capable of ensuring the strength of a granulated material and ensuring air permeability in a raw material layer, a sintered ore manufacturing apparatus including the same, and a sintered ore manufacturing method. The purpose is to do.

  An apparatus for producing a granulated product according to the present invention includes a molding device having a pair of first rolls that form a space into which a raw material is injected and are separated so that a plate-like molded body can be produced; And a crusher having a pair of second rolls separated so as to form a space into which the water flows.

  The molding machine is characterized by including an injector for injecting the raw material under pressure between the pair of first rolls.

  A protrusion is formed on the outer peripheral surface of the second roll.

  The separation distance between the second rolls is shorter than the separation distance between the first rolls.

  The crusher is disposed immediately below the forming device, and the pair of first rolls and the pair of second rolls are so arranged that the formed body manufactured in the forming device is sandwiched between the pair of second rolls. A pair of second rolls are arranged side by side.

  The apparatus for manufacturing a sintered ore of the present invention is an apparatus for manufacturing a sintered ore, and mixes a first iron ore, an auxiliary raw material, and a fuel to manufacture a first compounded raw material. A first pre-treatment unit capable of producing a first granulated product by combining the blended raw materials, and a second blended raw material including a second iron ore, a powder raw material and a fuel, and compression-molded to form a compact. And a second pre-processing unit capable of manufacturing and crushing the molded body to produce a second granulated product.

  A sorter capable of sorting the first iron ore in particle size is provided.

  The second pretreatment unit includes a first mixer that can produce the second compounded raw material by mixing the second iron ore, the auxiliary raw material, and the fuel.

  The second pre-processing unit, a molding device having a pair of first rolls spaced to form a space into which the second compounding material is injected, and a lower part of the molding device, And a crusher having a pair of second rolls provided separately.

  The molding machine is provided with an injector for injecting the second compounding material under pressure between the pair of first rolls.

  A protrusion is formed on the outer peripheral surface of the second roll.

  The separation distance between the second rolls is shorter than the separation distance between the first rolls.

  A second mixer for mixing the first granulated material and the second granulated material is provided.

  Further, the method for producing a sintered ore of the present invention is a method for producing a sintered ore, wherein a first compounded material containing a first iron ore, an auxiliary material and a fuel is combined to form a first granulated material. Manufacturing a second granulated material by molding and crushing a second compounded raw material including a second iron ore, an auxiliary material, and a fuel; and forming the first granulated material and the second granulated material. Charging the second granulated material into the sintering cart.

  The method includes the step of grain-size-selecting the first iron ore, and the step of grain-size-selecting the first iron ore includes the step of including iron ore having a particle diameter of 3 mm or less in a second compounding raw material. It is characterized by.

  The step of preparing the second compounding material includes a step of charging a binder.

  The step of producing the second granulated product includes a step of compression-molding the second compounding raw material to produce a plate-like molded body, and a step of crushing the plate-like molded body to form a second granular material. And a step of producing a granulated product.

  In the process of crushing the compact, the size of the second granulated material is adjusted.

  The method may further include a step of mixing the first granulated material and the second granulated material before charging the sintering cart.

  ADVANTAGE OF THE INVENTION According to this invention, the productivity of a granulated material is improved by compression-molding the compounding raw material containing fine iron ore to produce a compact, and crushing the compact to produce a granular granule. Physical properties suitable for the production of sintered ore can be ensured. When sinter is produced using the granules thus produced, sintering productivity and quality can be improved because air permeability in the raw material layer can be ensured.

It is a schematic diagram showing the composition of the manufacture device of the sintered ore concerning the embodiment of the present invention. It is a schematic diagram showing composition of a manufacturing device of a granulated product concerning an embodiment of the present invention. It is a flow figure showing sequentially the manufacturing method of the sintered ore concerning the embodiment of the present invention. It is the schematic which shows the method of manufacturing a granulated material using the manufacturing apparatus of the granulated material which concerns on embodiment of this invention. It is a graph which shows and compares productivity according to the kind of granulated material. It is a graph which shows the distribution of the particle diameter of the granulated material according to the distance between the rolls of a crusher. It is a graph which shows and compares initial strength according to the kind of granulated material. It is a graph which shows and compares the compressive strength according to the kind of granulated material. It is a graph which compares and shows the moisture resistance intensity according to the kind of granulated material. It is a graph which compares and shows the flow velocity of the air which passes through a raw material layer according to the kind of granulated material.

Hereinafter, the present invention will be described in detail with reference to the drawings. However, the invention is not limited in any way to the embodiments disclosed below, but may be embodied in various different forms, which merely complete the disclosure of the invention and entail ordinary knowledge. It is provided in order to give the holder a complete understanding of the scope of the invention.

  FIG. 1 is a schematic diagram illustrating a configuration of a sinter ore manufacturing apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic diagram illustrating a configuration of a granulated product manufacturing apparatus according to an embodiment of the present invention. is there.

  As shown in FIG. 1, a sinter ore manufacturing facility according to an embodiment of the present invention includes a plurality of sintering carts which are arranged in one direction and are formed so as to be movable, and are provided with a space in which a space for heat treatment of a compounding material is provided. 200, a movement path 120 for forming a closed loop so that the sintering truck 200 rotates in an endless manner, and an ignition furnace 130 for injecting a flame into the compounding material charged in the sintering truck 200. . In addition, the sinter production facility uses the first compounding material containing the first iron ore to produce a first pre-treatment unit 300 for producing a first granulated product and a second iron ore. A second pre-processing unit 400 for producing a second granulated product, and a raw material for charging the first granulated product and the second granulated product into the sintering cart 200 using the second blended raw material including A supply unit 110 is provided.

  The moving path 120 forms a closed loop so that the sintering truck 200 rotates in an endless track system, and the upper moving path where the charging and sintering of the raw material are performed, and the sintered ore that has been sintered is discharged. The empty sintering truck 200 has a lower moving path that moves to an upper moving path for the sintering process. The upper moving path is provided with a raw material supply section for charging the raw material to the sintering cart 200, an ignition section, and a sintering section, and the lower moving path is sintered for the next sintering step. This is a forwarding section in which the bogie 200 moves. At this time, the section that is switched from the upper movement path to the lower movement path is an ore discharging section 126 from which the sintered ore is discharged. A crushing device 140 for crushing the sintered ore discharged from the sintering bogie 200 and a cooling device 150 for cooling the crushed sintered ore are provided on one side of the discharging portion 126. .

  The raw material supply unit 110 is provided on one side of the upper moving path, and the ignition furnace 130 is provided in front of the raw material supply unit 110 with respect to the moving direction of the sintering cart 200. In addition, a plurality of wind boxes 121 are provided below the upper moving path so as to suck the inside of the sintering truck from the lower part of the ignition section to the sintering section. The wind box 121 forms a negative pressure and sucks the inside of the sintering cart 200 to form a flow of air from the upper part to the lower part of the raw material layer inside the sintering cart 200 to sinter the raw material. I do.

  A duct 122 is connected to an end of the wind box 121, and a blower 124 is disposed at an end of the duct 122, and a negative pressure is formed inside the wind box 121 so that the inside of the sintering cart 200 can be sucked. It has become. A dust collector 123 is provided in the duct 122 in front of the blower 124, and filters impurities in exhaust gas sucked through the wind box 121 and discharges the impurities through a chimney 125. The wind box 121 sucks outside air to enable ignition of the surface layer of the sintering raw material and combustion of the sintering raw material, thereby enabling sinter ore to be produced.

  The first pre-processing unit 300 and the second pre-processing unit 400 granulate to a size suitable for sinter production according to the particle size of iron ore in the raw material for producing sinter. Has a role. At this time, the first pre-processing unit 300 may combine the first compounding raw materials including the first iron ore of 10 cm or less with each other to produce a first granulated product, for example, a pellet. The second pretreatment unit 400 may produce a second granular material in a granular form by compressing and then crushing a second compounded raw material containing a second iron ore of 100 μm or less.

  The first pre-processing unit 300 mixes the first iron ore, the auxiliary material, and the fuel material with the plurality of first hoppers 310 that store the first iron ore, the auxiliary material, and the fuel material, and And a granulator 330 that combines the first blending raw material to produce a first granulated product. The first pre-processing unit 300 is substantially the same as an existing apparatus that manufactures a granulated product while mixing and stirring the blended raw materials. That is, the first pre-processing unit 300 uniformly mixes the first iron ore having a particle size of 10 cm or less, an auxiliary material such as limestone, and a fuel material such as coke in the first mixer 320. The first compounding raw material is manufactured, and in the granulator 330, the first iron ore, the auxiliary raw material, and the fuel material are combined with each other by stirring while adding moisture to the first compounding raw material, thereby forming a pellet. A first granulated product such as is manufactured.

  In addition, the second pre-processing unit 400 mixes the second iron ore, the auxiliary material, and the fuel material with the plurality of second hoppers 410 that store the second iron ore, the auxiliary material, the fuel material, and the binder. A second mixer 420 for producing a second blended raw material and a granulator for producing a second granulated product using the second blended raw material.

  As shown in FIG. 2, the granulating apparatus includes a molding machine 430 for compression-molding the second compounding raw material to produce a plate-type molded body, and a plate-shaped molded body produced by the molding machine 430. And a crusher 440 for crushing to produce a second granular material in the form of particles.

  The forming device 430 includes a twin-roll type compressor having a pair of first rolls 432. At this time, the pair of first rolls 432 are arranged so as to be separated from each other so as to form a space into which the second compounding material is injected. Further, the molding device 430 includes a container 433 in which the second compounding material is accommodated, an injector 434 provided inside the container 433 and capable of injecting the second compounding material between the first rolls 432, It has. The injector 434 pressurizes and injects the second compounding material between the first rolls 432 so that the molding machine 430 can produce a high-density compact. For example, the injector 434 includes a screw feeder that can press-inject the second compounding material between the first roll 432 and the top of the molding device 430.

  The crusher 440 includes a pair of second rolls 442 arranged so as to be separated from each other so as to form a space in which the molded body is sandwiched.

  The crusher 440 is provided immediately below the molding device 430 so that the molded body manufactured in the molding device 430 can be crushed in real time. In this case, the second roll 442 of the crusher 440 is arranged so as to be lined with the first roll 432 so that the compact produced by the first roll 432 of the compactor 430 is sandwiched therebetween. A guide plate 446 for preventing the molded body from being detached is provided above the second roll 442. At this time, if the interval D2 between the second rolls 442 is wider than or equal to the interval D1 between the first rolls 432, the compact cannot be crushed. Is preferably set smaller than the interval between the first rolls 432. The molded body manufactured by the molding machine 430 becomes thinner while being sandwiched between the second rolls 442 constituting the crusher 440 in an uncured state. The second granulated product manufactured in this manner is pressurized twice, and thus can have higher strength than a molded product. Using such a principle, a compressor (not shown) for compressing the compact produced in the compactor 430 is further provided between the compactor 430 and the crusher 440. In this case, the compressor may include a pair of rolls disposed apart from each other, as in the case of the forming unit 430, and the interval between the rolls is smaller than the interval between the first rolls 432. And, it is larger than the interval between the second rolls 442.

  Further, the second roll 442 has a protrusion 444 on the outer peripheral surface so that the molded body can be easily crushed. The protrusions 444 are provided on the outer peripheral surface of the second roll 442 so as to have a certain distance D3. At this time, the distance between the protrusions 444 is such that the second granulated material manufactured by crushing the compact is manufactured. May affect the determination of the size of the image. The protrusions 444 may be formed in various shapes, for example, formed in a lattice shape so that a formed body can be crushed to produce a second granular material having a length, a width, and a thickness. May be done. The size of the second granulated product may be adjusted by the distance between the second rolls 442 or the size of the protrusion 444 formed on the outer peripheral surface of the second roll 442.

  On the other hand, the sinter production facility according to the embodiment of the present invention further includes a separator 500. The sorter 500 can sort iron ores having a particle size of a specific size or less, for example, 1 mm or less or 3 mm or less from the first iron ore. The iron ore sorted in the sorter 500 is provided to the second pre-processing unit 400 and can be used for producing a second granulated material together with the second iron ore.

  Further, the raw material supply unit 110 is a surge hopper that stores the first granulated material manufactured in the first pre-processing unit 300 and the second granulated material manufactured in the second pre-processing unit 400 114, an upper ore hopper 112 for storing the upper ore, and a charging device 116 for charging the blended raw material and the upper ore to the sintering cart 200. At this time, the first granulated material and the second granulated material are stored in the surge hopper 114 after being mixed in another mixer (not shown).

  Hereinafter, the method for producing a sintered ore according to the present invention will be described.

  FIG. 3 is a flow chart sequentially showing a method for producing a sintered ore of the present invention, and FIG. 4 is a conceptual diagram showing a method for producing a granulated material using a granulated material producing apparatus.

  As shown in FIG. 3, the method for producing a sintered ore according to the present invention includes a step of preparing a first iron ore (S110) and a first blending of a first iron ore, an auxiliary material and a fuel material. A step of producing a raw material (S114), a step of combining a first compounded raw material to produce a first granulated product (S116), a step of preparing a second iron ore (S120), and a step of preparing a second iron ore. Preparing a second compounding material by mixing the iron ore, the auxiliary material, the fuel substance, and the binder (S122), and compressing the second compounding material to produce a plate-shaped compact (S124) ), A step of crushing the formed body to produce a second granulated particle (S126), and charging the first granulated substance and the second granulated substance into a sintering cart (S130). And sintering (S140). At this time, after the step of preparing the first iron ore, the method includes a step (S112) of particle size sorting of the first iron ore having a specific size, for example, a size of 3 mm or less from the first iron ore. May be. Here, the sorted first iron ore having a size of 3 mm or less may be used in producing the second granulated product.

  First, the first iron ore is fine iron ore having a size of 10 cm or less. The first iron ore can be used in producing a first granulated product, and if necessary, iron ore having a size of 1 mm or less or 3 mm or less is subjected to particle size sorting from the first iron ore. To the second pre-processing unit 400 for producing the second granulated product.

  When the first iron ore is prepared, the first iron ore is charged into the first mixer 320 together with the auxiliary material such as limestone and the fuel substance, and then uniformly mixed to produce a first compounded raw material. When the first compounding raw material is manufactured, the first compounding raw material is charged into the granulator 330, and the first iron ore, the auxiliary material, and the fuel material are combined with each other by stirring while adding moisture to form a pellet. A first granulated product such as is manufactured.

  The second iron ore is fine iron ore having a size of 100 μm or less. The second iron ore can be used in producing the second granulate, and can be used in the production of the second iron ore alone or in a 1 mm particle size-selected from the second iron ore and the first iron ore. The second granulated product is mixed with iron ore having a particle size of 3 mm or less. When the second iron ore is prepared, the second mixed raw material is manufactured by charging the secondary raw material such as limestone and the fuel material such as coke and the binder into the second mixer 420 and mixing them uniformly. I do. At this time, the binder contains at least one of molasses, quicklime (CaO), and moisture.

  If the second compounding raw material is manufactured, the second granulated material in the form of irregular particles can be manufactured in the granulated material manufacturing apparatus. The second compounding raw material is pressure-injected into the forming device 430 using the injector 434, and the forming device 430 press-molds the second compounding material using the second roll 442 to form a plate-like material. A molded article can be manufactured. The molded body manufactured in this manner can have a thickness corresponding to the interval between the second rolls 442. If a molded body is manufactured using such a method, since the action of a force in the direction opposite to the rotating direction of the forming roll is not required when manufacturing briquettes, the production speed is relatively higher than when manufacturing briquettes. And a plate-like molded body having uniform strength can be manufactured.

  The compact is supplied to a crusher 440 below the compactor 430, and the compact is formed by a protrusion 444 formed on the outer peripheral surface of the second roll 442 while passing through the second roll 442 of the crusher 440. It is crushed to produce a second granular material in the form of particles. At this time, since the compact is crushed while being pressed again by the second roll 442, the second granulated material has a higher compressive strength than the compact.

  When the second granulated product is manufactured, the second granulated product is stored in the surge hopper 114 of the raw material supply unit 110 together with the first granulated product manufactured in the first pre-processing unit 300. At this time, the first granulated material and the second granulated material may be mixed in a separate mixer and then stored in the surge hopper 114, or may be separately stored in different surge hoppers. Good.

  Next, the upper ore, the first granulated material, and the second granulated material are charged into the sintering truck 200 moving along the moving path 120 using the charging device 116 to form a raw material layer. Then, in the sintering cart 200, the surface portion of the raw material layer is ignited while passing through the moving path 120, and the raw material layer is sintered.

  When sinter is manufactured by such a method, the following tests are performed to confirm the possibility of improving the process efficiency and productivity, and the test results are shown in FIGS. 5 to 10.

  FIG. 5 is a graph showing the productivity according to the type of granulated material in comparison, and FIG. 6 is a graph showing the distribution of the particle size of the granulated material according to the distance between the rolls of the crusher. FIG. 7 is a graph showing a comparison of the initial strength according to the type of granulated material, and FIG. 8 is a graph showing a comparison of the compressive strength according to the type of the granulated material. FIG. 10 is a graph showing a comparison of the moisture resistance strength according to the type of granulated material, and FIG. 10 is a graph showing a comparison between the flow rates of air passing through the raw material layer according to the type of the granulated material. is there.

[Preparation of iron ore]
For the test, iron ore used as a raw material for sinter was prepared. The chemical composition and particle size of the iron ore used in the test are shown in Table 1 below.

  The iron ore A is a typical fine iron ore for sintering, and corresponds to the first iron ore described above. The iron ore B is a hematite-based fine ore (or pellet feed), and has a very high fines ratio (particle size: 0.15 mm or less) of about 90% by weight. Iron ore B corresponds to the second iron ore.

[Production of granulated material]
Iron ore A was manufactured into a first granulated product using the first pre-processing unit 300, and iron ore B was manufactured into a second granulated product using the second pre-processing unit 400. At this time, the first granulated product manufactured using the first pre-processing unit 300 is referred to as STD. In producing the first and second granules, at least one of an auxiliary material, a fuel substance, moisture and a binder was used.

  The second granulated product is manufactured using the second pre-processing unit 400 according to the embodiment of the present invention, and at this time, the distance between the first rolls 432 of the forming device 430 is adjusted to 1 cm and 2 cm, respectively. After producing a plate-like compact, the second granules are produced by crushing the compact by adjusting the interval between the second rolls 442 of the crusher 440 to a range of 1 to 2 cm. did. At this time, the granulated product manufactured by crushing the formed body manufactured by adjusting the first roll 432 to 1 cm is referred to as PA1, and is formed by adjusting the first roll 432 to 2 cm. The granulated product produced by crushing the body is referred to as PA2.

  Briquettes and pellets were manufactured using iron ore B in order to confirm the physical properties of the second granulated product and the possibility of improving the sintering operation using the same.

  Briquettes are manufactured to have a volume of 0.5 cc, 1.0 cc and 2.0 cc and are referred to as B1, B2 and B3, respectively. The pellets are manufactured to have a size of 1 cm and 2 cm in diameter, and are referred to as P1 and P2, respectively.

[Manufacture of sintered ore]
A sample was manufactured using the first granulated material and the second granulated material, and a sintered ore was manufactured using the sample.

  Sample 1 was manufactured to 30 kg of the first granulated product. Then, the sample 1 was charged into a sintering pot having a diameter of 150 mm to form a raw material layer, and after igniting the surface layer of the raw material layer, sintering was performed at a lower portion of the sintering pot with a pressure of 1,500 mmAq. went.

  Sample 2 was manufactured to 30 kg of a mixture of the first granulated product and briquette B1. Then, the sample 2 was charged into a sintering pot having a diameter of 150 mm to form a raw material layer, and after igniting the surface layer of the raw material layer, sintering was performed at a lower portion of the sintering pot with a pressure of 1,500 mmAq. went.

  Sample 3 was manufactured to 30 kg of a mixture of the first granulated product and briquette B2. Then, the sample 3 was charged into a sintering pot having a diameter of 150 mm to form a raw material layer, and after igniting the surface layer of the raw material layer, sintering was performed at a lower portion of the sintering pot with a pressure of 1,500 mmAq. went.

  Sample 4 was manufactured to 30 kg of a mixture of the first granulated product and briquette B3. Then, the sample 4 was charged into a sintering pot having a diameter of 150 mm to form a raw material layer, and a surface layer of the raw material layer was ignited. Then, sintering was performed at a lower portion of the sintering pot with a pressure of 1,500 mmAq. went.

  Sample 5 was manufactured to 30 kg of a mixture of the first granulated product and the second granulated product PA1. Then, the sample 5 was charged into a sintering pot having a diameter of 150 mm to form a raw material layer, and after igniting the surface layer of the raw material layer, sintering was performed at a lower portion of the sintering pot with a pressure of 1,500 mmAq. went.

  Sample 6 was manufactured to 30 kg of a mixture of the first granulated product and the second granulated product PA1. Then, the sample 6 was charged into a sintering pot having a diameter of 150 mm to form a raw material layer, and after igniting a surface layer of the raw material layer, sintering was performed at a lower portion of the sintering pot with a pressure of 1,500 mmAq. went.

  The iron ore A and the iron ore B used in producing the samples 2 to 6 were used in a weight ratio of 8: 2.

[Test results]
First, when producing a granulated product using iron ore B, the production speed was compared between the case of producing a briquette and the case of producing a second granulated product according to the embodiment of the present invention.

  As shown in FIG. 5, when producing briquettes using iron ore B, the production per hour increases as the volume of briquettes increases. In addition, in a case where a plate-like compact is manufactured according to the embodiment of the present invention, and then a second granulated product is manufactured by crushing using a crusher, rather than manufacturing briquettes using iron ore B. Shows that the production per hour increases. In addition, when manufacturing the second granulated product, when the distance between the first rolls of the forming device is increased, it can be understood that the production amount increases rapidly.

  From this, the method of producing a powdery iron ore into a molded body according to the embodiment of the present invention, and crushing the molded body to produce a particulate granulated product is more preferable by using a powdery iron ore. It can be seen that the productivity is better than when briquettes having a predetermined shape are manufactured.

  Next, when manufacturing the second granulated material using the iron ore B, if the distance between the second rolls 442 of the crusher 440 is adjusted, the weight according to the particle diameter of the second granulated material is adjusted. The ratio was examined. As is clear from FIG. 6, the compact was crushed while the distance between the second rolls 442 was changed within a range of 1 to 2 cm to produce a second granulated product. The average particle size and distribution of the second granulated material can be adjusted according to the distance of the second granulated material. For example, when increasing the distance between the second rolls 442, the size of the second granulated material may be increased according to the interval between the second rolls 442. However, the distance between the second rolls 442 and the size of the second granulated material are not always proportional.

  The initial strengths of the granules produced using iron ore B, ie, briquettes and the second granules were compared. As apparent from FIG. 7, the initial strength of briquettes B2 and B2 having a relatively large briquette volume is higher than the briquette B1 having the smallest briquette volume. However, as the volume of the briquette increases, the initial strength of the briquette does not always increase. Further, in the case of the second granulated material manufactured according to the embodiment of the present invention, when the distance between the first rolls 432 is 1 cm, it is higher than when the distance between the first rolls 432 is 2 cm. Has initial strength. Here, in the case of the second granulate manufactured according to the embodiment of the present invention, regardless of the volume of the briquette, it has a similar or high initial strength, and in particular, between the first roll 432. It is understood that the strength of the second granulated product can be remarkably increased by appropriately adjusting the interval.

  Next, among the second granules produced using the iron ore B, the compressive strengths of the second granules having a size of 10 mm and the briquettes B1, B2, B3 were compared. As is clear from FIG. 8, the second granules PA1 and PA2 have a higher compressive strength than the briquette B1 having the smallest volume, and have a compressive strength similar to that of the briquettes B2 and B3. At this time, the compressive strength of the second granulated product PA2 manufactured using the forming device 430 in which the distance between the first rolls 432 is relatively long is greater than the compressive strength of the second granulated product PA1. It appears to be low, but has a higher or similar compressive strength compared to briquettes B2 and B3.

  Further, the moisture resistance of the pellets P1, P2, briquettes B1, B2, B3 and the second granules PA1, PA2 produced using the iron ore B were measured. The moisture resistance strength indicates whether or not the pellets, briquettes, and second granules can maintain strength in a slurry region where moisture is condensed in the process of producing a sintered ore. As is clear from FIG. 9, the moisture resistance strength of the briquettes B1, B2, B3 and the second granules PA1, PA2 appeared higher than the pellets P1, P2. At this time, it can be seen that the second granules PA1 and PA2 have lower moisture resistance strength than the briquettes B1, B2 and B3, but have substantially similar or higher moisture resistance strength.

  Then, when producing a sintered ore using the first granulated product produced using the iron ore A and the pellets, briquettes and the second granulated product produced using the iron ore B, The air permeability in the raw material layer charged in the tying car was measured.

  As is clear from FIG. 10, when a first granulated product manufactured using iron ore A, that is, a sintered ore is manufactured using the first sample, the first granulated product and briquette The air permeability in the raw material layer is much lower than when sinter is manufactured using B1, B2, B3 and the second granules PA1, PA2. That is, if the sintering step is performed by mixing the briquette or the second granulated material together with the first granulated material, the voids in the raw material layer can be reduced more than when performing sintering using the first granulated material. Are secured and the air permeability is improved.

  Furthermore, when sintering is performed using the first granules and the second granules PA1 and PA2, the sintering is performed using the first granules and the briquettes B1 having the smallest volume. It can also be seen that the air permeability in the raw material layer was improved. And when sintering using a 1st granulated material and 2nd granulated material PA2 rather than when performing sintering using a 1st granulated material and 2nd granulated material PA1. It can be seen that the better the air permeability in the raw material layer. The reason that such a result appears is that the volumes of the second granules PA1 and PA2 are larger than the volume of the briquettes B1, and the size of the second granules PA2 is that of the second granules PA1. It is suggested that as the particle size or volume of the raw material used for sintering increases, it is advantageous to secure the gas permeability of the raw material layer.

  As is clear from the results, when the sintered ore is manufactured using the method for manufacturing a sintered ore according to the embodiment of the present invention, a granulated material using fine iron ore, that is, a second granulated material is used. Production efficiency is improved. In addition, the fine iron ore is manufactured into a second granulated material having a compressive strength, a moisture resistance strength, and the like suitable for the production of a sintered ore, and the size of the second granulated material is adjustable. Thus, sintering productivity and sinter quality can be improved by improving air permeability during the sintering process.

  As described above, specific embodiments have been described in the detailed description of the present invention, but various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be defined not only by the claims but also by the equivalents of the claims.

  The apparatus for manufacturing a granulated product, the apparatus for manufacturing a sintered ore provided with the same, and the method for manufacturing a sintered ore according to the present invention can secure air permeability in a raw material layer when manufacturing a sintered ore. Productivity and quality can be improved.

Claims (19)

A forming device having a pair of first rolls formed to form a space into which the raw material is injected and separated so that a plate-shaped formed body can be manufactured;
A crusher having a pair of second rolls separated so as to form a space into which the molded body flows,
An apparatus for producing a granulated product, comprising:   2. The apparatus according to claim 1, wherein the forming device includes an injector configured to press-inject the raw material between the pair of first rolls. 3.   The apparatus according to claim 2, wherein a protrusion is formed on an outer peripheral surface of the second roll.   The apparatus according to claim 3, wherein a separation distance between the second rolls is shorter than a separation distance between the first rolls. The crusher is disposed immediately below the forming device,
The pair of first rolls and the pair of second rolls are arranged so that the pair of first rolls and the pair of second rolls are arranged so that the formed body manufactured in the forming device is sandwiched between the pair of second rolls. An apparatus for producing a granulated product according to claim 4, characterized in that: An apparatus for producing sintered ore,
A first pretreatment unit that mixes the first iron ore, the auxiliary raw material, and the fuel to produce a first blended raw material, and combines the first blended raw material to produce a first granulated product; ,
A second pretreatment capable of compression-molding a second blended raw material including a second iron ore, a powder raw material and a fuel to produce a compact, and crushing the compact to produce a second granulated product Department and
An apparatus for producing a sintered ore, comprising:   The sinter ore manufacturing apparatus according to claim 6, further comprising a sorter capable of sorting the first iron ore in particle size. The second pre-processing unit includes:
The sinter ore manufacturing apparatus according to claim 7, further comprising a first mixer capable of manufacturing the second compounded raw material by mixing the second iron ore, the auxiliary raw material, and the fuel. The second pre-processing unit includes:
A forming device having a pair of first rolls separated so as to form a space into which the second compounding material is injected;
A crusher disposed at a lower portion of the forming device and having a pair of second rolls spaced apart from each other;
The sinter ore manufacturing apparatus according to claim 8, comprising:   The sinter ore manufacturing apparatus according to claim 9, wherein the forming device includes an injector configured to press-inject the second compounding material between the pair of first rolls.   The apparatus according to claim 10, wherein a protrusion is formed on an outer peripheral surface of the second roll.   The apparatus according to claim 11, wherein a separation distance between the second rolls is shorter than a separation distance between the first rolls.   13. The apparatus according to claim 12, further comprising a second mixer for mixing the first granulated material and the second granulated material. A method for producing a sintered ore,
Combining a first blended material including a first iron ore, an auxiliary material and a fuel to produce a first granulated product;
Forming and crushing a second compounded raw material including a second iron ore, an auxiliary material and a fuel to produce a second granulated material;
Charging the first granulated material and the second granulated material into a sintering cart;
A method for producing a sintered ore, comprising: Including the step of particle size sorting the first iron ore,
The method for producing a sintered ore according to claim 14, wherein in the step of grain-size-selecting the first iron ore, a step of including an iron ore having a particle diameter of 3 mm or less in a second compounding raw material is included. .   The method for producing a sintered ore according to claim 15, wherein the step of preparing the second compounding material includes the step of charging a binder. The step of producing the second granulated product comprises:
A step of compression-molding the second compounding raw material to produce a plate-like molded body;
A step of crushing the plate-like compact to produce a particulate second granulated product;
17. The method for producing a sintered ore according to claim 16, comprising:   18. The method for producing a sintered ore according to claim 17, wherein in the step of crushing the compact, the size of the second granulated product is adjusted. Before the process of charging the sintering cart,
The method for producing a sintered ore according to claim 18, comprising a step of mixing the first granulated material and the second granulated material.

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