WO2020130386A1 - Sintered ore manufacturing apparatus, sintered ore manufacturing method, sintered ore, and charging material for manufacturing sintered ore - Google Patents

Abstract

Introduced is a sintered ore manufacturing apparatus comprising: a mixture-producing unit for producing a mixture by mixing a first mixed raw material containing iron ore powder; a pellet fabrication unit for fabricating pellets by mixing and assembling a second mixed raw material containing fine iron ore; a molded body fabrication unit for fabricating a molded body having a greater particle size or a greater density than the mixture through compression-molding of the pellets; a charging unit which is formed in the shape of a cycloidal curve, and which drops the mixture and the molded body such that bottom charging of the molded body having the greater particle size or greater density than the mixture can be preferentially induced; and a sintering trailer, into which the mixture and the molded body are charged, arranged under the charging unit.

Description

Sinter ore manufacturing equipment, sinter ore manufacturing method, sinter ore and charge for manufacturing sinter ore

The present invention relates to a sintered ore manufacturing apparatus, a sintered ore manufacturing method, a sintered ore and a charge for manufacturing the sintered ore. More specifically, the molded body containing the fine iron ore is loaded into the sintered bogie together with the blended raw material containing the iron ore, but the molded body having a large particle size is induced to be preferentially charged to the lower portion in the sintered bogie to improve air permeability during sintering. The present invention relates to a sintered ore manufacturing apparatus and a method for manufacturing a sintered ore, and thus a charge for manufacturing the sintered ore and the sintered ore.

The sintering ore manufacturing process for sintering the fine iron ore to a size suitable for blast furnace use is mainly a Dwight-Lyoid (hereinafter referred to as "DL") sintering process capable of mass production. In this DL-type sintering process, iron ore, auxiliary materials and fuel (powder coke, anthracite) are put in a drum mixer to be mixed and humidified (approximately 7 to 8% by weight of raw material) to pseudo-particle the sintered blended raw material to balance the sintering machine. Charge to a certain height on the bed.

Then, after the surface is ignited by the ignition furnace, firing of the sintered blended raw material proceeds while forcibly sucking air from below and sintered ore is produced. After the sintering is completed, the sintered ore is cooled in a cooler through a crusher of the light distribution unit, and is classified into a particle size of 5 to 50 mm, which is easy to charge and react in the blast furnace, and is transferred to the blast furnace.

On the other hand, in the production of sintered ore, the use of low-grade iron ore with a high fineness ratio of 0.10 mm or less is gradually increasing as the high-quality iron ore with a high iron content and a relatively large particle size decreases. However, in order to improve the productivity by efficiently proceeding the sintering reaction in the DL-type sintering process, and to produce a good quality sintered ore, it is important to ensure air permeability so that an appropriate amount of air flows through the layer.

Therefore, it is necessary to minimize the fineness ratio among the sintered raw materials, and when iron ore having a very high fineness ratio, such as fine iron ore produced through the beneficiation process of iron ore, is used as a sintered raw material, it is manufactured as an assembly through a separate pre-treatment. It is common.

In addition, in the sintering process, in addition to the particle size distribution of the pseudo particles, the strength greatly affects the breathability of the sintered layer. Therefore, there is a need for a method that can be manufactured to have a strength that can withstand mechanical, thermal shock, etc. that the assembly receives during transport, loading, and firing.

In the present invention, the molded body containing the fine iron ore is loaded into the sintered bogie together with the blended raw material containing the iron ore, but it is possible to improve the air permeability during sintering by inducing that the molded body having a large particle size is preferentially charged to the lower portion in the sintered bogie. It provides a sintered ore manufacturing apparatus and a method for manufacturing the sintered ore, and thus provides a charge for manufacturing the sintered ore and the sintered ore.

An apparatus for manufacturing a sintered ore according to an embodiment of the present invention includes a mixture manufacturing unit for mixing a first mixture raw material containing iron ore to prepare a mixture; Pellet production unit for producing a pellet by mixing and assembling a second blend raw material containing fine iron ore; A molded product manufacturing unit for compression molding the pellet to produce a molded body having a larger particle size or density than the mixed body; A charging unit formed in a cycloidal curved shape, and dropping the mixture and the molded body to induce preferential lower charging of the molded body having a larger particle size or density than the mixed body; And a sintered bogie which is disposed below the charging unit and into which the mixed body and the molded body are charged.

The charging unit, with respect to the total height 100% of the charge for manufacturing the sintered ore loaded into the sintered bogie, 90% by weight or more of the molded body may be positioned at a height of 40% or less from the inner lower surface of the sintered bogie.

The mixture manufacturing unit includes a first storage bin in which the iron ore is stored, a first raw material supplying unit supplying the first mixing raw material; And a first mixer for mixing the first blended raw materials supplied from the first raw material feeder to prepare a mixed body.

The pellet manufacturing unit includes a second storage bin in which the fine iron ore is stored, a second raw material supplying unit for supplying the second blended raw material; A second mixer mixing the second blending raw material supplied from the second raw material supplying machine; And a pelletizer that assembles the second blending raw material supplied from the second mixer to manufacture the pellets.

The mixture manufacturing unit may further include a iron ore sorting machine for sorting the particle size of the iron ore supplied from the first storage bin and supplying the iron ore having a predetermined particle size or less to the second mixer.

The molded product manufacturing unit, a pair of compression rolls arranged side by side to compress the pellets; A pellet feeder disposed on the pair of compression rolls to supply the pellets between the pair of compression rolls; And a crusher for crushing pellets compressed through the pair of compression rolls to produce the molded body.

The molded body manufacturing unit may further include a pellet sorter for sorting the particle size of compressed pellets supplied from the pair of compressed rolls and supplying the compressed pellets having a predetermined particle size or less to the pellet feeder.

The molded body manufacturing unit may further include a molded body sorting machine for sorting the particle size of the molded body supplied from the crusher and supplying the molded body exceeding a predetermined particle size to the pellet feeder.

The charging unit comprises a plurality of charging rolls arranged side by side, and the central axis of the plurality of charging rolls may be arranged along a cycloidal curve.

The charging unit may include an integral charging suit formed as a curved surface along a cycloid curve.

A method for manufacturing a sintered ore according to an embodiment of the present invention comprises the steps of mixing a first blended raw material containing iron ore to prepare a mixture; Preparing a pellet by mixing and assembling a second blended raw material containing pulverized iron ore; Compression molding the pellet to produce a molded body having a larger particle size or density than the mixed body; And loading the mixture and the molded body into a sintered bogie, but preferentially loading a molded body having a larger particle size or density than the mixed body into the lower portion of the sintered bogie using a charging suit formed along a cycloid curve.

The manufacturing of the mixture may include supplying a first blended raw material containing iron ore, an auxiliary raw material, and fuel having a particle size of 10 mm or less; And mixing the first blended raw material through a first mixer to prepare a mixed body.

The manufacturing of the mixture may further include; selecting the particle size of the iron ore having a particle size of 10 mm or less and including the iron ore having a particle size of 3 mm or less in the second mixture raw material.

The manufacturing of the pellets may include: supplying a second blended raw material containing fine iron ore having a particle size of 100 μm or less, an auxiliary raw material, and a fuel; Mixing the second blending material through a second mixer; And manufacturing the mixed second blend raw material into pellets having a particle size of 30 mm or less.

The manufacturing of the molded body may include compressing the pellets using a pair of compression rolls arranged side by side; And crushing the compressed pellets to produce a molded body having a particle size of 4 cm or less.

The step of manufacturing the molded body may further include; selecting the particle size of the compression-molded pellets and supplying the compressed pellets having a particle size of 3 mm or less to the pair of compression rolls.

The step of manufacturing the molded body may further include the step of selecting the particle size of the molded body and supplying the molded body having a particle size exceeding 4 cm with the pair of compression rolls.

In the step of loading the mixture and the molded body into a sintered truck, with respect to 100% by weight of the sintered raw material containing the mixture and the molded body, the molded body may be 30% by weight or less.

In the step of loading the mixture and the molded body to the sintered bogie, 90% by weight or more of the molded body to a height of 40% or less from the inner lower surface of the sintered bore with respect to 100% of the total height of the mixed body and the molded body charged to the sintered bogie Can be located.

In the step of loading the mixed body and the molded body into the sintered bogie, the average particle size of the mixed body may be 10 mm or less, and the average particle size of the molded body may be 4 cm or less.

The sintered ore according to an embodiment of the present invention includes a low-reduction portion and a high-reduction portion, and the RI of the low-reduction portion is 65 to 70, and the RI of the high-reduction portion may exceed 70.

RI of the testicle may be 75 to 80 days.

The charge for manufacturing a sintered ore according to an embodiment of the present invention is a charge for manufacturing a sintered ore located in a sintered bogie, a mixture composed of a first blended raw material containing iron ore; And a molded body made of a second blended raw material containing pulverized iron ore and having a particle size or density greater than that of the mixed body; and including, at least 90% by weight of the molded body, the total height of the charge for manufacturing the sintered ore charged in the sintered bogie 100 With respect to %, it is located at a height of 40% or less from the inner lower surface of the sintered bogie.

The molded body may be 30% by weight or less with respect to 100% by weight of the charge for preparing the sintered ore.

In the case of a sintered ore manufacturing apparatus according to an embodiment of the present invention, the molded body containing the fine iron ore is loaded into the sintered bogie together with the blended raw material containing the iron ore, but the molded body having a large particle size or density is preferential to the lower portion in the sintered bogie. By inducing it to be charged, the air permeability is improved during sintering, and the effect of improving productivity as the combustion rate increases can be expected.

1 is a view showing a schematic view of a sintered ore manufacturing apparatus according to an embodiment of the present invention.

2 is a view showing a charging unit and a sintering bogie of a sintered ore manufacturing apparatus according to an embodiment of the present invention.

Fig. 3 is a diagram showing the equation (left) showing the correlation between the particle size and density of particles and the horizontal drop distance, and the segregation of the sintered raw material (right).

4 is a view showing the compressive strength of the raw material containing the fine iron ore.

5 is a view showing the charging of the sintered raw material according to the sintered ore manufacturing method according to an embodiment of the present invention.

6 is a view showing a state of a sintered ore according to an embodiment of the present invention.

7 is a chart comparing the sintered ore productivity, the degree of reduction and the generated slag volume in one example and a comparative example of the present invention.

Terms such as first, second and third are used to describe various parts, components, regions, layers and/or sections, but are not limited thereto. These terms are only used to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is only to refer to a specific embodiment and is not intended to limit the invention. The singular forms used herein also include plural forms unless the phrases clearly indicate the opposite. As used herein, the meaning of “comprising” embodies a particular property, region, integer, step, action, element, and/or component, and the presence or presence of another property, region, integer, step, action, element, and/or component. It does not exclude addition.

When one part is said to be "on" or "on" another part, it may be directly on or on the other part, or another part may be involved therebetween. In contrast, if one part is said to be "just above" another part, no other part is interposed therebetween.

Although not defined differently, all terms including technical terms and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention pertains. Commonly used dictionary-defined terms are additionally interpreted as having meanings consistent with related technical documents and currently disclosed contents, and are not interpreted as ideal or very formal meanings unless defined.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art to which the present invention pertains can easily practice. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

Sinter ore manufacturing equipment

The sintered ore manufacturing apparatus according to an embodiment of the present invention, as shown in FIGS. 1 and 2, is a mixture manufacturing unit for mixing a first mixture raw material containing iron ore, a second mixture raw material containing fine iron ore Pellet production unit for mixing and assembling pellets to produce pellets, compression molded pellets to produce molded bodies having a particle size or density greater than that of the mixture, formed along a cycloidal curve, charging unit and charging unit for dropping the mixture and the molded body It includes a sintered bogie, which is disposed below the unit and charged with a mixture and a molded body.

In the present specification, particle size may mean a diameter of particles. In some cases, the particle size can be understood as the mean particle size.

The mixture manufacturing unit prepares a mixture by mixing the first mixture raw material containing the iron ore. Specifically, the first compounding material may include iron ore, an auxiliary material and fuel having a particle size of 10 mm or less.

The mixture manufacturing unit includes a first storage bin in which the iron ore is stored, and a first mixer that mixes the first raw material feeder supplying the first raw material feed and the first raw material feed supplied from the first raw material feeder to manufacture the mixed material. It can contain.

In addition to the first storage bin in which iron ore particles with a particle size of 10 mm or less are stored, the first raw material feeder stores a first auxiliary storage bin in which by-products such as dust, water, slaked lime, limestone, tar, starch, and molasses are stored in a binder. It may further include a first fuel storage bin in which bins and buncokes or anthracite are stored.

The first mixer is connected to the first raw material feeder, and is supplied with iron ore, an auxiliary raw material, a binder, and fuel from the first raw material feeder to mix and assemble to manufacture a mixture. The first mixer may be composed of a two-stage mixer.

The pellet manufacturing unit prepares pellets by mixing and assembling a second blended raw material containing fine iron ore. Specifically, the second blended raw material may include fine iron ore having a particle size of 100 µm or less, an auxiliary raw material, and fuel.

The pellet manufacturing unit includes a second storage bin in which pulverized iron ore is stored, from a second raw material feeder for supplying the second raw material, and from a second mixer and a second mixer for mixing the second raw material supplied from the second raw material feeder. It may include a pelletizer for manufacturing a pellet by assembling the supplied second compounding material.

In addition to the second storage bin in which fine iron ore having a particle size of 100 µm or less is stored, the second raw material feeder may further include a second storage tank in which limestone is stored, a second fuel storage bin in which coke or anthracite is stored, and a binder storage bin in which coke is stored. Can.

The second mixer is connected to the second raw material feeder, and may serve to receive and mix pulverized iron ore, auxiliary raw materials, fuel, and binder from the second raw material feeder. The second mixer may be composed of a two-stage mixer.

The pelletizer may be manufactured in pellet form by assembling the mixed second blending raw material supplied from the second mixer in connection with the second mixer.

The second blended raw material is manufactured in pellet form using a pelletizer composed of a micro-pelletizer before compression molding to facilitate the use of fine powder, and in the future, during compression molding, the loading of the blended raw material is smooth You can do it.

Specifically, the mixture manufacturing unit may further include an iron ore sorter for sorting the particle size of the iron ore supplied from the first storage bin and supplying the iron ore having a predetermined particle size or less to the second mixer.

The iron ore sorter is connected to the first storage bin and the second mixer to select the particle size of the iron ore supplied from the first storage bin to the first mixer through a screen. When the predetermined particle size is 3 mm or less, the iron ore having a particle size of 3 mm or less can be supplied to the second mixer to be mixed together with the second blended raw material. Through this, it is possible to improve the efficiency of the use of iron ore having a fine particle size.

The molded body manufacturing unit compresses the pellets supplied from the pellet manufacturing unit to produce a molded body having a larger particle size or density than the mixed body.

Specifically, the molded body manufacturing unit is arranged side by side to compress the pellets through a pair of compression rolls, a pair of compression rolls disposed on top of the compression rolls to supply pellets between a pair of compression rolls and a pair of compression rolls It may include a crusher for crushing the pellets to prepare a molded body.

A pair of compression rolls are spaced apart from one another at regular intervals and may serve to compress pellets supplied therebetween. The shape of the molded body varies depending on the shape of the roll tire disposed on the outer side of the compressed roll. By applying a compacting type in which the molded body can be continuously discharged, it is possible to expect an effect of improving productivity compared to the pocket type.

The pellet feeder is connected to the pelletizer and is disposed on the top of the pair of compression rolls to supply the pellets supplied from the pelletizer between the pair of compression rolls. A pellet screw feeder may be further included to smoothly supply pellets between a pair of compression rolls.

Compressed pellets prepared through a pair of compression rolls can be crushed by being placed under a pair of extrusion rolls. Specifically, it can be crushed into a molded body having a particle size of 4 cm or less.

Specifically, the molded body manufacturing unit may further include a pellet sorter for sorting the particle size of compressed pellets supplied from a pair of compression rolls and supplying the compressed pellets having a predetermined particle size or less to a pellet feeder.

The pellet sorter is connected to a pair of compressed rolls and a pellet feeder to select the particle size of compressed pellets supplied from a pair of compressed rolls to a crusher through a screen. When a predetermined particle size is 3 mm, compressed pellets having a particle size of 3 mm or less can be compressed together with pellets supplied from a pelletizer by re-supplying them to a pellet feeder.

Through this, it is possible to improve the efficiency of the utilization of the second blended raw material containing fine iron ore.

In addition, the molded body manufacturing unit may further include a molded body sorting machine for sorting the particle size of the molded body supplied from the crusher and supplying the molded body exceeding a predetermined particle size to the pellet feeder.

The molded body sorting machine is connected to the crusher and the pellet feeder to screen the particle size of the compressed pellets supplied from the crusher to the charging unit through a screen. When the predetermined particle size is 4 cm, the molded body having a particle size exceeding 4 cm can be compressed with the pellet supplied from the pelletizer by supplying it again to the pellet feeder.

Through this, it is possible to improve the efficiency of the utilization of the second blended raw material containing fine iron ore. In addition, when the particle size of the molded body is too large and loaded into the sintered bogie, it is possible to prevent a phenomenon in which the heat transfer is not properly performed due to the size of the molded body and thus the firing is not sufficiently performed.

The charging unit is formed in the form of a cycloidal curve, and when the mixture and the molded body are dropped, the mixture and the molded body are guided to be charged by the sintering cart along the cycloidal curve.

When the mixture and the molded body fall to the sintered bogie along the cycloid curve, according to the principle of Figure 3 and the following formula, the larger the particle size or density, the horizontal dropping distance increases so that the molded body having a relatively large particle size or density of the particle is a mixed body. The horizontal drop distance may increase.

[expression]

(In the above formula, L means the horizontal drop distance, Ｕ means the horizontal departure speed, ρ _ｐ means the density of the particles, and d means the particle size. μ is the viscosity of the air in which the particles are present. Means.)

When the charging unit formed in the form of a cycloid curve is used, since the horizontal dropping distance of the molded body having a relatively large particle size or density increases, segregation charge of the sintered raw material containing the mixture and the molded body can be maximized.

The sintered raw material containing the mixed body and the molded body is charged in the form of horizontal segregation according to the above-described principle, but is loaded in the sintered bogie moving in the horizontal direction, so that the horizontal segregation can be converted to the vertical segregation form.

Accordingly, most of the molded body having a relatively large particle size or density may be located at the bottom of the inside of the sintered bogie, and most of the mixture having a relatively small particle size or density may be located at the top of the sintered bogie.

Specifically, 90% by weight or more of the molded body by the charging unit may be located at a height of 40% or less from the inner bottom surface of the sintered bore with respect to 100% of the total height of the mixed body and the molded body charged in the sintered bogie.

Accordingly, when the firing proceeds through the forced suction of air from below the sintered bogie, it is possible to expect an effect of improving the productivity of the sintered ore by increasing the combustion rate as air permeability is improved.

On the other hand, the charging unit comprises a plurality of charging rolls arranged side by side, and the central axis of the plurality of charging rolls may be arranged along a cycloidal curve.

A plurality of charging rolls are arranged side by side, and the rotational axes of the plurality of charging rolls are arranged along a cycloidal curve based on the side view, so that the mixture and the molded body can be induced to be charged by sintering along the cycloidal curve.

As another form, the charging unit may include an integral charging suit formed as a curved surface along a cycloid curve.

By using the integral charging suit formed as a curved surface along the cycloid curve, it is possible to induce the mixture and the molded body to be charged by the sintering cart along the cycloid curve.

Method for manufacturing sintered ore

The method for manufacturing a sintered ore according to an embodiment of the present invention comprises the steps of mixing a first blended raw material containing iron ore to prepare a mixture, mixing and assembling a second blended raw material containing fine iron ore to produce pellets, And compression molding the pellet to produce a molded body having a larger particle size or density than the mixed body, and charging the mixed body and the molded body into a sintered bogie using a charging suit formed along a cycloid curve.

First, in the step of manufacturing the mixed body, the first mixed raw material containing the iron ore is mixed to prepare the mixed body.

Specifically, the step of manufacturing a mixture includes supplying a first mixture raw material containing iron ore, sub-materials and fuel having a particle size of 10 mm or less and mixing the first mixture raw material through a first mixer to produce a mixture. can do.

After supplying the first blended raw material containing iron ore, sub-raw materials and fuel having a particle size of 10 mm or less, the supplied first blended raw material can be mixed and assembled to produce a mixture.

Next, in the step of manufacturing the pellets, the pellets are prepared by mixing and assembling the second blended raw material containing the fine iron ore.

Specifically, the steps of manufacturing the pellets include supplying a second blended raw material containing fine iron ore having a particle size of 100 µm or less, auxiliary materials and fuel, mixing the second blended raw material through a second mixer, and the mixed second. It may include the step of preparing the blended raw material into pellets having a particle size of 30 mm or less.

After supplying the second blended raw material containing fine iron ore, sub-raw material and fuel having a particle size of 100 μm or less, the blended raw material is mixed through a second mixer, and the second blended raw material mixed through a pelletizer has a particle size of 30 mm or less. Can be made into pellets.

The second blended raw material is manufactured in pellet form using a pelletizer composed of a micro-pelletizer before compression molding to facilitate the use of fine powder, and in the future, during compression molding, the loading of the blended raw material is smooth You can do it. In addition, since it has an effect similar to the two-stage compression, the molding strength may be increased.

On the other hand, the step of manufacturing the mixture may further include the step of selecting the particle size of the iron ore having a particle size of 10 mm or less and including the iron ore having a particle size of 3 mm or less in the second compounding material.

The efficiency of utilization of iron ore with fine particle size can be improved by supplying the iron ore with a particle size of 3 mm or less through the screen to the second mixer by mixing the particle size of the iron ore supplied to the first mixer with the second mixing raw material. have.

Next, in the step of manufacturing the molded body, the pellet is compression molded to produce a molded body having a larger particle size or density than the mixed body.

Specifically, the step of manufacturing the molded body may include the step of compressing the pellets using a pair of compression rolls arranged side by side, and the step of crushing the compressed pellets to produce a molded body having a particle size of 4 cm or less.

Through a pair of compression rolls, the pellets can be compressed, and the compressed pellets can be crushed to produce a molded body having a particle size of 4 cm or less. This is because, when the particle size of the molded body exceeds 4 cm, when the particle size of the molded body is too large and loaded into the sintered bogie, the heat transfer is not properly performed due to the size of the molded body, and thus, the sintering may be insufficient.

It can be compression molded at a pressure of 4000 kgf/Br. As shown in FIG. 4, in the case of fine iron ore, there is a difference in compressive strength for each raw material, and a raw material having a compressive strength of 100 kgf/Br or more may be used. It can be seen that when the molding strength by a pair of compression rolls is increased, the compression strength also tends to increase.

When the two raw materials are mixed, it can be seen that they have a compressive strength in the middle range of the compressive strength of each raw material. Therefore, the raw material containing the fine iron ore can be used by mixing not only one kind but also two or more kinds of raw materials because the compressive strength at the time of mixing can be predicted when the compressive strength of each raw material is known.

The step of manufacturing the molded body may further include the step of selecting the particle size of the compression-molded pellets and supplying the compressed pellets having a particle size of 3 mm or less with a pair of compression rolls.

By compressing the compressed pellets having a particle size of 3 mm or less together with the pellets supplied from the pelletizer, it is possible to improve the efficiency of utilization of the second blended raw material containing the fine iron ore.

In addition, the step of manufacturing the molded body may further include the step of selecting the particle size of the molded body and supplying the molded body having a particle size exceeding 4 cm with a pair of compression rolls.

By compressing the molded body with a particle size exceeding 4 cm with the pellet supplied from the pelletizer, the efficiency of utilization of the second blended raw material containing the fine iron ore can be improved, and the particle size of the molded body is too large to be loaded into the sintered truck. When it is, it is possible to prevent the phenomenon that the heat transfer is not properly performed due to the size of the molded body and thus the firing is not sufficiently performed.

Next, in the step of loading the mixed body and the molded body into the sintered bogie, the mixed body and the molded body are dropped into the sintered bogie by using the charging suit formed in the form of a cycloid curve. Accordingly, according to the principle of FIG. 3 and the above equation, as the particle size or density increases, the horizontal dropping distance increases, so that the molded body having a relatively large particle size or density may increase the horizontal dropping distance than the mixed body.

Due to the charging chute formed in the form of a cycloid, the segregation charge of the sintered raw material containing the mixture and the molded body is maximized and charged to the sintered bogie moving in a horizontal direction, so that most of the molded bodies having a relatively large particle size or density are located at the bottom of the inside of the sintered bogie. Most of the mixtures with relatively small particle size or density can be positioned on top of the sintered bogie.

Since the sintered raw material is sintered by sucking air from the top to the bottom, the molded body located at the bottom of the sintered bogie can be sintered by lower heat storage.

Since the particle size of the mixed body is 10 mm or less, and the particle size of the molded body is 4 cm or less, the particle size of the molded body is larger than the particle size of the mixed body, so that the sintered raw material can be loaded in the sintered bogie in the form of vertical segregation.

Specifically, in the step of charging the mixture and the molded body to the sintered truck, with respect to 100% by weight of the sintered raw material containing the mixture and the molded body, the molded body may be 30% by weight or less. When the content of the molded body exceeds 30% by weight, firing may be incomplete due to insufficient fuel.

More than 90% by weight of the molded body may be located at a height of 40% or less from the inner bottom surface of the sintered bore, relative to 100% of the total height of the mixed body and the molded body charged in the sintered bogie.

Accordingly, when the firing proceeds through the forced suction of air from below the sintered bogie, it is possible to expect an effect of improving the productivity of the sintered ore by increasing the combustion rate as air permeability is improved.

As another embodiment of the present invention, a mixture prepared by mixing a molded body with a first compounding material in a first mixer can be charged to a sintered bogie and sintered to produce a sintered ore.

Sintered ore

The sintered ore according to an embodiment of the present invention includes a low-reduction portion and a high-reduction portion, the RI of the low-reduction portion is 65 to 70, and the RI of the high-reduction portion exceeds 70. RI is a Reducibility Index, and may mean a degree of reduction.

5, the sintered ore according to an embodiment of the present invention may be divided into a low-reduction portion and a high-reduction portion. The portion of the low-reduction portion is a portion represented by a sinter, and may be a portion in which the first blended raw material containing iron ore, sub-material and fuel having a particle size of 10 mm or less is sintered at a temperature of 1100°C or higher.

The portion of the high-reduction portion is represented by a briquette, and after the second blended raw material containing fine iron ore, sub-raw materials and fuel having a particle size of 100 µm or less is manufactured in pellet form, it is manufactured into a compression molded molded body and sintered at a temperature of 1100°C or higher. It can be a part.

The RI of the low-reduction portion is 65 to 70, the RI of the high-reduction portion exceeds 70, and specifically, the RI of the high-reduction portion may be 75 to 80. The RI of the high-reduction unit may be greater than the RI of the low-reduction unit.

As shown in FIG. 5, the low-reducing portion and the high-reducing portion coexist so that the advantages of the low-reducing portion and the high-reducing portion can be expected to be mixed.

Specifically, in the case of the high-reducing portion, since the pellet is compression molded and sintered, the density and room temperature strength may be higher than the low-reducing portion.

Charge for manufacturing sintered ore

The charge for manufacturing a sintered ore according to an embodiment of the present invention is a charge for manufacturing a sintered ore located in a sintered bogie, consisting of a mixture of the first mixture raw material containing iron ore and a second mixture raw material containing fine iron ore, It includes a molded body having a larger particle size or density than the mixed body, and 90% by weight or more of the molded body is located at a height of 40% or less from the inner bottom surface of the sintered bore with respect to the total height 100 of the charge for preparing the sintered ore.

Specifically, with respect to 100% by weight of the total charge for producing sintered ore, the molded body may be 30% by weight or less.

Due to the charging chute formed in the form of a cycloid, the segregation charge of the sintered raw material containing the mixture and the molded body is maximized to be charged in the sintered bogie moving in a horizontal direction, so that most of the molded bodies having a relatively large particle size or density are located at the bottom of the inside of the sintered bogie. Most of the mixtures with relatively small particle size or density can be positioned on top of the sintered bogie.

Accordingly, 90% by weight or more of the molded body is located at a height of 40% or less from the inner lower surface of the sintered bore with respect to 100% of the total height of the mixed body and the molded body charged in the sintered bogie.

Accordingly, when the firing proceeds through the forced suction of air from below the sintered bogie, it is possible to expect an effect of improving the productivity of the sintered ore by increasing the combustion rate as air permeability is improved.

The description of the charge for manufacturing a sintered ore according to an embodiment of the present invention will be replaced by the description of the method for manufacturing the sintered ore.

Hereinafter, specific examples of the present invention will be described. However, the following examples are only specific examples of the present invention, and the present invention is not limited to the following examples.

Example

(1) Preparation of sintered ore

[Example 1] A mixture was prepared by mixing a coarse material composed of iron ore, limestone with a particle size of 10 mm or less, and a binder made of coke, fuel and coke composed of anthracite using a first mixer.

A fine iron ore having a particle size of 100 µm or less, a secondary raw material composed of dust produced in a steel mill, and powder and coke, an anthracite fuel and a binder were mixed using a second mixer. Subsequently, pellets having a particle size of 30 mm or less were manufactured through a pelletizer.

The pellets were compression molded through a compacting type twin roll type compressor, and then crushed by a crusher to prepare a molded body having a particle size of 4 cm or less.

The mixture and the molded body prepared as above were loaded into the sintered bogie using a charging chute formed in the form of a cycle rod curve.

At this time, the molded body was added to 10% by weight relative to 100% by weight of the total sintered raw material charged to the sintered bogie.

The sintered ore was prepared by igniting using an ignition furnace at the top of the sintered bogie and then sucking air at the bottom to sinter at a temperature of 1200°C.

[Example 2] A sintered ore was prepared under the same conditions as in Example 1, but the molded body was added in an amount of 20% by weight with respect to 100% by weight of the total sintered raw material charged in the sintered bogie.

[Example 3] A sintered ore was prepared under the same conditions as in Example 1, but the molded body was added in an amount of 30% by weight with respect to 100% by weight of the total sintered raw material charged in the sintered bogie.

[Comparative Example 1] A mixture was prepared by mixing a binder composed of iron ore and limestone having a particle size of 10 mm or less, limestone, fuel and coke composed of anthracite coal using a first mixer.

The sintered ore was prepared by loading the mixture into a sintered bogie, igniting using an ignition furnace at the top of the sintered bogie, and then sucking air at the bottom to sinter at a temperature of 1200°C.

[Comparative Example 2] A sintered ore was manufactured under the same conditions as in Example 2, but instead of being charged to the sintered bogie using a charging suit formed in the form of a cycle rod curve, the sintered bore was loaded using a planar charging chute and then 1200 Sintered ores were prepared by sintering at a temperature of ℃.

(2) Analysis of charging behavior of the molded body

According to Examples 1 to 3, particle analysis was performed on the charging behavior of the mixed body and the molded body charged to the sintered bogie. As shown in FIG. 3, in Examples 1 to 3, the molded body was preferentially charged to the lower portion in the sintered bogie by the charging suit in the form of a cycloid curve.

As a result, it can be confirmed that 90% by weight or more of the molded body was located at a height of 40% or less with respect to the total height of the mixture and the molded body loaded in the sintered bogie.

On the other hand, in the case of Comparative Example 2, which was loaded into the sintered bogie by using the flat type charging chute, the molded body generally showed a shape in which it was charged to the lower portion in the sintered bogie, but more than 90% by weight of the molded body was charged to the sintered bogie. It was not located at a height of 40% or less with respect to the total height of the mixed and molded products.

The reason was as follows.

This is because, in the case of Example 2 using the cycloid curve-shaped charging suit, the emission distance of the molded body increased by 27% compared to Comparative Example 2 using the plane-shaped charging suit.

(3) Evaluation of sintered ore

Reducibility Index, which means the degree of reduction, was measured by the reduction rate method of ISO 7215.

In the case of the sintered ore prepared by the example, as can be seen in Figure 6, it can be seen that the mixture is sintered portion and the molded body is formed in a sintered portion is formed in a mixed form.

In the case where the mixture was sintered, the reduction index was 65 to 70, and the portion where the molded body was sintered was 75 to 80.

As shown in FIG. 7, it can be seen that productivity was improved, the reduction index was increased, and the volume of the generated slag was decreased compared to that of Comparative Example 1.

On the other hand, when evaluating the air permeability of the sintered ore, in the case of Example 2 using the cycloid curved charging suit, it was confirmed that the air permeability of the sintered ore increased by 7.4% compared to Comparative Example 2 using the flat charging charging suit.

The present invention is not limited to the above embodiments and/or embodiments, but may be manufactured in various different forms, and those skilled in the art to which the present invention pertains may change the technical spirit or essential features of the present invention. It will be understood that it may be practiced in other specific forms without. Therefore, it should be understood that the above-described embodiments and/or embodiments are illustrative in all respects and not restrictive.

Claims (24)

1. A mixture manufacturing unit for preparing a mixture by mixing the first mixture raw material containing the iron ore;

   Pellet production unit for producing a pellet by mixing and assembling a second blend raw material containing fine iron ore;

   A molded product manufacturing unit for compression molding the pellet to produce a molded body having a larger particle size or density than the mixed body;

   A charging unit formed in a cycloidal curved shape, and dropping the mixture and the molded body to induce preferential lower charging of the molded body having a larger particle size or density than the mixed body; And

   It is disposed below the charging unit, the sintered ore manufacturing apparatus comprising a; sintered bogie to which the mixture and the molded body are charged.
2. According to claim 1,

   The charging unit,

   With respect to 100% of the total height of the charge for manufacturing the sintered ore loaded into the sintered bogie, 90% by weight or more of the molded body is positioned at a height of 40% or less from the inner bottom surface of the sintered bogie.
3. According to claim 1,

   The mixture manufacturing unit,

   A first raw material feeder including a first storage bin in which the iron ore is stored, and supplying the first combined raw material; And

   And a first mixer for mixing the first blended raw materials supplied from the first raw material feeder to produce a mixed body.
4. According to claim 3,

   The pellet manufacturing unit,

   A second raw material feeder including a second storage bin in which the fine iron ore is stored, and supplying the second combined raw material;

   A second mixer mixing the second blending raw material supplied from the second raw material supplying machine; And

   And a pelletizer for assembling the pellets by assembling the second blending raw material supplied from the second mixer.
5. According to claim 4,

   The mixture manufacturing unit,

   And an iron ore sorter for sorting the particle size of the iron ore supplied from the first storage bin and supplying the iron ore having a predetermined particle size or less to the second mixer.
6. According to claim 1,

   The molded body manufacturing unit,

   A pair of compression rolls arranged side by side to compress the pellets;

   A pellet feeder disposed on the pair of compression rolls to supply the pellets between the pair of compression rolls; And

   And a crushing machine for crushing pellets compressed through the pair of compression rolls to produce the molded body.
7. The method of claim 6,

   The molded body manufacturing unit,

   And a pellet sorter for sorting the particle size of the compressed pellets supplied from the pair of compressed rolls and supplying the compressed pellets having a predetermined particle size or less to the pellet feeder.
8. The method of claim 6,

   The molded body manufacturing unit,

   And a molded body sorting machine for sorting the particle size of the molded body supplied from the crusher and supplying the molded body exceeding a predetermined particle size to the pellet feeder.
9. According to claim 1,

   The charging unit,

   Containing a plurality of loading rolls arranged side by side; includes,

   The central axis of the plurality of charging rolls is a sintered ore manufacturing apparatus arranged along a cycloid curve.
10. According to claim 1,

    The charging unit,

    A sintered ore manufacturing apparatus comprising; an integral charging suit formed as a curved surface along a cycloid curve.
11. Preparing a mixture by mixing the first mixture raw material containing the iron ore;

    Preparing a pellet by mixing and assembling a second blended raw material containing pulverized iron ore;

    Compression molding the pellet to produce a molded body having a larger particle size or density than the mixed body; And

    A method of manufacturing a sintered ore comprising the steps of: loading the mixture and the molded body into a sintered vehicle, and preferentially loading a molded body having a particle size or density higher than that of the mixed body under the sintered vehicle using a charging suit formed along a cycloid curve. .
12. The method of claim 11,

    The step of preparing the mixture,

    Supplying a first blended raw material containing iron ore, sub-raw materials and fuel having a particle size of 10 mm or less; And

    A method of manufacturing a sintered ore comprising; mixing the first mixture raw material through a first mixer to prepare a mixture.
13. The method of claim 12,

    The step of preparing the mixture,

    A method for manufacturing a sintered ore, further comprising: selecting the particle size of the iron ore having a particle size of 10 mm or less and including the iron ore having a particle size of 3 mm or less in the second blended raw material.
14. The method of claim 11,

    The step of preparing the pellets,

    Supplying a second blended raw material containing fine iron ore having a particle size of 100 µm or less, an auxiliary raw material, and a fuel;

    Mixing the second blending material through a second mixer; And

    A method of manufacturing a sintered ore comprising the steps of: manufacturing the mixed second mixture raw material into pellets having a particle size of 30 mm or less.
15. The method of claim 11,

    The step of manufacturing the molded body,

    Compressing the pellets using a pair of compression rolls arranged side by side; And

    Crushing the compressed pellets to produce a molded body having a particle size of 4 cm or less.
16. The method of claim 15,

    The step of manufacturing the molded body,

    And selecting the particle size of the compressed pellets and supplying the compressed pellets having a particle size of 3 mm or less to the pair of compressed rolls.
17. The method of claim 15,

    The step of manufacturing the molded body,

    A method of manufacturing a sintered ore, further comprising: selecting a particle size of the molded body and supplying a molded body having a particle size exceeding 4 cm with the pair of compression rolls.
18. The method of claim 11,

    In the step of loading the mixture and the molded body to the sintered bogie,

    With respect to 100% by weight of the sintered raw material containing the mixture and the molded body, the molded body is 30% by weight or less.
19. The method of claim 11,

    In the step of loading the mixture and the molded body to the sintered bogie,

    A method of manufacturing a sintered ore, wherein at least 90% by weight of the molded body is located at a height of 40% or less from the inner lower surface of the sintered bore, relative to 100% of the total height of the mixed body and the molded body charged in the sintered bogie.
20. The method of claim 11,

    In the step of loading the mixture and the molded body to the sintered bogie,

    The particle size of the mixture is 10 mm or less,

    Method for producing a sintered ore having a particle size of the molded body is 4 cm or less.
21. It includes a low-reduction unit and a high-reduction unit,

    RI of the low-reduction portion is 65 to 70,

    The high reduction part RI has a sintered ore exceeding 70.
22. The method of claim 21,

    The RI of the high reduction part is 75 to 80 sintered ore.
23. As a charge for manufacturing sintered ore located in the sintered bogie,

    A mixture composed of a first blended raw material containing iron ore; And

    Consists of a second blended raw material containing fine iron ore, a molded body having a larger particle size or density than the mixture; includes,

    With respect to 100% of the total height of the charge for manufacturing the sintered ore, in which 90% by weight or more of the molded body is charged to the sintered bogie, the charge for manufacturing the sintered ore is located at a height of 40% or less from the inner bottom surface of the sintered bogie.
24. The method of claim 23,

    With respect to 100% by weight of the total charge for producing the sintered ore, the molded body is 30% by weight or less.

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