KR101449456B1 - Method for manufacturing blending material for sintering process - Google Patents

Abstract

The present invention relates to a method for producing a sintering material, and a method for producing a sintering material for producing sintered ores, comprising the steps of preparing a powdered iron ore, a powdered iron ore and a binder; A process of mixing a minute iron ore, minute iron ore and a binder in a mixer; And a mixture of the iron powder, the iron powder, and the binder is added to the selected granulator to produce a selected granule, wherein the iron powder is selected from the group consisting of 20 to 70 wt% of the total weight of the iron powder and the iron powder, Or less. By using a minute iron ore such as a pellet feed or the like, it is possible to manufacture a granular material having excellent strength, thereby improving manufacturing cost and productivity.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sintering raw material,

The present invention relates to a method for producing a sintering raw material, and more particularly, to a sintering raw material which can produce granules having excellent strength by using a minute iron ore such as a pellet feed or the like, And a manufacturing method thereof.

The manufacturing process of the sintering raw material for producing the sintered ores is generally a process of mixing iron ore as a main raw material, limestone as a subordinate raw material, quicklime and silica, a process of mixing coke serving as a fuel in sintering, a mixture of raw materials, additives and cokes . The granules produced by this process are charged into a sintering machine and sintered. That is, when air is sucked by the suction force of the lower portion of the sintering machine, the coke contained in the granulated material comes into contact with oxygen in the air to generate a flame, and as the flame advances, the sintering blend material charged into the sintering machine is sintered .

On the other hand, there is a tendency to reduce manufacturing cost by using a low-cost iron source instead of iron ore, which is the main raw material in sintering raw materials for sintering. Among these low-cost iron sources, the pellet feed is a ferrous iron ore having a particle size of 0.15 mm or less and contains iron (T.Fe) close to 70%. However, when a pellet feed is used as a sintering raw material in a large amount, when a pellet feed is not selectively granulated, a conventional granulation process is applied to produce granules for a sintering blend raw material. In order to assure granularity and strength, Expensive binders are used in large amounts. Therefore, there is a problem in that the manufacturing cost is increased and the meaning of using a low-cost pellet feed is disappeared. In addition, when a pellet feed is used to produce a granulated product, at least 10 pellets are required to have a desired size and strength, thus requiring a large space and cost for constructing the pellet feed.

KR 2012-74786 A

The present invention provides a method for producing a sintering raw material using a minute iron ore.

The present invention provides a method for producing a sintering raw material capable of securing strength and improving air permeability of a raw material for sintering at the time of sintering.

The present invention provides a method for producing a sintering raw material capable of improving productivity and reducing manufacturing cost.

A method for producing a sintering compound raw material according to an embodiment of the present invention is a method for producing a sintering compound raw material for producing sintered ores, comprising the steps of preparing a minute iron ore, a minute iron ore and a binder; A process of mixing a minute iron ore, minute iron ore and a binder in a mixer; And a mixture of the iron powder, the iron powder, and the binder is added to the selected granulator to produce a selected granule, wherein the iron powder is selected from the group consisting of 20 to 70 wt% of the total weight of the iron powder and the iron powder, By weight or less.

The minuscule iron ores may be a pellet feed having a particle size of more than 0 mm and not more than 0.15 mm.

The particle size of the minute iron ores may be more than 0 mm and less than 4 mm, and the minute iron ores may be at least one of Marra Mamba ore, gray iron and hematite.

The binder may be at least one selected from the group consisting of ultra-fine particles, bentonite, ladle slag, fly ash, and a polymeric organic binder.

The binder may be used in an amount of 0.09 to 7% by weight based on the total weight of the mixture.

The mixing may be performed by stirring the minute iron ore, the minute iron ores and the binder for 3 to 5 minutes.

In the process of manufacturing the selected granule, moisture may be injected into the selected granule.

The moisture may be added in an amount of 1.0 to 1.5% based on the storage capacity of the minute iron ore.

The moisture may be added in an amount of 0.4 to 0.5% more per 10% increase in the amount of the minute iron ores.

The process of preparing the selected granule may be performed by rotating the selective granulator at 45 to 50 ° for 4 to 8 minutes at a speed of 6 to 10 rpm.

And selecting the particle size of the selected granule after the process of manufacturing the selected granule.

In the process of selecting the particle size of the selected granule, the selected granule having a particle size of 2 to 8 mm of the selected granule may be put into the granulator together with the subsidiary material and the fuel to be made into granules for the sintering raw material.

The granules for the sintering and blending raw materials may be assembled in at least two granulators.

In the process of selecting the granules of the selected granule, the selected granule having a granularity of more than 0 to 2 mm out of the selected granules may be re-inserted into the selected granule and reassembled.

According to the embodiments of the present invention, a granulated product can be produced by using a minute iron ore such as minute iron ore and a pellet feed. The granules thus produced can secure excellent strength and productivity even when a small amount of expensive binder is used.

By using a relatively low-cost pellet feed, the manufacturing cost can be reduced.

In addition, since the granulated product can be manufactured by a simple manufacturing process by applying the optimal blending ratio, the cost required for facility investment can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of equipment for explaining a manufacturing process of a raw material for sintering according to an embodiment of the present invention; FIG.
2 is a flow chart for explaining a manufacturing process of a blending raw material for sintering according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely.

In the embodiment of the present invention, as the main raw material used for producing the sintered ores, minute iron ores having a particle size of more than 0 mm and less than 4 mm and a pellet feed having a particle size of more than 0 and 0.15 mm or less are used. Here, the pellet feed can be used as a raw material for producing a sintered ores with a low-priced iron source containing about 68% T.Fe. However, a pellet feed is a minute powder having a particle size of not more than 0.15 mm of not less than 90%, and a large amount of binder is required for manufacturing the granule. Ten granulators are used to granulate the granule so as to have a desired strength. However, since limestone used for granulating the pellet feed is relatively expensive, the manufacturing cost is increased and the meaning of using the low-priced pellet feed as the iron source is reduced, and since the production facility for assembling is complicated and the scale is large, And it is difficult to secure space for production facilities.

Therefore, in the embodiment of the present invention, it is possible to manufacture the selected granular material having the desired strength by setting the optimum blending ratio in manufacturing the selected granule by mixing the relatively low-cost pellet feed and the powdered iron ore, Can be saved.

1 is a block diagram of equipment for explaining a manufacturing process of a blending raw material for sintering according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus for producing a blending raw material for sintering according to an embodiment of the present invention includes a plurality of storage bins 110, 120, 130, 140, 150a, 150b, A mixer 200 for supplying and mixing the raw materials and binders stored in the storage bins 110, 120 and 130 and an optional mixer 300 for assembling the mixed mixture in the mixer 200, A sorting device 400 for sorting the sizes of the selected assemblies manufactured by the selective assembling machine 300 and a sorting device 400 for sorting the fuel and the subordinate material supplied from the storage bins 140, 150a, 150b and 150c, And a plurality of assemblers 510, 520 that mix and assemble the selected assemblies of the size. Here, the storage bins 110, 120, and 130, the mixer 200, and the optional assembler 300 are devices for selectively assembling some of the raw materials for sintering and are referred to as selective assembling apparatuses 100.

The plurality of storage bins 110, 120, 130, 140, 150a, 150b, and 150c includes a minute iron ore storage bin 110 storing minute iron ores as main raw materials, a pellet feed storage bin 120 storing pellet feeds, A binder storage bin 130 for storing a binder used for assembling the iron ores and the pellet feed, a fuel storage bin 140 for storing the fuel coke, coal, and a limestone storage bin 150a for storing limestone, A quicklime storage bin 150b and a silica storage bin 150c. The minute iron ore stored in the minute iron ore storage bin 110 has a particle size of more than 0 mm and not more than 4 mm and is composed of Marra Mamba, Aurogaku (A), hematite or other galena (B, Lt; / RTI > difference). And the pellet feed stored in the pellet feed storage bin 120 is a minute iron ore having a particle size of more than 0 mm and not more than 0.15 mm. In the case of the binder storage bin 130, the number may be determined according to the type of binder used. The binder may be limestone, bentonite, ladle slag, fly ash, polymer organic binder, etc. For example, when limestone and bentonite are used as the binder, the binder storage bin 130 may be provided with a limestone storage bin and a bentonite storage bin . At this time, the limestone storage bin stores limestone having different particle sizes from the limestone storage bin 150a storing the limestone among the subsidiary materials. That is, the limestone used as the binder is composed of a minute fraction having an average particle size of about 15 mu m. Hereinafter, the limestone storage bin storing the limestone in the binder may be referred to as a minute fractionally dispersed limestone storage bin.

The mixer 200 is a 'high-speed stirring mixer' that receives minute iron ore, pellet feed, and binder from the minute iron ore storage bin 110, the pellet feed storage bin 120, and the binder storage bin 130 and rapidly stirs them. The mixer 200 stirs raw materials supplied from the storage bins 110, 120, and 130, such as minute iron ores, pellets feed, and binder, at high speed and mixes them uniformly. The mixer 200 has a cylindrical shape having an internal space and may be provided with stirring means such as a blade (not shown) for mixing the introduced raw materials. At this time, the mixer 200 may be provided with a nozzle for spraying water on the mixture of the minute iron ore, the pellet feed, and the binder.

The selective assembling machine 300 is a pelletizer used in a typical selective assembly facility. The pelletizer 300 has an internal space into which a mixture is charged, a rotary fan (not shown) is installed therein, The mixture of iron ore, pellet feed, and binder is grown on the rotating pan while the particles are gradually grown to produce a selected granule. That is, iron ores having a relatively large grain size act as nuclear particles, and the pellet feed, which is a minute iron ore, is assembled into a form adhered to the surface of minute iron ores.

The selected assembly manufactured in the selective assembling machine 300 is introduced into the sorter 400 and mixed with the fuel and the sub-raw material so that the selected assembly having a size of, for example, 2 mm to 8 mm can be used as the sintering raw material A selected assembly having a size of 2 mm or less can be reused into the selected assembly 300 and used as a nucleus for forming a selected assembly.

The selected granular material having a particle size of about 2 mm to 8 mm selected by the sorter 400 is introduced into another granulator 510 or 520, that is, a blending material granulator for sintering, to produce coke or anthracite, It is mixed with quicklime and silica and is manufactured into granules for sintering.

The granulators 510 and 520 are cylindrically shaped and have an inner space and are rotatable, as a plurality of drums, for example, two drum mixers. The assembling machines 510 and 520 are provided with a water spray nozzle (not shown) for spraying water into the inner space, and spray water onto the selected assembly, fuel and subsidiary material. In the assembling machines 510 and 520, the selected assembly, the fuel, and the subsidiary raw material are mixed with moisture and moved along the inner space by rotation of the assemblies 510 and 520, thereby assembling the assembly, thereby producing the assembly for producing the sintered ores. In the first drum mixer 510, the selected assembly, the fuel and the subsidiary material are mixed and assembled to form a granule for sintering, and the second drum In the mixer 520, the granules for producing sintered ores are moved along the inner space of the drum mixer to increase the strength of the granules.

The granules for producing sintered ores produced in this manner are sintered in the sintering machine 600 to produce sintered ores.

Embodiments of the present invention aim to increase the blending ratio of the pellet feed and to improve the strength of the selected selected granule in the production of the selected granule by using the pellet feed. In the embodiment of the present invention, the blending ratio of the minute iron ore and the pellet feed is increased to about 70% of the total weight of the mixture of minute iron ore, pellet feed and binder, and the strength of the thus- The strength of the assembled product is about 70%.

Therefore, it is important to select the maximum amount of pellet feed that can be used for selective assembly. The best is to produce a selective granulation with only 100% of the pellet feed in the preparation of the selected granule, but in this case it is difficult to secure the strength of the selected granule even though the binder of the present invention is used.

The strength of the selected assembly is aimed at securing the strength of this degree based on 70% when 100% iron ore is used as the raw material for selective assembly. At this time, the strength indicates the proportion of the selected granules having a particle size of 4 to 6 mm of the selected granule and having a granular particle size of 4 mm or more when the granules are dropped five times at a height of 2 m.

The blend ratio of the pellet feed which can be used in the production of the selected granule is about 70%. Table 1 below shows the strength characteristics of the granule according to the variation of the blend ratio of the pellets feed in the manufacture of the selected granule (assuming that the binder is used and the mixing ratio of the binder is not included).

Pellet feed ratio 100% 90% 80% 70% 60% burglar 43 52 61 70 74

Table 1 shows that when the pellet feed is used at 70% or less, it is possible to secure the desired strength of the selected granular material up to 70, but when the blend ratio of the pellet feed is used in excess of 70%, the strength of the selected granular material Can not reach the target strength. Accordingly, in the embodiment of the present invention, the blending ratio of the pellet feed, which can reduce the manufacturing cost while securing the strength of the selected granule, is 20 to 70%, preferably 65 to 70 %. That is, when the blending ratio of the pellet feed is less than the range shown in the table, the effect of reducing the manufacturing cost is insignificant, and when the blending ratio is more than the recommended range, it is difficult to produce the selected granule having the desired strength.

On the other hand, depending on the kind of iron ore used in the manufacture of the selected granule, the strength of the selected granule may be different.

Table 3 below shows the conditions for using the iron ore 30% and the pellet feed 70% in the formulation for the selected granule (assuming that the binder is used and the mixing ratio of the binder is not included) Indicates the strength of the assembly.

Marra Mamba Ore Apt Calmette B hematite burglar 70 65 67 62

Table 2 shows that the use of Marra Mamba ore is advantageous in securing the strength of the selected granule.

In addition, when a selective granulation is produced by using a mixture of minute iron ore, a pellet feed, and a binder, the moisture content supplied to the mixture can be a very important factor for determining the grain size and strength of the selected granule. The water content supplied to the mixture may vary depending on the capacity of the ore used (water-retaining property, as a percentage of the volume of the ore).

Table 3 below shows the maintenance performance depending on the type of iron ore and the content of water required for selective assembly.

Ore type Function Moisture content for selective assembly Marra Mamba Ore 8.2% 9.2 to 9.7% Apt 9.25% 10.25 to 10.75% Calmette B 7.12% 8.12 to 8.62% hematite 6.22% 7.22 to 7.72%

Referring to Table 3, the water content used in the manufacture of the selected granule may be about 7 to 11% of the minute iron ore volume. Such a moisture content greatly affects the selective assembly of the mixture. Particularly, when the moisture content is higher than the recommended range, the mixture adheres to the selective assembly 300, making normal assembly difficult. On the other hand, if the moisture content is less than the range specified, the assembly of the mixture itself is difficult, and even if the mixture is assembled, the degree of assembly becomes poor.

In addition, the water content can be adjusted according to the blending ratio of the pellet feed, and it is preferable to increase the water content by 0.4 to 0.5% each time the blending ratio of the pellet feed is increased by about 10%.

On the other hand, it is difficult to assemble a mixture of powdered iron ore and a pellet feed even in the presence of water, and to secure the strength of the selected selected granulated product when the selective granulated product is produced using minute iron ore and pellet feed. Therefore, a certain amount of binder is required to produce a selective granulation with the desired strength of mined iron ore and pellet feed. The binder may be selected from the group consisting of super-fine limestone, bentonite, ladle slag, and fly ash. The binder may be used in an amount of about 0.1 to 7% by weight based on the total weight of the iron ores, pellets feed, and binders.

Table 4 below shows the mixing ratio according to the kind of binders and the strength of the selected selected granules.

Binders
Mixing ratio Mineral Mineral Limestone + Bentonite Ladle slag + fly ash Polymeric organic binder 3% 5% 7% 3% 5% 7% 0.05% 0.10% 0.15% Assembleability usually Good Good usually Good usually Bad Good Bad Assembly strength 65 70 73 65 68 66 64 71 75

Min iron ore Pellet feed Superfine limestone Bentonite Mixing ratio 28.04% to 28.38% 65.42 - 66.23% 4.73-5.61% 0.66 to 0.93%

Min iron ore Pellet feed Ladle slag Fly ash Mixing ratio 28.57% ~ 29.13% 66.67 to 67.96% 0.97 to 1.59% 1.94 to 3.17%

Min iron ore Pellet feed Polymeric organic binder Mixing ratio 29.66% to 29.97% 69.92 to 69.94% 0.09 to 0.11%

In Table 4 and FIG. 5, when using the micro-scale limestone and bentonite as the binder, the selected granule produced when using about 5 to 7% of the total weight of the mixture of minute iron ore, pellet feed, It can be seen that it has strength. The ultrafine limestone used herein preferably has an average particle size of 15 탆 or more, preferably 35 탆 or so, thereby improving the efficiency of producing selected granules. In the case of bentonite, it is preferable to use at least about 0.7 to 1.0% by weight with respect to the total weight of the mixture of iron ore, pellets feed and binder. If it is used more than the recommended range, Which is undesirable in view of the above.

As shown in Tables 4 and 7, when a polymeric organic binder is used as a binder, the amount of the polymeric binder used is smaller than that of a mixture of a very fine dispersant and a bentonite or a mixture of a ladle slag and a fly ash. That is, it can be seen that the selected granule has a desired strength when used at 0.1% or more. However, there is a problem that the assemblability is deteriorated as compared with the case of using a mixture of a minute fractional limestone and a bentonite, and a mixture of a ladle slag and a fly ash. At this time, as the amount of the polymeric organic binder is increased, the strength of the selected granule increases, but the granule for producing the sintered ores is not preferable from the viewpoint of the overall composition of the granules for producing sintered ores, It is good. Further, when the amount of the polymer organic binder is less than the suggested range, the assembling property is poor.

Further, as shown in Tables 4 and 6, when a mixture of ladle slag and fly ash is used as a binder, the strength of the assembled and manufactured selected assembly is less than that of the mixture of the ultrafine limestone and bentonite, It can be understood that the strength of the selected assembly is poor. Nevertheless, when a mixture of ladle slag and fly ash is used as a binder, the blending ratio of ladle slag and fly ash is about 1: 2, which is effective on the assembly side. However, when the blending ratio of these mixtures is increased beyond the range shown in Table 6, it is not preferable in terms of the total composition of the sintered ores.

Hereinafter, a method for producing a sintering raw material according to an embodiment of the present invention will be described.

FIG. 2 is a flow chart for explaining a manufacturing process of a blending raw material for sintering according to an embodiment of the present invention. Here, a process of assembling raw materials of a sintering blend raw material will be described.

First, the raw materials and binders necessary for manufacturing the selected assembly are prepared (S110).

Here, the main raw material is a minute iron ore having a particle size of more than 0 mm and 4 mm or less and a pellet feed having a particle size of more than 0 and 0.15 mm or less are used. As the binder, a minute fraction of limestone, bentonite, ladle slag, fly ash ash and a polymeric organic binder may be used. Min Iron ore can be Marra Mamba ore, black flour (A), hematite or other black flour (B).

The raw materials thus prepared are supplied to the mixer 200 so as to have a predetermined mixing ratio, and are rapidly stirred to mix the iron ore, the pellet feed and the binder uniformly (S120). The minute iron ore, the pellet feed and the binder which are put into the mixer 200 are preferably mixed for about 3 to 5 minutes. If the mixing time is less than the recommended range, it is difficult to uniformly mix the raw materials in the mixer 200, and if the mixing time is more than the range, the process time is increased only in terms of the effect of the mixing time.

When the minute iron ore, the pellet feed, and the binder are mixed in the mixer 200, the mixture mixed in the mixer 200 is put into the optional pelletizer 300 and assembled into a predetermined size, for example, about 2 to 8 mm, Water is produced (S130). At this time, water is injected into the selective assembling machine 300, and the inside of the selective assembling machine 300 is rotated to mix and mix the internal mixture. The selective assembling machine 300 is inclined by about 45 to 50 degrees so that the mixture is raised and lowered in the inner space of the selective assembling machine 300 by the rotation of the selective assembling machine 300, . It is preferable that the selective assembling process is performed for 4 to 8 minutes while rotating the selective assembling machine 300 at a speed of about 6 to 10 rpm. When the rotational speed and the assembly time are less than the suggested range, the assemblability of the mixture is poor, and when the rotational speed and the assembly time are larger than the suggested range, the improvement in the overall assemblability is not significant.

Thereafter, when the selected granule is manufactured, the selected granule is selected (S140) in the sorter 400 provided at the rear end of the selected granule 300, and the selected granules of a certain size, for example, about 2 to 8 mm, (S150) the granulated raw material granules for sintering together with the fuel and the subsidiary raw material are put into the granulator (510, 520) for producing the raw granular material. And the selected assembly having a particle size of 2 mm or less in the selected assembly is again supplied to the selection assembly 300 to be used for manufacturing the selected assembly. Thus, the selected assembly re-inserted into the selective assembling machine 300 can act as nuclei during assembling to improve the assembling efficiency.

As described above, according to the embodiment of the present invention, a pellet feed, which is a relatively inexpensive minerals iron ore, can be selectively assembled with fine iron ores to be used as a raw material for sintering. In order to selectively assemble the pellet feed, it is possible to reduce the mixing cost of the binder and reduce the manufacturing cost, even though a large amount of pellet feed is used. In addition, since the selective assembly can be manufactured by a simple selective assembling process, it is possible to reduce the space and cost of the equipment construction.

In addition, the strength of the selected granule can be secured similarly to the case where the pellet feed is not used, and the productivity of the sintered ores can be improved by securing the air permeability in the sintering machine during the sintering operation.

Although the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims and equivalents thereof.

100: Optional assembly device
110, 120, 130, 140, 150a, 150b, 150c:
200: Mixer
300: Optional assembly machine
400: selector
510, 520: Pelletizer for raw materials for sinter
600: Sintering machine

Claims (15)

A method for producing a sintering raw material for producing sintered ores,
Minute iron ore, a minute iron ore and a binder;
A process of mixing a minute iron ore, minute iron ore and a binder in a mixer;
Adding a mixture of the minute iron ores, minute iron ores and a binder to a selective granulator to produce a selected granular product;
≪ / RTI >
Wherein the minute iron ore is blended in an amount of 20 to 70% by weight or less based on the total weight of the minute iron ore and the minute iron ore,
Wherein the step of preparing the selected granules is performed by rotating the selective granulator at 45 to 50 ° for 4 to 8 minutes at a speed of 6 to 10 rpm. The method according to claim 1,
Wherein the micro-minute iron ore is a pellet feed having a particle size of more than 0 mm and not more than 0.15 mm. The method according to claim 1,
Wherein the particle size of the minute iron ores is more than 0 mm and not more than 4 mm. The method according to claim 1,
Wherein the minute iron ore is at least one of Marra Mamba ore, gray iron and hematite. The method according to claim 1,
Wherein the binder is at least one selected from the group consisting of super-fine limestone, bentonite, ladle slag, fly ash, and a polymeric organic binder. The method according to claim 1,
Wherein the binder is used in an amount of 0.09 to 7 wt% based on the total weight of the mixture. The method according to claim 1,
Wherein the mixing is performed by stirring the powdered iron ore, the minute iron ores and the binder for 3 to 5 minutes. The method according to claim 1,
In the process of manufacturing the selected assembly
And spraying water into the interior of the selective granulator. The method of claim 8,
Wherein the moisture is added in an amount of 1.0 to 1.5% more based on the storage capacity of the minute iron ores. The method of claim 9,
Wherein the moisture is added in an amount of 0.4 to 0.5% more each time the blending amount of the minute iron ores is increased by 10%. delete The method according to claim 1,
And selecting the particle size of the selected granule after the process of manufacturing the selected granule. The method of claim 12,
Wherein the selective agglomerate having a particle size of 2 to 8 mm of the selected agglomerates is charged into a granulator together with an additive and a fuel to produce a granulated product for a sintering blend raw material. 14. The method of claim 13,
Wherein the granules for the sintering and blending raw materials are assembled in at least two or more granulating machines. The method of claim 12,
Wherein the selected granules having a particle size of more than 0 to 2 mm of the selected granules are re-introduced into the selective granulator and reassembled in the course of selecting granules of the selected granules.

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