WO2017069526A1 - Apparatus for processing raw material, method of processing raw material, and granules manufactured using same - Google Patents

Abstract

The present invention relates to an apparatus for processing a raw material, a method for processing a raw material, and granules manufactured using the same, and the method for processing a raw material for manufacturing sintered ore comprises the steps of: preparing a ferruginous ultrafine raw material and a binder; mixing the ferruginous ultrafine raw material and the binder in a mixer; manufacturing primary granules by inserting the ferruginous ultrafine raw material and the binder into a first granulator; manufacturing secondary granules by inserting the first granules and quicklime (CaO) and/or slaked lime (Ca(OH)₂) into a second granulator; and curing the secondary granules with CO₂, thereby manufacturing the granules of excellent strength by using an ultrafine material such as ultrafine iron ore.

Description

Raw material processing apparatus, raw material processing method and granules manufactured using the same

The present invention relates to a raw material processing apparatus, a raw material processing method, and a granulated product manufactured using the same, and more particularly, a raw material processing apparatus capable of producing granulated materials having excellent strength by using an ultra fine raw material such as ultra fine iron ore. It relates to a raw material processing method and granules produced using the same.

In the sintered ore manufacturing process, sintered fine iron ore is manufactured to a size suitable for blast furnace use. In this sintering process, iron ore, secondary raw materials, and fuels (powder coke, anthracite coal), etc. are put in a drum mixer, mixed and humidified (raw material weight ratio of about 7 to 8%), and the sintered blended raw materials are pseudo-granulated to be fixed on the sintered truck. Charging at a height and firing of the sintered blended raw material proceeds by forcibly sucking air from below after surface ignition by the ignition furnace, and a sintered ore is manufactured. After sintering is completed, the sintered ore is cooled in a cooler through a crusher of the light distribution unit, classified into a particle size of 5 to 50 mm that is easy for charging and reaction in the blast furnace, and then transferred to the blast furnace. Generally, the process of preparing a sintered blended raw material for producing a sintered ore is a process of mixing iron ore as a main raw material, limestone as a raw material, quicklime and silica, and coke acting as a fuel during sintering, assembling a mixture of main raw materials, subsidiary materials and coke. It includes the process of doing. And the granulated material produced by this process is charged into the sintering machine and sintered. That is, when the air is sucked through the lower part of the sinterer, the coke contained in the granulated material is brought into contact with oxygen in the air to generate a flame, and as the flame is advanced, the sintered compound raw material charged into the sinterer is sintered. .

Meanwhile, a method of reducing manufacturing cost by using an inexpensive iron source instead of iron ore, which is a main raw material, for sintering blended raw materials has been devised. Among such low-cost iron sources, pellet feed is an ultra fine iron ore having a particle size of 0.15 mm or less and contains nearly 70% of iron (T.Fe) component. However, when pellet feed is used as a raw material for sintering compounding, when the granules for the raw material for sintering compounding are manufactured by applying a conventional granulation process without selectively granulating the pellet feed, such as quicklime to secure granularity and strength. Expensive binders are used in large quantities. This increases the manufacturing cost, there is a problem that the use of relatively inexpensive pellet feed is meaningless. In addition, in the case of manufacturing the granulated material using the pellet feed, at least 10 or more granulators are required to have a desired size and strength, and there is a problem in that space and cost for building a facility are enormous.

The present invention provides a raw material processing apparatus, a raw material processing method, and a granulated product manufactured using the same, which can improve the strength of a granulated product made of an ultrafine raw material.

The present invention provides a raw material processing apparatus, a raw material processing method, and a granulated product manufactured using the same, which can improve the strength of the granulated product and improve the operation efficiency using the granulated product.

A raw material processing apparatus according to an embodiment of the present invention, an apparatus for processing a raw material for producing a sintered ore, comprising: a primary granulator for assembling an iron-containing fine powder raw material and a binder to produce a primary granulated product; A secondary granulator for forming a secondary granule by forming a coating layer including at least one of quicklime and slaked lime on the surface of the primary granule; It may include a curing device for curing the secondary granules.

It may include a mixer for mixing the iron-containing fine powder raw material and the binder.

The primary granulator and the secondary granulator may include a moisture supplier for supplying moisture.

The curing machine may include a transfer path for transferring the secondary granules manufactured in the secondary granulator, and an exhaust gas supply for supplying exhaust gas to the transfer path.

The exhaust gas supply may supply the exhaust gas generated in the lime firing process.

A raw material processing method according to an embodiment of the present invention, a method for processing a raw material for the production of sintered ore, the process of preparing an iron-containing ultra-fine powder raw material and the binder; Mixing the iron-containing ultrafine powder and a binder in a mixer; Preparing a primary granule by injecting the iron-containing fine powder raw material and a binder into a primary granulator; Preparing at least one of the primary granules, quicklime (CaO) and slaked lime (Ca (OH) ₂ ) to a secondary granulator to produce a secondary granule; And curing the secondary granules with CO ₂ .

The iron-containing fine powder raw material may have a particle size of more than 0 mm to 4 mm or less.

The iron-containing fine powder raw material may include at least one of iron ore, pellet feed and steelmaking by-products.

The binder may include at least one of molasses, ultrafine limestone, bentonite, ladle slag, fly ash, and a polymer organic binder.

The binder may be used in an amount of 0.1 to 5% by weight based on the weight of the iron-containing ultrafine powder.

Water may be supplied in the process of manufacturing the primary granules and the secondary granules.

In the process of manufacturing the secondary granules, the secondary granules may be manufactured to a size of 10 mm or less.

In the curing process, it is possible to supply the exhaust gas containing CO ₂ to the secondary assembly.

The exhaust gas may be an exhaust gas generated in a lime firing process.

The exhaust gas may have a CO ₂ concentration of 3 to 7%.

The exhaust gas may contain 3 to 10% moisture.

In the curing process, the exhaust gas of 50 to 100 ℃ can be supplied to the secondary granules.

The curing may be performed in a process of transferring to the reservoir for storing the secondary assembly.

In the curing process, a coating layer including calcium carbonate may be formed on the surface of the primary granule.

The granulated material according to the embodiment of the present invention may be manufactured by the above-described raw material processing method, and may be formed to have a diameter of 10 mm or less.

The granulated material may have a coating layer having a thickness of 0.25 to 1 mm, and the coating layer may include calcium carbonate (CaCO ₃ ).

According to embodiments of the present invention, it is possible to improve the strength of the granules produced by using the finely divided raw materials such as iron ore and pellet feed. After the primary granules are prepared using the ultrafine raw materials, the granules may be manufactured using the ultrafine iron ore such that the coating layer containing quicklime or slaked lime on the surface of the primary granules. Thus manufactured granules can be secured excellent strength and productivity even if a small amount of expensive binders.

1 is a view showing a sintered ore manufacturing equipment.

2 is a view conceptually showing a raw material processing apparatus according to an embodiment of the present invention.

3 is a flowchart illustrating a raw material processing method according to an embodiment of the present invention.

4 is a view conceptually showing a granule manufactured by the raw material processing method 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. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art the scope of the invention. It is provided for complete information.

In an embodiment of the present invention, the ultrafine powder having a particle size of more than 0 mm to 4 mm may be used as a raw material to prepare a sintered ore by making granules. To this end, by forming a granulated material using an ultra fine raw material, for example, iron-containing fine powder raw material, and curing it using CO ₂ , a strength of the granulated product may be increased by forming a coating layer on the surface of the granulated product.

1 is a view showing a sintered ore manufacturing equipment, FIG. 2 is a view conceptually showing a raw material processing apparatus according to an embodiment of the present invention, Figure 3 is a flow chart for explaining a raw material processing method according to an embodiment of the present invention. 4 is a view conceptually showing a granule manufactured by the raw material processing method according to an embodiment of the present invention.

First, referring to FIG. 1, a sintered ore manufacturing facility includes a moving path (not shown) for forming a closed loop, a sintered bogie 300 moving in an endless orbit manner along the moving path, and disposed on the moving path. The raw material supply unit 100 for charging the sintering raw material into the sintering bogie 300, and the ignition furnace 200 and the sintering bogie 300 to ignite by spraying the flame on the surface layer of the raw material in the sintering bogie 300 It includes a plurality of wind box 400.

When the upper light and the sintered blended raw material are charged by the raw material supply unit 100 in the sintered trolley 300 moving along the movement path, one side of the raw material supply unit 100, that is, the front direction of the moving direction of the sintered trolley 300. The surface layer portion of the sintered compound raw material in the sintered trolley 300 is ignited in the ignition furnace 200 located. After the ignition, the sintered trolley 300 moves along the movement path, and the sintered blend 300 is sintered by the inside of the sintered trolley 300 by the wind box 400 under the moving path, and the sintered ore is manufactured.

On the other hand, the raw material of the sintered ore may be used for the top light and the sintered blended raw material. The upper light is generated after the production of the sintered ore and means a sintered ore having a predetermined size, for example, about 10 to 15 mm, selected by the sorter 560. The upper light is stored in the upper optical hopper 110 of one side of the surge hopper 120 for storing the sintered compound raw material, and is charged to the bottom of the sintered bogie 300 before charging the sintered compound raw material to the sintered bogie 300. And the raw material for sintering blend includes iron ore, quicklime, limestone, silica, coke, coal and the like, it means that they are mixed uniformly. At this time, coke and coal may be used as fuel. The sintered compound raw material is charged to the upper part of the upper light in the sintered trolley 300 by the charging device 130, each raw material constituting them has a particle size of, for example, 10mm or less. However, as described in the background art, an extremely fine raw material having a very small particle diameter, for example, greater than 0 to 4 mm or less, deteriorates the air permeability in the sintered bogie 300 during sintering, so that the sintered blend raw material is subjected to a separate processing process, that is, an assembly process. Can be used as However, in the general assembly process, the strength of the granules is not very good because the fine powder is assembled into a granulator and used as it is. Therefore, in the present invention, the strength of the granulated product can be improved by forming a coating layer on the surface of the granulated product after the curing process after preparing the granulated product using the ultrafine powder.

Hereinafter, a raw material processing apparatus for preparing a sintered blend raw material may be configured as follows.

2, the raw material processing apparatus 500 mixes raw materials supplied from the raw material reservoirs 520, 522, 524, 526, and 528 and the raw material reservoirs 520, 522, 524, 526, and 528. It includes a primary mixer 530, a granulation unit 540 for assembling ultrafine raw materials to produce granules, and a secondary mixer 550 for mixing the raw materials and granules mixed in the primary mixer 530. can do.

The raw material reservoirs 520, 522, 524, 526, and 528 include an iron ore storage hopper for storing iron ore, a limestone hopper for storing limestone, a 522, a silica ore hopper for storing quartz, and coke Or a fuel hopper 526 for storing fuel such as coal and a semi-light hopper 528 for storing semi-glossy. At this time, the semi-light hopper 528 receives the semi-light from the storage hoppers 510 and 512 for storing the semi-reflected light generated after the manufacture of the blast furnace semi-light or sintered ore.

The primary mixer 530 serves to uniformly mix each raw material discharged from each hopper of the raw material reservoirs 520, 522, 524, 526, and 528.

The secondary mixer 550 uniformly mixes the mixture discharged from the primary mixer 530 and the granules produced in the granulation unit 540 to produce a sintered blended raw material. The prepared sintered blended raw material is stored in the surge hopper 120 of the raw material supply unit 100 of the sintered ore manufacturing equipment.

The granulation unit 540 includes a first hopper 541 for storing the ultra fine raw material and the binder, a mixer 542 for uniformly mixing the ultra fine raw material and the binder discharged from the first hopper 541, and the ultra fine raw material. And a primary granulator 543 for assembling a mixture of a binder and a primary granule, a second hopper 544 for storing quicklime and slaked lime, and a primary granule manufactured in the primary granulator 543. It may include a secondary granulator 545 for producing the secondary granules using at least one of quicklime and slaked lime and a curing machine 546 for curing the secondary granules.

The first hopper 541 may be configured in plural to store the ultra fine raw material and the binder, respectively, and may discharge the ultra fine raw material and the binder by a predetermined amount to the mixer 542. In this case, the ultrafine raw material may be an iron-containing ultrafine raw material containing iron, and may have a particle size of more than 0 to 4 mm or less. Iron-containing ultrafine raw materials may include iron ore, pellet feed, steelmaking by-products, etc., and steelmaking by-products may include dust or sludge.

The binder may include at least one of molasses, microanalytical lime, bentonite, ladle slag, fly ash, and a polymer organic binder, and may be used in a solid state or a liquid state.

The mixer 542 may be a 'high speed agitation mixer' for rapidly stirring the iron-containing ultrafine powder and the binder supplied from the first hopper 541. The mixer 542 stirs the ferrous fine powder raw material supplied from the first hopper 541 and the binder at high speed to uniformly mix the same. The mixer 542 has a cylindrical shape having an internal space, and may be provided with a stirring means, for example, a blade (not shown) for mixing the inputted raw materials. At this time, the mixer 542 may be provided with a nozzle for spraying water on the mixture of the ultra-ferrous iron raw material and the binder.

The primary granulator 543 is a pelletizer used in a typical selective assembly facility, and has an internal space in which a mixture is charged, and a rotating fan (not shown) is installed therein, and is mixed in the mixer 542. The mixture of the ultrafine iron-containing raw material and the binder flows on a rotating fan to gradually grow particles to granulate to prepare a primary granule. At this time, the primary granulator 543 may be provided with a moisture supply for supplying moisture in the primary granulator 543 so that the iron-containing ultrafine raw material and the binder can be easily combined.

The secondary granulator 545 may be formed to have almost the same configuration as the primary granulator 543.

The secondary granulator 545 manufactures the secondary granules using at least one of the primary granules manufactured in the primary granulator 543 and the quicklime and slaked lime supplied from the second hopper 544. The secondary granules may be formed by using a primary granule having a relatively large particle as a nucleus, and having quick particle or slaked lime having a smaller particle size attached to the surface of the primary granule.

At this time, the secondary granulator 545 may be provided with a moisture supply for supplying moisture in the secondary granulator 545 so that quick lime or slaked lime can be easily attached to the surface of the primary granule.

The curing machine 546 may include a transport path for transporting the secondary granules manufactured by the secondary granulator 545, and a gas containing at least one of carbon and oxygen in the secondary assembly transported along the transport path. And an exhaust gas supply for supplying exhaust gas containing CO ₂ . In this case, the transport path may be a conveyor belt or the like, and the exhaust gas supplier may be formed to inject the exhaust gas onto the transport path.

The exhaust gas supplier may supply various exhaust gases generated in the steelmaking process, and in the embodiment of the present invention, may supply exhaust gases generated in the lime firing process.

Hereinafter, the method of processing a raw material using the above-mentioned raw material processing apparatus is demonstrated.

Referring to Figure 3, the raw material processing method according to an embodiment of the present invention, the process of preparing a main raw material (S100), the primary mixing process of mixing the main raw material (S110), to prepare a granulated material by assembling the ultra fine raw materials Process (S120), the secondary raw material mixing the raw material and the granulated material to produce a sintered blending raw material (S130) and the step of storing the sintered blended raw material in a reservoir, that is, surge hopper 120 (S140) have.

In addition to the process of manufacturing a granulated material here, the remaining processes are almost similar to the process of manufacturing a general sintered compound raw material.

However, in the manufacture of granules, at least one of quicklime and slaked lime is used in addition to the ultrafine iron-containing raw materials. Therefore, when preparing main raw materials, quicklime or slaked lime is not provided separately or less than the amount prepared when preparing the raw material for sintering compounding. can do.

The process of manufacturing the granulated product is as follows.

The process of manufacturing the granulated material (S120), the process of preparing the iron-containing fine powder, binder and quicklime and hydrated lime (S121), the process of mixing the iron-containing fine powder and the binder (S122), and the iron-containing fine powder Preparation of primary granules using a mixture of binders (S123), and quicklime on the surface of the primary granules using any one of the primary granules, quicklime (CaO) and slaked lime (Ca (OH) ₂ ) And a step (S124) of preparing a secondary granule in which a coating layer containing any one of slaked lime is formed, and a step (S125) of curing the secondary granule with CO ₂ .

Iron-containing ultrafine raw materials may include iron ore, pellet feed, steelmaking by-products having a particle size greater than 0 to 4 mm or less. In this case, the steelmaking by-product may be dust or sludge containing an iron component.

When iron ore and steelmaking by-products are used as the iron-containing fine powder, iron ore may be included in an amount of about 50 to 90% by weight based on the total weight of the iron-containing fine powder. When the content of iron ore is less than the suggested range, the iron content in the sintered ore decreases, and when more than the suggested range, the strength of the granules is lowered.

The binder may be at least one of molasses, microanalytical lime, bentonite, ladle slag, fly ash, and a polymer organic binder. In this case, the binder may be used in the liquid state or the solid state. The binder may be used in an amount of 0.1 to 5% by weight based on the weight of the iron-containing fine powder raw material. At this time, when the binder is in the liquid state, it is preferable to use it in the range of about 0.1 to 1% by weight, and in the solid state, it is preferable to use it in the range of 5% by weight or less. When the binder is in a liquid state, if the binder is used in a smaller or larger range than the suggested range, the assemblability of the assembly may be degraded in the subsequent assembly process. In addition, when the binder is in a solid state, when the binder is used in less than the indicated range, the granularity of the granules may be reduced, and when the binder is used in a larger range, the assembly of the granule may be improved, but it may be performed later. As the binder is removed in the high temperature process, the strength of the granules may be lowered, and when the sintered ore manufactured using the same is used in the steelmaking process, a large amount of steel slag may occur.

Quicklime and slaked lime are materials for forming a coating layer on the surface of a granule when the granule is manufactured. Quicklime and slaked lime may have a particle size of greater than 0 to about 0.25 mm. If the particle size of quicklime and hydrated lime is larger than the suggested range, it is difficult to form a coating layer having a uniform thickness, and there is a problem that it is difficult to effectively increase the strength of the granules by delaying the reaction time with CO ₂ during the curing process.

In this way, when the raw material for producing the granulated material is provided, the iron-containing fine powder raw material and the binder are supplied to the mixer 542 to be uniformly mixed.

Subsequently, the mixture of the iron-containing fine powder raw material and the binder is charged into a primary granulator 543 to prepare a primary granule composed of the iron-containing fine powder raw material and the binder.

When the primary granules are manufactured, the primary granules are charged into the secondary granulator 545, and at least one of quicklime and slaked lime is charged to prepare the secondary granules. The secondary granules form a coating layer containing either quicklime or hydrated lime on the surface of the primary granules, and supply the moisture to the secondary granulator 545 so that quicklime or hydrated lime can be easily attached to the surface of the primary granules. Can be.

The secondary granules may be formed to have a particle size of 10 mm or less, and preferably, a ratio having a particle size of about 1 to 8 mm may be about 70 to 90%. When the ratio of the particle size of about 1 to 8 mm is smaller than the suggested range, the fine powder content of the sintered blend raw material may be excessively increased, and thus the air permeability in the sintered bogie 300 may be deteriorated. In addition, the ratio having a particle size of about 1 to 8 mm may be larger than the indicated range, but it is impossible due to the capability of the installation itself.

In addition, the coating layer formed on the surface of the primary assembly by the secondary assembly process may be formed to a thickness of about 0.25 to 1 mm. If the thickness of the coating layer is smaller than the suggested range, the coating layer is not partially formed on the surface of the primary assembly, so that the strength of the final fabricated assembly cannot be improved as desired, and if the coating layer is larger than the suggested range, the strength of the assembly can be improved. However, the effect is insignificant and there is a problem that the production cost increases with the use of quicklime or slaked lime.

When the secondary granules are manufactured as described above, the secondary granules are transferred to the secondary mixer 550 so as to uniformly mix the secondary granules.

In the process of transferring the secondary granules to the secondary mixer 550, the secondary granules are cured by supplying flue gas containing CO 2 to a transfer path through which the secondary granules are transferred. In this case, the flue gas supplied to the secondary granulated product may be flue gas generated in various processes, and in the present embodiment, flue gas generated in a lime firing process for preparing quicklime may be used.

Flue gas generated in the lime firing process is a high temperature of about 300 ℃, if the direct supply of such exhaust gas to the secondary assembly has a problem that the transport path to the secondary assembly is transported may be damaged. In addition, although the secondary granules contain a predetermined amount of water, when a high temperature exhaust gas is supplied, there is a problem in that the secondary granules may be differentiated as the moisture in the secondary granules rapidly evaporates.

Therefore, in the present invention, by mixing air to the exhaust gas of about 300 ℃ generated in the lime firing process, cooled to about 100 ℃ or less, for example, 50 to 100 ℃ and supplied to the secondary granules to suppress or prevent the differentiation of the secondary granules have.

The flue gas generated in the lime calcination process contains about 20% of CO ₂ concentration and about 15% of moisture. When air is mixed with the flue gas, the concentration of CO _{2 in} the flue gas and the moisture content may be reduced to some extent. In the curing process, a secondary gas can be supplied with a flue gas having a CO 2 concentration of 10% or less, preferably 3-7%, and a water content of 10% or less, preferably 3-10%.

In this curing process, the coating layer formed on the surface of the secondary granules, that is, the surface of the primary granules is cured by forming CO ₂ and calcium carbonate (CaCO ₃ ) by the reaction of Equation 1 and 2 below. This may improve the strength of the secondary assembly.

Formula 1) CaO + CO _2- > CaCO ₃

2) Ca (OH) ₂ + CO _2- > CaCO ₃ + H ₂ O

The granulated material thus prepared is supplied to the secondary mixer 550, mixed with the main raw materials mixed in the primary mixer 530, prepared as a sintered compound raw material, and then charged into the surge hopper 120.

Hereinafter will be described an experimental example for verifying the strength improvement of the granules produced by the raw material processing method according to the present invention.

First, the primary granules were prepared using iron ore, dust and sludge each having a composition ratio of 2: 1: 1, and molasses as a binder.

Next, the secondary granules were prepared by forming a coating layer on the surface of the primary granules using quicklime having a particle size of 0.25 mm or less. At this time, the secondary granules were prepared by varying the thickness of the coating layer.

Thereafter, air was mixed into the exhaust gas generated in the lime calcination process, cooled to about 100 ° C., and then supplied to the secondary granulated product to carry out a curing process.

At this time, the CO ₂ concentration and the moisture content of the flue gas was changed and supplied to the secondary granulated material to perform a curing process.

[Coating layer thickness change]

Secondary assemblies were prepared with varying thicknesses of the coating layers of 0.25 mm, 0.5 mm, 1.0 mm and 1.5 mm.

After curing the secondary granules thus prepared under the same conditions, the strength was measured. At this time, the strength represents the ratio of the granules having a particle size of 4 mm or more by dropping 300 g of granules having a particle size of 4 ~ 6.3 mm five times at a height of 2 m.

	Experimental Example 1	Experimental Example 2	Experimental Example 3	Experimental Example 4
Coating layer thickness (mm)	0.25	0.5	1.0	1.5
burglar(%)	80.9	83.7	85.3	85.5

Looking at Table 1, it can be seen that as the thickness of the coating layer increases, the strength of the assembly is improved. However, in Experimental Example 3, in which the thickness of the coating layer was 1.0 mm, and Experimental Example 4, in which the thickness of the coating layer was 1.5 mm, the strength of the granulated product was improved by about 0.2%. This can be seen that the degree of strength improvement is very small compared with the change in strength with respect to the thickness change amount according to Experimental Example 2 and Experimental Example 3. Therefore, considering that the strength of the granules which are not usually cured is about 75%, it is preferable to form the coating layer with a thickness of about 1 mm or less, preferably about 0.25 to 1 mm, in order to improve the strength of the granules.

[Change of CO ₂ Concentration in Flue Gas]

A secondary granule was prepared in which a coating layer of 1.0 mm was formed on the surface of the primary granule.

The secondary granules prepared as described above were supplied with exhaust gas to perform a curing process, but the curing process was performed while changing the concentration of CO _{2 in the} exhaust gas. Thereafter, the strength of the granulated material was measured, and the strength was measured in the same manner as in Experimental Examples 1 to 4.

	Experimental Example 5	Experimental Example 6	Experimental Example 7	Experimental Example 8
CO 2 concentration (%)	One	3	5	7
burglar(%)	76.5	84.3	85.5	85.1

Looking at Table 2, it can be seen that the strength of the granules is improved as the concentration of CO _{2 in} the exhaust gas increases. However, after the CO ₂ concentration in the flue gas increases to some extent, the strength of the granulated material is reduced. That is, the strength of the granulated product is increased up to about 5% of the CO ₂ concentration in the flue gas, but the strength of the granulated product is decreased when the CO ₂ concentration is 7%. However, even when the CO ₂ concentration is 7%, it shows excellent strength compared to the granulated material that has not undergone the curing process, and thus the curing process can be performed by controlling the CO ₂ concentration in the exhaust gas in the range of about 3 to 7%.

[Moisture Content Change in Flue Gas]

A secondary granule was prepared in which a coating layer of 1.0 mm was formed on the surface of the primary granule.

The secondary granules thus prepared were supplied with exhaust gas to perform a curing process, but the curing process was performed while changing the moisture content of the exhaust gas. Thereafter, the strength of the granulated material was measured, and the strength was measured in the same manner as in Experimental Examples 1 to 8.

	Experimental Example 9	Experimental Example 10	Experimental Example 11	Experimental Example 12
Moisture content (%)	3	5	10	15
burglar(%)	85.5	85.3	85.0	82.2

Looking at Table 3, it can be seen that the strength of the granules is lowered as the moisture content of the exhaust gas increases. The exhaust gas contains a certain amount of moisture, but there is a problem that it is difficult to completely remove it. Therefore, as shown in Table 3, even if the moisture contained in the flue gas to some extent does not significantly affect the strength of the granules, the granules can be cured by adjusting the moisture in the flue gas within a certain range, such as 3 to 10%. . Such moisture content control in the flue gas may be performed by introducing air to cool the flue gas.

As described above, in the detailed description of the present invention, specific embodiments have been described. However, various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

The raw material processing apparatus, the raw material processing method, and the granulated material produced using the same according to the present invention can be used as a blended raw material for producing a sintered ore.

Claims (23)

1. An apparatus for processing a raw material for producing a sintered ore,

   A primary granulator for assembling the iron fine powder and a binder to produce a primary granule;

   A secondary granulator for forming a secondary granule by forming a coating layer including at least one of quicklime and slaked lime on the surface of the primary granule;

   Curing machine to cure the secondary granules;

   Raw material processing apparatus comprising a.
2. The method according to claim 1,

   Raw material processing apparatus comprising a mixer for mixing the iron-containing fine powder raw material and the binder.
3. The method according to claim 2,

   The primary granulator and the secondary granulator comprises a water supply for supplying water.
4. The method according to claim 1 or 2,

   The curing apparatus includes a transfer path for transferring the secondary granules manufactured in the secondary granulator, and an exhaust gas feeder for supplying exhaust gas to the transfer path.
5. The method according to claim 4,

   The exhaust gas supply unit is a raw material processing device for supplying the exhaust gas generated in the lime firing process.
6. As a method of processing the raw material for the production of sintered ore,

   Preparing a fine iron-containing raw material and a binder;

   Mixing the iron-containing ultrafine powder and a binder in a mixer;

   Preparing a primary granule by injecting the iron-containing fine powder raw material and a binder into a primary granulator;

   Preparing at least one of the primary granules, quicklime (CaO) and slaked lime (Ca (OH) ₂ ) to a secondary granulator to produce a secondary granule; And

   Curing the secondary granules with CO ₂ ; Raw material processing method comprising a.
7. The method according to claim 6,

   The iron-containing fine powder raw material has a particle size of more than 0 mm to 4 mm or less.
8. The method according to claim 7,

   The iron-containing ultra-fine powder material is at least one of iron ore, pellet feed and steelmaking by-products.
9. The method according to claim 8,

   The binder is molasses, ultrafine limestone, bentonite, ladle slag, fly ash and at least one of a polymeric organic binder.
10. The method according to claim 9,

    The binder is 0.1 to 5% by weight based on the weight of the iron-containing fine powder raw material processing method.
11. The method according to claim 10,

    Raw material processing method for supplying moisture in the process of manufacturing the primary granules and the secondary granules.
12. The method according to claim 11,

    Raw material processing method for manufacturing the secondary granules to a size of 10mm or less in the process of manufacturing the secondary granules.
13. The method according to claim 12,

    Raw material processing method for supplying flue gas containing CO ₂ to the secondary granules in the curing process.
14. The method according to claim 13,

    The flue gas is a flue gas generated in the lime firing process.
15. The method according to claim 14,

    The flue gas has a CO ₂ concentration of 3 to 7%.
16. The method according to claim 14,

    The exhaust gas is a raw material processing method containing 3 to 10% moisture.
17. The method according to claim 14,

    Raw material processing method for supplying the exhaust gas of 50 to 100 ℃ to the secondary granules in the curing process.
18. The method according to claim 17,

    The curing process is carried out in the process of transferring to the reservoir for storing the secondary granulated material.
19. The method according to claim 18,

    Raw material processing method of forming a coating layer containing calcium carbonate on the surface of the primary granules in the curing process.
20. The granulated material manufactured by the raw material processing method in any one of Claims 6-19.
21. The method of claim 20,

    The granulated body is formed to a diameter of 10mm or less.
22. The method according to claim 21,

    The assembly is an assembly in which a coating layer having a thickness of 0.25 to 1 mm is formed on the surface.
23. The method according to claim 22,

    The coating layer granules containing calcium carbonate (CaCO ₃ ).

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