KR20170074591A

KR20170074591A - Coal briquettes and method for manufacturing the same

Info

Publication number: KR20170074591A
Application number: KR1020150184044A
Authority: KR
Inventors: 황동수; 송영훈; 김현정; 박우일; 조민영
Original assignee: 주식회사 포스코; 포항공과대학교 산학협력단
Priority date: 2015-12-22
Filing date: 2015-12-22
Publication date: 2017-06-30
Also published as: CN108350378A; WO2017111226A1; KR101839958B1

Abstract

The present invention relates to a method of manufacturing a molten steel that is charged into a dome of a melter-gasifying furnace and rapidly heated in a molten steel making furnace including a melter-gasifier furnished with reduced iron and a reducing furnace connected to the melter- The method for producing a molded coal according to an embodiment of the present invention includes the steps of providing pulverized coal, mixing a binder having a methoxy group and a crosslinking agent having at least two carboxyl groups to prepare a binder mixture; Mixing the pulverized coal and the binder mixture to produce a blended coal; And a step of molding the blended carbon to produce the molded carbon.

Description

TECHNICAL FIELD [0001] The present invention relates to a blanket,

And a method of manufacturing the same. More particularly, the present invention relates to a molded charcoal to which a binder having a methoxy group is applied while having excellent cold strength and a method for producing the same.

In the melt reduction steelmaking method, a melting furnace for melting iron ores and a reduced iron ore is used. When molten iron ore is melted in a melter-gasifier, molten coal is charged into the melter-gasifier as a heat source for melting iron ore. Here, the reduced iron is melted in a melter-gasifier, converted to molten iron and slag, and then discharged to the outside. The briquetted coal charged into the melter-gasifier furnishes a coal-filled bed. Oxygen is blown through the tuyere installed in the melter-gasifier, and then the coal-packed bed is combusted to generate combustion gas. The combustion gas is converted into a hot reducing gas while rising through the coal packed bed. The high-temperature reducing gas is discharged to the outside of the melter-gasifier and supplied to the reducing furnace as a reducing gas.

The briquettes used in the melting and reducing steelmaking process are fed to a melter-gasifier furnace to provide the amount of heat required for melting the reduced iron. The blast furnace ensures air permeability and liquid permeability in the melter-gasifier so that gas and liquid can pass smoothly. To achieve this, the blast furnace must be maintained at a large particle size within the melting-gasification furnace. In this case, the reduction reaction and the heat transfer efficiency for the reduced iron can be increased by the briquette.

Therefore, the manufactured briquettes must be resistant to mechanical shock during transportation. When the blast furnace is charged into the dome by melt gasification at a temperature of 1000 캜, the hot strength must be excellent to ensure the air permeability and permeability of the melt gasifier.

In order to secure excellent strength, a binder such as molasses is added as a binder in the process of manufacturing the molded bobbins to increase the strength. However, when a large amount of binder is used for ensuring sufficient strength, the cost of manufacturing the molded bodys is increased, causing adhesion in the manufacturing process, resulting in lowering of the operation rate of the equipment and deterioration of the quality.

Particularly, when molasses is used as a binder, cold strength is expressed through a " saccharate " reaction in which calcium ions are added in a coordination bond under basic conditions by adding limestone as a curing agent. However, a large amount of calcium ions is introduced into the limestone, and it is necessary to remove calcium in the preparation process.

And to provide a method for producing the same.

And then heat-treating the briquettes at 100 to 300 ° C.

Molding can be carried out at a temperature of 100 to 300 DEG C in the step of forming the blended coal to produce the molded coal.

The binder having a methoxy group may be selected from the group consisting of hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose (HEMC), methyl cellulose (MC), lignin, lignin sulfonate, And combinations of these.

The crosslinking agent having two or more carboxyl groups may include a dicarboxylic acid, a tricarboxylic acid, a polyacrylic acid, or a combination thereof.

The crosslinking agent having two or more carboxyl groups may be represented by the following formula (1).

[Chemical Formula 1]

X- (COOH) _n

Wherein X is a single bond, a divalent linking group selected from the group consisting of an alkylene group, an arylene group, a carbonyl group, -O-, -S-, -NH-, or a combination thereof, A trivalent linkage group in which a hydrogen atom is removed, and n is 2 or 3.)

The crosslinking agent having two or more carboxyl groups may be selected from the group consisting of ethanedioic acid, propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, succinic acid, But are not limited to, octanedioic acid, nonanedioic acid, decanedioic acid, benzene-1,2-dicarboxylic acid, o-phthalic acid, benzene-1,3-dicarboxylic acid, m-phthalic acid, benzene-1,4-dicarboxylic acid, citric acid, or a combination thereof.

Crosslinking agents having two or more carboxyl groups may include succinic acid, citric acid, or a combination thereof.

In the step of producing the compounded carbon, the compounded carbon may contain from 0.1 to 5% by weight of a binder having a methoxy group, from 0.1 to 5% by weight of a crosslinking agent having at least two carboxyl groups, from 1 to 15% by weight of water and the remainder.

In the step of producing the compounded carbon, the compounded carbon may contain 0.5 to 3% by weight of the binder having the methoxy group, 0.5 to 3% by weight of a crosslinking agent having at least two carboxyl groups, 5 to 10% by weight of moisture, .

The molded charcoal according to an embodiment of the present invention includes a binder having a methoxy group, a cross-linking agent having at least two carboxyl groups, water and pulverized coal.

The binder having a methoxy group may be selected from the group consisting of hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose (HEMC), methyl cellulose (MC), lignin, lignin Sulfonate, pectin, or a combination thereof.

The crosslinking agent having two or more carboxyl groups may include a compound represented by the following formula (1).

[Chemical Formula 1]

X- (COOH) _n

0.1 to 5 parts by weight of a binder having a methoxy group, 0.1 to 5% by weight of a crosslinking agent having two or more carboxyl groups, 1 to 15% by weight of water and finely pulverized coal.

0.5 to 3 parts by weight of a binder having a methoxy group, 0.5 to 3% by weight of a cross-linking agent having at least two carboxyl groups, 5 to 10% by weight of water and finely pulverized coal.

A cross-linking agent produced by a cross-linking reaction of a binder having a methoxy group and a cross-linking agent having at least two carboxyl groups.

According to an embodiment of the present invention, a molded charcoal having excellent cold strength can be produced.

Further, according to the embodiment of the present invention, there is no K component in the binder, so that clogging of the pipe does not occur.

In addition, according to one embodiment of the present invention, since the quicklime or the slaked lime is not used, the CO ₂ reactivity is lowered and the fuel efficiency of the coal is improved.

In addition, according to one embodiment of the present invention, the proportion of the binder is minimized, thereby improving the economical efficiency compared with the conventional binder.

Fig. 1 is a schematic flow chart of a method of manufacturing a briquette according to an embodiment of the present invention.
FIG. 2 is a schematic view of a molten iron manufacturing apparatus using the shaped coal produced in FIG.
FIG. 3 is a schematic view of another molten iron manufacturing apparatus using the shaped coal produced in FIG. 1. FIG.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, 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 for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

As used herein, unless otherwise defined, "substituted" means a C1 to C30 alkyl group; C1 to C10 alkylsilyl groups; A C3 to C30 cycloalkyl group; A C6 to C30 aryl group; A C2 to C30 heteroaryl group; A C1 to C10 alkoxy group; A C1 to C10 trifluoroalkyl group such as a fluoro group and a trifluoromethyl group; Or cyano group.

In the present specification, the term "combination thereof" means that two or more substituents are bonded to each other via a linking group or two or more substituents are condensed and bonded.

As used herein, unless otherwise defined, the term " alkyl group "means a" saturated alkyl group "which does not include any alkene or alkynyl group; Or an "unsaturated alkyl group" comprising at least one alkene group or alkyne group. Means a substituent in which at least two carbon atoms are composed of at least one carbon-carbon double bond, and "alkynyl group" means a substituent in which at least two carbon atoms are composed of at least one carbon-carbon triple bond . The alkyl group may be branched, straight-chain or cyclic.

The alkyl group may be a C1 to C20 alkyl group, more specifically a C1 to C6 lower alkyl group, a C7 to C10 intermediate alkyl group, or a C11 to C20 higher alkyl group.

For example, C1 to C4 alkyl groups mean that from 1 to 4 carbon atoms are present on the alkyl chain, which includes methyl, ethyl, propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl and t- Indicating that they are selected from the group.

Typical examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a t-butyl group, a pentyl group, a hexyl group, an ethenyl group, a propenyl group, a butenyl group, a cyclopropyl group, Pentyl group, cyclohexyl group, and the like.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically shows a flow chart of a method of manufacturing a briquette according to an embodiment of the present invention. The flow chart of the method of manufacturing the briquette of Fig. 1 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the method of manufacturing the briquette can be variously modified.

As shown in FIG. 1, the method for producing molded coal includes the steps of providing pulverized coal (S10), mixing a binder having a methoxy group and a crosslinking agent having two or more carboxyl groups (S20) A step (S30) of mixing the mixture to produce blended carbon, and a step (S40) of molding the blended carbon to produce blended carbon. In addition, if necessary, the method of manufacturing the molded coal may further include other steps.

First, in step S10, pulverized coal is provided. Here, the pulverized coal is pulverized coal. In general, the coal generally contains about 60% of carbon, about 70% of atan and lignite, about 70% to 80% of bituminous coal, about 80% to 90% Bituminous coal, and 90% or more anthracite. The type of coal used here is not particularly limited, and a single type of coal or various kinds of coal can be mixed and used. As a specific criterion, it is possible to use fine coal having a particle size distribution in which the grain size is 3 mm or less is 80 wt% or more and the grain size is 2 mm or less is 90 wt% or more. Water may be inevitably contained in the pulverized coal in an amount of 1 to 15 parts by weight per 100 parts by weight of the pulverized coal. The pulverized coal may be provided so as to be contained in an amount of 90 to 99% by weight based on 100% by weight of the molded coal to be produced.

Next, in step S20, a binder mixture having a methoxy group and a crosslinking agent having two or more carboxyl groups is mixed.

In one embodiment of the present invention, when methoxy group (CH ₃ -OC-) meets carboxyl group (-COOH), methanol is formed as a reactant and esterification occurs. Vaporization of methanol under heat conditions higher than the boiling point of methanol leads to a continuous reaction, thereby increasing the crosslinking efficiency. Accordingly, the molded coal according to one embodiment of the present invention can exhibit excellent cold strength. For example, when the binder is HEMC and the cross-linking agent is citric acid, the cross-linked product is formed by the reaction as shown in the following reaction formula, and the crosslinking efficiency is further increased.

[Reaction Scheme 1]

Hereinafter, the binder and the cross-linking agent will be described in more detail.

The binder has a methoxy group. Specifically, the binder may include a cellulose-based compound, a lignin-based compound, or a molasses-based compound. More specifically, the cellulose compound may include hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose (HEMC), or methyl cellulose (MC). As the lignin compound, lignin or lignin sulfonate may be included. As the molasses compound, pectin may be included. The binder may include a single kind of binder, or a combination of two or more kinds of binders. The binder may be mixed in an amount of 0.1 to 5% by weight based on 100% by weight of the briquette to be produced. If the amount of the binder is too small, the required cold strength may not be satisfied. Even if the amount of the binder is increased, the cold strength is not continuously improved. When the amount of the binder is too large, the amount of heat of the briquette is disadvantageous. Therefore, the amount of the binder can be adjusted within the range described above. More specifically 0.5 to 3% by weight based on 100% by weight of the blast furnace.

The crosslinking agent has two or more carboxyl groups. The crosslinking agent functions to increase the crosslinking efficiency by crosslinking the above-mentioned binder. And may specifically include dicarboxylic acid, tricarboxylic acid, polyacrylic acid, or a combination thereof. A dicarboxylic acid, and a tricarboxylic acid, and may specifically include a compound represented by the formula (1).

X- (COOH) _n

For example, when the cross-linking agent is a dicarboxylic acid, it is possible to use ethanedioic acid, propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, Octanedioic acid, nonanedioic acid, decanedioic acid, benzene-1,2-dicarboxylic acid, o-phthalic acid, benzene-1,3-dicarboxylic acid, acid, m-phthalic acid, or benzene-1,4-dicarboxylic acid, p-phthalic acid. When the crosslinking agent is tricarboxylic acid, it may contain citric acid. More specifically, the cross-linking agent may comprise succinic acid, citric acid or a combination thereof. As the cross-linking agent, a single type of cross-linking agent may be included, and two or more cross-linking agents may be combined. The cross-linking agent may be mixed in an amount of 0.1 to 5% by weight based on 100% by weight of the briquette to be produced. If the amount of the crosslinking agent is too small, the increase in crosslinking efficiency may be insignificant. Even if the amount of the cross-linking agent is increased, the cold strength is not continuously improved, and when the amount of the cross-linking agent is too large, it is disadvantageous in terms of the amount of heat of the briquette. Therefore, the amount of the crosslinking agent can be controlled within the above-mentioned range. More specifically 0.5 to 3% by weight based on 100% by weight of the blast furnace. The binder mixture may contain some moisture for smooth mixing of the binder and the crosslinking agent. Specifically 1 to 15 parts by weight with respect to 100 parts by weight of the binder mixture.

Returning again to FIG. 1, in step S30, the pulverized coal and the binder mixture are mixed to produce the blended coal.

The blend may contain 0.1 to 5% by weight of a binder having a methoxy group, 0.1 to 5% by weight of a crosslinking agent having at least two carboxyl groups, 1 to 15% by weight of water and finely pulverized coal. The reason for limiting the weight of the binder, the cross-linking agent and the pulverized coal is the same as that described above, so duplicate explanation is omitted. Moisture is inevitably derived from water contained in the pulverized coal in step S10 or from moisture added for smooth mixing in step S20. More specifically, the blend may contain 0.5 to 3% by weight of a binder having a methoxy group, 0.5 to 3% by weight of a cross-linking agent having at least two carboxyl groups, 5 to 10% by weight of water and finely pulverized coal.

Returning back to Fig. 1, in step S40, the blended coal is molded to produce a blast furnace.

Although not shown in FIG. 1, the mixture may be charged between two pairs of rolls rotating in mutually opposite directions to produce molded pellets or strips of shaped coal. As a result, it is possible to produce briquette having excellent hot strength and cold strength. Step S40 can be performed at a temperature of 100 to 300 占 폚. When molding is carried out in the above-mentioned range, the methoxy group in the binder and the carboxyl group in the cross-linking agent may undergo a cross-linking reaction to form a cross-linked product. The pressure may be maintained for 1 to 5 minutes in order to further improve the cold strength. At this time, the gas component such as methanol generated by the crosslinking reaction is removed, and the cold strength of the briquette is further improved.

After the step S40, the method may further include a step of heat-treating the molded body at 100 to 300 占 폚. The step of drying may further include the step of reacting the unreacted binder and the crosslinking agent present in the molded product to form a crosslinked product, thereby further improving the cold strength of the molded product. Specifically, the step of heat treatment may be performed for 5 to 120 minutes.

The molded charcoal according to an embodiment of the present invention includes a binder having a methoxy group, a cross-linking agent having at least two carboxyl groups, water and pulverized coal. The pulverized coal, the binder, the crosslinking agent, and the moisture, which are constituent components of the molded coal, are the same as those of the above-described method for producing molded coal, and thus repeated description thereof will be omitted. The molded carbon according to an embodiment of the present invention may further include a crosslinked product produced by a crosslinking reaction of a binder having a methoxy group and a crosslinking agent having two or more carboxyl groups. In the case of further comprising a crosslinked product, the portion derived from the binder having a methone group in the crosslinked product and the portion derived from the crosslinking agent having at least two carboxyl groups are calculated as the weight of the binder and the crosslinking agent, respectively.

Fig. 2 schematically shows a molten iron manufacturing apparatus 100 using the shaped coal produced in Fig. The structure of the apparatus for manufacturing molten iron 100 of FIG. 2 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the molten iron manufacturing apparatus 100 of FIG. 2 can be modified into various forms.

The molten iron manufacturing apparatus 100 of FIG. 2 includes a melter-gasifier 10 and a reduction furnace 20. Other devices may also be included if desired. In the reduction furnace 20, iron ore is charged and reduced. The iron ore to be charged into the reduction furnace 20 is preliminarily dried and then made into reduced iron through the reduction furnace 20. The reduction furnace 20 is a packed-bed reduction reactor, and a reducing gas is supplied from the melter-gasifier furnace 10 to form a packed bed therein.

Since the briquettes produced by the production method of Fig. 1 are charged into the melter-gasifier 10, a coal-filled layer is formed inside the melter-gasifier 10. A dome portion 101 is formed on the upper portion of the melter-gasifier 10. That is, a larger space is formed compared with other portions of the melter-gasifier 10, and a high-temperature reducing gas is present therein. Therefore, the briquettes charged into the dome portion 101 by the high-temperature reducing gas can be easily differentiated. However, since the blast furnace produced by the method of Fig. 1 has a high hot strength, it does not differentiate in the dome portion of the melter-gasifier 10 and falls down to the lower portion of the melter- The gas generated by the pyrolysis reaction of the blast furnace moves to the lower part of the melter-gasifier 10 and exothermically reacts with the oxygen supplied through the tuyere 30. As a result, the briquettes can be used as a heat source for keeping the melter-gasifier 10 at a high temperature. On the other hand, since the furnace provides air permeability, a large amount of gas generated in the lower portion of the melter-gasifier 10 and the reduced iron supplied from the reducing furnace 20 more easily and uniformly pass through the coal packed bed in the melter- .

The lump gasification furnace 10 may be charged with lumpy carbonaceous material or coke as needed in addition to the above-mentioned shaped coal. A tuyere (30) is installed on the outer wall of the melter-gasifier (10) to blow oxygen. Oxygen is blown into the coal packed bed to form a combustion zone. The briquettes can be burned in the combustion zone to generate reducing gas.

Fig. 3 schematically shows a molten iron manufacturing apparatus 200 using the shaped coal produced in Fig. The structure of the molten iron manufacturing apparatus 200 of FIG. 3 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the molten iron manufacturing apparatus 200 of FIG. 3 can be modified into various forms. The structure of the molten iron manufacturing apparatus 200 of FIG. 3 is similar to the structure of the molten iron manufacturing apparatus 100 of FIG. 2, and thus the same reference numerals are used for the same parts, and detailed description thereof is omitted.

3, the molten iron manufacturing apparatus 200 includes a melter-gasifier 10, a reduction reactor 22, a reduction iron compactor 40, and a compacted iron storage tank 50. Here, the compressed reduced iron storage tank 50 may be omitted.

The produced briquettes are charged into the melter-gasifier (10). Here, the briquetting gas generates a reducing gas in the melter-gasifier 10, and the generated reducing gas is supplied to the fluidized-bed reduction reactor. The minute iron ores are supplied to a plurality of reduction furnaces 22 having a fluidized bed and are made of reduced iron while flowing by the reducing gas supplied from the melter-gasifier 10 to the reduction furnaces 22. [ The reduced iron is compressed by the reduced iron compactor 40 and then stored in the compacted iron storage tank 50. The compressed reduced iron is supplied to the melter-gasifier 10 from the compressed-reduced iron storage tank 50 and melted in the melter-gasifier 10. A large amount of gas generated in the lower portion of the melter-gasifier 10 and the compressed reduced iron make the coal filler layer in the melter-gasifier 10 more easily and uniformly distributed in the melter-gasifier 10, So that a good quality molten iron can be produced.

Hereinafter, the present invention will be described in more detail with reference to experimental examples. These experimental examples are only for illustrating the present invention, and the present invention is not limited thereto.

Experimental Example One

16 kg of coal having a particle size of 3 mm or less and 90% or more with an average property was prepared as pulverized coal. The water content was adjusted to about 11 parts by weight with respect to 100 parts by weight of the pulverized coal.

1 part by weight of HEMC and 1 part by weight of citric acid were mixed with 100 parts by weight of pulverized coal to prepare a binder mixture.

The pulverized coal and the binder mixture were put into a mixer to prepare a blend. The compounded coal was compressed at a pressure of 1000 kg by using a mold to produce cylindrical shaped coal having a diameter of 20 mm and a height of 10 mm. The briquettes were heat-treated at 180 ° C for 10 minutes.

The strength of the briquettes was measured by the following evaluation method, and the results are summarized in Table 1 below.

Experimental Example 2

Except that 0.2 parts by weight of citric acid was mixed.

Experimental Example 3

Except that 2 parts by weight of citric acid was mixed.

Experimental Example 4

The procedure of Experimental Example 1 was repeated except that 1 part by weight of succinic acid was mixed instead of citric acid.

Experimental Example 5

Except that 2 parts by weight of succinic acid was used instead of citric acid.

Experimental Example 6

A binder mixture was prepared in the same manner as in Experimental Example 1.

The pulverized coal and the binder mixture were put into a mixer to prepare a blend. The compounded coal was compressed at a pressure of 1000 kg by using a mold to produce cylindrical shaped coal having a diameter of 20 mm and a height of 10 mm. At this time, the temperature of the mold was adjusted to 180 DEG C, and the mold was kept under pressure for 5 minutes.

Comparative Example One

10 parts by weight of molasses and 2.7 parts by weight of CaO were mixed with 100 parts by weight of the same pulverized coal as in Experimental Example 1 to prepare a binder mixture.

The pulverized coal and the binder mixture were put into a mixer to prepare a blend. The compounded coal was compressed at a pressure of 1000 kg by using a mold to produce cylindrical shaped coal having a diameter of 20 mm and a height of 10 mm.

Comparative Example 2

The same procedure as in Experimental Example 1 was carried out except that citric acid was not mixed.

Strength Evaluation Experiment

30 pieces of the briquettes prepared in Experimental Examples 1 to 4 and Comparative Examples 1 and 2 were immediately dried at room temperature for 1 hour, at room temperature for 24 hours, at 90 ° C for 10 minutes, or at 150 ° C for 10 minutes, And the maximum load was measured until it was broken by pushing it at a constant speed from the top.

Experiment result

Experimental results of the above-described Examples 1 to 4 and Comparative Examples 1 and 2 are shown in Table 1 below.

bookbinder Cross-linking agent Mold temperature Heat treatment presence or absence Strength (MPa) Experimental Example 1 HEMC (1 part by weight) Citric acid (1 part by weight) Room temperature U 10.9 Experimental Example 2 HEMC (1 part by weight) Citric acid (0.2 parts by weight) Room temperature U 10.2 Experimental Example 3 HEMC (1 part by weight) Citric acid (2 parts by weight) Room temperature U 12.0 Experimental Example 4 HEMC (1 part by weight) Succinic acid (1 part by weight) Room temperature U 11.2 Experimental Example 5 HEMC (1 part by weight) Succinic acid (2 parts by weight) Room temperature U 11.0 Experimental Example 6 HEMC (1 part by weight) Citric acid (1 part by weight) 180 DEG C radish 15.9 Comparative Example 1 Molasses (10 parts by weight) +
CaO (2.7 parts by weight) - Room temperature radish 7.9 Comparative Example 2 HEMC (1 part by weight) - Room temperature U 10.5

As shown in Table 1, it can be confirmed that the strength of the briquettes produced in Experimental Example is much better than that of Comparative Example 1. [ It can also be seen that when using an appropriate amount of crosslinking agent, the strength can be further improved as compared with the case where the binder is used alone.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. As will be understood by those skilled in the art. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10. Melting and gasification furnace
20, 22. Reduction furnace
30. Tungus
40. Reduction iron compression unit
50. Compressed reduced iron storage tank
100, 200. Molten iron manufacturing equipment
101. Dome

Claims

A melter-gasifier furnished with reduced iron, and
A reducing furnace connected to the melter-gasifier and providing the reduced iron;
Wherein the molten iron is charged into a dome of the melting and gasifying furnace and rapidly heated,
Providing pulverized coal,
Preparing a binder mixture by mixing a binder having a methoxy group and a crosslinking agent having at least two carboxyl groups;
Mixing the pulverized coal and the binder mixture to produce a blended coal; And
A step of molding the blend to produce a blast furnace
Wherein the method comprises the steps of:

The method according to claim 1,
Further comprising the step of heat-treating the briquettes at a temperature of 100 to 300 占 폚.

The method according to claim 1,
And molding the blended carbon at a temperature of 100 to 300 캜 in the step of forming the blended carbon.

The method according to claim 1,
The binder having a methoxy group may be selected from the group consisting of hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose (HEMC), methyl cellulose (MC), lignin, lignin sulfonate, And a combination thereof.

The method according to claim 1,
Wherein the crosslinking agent having two or more carboxyl groups comprises a dicarboxylic acid, a tricarboxylic acid, a polyacrylic acid, or a combination thereof.

The method according to claim 1,
Wherein the crosslinking agent having two or more carboxyl groups comprises a compound represented by the following formula (1).
[Chemical Formula 1]
X- (COOH) _n
Wherein X is a single bond, a divalent linking group selected from the group consisting of an alkylene group, an arylene group, a carbonyl group, -O-, -S-, -NH-, or a combination thereof, A trivalent linkage group in which a hydrogen atom is removed, and n is 2 or 3.)

The method according to claim 1,
The crosslinking agent having two or more carboxyl groups may be selected from the group consisting of ethanedioic acid, propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, Octanedioic acid, nonanedioic acid, decanedioic acid, benzene-1,2-dicarboxylic acid, o-phthalic acid, benzene-1,3-dicarboxylic acid m-phthalic acid, benzene-1,4-dicarboxylic acid, p-phthalic acid, citric acid, or a combination thereof.

8. The method of claim 7,
Wherein the cross-linking agent having two or more carboxyl groups comprises succinic acid, citric acid or a combination thereof.

The method according to claim 1,
In the step of producing the compounded carbon, the compounded carbon may contain 0.1 to 5 wt% of the binder having the methoxy group, 0.1 to 5 wt% of the crosslinking agent having at least two carboxyl groups, 1 to 15 wt% of water, Wherein said method comprises the steps of:

10. The method of claim 9,
In the step of producing the compounded carbon, the compounded carbon includes 0.5 to 3 wt% of the binder having the methoxy group, 0.5 to 3 wt% of the cross-linking agent having at least two carboxyl groups, 5 to 10 wt% Wherein said method comprises the steps of:

A melter-gasifier furnished with reduced iron, and
A reducing furnace connected to the melter-gasifier and providing the reduced iron;
Wherein the molten steel is charged into a dome of the melting and gasifying furnace and rapidly heated,
A binder having a methoxy group, a cross-linking agent having at least two carboxyl groups, moisture, and a carbon black.

12. The method of claim 11,
The binder having a methoxy group may be selected from the group consisting of hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose (HEMC), methyl cellulose (MC), lignin, Lignin sulfonate, pactin, or a combination thereof.

12. The method of claim 11,
The cross-linking agent having two or more carboxyl groups may be a dicarboxylic acid, a tricarboxylic acid, a polyacrylic acid, or a combination thereof.

12. The method of claim 11,
Wherein the crosslinking agent having two or more carboxyl groups comprises a compound represented by the following formula (1).
[Chemical Formula 1]
X- (COOH) _n
Wherein X is a single bond, a divalent linking group selected from the group consisting of an alkylene group, an arylene group, a carbonyl group, -O-, -S-, -NH-, or a combination thereof, A trivalent linkage group in which a hydrogen atom is removed, and n is 2 or 3.)

12. The method of claim 11,
The crosslinking agent having two or more carboxyl groups may be selected from the group consisting of ethanedioic acid, propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, Octanedioic acid, nonanedioic acid, decanedioic acid, benzene-1,2-dicarboxylic acid, o-phthalic acid, benzene-1,3-dicarboxylic acid , m-phthalic acid, benzene-1,4-dicarboxylic acid, p-phthalic acid, citric acid, or combinations thereof.

12. The method of claim 11,
The crosslinking agent having two or more carboxyl groups includes succinic acid, citric acid, or a combination thereof.

12. The method of claim 11,
0.1 to 5 parts by weight of a binder having the methoxy group, 0.1 to 5% by weight of a cross-linking agent having two or more carboxyl groups, 1 to 15% by weight of water, and finely pulverized coal.

18. The method of claim 17,
0.5 to 3 parts by weight of a binder having the methoxy group, 0.5 to 3% by weight of a cross-linking agent having at least two carboxyl groups, 5 to 10% by weight of moisture and powdered coal.

12. The method of claim 11,
Further comprising a crosslinked product produced by a crosslinking reaction between the binder having the methoxy group and the crosslinking agent having at least two carboxyl groups.