KR101634071B1 - Coal briquettes and method for manufacturing the same - Google Patents

Abstract

Provided are coal briquette and a production method thereof. the coal briquette is charged into and rapidly heated in a dome part of a melting and gasification furnace into which reduced iron is charged, in a molten iron production device comprising the melting and gasification furnace and a reduction furnace which is connected to the melting and gasification furnace and to which the reduced iron is provided. The method for producing coal briquette includes the following steps: providing pulverized coal; providing a mixture in which 3-15 parts by weight of syrup and 0.01-1 parts by weight of formaldehyde, glutaraldehyde, or paraformaldehyde with respect to 100 parts by weight of the pulverized coal; and molding the mixture.

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 briquette having excellent cold strength and a low content of calcium ions 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.

Since a large amount of briquettes is required for mass production of molten iron, the briquettes produced are outdoors. In this case, since the briquette can be broken by an external impact, it is necessary to increase the cold strength of the briquette.

The present invention provides a method for producing a shaped coal having a high cold strength and a low calcium ion content.

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- (10) providing pulverized coal according to an embodiment of the present invention comprises the steps of providing pulverized coal (S10), adding 3 to 15 parts by weight of molasses and 0.01 to 1 part by weight of formaldehyde, glutaraldehyde or para Mixing the formaldehyde to provide a mixture (S20), and molding the mixture (S30).

Mixing the paraformaldehyde in the step of preparing the mixture to prepare a mixture, and heat-treating the mixture after the step of preparing the mixture.

Mixing the paraformaldehyde in the step of preparing the mixture, and heat-treating the mixture after molding the mixture.

The heat treatment temperature in the step of heat treatment may be 40 캜 to 120 캜. Specifically, the heat treatment temperature may be from 57 캜 to 100 캜.

In the step of preparing the mixture, 1 to 3 parts by weight of quicklime may be further mixed with 100 parts by weight of the pulverized coal.

In the step of preparing the mixture, the molasses amount may be 3 parts by weight to 8 parts by weight.

And a reducing furnace connected to the melter-gasifier for supplying reduced iron to the dome of the melter-gasifying furnace to rapidly heat the melter-gasifier. Examples of the molded coal include pulverized coal, 3 to 15 parts by weight molasses, and 0.01 to 1 part by weight of formaldehyde, glutaraldehyde or paraformaldehyde based on 100 parts by weight of the pulverized coal.

1 to 3 parts by weight of the quicklime may be further added to 100 parts by weight of the pulverized coal.

The amount of molasses may be 3 parts by weight to 8 parts by weight.

The amount of formaldehyde, glutaraldehyde or paraformaldehyde may be 0.05 part by weight to 0.5 part by weight.

It is possible to produce a shaped coal having a desired level of cold strength even if a small amount of molasses is used.

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.

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), adding 3 to 15 parts by weight of molasses and 0.01 to 1 part by weight of formaldehyde, glutaraldehyde Or paraformaldehyde to provide a mixture (S20), and molding the mixture (S30). 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 is not particularly limited, and may be a single coal or a mixture of various coal.

Next, in step S20, a mixture obtained by mixing molasses with molasses and formaldehyde, glutaraldehyde or paraformaldehyde is provided. Here, the amount of molasses may be 3 parts by weight to 15 parts by weight based on 100 parts by weight of the pulverized coal. When the amount of molasses is too small, the cold strength of the briquette can be deteriorated. Further, when the amount of molasses is too large, problems such as adherence occur when mixing pulverized coal and molasses. Therefore, the molasses amount is adjusted to the above-mentioned range. More specifically, molasses may be used in an amount of 3 to 8 parts by weight based on 100 parts by weight of the pulverized coal.

0.01 to 1 part by weight of formaldehyde, glutaraldehyde or paraformaldehyde is added to 100 parts by weight of the pulverized coal. Formaldehyde, glutaraldehyde, or paraformaldehyde can be used to produce briquette having excellent cold strength even when molasses is reduced. When the amount of formaldehyde or paraformaldehyde is too small, the cold strength of the briquette is not sufficiently improved. In addition, when the amount of formaldehyde or paraformaldehyde is too large, formaldehyde may leak out and worsen the working environment, or glutaldehyde or paraformaldehyde may clump together during operation, resulting in clogging in operation Accordingly, the amount of formaldehyde, glutaraldehyde or paraformaldehyde is adjusted to the above-mentioned range. More specifically, the addition amount of formaldehyde, glutaraldehyde or paraformaldehyde may be 0.05 part by weight to 0.5 part by weight based on 100 parts by weight of the pulverized coal.

Formaldehyde bridges the sugar in the molasses through the aldehyde group, thereby improving the cold strength of the briquette. Therefore, some or all of the quicklime can be substituted. When replacing quicklime with formaldehyde, glutaraldehyde or paraformaldehyde, only a small amount of quicklime may be used. More specifically, the blast furnace may comprise 1 to 5 parts by weight of quicklime with respect to 100 parts by weight of the pulverized coal.

Formaldehyde can be added directly to the briquette, but it is volatile and toxic if inhaled for long periods of time, so paraformaldehyde, which is not volatile as a powder, can be added to the briquette. In the case of adding paraformaldehyde, the mixture may be heat-treated after step (S20) or heat-treated after the step (S30) to decompose paraformaldehyde into formaldehyde. Further, the heat treatment may be performed after step S20 and step S30, respectively. The heat treatment temperature may be 40 占 폚 to 120 占 폚, more specifically 57 占 폚 to 100 占 폚. When the heat treatment temperature is too low, paraformaldehyde is difficult to decompose into formaldehyde, so that the cold strength of the briquette can not be sufficiently improved. In addition, when the heat treatment temperature is too high, the briquettes can be differentiated. Therefore, the heat treatment temperature is adjusted to the above-mentioned range.

Finally, in step S30, the mixture is molded. 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.

The molded coal produced in FIG. 1 contains 3 to 15 parts by weight of molten powder with respect to 100 parts by weight of pulverized coal and pulverized coal, and 0.01 to 1 part by weight of formaldehyde, glutaraldehyde or paraformaldehyde with respect to 100 parts by weight of pulverized coal. do. Since the molasses is crosslinked through the aldehyde group, the adhesion of the molasses is further improved, so that the cold strength of the briquette is increased compared to that of the coal containing only pulverized coal and molasses. Further, the calcium oxide can be partially or wholly replaced, so that the content of calcium ions in the briquettes can be reduced. As a result, the briquettes produced in Fig. 1 are excellent in cold strength and the removal of calcium ions is unnecessary in a post-process.

When replacing quicklime with formaldehyde, glutaraldehyde or paraformaldehyde, only a small amount of quicklime may be used. Specifically, it may further comprise 1 to 3 parts by weight of quicklime based on 100 parts by weight of pulverized coal.

The briquettes produced in Fig. 1 have increased cold strength of the briquettes compared to the briquettes containing only pulverized coal and molasses, so even if a small amount of molasses is added, the same cold strength can be obtained. Specifically, the molasses may include 3 to 8 parts by weight. Formaldehyde, glutaraldehyde or paraformaldehyde may be included in an amount of 0.05 to 0.5 parts by weight.

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 can 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 reduced 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 1

Coal A having an average particle size of 3.4 mm or less was prepared as fine coal. 10 parts by weight of molasses and 0.05 part by weight of paraformaldehyde were mixed with 100 parts by weight of coal A. The properties of the coal A used are shown in Table 1 below.

Industrial analysis, dry base weight% Ashes (Ash) Volatile matter (VM) Fixed Carbon Coal A 9.1 25.1 65.8

The mixture was compressed with a roll press to produce briquetted shaped briquettes having a size of 64.5 mm X 25.4 mm X 19.1 mm. The molded briquettes were heat-treated at 100 占 폚 for 1 hour and the cold strength of the briquettes was measured by the following evaluation method.

Method of measuring cold strength

Thirty pieces of the manufactured briquettes were fixed at the bottom and pressed at a constant speed at the top to measure the maximum load until breaking.

Experimental Example 2

0.125 parts by weight of paraformaldehyde was mixed with 100 parts by weight of coal A. [ The rest of the experiment was carried out in the same manner as in Experimental Example 1.

Experimental Example 3

0.25 parts by weight of paraformaldehyde was mixed with 100 parts by weight of coal A. [ The rest of the experiment was carried out in the same manner as in Experimental Example 1.

Experimental Example 4

0.5 part by weight of paraformaldehyde was mixed with 100 parts by weight of coal A. [ The rest of the experiment was carried out in the same manner as in Experimental Example 1.

Comparative Example 1

Paraformaldehyde was not added, and 2.7 parts by weight of quicklime was mixed with 100 parts by weight of coal A. [ The rest of the experiment was carried out in the same manner as in Experimental Example 1.

Experiment result

Experimental results of the briquettes according to the above-described Experimental Examples 1 to 4 and Comparative Example 1 are summarized in Table 2 below.

Pulverized coal
(Parts by weight) molasses
(Parts by weight) quicklime
(Parts by weight) Paraformaldehyde
(Parts by weight) Heat treatment temperature after mixing
(° C) Heat treatment temperature after molding
(° C) Cold strength
(MPa) Experimental Example 1 100 10 × 0.05 × 100 50 Experimental Example 2 100 10 × 0.125 × 100 63 Experimental Example 3 100 10 × 0.25 × 100 53 Experimental Example 4 100 10 × 0.5 × 100 55 Comparative Example 1 100 10 2.7 × × 100 24

As shown in Table 2, the molded bodies of Experiments 1 to 4 prepared by adding paraformaldehyde had a higher cold strength than the molded bodies of Comparative Example 1, which was prepared by adding quicklime without adding paraformaldehyde And it was confirmed that it is superior.

Experimental Example 5

10 parts by weight of molasses and 0.05 part by weight of paraformaldehyde were mixed with 100 parts by weight of coal A to prepare a mixture. The mixture was prepared and then heat treated at 55 ° C for 1 hour. The mixture was compressed with a roll press to produce briquetted shaped briquettes having a size of 64.5 mm X 25.4 mm X 19.1 mm. The manufactured briquettes were naturally dried to measure the cold strength of the briquette. The remaining experimental procedure was the same as Experimental Example 1 described above.

Experimental Example 6

0.125 parts by weight of paraformaldehyde was mixed with 100 parts by weight of coal A to prepare a mixture. The mixture was prepared and then heat treated at 59 ° C for 1 hour. The remaining experimental procedure was the same as Experimental Example 5 described above.

Experimental Example 7

Coal A, molasses and paraformaldehyde were mixed to prepare a mixture and then heat-treated at 37 ° C for 1 hour. The remaining experimental procedure was the same as Experimental Example 5 described above.

Experimental Example 8

Coal A, molasses and paraformaldehyde were mixed to prepare a mixture and then heat-treated at 37 ° C for 1 hour. The remaining experimental procedure was the same as Experimental Example 6 described above.

Comparative Example 2

Paraformaldehyde was not added, and 2.7 parts by weight of quicklime was mixed with 100 parts by weight of coal A. [ The mixture was prepared by mixing coal A, molasses and quicklime and then heat treated at 45 ° C for 1 hour. The remaining experimental procedure was the same as Experimental Example 5 described above.

Experiment result

The experimental results of the above-described Examples 5 to 8 and Comparative Example 2 are summarized in Table 3 below.

Pulverized coal
(Parts by weight) molasses
(Parts by weight) quicklime
(Parts by weight) Paraformaldehyde
(Parts by weight) Heat treatment temperature after mixing
(° C) Heat treatment temperature after molding
(° C) Cold strength
(MPa) Experimental Example 5 100 10 × 0.05 55 × 16 Experimental Example 6 100 10 × 0.125 59 × 53 Experimental Example 7 100 10 × 0.05 37 × 6 Experimental Example 8 100 10 × 0.125 37 × 7 Comparative Example 2 100 10 2.7 × 45 × 23

As shown in Table 3, only the molded carbon of Experimental Example 6 was superior in cold strength to the molded carbon of Comparative Example 2, and the molded bodies of the other experimental examples were found to be poor in cold strength I could. This is because, when the heat treatment temperature is lower than 55 ° C, paraformaldehyde is difficult to decompose into formaldehyde and the effect of adding paraformaldehyde is not exhibited.

Experimental Example 9

After forming the briquettes, they were heat-treated at 100 ° C for 1 hour. The remaining experimental procedure was the same as that of Experimental Example 7 described above.

Experimental Example 10

After forming the briquettes, they were heat-treated at 100 ° C for 1 hour. The remaining experimental procedures were the same as those of Experimental Example 8 described above.

Comparative Example 3

After forming the briquettes, they were heat-treated at 100 ° C for 1 hour. The remaining experimental procedure was the same as that of Comparative Example 2 described above.

Experiment result

The experimental results of the above-described Examples 9 to 10 and Comparative Example 3 are shown in Table 4 below.

Pulverized coal
(Parts by weight) molasses
(Parts by weight) quicklime
(Parts by weight) Paraformaldehyde
(Parts by weight) Heat treatment temperature after mixing
(° C) Heat treatment temperature after molding
(° C) Cold strength
(MPa) Experimental Example 9 100 10 × 0.05 37 100 28 Experimental Example 10 100 10 × 0.125 37 100 24 Comparative Example 3 100 10 2.7 × 45 100 15

As shown in Table 4, it was confirmed that the molded cells of Experiments 9 and 10 were superior in cold strength to those of Comparative Example 3.

Experimental Example 11

10 parts by weight of molasses, 2.7 parts by weight of burnt lime and 0.25 parts by weight of paraformaldehyde were mixed with 100 parts by weight of coal A to prepare a mixture. The mixture was heat treated at 100 占 폚 for 1 hour and compressed with a roll press to produce briquetted shaped briquettes having a size of 64.5 mm X 25.4 mm X 19.1 mm. The manufactured briquettes were naturally dried to measure the cold strength of the briquette. The remaining experimental procedure was the same as Experimental Example 1 described above.

Experimental Example 12

After forming the briquettes, they were heat-treated at 100 ° C for 1 hour. The remaining experimental procedure was the same as Experimental Example 11 described above.

Experimental Example 13

0.5 part by weight of paraformaldehyde was mixed with 100 parts by weight of coal A. [ The remaining experimental procedure was the same as Experimental Example 11 described above.

Experimental Example 14

After forming the briquettes, they were heat-treated at 100 ° C for 1 hour. The remaining experimental procedure was the same as Experimental Example 13 described above.

Comparative Example 4

Formaldehyde was not mixed. The rest of the experiment was carried out in the same manner as in Experimental Example 11.

Comparative Example 5

Formaldehyde was not mixed. The rest of the experiment was carried out in the same manner as in Experimental Example 12.

Experiment result

Experimental Examples 11 to 14 and Comparative Example 4 and Comparative Example 5 are summarized in Table 5 below.

Pulverized coal
(Parts by weight) molasses
(Parts by weight) quicklime
(Parts by weight) Paraformaldehyde
(Parts by weight) Heat treatment temperature after mixing
(° C) Heat treatment temperature after molding
(° C) Cold strength
(MPa) Experimental Example 11 100 10 2.7 0.25 100 × 34 Experimental Example 12 100 10 2.7 0.25 100 100 28 Experimental Example 13 100 10 2.7 0.5 100 × 40 Experimental Example 14 100 10 2.7 0.5 100 100 28 Comparative Example 4 100 10 2.7 × 100 × 25 Comparative Example 5 100 10 2.7 × 100 100 26

 As shown in Table 5, even when some quicklime was added, the molded bodies of Examples 11 to 14, in which paraformaldehyde was added, had a cold strength higher than that of Comparative Example 4 and Comparative Example 5 in which paraformaldehyde was not added And it was confirmed that it is excellent.

Experimental Example 15

Molten iron was added to coal A in an amount of 7.5 parts by weight. The remaining experimental procedure was the same as in Experimental Example 2.

Experimental Example 16

5 parts by weight of molasses was added to Coal A. The remaining experimental procedure was the same as in Experimental Example 2.

Experiment result

Experimental Example 2, Experimental Example 15, Experimental Example 16 and Comparative Example 1 Experimental results of the molded charcoal are shown in Table 6 below.

Pulverized coal
(Parts by weight) molasses
(Parts by weight) quicklime
(Parts by weight) Paraformaldehyde
(Parts by weight) Heat treatment temperature during mixing
(° C) Heat treatment temperature after molding
(° C) Cold strength
(MPa) Experimental Example 2 100 10 × 0.125 × 100 63 Experimental Example 15 100 7.5 × 0.125 × 100 33 Experimental Example 16 100 5 × 0.125 × 100 18 Comparative Example 1 100 10 2.7 × × 100 24

As shown in Table 6, it was confirmed that when paraformaldehyde was added, the molded coal having a cold strength similar to or superior to that of Comparative Example 1 could be produced even when molasses was slightly added.

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 (11)

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,
Mixing 3 to 15 parts by weight of molasses and 0.05 to 0.5 parts by weight of formaldehyde, glutaraldehyde or paraformaldehyde with respect to 100 parts by weight of the pulverized coal to provide a mixture, and
Molding the mixture
Wherein the method comprises the steps of: The method according to claim 1,
Further comprising the step of preparing the mixture by mixing the paraformaldehyde in the step of preparing the mixture, and then heat-treating the mixture after the step of preparing the mixture. The method according to claim 1,
Further comprising the step of mixing the paraformaldehyde in the step of producing the mixture and heat-treating the mixture after the step of molding the mixture. The method according to claim 2 or 3,
Wherein the heat treatment temperature in the step of heat-treating the mixture is 40 占 폚 to 120 占 폚. 5. The method of claim 4,
Wherein the heat treatment temperature is in a range of 57 ° C to 100 ° C. The method according to claim 1,
Wherein the step of preparing the mixture further comprises mixing 1 to 5 parts by weight of quicklime with respect to 100 parts by weight of the pulverized coal. The method according to claim 1,
Wherein the amount of molasses in the step of preparing the mixture is 3 parts by weight to 8 parts by weight. 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,
Pulverized coal,
3 to 15 parts by weight of molasses relative to 100 parts by weight of the pulverized coal, and
0.05 to 0.5 parts by weight of formaldehyde, glutaraldehyde or paraformaldehyde
Lt; / RTI > 9. The method of claim 8,
And further comprising 1 to 3 parts by weight of quicklime based on 100 parts by weight of the pulverized coal. 9. The method of claim 8,
And the amount of the molasses is 3 to 8 parts by weight. delete

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