KR20170068327A

KR20170068327A - Coal briquettes and method for manufacturing the same

Info

Publication number: KR20170068327A
Application number: KR1020150175386A
Authority: KR
Inventors: 김현정; 박우일; 박석인; 조민영
Original assignee: 주식회사 포스코
Priority date: 2015-12-09
Filing date: 2015-12-09
Publication date: 2017-06-19
Also published as: KR101797738B1

Abstract

There is provided a molten steel producing apparatus including a melter-gasifier furnished with reduced iron, and a reducing furnace connected to the melter-gasifier furnishing a reduced iron, the molten iron being charged into the dome of the melter- The method for producing molded coal includes the steps of providing pulverized coal, preparing a binder mixture by mixing starch, lignin, an aqueous acid solution, and water, producing a blended coal by mixing pulverized coal and a binder mixture, . &Lt; / RTI >

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 using bioplastics with a high hot 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.

Molded coal is produced by mixing coal and binder. In this case, molasses is used as a binder. The molasses content varies depending on the region of origin and it is difficult to control the content of the molasses according to the sugar manufacturing process. Therefore, when molten carbonate is used as a binder, the quality of the molten carbonate can not be constantly controlled. Particularly, when molasses having a high water content is used, the quality of the briquette is deteriorated.

In addition, recently, in the case of the molding coal used for the high-temperature operation of a melter-gasifier furnished with a large size, a characteristic of higher hot strength is required. Therefore, although the blended coal having high hot strength is produced by using additives such as petroleum coke and anthracite coal, the ash content of the blended coal is increased.

The present invention relates to a method for producing a molded carbon having superior heat strength by applying bioplastics and alternating between starch and lignin, and a method for producing the same.

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, preparing a binder mixture by mixing starch, lignin, an aqueous acid solution and water; 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.

In the step of preparing the binder mixture, 10 to 40% by weight of starch, 10 to 40% by weight of starch, 0.01 to 5% by weight of an aqueous acid solution, and the balance may be mixed with 100% by weight of the binder mixture. More specifically, in the step of preparing the binder mixture, 25 to 35% by weight of starch, 25 to 35% by weight of starch, 0.1 to 1% by weight of an aqueous acid solution, and the balance may be mixed with 100% by weight of the binder mixture.

The concentration of the acid aqueous solution may be 1 to 10% by weight.

The aqueous acid solution may contain at least one of citric acid, acetic acid, lactic acid, malic acid, tartaric acid and ascorbic acid.

The binder mixture may have a pH of from 3 to 6.

Lignin can be obtained by hydrolyzing lignocellulosic biomass into acid.

The lignin may have a weight average molecular weight of 5,000 to 20,000.

In the step of producing the blend, 90 to 99% by weight of the pulverized coal and 1 to 10% by weight of the binder mixture may be mixed with 100% by weight of the blend. Specifically, it may contain 95 to 98% by weight of pulverized coal and 2 to 5% by weight of a binder mixture.

The step of preparing the compounded carbon may be carried out at a temperature of 55 to 200 ° C.

The step of preparing the compounded carbon may include a first mixing step in which mixing is performed at a temperature of 55 to 65 ° C and a second mixing step in which mixing is performed at a temperature of 65 to 200 ° C after the first mixing step .

After the step of producing the molded charcoal, the step of drying the molded charcoal at 100 to 200 DEG C for 10 to 20 minutes may be further included.

The briquette according to an embodiment of the present invention includes 1 to 10% by weight of bioplastics, 1 to 10% by weight of lignin, 3 to 15% by weight of water, and the balance of coal.

Specifically, it may contain 3.5 to 5% by weight of bioplastics, 3.5 to 5% by weight of lignin, 5 to 10% by weight of water and the balance coal.

The bioplastic may be composed of 40 wt% or less of amylopectin and 60 wt% or more of amylose. Specifically, the bioplastic may comprise 25 to 35% by weight of amylopectin and 65 to 75% by weight of amylose.

Lignin may have a weight average molecular weight of 5000 to 20,000.

According to one embodiment of the present invention, the briquette having excellent 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.

According to an embodiment of the present invention, the lignin is not decomposed at 300 DEG C but acts as a binder, thereby improving the hot strength.

Fig. 1 is a schematic flow chart of a method of manufacturing a briquette according to an embodiment of the present invention.
2 is a view showing the chemical structure of lignin used in one embodiment of the present invention.
3 is a view showing the conversion of amylopectin to amylose and the principle of formation of starch and bioplastics.
4 is a schematic view of an apparatus for producing a briquette according to an embodiment of the present invention.
FIG. 5 is a schematic view of a molten iron manufacturing apparatus using the shaped coal produced in FIG. 1. FIG.
Fig. 6 is a schematic view of another molten iron manufacturing apparatus using the briquettes 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), mixing a starch, lignin, aqueous acid solution and water to prepare a binder mixture (S20), mixing the pulverized coal and the binder mixture A step (S30) of producing compounded carbon, and a step (S40) of molding compounded carbon to produce a molded 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. In order to reduce variation in quality, it is preferable that the particle size of the pulverized coal is constant, and as a specific criterion, pulverized coal having a particle size distribution of not more than 3 mm in size of 80 wt% or more and a particle size of 5 mm or less in 90 wt% or more can be used.

Next, in step S20, starch, lignin, an aqueous acid solution and water are mixed to prepare a binder mixture. Lignin alone has little or no CHAR reaction. However, when bioplastics are mixed, the alkyl group of bioplastics reacts with lignin to form CHAR effectively. According to one embodiment of the present invention, the bioplastics that have already been manufactured are mixed directly with the pulverized coal to be used as a binder of the blast furnace, and the starch, the aqueous acid solution and water serving as raw materials for the bioplastics are prepared as a binder mixture, In step S30 and the like, it is mixed with pulverized coal, and at the same time, it is synthesized into a bioplastic, thereby serving as a binder for a molded carbon. In the case of mixing already produced bioplastics with pulverized coal directly, it is not smoothly applied to the surface of pulverized coal, and it is necessary to re-melt the bioplastics at high temperature. At this time, the re-melted bio-plastic has a low elastic restoring force, so that the strength of the molded-in-mold is immediately lowered. On the other hand, in one embodiment of the present invention, bioplastics are synthesized by preparing a starch mixture, an aqueous acid solution and water as a raw material in a binder mixture, and a step (S30) to be described later to smoothly coat the surface of the pulverized coal, So that it becomes possible to immediately improve the strength of the briquette.

The starch is composed of 20 to 30% by weight of amylose and 70 to 80% by weight of amylopectin. Amylose is a linear Helix structure, so it is elastic and can be effectively applied to the medium. Also, since it is applied at a high density, it is very efficient as a binder. However, amylopectin has a branched structure and is hard to be effectively applied to a substance to be bound. In addition, since the branch structure has low contrast density in the linear structure, the strength of the binder portion after binding is weak, so it is vulnerable to deformation due to external pressure, and viscoelastic ability is weak. In an embodiment of the present invention, the starch is synthesized with bioplastics in step S30 and the like, the amylose structure favorable as a binder is increased, the amylopectin structure is reduced, and the cold strength and hot strength of the briquette are improved.

The starch may be mixed with 10 to 40% by weight of starch, based on 100% by weight of the binder mixture. If too much starch is involved, uniform mixing of the starch and aqueous acid solution may become difficult. If the starch is included too little, the binding effect may be negligible. Therefore, the mixing amount of the starch can be adjusted to the aforementioned range. More specifically, 25 to 35% by weight of the starch may be mixed with 100% by weight of the binder mixture.

The acid aqueous solution serves to transform starch into bioplastics in step S30 and the like to be described later. Acidic aqueous solutions include acids and water. The acid may be at least one of citric acid, acetic acid, lactic acid, malic acid, tartaric acid and ascorbic acid.

The concentration of the acid aqueous solution may be 1 to 10% by weight.

The acid aqueous solution may be mixed with 0.01 to 5% by weight of 100% by weight of the binder mixture, more specifically 0.1 to 1% by weight. The remainder can become water.

The pH of the binder mixture may be from 3 to 6. If the pH of the binder mixture is too high, it may be difficult to appropriately obtain the viscoelasticity of the bio-plastic. If the pH of the binder mixture is too low, the viscoelasticity of the bioplastics may be reduced and corrosion of the equipment may occur. Thus, the pH can be adjusted to the above-mentioned range. More specifically, the pH of the binder mixture may be from 4 to 5.

In addition, in step S20, lignin is added as a binder component as well as starch, an aqueous acid solution and water which are raw materials for bioplastics. When the bioplastics are pyrolyzed at 300 ° C or less, when the bioplastics are used alone as the binder, the hot strength of the briquettes can not be sufficiently secured. On the other hand, since the lignin remains at 800 DEG C, the strength of the lignin can be improved even at a high temperature.

Lignin is not particularly limited, and can be obtained by hydrolyzing a lignocellulosic biomass with an acid. The weight average molecular weight of the lignin may be from 5,000 to 20,000. More specifically, lignin may be a lignin partially substituted with a sulfone group (SO ₃ ^- ) as shown in FIG. 2. Since lignin partially substituted with a sulfone group is easily dissolved in water, it can be easily dispersed in a binder mixture, and the strength of the briquette can be further improved.

Step S20 may be performed at a temperature of 5 to 50 占 폚. If the temperature is too high, the starch may be transformed into bioplastics before being mixed with the pulverized coal in a step S30 to be described later.

Steps S10 and S20 described above are independent steps, and step S20 may be performed before step S10, or steps S10 and S20 may be performed at the same time.

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

90 to 99% by weight of pulverized coal and 1 to 10% by weight of a binder mixture may be mixed with 100% by weight of the blend coal. If the binder mixture is mixed too little, the strength of the briquette may be lowered. Even if the binder mixture is mixed too much, there is a limit to improvement in the strength of the briquette, and the moisture present in the binder may deteriorate the quality of the briquette. Therefore, the mixing amount of the binder mixture can be adjusted to the aforementioned range. More specifically, 95 to 98% by weight of the pulverized coal and 2 to 5% by weight of the binder mixture may be mixed with 100% by weight of the blend.

Step S30 may be performed at a temperature of 55 to 200 占 폚. Step S30 is performed at an appropriate temperature so that the starch can be transformed into a bio-plastic.

The mechanism by which starch is transformed into bioplastics is explained in detail.

Amylose and amylopectin present in starch are in a crystal structure. Amylose is linear and amylopectin is a structure with amylose structure. Adding heat to it and adding water will cause the water to penetrate into the crystal. At room temperature, it is difficult for water to penetrate between crystals. Water penetrating between crystals binds amylose and amylopectin by hydrogen bonding. Amylopectin is formed into amylose by branching off with acid. When the water penetrates into the amylose crystal gap, the hydrogen bonding occurs, and the hydrophilic group OH group is directed outward by the hydrophilic group hydrophobic interaction and the hydrophobic C-C bond is directed inward, and the structure is deformed into the Helix structure. It forms a double helix structure centered on polar lipids by bonding with polar lipids present in starch. A helix that is not associated with polar lipids has a double helix structure between helixes. In the case of Amylos, too, it is shared with the double helix, and the water is discharged to form a crystal structure.

The mechanism by which amylopectin changes to amylose is as follows. Amylose is made up of alpha 1,4-bonding of glucose. Amylopectin has a main backbone structure consisting of 1,4-bonding and a branch structure connected to the skeletal structure through alpha 1,6-bonding.

Conversion of specific amylopectin to amylose and the principle of formation of starch and bioplastics are shown in Fig.

At pH 4 to 5 and above 50 ° C, alpha 1,4-bonding is not incised, whereas α-1,6-bonding is incisional. Therefore, α-1,6-bonding incision is possible selectively in the presence of acid. It is therefore possible to dissect amylopectin branches and make them linear to amylose-like lines

Through such a process, a bioplastic composed of 60 wt% or less of amylopectin and 40 wt% or more of amylose can be synthesized. More specifically, the bioplastic comprises 25 to 35% by weight of amylopectin and 65 to 75% by weight of amylose. Bioplastics have a relatively high density, so that the strength of the briquettes increases and linear molecules form a helix structure, which enables effective adhesion to the surface of pulverized coal.

The chemical structure and properties of amylopectin and amylose are summarized in Table 1 below.

ingredient Amylopectin Amylose Chemical structure

Macro
-structure

Binder related properties Gelized and referred to as binder
Weak intensity due to low density
Cohesion is high
Low Adhesion Capability Increased density due to higher density
Formation of helix structure by hydrophilic and hydrophobic phenomena of linear molecules →
Effective cohesion on Coal surface Reforming principle The α-1,6-bond of amylopectin is formed by the geometry that is easy to decompose compared to α-1,4-bond
→ pH 4-5 Removal of branches by α-1,6-bond incision → transformation to amylose

Step S30 may include a first mixing step of mixing at a temperature of 55 to 65 DEG C and a second step of mixing at a temperature of 65 to 200 DEG C after the first mixing step.

In step S30 and step S40, a method of supplying additional water in the form of steam may be used to raise the temperature. At this time, steam can be supplied from the heat cylinder.

Returning again to FIG. 1, in step S40, the coal charcoal and the binder mixture are mixed to produce a blend.

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.

After step S40, the step may further include drying the molded body at 100 to 200 DEG C for 10 to 20 minutes. The step of drying may further include adjusting the moisture present in the blast furnace to include 3 to 15% by weight of water relative to 100% by weight of the blast furnace. The strength of the briquette can be improved in the above-mentioned range.

The bodyshell according to one embodiment of the present invention comprises 1 to 10% by weight of bioplastics, 1 to 10% by weight of lignin, 3 to 15% by weight of water and the balance of coal, wherein the bioplastic contains at least 40% by weight of amylopectin and And 60% or less by weight of amylose. The bodyshell according to one embodiment of the present invention has excellent strength due to the viscoelasticity of the bio-plastic.

More specifically, it may contain 3.5 to 5% by weight of bioplastics, 3.5 to 5% by weight of lignin, 5 to 10% by weight of water, and the balance coal.

More specifically, the bioplastic may comprise 25 to 35% by weight of amylopectin and 65 to 75% by weight of amylose.

Fig. 4 schematically shows an apparatus for producing a molded coal to which the method for producing molded coal shown in Fig. 1 is applied. The structure of the apparatus for producing molded articles of Fig. 4 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the apparatus for producing molded articles of Fig. 4 can be modified into various forms.

The apparatus for producing molded-on-a-carbon includes bins (1, 2, 3, 4). Bin (1, 2, 3, 4) supplies starch, lignin, aqueous acid solution and water. The bins 1, 2, 3 and 4 are connected to the binder mixer 6 and the starch, lignin, aqueous acid solution and water supplied from the bins 1, 2, 3 and 4 are mixed in the binder mixer 6 . At this time, the binder mixer 6 is maintained at a temperature of 5 to 50 캜 to prevent the starch from being deformed into the bio-plastic.

The binder mixer 6 is connected to the mixer mixer 7 and supplies the binder mixture to the mixer mixer 7. Further, the compounding-tank mixer 7 is supplied with pulverized coal from the pulverized coal bins 5. The compounding carbon mixer 7 mixes the supplied pulverized coal and the binder mixture, and supplies the mixed compounding coal to the kneader 8. The compounding tank mixer 7 can maintain a temperature of 55 to 65 占 폚. At this time, as a means for raising the temperature, the temperature of the compounding tank mixer 7 can be increased through the steam supplied from the heat cylinder.

The compounded coal supplied from the compounding tank mixer 7 is agitated through the kneader 8 for a certain period of time. At this time, the temperature of the kneader is maintained at 65 to 200 DEG C, and the starch in the mixture can be transformed into bioplastic. It can be agitated in the kneader 8 for 3 minutes or more. At this time, as a means for increasing the temperature, the temperature of the kneader 8 can be increased through the steam supplied from the heat cylinder.

The blended carbon blended in the kneader 8 is supplied to the molding machine 9 to be molded into a blast furnace. The molding machine 9 can be operated at -5 DEG C or higher. More specifically, it can be operated at room temperature.

Fig. 5 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. 5 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the apparatus for manufacturing molten iron 100 of FIG. 5 can be modified into various forms.

The molten iron manufacturing apparatus 100 of FIG. 5 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. 6 schematically shows a molten iron manufacturing apparatus 200 using the briquettes manufactured in Fig. The structure of the molten iron manufacturing apparatus 200 of FIG. 6 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the molten iron manufacturing apparatus 200 of FIG. 6 can be modified into various forms. Since the structure of the molten iron manufacturing apparatus 200 of FIG. 6 is similar to that of the molten iron manufacturing apparatus 100 of FIG. 5, the same reference numerals are used for the same parts, and a detailed description thereof will be omitted.

6, the molten iron manufacturing apparatus 200 includes a melter-gasifier 10, a reducing furnace 22, a reduced iron compactor 40, and a compacted iron storage tank 50. As shown in FIG. 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

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.

A binder mixture was prepared by mixing starch, lignin, water, and an aqueous 5 wt% acetic acid solution with 100 parts by weight of pulverized coal at the blending ratios set forth in Table 2 below. The temperature of the prepared binder mixture was maintained at 45 占 폚.

About 1.5 kg of pulverized coal and binder mixture was put into a mixer, and the temperature inside the mixer was adjusted to 60 캜 and mixed for 3 minutes. Then, the mixture was put into a kneader and the temperature inside the kneader was adjusted to 70 캜 for 10 minutes. At this time, the mixer and the kneader were heated through steam.

The blended carbon was compressed by a roll press to produce briquetted briquettes having a size of 64.5 mm X 25.4 mm X 19.1 mm. The compressive strength, drop strength, hot impact test and tensile strength test of the briquettes were measured by the following evaluation method.

The molded coal produced in Experimental Example 1 is finely pulverized. Then stir in water for about one day. It is then filtered to separate coal and solvent. The obtained solvent is concentrated by 10% using rotary evaporation. Then drop the iodine solution.

Calculate the color ratio using UV Spectrum. Analysis of the bioplastics present in the blast furnace in this manner confirmed that the amylose contained 70 wt% and the amylopectin contained 30 wt%.

Experimental Examples 2 to 4

The procedure of Experimental Example 1 was repeated, except that starch, lignin, water, and 5 wt% aqueous acetic acid solution were mixed at the blending ratios shown in Table 2 below to prepare a binder mixture.

Comparative Example 1

The procedure of Experimental Example 1 was repeated except that starch, water, and acetic acid aqueous solution were not used and only starch was mixed at the blending ratios set forth in Table 2 below.

Comparative Example 2

The procedure of Experimental Example 1 was repeated except that the starch, the water and the aqueous acetic acid solution were mixed at the blending ratios set forth in Table 2 below to prepare a binder mixture.

Compression 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.

Drop strength evaluation experiment

The briquettes produced in Experimental Examples 1 to 4 and Comparative Examples 1 and 2 were dropped at a height of 50 m from the ground 4 times or 8 times after 1 hour at room temperature and 24 hours at room temperature to maintain a shape of 20 mm or more The weight ratio is expressed as a percentage of the total weight of the molded can.

Hot shock test

The briquettes produced in Experimental Examples 1 to 4 and Comparative Examples 1 and 2 were rotated at 1000 rpm for 45 minutes at 2 rpm. Then, the weight ratio of the briquettes maintaining the shape with a particle size of 10 mm or more is expressed as a percentage of the weight of the whole briquette.

촤 Strength test

After the hot shock test, 200 g of the sample is spun at 2 rpm for 30 minutes. The weight ratio of the briquettes maintaining the shape with a particle size of 10 mm or more is expressed as a percentage of the weight of the briquette before the test.

Experiment result

Experimental results of the above-described Examples 1 to 4 and Comparative Examples 1 and 2 are shown in Table 3 below.

Comparative Example 1 Experimental Example 1 Experimental Example 2 Experimental Example 3 Experimental Example 4 Comparative Example 2 Mixing ratio
(Weight ratio) Bioplastics water 0 2.0 2.0 1.0 2.0 2.0 Starch 0 2.0 1.0 1.0 1,0 2.0 5 wt% acetic acid 0 0.5 0.25 0.25 0.25 0.5 Lignin 4.0 2.0 3.0 2.0 2.0 0

Comparative Example 1 Experimental Example 1 Experimental Example 2 Experimental Example 3 Experimental Example 4 Comparative Example 2 Compressive strength
(Kgf) Immediately 28.9 40.2 35.5 34.1 33.1 28.9 1 hour at room temperature 50.1 60.2 58.3 57.2 57.5 50.1 Drop strength
(%) 4 times 1 hours 90.1 95.4 93.1 94.1 93.5 89.1 24 hours 85.5 94.6 92.1 92.5 92.1 84.5 8 times 1 hours 85.1 85.2 80.1 81.2 81.3 83.1 24 hours 85.2 90.1 82.1 82.1 81.2 82.2 촤 Differentiation test (%) 85 98 97 96 96 85 Hot Shock Test (%) 80 98 97 95 96 80

As shown in Table 3, it can be seen that the compression and drop strengths of the briquettes produced in the Experimental Example are superior to those of Comparative Examples 1 and 2 using only bioplastics or only lignin as a binder. Particularly, it was confirmed that the hot shock test and the 촤 differentiation test showing the hot strength were far superior to those of Comparative Example 1 and Comparative Example 2 using only bioplastics or using only lignin as a binder.

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.

1-5. empty
6. Binder Mixer
7. Mixing Tank Mixer
8. Kneader
9. Molding machine
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 starch, lignin, acid aqueous solution and water to prepare a binder mixture;
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,
In the step of preparing the binder mixture, 10 to 40% by weight of starch, 10 to 40% by weight of lignin, 0.01 to 5% by weight of an aqueous acid solution, and water are mixed with 100% by weight of the binder mixture .

3. The method of claim 2,
In the step of producing the binder mixture, 25 to 35% by weight of starch, 25 to 35% by weight of lignin, 0.1 to 1% by weight of an aqueous acid solution, and water are mixed with 100% by weight of the binder mixture .

The method according to claim 1,
Wherein the concentration of the acid aqueous solution is 1 to 10% by weight.

The method according to claim 1,
Wherein the acid aqueous solution comprises at least one of citric acid, acetic acid, lactic acid, malic acid, tartaric acid, and ascorbic acid.

The method according to claim 1,
Wherein the binder mixture has a pH of from 3 to 6.

The method according to claim 1,
Wherein the lignin is obtained by hydrolyzing a lignocellulosic biomass with an acid.

The method according to claim 1,
Wherein the lignin has a weight average molecular weight of 5,000 to 20,000.

The method according to claim 1,
In the step of producing the blend, 90 to 99% by weight of the pulverized coal and 1 to 10% by weight of the binder blend are mixed with respect to 100% by weight of the blend.

10. The method of claim 9,
Wherein 95 to 98% by weight of the pulverized coal and 2 to 5% by weight of the binder mixture are mixed with respect to 100% by weight of the blended carbon in the step of producing the blended carbon.

The method according to claim 1,
Wherein the mixing is carried out at a temperature of 55 to 200 캜.

The method according to claim 1,
Wherein the step of preparing the compounded carbon includes a first mixing step of mixing at a temperature of 55 to 65 ° C and a second mixing step of mixing at a temperature of 65 to 200 ° C after the first mixing step &Lt; / RTI >

The method according to claim 1,
Further comprising the step of, after the step of producing the molded charcoal, drying the molded charcoal at 100 to 200 ° C for 10 to 20 minutes.

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,
1 to 10% by weight of bioplastic, 1 to 10% by weight of lignin, 3 to 15% by weight of water and coal as the balance.

15. The method of claim 14,
3.5 to 5% by weight of the bioplastic, 3.5 to 5% by weight of the lignin, 5 to 10% by weight of the moisture, and the balance coal.

15. The method of claim 14,
Wherein the bioplastic comprises 40 wt% or less of amylopectin and 60 wt% or more of amylose.

15. The method of claim 14,
Wherein the bioplastic comprises 25 to 35% by weight of amylopectin and 65 to 75% by weight of amylose.

15. The method of claim 14,
Wherein the lignin has a weight average molecular weight of 5,000 to 20,000.