KR20130032436A - Formed coal using water-soluble binder and method for manufacturing the same - Google Patents

Abstract

PURPOSE: A method for manufacturing coal briquette is provided to enhance strength and compressive strength of coal by uniformly and strongly binding coal and powdered coal by a binder and to manufactured high strength coke. CONSTITUTION: Coal briquette contains: 100 parts by weight of a coal mixture containing one or two kinds among coal and powdered coal; and 3-10 parts by weight of a water soluble binder. The water soluble binder contains: 50-60 wt% of a first binder ingredient containing 60-70 wt% of a water soluble acryl emulsion and 30-40 wt% of polyvinyl alcohol solution; 15-25 wt% of one or more kinds among water soluble cellulose and gelatinized starch; and 15-25 wt% of glycerine. The coal mixture contains 5-10 wt% of moisture. The particle size of the powdered coal is 0.3 mm or less. [Reference numerals] (AA) Step of preparing a coal mixture; (BB) Step of spraying a water soluble binder into the coal mixture; (CC) Step of mixing the coal mixture and the water soluble binder; (DD) Step of pressurized-shaping the coal mixture and the water soluble binder;

Description

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

The present invention relates to a briquette used in the production of coke and a method of producing the same, and more particularly, to a briquette having a water-soluble binder added to a coal blend composed of pulverized coal and coal, and a method for producing the same.

Generally, the coking coal used for manufacturing the blast furnace cokes is transferred from the producing area to the final consuming area, and a considerable amount of dust is generated due to external environmental factors. In order to suppress the generation of dust, the raw coke contains a considerable amount of water due to environmental factors such as dry season, wet season or the like in the process of applying moisture to the raw coke or storing it in a yard.

Generally, the coke making coke making coal is reduced in moisture content and dried to increase the charging density in the coke furnace, thereby improving the strength of the coke and shortening the time required for the coke furnace to improve the productivity of the coke.

As described above, in order to improve the strength of the coke and improve the productivity, coking coal containing 8 to 12% by weight of water is reduced to a moisture content of about 5 to 6% by weight through a facility called CMCP (Coal Moisture Control Process) However, a considerable amount of pulverized coal (dust) is generated in the process for reducing or drying the water content, thereby deteriorating the working environment or causing a problem of water pollution in rivers and oceans .

In addition, the generation of pulverized coal leads to the loss of the raw coal, and the loss of the pulverized coal due to the pulverization reaches tens of tons per hour. Therefore, much research has been conducted on the development of techniques for appropriately recycling the pulverized coal generated.

Prior art relating to the use of pulverized coal includes, for example, the technology disclosed in Korean Patent Publication No. 10-0627469, which combines pulverulent lime with molasses as a water content modifier in pulverized coal, Which is excellent in strength and excellent in strength.

Also, the technology disclosed in Korean Patent Publication No. 10-0526131 relates to a blast furnace having excellent initial strength by combining a quick lime and a mixed liquid of condensed molasses solubles (CMS) and molasses in pulverized coal.

In addition, the technology disclosed in Korean Patent Publication No. 10-0407801 discloses a technique in which the pulverized coal is pulverized into a pulverized coal such as styrene, butadiene, styrene-butadiene rubber, asphalt, vinyl acetate, vinyl chloride, acrylate and methacrylate And polymerized resins obtained by combining at least one polymer resin.

However, the above prior arts can not be used as molding briquettes for coke production since they relate to metallurgical briquettes manufactured for use in FINEX and COREX processes, all of which are a type of melt reduction steelmaking process.

There is also a technique disclosed in Korean Patent Laid-Open Publication No. 2000-20926, wherein the pulverized coal is pulverized by pulverizing the pulverized coal with one or two or more selected from the group consisting of pitch, coal tar, bitumen, pulp residue, starch, The present invention relates to a molding coal used mainly as a heating fuel for a lime sintering plant, a bath house, a flower plant, a pepper drying plant, and a winter casting plant.

A prior art relating to a coke making molded coke is disclosed in Korean Patent Publication No. 10-866166. The above-mentioned technique is a technique of using one or more of heavy oil, pitch, and petroleum pitch of tar as a point binder in pulverized coal And then subjecting the resulting mixture to hot pressing.

However, since the prior art mineral oil has a high viscosity at room temperature, it can not easily be mixed with pulverized coal, and there are disadvantages in handling such as using a flammable organic solvent for viscosity control, Research on the briquette to solve this problem is required.

The present invention relates to a method of manufacturing a coal using pulverized coal and a method of manufacturing the same, wherein the pulverized coal is produced by a pulverizing process, .

One aspect of the present invention includes 100 parts by weight of a coal blend containing one or two of coal and pulverized coal, and 3 to 10 parts by weight of a water soluble binder, wherein the water soluble binder comprises (1) a water-soluble acrylic emulsion, a polyvinyl alcohol (PVA) (2) 15-25% by weight of a second binder component comprising one or two of water-soluble cellulose and starch, and (3) 15-25% by weight of glycerin. And the like.

The water content of the coal blend is preferably 5-10 wt%.

The content ratio of coal and pulverized coal in the coal blend is preferably 1: 0.8-1.2.

The particle size of the pulverized coal is preferably 0.3 mm or less.

Preferably, the first binder component comprises 60 to 70% by weight of a water-soluble acrylic emulsion and 30 to 40% by weight of an aqueous solution of PVA (polyvinyl alcohol).

The concentration of the PVA (polyvinyl alcohol) aqueous solution is preferably 3-10 wt%.

The concentration of the starch is preferably 5-10% by weight.

The glycerin is preferably selected from the group consisting of monoglyceride and diglyceride.

According to an aspect of the present invention, there is provided a method of producing a coal composition, comprising the steps of: preparing a coal blend containing one or two of coal and pulverized coal; spraying the water soluble binder so that 3 to 10 parts by weight of a water soluble binder is contained per 100 parts by weight of the coal blend; Uniformly mixing the coal blend and the water soluble binder; (1) 50 to 60% by weight of a first binder component comprising a water-soluble acrylic emulsion, a PVA (polyvinyl alcohol) aqueous solution, and (2) a second binder component comprising ) 15-25% by weight of a second binder component comprising one or two of water-soluble cellulose and starch, and (3) 15-25% by weight of glycerin.

Since the molded coal, which is one aspect of the present invention, is filled with pulverized coal between pores of porous coal and is formed by mixing with a binder, the strength of the pulverized coal is high and the coal and the pulverized coal are more uniformly and strongly bonded by the high penetration power of the binder, The cokes having higher strength can be produced. In addition, since the use of the water-soluble binder makes handling easier than mineral oil, productivity is greatly improved.

Particularly, the present invention improves the drop strength of a molded product, thereby preventing the degradation of the working environment due to the generation of dust as well as the economic effect by minimizing the drop of the molded product due to falling during the process of transferring the molded product to the blast furnace. It has a great effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of a method for producing a blast furnace according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail.

The present inventors have completed the present invention by studying and experimenting with a view that a binder for forming a molded article is made of a water-soluble acrylic resin, thereby maintaining a low viscosity even at room temperature, thereby remarkably increasing the mixing efficiency with the blast furnace.

In one embodiment of the present invention, the briquetting coal includes coal and pulverized coal and a water-soluble binder. Since the water-soluble binder having a low viscosity is uniformly dispersed in coal and pulverized coal, the pulverization of coal and pulverized coal is prevented, And thus exhibits improved physical properties, particularly excellent initial strength and drop strength.

The briquettes of the present invention include coal blends containing one or two of coal and pulverized coal. In the present invention, one or two kinds of pulverized coal and coal are included, which is referred to as a coal blend. The particle size of the pulverized coal used in the present invention is preferably 0.3 mm or less, and the pulverized coal preferably uses pulverized coal generated in a CMCP (Coal Moisture Control Process) process. Since the molded coal of the present invention is formed by mixing porous coal having voids formed thereon together with pulverized coal, the pulverized coal is filled with pulverized coal through the pores of coal in the mixing process of coal and pulverized coal, The drop strength is further improved.

The moisture content present in the coal blend is preferably 5-10 wt%. The reason for limiting the moisture content in the coal blend to a certain range is that blending and molding with the water-soluble binder within the range are easy and easy. If the water content is less than 5% by weight, it affects the formation of the coal blend and the water-soluble binder. If the water content in the coal blend exceeds 10% by weight, the effectiveness of the water-soluble binder is halved, It acts as a major factor in increasing the spermatogenesis rate.

On the other hand, the water content of the coal blend and the viscosity of the binder are closely related to the mixing efficiency. If the water content of the coal blend is 7 wt% to 8 wt%, the viscosity of the water soluble binder is lowered and if the water content of the coal blend is about 10 wt%, the viscosity of the water soluble binder can be increased to control the mixing efficiency.

The content ratio of coal and pulverized coal in the coal blend is preferably 1: 0.8-1.2, more preferably 1: 1.

Since the coal blend and the water-soluble binder each have their own characteristics, it is required to combine them in appropriate ratios in order to make the characteristics thereof and to form the optimum shaped coal. In order to determine the appropriate combination ratio, the present inventor has tried and found that the blended coal blended with 100 parts by weight of the coal blend and 3-10 parts by weight of the water soluble binder is most suitable. When the amount of the water-soluble binder is less than 3 parts by weight, the amount of the water-soluble binder is too small, and the water-soluble binder and the pulverized coal may not be uniformly mixed with each other. Even if the water-soluble binder is more than 10 parts by weight, the strength of the briquette is hardly changed. If the amount of the water-soluble binder is more than 20 parts by weight, adhesion between the water-soluble binder and the coal may occur on the equipment or the like, which may cause an obstacle to the molding of the molded body.

On the other hand, the water content of the coal blend and the viscosity of the binder are closely related to the mixing efficiency. If the water content of the coal blend is 7 wt% to 8 wt%, the viscosity of the water soluble binder is lowered and if the water content of the coal blend is about 10 wt%, the viscosity of the water soluble binder can be increased to control the mixing efficiency.

Unlike conventional solid binders, the water-soluble binder is a liquid binder which is used for producing molded bodys with high initial strength after press-molding by adding an adhesive force to oil rather than a method of imparting strength through drying.

The water-soluble binder includes (1) 50 to 60% by weight of a first binder component comprising a water-soluble acrylic emulsion, an aqueous solution of PVA (polyvinyl alcohol), and (2) a second binder comprising one or two of water-soluble cellulose and pregelatinized starch 15-25% by weight of the component and (3) 15-25% by weight of glycerin.

Preferably, the first binder component comprises 60 to 70% by weight of a water-soluble acrylic emulsion and 30 to 40% by weight of an aqueous solution of PVA (polyvinyl alcohol). The water-soluble acrylic emulsion is a commercially available water-soluble acrylic resin having a solid content of 40% and is in the form of an emulsion solution obtained by copolymerizing a small amount of monomers having an acrylic ester of an aliphatic alcohol as a main component and a polar group containing acrylic acid and acrylamide . The PVA aqueous solution is also widely commercially available, and it is preferable to use those having a degree of polymerization of 100 to 5000 and a degree of saponification of 30 to 99.8. The concentration is preferably 3-10 wt%.

The present invention can easily control the viscosity without using any other organic solvent used for controlling the viscosity of the high viscosity mineral oil by selecting an emulsion type binder such as a water-soluble acrylic emulsion, and the binder is added to the coal blend It is possible to mix the coal blend and the binder more uniformly. In addition, since the emulsion solution is an emulsion solution, the binder is impregnated into the coal blend by the action of the surfactant and is uniformly mixed and molded, thereby exhibiting an effect of further improving the compressive strength of the briquette.

In addition, the second binder component includes one or two of water-soluble cellulose and starch. The content ratio of the water-soluble cellulose and the starch is not particularly limited in the present invention. The water-soluble cellulose or the starch has the effect of improving the initial strength of the briquette to contain the binding force of the first binder component. Examples of the water-soluble cellulose include hydroxypropylcellulose, hydroxymethylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose and methylcellulose, and one or more of these may be selected and used.

However, the concentration of the starch is preferably 5-10% by weight.

As the glycerin, glycerin containing a fatty acid group can be used. Specifically, monoglyceride (glycerin having one group of a fatty acid) or glycerin containing a fatty acid residue such as diglyceride can be preferably used. Glycerin is a component added to control the viscosity and flowability of a binder composed of the above water-soluble acrylic emulsion and PVA (polyvinyl alcohol) aqueous solution, and also shows an effect of preventing the drying of the briquette

On the other hand, as the above-mentioned glycerin, eco-friendly raw materials which can be obtained from waste such as waste cooking oil can be used. At this time, since the physical properties of the resin are changed depending on the properties of the raw material, it is preferable to use a long oil-based condensation resin having a large oil content in the resin reaction in order to increase the air drying property and flexibility as a pressure-sensitive adhesive oil. This is because the monoglyceride (in which glycerin has one group of fatty acid) or diglyceride is obtained as a subsidiary product in the acid treatment process of waste cooking oil or biodiesel process produced from waste cooking oil, rapeseed oil, soybean oil, palm oil and the like .

According to another embodiment of the present invention, there is provided a method of manufacturing a shaped coal including coal and the water-soluble binder. FIG. 1 is a flow chart showing a method for producing a molded coal according to the present invention. Hereinafter, a method for producing a molded coal will be described in detail with reference to FIG. The matters described in the description of the above-mentioned briquettes are applied to the method of producing briquette.

As shown in FIG. 1, the water-soluble binder having low viscosity is uniformly dispersed in coal by mixing coal and a water-soluble binder and press-molding them at room temperature, thereby preventing the coal from clustering and improving the mixing efficiency of coal and water- Molded articles having excellent physical properties, particularly excellent and uniform drop strength and initial strength.

In detail, a water-soluble binder is sprayed so that the water-soluble binder is 3 to 10 parts by weight per 100 parts by weight of one or two kinds of coal blends of coal and pulverized coal. Water content in the coal blend is maintained at 5-10 wt%. Since these water-soluble binders and the critical meaning of the water are the same as those described above, detailed description thereof will be omitted.

At this time, the temperature of the water-soluble binder is sprayed into the coal blend at 60 to 70 ° C. Here, the reason why the temperature of the water-soluble binder is maintained at 60 to 70 ° C is that the viscosity of the water-soluble binder is released so as to produce a molded coal having high initial strength after molding due to the adhesive force between the coal compound and the water-soluble binder.

Thereafter, the sprayed water-soluble binder and the coal blend are uniformly mixed. At this time, the coals are aggregated in the form of powder in the form of lumps through the adhesive force of the water-soluble binder. When the water-soluble binder and the coal blend are uniformly mixed, the mixed coal blend and the water-soluble binder are pressure-molded at room temperature. The press molding may be performed under the press molding conditions generally used in the production of molded products, and is not particularly limited in the present invention.

As described above, in the present invention, unlike the conventional binder, the adhesive strength of the water-soluble binder is added by adding pressure without drying, and pressure molding is carried out, whereby the briquette having high initial strength can be produced.

Hereinafter, the present invention will be described more specifically by way of examples. It should be noted, however, that the following examples are intended to illustrate the invention in more detail and not to limit the scope of the invention. The scope of the present invention is determined by the matters set forth in the claims and the matters reasonably inferred therefrom.

(Example)

20% of a starch mixture (concentration 8% by weight) and 35% by weight of a water-soluble acrylic emulsion and 25% by weight of a PVA aqueous solution (concentration 5% by weight) were stirred at 65 캜 and heated to introduce glycerin. .

Further, a primary mixture containing 35% by weight of a water-soluble acrylic emulsion and 25% by weight of an aqueous solution of PVA (concentration 5% by weight) and 20% of carboxylmethylcellulose were stirred at 65 캜 and heated to prepare a binder B after charging glycerin .

Coal charcoal having an average particle size of 3 mm, a water content of 8 to 12 wt%, and a water content of 5, which satisfies a particle size distribution of 0.3 mm or less and 1 to 1 weight ratio of pulverized coal having a moisture content of 1-3 wt% 7, and 9 wt%, the binder was uniformly sprayed, mixed, and then pressure-molded to produce 10 pieces of molded coal (90 g units), and the compressive strength and drop strength were experimentally shown in Table 1 below.

division Moisture Content of Briquette (wt%) Binder type and content (parts by weight) Compressive strength (Kgf) Differentiation rate (%) Inventory 1 5 Binder A, 5 12.099 16.4 Inventory 2 7 Binder A, 5 16.754 13.8 Inventory 3 9 Binder A, 5 19.283 10.6 Honorable 4 5 Binder B, 7 14.032 14.6 Inventory 5 7 Binder B, 7 20.021 10.1 Inventory 6 9 Binder B, 7 23.043 8.7

The drop strength is expressed by the fractionation rate based on the fragment size of the briquette formed by the physical impact generated by dropping the briquette at a constant height. The drop strength is expressed as the fraction of the differentiated fragments of size 3 mm or less Is expressed as a percentage.

(%) = (The total weight of the differentiated pieces of 3 mm or less / the weight of the initial molded-in pieces) x 100

The differentiation rate test is to drop the weight of 90g of the briquettes at a height of 5 ~ 6m from the ground, and to show the total weight of the differentiated pieces as a percentage of the weight of 90g of the briquette.

(Example 2)

Coal charcoal having an average particle size of 3 mm, a water content of 8 to 12 wt%, and a water content of 5, which satisfies a particle size distribution of 0.3 mm or less and 1 to 1 weight ratio of pulverized coal having a moisture content of 1-3 wt% 7, and 9% by weight of the coal blend were press molded to prepare 10 pieces of molded coal (90 g units) to test the drop strength. When the moisture content of the molded coal was 5% by weight (Comparative Example 1), the differentiation rate was 70.6%. When the moisture content of the molded coal was 7% by weight (Comparative Example 2), the differentiation rate was 58.2% It was found that when the water content was 9 wt% (Comparative Example 3), the differentiation rate was 51.6%, which is significantly higher than Examples 1 to 6 of Example 1. Through this, it can be confirmed that when the binder is not supplied, the briquette easily collapses and pulverized coal can be generated.

Claims (9)

100 parts by weight of a coal blend containing one or two of coal and pulverized coal, and 3 to 10 parts by weight of a water-soluble binder,
The water-soluble binder includes (1) 50 to 60% by weight of a first binder component comprising a water-soluble acrylic emulsion, an aqueous solution of PVA (polyvinyl alcohol), and (2) a second binder comprising one or two of water-soluble cellulose and pregelatinized starch 15-25% by weight of component (A) and 15-25% by weight of glycerin.
The method according to claim 1,
Wherein the water content of the coal blend is 5-10 wt%.
The method according to claim 1,
Wherein the content ratio of coal and pulverized coal in the coal blend is 1: 0.8-1.2.
The method according to claim 1,
Wherein the particle size of the pulverized coal is 0.3 mm or less.
The method according to claim 1,
Wherein the first binder component comprises 60-70 wt% water-soluble acrylic emulsion and 30-40 wt% aqueous solution of PVA (polyvinyl alcohol).
The method according to claim 1,
Wherein the concentration of the PVA (polyvinyl alcohol) aqueous solution is 3-10 wt%.
The method according to claim 1,
Wherein the concentration of the starch granules is 5-10 wt%.
The method according to claim 1,
Wherein the glycerin is selected from the group consisting of monoglycerides and diglycerides.
Preparing a coal blend comprising one or two of coal and pulverized coal;
Spraying the water-soluble binder so that 3 to 10 parts by weight of a water-soluble binder is contained in 100 parts by weight of the coal blend;
Uniformly mixing the coal blend and the water soluble binder; And
Press-molding the mixed coal blend and the water-soluble binder,
The water-soluble binder includes (1) 50 to 60% by weight of a first binder component comprising a water-soluble acrylic emulsion, an aqueous solution of PVA (polyvinyl alcohol), and (2) a second binder comprising one or two of water-soluble cellulose and pregelatinized starch 15-25% by weight of component (A) and 15-25% by weight of glycerin.

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