KR20200081781A - Method for Manufacturing of briquettes using coal and finecoal - Google Patents

Abstract

The present invention relates to briquette using dust coal to manufacture cokes and a manufacturing method thereof. More specifically, according to the present invention, the briquette used for manufacturing cokes comprises 1 to 20 parts by weight of a binder with respect to 100 parts by weight of a briquette material including dust coal. The binder comprises: 50 to 80 weight percent of a polyvinyl acetate solution; 10 to 40 weight percent of polyol; 2 to 20 weight percent of a surfactant; and 1 to 5 weight percent of a hydrophile synthetic polymer. Moreover, the manufacturing method comprises the following steps: preparing a briquette material including dust coal and coal; adding a binder to the briquette material to uniformly mix the mixture; and press-molding the mixture. According to the present invention, an emulsion-polymerized binder is used for manufacturing the briquette, thereby maintaining a constant quality without being affected by an external environment, such as weather, temperature, and the like, in particular, a molding strength.

Description

Method for manufacturing of briquettes using coal and finecoal}

The present invention relates to coal briquettes using pulverized coal used for coke production and a method for manufacturing the same, and more specifically, coal briquettes using pulverized coal used for coke production that can maintain a constant quality even when the external environment changes. It relates to a manufacturing method.

In general, raw coal (coal) used for the production of coke for blast furnaces generates a considerable amount of dust, including spontaneous ignition, due to factors of the external environment in the process of being transported from the production site to the final consumption site.

However, since these dusts can cause fire and air pollution, it is necessary to apply moisture several times to suppress the occurrence, and even in the process of being exposed to and stored in the yard of the consumption site, raw coal is caused by environmental factors such as dry season or rainy season. Silver contains a significant amount of moisture inside.

Therefore, the raw petroleum coke for manufacturing coke is usually reduced or dried in water, thereby increasing the loading density in the coke oven to improve the strength of coke, as well as shortening the drying time to improve the productivity of coke. .

As described above, to improve the strength and productivity of coke, raw coals containing about 8 to 12% moisture are reduced or dried to a moisture content of about 5 to 6% through a facility called Coal Moisture Control Process (CMCP). It is used in the production of coke. However, since a considerable amount of dust (dust) is generated in the process of reducing or drying the moisture content, it not only causes a deterioration of the working environment and water pollution of rivers and oceans, but also the generation of pulverized coal as raw coal Since the loss of raw coal has reached several tens of tons per hour, much research has been conducted on technology development to promote proper recycling of pulverized coal.

As a prior art related to the use of pulverized coal, for example, in Korean Registered Patent Publication No. 10-0627469, a combination of quicklime and molasses as a regulator of moisture content in pulverized coal has excellent low-temperature stability and excellent strength at low temperatures without drying or heating. Disclosed is a coal briquette excellent in initial strength by combining a mixture of raw lime, lysine CMS (Condensed Molasses Solubles) and molasses with pulverized coal in Korean Registered Patent Publication No. 10-0526131. In addition, in Korean Patent Registration No. 10-0407801, one or more polymer resins selected from the group consisting of styrene, butadiene, styrene-butadiene rubber, asphalt, vinyl acetate, vinyl chloride, acrylate, and methacrylate are combined with pulverized coal. Although disclosed in relation to the coal briquettes to be manufactured, all of the above-mentioned prior arts are related to the metallurgical coal briquettes manufactured for use in the FINEX and COREX processes, which are a kind of the molten reduction steelmaking process. It is not suitable to apply.

In addition, Korean Patent Publication No. 2000-20926 discloses coal briquettes manufactured by combining one or more mixtures selected from the group consisting of pulverized coal, pitch, coal tar, bitumen, pulp residue, starch, black sugar and molasses. It relates to coal briquettes mainly used as heating fuel, such as limestone success sites, baths, flower complexes, pepper drying complexes, and winter foundries, and it is also not suitable to apply to coal briquettes for coke production.

On the other hand, as a prior art for coal briquettes using pulverized coal used in the production of coke, according to Korean Patent Registration No. 10-866166, one or two types of heavy oil, soft pitch and petroleum pitch of tar as a binder for pulverized coal. The above is added, and the coking coal produced by hot press molding is disclosed, but the above-mentioned mineral oil of the prior art has a high viscosity at room temperature, so mixing with pulverized coal is not easy, and a flammable organic solvent is used for viscosity adjustment. When handling lamps, there are many disadvantages such as risks and hazards, so there are many problems in facility management and productivity.

Therefore, in order to improve the disadvantages of handling properties when using high-viscosity mineral oil as a caking agent, recently, pulverized coal and raw coal (coal) are molded with a binder composed of a water-soluble caking additive PVA (polyvinyl alcohol) and polyhydric alcohol. One coal briquette was patented as Patent No. 10-1198619, but the coal briquettes disclosed in the above-mentioned prior art have weak initial molding strength and contain a large amount of hydrophilic caking additives, thereby forming the molding strength according to the external environment such as climate and temperature. There is a problem that is easily affected.

Republic of Korea Patent Publication No. 10-1998-0051191 (Publication date: 1998.09.15)

The present invention is to provide a coal briquette and a method of manufacturing the same that the initial molding strength is excellent, but the molding strength can be maintained consistently without being affected by the external environment such as climate and temperature.

In addition, the present invention seeks to secure economical effects by reducing costs and increasing production by recycling and manufacturing the provided coal briquettes generated during processing such as transfer and drying of raw coal.

According to an embodiment of the present invention, it contains 1 to 20 parts by weight of the caking agent with respect to 100 parts by weight of the coal briquette raw material containing pulverized coal,

The caking additive is 50 to 80% by weight of a polyvinyl acetate solution; 10 to 40% by weight of polyhydric alcohol; Provided is a briquette comprising 2 to 20% by weight of surfactant and 1 to 5% by weight of hydrophilic synthetic polymer.

The pulverized coal may have a dust form having an average particle size of 0.3 mm or less.

The coal briquettes may further include coal.

When the pulverized coal and coal are included as raw materials for the coal briquettes, the weight ratio (pulverized coal:coal) of the pulverized coal and coal may be 1:0.3-2.5.

The pulverized coal may be generated in a process of transferring coal from a production site to a consumption site or a CMCP (Coal Moisture Control Process).

The concentration of the polyvinyl acetate solution may be 1 to 50% by weight.

The polyvinyl acetate solution may be obtained by free radical polymerization of a vinyl monomer.

The polyhydric alcohol may be at least one selected from glycerin, ethylene glycol, polyethylene glycol, and propylene glycol.

The surfactant may be at least one of cationic surfactant and nonionic surfactant.

The cationic surfactants include Cocamido propyl betaine, Lauryl betaine, Lauramidopropyl betaine, Sodium lauroamphoacetate and disodium. It may be one or more selected from the group consisting of coco amphodiacetate (Disodium cocoamphodiacetate).

The nonionic surfactant may be at least one selected from the group consisting of Polysorbate 80, Tween 80, Decyl glucoside and C8-14 alkyl polyglucoside.

The hydrophilic synthetic polymers include sodium polyacrylate, ethylene vinyl acetate (EVA), polyoxyethylene oxide, polyvinyl acetate (PVAc), polyvinylpyrrolidone ( Polyvinylpyrrolidone, PVP), Carboxy vinyl polymer 941, Carboxy vinyl polymer 934, Polyvinyl alcohol (PVA) and polyacrylamide (PAM) It may be abnormal.

According to another embodiment of the present invention, preparing a coal briquette raw material comprising at least one of pulverized coal and coal;

Spraying and uniformly mixing the caking agent so that the caking agent is contained in 1 to 20 parts by weight based on 100 parts by weight of the coal briquette raw material; And

Pressure-forming the mixed coal briquette raw material and the caking agent,

The caking additive is 50 to 80% by weight of a polyvinyl acetate solution; 10 to 40% by weight of polyhydric alcohol; It provides a method for producing coal briquettes using pulverized coal containing 2 to 20% by weight of surfactant and 1 to 5% by weight of hydrophilic synthetic polymer.

When the pulverized coal and coal are included as raw materials for the coal briquettes, the weight ratio (pulverized coal:coal) of the pulverized coal and coal may be 1:0.3-2.5.

The concentration of the polyvinyl acetate solution may be 1 to 50% by weight.

The polyvinyl acetate solution may be obtained by free radical polymerization of a vinyl monomer.

The coal briquettes provided in the present invention can be maintained consistently in quality because the molding strength is not affected by changes in the external environment such as climate and temperature using an emulsion polymerization caking agent.

In addition, the coal briquettes provided in the present invention can recycle the pulverized coal generated in the process of transporting and drying coal as a raw material, thereby obtaining an economic effect according to cost reduction, and the pulverized coal is mixed with a caking agent. When the coal is used as a raw material because of the high strength of the coal briquettes, the coal and the pulverized coal are more uniformly and strongly combined by the high permeability of the caking agent, thereby improving the compressive strength of the coal briquettes to a higher level than in the prior art. As a result, high strength coke can be produced.

In addition, the coal briquettes provided in the present invention have improved drop strength compared to the prior art, so as to prevent pulverization by dropping during the process of transferring the coal briquettes to the blast furnace, it is possible not only to obtain an economical effect due to loss of coal briquettes. Also, it can have a great effect in preventing the work environment from deteriorating due to dust generation.

Hereinafter, preferred embodiments of the present invention will be described. However, the embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

The present invention relates to coal briquettes using pulverized coal manufactured to be suitable for coke production and a method of manufacturing the same, and by using an emulsion polymerization caustic agent as the caking agent used in the production of the coal briquettes, the compressive strength and drop strength of the coal briquettes produced are It can be improved to a significantly higher level than in the prior art, and even if the external environment such as climate and temperature changes, the molding strength of the coal briquettes is not affected, so the quality can be maintained at a constant level.

Specifically, according to an embodiment of the present invention, the caking agent contains 1 to 20 parts by weight based on 100 parts by weight of the coal briquettes containing pulverized coal, and the caking agent is 50 to 80% by weight of a polyvinyl acetate solution; 10 to 40% by weight of polyhydric alcohol; Provided is a coal briquette using pulverized coal, characterized in that it contains 2 to 20% by weight of a surfactant and 1 to 5% by weight of a hydrophilic synthetic polymer.

The present invention may include pulverized coal or a mixture thereof as a coal briquette raw material, wherein the pulverized coal is generated in a CMCP (Coal Moisture Control Process) process for the process of transferring coal, which is raw coal, from production to consumption, or for moisture control. As the pulverized coal, a powder having an average particle size of 0.3 mm or less can be used.

The present invention can provide a coal briquette having excellent molding quality of compressive strength and drop strength even when only pulverized coal is used as a coal briquette raw material. However, the present invention may use only pulverized coal as a coal briquette raw material as described above, however, if necessary, a mixture of pulverized coal and coal, which is a raw coal, may also be used. In the present invention, porous coal having voids formed therein By using in combination with the pulverized coal, the pulverized coal is filled between the pores of the coal in the process of mixing the coal and the pulverized coal, so that the compression strength and the drop strength of the final coal briquettes can be further improved.

As described above, in the present invention, when both the pulverized coal and the coal are included as raw materials for the coal briquettes, the mixing ratio is not particularly limited. For example, the pulverized coal and coal briquettes are in a weight ratio of 1:0.3 to 2.5 (pulverized coal:coal). Or, it is preferable to be mixed in a weight ratio of 1:1, 7:3 or 3:7 because it is possible to manufacture coal briquettes having a moisture content of 5 to 10%.

On the other hand, the coal briquettes of the present invention preferably contains 1 to 20 parts by weight of a caking agent relative to 100 parts by weight of the raw coal. When the content of the caking agent is less than 1 part by weight, there is a fear that the caking agent and the pulverized coal are not evenly mixed with each other because the corresponding amount is too small, which may adversely affect the forming of the coal briquettes. In addition, when the content of the caking agent exceeds 20 parts by weight, the effect of improving the strength of the coal briquettes is negligible, and a phenomenon in which a mixture of the caking agent and coal adheres to the equipment occurs, which acts as a obstacle to continuous operation, resulting in emission. May cause environmental problems.

In addition, in the present invention, the caking additive includes 50 to 80% by weight of a polyvinylacetate solution; 10 to 40% by weight of polyhydric alcohol; It is preferred to contain 2 to 20% by weight of surfactant and 1 to 5% by weight of hydrophilic synthetic polymer.

In the present invention, since the polyvinyl acetate solution contained in a large amount in the caking agent has a lipophilic property, it does not absorb moisture from the outside in the summer or in a high humidity environment, even if it penetrates to pulverized coal and finally produces coal briquettes. B. The molding strength of coal briquettes does not change according to changes in the external environment, such as temperature, so that the quality can be kept constant.

In general, the strength improvement of the coal briquettes is to increase the charging density of the raw coal to improve the strength of the coke produced. In addition, the improvement of the drop strength in addition to the compressive strength is a process in which the coal briquettes are transferred to the final blast furnace by a conveyor belt. In order to prevent the differentiation due to physical impact such as drop, in the present invention by using a tackifier containing a polyvinyl acetate solution by providing a coal briquettes that maintain excellent compressive strength and drop strength regardless of changes in the external environment In the end, it is possible not only to prevent the loss of coal briquettes for coke production, but also to improve the deterioration of the working environment due to the generated dust.

In addition, the polyvinyl acetate solution used in the present invention is not particularly limited, and can be appropriately selected and used according to the purpose among those widely commercially available, for example, depending on the use and properties required for the caking agent, various What is obtained by copolymerizing a vinyl monomer can be used, for example, what is obtained by free radical polymerization of an acrylic monomer can be used in solution. Co-polymerized ones can be used.

At this time, the polyvinyl acetate solution is preferably used in a concentration of 1 to 50% by weight. When the concentration of the polyvinyl acetate solution is less than 1% by weight, it may not sufficiently function as a caking agent, and when the concentration exceeds 50% by weight, the viscosity is too high, resulting in poor workability and handling, and a saturated concentration. As it becomes difficult to solution any more, it may act as a factor of lowering productivity, and an increase in manufacturing price may also be a problem.

In addition, the polyvinyl acetate solution in the present invention is preferably included in the content of 50 to 80% by weight in the caking agent. When the content of the polyvinyl acetate solution is less than 50% by weight, the role as a caking agent may not be sufficiently performed, and when the content exceeds 80% by weight, the efficiency of emulsification workability may be deteriorated.

In the present invention, the polyhydric alcohol contained in the caking agent is used as a plasticizer, and the type is not particularly limited, but one or more selected from the group consisting of glycerin, ethylene glycol, polyethylene glycol, and propylene glycol may be used.

In addition, the polyhydric alcohol is preferably a concentration of 80% by weight or more. Although the concentration of the polyhydric alcohol does not affect the adhesive strength of the caking additive containing the polyvinyl acetate solution, the lower the concentration of the polyhydric alcohol, the higher the strength of the coal briquettes combined with the caking additive.

In addition, in the present invention, the polyalcohol may be included in the amount of 10 to 30% by weight in the caking agent. When the content of the polyhydric alcohol is less than 10% by weight, physical properties may be low, which may be a problem in efficiency, and when the content is more than 30% by weight, it may be a problem in economical points due to an increase in the cost of the caking agent. In particular, when using xanthan gum as polyhydric alcohol, the adhesive effective content may be lowered, and the strength of the coal briquettes may be rapidly reduced.

In addition, the surfactant in the present invention can serve to increase the mixing effect of the coal briquette raw material and the caking agent by increasing the penetration force of the coal briquette raw material by reducing the surface tension of water as well as increasing the emulsifying and dispersing power of water and each polymer resin. .

At this time, as the surfactant, a cationic surfactant, a nonionic surfactant, or a mixture thereof may be used, and preferably a cationic surfactant may be used.

In addition, the cationic surfactants include Cocamido propyl betaine, Lauryl betaine, Lauramidopropyl betaine, Sodium lauroamphoacetate And disodium cocoamphodiacetate (Disodium cocoamphodiacetate) may be used one or more selected from the group consisting of, the nonionic surfactant is polysorbate 80 (Polysorbate 80, Tween 80), decyl glucoside (Decyl glucoside) and C8 One or more selected from the group consisting of -14 alkyl polyglucosides can be used.

In addition, in the present invention, the surfactant may be included in 2 to 20% by weight in the caking agent. When the content of the surfactant is less than 2% by weight, the emulsifying and dispersing power is lowered, and the penetrating power of the caking agent to the coal briquettes may be lowered, and when the content exceeds 20% by weight, the cost of the caking agent is economical. Can be a problem in

In addition, the surfactant used in the present invention is preferably used in a concentration of 1 to 10% by weight. When the concentration of the surfactant is less than 1% by weight, the role of the surfactant may not be sufficiently performed and separation of the lipophilic polyvinyl acetate and the hydrophilic synthetic polymer may occur, and when the concentration exceeds 10% by weight, the binder Cost increases can be a problem for the economy.

In addition, in the present invention, as the hydrophilic synthetic polymer included in the caking agent, it is capable of forming a cohesive force and an adhesive property to form a contact angle of a droplet on a contact surface, but the type is not particularly limited, for example. , Sodium polyacrylate, ethylene vinyl acetate (EVA), polyoxyethylene oxide, polyvinylpyrrolidone (PVP), carboxyvinyl polymer 941 , Carboxy vinyl polymer 934, one or more selected from the group consisting of polyvinyl alcohol (PVA) and polyacrylamide (PAM) may be used.

Even if polyvinyl alcohol is used as the hydrophilic synthetic polymer in the present invention, since it is used in a very small amount relative to the total weight of the coal briquettes, the quality such as the strength of the coal briquettes may not be changed and can be kept constant according to environmental changes such as climate or temperature. have.

However, the polyvinyl alcohol may be recycled from the waste polarizing film generated as a waste in the manufacturing process of the polarizing plate, the release film used in molding the marble, packaging material or hygiene material to be recovered as polyvinyl alcohol waste.

In addition, in the present invention, the hydrophilic synthetic polymer may be included in the content of 1 to 5% by weight in the caking agent, more preferably 1 to 2% by weight. When the content of the hydrophilic synthetic polymer is less than 1% by weight, adhesiveness may be deteriorated, and when the content exceeds 5% by weight, viscosity increases and mixing with the coal briquette raw material becomes difficult, resulting in deterioration in compressive strength, etc. .

The present invention can be variously adjusted the molecular weight and saponification degree of the polyvinyl acetate solution contained in the caking agent, the type and content of the plasticizer (polyhydric alcohol), and the type of surfactant, depending on the desired compressive strength and molding rate of the coal briquettes. If necessary, an alkali catalyst and a pH adjusting agent may be additionally included in the coal briquettes, if necessary.

According to another embodiment of the present invention, it relates to a method for manufacturing coal briquettes using pulverized coal provided in the present invention, specifically, preparing a coal briquette raw material containing pulverized coal, and a caking agent for 100 parts by weight of the coal briquette raw material Including 1 to 20 parts by weight, the step of uniformly mixing by introducing the caking agent and the step of pressure-molding the mixed coal briquette raw material and caking agent, the caking agent is 50 to 80 wt% of a polyvinyl acetate solution; 10 to 40% by weight of polyhydric alcohol; Characterized in that it contains 2 to 20% by weight of surfactant and 1 to 5% by weight of hydrophilic synthetic polymer.

Specifically, the present invention is prepared by preparing a raw coal briquettes containing pulverized coal, and injecting a caking agent to the prepared coal briquettes by a method such as spraying, and then uniformly mixing the caking agent and coal briquette raw materials. The raw materials can be agglomerated from a powder form to a lump form through the adhesive force of a caking agent.

Meanwhile, in the present invention, when the caking agent and the coal briquette material are uniformly mixed, the blended coal briquette material and the caking agent can be press-molded at room temperature, and the molding conditions are not particularly limited, and are commonly used in the art. As a means, for example, it may be performed using a kind of double roll type briquette composed of two pressing rollers.

As described above, the present invention does not impart strength to the coal briquettes through drying unlike the conventional caking agent, and the caustic agent having a low viscosity is uniformly dispersed in the coal briquettes, thereby preventing agglomeration of the mixture with the pulverized coal and coal and The mixing efficiency of the raw material and the caking agent is improved, and thus coal briquettes having improved physical properties, particularly excellent and uniform drop strength and initial strength, can be produced.

In addition, in the present invention, by using a caking agent containing a large amount of polyvinyl acetate solution, due to the lipophilic nature of the polyvinyl acetate solution, the seonghyeongtan finally does not absorb moisture from the outside in the summer or high humidity environment, The molding strength of coal briquettes can be maintained constant without changing depending on the external environment such as climate or temperature.

On the other hand, in the manufacturing method of the present invention, the type and content of the raw material and caking agent for coal are the same as those described in the coal briquettes provided in the present invention.

However, the present invention, in order to obtain the desired compression strength and molding rate in the coal briquettes to be produced, the molecular weight and saponification degree of the polyvinyl acetate solution contained in the caking agent, the type and content of the plasticizer (polyhydric alcohol), and surfactant It can be variously adjusted the type of, and if necessary, the coal briquettes may further include an alkali catalyst and a pH adjusting agent.

Example

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are only examples for helping the understanding of the present invention, and the scope of the present invention is not limited thereto.

[Example 1]

Coal blend with 5% by weight of water content obtained by mixing 1% by weight of fine coal with an average particle size of 0.3mm or less, and 8% by weight of raw coal with an average particle size of 3mm or less in a weight ratio of 1:1. In, 5% by weight of a polyvinyl acetate solution of 80% by weight, 10% by weight of glycerin, 2% by weight of polyvinyl alcohol and 8% by weight of a surfactant, 5 parts by weight based on 100 parts by weight of the coal blend After spraying in an amount and mixing uniformly, it was press-molded in 90 g units to prepare coal briquettes (samples).

[Example 2]

Coal briquettes were prepared in the same manner as in Example 1, and a coal blend having a moisture content of 7% by weight was used as a coal briquette raw material.

[Example 3]

Coal briquettes were prepared in the same manner as in Example 1, and a coal blend having a moisture content of 9% by weight was used as a coal briquette raw material.

[Example 4]

Coal briquettes were prepared in the same manner as in Example 1, and the caking agent was sprayed in an amount of 7 parts by weight based on 100 parts by weight of the coal formulation.

[Example 5]

Coal briquettes were prepared in the same manner as in Example 4, and a coal blend having a moisture content of 7% by weight was used as a coal briquette raw material.

[Example 6]

Coal briquettes were prepared in the same manner as in Example 4, and a coal blend having a moisture content of 9% by weight was used as a coal briquette raw material.

[Example 7]

Coal briquettes were prepared in the same manner as in Example 4, and a coal blend having a moisture content of 15% by weight was used as a coal briquette raw material.

[Comparative Example 1]

Coal blend with 5% by weight of water content obtained by mixing 1% by weight of fine coal with an average particle size of 0.3mm or less, and 8% by weight of raw coal with an average particle size of 3mm or less in a weight ratio of 1:1. With respect to 100 parts by weight, a binder containing 90% by weight of a 5% by weight polyvinyl alcohol solution and 10% by weight of glycerin is uniformly mixed by spraying in an amount of 5 parts by weight, and then press-molded in 90 g increments to form coals. (Sample) was prepared.

[Comparative Example 2]

Coal briquettes were prepared in the same manner as in Comparative Example 1, and a coal blend having a moisture content of 7% by weight was used as a coal briquette raw material.

[Comparative Example 3]

Coal briquettes were prepared in the same manner as in Comparative Example 1, and a coal blend having a moisture content of 9% by weight was used as a coal briquette raw material.

[Comparative Example 4]

Coal briquettes were prepared in the same manner as in Comparative Example 1, and the caking agent was uniformly mixed by spraying in an amount of 7 parts by weight with respect to 100 parts by weight of the coal formulation.

[Comparative Example 5]

Coal briquettes were prepared in the same manner as in Comparative Example 4, and a coal blend having a moisture content of 7% by weight was used as a coal briquette raw material.

[Comparative Example 6]

Coal briquettes were prepared in the same manner as in Comparative Example 4, and a coal blend having a moisture content of 9% by weight was used as a coal briquette raw material.

[Comparative Example 7]

Coal briquettes were manufactured in the same manner as in Comparative Example 4, and a coal blend having a moisture content of 15% by weight was used as a coal briquette raw material.

[Experimental Example 1]

Each of the coal briquettes prepared in Examples 1 to 6 and Comparative Examples 1 to 6 was selected 10 each to test the compressive strength and differentiation rate 5 times, and the test results (compressive strengths in turn showed the average value of the tested results). ) Is shown in Table 1 below.

However, the rate of differentiation is for measuring the drop strength of coal briquettes. In this experiment, it was shown on the basis of the fragment size of coal briquettes that are differentiated by physical impact caused by dropping 90 g of coal briquettes at a height of 5 to 6 m from the ground. , As shown in Equation 1 below, the total weight of the differentiated pieces having a size of 3 mm or less with respect to the weight of the initial coal briquettes is expressed as a percentage.

[Equation 1]

Eruption rate (%) = (total weight of the fragmented pieces of 3 mm or less / weight of the first coal briquettes) X100

division Water content of coal blend (% by weight) Caking agent content
(Parts by weight) Compressive strength (kgf/cm ² ) Differentiation rate (%) Example 1 5 5 28.231 9.1 Example 2 7 5 34.145 5.3 Example 3 9 5 38.428 3.7 Example 4 5 7 32.718 6.8 Example 5 7 7 39.682 3.1 Example 6 9 7 43.197 1.6 Example 7 15 7 42.581 2.2 Comparative Example 1 5 5 12.452 17.4 Comparative Example 2 7 5 17.814 13.8 Comparative Example 3 9 5 19.453 10.8 Comparative Example 4 5 7 15.152 18.5 Comparative Example 5 7 7 20.124 16.7 Comparative Example 6 9 7 24.564 14.2 Comparative Example 7 15 7 13.872 19.8

As shown in Table 1, the coal briquettes of Examples 1 to 7 belonging to the scope of the present invention have a compressive strength of about 35 kgf/cm ² and a differentiation rate of about 5%, as in the prior art, polyvinyl alcohol. Compared to the briquettes of Comparative Examples 1 to 7 prepared using a caking agent mainly containing a solution, it can be seen that the compressive strength and drop strength of the briquettes produced have significantly improved levels.

In addition, when comparing Examples 4 to 7 and Comparative Examples 4 to 7, when the moisture content of the coal blend is in the range of 5 to 9% by weight, as the moisture content increases, the compressive strength improves and the eruption rate decreases, that is, It can be seen that the drop strength is improved.

However, when the moisture content of the coal blend exceeds 15% by weight beyond the above range, it belongs to the scope of the present invention, and Example 7 using a polyvinyl acetate solution as a caking additive has slightly reduced compressive strength and differentiation rate. Although it shows a slightly increasing trend, it can still be seen that both the compressive strength and the drop strength have excellent levels, Comparative Example 7 using a polyvinyl alcohol solution as a caking additive significantly decreases the compressive strength compared to Comparative Example 6, It can be seen that the differentiation rate is significantly increased.

Therefore, when the moisture content of the coal blend is significantly increased due to factors such as the external environment, when the polyvinyl alcohol solution is conventionally used as a caking agent, it can be seen that the compressive strength and drop strength are significantly reduced, but the present invention As can be seen, when using a polyvinyl acetate solution as a caking agent, it is possible to maintain a superior level of compressive strength and drop strength.

Although the embodiments of the present invention have been described in detail above, the scope of rights of the present invention is not limited thereto, and it is possible that various modifications and variations are possible without departing from the technical spirit of the present invention as set forth in the claims. It will be apparent to those of ordinary skill in the field.

Claims (16)

1 to 20 parts by weight of the caking agent with respect to 100 parts by weight of the coal briquette raw material containing pulverized coal,
The caking additive is 50 to 80% by weight of a polyvinyl acetate solution; 10 to 40% by weight of polyhydric alcohol; Coal briquettes containing 2 to 20% by weight of surfactant and 1 to 5% by weight of hydrophilic synthetic polymer. The pulverized coal according to claim 1, wherein the pulverized coal has a dust shape having an average particle size of 0.3 mm or less. The coal briquettes of claim 1, wherein the coal briquettes further comprise coal. The coal briquettes of claim 3, wherein when the pulverized coal raw material includes pulverized coal and coal, the weight ratio of the pulverized coal and coal (fine coal: coal) is 1:0.3-2.5. The coal briquettes of claim 3, wherein the pulverized coal is generated in a process of transferring coal from a production site to a consumption site or a CMCP (Coal Moisture Control Process). The coal briquettes of claim 1, wherein the concentration of the polyvinyl acetate solution is 1 to 50% by weight. The coal briquette of claim 1, wherein the polyvinyl acetate solution is obtained by free radical polymerization of a vinyl monomer. The coal briquette of claim 1, wherein the polyhydric alcohol is at least one selected from glycerin, ethylene glycol, polyethylene glycol, and propylene glycol. The coal briquette of claim 1, wherein the surfactant is at least one of a cationic surfactant and a nonionic surfactant. The method of claim 9, wherein the cationic surfactant is cocamido propyl betaine, lauryl betaine, lauramidopropyl betaine, sodium lauroamphoacetate ( Sodium lauroamphoacetate) and one or more coal briquettes selected from the group consisting of disodium cocoamphodiacetate. The coal briquette of claim 9, wherein the nonionic surfactant is at least one selected from the group consisting of Polysorbate 80, Tween 80, Decyl glucoside and C8-14 alkyl polyglucoside. . The method of claim 1, wherein the hydrophilic synthetic polymer is sodium polyacrylate (Sodium polyacrylate), ethylene vinyl acetate (Ethylene vinyl acetate, EVA), polyoxyethylene oxide (Polyoxyethylene oxide), polyvinyl acetate (Polyvinyl acetate, PVAc), Polyvinylpyrrolidone (PVP), Carboxy vinyl polymer 941, Carboxy vinyl polymer 934, Polyvinyl alcohol (PVA) and Polyacrylamide (PAM) One or more coal briquettes selected from the group consisting of. Preparing a coal briquette raw material including pulverized coal and coal;
Spraying and uniformly mixing the caking agent so that the caking agent is contained in 1 to 20 parts by weight based on 100 parts by weight of the raw coal; And
Pressure-forming the mixed coal briquette raw material and the caking agent,
The caking additive is 50 to 80% by weight of a polyvinyl acetate solution; 10 to 40% by weight of polyhydric alcohol; Method for producing coal briquettes containing 2 to 20% by weight of surfactant and 1 to 5% by weight of hydrophilic synthetic polymer. 14. The method of claim 13, wherein the weight ratio (pulverized coal:coal) of pulverized coal and coal among the raw coals is 1:0.3-2.5. The method of claim 13, wherein the concentration of the polyvinyl acetate solution is 1 to 50% by weight. The method of claim 13, wherein the polyvinyl acetate solution is obtained by free radical polymerization of a vinyl monomer.