WO2016010310A1 - Binder for coal briquette - Google Patents

Abstract

Disclosed is a binder for a coal briquette. The disclosed binder for a coal briquette comprises at least one cellulose ether-based compound selected from the group consisting of alkyl cellulose, hydroxyalkyl cellulose, and hydroxyalkyl alkyl cellulose, which have viscosity of 1,000-80,000 cps. The binder for a coal briquette may not need an additional strength enhancer, and can produce a high-strength coal briquette, capable of simplifying the manufacturing process of the coal briquette.

Description

Binder for Coal Briquettes

A binder for coal briquettes is disclosed. In more detail, the binder for coal briquettes containing the cellulose ether type compound which has a specific viscosity range is disclosed.

The steelmaking process is an iron making process for manufacturing molten iron by charging iron ore and coal into a blast furnace, and a steelmaking process for manufacturing molten steel of high purity by removing impurities contained in the molten iron. making process, casting process for manufacturing semi-finished products such as solid slab from liquid molten steel, and rolling process for manufacturing final steel products by processing semi-finished products such as slab. do.

Fine ore reduction process (FINEX) and smelting reduction process (COREX) do not process bituminous coal in the form of cokes.

Bituminous coal having a particle size of more than 8 mm can be used immediately without special processing, but bituminous coal having a particle size of 8 mm or less is limited to use due to dust generation in operation. Therefore, bituminous coal having a particle size of 8 mm or less is used after being processed into coal briquettes of a certain particle size.

When processing bituminous coal of small particle size as described above into coal briquettes, molasses is conventionally mainly used as a binder. However, when molasses is used as a binder, various disadvantages occur.

First, when molasses is used as a binder, since the strength of the finally produced coal briquettes is weak, a strength enhancer such as quicklime, bentonite or a mixture thereof must be additionally used to strengthen the coal briquettes.

Next, odor derived from molasses is generated during the operation.

In addition, molasses has a sticky liquid form, and the viscosity increases as the temperature decreases, so that the molasses is attached to storage tanks, pipes, and nozzles during storage, transportation, and spraying. Therefore, there is a need for facilities (eg, high pressure pumps and heating devices) to prevent and prevent these problems. Therefore, when molasses is used as a binder, there is a disadvantage that the manufacturing process of coal briquettes is complicated.

In addition, since molasses is derived from a natural material, there is a disadvantage that it is difficult to maintain a constant quality of coal briquettes because the viscosity is not constant according to a source, supplier, and supply time.

In addition, since molasses is a liquid phase and has a low density to be used in large quantities, a large capacity storage facility is required, and there is a disadvantage of increasing the amount of transportation and the transportation cost accordingly.

In addition, molasses has a drawback of unstable supply and cost.

One embodiment of the present invention provides a binder for coal briquettes including at least one cellulose ether-based compound selected from the group consisting of alkyl cellulose, hydroxyalkyl cellulose and hydroxyalkyl alkyl cellulose having a specific viscosity range.

One aspect of the invention,

Provided is a binder for coal briquettes including at least one cellulose ether-based compound selected from the group consisting of alkyl cellulose, hydroxyalkyl cellulose and hydroxyalkyl alkyl cellulose having a viscosity of 1,000 to 80,000 cps.

The binder for coal briquettes may be for binding coal dust to manufacture coal briquettes.

The pulverized coal may be bituminous coal having a particle size of 8 mm or less, especially 4 mm or less.

The cellulose ether-based compound is selected from the group consisting of methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) and hydroxyethyl methyl cellulose (HEMC) It may comprise at least one substance.

The methyl cellulose (MC) has a methyl group substitution degree of 18 to 32wt%, the hydroxyethyl cellulose (HEC) has a hydroxyethyl group substitution degree of 20 to 80wt%, the hydroxypropyl cellulose (HPC) is 20 It has a hydroxypropyl group substitution degree of ~ 80wt%, the hydroxypropyl methyl cellulose (HPMC) has a methyl group substitution degree of 18 ~ 32wt% and a hydroxypropyl group substitution degree of 2 ~ 14wt%, the hydroxyethyl Methyl cellulose (HEMC) may have a degree of methyl group substitution of 18 to 32 wt% and a degree of hydroxyethyl group substitution of 2 to 14 wt%.

The cellulose ether-based compound may be used in an amount of 0.01 to 15.0 parts by weight based on 100 parts by weight of the pulverized coal.

The binder for coal briquettes may further include more than 0 to 10,000 parts by weight of an additional binder based on 100 parts by weight of the cellulose ether-based compound.

The additional binder is molasses, corn starch, wheat starch, potato starch, polyethylene glycol (PEG), polyvinyl alcohol (PVA), polyacrylamide (PAM), sucrose, liquid glucose, acacia gum, tragacanth gum ), Gelatin, alginic acid, polymethacrylate, polyvinylpyrrolidone (PVP), sodium polyacrylate, polyvinyl methyl ether (PLM), alginic acid, asphalt, bitumen, BITUMEN, casein, epoxy resin, pitch (PITCH), polyamide, polyurethane and polyvinyl acetal at least one material selected from the group consisting of.

The binder for coal briquettes according to an embodiment of the present invention includes a cellulose ether-based compound having a specific viscosity range, thereby reducing the total amount of binder used (up to 1/10 the amount of molasses when 100% molasses is used), and further strength. It may not require a reinforcing agent, can simplify the coal briquette manufacturing process, and can produce a high-strength coal briquette that can maintain a stable supply and price compared to molasses.

In addition, since the binder for coal briquettes including the cellulose ether-based compound is colorless and odorless, odor does not occur, and thus the working environment may be improved.

Hereinafter, a binder for coal briquettes according to an embodiment of the present invention will be described in detail. The binder for coal briquettes according to an embodiment of the present invention is at least one cellulose ether compound selected from the group consisting of alkyl cellulose, hydroxyalkyl cellulose and hydroxyalkyl alkyl cellulose having a viscosity of 1,000 to 80,000 cps (centipoises) or mPa s. It includes.

In the present specification, "viscosity of cellulose ether-based compound" is a viscosity measured using DV-II + Pro (spindle HA) of Brookfield Co., Ltd. of aqueous solution of cellulose ether-based compound having a concentration of 2% by weight at 20 ± 0.1 ℃ It means viscosity.

When the viscosity of the cellulose ether-based compound is less than 1,000 cps, the viscosity of the solution (eg, an aqueous solution) containing the cellulose ether-based compound is so low that the binding force of the cellulose ether-based compound to the pulverized coal falls, and 80,000 cps is used. When it exceeds, the molecular weight of the said cellulose ether type compound will be high and water solubility will fall and binding force with respect to the said pulverized coal is not fully exhibited.

The viscosity of the cellulose ether-based compound is, for example, 2,000-70,000cps, for example 6,000-60,000cps, for example 7,000-50,000cps, for example 8,000-40,000cps, for example 9,000-30,000cps, for example For example, it may be 10,000-20,000cps.

The binder for coal briquettes may be for binding coal dust to manufacture coal briquettes. As used herein, "pulverized coal" means coal having a particle size of 8 mm or less.

The pulverized coal may be bituminous coal. In the present specification, "soft coal" means a relatively soft coal containing a tar-like substance called bitumen.

The pulverized coal may have a particle size of 4 mm or less. When the particle size of the pulverized coal is 4 mm or less, the pulverized coal may be prevented from being destroyed by the pressure applied thereto during the manufacturing process of the coal briquettes. Accordingly, if the particle size of the pulverized coal is 4 mm or less, the finally produced coal briquettes may maintain high strength.

The cellulose ether-based compound serves to bind the particles of the pulverized coal to each other.

The cellulose ether-based compound not only dissolves well in water, but does not precipitate on the inner surface of the nozzle when sprayed through the nozzle in an aqueous state, and thus does not block the nozzle hole. In addition, the cellulose ether-based compound alone or mixed with pulverized coal is stored and transported in the form of a solid powder, and mixed with water in the final use stage, thereby miniaturizing and simplifying the storage facility and simplifying the transportation facility. . In addition, since the same binding effect can be obtained with the said cellulose ether type compound in less amount than molasses, material cost can also be reduced. In addition, the cellulose ether-based compound has the advantage of obtaining coal briquettes having excellent strength without using a strength enhancer.

The cellulose ether-based compound may not include carboxymethyl cellulose (CMC). If the cellulose ether-based compound includes carboxymethyl cellulose (CMC), the coal briquettes manufactured using the coal briquette composition including the coal briquette binder may have a reduced strength.

The cellulose ether-based compound is selected from the group consisting of methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) and hydroxyethyl methyl cellulose (HEMC) It may comprise at least one substance.

The methyl cellulose (MC) has a methyl group substitution degree of 18 to 32wt%, the hydroxyethyl cellulose (HEC) has a hydroxyethyl group substitution degree of 20 to 80wt%, the hydroxypropyl cellulose (HPC) is 20 It has a hydroxypropyl group substitution degree of ~ 80wt%, the hydroxypropyl methyl cellulose (HPMC) has a methyl group substitution degree of 18 ~ 32wt% and a hydroxypropyl group substitution degree of 2 ~ 14wt%, the hydroxyethyl Methyl cellulose (HEMC) may have a degree of methyl group substitution of 18 to 32 wt% and a degree of hydroxyethyl group substitution of 2 to 14 wt%.

The cellulose ether-based compound may be used in an amount of 0.01 to 15.0 parts by weight based on 100 parts by weight of the pulverized coal. When the amount of the cellulose ether-based compound used is within the above range, high strength coal briquettes can be obtained even with a small amount of molasses.

The binder for coal briquettes may further include more than 0 to 10,000 parts by weight of an additional binder based on 100 parts by weight of the cellulose ether-based compound. When the content of the additional binder is within the above range, it is possible to reduce the amount of the cellulose ether-based compound to reduce the manufacturing cost of the coal briquette binder, and to increase the drying speed of the composition for forming coal briquettes including the coal briquette binder. Coal briquettes can be obtained, the dust generation is low and the strength is improved.

The additional binder is molasses, corn starch, wheat starch, potato starch, polyethylene glycol (PEG), polyvinyl alcohol (PVA), polyacrylamide (PAM), sucrose, liquid glucose, acacia gum, tragacanth gum ), Gelatin, alginic acid, polymethacrylate, polyvinylpyrrolidone (PVP), sodium polyacrylate, polyvinyl methyl ether (PLM), alginic acid, asphalt, bitumen, BITUMEN, casein, epoxy resin, pitch (PITCH), polyamide, polyurethane and polyvinyl acetal at least one material selected from the group consisting of.

The binder for coal briquettes may provide a binder for coal briquettes having improved strength, even if the binder for coal briquettes does not include a strength enhancer such as quicklime, bentonite, or other materials that can enhance the strength of coal briquettes.

Another embodiment of the present invention provides a coal briquettes manufactured using the binder for coal briquettes.

When the coal briquettes are manufactured using the binder for coal briquettes, more than 0 to 15.0 parts by weight of water may be used based on 100 parts by weight of the pulverized coal. When the content of the water is within the above range, it is easy to handle and obtain a composition for forming coal briquettes having a uniform composition, it is possible to prevent the phenomenon that some components in the composition for forming coal briquettes on the surface of the molding machine in the coal briquette forming process. have.

The coal briquettes manufactured using the coal briquette binder may not be used in a coke manufacturing process, but may be used as a heat source of a Finex process and a Corex process. Therefore, the coal briquettes prepared above have advantages of high thermal efficiency and fast drying speed.

The method for producing coal briquettes from the binder for coal briquettes is as follows. That is, a coal briquette forming composition is prepared by mixing the coal briquette binder, pulverized coal, and water, and the coal briquette forming composition is introduced into a mold and pressurized to a predetermined pressure to produce coal briquettes.

The binder for coal briquettes may provide a binder for coal briquettes having improved strength even if the binder for coal briquettes is not included.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example

Examples 1-9 and Comparative Examples 1-4

(Preparation of the composition for forming coal briquettes including the binder for coal briquettes)

Pulverized coal (SK Networks, particle size: 0.1 ~ 5mm) and optionally hydroxypropylmethylcellulose, carboxymethylcellulose (CMC) (ASHILAND, AQUALON ^TM , Viscosity: 6,000cps), Molasses (KASH Industrial Environment, Inc., Solids: 77.2 wt%, total equivalent weight: 49.3wt%), quicklime (Chungmu Chemical Co., Ltd., CaO content: 70wt% or more, powder level: 170 mesh (89㎛) sieve 95wt%) mixed in the composition and content shown in Table 1 below To obtain a first composition. Thereafter, distilled water was added to the first composition to obtain a composition for forming coal briquettes. The contents of the components used in the above Examples and Comparative Examples are shown in Table 1 below.

(Manufacture of coal briquettes)

The above-mentioned composition for forming coal briquettes was press-molded with a load of 70 kN using a Briquette machine (Jeilsan Co., Ltd., JCB250T) to prepare 50 coal briquettes, and 30 pieces were selected, except for 20 coal briquettes manufactured at first and later. . The manufactured coal briquettes weighed 5 to 10 g per piece.

Table 1

	Compounding ratio (part by weight)
	Pulverized coal	molasses	Distilled water	quicklime	HPMC					CMC
					One	2	3	4	5
Example 1	100	0	10	0	One	0	0	0	0	0
Example 2	100	0	10	0	3	0	0	0	0	0
Example 3	100	0	10	0	5	0	0	0	0	0
Example 4	100	0	10	0	7	0	0	0	0	0
Example 5	100	2	8	0	5	0	0	0	0	0
Example 6	100	2	8	0	3	0	0	0	0	0
Example 7	100	2	8	0	2	0	0	0	0	0
Example 8	100	0	10	0	0	One	0	0	0	0
Example 9	100	0	10	0	0	0	One	0	0	0
Comparative Example 1	100	0	10	0	0	0	0	One	0	0
Comparative Example 2	100	0	10	0	0	0	0	0	One	0
Comparative Example 3	100	0	10	0	0	0	0	0	0	One
Comparative Example 4	100	8	One	3	0	0	0	0	0	0

HPMC1: Samsung Fine Chemicals, Mecellose ^® PMC (PMC-60U), Viscosity: 60,000 cps, Methyl substitution degree: 23.2 wt%, Hydroxypropyl group substitution degree: 8.8 wt%

HPMC2: Samsung Fine Chemicals, Mecellose ^® PMC (PMB-40H), Viscosity: 4,000 cps, Methyl substitution degree: 28.6 wt%, Hydroxypropyl group substitution degree: 6.1 wt%

HPMC3: Samsung Fine Chemicals Co., Ltd., HPMC, Viscosity: 80,000cps, Methyl substitution degree: 22.8wt%, hydroxypropyl substitution degree: 9.1wt%

HPMC4: Samsung Fine Chemicals Co., Ltd., HPMC, Viscosity: 500cps, Methyl substitution degree: 26.4wt%, Hydroxypropyl group substitution degree: 8.2wt%

HPMC5: Samsung Fine Chemicals Co., Ltd., HPMC, Viscosity: 85,000cps, Methyl substitution degree: 22.6wt%, Hydroxypropyl group substitution degree: 9.2wt%

CMC: ASHILAND, AQUALON ^TM , Viscosity: 6,000 cps

Evaluation example

Evaluation example 1

The impact strength and the compressive strength of the coal briquettes manufactured in Examples 1 to 9 and Comparative Examples 1 to 4 were evaluated by the following method, and the results are shown in Table 2 below.

(Impact strength assessment)

A sand filled cuboid tray (total weight: 0.5 kg) was dropped from the 10 coal briquettes upwards toward the coal briquettes at a height of 50 cm. This drop test was repeated two more times, once for each of the remaining 20 coal briquettes. Thereafter, the total weight of particles having a size of 10 mm or more among the remaining coal briquettes was expressed as a percentage of the weight of the coal briquettes before falling, and the value thereof was evaluated as an impact strength. In this case, the larger the value obtained, the greater the impact strength. The impact strength is a criterion for determining the rate at which the coal briquettes are dropped several times and lost when transported by the conveyor belt.

(Compressive strength evaluation)

The maximum strength when the coal briquettes were compressed at a speed of 5 mm / min in a universal testing machine (Xinjiang Precision Industries, AD-All-round Material Testing Machine-kN) was measured and recorded as a compressive strength. The compressive strength is a criterion for determining the rate at which the coal briquettes are damaged by their own load when the coal briquettes are stored in the storage tank.

TABLE 2

	Example									Comparative example
	One	2	3	4	5	6	7	8	9	One	2	3	4
Impact strength (%)	83	85	88	93	95	90	85	84	85	73	74	70	78
Compressive strength (MPa)	9.9	10.5	11.2	13.1	15.3	12.3	10.8	9.8	10.1	8.9	9.1	7.5	9.3

Referring to Table 2, each of the coal briquettes prepared in Examples 1 to 9 was found to have a higher impact strength and compressive strength than the coal briquettes prepared in Comparative Examples 1 to 4.

Although the present invention has been described with reference to the examples, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (6)

1. Binder for coal briquettes which binds fine pulverized coal to produce coal briquettes and includes at least one cellulose ether-based compound selected from the group consisting of alkyl cellulose, hydroxyalkyl cellulose and hydroxyalkyl alkyl cellulose having a viscosity of 1,000 to 80,000 cps. .
2. The method of claim 1,

   The cellulose ether-based compound is selected from the group consisting of methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) and hydroxyethyl methyl cellulose (HEMC) A binder for coal briquettes containing at least one material.
3. The method of claim 2,

   The methyl cellulose (MC) has a methyl group substitution degree of 18 to 32wt%, the hydroxyethyl cellulose (HEC) has a hydroxyethyl group substitution degree of 20 to 80wt%, the hydroxypropyl cellulose (HPC) is 20 It has a hydroxypropyl group substitution degree of ~ 80wt%, the hydroxypropyl methyl cellulose (HPMC) has a methyl group substitution degree of 18 ~ 32wt% and a hydroxypropyl group substitution degree of 2 ~ 14wt%, the hydroxyethyl Methyl cellulose (HEMC) is a binder for coal briquettes having a methyl group substitution degree of 18 to 32 wt% and a hydroxyethyl group substitution degree of 2 to 14 wt%.
4. The method of claim 1,

   The cellulose ether-based compound is a binder for coal briquettes used in an amount of 0.01 to 15.0 parts by weight based on 100 parts by weight of the pulverized coal.
5. The method of claim 1,

   The binder for coal briquettes further comprising more than 0 to 10,000 parts by weight of the additional binder based on 100 parts by weight of the cellulose ether compound.
6. The method of claim 5,

   The additional binder is molasses, corn starch, wheat starch, potato starch, polyethylene glycol (PEG), polyvinyl alcohol (PVA), polyacrylamide (PAM), sucrose, liquid glucose, acacia gum, tragacanth gum ), Gelatin, alginic acid, polymethacrylate, polyvinylpyrrolidone (PVP), sodium polyacrylate, polyvinyl methyl ether (PLM), alginic acid, asphalt, bitumen, BITUMEN, casein, epoxy resin, pitch A binder for coal briquettes comprising at least one material selected from the group consisting of (PITCH), polyamide, polyurethane, and polyvinyl acetal.