KR20160010316A - 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 a manufacturing process of the coal briquette.

Description

Binder for coal briquette}

A binder for a molded charcoal is disclosed. More specifically, the present invention discloses a binder for a molding coal comprising a cellulose ether compound having a specific viscosity range.

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

Unlike the conventional steelmaking process, the new iron ore fine-ore reduction process (FINEX) and the smelting reduction process (COREX) do not process bituminous coal into cokes, but are used as they are in the melting furnace.

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

When bituminous coal having a small particle size as described above is processed into a shaped coal, molasses is used mainly as a binder in the past. However, when molasses is used as a binder, various drawbacks occur as follows.

First, when molasses is used as a binder, the strength of the finally formed briquettes is weak. Therefore, a strength enhancer such as quicklime, bentonite, or a mixture thereof should be additionally used to enhance the strength of the briquette.

Next, a malodor originating from molasses occurs during the operation.

Further, the molasses is in the form of a sticky liquid, and the viscosity of the molasses becomes higher as the temperature is lowered. Therefore, there is a problem that the molasses is adhered to the storage tank, piping and nozzles during storage, transportation and spraying. Therefore, facilities (for example, a high-pressure pump and a heating device) for preventing and preventing such problems are required. Therefore, when molasses is used as a binder, the manufacturing process of the briquettes becomes complicated.

Since the molasses is derived from a natural substance, viscosity is not constant depending on the source, supplier, and timing of supply, so that it is difficult to keep the quality of the molded coal constant.

In addition, since molasses is a liquid and has a low density, it needs to be used in a large amount, so that a large-capacity storage facility is required, and there is a disadvantage that the transportation amount and the transportation cost are increased.

Molasses also has disadvantages such as unstable supply and demand and unit price.

One embodiment of the present invention provides a binder for a briquette comprising at least one cellulose ether compound selected from the group consisting of alkylcelluloses, hydroxyalkylcelluloses, and hydroxyalkylalkylcelluloses having a specific viscosity range.

According to an aspect of the present invention,

There is provided a binder for a briquette comprising at least one cellulose ether compound selected from the group consisting of alkylcellulose, hydroxyalkylcellulose, and hydroxyalkylalkylcellulose having a viscosity of 1,000 to 80,000 cps.

The binder for the briquette may be one for producing briquettes by binding pulverized coal.

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

The cellulose ether compound is selected from the group consisting of methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropylmethyl cellulose (HPMC) and hydroxyethyl methyl cellulose (HEMC) At least one kind of substance.

Wherein the hydroxyethyl cellulose (HEC) has a hydroxyethyl substitution degree of 20 to 80 wt%, the hydroxypropyl cellulose (HPC) has a degree of substitution of 20 to 80 wt%, and the hydroxypropyl cellulose Wherein the hydroxypropylmethylcellulose (HPMC) has a degree of methyl group substitution of 18 to 32 wt% and a degree of hydroxypropyl group substitution of 2 to 14 wt%, and the hydroxyethyl Methylcellulose (HEMC) may have a degree of methyl group substitution of 18 to 32 wt% and a degree of substitution of hydroxyethyl group of 2 to 14 wt%.

The cellulose ether 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 the briquette may further include 0 to 10,000 parts by weight of an additional binder with respect to 100 parts by weight of the cellulose ether compound.

The additional binder is selected from the group consisting of 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, CASEIN, epoxy resin, (PITCH), polyamide, polyurethane, and polyvinyl acetal.

The binder for a briquette according to one embodiment of the present invention includes a cellulose ether compound having a specific viscosity range so that the total amount of binder used can be reduced (up to one tenth of molasses used when 100% molasses is used) A reinforcing agent is not required, the molding process can be simplified, and a high-strength molded charcoal can be produced which can maintain a stable supply / demand and price against molasses.

Further, since the binder for a molding coal containing the cellulose ether compound is colorless and odorless, odor is not generated and the working environment can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. The binder for a briquette according to an embodiment of the present invention may include at least one cellulose ether compound selected from the group consisting of alkylcellulose, hydroxyalkylcellulose, and hydroxyalkylalkylcellulose having a viscosity of 1,000 to 80,000 cps (centipoises) or mPa ?. .

In the present specification, the " viscosity of the cellulose ether compound " is the viscosity measured using Brookfield's DV-II + Pro (spindle HA) and the viscosity of the aqueous solution of the cellulose ether compound having a concentration of 2% It means viscosity.

If the viscosity of the cellulose ether compound is less than 1,000 cps, the viscosity of the solution (for example, an aqueous solution) containing the cellulose ether compound is too low, so that the bonding strength of the cellulose ether compound to the pulverized coal is decreased, , The molecular weight of the cellulose ether compound is high and the water solubility is deteriorated, and the binding force to the pulverized coal is not sufficiently exerted.

The viscosity of the cellulose ether compound may be, for example, from 2,000 to 70,000 cps, for example, from 6,000 to 60,000 cps, such as from 7,000 to 50,000 cps, for example, from 8,000 to 40,000 cps, For example, 10,000 to 20,000 cps.

The binder for the briquette may be one for producing briquettes by binding pulverized coal. In the present specification, "pulverized coal" means coal having a particle size of 8 mm or less.

The pulverized coal may be bituminous coal. As used herein, "bituminous coal" means relatively soft coal containing a tar-like material 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, it is possible to prevent the pulverized coal from being destroyed by the pressure applied during the production of the pulverized coal. Accordingly, if the particle size of the pulverized coal is 4 mm or less, the finally produced molded coal can maintain a high strength.

The cellulose ether compound binds the particles of the pulverized coal to each other.

The cellulose ether compound is not only dissolved in water but also does not deposit on the inner surface of the nozzle when sprayed through the nozzle in an aqueous solution state, so that the nozzle hole is not blocked. In addition, since the cellulose ether-based compound is mixed with pulverized coal, stored and transported in the form of solid phase powder, and mixed with water at the final use stage, it is possible to miniaturize and simplify the storage facility and simplify the transportation facility . Further, since the same binding effect can be obtained even in a smaller amount than the molasses of the cellulose ether compound, the material cost can be reduced. In addition, the cellulose ether-based compound has an advantage that a molded charcoal having excellent strength can be obtained without using a strength-enhancing agent.

The cellulose ether compound may not contain carboxymethyl cellulose (CMC). If the cellulosic ether compound contains carboxymethyl cellulose (CMC), the strength of the briquettes produced using the composition for forming a blanket containing the binder for a briquette can be lowered.

The cellulose ether compound is selected from the group consisting of methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropylmethyl cellulose (HPMC) and hydroxyethyl methyl cellulose (HEMC) At least one kind of substance.

Wherein the hydroxyethyl cellulose (HEC) has a hydroxyethyl substitution degree of 20 to 80 wt%, the hydroxypropyl cellulose (HPC) has a degree of substitution of 20 to 80 wt%, and the hydroxypropyl cellulose Wherein the hydroxypropylmethylcellulose (HPMC) has a degree of methyl group substitution of 18 to 32 wt% and a degree of hydroxypropyl group substitution of 2 to 14 wt%, and the hydroxyethyl Methylcellulose (HEMC) may have a degree of methyl group substitution of 18 to 32 wt% and a degree of substitution of hydroxyethyl group of 2 to 14 wt%.

The cellulose ether 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 compound used is within the above range, a molded product having a high strength can be obtained even with a small addition amount as compared with molasses.

The binder for the briquette may further include 0 to 10,000 parts by weight of an additional binder with respect to 100 parts by weight of the cellulose ether compound. If the content of the additional binder is within the above range, it is possible to reduce the amount of the cellulose ether-based compound used, thereby reducing the manufacturing cost of the binder for a molding blanket and to increase the drying speed of the composition for forming a molding containing the binder for molding blanks It is possible to obtain a molded charcoal which is less dusty and has improved strength.

The additional binder is selected from the group consisting of 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, CASEIN, epoxy resin, (PITCH), polyamide, polyurethane, and polyvinyl acetal.

The binder for a briquette can be provided with a binder for a briquette improved in strength even if it does not contain a strength enhancer such as burnt lime, bentonite or other materials capable of enhancing the strength of the briquette.

Another embodiment of the present invention provides a briquette made using the binder for a briquette.

In the case of using the binder for a molded charcoal to produce a molded coal, 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 water is within the above range, it is possible to obtain a composition for forming a molding having an easy handling and a uniform composition, and it is possible to prevent the phenomenon that some components in the composition for forming a molding are adhered to the surface of the molding machine have.

The briquettes produced by using the binder for a briquette can not be used in the coke making process but can be used as a heat source for the FINEX process and the COREX process. Therefore, the briquettes produced above have a high thermal efficiency and a high drying speed.

A method for producing a molded charcoal from the above binder for a briquette is as follows. That is, the composition for forming a blend is prepared by mixing the binder for a briquette, pulverized coal and water, putting the composition for forming blend into the mold, and pressurizing the blend at a predetermined pressure.

The binder for a molded charcoal can provide a binder for a molded charcoal improved in strength even if it does not contain a strength reinforcing agent.

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

Example

Example  1 to 9 and Comparative Example  1-4

(Production of a composition for forming a forming vessel including a binder for a molding coal)

(ASNILAND, AQUALON ^TM , viscosity: 6,000 cps), molasses (CASHI INDUSTRIAL CO., LTD., Solids content: 77.2 g / m 2) % by weight, total equivalent: 49.3 wt%), calcium oxide (CaO content: not less than 70 wt%, powder: 170 mesh To obtain a first composition. Then, distilled water was added to the first composition to obtain a composition for forming a molded article. The contents of the components used in the above Examples and Comparative Examples are shown in Table 1 below.

(Production of Molded Carbon)

The prepared composition for forming a mold was compression-molded at a load of 70 kN using a Briquette machine (JEI Sanjie, JCB250T) to produce 50 molded bellows, and then 30 bellows were selected except for 20 bellows produced at the beginning and at the end . The weight of the above-prepared molded charcoal was 5 to 10 g.

Mixing ratio (parts 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: SFC ㈜, mecellose ^® PMC (PMC-60U), viscosity: 60,000 cps, a methyl group substitution degree: 23.2wt%, hydroxypropyl group substitution degree: 8.8wt%

HPMC2: SFC ㈜, mecellose ^® PMC (PMB-40H), viscosity: 4,000cps, methyl group substitution degree: 28.6wt%, hydroxypropyl group substitution degree: 6.1wt%

HPMC 3: HPMC, viscosity: 80,000 cps, methyl group substitution degree: 22.8 wt%, hydroxypropyl group substitution degree: 9.1 wt%

HPMC 4: HPMC, viscosity: 500 cps, methyl group substitution degree: 26.4 wt%, hydroxypropyl group substitution degree: 8.2 wt%

HPMC 5: HPMC, viscosity: 85,000 cps, methyl group substitution degree: 22.6 wt%, hydroxypropyl group substitution degree: 9.2 wt%

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

Evaluation example

Evaluation example  One

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

(Impact strength evaluation)

A rectangular parallelepiped tray (total weight: 0.5 kg) filled with sand was dropped from the 10 molded pieces upwardly at a height of 50 cm toward the above-mentioned blast furnaces. This drop test was repeated two more times, ten at a time, for the remaining 20 briquettes. Then, the total weight of the particles having a size of 10 mm or more among the remaining molded cans was expressed as a percentage of the weight of the cans before falling, and the value was evaluated as the impact strength. At this time, the larger the value obtained, the greater the impact strength. The impact strength is a criterion for determining the rate at which a plurality of drops fall and are lost when each of the molded-in-blends is conveyed by the conveyor belt.

(Evaluation of compressive strength)

The maximum strength at the time when the above-mentioned blast furnace was compressed at a rate of 5 mm / min in a material universal testing machine (Shin-Kogaku Kogyo Co., Ltd., AD-universal material testing machine-kN) was measured and recorded as compressive strength. The compressive strength is a criterion for judging the rate of breakage due to the self-load when each of the above-mentioned briquettes is stored in the storage tank.

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 blast furnaces produced in Examples 1 to 9 showed higher impact strength and compressive strength than the blast furnace prepared in Comparative Examples 1 to 4.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (6)

A binder for a molding lighter comprising at least one cellulose ether compound selected from the group consisting of alkylcellulose, hydroxyalkylcellulose, and hydroxyalkylalkylcellulose having a viscosity of 1,000 to 80,000 cps, . The method according to claim 1,
The cellulose ether compound is selected from the group consisting of methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropylmethyl cellulose (HPMC) and hydroxyethyl methyl cellulose (HEMC) A binder for a briquette comprising at least one material. 3. The method of claim 2,
Wherein the hydroxyethyl cellulose (HEC) has a hydroxyethyl substitution degree of 20 to 80 wt%, the hydroxypropyl cellulose (HPC) has a degree of substitution of 20 to 80 wt%, and the hydroxypropyl cellulose Wherein the hydroxypropylmethylcellulose (HPMC) has a degree of methyl group substitution of 18 to 32 wt% and a degree of hydroxypropyl group substitution of 2 to 14 wt%, and the hydroxyethyl Methylcellulose (HEMC) has a degree of methyl group substitution of 18 to 32 wt% and a substitution degree of hydroxyethyl group of 2 to 14 wt%. The method according to claim 1,
Wherein the cellulose ether compound is used in an amount of 0.01 to 15.0 parts by weight based on 100 parts by weight of the pulverized coal. The method according to claim 1,
Further comprising from 0 to 10,000 parts by weight of an additional binder based on 100 parts by weight of the cellulose ether compound. 6. The method of claim 5,
The additional binder is selected from the group consisting of 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, CASEIN, epoxy resin, (PITCH), polyamide, polyurethane, and polyvinyl acetal.