TW201610143A - Binder for coal briquette - Google Patents

Abstract

Provided is a binder for coal briquette. The binder for coal briquette may include at least one cellulose ether-based compound having a viscosity in a range of 1,000 cps to 80,000 cps and selected from the group consisting of alkyl cellulose, hydroxyalkyl cellulose, and hydroxyalkyl alkyl cellulose. The binder for coal briquette may not require an additional strength reinforcing agent may simplify the manufacture process of coal briquette, and may prepare coal briquette having a high strength.

Description

Briquetting agent

The invention discloses a binder for briquettes. In particular, the present invention discloses a binder for briquettes comprising a cellulose ether compound having a certain viscosity range.

Iron and steel manufacturing processes can be classified into: ironmaking processes for producing molten iron by charging iron ore and coal into a blast furnace; producing high-purity molten steel by removing impurities contained in molten iron (molten steel) steelmaking process; production of semi-finished products such as solid phase ingots from liquid molten steel; and rolling process for producing final steel products by processing semi-finished products such as ingots.

In the new iron and steel manufacturing process FINEX (fine ore reduction process) and COREX (smelting reduction process), the initial bituminous coal is loaded into the furnace instead of the bituminous coal as in the conventional iron and steel manufacturing process. Processed into coke.

Bituminous coal with a particle size greater than 8mm can be used immediately without any special However, the use of bituminous coal having a particle size of 8 mm or less may be limited due to reasons such as dust generation during operation. Therefore, after processing into a briquettes having a certain particle size, bituminous coal having a particle diameter of 8 mm or less can be used.

When bituminous coal having such a small particle size is treated into briquettes, it is conventionally used as a binder mainly by molasses. However, when the syrup is used as a binder, there are various disadvantages as follows.

First, when the syrup is used as a binder, since the strength of the finally produced briquettes is weak, it is necessary to additionally use a strength enhancer such as quicklime, bentonite or a mixture thereof in order to enhance the strength of the briquettes.

Then, when working, odor from the syrup may be generated.

In addition, since the syrup has a viscous liquid form and its viscosity increases with decreasing temperature, the problem is that the syrup is attached to the storage tank, the pipe, and the nozzle during storage, transportation, and spraying. Therefore, equipment (for example, a high pressure pump and a heating device) is required in order to prevent such problems. Therefore, when the syrup is used as a binder, the manufacturing process of the briquettes becomes complicated.

In addition, because the syrup is derived from natural materials, its viscosity may not be constant depending on the source, supplier, and supply time, making it difficult to maintain the quality of the briquettes constantly.

In addition, the syrup must be used in a large amount, since the syrup is liquid and has a low density, and thus there is a disadvantage that it is necessary to use a large-capacity storage facility, and the number of transported goods and related transportation costs increase.

In addition, there are disadvantages in the supply of syrup and the instability of the price.

According to an exemplary embodiment of the present invention, the briquetting agent may include at least one cellulose ether-based compound having a viscosity range selected from the group consisting of alkyl cellulose, A group consisting of hydroxyalkyl cellulose and hydroxyalkyl alkyl cellulose.

According to an aspect of the present invention, there is provided a binder for briquettes comprising at least one cellulose ether-based compound having a viscosity in the range of 1,000 cps to 80,000 cps and selected from the group consisting of alkyl cellulose, A group consisting of hydroxyalkyl cellulose and hydroxyalkyl alkyl cellulose.

Coal briquettes can be used to prepare briquettes by 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-based compound may include at least one material selected from the group consisting of methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), and hydroxypropyl methyl cellulose ( Group of HPMC) and hydroxyethyl methylcellulose (HEMC).

The MC may have a methyl substitution degree in the range of 18% by weight to 32% by weight, and the HEC may have a degree of hydroxyethyl substitution in the range of 20% by weight to 80% by weight, and the HPC may have 20% by weight to 80% by weight a range of hydroxypropyl substitution, the HPMC may have a degree of methyl substitution in the range of 18% to 32% by weight, and a degree of hydroxypropyl substitution in the range of 2% to 14% by weight, and the HEMC may have The degree of methyl substitution in the range of 18% by weight to 32% by weight, and the degree of hydroxyethyl substitution in the range of 2% by weight to 14% by weight.

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

The briquette binder further contains an additional binder in a range of more than 0 to 10,000 parts by weight based on 100 parts by weight of the cellulose ether-based compound.

The additional binder may comprise at least one material selected from the group consisting of syrup, corn starch, wheat starch, potato starch, polyethylene glycol (PEG), polyvinyl alcohol (PVA), polyacrylamide (PAM), sucrose, Liquid glucose, Acacia gum, tragacanth, gelatin, alginic acid, polymethacrylate, polyvinylpyrrolidone (PVP), sodium polyacrylate, polyvinyl methyl ether (PLM), asphalt (asphalt), asphalt (bitumen) ), a group of casein, epoxy, pitch, polyamido, polyurethane, and polyvinyl acetal.

The briquetting agent according to an exemplary embodiment of the present invention may include a cellulose ether compound having a certain viscosity range. Therefore, the total amount of the binder used can be reduced (to the extent that the syrup is used for 100% binder, reduced to 1/10 of the amount of syrup used), and the use of an additional strength enhancer can be used to simplify the briquettes. The manufacturing process and the manufacture of high-strength briquettes, which maintain a stable supply and price compared to syrup.

Further, the briquettes for the briquettes including the cellulose ether-based compound are colorless and odorless and do not emit odor, thereby improving the working environment.

Hereinafter, a binder for briquettes according to an exemplary embodiment will be described in detail. The briquetting agent according to an exemplary embodiment may include at least one cellulose ether-based compound having 1,000 to 80,000 centipoise (cps) or mPa. s range of viscosity and selected from alkyl fibers Group of components of hydroxyalkyl cellulose and hydroxyalkyl alkyl cellulose.

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

When the viscosity of the cellulose ether-based compound is less than 1,000 cps, the viscosity of the solution containing the cellulose ether-based compound (for example, an aqueous solution) may be extremely low, resulting in a low bonding strength of the cellulose ether-based compound to the pulverized coal. When the viscosity of the cellulose ether-based compound is more than 80,000 cps, the molecular weight of the cellulose ether-based compound may be high and has low water solubility, resulting in insufficient adhesion strength of the cellulose ether-based compound to the pulverized coal.

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

Coal briquettes can be used to prepare briquettes by bonding pulverized coal. In the present specification, the term "powder" means coal having a particle diameter of 8 mm or less.

The pulverized coal can be bituminous coal. In the present specification, the term "bituminuous coal" means a relatively soft and tar-containing material. Coal (called asphalt).

The pulverized coal may have a particle diameter of 4 mm or less. When the particle size of the pulverized coal is 4 mm or less, the breakage of the pulverized coal due to the application of pressure can be prevented during the manufacturing process of the briquettes. Thus, when the particle size of the pulverized coal is 4 mm or less, the finally formed briquettes may maintain high strength.

The cellulose ether-based compound acts to bind the particles of the pulverized coal together.

The cellulose ether-based compound can be easily dissolved in water, and when the cellulose ether-based compound in an aqueous solution state is injected through a nozzle, the cellulose ether-based compound can be not deposited on the inner surface of the nozzle so that it can be blocked Nozzle orifice. In addition, since the cellulose ether-based compound can be stored and transported as a solid phase powder alone or in a mixed form with pulverized coal, and mixed with water at the end of use, the miniaturization and simplification of the storage facility and the simplification of the transportation equipment become may. Further, even if the amount of the cellulose ether-based compound is less than the amount of the syrup, the cellulose ether-based compound can have the same bonding effect as the syrup, resulting in a reduction in material cost. Further, when a cellulose ether-based compound is used, a briquettes having excellent strength can be obtained even without using a strength enhancer.

The cellulose ether compound may not include carboxymethyl cellulose (CMC). If the cellulose ether compound includes CMC, use a binder containing coal briquettes The strength of the briquettes prepared by forming the briquettes of the agent may be reduced.

The cellulose ether-based compound may include at least one material selected from the group consisting of methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), and hydroxypropyl methyl cellulose ( Group of HPMC) and hydroxyethyl methylcellulose (HEMC).

The MC may have a methyl substitution degree in the range of 18% by weight to 32% by weight, and the HEC may have a degree of hydroxyethyl substitution in the range of 20% by weight to 80% by weight, and the HPC may have 20% by weight to 80% by weight a range of hydroxypropyl substitution, the HPMC may have a degree of methyl substitution in the range of 18% to 32% by weight, and a degree of hydroxypropyl substitution in the range of 2% to 14% by weight, and the HEMC may have The degree of methyl substitution in the range of 18% by weight to 32% by weight, and the degree of hydroxyethyl substitution in the range of 2% by weight to 14% by weight.

The cellulose ether-based compound is used in an amount of from 0.01 part by weight to 15.0 parts by weight based on 100 parts by weight of the pulverized coal. When the cellulose ether-based compound is used in the above range, even if the amount of the cellulose ether-based compound to be added is small compared to the amount of the syrup added, a briquettes having high strength can be obtained.

The briquette binder further comprises an additional bond in the range of more than 0 to 10,000 parts by weight based on 100 parts by weight of the cellulose ether compound. Agent. When the amount of the additional binder is within the above range, the manufacturing cost of the binder for the briquettes can be reduced by reducing the amount of the cellulose ether-based compound used, and the briquettes containing the binder for the briquettes can be increased. The drying rate of the composition, and can reduce or prevent dust generation, and obtain briquettes with improved strength.

The additional binder may comprise at least one material selected from the group consisting of syrup, corn starch, wheat starch, potato starch, polyethylene glycol (PEG), polyvinyl alcohol (PVA), polyacrylamide (PAM), sucrose, Liquid glucose, gum arabic, tragacanth, gelatin, alginic acid, polymethacrylate, polyvinylpyrrolidone (PVP), sodium polyacrylate, polyvinyl methyl ether (PLM), tar, asphalt, cheese A group of proteins, epoxy resins, asphalt, polyamides, polyurethanes, and polyvinyl acetals.

The briquette binder can provide briquettes with improved strength even without including strength enhancers that improve the strength of the briquettes, such as quicklime, bentonite, or other materials.

According to another exemplary embodiment of the present invention, a briquettes prepared by using a binder for briquettes may be provided.

When a briquettes are used to prepare briquettes, water in a range of more than 0 to 15.0 parts by weight may be used based on 100 parts by weight of the pulverized coal. When the amount of water is within the above range, it is easy to handle and has a uniform composition. The briquettes form a composition and prevent adhesion of some components of the briquettes forming composition to the surface of the molding machine during the briquetting molding process.

The briquettes prepared using cement briquettes can be used not as a coke generation process, but as a heat source in the FINEX process and the COREX process. Therefore, the prepared briquettes can have advantages such as high thermal efficiency and rapid drying rate.

The method of using briquettes to prepare briquettes is as follows. That is, the briquettes may be mixed together with a binder, pulverized coal, and water to prepare a briquettes forming composition; and the prepared briquettes forming composition may be injected into the mold; and then a predetermined pressure may be applied thereto. Prepare briquettes.

The briquette binder can provide a briquetting binder with improved strength even in the case of a strength enhancer.

Mode of inventive concept

Hereinafter, the present invention will be described in detail with reference to examples; however, the invention is not limited thereto.

Instance

Examples 1 to 9 and Comparative Examples 1 to 4

(Preparation of briquettes forming a binder containing coal briquettes to form a composition)

According to the composition and amount listed in Table 1, pulverized coal (available from SK Networks Co., Ltd., particle size: 0.1 to 5 mm) and optionally hydroxypropylmethylcellulose, carboxymethylcellulose (CMC) ) (available from Ashland Co. (Ashland Co., Ltd), AQUALON TM; viscosity: 6,000 cps), syrup (available from Kcchem Co., Ltd; solid content: 77.2 wt%; total equivalent weight : 49.3 wt%), quicklime (available from Chungmoo Chemical Co., Ltd; CaO content: 70% by weight or more; powder fineness: 95% by weight thereof passed through a 170 mesh sieve (89 μm)), thereby obtaining the first Composition. Then, distilled water was added to the first composition to obtain a briquettes-forming composition. The amounts of the components used in the respective examples and comparative examples are shown in Table 1.

(Preparation of briquettes)

By using a briquetting machine (available from Jeil Machinery Co., Ltd., JCB250T), a composition stamper was formed on the prepared briquettes using a 70 kN load to prepare 50 briquettes. Then, 30 coal briquettes other than the 20 briquettes prepared at the beginning and at the end were removed. The weight of each briquettes in the prepared briquettes is from 5 g to 10 g.

HPMC 1: Samsung Fine Chemicals Co., Ltd., Mecellose ^® HPMC (PMC-60U); viscosity: 60,000 cps; methyl substitution: 23.2% by weight; and degree of substitution of hydroxypropyl group : 8.8 wt%.

HPMC 2: Samsung Fine Chemicals Co., Ltd., Mecellose ^® HPMC (PMB-40H); viscosity: 4,000 cps; degree of substitution of methyl group: 28.6% by weight; and degree of substitution of hydroxypropyl group: 6.1% by weight.

HPMC 3: Samsung Fine Chemicals Co., Ltd, HPMC; viscosity: 80,000 cps; degree of substitution of methyl group: 22.8% by weight; and degree of substitution of hydroxypropyl group: 9.1% by weight.

HPMC 4: Samsung Fine Chemicals Co., Ltd, HPMC; viscosity: 500 cps; degree of substitution of methyl group: 26.4% by weight; and hydroxypropyl group Degree of substitution: 8.2% by weight.

HPMC 5: Samsung Fine Chemicals Co., Ltd, HPMC, viscosity: 85,000 cps, degree of substitution of methyl group: 22.6% by weight, and degree of substitution of hydroxypropyl group: 9.2% by weight.

CMC: Ashland Co., Ltd, AQUALON TM; and the viscosity: 6,000cps.

Evaluation example

Evaluation example 1

The impact strength and compressive strength of the briquettes prepared in Examples 1 to 9 and Comparative Examples 1 to 4 were evaluated as follows. The results are shown in Table 2.

(anti-impact strength evaluation)

A sand-filled rectangular parallelepiped tray (total weight: 0.5 kg) was dropped from the 50 cm height on 10 coal briquettes toward the 10 coal briquettes. The drop test was repeated twice, with 10 briquettes at a time, for the remaining 20 briquettes. Then, the total weight of the particles of the existing briquettes having a particle diameter of 10 mm or more is expressed by a percentage relative to the total weight of the briquettes before the drop test, and the value is used as an impact resistance. Strength is assessed. Here, the larger the value obtained, the larger the impact strength. When the briquettes are transported by a conveyor belt, the impact strength is a reference for determining the rate of loss attributed to several drops.

(compressive strength evaluation)

When the coal briquettes are compressed at a rate of 5 mm/min in a universal testing machine (available from Shin Gang Precision IND. Co., Ltd.; AD-Universal Testing Machine-kN), the coal is measured. The maximum strength of the brick. The measured values are recorded as compressive strength. When the briquettes are stored in a storage tank, the compressive strength is a reference for determining the damage rate caused by the weight of the briquettes themselves.

Referring to Table 2, it was found that the respective briquettes prepared in Examples 1 to 9 had greater impact strength and compressive strength than the briquettes prepared in Comparative Examples 1 to 4.

Although the inventive concept has been specifically shown with reference to its exemplary embodiments And the description, but it will be understood by those of ordinary skill in the art that various changes in form and detail can be made therein. Accordingly, the scope of the invention is defined by the scope of the appended claims.

Claims (6)

A briquetting cement for preparing a briquettes by binding pulverized coal, the briquetting binder comprising at least one cellulose ether compound having a range of 1,000 cps to 80,000 cps The viscosity is selected from the group consisting of alkyl cellulose, hydroxyalkyl cellulose, and hydroxyalkyl alkyl cellulose. The binder for briquettes according to claim 1, wherein the cellulose ether compound comprises at least one material selected from the group consisting of methyl cellulose (MC), hydroxyethyl cellulose (HEC), and hydroxypropyl fibers. A group consisting of HPC, hydroxypropyl methylcellulose (HPMC) and hydroxyethyl methylcellulose (HEMC). The briquetting binder according to claim 2, wherein the methyl cellulose (MC) has a methyl substitution degree in the range of 18% by weight to 32% by weight, and the hydroxyethyl cellulose (HEC) may have 20 The degree of hydroxyethyl substitution in the range of from 8% by weight to 80% by weight, the hydroxypropylcellulose (HPC) may have a degree of hydroxypropyl substitution in the range of from 20% by weight to 80% by weight, the hydroxypropylmethylcellulose (HPMC) may have a degree of methyl substitution in the range of 18% by weight to 32% by weight, and a degree of hydroxypropyl substitution in the range of 2% by weight to 14% by weight, and the hydroxyethyl methylcellulose (HEMC) may be used. The degree of methyl substitution in the range of 18% by weight to 32% by weight, and the degree of hydroxyethyl substitution in the range of 2% by weight to 14% by weight. The binder for briquettes according to claim 1, wherein the cellulose ether-based compound is used in an amount of from 0.01 part by weight to 15.0 parts by weight based on 100 parts by weight of the pulverized coal. The briquette binder according to claim 1, wherein the cellulose ether compound further contains an additional binder in a range of more than 0 to 10,000 parts by weight based on 100 parts by weight of the cellulose ether compound. The briquetting agent according to claim 5, wherein the additional binder comprises at least one material selected from the group consisting of syrup, corn starch, wheat starch, potato starch, polyethylene glycol (PEG), polyvinyl alcohol ( PVA), polyacrylamide (PAM), sucrose, liquid glucose, gum arabic, tragacanth, gelatin, alginic acid, polymethacrylate, polyvinylpyrrolidone (PVP), sodium polyacrylate, polyethylene Groups of methyl ether (PLM), asphalt, asphalt, casein, epoxy, asphalt, polyamide, polyurethane, and polyvinyl acetal.