KR101949314B1 - Coal briquettes using polymer binder of particle type and method for manufacturing the same - Google Patents

Abstract

A coal briquette having excellent early stage strength and drop strength by using a particulate polymer binder and a method for manufacturing the same are disclosed. The method for manufacturing coal briquette using the particulate polymer binder comprises the steps of: (a) adding and mixing 0.1-10 parts by weight of the particulate polymer binder with respect to 100 parts by weight of a raw material including at least one of coal and pulverized coal; and (b) adding 5-15 parts by weight of distilled water to the mixed raw material and the binder to swell the particulate polymer binder, followed by press-molding.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a molded body using a particulate polymer binder,

TECHNICAL FIELD The present invention relates to a molded body, and more particularly, to a molded body using a particulate polymer binder and a method of manufacturing the same.

A blast furnace is used for the manufacture of steel, in which coke and sinter are injected, and the coke is produced from coal, which is a coking coal. The cokes used for the production of blast furnace cokes generate spontaneous combustion as well as a considerable amount of pulverized coal (dust) due to factors of the external environment during transportation from the production site to the final consumer site.

Since the generation of pulverized coal leads to the loss of coking coal (coal), and the loss reaches tens of tons per hour, much research has been conducted on the development of technology for appropriately recycling the pulverized coal generated.

For example, a pulverized coal is mixed with a binder such as quicklime and molasses, and then compressed to produce a molded coal. Since the briquettes must have excellent strength, the binder used in the briquetting coal should have the property of maintaining excellent adhesive strength and high strength at high temperature.

However, there is a disadvantage that binders such as quicklime and molasses are required to be dissolved in a solution, and since the binder itself is water-soluble and has a high moisture content, there is a problem that it is difficult to secure a sufficient strength of the briquette at an early stage.

A background art related to the present invention is Korean Registered Patent No. 10-1418053 (Registered on Apr. 3, 2014), and the above-mentioned literatures discloses a method of producing molded carbon and a method for producing the same.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing molded coal excellent in workability using a particulate polymer binder.

Another object of the present invention is to provide a molded charcoal having high strength.

According to an aspect of the present invention, there is provided a method of manufacturing a blast furnace comprising the steps of: (a) adding 0.1 to 10 parts by weight of a particulate polymer binder to 100 parts by weight of a raw material containing at least one of coal and pulverized coal, step; And (b) 5 to 15 parts by weight of distilled water is added to the mixed raw material and the particulate polymer binder to swell the particulate polymer binder, followed by pressure molding.

The particulate polymer binder may include a polyacrylamide-based compound.

The viscosity of the fine particle type polymer binder may be 3000 to 8000 cps.

The weight average molecular weight of the fine particle type polymer binder may be 2 횞 10 ⁶ to 25 Х 10 ⁶ .

In the step (a), the average particle diameter of the fine particle type polymeric binder may be 0.02 to 0.1 mm.

In the step (b), the water content of the particulate polymer binder after swelling the particulate polymer binder with respect to 100 parts by weight of the starting material may be 10 to 20 parts by weight.

After the step (b), the press-molded product may be dried at room temperature for 1 to 24 hours.

In order to achieve the above-mentioned other objects, the present invention provides a method of producing a molded coal, comprising: 0.1 to 10 parts by weight of a particulate polymer binder and 5 to 15 parts by weight of distilled water, based on 100 parts by weight of a raw material containing at least one of coal and pulverized coal; .

The particulate polymer binder may include a polyacrylamide-based compound.

The method for producing a molded coal according to the present invention is advantageous in that the use of a particulate polymer binder makes it possible to produce a molded product using a binder such as polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC) Is excellent.

In addition, since the fine particle type polymeric binder according to the present invention is fast in absorbing water, it is easy to control the water content as it becomes gel when added with distilled water.

In addition, even if a small amount of fine particle type polymeric binder is added to the molten carbonate mortar according to the present invention, the initial strength and drop strength of the molten carbonate mortar can be minimized.

Fig. 1 is a flowchart showing a method for producing a molded charcoal according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a method for producing a molded coal using a particulate polymer binder, and more particularly, to a method for producing a molded coal according to the present invention. Referring to FIG. 1, a method for producing a blast furnace according to the present invention includes mixing a raw material and a particulate polymer binder (S110), and adding a distilled water to a press molding step (S120).

Mixing the raw material and the particulate polymer binder (S110)

First, a raw material containing at least one of coal and pulverized coal is prepared.

Coal is a conventional coal for producing coke having an average particle diameter of 5 mm or less, and porous coal in which a void is formed can be used. Pulverized coal is generated in the course of transferring coal from a production site to a consumer site. Pulverized coal having an average particle diameter of 8 mm or less, specifically, 4 mm or less can be used. As the pulverized coal, raw materials containing carbon such as bituminous coal, subbituminous coal, anthracite, and coke can be used.

Next, 0.1 to 10 parts by weight of a particulate polymer binder is added to 100 parts by weight of the raw material and mixed. At this time, the mixing can be carried out at room temperature ± 5 ° C, and can be stirred for about 10 minutes to 1 hour.

In the present invention, 0.1 to 10 parts by weight of the fine particle type polymer binder is preferably added to 100 parts by weight of the raw material, more preferably 0.2 to 3 parts by weight. By using the fine particle type polymer binder, it is possible to produce molded articles of high strength with only a small amount of the conventional PVA series binder.

When the content of the fine particle type polymeric binder is less than 0.1 part by weight, the content of the binder is too low, so that the bonding force of the raw material may be insufficient in the process of producing the molded carbon. If the content is more than 10 parts by weight, do.

Conventionally, a method of dissolving a binder such as PVA (poly (vinylalcohol)) series or CMC (carboxymethyl cellulose) series in a solution was used. When the binder is in the form of a solution, since the binder is added in an amount of 10 to 20% by weight in the production of the shaped coal, the molecular weight is low and it is troublesome to dry separately. When the binder is in an emulsion form, it is possible to increase the molecular weight by adding 25 to 50% by weight of the binder in the production of the shaped coal, but there is a limit in producing high-strength molded charcoal only by the content of the binder.

In addition, since this method must dissolve the binder in the solution, it may be difficult to control the water content of the binder and to lower the workability.

In order to solve such a problem, in the present invention, in the case of forming a molded product, even though a small amount of a binder in the form of a powder containing a polyacrylamide-based compound is added, an effect of adding 80% or more is obtained and the molecular weight can be increased .

Therefore, in the present invention, it is possible to use a fine particle type polymer binder which has a high water absorption rate and is easy to control the moisture content, that is, a polyacrylamide-based binder, instead of the conventional PVA (poly (vinylalcohol) The present invention relates to a method for producing a molded particle,

In order to improve the permeability of the binder to the raw material containing at least one of the coal and the pulverized coal, it is preferable that the fine particle type polymeric binder is reprocessed in the form of fine particles having an average particle diameter of 0.02 to 0.1 mm in powder form. That is, it is preferable that the particulate polymer binder used in the briquette be in the form of fine particles having an average particle diameter of 0.02 to 0.1 mm. If the particle size is out of this range, the permeability of the binder to the raw material is lowered and the swelling (GEL) degradation may occur.

The fine particle type polymeric binder may contain 90% or more of a binder having an average particle diameter of 0.02 to 0.1 mm.

The particulate polymer binder may include a polyacrylamide-based compound, and the polyacrylamide is represented by [Structural Formula 1].

[Structural formula 1]

(n은 1~10,000의 정수이다.)

(n is an integer of 1 to 10,000)

Specifically, the particulate polymer binder may include a particulate anionic binder, a particulate nonionic binder, and a particulate cationic binder. For example, the particulate anionic binder may comprise sodium 2-propenoate 2-propenamide polymer (CAS 25987-30-8), and the particulate nonionic binder And the particulate cationic binder may comprise ethanaminium, N, N, N-trimethyl-2 - [(1-oxo-2-propenyl) oxy] , N, N, N-trimethyl-2 - [(1-oxo-2-propenyl) oxy] chloride, CAS 5039-78-1).

[Table 1]

Referring to Table 1, the 1% solution viscosity is a value obtained by measuring the viscosity of a binder having a concentration of 1 wt% at room temperature using LV3, and the viscosity of the particulate polymer binder may be 3000 to 8000 cps . When the viscosity of the fine particle type polymeric binder is less than 3000 cps, the viscosity of the mixture containing the raw material, the fine particle type polymer binder and water is too low, so that the bonding force to the raw material is lowered and the strength of the molded product may be lowered. On the other hand, when the viscosity exceeds 8000 cps, the weight average molecular weight of the binder becomes too high, and the binding force to the raw material may not be sufficient due to a decrease in the swelling property with respect to water.

Referring to Table 1, the weight average molecular weight of the fine particle type polymer binder may be 2 × 10 ⁶ to 25 × 10 ⁶ . If the weight average molecular weight is out of this range, the bonding strength to the raw material may be lowered, the strength of the molded bodys may be lowered, and the workability may be lowered in the process of producing the bodied carbon.

After the addition of the distilled water, the pressure forming step (S120)

Next, 5 to 15 parts by weight of distilled water is added to the mixed raw material and the binder to swell the particulate polymer binder, followed by compression molding. When the distilled water is added, the stirring temperature is preferably ± 5 ° C at room temperature, and the process can be performed without any problem even in the mechanical exothermic (80 ° C or less) occurring in a commercial continuous process in this temperature range.

When 5 to 15 parts by weight of distilled water is added, the swelling function of the particulate polymer binder is activated as the particulate polymer binder having a high water absorption rate is quickly gelated. Thus, the surface of the raw material is modified with a binder to provide excellent permeability .

When distilled water is added, it is preferable to swell such that the water content of the fine particle type polymeric binder is 10 to 20 parts by weight per 100 parts by weight of the raw material. When the water content is less than 10 parts by weight, the performance of the binder is deteriorated due to the lowering of the swelling property. When the water content exceeds 20 parts by weight, the bonding force of the molded articles decreases and the amount of heat of the molded articles decreases.

The water content refers to a ratio of water content, and the water content is calculated based on the amount of water input based on 100 parts by weight of the raw material.

The press-molding may be carried out according to the press molding according to the process equipment, and may be preferably performed by applying a compressive strength of 10 to 30 kgf at room temperature to 80 ° C. Under these conditions, the pressurized molded bellows have improved mixing efficiency of the resultant product, and thus have an excellent initial strength of the briquette.

If the compressive strength is less than 10 kgf, the initial strength and drop strength of the briquette may be low. On the contrary, when the compressive strength exceeds 30 kgf, the physical properties of the briquette may be deteriorated as the strength is increased.

For example, it is possible to press-form using two pressing rollers, but the present invention is not limited thereto.

After the distilled water is added, after the press molding step (S120), the press-molded product may be dried at room temperature for 1 hour to 24 hours.

The resultant of the press-molding according to the present invention, that is, the molded product has an excellent initial strength, and when the product is dried at room temperature for 1 to 24 hours in this state, the drop strength of the molded product is improved. Concretely, as the drying time at room temperature increases from 1 hour to 24 hours, at the same time, as the compression strength is increased, the falling strength of the briquette increases gradually, and the shape retention ratio of the briquette is also increased.

As described above, the method for producing molded coal using the fine particle type polymeric binder of the present invention is superior to the method for producing molded coal using a binder such as PVA series in the prior art, and can produce molded briquettes of high strength with only a small amount of binder have.

The molded coal according to the present invention comprises 100 parts by weight of a raw material containing at least one of coal and pulverized coal, 0.1 to 10 parts by weight of a particulate polymer binder, and 5 to 15 parts by weight of distilled water.

The raw materials, the particulate polymer binder, and distilled water are as described above in the production method.

Specific examples of the molded carbon using the particulate polymer binder and the manufacturing method thereof will be described below.

1. Manufacture of briquette

Examples 1 to 3 and Comparative Examples 1 to 3

First, a binder was added to 100 parts by weight of bituminous coal (coal raw material) and mixed. Subsequently, distilled water was added to the mixed bituminous coal and the binder, followed by stirring at room temperature for 10 minutes. Subsequently, molding was carried out by press molding at room temperature using a pellet machine (1.5 占 2 cm).

The contents and the compressive strengths of the components used in the above respective Examples and Comparative Examples are shown in Table 2 below.

[Table 2]

* The SNF KORES product (manufacturer: A-330P) has a viscosity of 6500 cps and a weight average molecular weight of 15 × 10 ⁶ . The SNF KORES product has a particle diameter of 0.02 to 0.1 mm and a water content of 10 to 20 parts by weight.

The results are shown in Table 3 and Table 4, in which the briquettes prepared according to Examples 1 to 3 and Comparative Examples 1 to 3 were dried at room temperature for 1 hour and 24 hours, respectively.

The percentage of shape retention (%) is the percentage of the initial weight of the briquette to the weight of the differentiated briquettes by dropping the briquettes three times at a height of 5 m.

Shape Retention Rate (%) = (Weight of Molded Charged by Falling / Weight of First Briquette) Х100

[Table 3]

[Table 4]

Referring to [Table 3] and [Table 4], the shape retention ratios of the briquettes of Examples 1 to 3 using SNF KORES products as binders are much higher than those of Comparative Examples 1 to 3 using molasses as a binder.

Particularly, in Examples 1 to 3, as the drying time at room temperature and the compressive strength are increased, the shape retention ratio of the molded can is increased. Specifically, when the room temperature drying time satisfies 20 to 22 hours and the compressive strength satisfies 16 to 25 kgf, it can be confirmed that the shape retention ratio of the molded charcoal is 90% or more.

As described above, the shaped coal using the fine particle type polymeric binder according to the present invention has an effect of not only an initial strength but also a falling strength by stirring, pressurizing and drying at room temperature. Particularly, by adding a small amount of a particulate polymer binder capable of adjusting the water content, it can be confirmed that an excellent workability is obtained in the process of producing the molded coal, and the molded coal of high strength is provided.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (9)

(a) adding and mixing 0.1 to 10 parts by weight of a particulate polymer binder to 100 parts by weight of a raw material containing at least one of coal and pulverized coal; And
(b) 5 to 15 parts by weight of distilled water is added to the mixed raw material and the particulate polymer binder to swell the particulate polymer binder, followed by pressure molding,
The particulate polymer binder in step (a) is obtained by reprecipitating a powdery polymer binder,
Wherein the particulate polymer binder comprises a polyacrylamide-based compound.
delete The method according to claim 1,
Wherein the viscosity of the fine particle type polymeric binder is 3000 to 8000 cps.
The method according to claim 1,
Wherein the weight average molecular weight of the fine particle type polymer binder is 2 x 10 ⁶ to 25 x 10 ⁶ .
The method according to claim 1,
Wherein the average particle diameter of the fine particle type polymeric binder in the step (a) is 0.02 to 0.1 mm.
The method according to claim 1,
Wherein the water content of the particulate polymer binder after the swelling of the particulate polymeric binder with respect to 100 parts by weight of the starting material in the step (b) is 10 to 20 parts by weight.
The method according to claim 1,
After the step (b)
And drying the press-molded product at room temperature for 1 hour to 24 hours.
0.1 to 10 parts by weight of a particulate polymer binder based on 100 parts by weight of a raw material containing at least one of coal and pulverized coal,
Wherein the particulate polymer binder includes water,
Wherein the particulate polymer binder comprises a polyacrylamide-based compound,
Wherein the raw material surface is modified with a particulate polymer binder.


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