KR20160076945A - Method for manufacturing coal briquettes, and the device - Google Patents

Abstract

The present invention provides a method for manufacturing coal briquettes, and an apparatus therefor. According to the present invention, the method for manufacturing coal briquettes comprises: a coking coal supply step of supplying coking coal having a uniform particle size; a binder and hardener supply step of supplying a binder and hardener to be mixed in the coking coal; a mixing step of mixing the coking coal supplied in the coking coal supply step with the binder and hardener supplied in the binder and hardener supply step; a primary coal briquette manufacturing step of manufacturing coal briquettes by forming a mixed coal derived by mixing the coking coal with the binder and hardener in the mixing step; a particles size selection step of selecting coal briquettes having a particle size of greater than or equal to 10 mm and powder coal briquettes having a particle size of equal to or less than 10 mm manufactured in the coal briquette manufacturing step; and a secondary coal briquette manufacturing step of manufacturing coal briquettes by being supplied with the powder coal briquettes selected in the particle size selection step and forming the same. The present invention simplifies a conventional process of reusing powder coal briquettes, reduces incidental expense required for processing, and, since the powder coal briquettes are not used with coking coal, reduces quality difference of the coal briquettes.

Description

[0001] METHOD FOR MANUFACTURING COAL BRIQUETTES, AND THE DEVICE [0002]

More particularly, the present invention relates to a method and apparatus for producing molded coal used for a heat source and a reducing agent in a melting and reducing steel making process, and more particularly, The present invention relates to a method of manufacturing a shaped carbon which is produced by directly molding the atomized shaped carbon produced in the process in the process of manufacturing the shaped carbon and the apparatus.

In general, the molten steel reduction method is a method of directly using general coal, which is difficult to use as a fuel and a reducing agent in the blast furnace process, and producing molten iron by directly using iron ore as a steel source. In the melting reduction steelmaking method, the FINEX process consisting of a melter-gasifier connected to a fluidized-bed reduction reactor is a typical commercial method. The briquetting coal used in the melter-gasifier is subjected to a post-production storage process, in which a drop impact is applied to the belt-to-belt chute between the transports, and a compressive load is applied in the storage bin to ensure sufficient cold quality .

In order to ensure such a cold quality, a coking coal is crushed to a proper particle size to prepare a blended coal, a hot quality improving additive is blended, and then dried with an appropriate amount of water to prepare a final molded coal using a binder and a curing agent.

During the storage process after the briquette production process, about 10 ~ 15% of the less than 10mm of the blooming coal that can not be charged to the melter gasification furnace occurs. In this way, the generated minute briquettes are reused in the raw material processing step or reused in the mixing step.

Bulk-shaped coal generated during the molding process occupies a large percentage of 10 ~ 15% of the amount of molded-on-carbon production. Such blooming coal is reused for recharging the raw coal or used for re-charging in the mixing process. However, the additional costs incurred in the operation and maintenance of facilities for rehabilitation are continuously generated, which causes the increase in the manufacturing cost of the briquette. In addition, the burden of investment is high due to the large distance and space limitations from the stock house to the charging process. In addition, it is a cause of lowering the operating rate of the briquette process due to various problems in the equipment configured to be reused.

When re-using the minute briquetted carbon, the quality of the briquette is deteriorated due to unevenness such as the particle size and moisture of the minute briquette, which is a negative factor for stable operation of the briquette. Particularly, when the generation of boil-off gas is increased when the quality of cold is deteriorated, the amount of briquette production may be insufficient rather than the required amount by melt-gasification. When re-using the blast-furnace charcoal in the charging process or the blending process, it is used at about 5 ~ 20 wt% of the coking coal as it is in the existing process to recycle the blast furnace. Although it is a process that does not exist, it has meaning only for simple recycling.

In order to solve this problem, the blow molding coal generated in the process is generated by the blow molding coal, and at the same time, it is adjusted to the appropriate moisture in the stock house loaded with the melting and gasifying furnace, It is possible to simplify the process of re-using the blast-furnace coal to reduce the cost incurred in the process and to reduce the quality deviation of the blast furnace because the blast-furnace charcoal is not used together with the raw charcoal, The purpose of this project is to improve the production capacity as much as the incidence of blooming of the existing briquette production capacity by directly injecting the briquette into the melting furnace like ordinary briquette.

The present invention relates to a method for producing a blast furnace, comprising the steps of forming a blast furnace generated in a molding process and producing blast furnace at the same time as adjusting the blast furnace to a suitable moisture content in a stock house furnished with a melter- It is possible to simplify the process of re-using the blast-furnace coal to reduce the cost incurred in the process and to reduce the quality deviation of the blast furnace because the blast-furnace charcoal is not used together with the raw charcoal, And to provide a method for manufacturing a molded carbon which can improve the production capacity by the rate of generation of the minute-shaped carbon in the capacity of producing the existing molded-carbon by charging the molded-in directly with the molten-

According to an embodiment of the present invention, there is provided a method for supplying coking coal having a particle size of a predetermined size,

Providing a binder and a curing agent for providing a binder and a curing agent to be mixed with the coke,

A mixing step of mixing the cyanogen provided in the cyanogen providing step with the binder and the curing agent provided in the curing agent providing step with the binder,

A first molding step of molding the mixed carbon obtained by mixing the coke, the binder and the curing agent in the mixing step to produce a molded carbon,

A particle size sorting step for selecting the molded carbon particles having a particle size of 10 mm or more and the minute-shaped particles having a particle size of 10 mm or less among the molded products produced in the molded-

And a second molding step for molding the molding molded carbon by supplying the selected molding molds in the size selecting step.

And a step of storing the briquettes, which are provided between the first briquette forming step and the briquetting step, and storing the briquettes produced in the first briquetting step, and supplying the briquette to the briquetting step.

And a moisture addition step provided between the particle size selecting step and the second molding step to add moisture to the atomizing mold so as to adjust the moisture of the atomizing mold selected at the particle size selecting step to an appropriate amount have.

The coking coal providing step may provide the coking coal having a particle size of 5 mm or less and 90% of the particle size to the mixing step.

The binder may be one or more binders selected from the group consisting of bitumen, starch, molasses, water glass, pitch, polymer resin and the like.

The curing agent may be one or more curing agents selected from the group consisting of lime, slaked lime, limestone, calcium carbonate, limestone, cement, bentonite, clay, silica, silicate, dolomite, phosphoric acid, sulfuric acid and oxides.

The blasted coal having a size of 10 mm or more selected in the particle size selection step may be charged into the melter-gasifier.

The briquettes produced in the second briquette production step may be supplied to the briquette storage stage.

The particle size of the atomized-type coal may be 3 mm or more and 20% or more, and the average particle size may be 1 to 30 mm.

The density of the atomization-molded carbon may be 0.9 to 1.6 g / cm ³ .

The boiled coal may be supplied with moisture from the water adding device, and the appropriate moisture may be adjusted to 3 to 10%.

According to an embodiment of the present invention, there is provided a coking vessel storage bin for storing coking coal having a predetermined size,

A binder supply device for supplying a binder to be mixed with the coke,

A curing agent supply device for supplying a curing agent to be mixed with the coke,

A mixing device for mixing the coke supplied from the coke bins, the binder supplied from the binder supply device and the curing agent supplied from the curing agent supply device,

A first molding machine for forming a blended carbon blended with the cyanogen, the binder and the curing agent by the mixing device,

A particle size sorter for sorting the briquettes having a particle size of 10 mm or more and the briquetted particles having a particle size of 10 mm or less among the briquettes produced by the first molding machine,

And a second molding machine for molding the molded minute bins selected by the particle size separator to produce bins.

And a blanket storage bin provided between the first molding machine and the particle size separator to store the blanks produced in the first molding machine and supply the blanks to the particle sizer.

And a water addition device provided between the particle size separator and the second molding machine for adding moisture to the atomizing blender so that the moisture of the blended molding powder selected by the particle size selector can be controlled to an appropriate amount.

The coke bins having a particle size of 5 mm or less may be stored in the coke bins.

The binder may be one or more binders selected from the group consisting of bitumen, starch, molasses, water glass, pitch, polymer resin and the like.

The curing agent may be one or more curing agents selected from the group consisting of lime, slaked lime, limestone, calcium carbonate, limestone, cement, bentonite, clay, silica, silicate, dolomite, phosphoric acid, sulfuric acid and oxides.

The shaped coal having a size of 10 mm or more selected by the particle size separator can be charged into the melter-gasifier.

The briquettes produced by the second molding machine may be supplied to the briquette storage bin.

The particle size of the atomized-type coal may be 3 mm or more and 20% or more, and the average particle size may be 1 to 30 mm.

The density of the atomization-molded carbon may be 0.9 to 1.6 g / cm ³ .

The boiled coal may be supplied with moisture from the water adding device, and the appropriate moisture may be adjusted to 3 to 10%.

According to the embodiment of the present invention, it is possible to reduce the economic burden of equipment operation and maintenance required for transportation in order to reuse the blast furnace generated in the storage process after the production of the briquette, and as a result, facilities can be simplified and investment cost can be reduced.

In addition, since the blended-form coal is not used in combination with the raw coal, it is possible to reduce the quality variation of the blast-furnace due to particle size and moisture variation of the blended-form blended coal, and directly form at the place where the blended- As additional production of the briquettes, the production per unit time is increased, and the overall efficiency of the briquette production process can be increased.

FIG. 1 is a graph showing changes in apparent density of the briquette according to compressive strength.
2 is a schematic block diagram of a method of manufacturing a shaped coal according to an embodiment of the present invention.
FIG. 3 is a schematic configuration diagram of an apparatus for producing a molded coal according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention. As will be readily understood by those skilled in the art, the following embodiments may be modified in various ways within the scope and spirit of the present invention. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

(Principle of Solving the Problem of the Present Invention)

Blown briquettes generated during the briquette production process are mainly composed of low quality briquette formed at the beginning of the briquette process and briquetted briquettes generated at the non-forming area other than the briquette generated at the briquette forming process. Since the rate of forming after the molding is about 80% or more, the water content of the blow molded coal is about 1 to 10%, and the particle size is more than 20% of 3 mm or more and the average particle size is about 1 to 30 mm. The density of the minute-blasted coal is 1.0 ~ 1.6g / cm ^{3, which} is lower than that of the normal blasted coal but higher than that before the molding. If the minute briquetted carbon is directly molded, the quality of the briquette due to the molding instability is deteriorated, which is a problem in usability. In order to secure the cold strength by directly molding the minute molded carbon, it is possible to secure the quality when it is directly molded by adjusting to the appropriate moisture. This is because the density of the blast-shaped coal has undergone the primary molding process, and since it is re-molded, the density can be increased compared to the conventional blast furnace.

FIG. 1 is a graph showing changes in apparent density of the briquette according to compressive strength. The compressive strength of the briquette is greatly affected by the density. Compressive strength increases with increasing density at the same binder and curing agent usage conditions.

The method according to the present invention increases the production capacity of the blast furnace and simplifies the re-use process of the blast furnace to improve the efficiency of the blast furnace manufacturing process by directly molding the blast furnace generated in the storage process after the molding process, To increase.

2 is a schematic block diagram of a method of manufacturing a shaped coal according to an embodiment of the present invention.

Referring to FIG. 2, the method for producing molded coal according to an embodiment of the present invention includes a step (S10) of supplying coking coal having a predetermined size of coking coal,

A binder and a curing agent for providing a binder and a curing agent to be mixed with the coke,

A mixing step (S30) of mixing the cyanogen provided in the cyanogen providing step (S10) with the binder and the curing agent provided in the curing agent providing step (S20)

(S40) for forming a blended carbon by mixing the raw cyanide, the binder and the curing agent in the mixing step (S30)

A size sorting step (S60) for sorting the shaped coal having a particle size of 10 mm or more and the minute-shaped coal having a particle size of 10 mm or less among the formed coals produced in the step (S40)

And a second molding step (S80) for supplying the selected minute molding bins in the size selection step (S60) and molding the minute molding bins to produce the bins.

(S60), which is provided between the first molding step (S40) and the particle size selection step (S60), stores the molding bins manufactured in the first molding step (S40) Step S50.

The method of the present invention is characterized in that water is added to the blooming coal so as to adjust the moisture of the blooming coal selected in the particle size sorting step (S60) to an appropriate amount, provided between the particle size sorting step (S60) And a water addition step (S70).

The coking furnace providing step (S10) may provide the coking coal having a particle size of 5 mm or less to 90% of the coking coal to the mixing step (S40).

The binder may be one or more binders selected from the group consisting of bitumen, starch, molasses, water glass, pitch, polymer resin and the like.

The curing agent may be one or more curing agents selected from the group consisting of lime, slaked lime, limestone, calcium carbonate, limestone, cement, bentonite, clay, silica, silicate, dolomite, phosphoric acid, sulfuric acid and oxides.

The binder and the curing agent-providing step (S20) may include a binder in the mixing step (S30). 1 to 15% can be supplied in a fixed amount, and a hardening agent can be supplied in a fixed amount.

In the mixing step S30, mixed carbon in which cyanide, a binder, and a hardening agent are mixed is supplied to the first molding step S40, and the first molding step S40 is performed to mold the mixed carbon, do. The briquettes produced in the first briquette forming step S40 may be supplied to and stored in the briquette storing step S50.

The blanks of 10 mm or more selected in the particle size sorting step (S60) can be charged into the melter-gasifier (10).

The bins produced in the second bins forming step S80 may be supplied to the bosses storing step S50.

In addition, the water content of the ballasted coal may be 1 to 10%, and the particle size may be 3 to 20%, and the average particle size may be 1 to 30 mm. The density of the atomization-molded carbon may be 0.9 to 1.6 g / cm ³ . The boiled coal is supplied with water from the water addition step (S70), and the appropriate moisture can be adjusted to 3 to 10%

FIG. 3 is a schematic configuration diagram of an apparatus for producing a molded coal according to an embodiment of the present invention.

Referring to FIG. 3, the apparatus for producing molded coal according to an embodiment of the present invention includes a coke brewing bin 1 for storing coking coal having a predetermined size,

A binder supply device (2) for supplying a binder to be mixed with the coke,

A curing agent supply device (3) for supplying a curing agent to be mixed with the coke,

A mixing device (4) for mixing the coke supplied from the coke bins, the binder supplied from the binder supply device and the curing agent supplied from the curing agent supply device,

A first molding machine (5) for molding the mixed carbon mixed with the cyanogen, the binder and the curing agent by the mixing device to produce the molded carbon,

A particle size separator (7) for selecting a briquette having a particle size of 10 mm or more and a briquetted particle having a particle size of 10 mm or less among the briquettes produced by the first molding machine, and

And a second molding machine (9) for molding the selected minute molded carbon by the particle size separator (7) to produce a molded carbon.

And a blanket storage bin 6 provided between the first molding machine 5 and the particle size separator 7 for storing the blanks produced in the first molding machine 5 and supplying the blanks to the particle size separator 7 can do.

In addition, water is added to the bean-shaped coal so as to adjust the moisture of the bean-shaped coal selected by the particle size separator 7 to an appropriate amount, provided between the particle size separator 7 and the second molding machine 9 And a water addition device 8 for the water.

The coke oven storage bin 1 may store coke of 5 mm or less in particle size of 90%.

The binder may be one or more binders selected from the group consisting of bitumen, starch, molasses, water glass, pitch, polymer resin and the like.

The binder supply device (2) feeds the binder to the mixing device (4) in the order of wt. 1 ~ 15% can be supplied in a fixed quantity.

The curing agent may be one or more curing agents selected from the group consisting of lime, slaked lime, limestone, calcium carbonate, limestone, cement, bentonite, clay, silica, silicate, dolomite, phosphoric acid, sulfuric acid and oxides.

The curing agent supply device 3 may supply the curing agent to the mixing device 4 in a fixed amount.

The mixed carbon in which the coke, the binder and the curing agent are mixed is supplied to the first molding machine 5, and the first molding machine 5 molds the mixed carbon to produce the molded carbon. The briquettes produced in the first molding machine 5 may be stored in the briquette storage bin 6.

The molded gas of 10 mm or more selected by the particle size separator 7 can be charged into the melter-gasifier 10.

The second molding machine 9 is connected to the molding bins 6 and the bins produced by the second molding machine 9 can be supplied to the bins 6.

In addition, the amount of generated low-quality briquette among the briquettes produced from the first molding machine 5 and the briquette-shaped briquettes of 10 mm or less, which are generated due to the dropping impact between the briquettes in the briquette storage bin 6 and the internal- May be 5 to 20% of the amount of molded car- bon produced in the molding machine 5.

The water content of the blow molded coal is 1 to 10%, and the particle size may be not less than 3 mm and not less than 20%, and the average particle size may be 1 to 30 mm. The density of the blow molded carbon may be 0.9 to 1.6 g / cm < ³ >. The minute blast furnace is supplied with water from the water adding device 8 and the appropriate moisture can be adjusted to 3 to 10%. The amount of the blast furnace produced in the second molding machine 9 for molding the minute blended carbon having an appropriate moisture can be 95 to 150% of the strength of the conventional blast furnace. The production capacity of the second molding machine 9 for molding the minute molding coal may be 5 to 30% of the production capacity of the second molding machine 5.

Hereinafter, with reference to Fig. 3, the operation of the apparatus for producing molded articles according to one embodiment of the present invention will be described.

The raw materials are supplied from the binder supply device 2 to the binders such as bitumen, starch, molasses, water glass, pitch, polymer resin and the like from the cement fire storage bin 1 storing the coke having a particle size of 90% One or more binders selected from the group consisting of wt. 1 to 15% of the curing agent is supplied in a predetermined amount and the curing agent is supplied from the curing agent supply device 3 in a quantity selected from the group consisting of lime, slaked lime, limestone, calcium carbonate, limestone, cement, bentonite, clay, silica, silicate, dolomite, phosphoric acid, In the mixing device (4) in which one or more curing agents are supplied in a fixed amount, the coking agent, the binder and the curing agent are mixed.

In the mixing device 4, the mixed carbon mixed with the coke, the binder and the curing agent is supplied to the first molding machine 5, and the first molding machine 5 produces the blended carbon from the mixed carbon.

The briquettes produced in the first molding machine 5 are stored in the briquette storage bin 6 and the briquettes having a size of 10 mm or more in the particle size separator 7 before being loaded into the melter-gasifier 10 are charged into the melter- The blow molded coal having a diameter of 10 mm or less is supplied with water from the water addition device 8 and adjusted to the appropriate moisture and supplied to the second molding machine 9. The second molding machine 9 manufactures the blended molding with the blended molding, 2 The molding blanks produced in the molding machine 9 are supplied to the blanket storage bin 6.

Hereinafter, the present invention will be described in detail with reference to experimental examples.

(Experimental Example)

It was manufactured separately from the generally manufactured briquette and the characteristics of the briquette formed in the actual briquette production process.

At this time, the average particle size of the blow molded coal was adjusted to 4 mm and the moisture was adjusted to 6 wt%, 8 wt% and 10 wt%, respectively. The compressive strength was measured to evaluate the cold strength of the manufactured briquettes.

[Table 1]

As shown in Table 1, in the case of Experimental Example 1, the molding strength was increased from 66.8 kgf to 58.8 kgf by controlling the water content to 6% under the same condition of the particle size distribution of the powdered coal.

As shown in Experimental Example 2, when the water content was adjusted to 8%, the molding strength was increased to 92.2 kgf.

As shown in Experimental Example 3, when the water content was adjusted to 10%, the molded coal was found to have a compressive strength of 45.6 kgf, which is slightly smaller than that of the conventional molding granules.

1: Bin storage bin 2: Binder feeder
3: Curing agent supply device 4: Mixing device
5: First molding machine 6: Bottled storage bin
7: particle size selector 8: water addition device
9: Second molding machine 10: Melting-gasifier

Claims (22)

A coking furnace providing step of supplying a coking coal having a particle size of a predetermined size,
Providing a binder and a curing agent for providing a binder and a curing agent to be mixed with the coke,
A mixing step of mixing the cyanogen provided in the cyanogen providing step with the binder and the curing agent provided in the curing agent providing step with the binder,
A first molding step of molding the mixed carbon obtained by mixing the coke, the binder and the curing agent in the mixing step to produce a molded carbon,
A particle size sorting step for selecting the molded carbon particles having a particle size of 10 mm or more and the minute-shaped particles having a particle size of 10 mm or less among the molded products produced in the molded-
And a second blanket forming step for blanket-forming the blanket by receiving the blanger-shaped blanks selected in the step of selecting the blanket and producing blanket-
≪ / RTI > The method according to claim 1,
And a step of storing the briquettes, which are provided between the first briquette forming step and the briquetting step, and storing the briquetted briquettes produced in the first briquetting step, and supplying the briquette to the briquetting step. 3. The method according to claim 1 or 2,
And a water addition step provided between the particle size selecting step and the second molding step to add water to the atomizing mold so that the moisture of the atomizing mold selected in the particle size selecting step can be adjusted to an appropriate amount of moisture, Gt; The method of claim 3,
Wherein the coking coal providing step supplies coking coal having a particle size of 5 mm or less to 90% of the coking coal to the mixing step. 5. The method of claim 4,
Wherein the binder is one or more binders selected from the group consisting of bitumen, starch, molasses, water glass, pitch, and polymer resin. 6. The method of claim 5,
Wherein the curing agent is at least one curing agent selected from the group consisting of lime, slaked lime, limestone, calcium carbonate, limestone, cement, bentonite, clay, silica, silicate, dolomite, phosphoric acid, sulfuric acid and oxides. The method according to claim 6,
Wherein the briquettes having a size of 10 mm or more selected in the size selection step are charged into the melter-gasifier. The method of claim 3,
Wherein the briquettes produced in the second briquetting step are supplied to the briquette storing step. 5. The method of claim 4,
Wherein the particle size of the atomization-molded carbon is not less than 3 mm and not more than 20%, and the average particle size is 1 to 30 mm. 10. The method of claim 9,
Wherein the density of the minute-shaped carbon is 0.9 to 1.6 g / cm < ³ >. 11. The method of claim 10,
Wherein the fluidized-bed coal is supplied with water from the water-adding device and the appropriate moisture is adjusted to 3 to 10%. A coke storage bin storing coking coal having a predetermined size of granular coal,
A binder supply device for supplying a binder to be mixed with the coke,
A curing agent supply device for supplying a curing agent to be mixed with the coke,
A mixing device for mixing the coke supplied from the coke bins, the binder supplied from the binder supply device and the curing agent supplied from the curing agent supply device,
A first molding machine for forming a blended carbon blended with the cyanogen, the binder and the curing agent by the mixing device,
A particle size sorter for sorting the briquettes having a particle size of 10 mm or more and the briquetted particles having a particle size of 10 mm or less among the briquettes produced by the first molding machine,
And a second molding machine for molding the molded minute-shaped carbon selected by the particle size separator to produce a molded-
And a molding machine. 13. The method of claim 12,
And a blanket storage bin provided between the first molding machine and the particle size separator for storing the blanket produced in the first molding machine and supplying the blanket to the particle sizer. The method according to claim 12 or 13,
And a water addition device provided between the particle size separator and the second molding machine for adding moisture to the atomizing mold so that moisture of the minute molding compound selected by the particle size separator can be adjusted to an appropriate amount of moisture. 15. The method of claim 14,
Wherein the coking coal storing bin stores coking coal having a particle size of 5 mm or less at 90%. 16. The method of claim 15,
Wherein the binder is at least one binder selected from the group consisting of bitumen, starch, molasses, water glass, pitch, and polymer resin. 17. The method of claim 16,
Wherein the curing agent is at least one curing agent selected from the group consisting of lime, slaked lime, limestone, calcium carbonate, limestone, cement, bentonite, clay, silica, silicate, dolomite, phosphoric acid, sulfuric acid and oxides. 18. The method of claim 17,
The briquetting apparatus according to any one of claims 1 to 3, wherein the briquettes having a size of 10 mm or more selected by the particle size separator are charged in a melter-gasifier. 15. The method of claim 14,
Wherein the briquettes produced by the second molding machine are supplied to the briquette storage bin. 16. The method of claim 15,
Wherein the particle size of the atomization-molded carbon is not less than 3 mm and not more than 20%, and the average particle size is 1 to 30 mm. 21. The method of claim 20,
And the density of the minute-flow-shaped carbon is 0.9 to 1.6 g / cm ³ . 22. The method of claim 21,
Wherein the fluidized-bed coal is supplied with moisture from the water-adding device and has an appropriate moisture adjusted to 3 to 10%.

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