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Method of producing ashless coal

a technology of ashless coal and ash-free coal, which is applied in the production of liquid hydrocarbon mixtures, solid fuels, petroleum industry, etc., can solve the problems of insufficient caking coal resource and high cost of caking coal, and achieve the effects of low cost, high production efficiency and improved thermal plasticity of the resultant blended coal

Inactive Publication Date: 2010-01-14
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]According to a method of producing ashless coal of the present invention, ashless coal used in caking coal for coke for iron making can be produced with a high efficiency and at a low cost. When this ashless coal is blended with raw coal, thermal plasticity of the resulting blended coal can be increased, and the amount of expensive strongly caking coal blended can be reduced. Consequently, the cost of the raw coal for coke for iron making can be reduced. Furthermore, by improving the caking property of the blended coal, the strength of coke for iron making can also be improved. Furthermore, in addition to the ashless coal, residue coal can also be produced with a high efficiently and at a low cost.

Problems solved by technology

In addition, the amount of caking coal resource has been insufficient, and caking coal is expensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0090]In Example 1, in the case where an extraction temperature in an extraction step was 370° C., changes in thermal plasticity (softening fluidity), a resolidification temperature, and the like of raw coal samples and ashless coal samples obtained from the raw coal samples were examined (Experimental Example 1).

[0091]Strongly caking coal A, strongly caking coal B, and sub-bituminous coal C having industrial analysis values and elemental analysis values shown in Table 1 were used as raw coal samples. Five kilograms of each of the raw coal samples was mixed with 20 kg (fourfold) of a solvent (1-methylnaphthalene (produced by Nippon Steel Chemical Co., Ltd.) to prepare slurries. Extraction was performed by pressing each of the slurries with nitrogen at a pressure of 1.2 MPa in an autoclave having an internal volume of 30 L at 370° C. for one hour. Each of the slurries was separated into a supernatant and a solid-concentrated liquid in a gravity settling chamber in which the same temp...

example 2

[0101]In Example 2, the relationship between the extraction temperature when an extraction treatment of the sub-bituminous coal C used in Example 1 was performed and the resolidification temperature of the ashless coal c obtained from the sub-bituminous coal C was examined (Experimental Example 2).

[0102]FIG. 4 shows the relationship between the extraction temperature and the resolidification temperature of the prepared ashless coal c in the case where an extraction treatment was performed with an extraction time of one hour (60 minutes) using the sub-bituminous coal C was used as raw coal.

[0103]The method of producing ashless coal was performed in accordance with Example 1 except that the extraction temperature was changed.

[0104]As shown in FIG. 4, at extraction temperatures exceeding about 360° C., as the extraction temperature increased, the resolidification temperature of the ashless coal c increased. At an extraction temperature of 400° C., the resolidification temperature was a...

example 3

[0106]In Example 3, the relationships between the extraction temperature, the extraction time, and the extraction yield in the case where an extraction treatment of the sub-bituminous coal C used in Example 1 was performed were examined (Experimental Example 3).

[0107]FIG. 5 shows the relationship between the extraction time and the extraction yield in the case where the sub-bituminous coal C was heated to an extraction temperature of 370° C., 400° C., or 420° C. with a preheater, and kept in an extractor for a predetermined time, and then rapidly cooled to 360° C. to perform an extraction treatment. In the experiment at 420° C., the time required for increasing the temperature from 400° C. to 420° C. in the preheater was eight minutes. Accordingly, in FIG. 5, extraction times which also include the eight minutes, which corresponds to an extraction time from 400° C. to 420° C., in the preheater are shown.

[0108]The method of producing ashless coal was performed in accordance with Exam...

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Abstract

A method of producing ashless coal used in caking coal for coke for iron making includes a slurry preparation step (S1) of mixing a solvent with coal to prepare a slurry; an extraction step (S2) of extracting the slurry obtained in the slurry preparation step (S1) at a temperature in the range of 400° C. to 420° C. for 20 minutes or less, and then cooling the slurry to 370° C. or lower; a separation step (S3) of separating the slurry obtained in the extraction step (S2) into a liquid portion and a non-liquid portion; and an improved-coal-obtaining step (S4) of separating the solvent from the liquid portion separated in the separation step (S3) to obtain ashless coal which is improved coal.

Description

TECHNICAL FIELD[0001]The present invention relates to a method of producing ashless coal in which ashless coal used in caking coal for coke for iron making is produced from coal.BACKGROUND ART[0002]Hitherto, as caking coal for coke for iron making, such as blast furnace coke, blended coal containing high-rank caking coal as a main component, weakly caking coal, and non- or slightly caking coal has been used. Recently, an attempt has been made to extract a component soluble in a solvent from coal to obtain extracted coal having a quality higher than that of raw coal.[0003]For example, the following method has been disclosed (see, for example, Patent Document 1): Bituminous coal, sub-bituminous coal, brown coal, lignite, or the like is used as raw coal and mixed with liquefaction oil used as a solvent to prepare a slurry, the slurry is hydrogenated at a high temperature and a high pressure in the presence of a catalyst to liquefy the resulting product, and solvent refined coal (SRC) t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G1/04
CPCC10L9/10C10L9/02C10L5/06
Inventor OKUYAMA, NORIYUKITADA, NAOJIFURUYA, ATSUSHIKOMATSU, NOBUYUKI
Owner KOBE STEEL LTD
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