| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing coal fuel molding capable of lowering characteristic water content and suppressing collapse of shape and spontaneous ignition. SOLUTION: Low-grade coal is ground into <=1000×m particle diameter by a wet type grinder 14 to afford ground coal, and water in slurry containing the ground coal is heated through a preheater 21 and a heater 22 to over-heated water of >=270 deg.C and the slurry is subjected to hot water treatment at the same temperature for >=5min to convert the ground coat into modified coal. Then, the modified coal is separated by a dehydrator 31 and dried by a drier 32 and compressed under 2 ton/cm<2> pressure by a molding machine 42 to afford a coal fuel molding. Since pores of raw coal are made to collapse and characteristic water content as well as hygroscopic property are lowered by modification, a molding obtained from the modified coal has characteristic low water content and hardly causes collapse of shape and since the specific surface area of the molding is small, the molding hardly causes spontaneous ignition.
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