Patent ID: 7766985

Claim:
A method for aging reformed coal produced by heating medium-quality or low-quality coal to a temperature of 180 to less than 300° C. and then cooling it to a temperature of 150° C. or below or by heating medium-quality or low-quality coal to a temperature of 300 to 500° C. at a heating rate of not less than 100° C. per minute and then cooling it to a temperature of 250° C. or below at a cooling rate of not less than 50° C. per minute, which comprises storing the reformed coal for 1 month or more under any of the following atmospheres (a) or (b): (a) An atmosphere having an oxygen concentration of not greater than 12% by volume and a temperature of 100° C. or below; (b) An atmosphere having an oxygen concentration of not greater than 21% by volume and a temperature of 70° C. or below.