Patent ID: 7645362

Claim:
A method for pretreating and improving metallurgical coal quality, wherein the metallurgical coal is a blended coal of non- or slightly-coking coals and strongly-coking coals, by heating, for producing blast furance coke comprising the steps of: (a) rapid-heating said metallurgical coal in a fluidized-bed to a temperature range between not lower than 250° C. and not higher than 300° C., at a rate of 30 to 150° C./min., (b) classifying the rapid-heated metallurgical coal to fine-size coal and coarse-size coal, (c) rapid-heating said fine-size and coarse-size coal individually in a pneumatic preheater to a temperature range between not lower than 300° C. and not higher than the temperature at which the metallurgical coal begins to soften, at a rate of 10 3 to 10 5 ° C/min., and (d) forming said fine-size coal.