METHOD FOR DECIDING BLENDING AMOUNT OF ASH-FREE COAL, AND METHOD FOR PRODUCING COKE FOR BLAST FURNACE

摘要

PROBLEM TO BE SOLVED: To provide: an efficient method for deciding a blending amount of ash-free coal when producing a coke for blast furnaces; and a method for producing a coke for blast furnaces using the decision method.SOLUTION: This invention relates to a method for deciding a blending amount of ash-free coal obtained by solvent extraction of coal, when producing a coke for blast furnaces which comprises feed coal and the ash-free coal. The method comprises: deciding the blending amount of the ash-free coal with respect to the blend coal on the basis of the reference value W [mass%], wherein the reference value W is calculated by using the porosity index Pv [vol%] of the feed coal, the expansibility index D [vol%] of the ash-free coal, and the true specific gravity ρ of the ash-free coal through the following equation (1): W=(Pv/D)×ρ×100. The blending amount of the ash-free coal with respect to the blend coal is preferably 0.29 W to 1.00 W [mass%].SELECTED DRAWING: None