| 摘要 |
PROBLEM TO BE SOLVED: To provide a blending method of a blast furnace coke raw material, achieving both an increase in the particle diameter of coke and an increase in the coke strength.SOLUTION: In a blending method of a blast furnace coke raw material containing a non-slightly-caking coal having a re-solidification temperature by the Gieseler Plastometer method defined in JISM8801 of 470°C or less and a low shrinkage carbonaceous material having a shrinkage factor of 10.5% or less when heated from the re-solidification temperature to 1000°C, the blast furnace coke raw material is blended for satisfying following formulae (1) to (3). X mass%≥70 mass% (1) SV×BD≥1.2 (2) DI>DI(3), where X mass% is a blending ratio of the non-slightly-caking coal and the low shrinkage carbonaceous material and remaining is a caking coal, SV is an expansion ratio volume at coal softening, BD is a charge bulk density of coal at coke oven charging, DIis a coke strength of standard coke containing X mass% of the non-slightly-caking coal and no low shrinkage carbonaceous material, and DIis coke strength of the blast furnace coke containing low shrinkage carbonaceous material. |
