METHOD FOR CHARGING HARD-TO-REDUCE ORE INTO BLAST FURNACE

摘要

PURPOSE:To suppress an increase in fuel ratio even if the substitution rate to substitute a hard-to-reduce ore with a sintered ore is increased by charging the hard-to-reduce ore into the central part of a blast furnace. CONSTITUTION:The hard-to-reduce ore having =30% reducibility is charged into the central part of the blast furnace for the hard-to-reduce ore in the method for charging the above-mentioned hard-to-reduce ore into the blast furnace. The range where the hard-to-reduce ore is charged may be confined to 3/4 of the in-furnace radius of the stock line. The increase in fuel ratio is effectively prevented and, therefore, a good result is obtd. if the hard-to-reduce ore is substituted with the sintered ore and is charged into the central part of the blast furnace and the substitution rate thereof is confined to =20%.