METHOD FOR OPERATING BLAST FURNACE BY SELECTIVELY PRODUCING SINTERED ORE

摘要

PROBLEM TO BE SOLVED: To achieve the reduction of fuel ratio and the improvement of productivity by securing permeability and reducibility in a cohesion zone formed of sintered ores when a large quantity of pulverized coals are blown, increasing an O/C(one-to-coke ratio) at the peripheral part of a furnace and improving the reducing efficiency in this zone.;SOLUTION: Two kinds of sintered ores are produced and their chemical compositions (CaO/SiO2, SiO2, Al2O3, MgO) are regulated within an appropriate range. Two kinds of sintered ores are pre-mixed and charged, or separately charged alternately with cokes from a furnace top part. The sintered ores are produced by using two sintering machines, or using single sintering machine bisected in its width or height direction.;COPYRIGHT: (C)2002,JPO