METHOD FOR OPERATING BLAST FURNACE USING SINTERED ORE EXCELLENT IN HIGH TEMPERATURE REDUCIBILITY

摘要

PROBLEM TO BE SOLVED: To provide a method for operating a blast furnace with which the ventilation in the furnace is improved by using sintered ore excellent in a high temperature reducibility and a large quantity of pulverized fine coals can be injected.;SOLUTION: In the method for operating the blast furnace, in which the injecting quantity of the pulverized fine coals is ≥150 kg/p-t, the sintered ore having 5-10 vol% porosity exceeding 50μm pore diameter and 5-15 vol% porosity at less than 5μm pore diameter in ≥70 mass% of iron oxide charging material charged from the furnace top, is used. As the above sintered ore, the sintered ore having 3.8-4.6 mass% content of SiO₂ component and 5-9 mass% content of FeO component, is desirable to use and further, the sintered ore which is sintered by using a sintering raw material blended at 25-80 mass% high crystallization water ore having ≥4 mass% ratio of the crystallization water content, is desirable to use.;COPYRIGHT: (C)2006,JPO&NCIPI