| 摘要 |
PROBLEM TO BE SOLVED: To provide an operation method capable of performing a high ore/reducing material ratio operation stably over a long period of time. SOLUTION: In the operation method at a high ore/reducing material ratio in a blast furnace, in an operation method of a blast furnace where sintered ore obtained by sintering a blended raw material obtained by mixing an auxiliary raw material comprising SiO<SB>2</SB>, MgO and CaO alone or in combination and a reducing material into the main raw material essentially consisting of iron ore is charged to a blast furnace at a prescribed high ore/reducing material ratio, and dust coal is blown therein together with a hot blast from a blast furnace tuyere to produce pig iron, the blending ratio of the auxiliary raw material is regulated in accordance with the level of the amount of Al<SB>2</SB>O<SB>3</SB>in the sintered ore to be ordinarily used, so as to produce the sintered ore having high strength and high reducibility, further, the auxiliary raw material by an amount equal to the difference in the blending ratio between the sintered ore having high strength and high reducibility produced by the regulation and the sintered ore to be ordinarily used is blown from the blast furnace tuyere. COPYRIGHT: (C)2006,JPO&NCIPI
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