| 摘要 |
PROBLEM TO BE SOLVED: To provide a blast furnace operating method where, even under an operation of blowing a large amount of dust coal, air permeability, liquid permeability and reducing conditions can be held in satisfactory states, and an economical and stable blast furnace operation is made possible. SOLUTION: In the blast furnace operating method where, as a solid reducing material and an iron raw material are charged from a furnace tip 11 of a blast furnace 10, dust coal is blown in from a tuyere 12 of the blast furnace 10 together with a hot blast, a lumpy ore-containing treatment raw material is subjected to heating treatment and is dried, and before the dried treatment raw material is charged from the furnace tip 11 to the blast furnace 10 as an iron raw material, sieve sorting treatment is performed, and pulverized ore stuck to the treatment raw material is removed. COPYRIGHT: (C)2007,JPO&INPIT
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