| 摘要 |
PROBLEM TO BE SOLVED: To directly use reduced iron pellet produced by a rotary furnace hearth method, in a blast furnace. SOLUTION: When the reduced iron pellet is produced by executing reduction treatment to the pellet granulating mixed raw material of carbonaceous material and iron oxide in the rotary hearth type sintering reduction furnace, the reduction treatment is executed to the raw material containing 45-65% iron content wt. ratio so that the carbon weight ratio is in the range of 0.45-0.80 of the oxygen wt. ratio existing as the iron oxide and the reaction temp. is the arbitrary temp. of 1,200-1,400 deg.C. Then, the reduced iron pellet is produced by executing the reduction treatment to the pellet granulated by using the iron content and the carbon-containing dust generated in the steelmaking process as the mixed raw material.
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