| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for directly producing a steel having extremely low carbon content, by reducing powdery raw material with carbon. SOLUTION: Dust 12 containing iron oxide is reduced to powder and supplied into a reducing furnace 32, and the dust 12 is melted with high temperature flame from a burner 14 vertically inserted into the reducing furnace 32. Further, coke (carbon) 22 as a reducing agent is reduced to powder and jetted toward the center part in the furnace from a jetting nozzle 26. The reduction of the iron oxide is performed while controlling, by using a controller 20, the supply ratio of the dust 12 and the coke 22 so that finish concentration of the iron oxide in the molten slag 52 in the furnace exceeds 5wt%. COPYRIGHT: (C)2007,JPO&INPIT
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