| 摘要 |
PURPOSE:To obtain a high effect of a low-Si operation under stable descending while preventing the wear of pipings and decreasing a coke ratio by blowing a slurry prepd. by mixing iron ore powder and tar into a blast furnace from the tuyeres thereof. CONSTITUTION:The iron ore powder stored in a service hopper 1 is fed therefrom at a prescribed rate via a rotary feeder 2 and is supplied into a mixing tank 4. The iron ore powder is uniformly mixed with the tar supplied form a tar supply line 3 and is prepd. to iron ore powder-tar slurry of a prescribed concn. The above-mentioned slurry is distributed and fed by a slurry pump 5 via a distributor 6 to the respective blast furnace tuyeres 8 and is blown via blow nozzles 7 provided on the respective tuyeres 8 into the blast furnace 9. The iron core powder is thereby blown into the blast furnace from the tuyeres 8 without requiring powder drying and without wear of the piping. The concn. of Si in the molten iron in the blast furnace 9 is thus reduced under stable settling while the coke ratio is decreased. |
