PURPOSE: To enable continuous operation without equipment trouble and to obtain an excellent low-Si operation efficiency at a decreased coke ratio and stable descending by mixing iron ore powder and heavy oil in a slurry state and blowing the same into a blast furnace through blast furnace tuyeress.
CONSTITUTION: The iron core powder stored in a service hopper 1 is fed out at a prescribed rate through a rotary feeder 2 provided to the lower part of the hopper 1 and is supplied to a mixing tank 3 where the iron ore powder is uniformly mixed with a prescribed amt. of the heavy oil from a heavy oil supply line 4. After the slurry composed of the iron ore powder and heavy oil to a prescribed concn. is prepd., the slurry is distributed and fed from the lower part of the tank 3 to the respective tuyeres 8 through a distributor 6 by a slurry pump 5 and is blown from slurry blow nozzles 7 into the blast furnace 9. The blowing of the iron ore powder from the tuyeres 8 without inducing piping wear is permitted and further, the execution of the long-period low-Si operation under the stable descending is permitted. The excellent effect of reducing the consumption of the slag forming agent in a steel making stage is obtd.
KAJIWARA YOSHIMASA
SUYAMA SHINICHI
| JPS60258403A | 1985-12-20 | |||
| JPS5387908A | 1978-08-02 |