| 摘要 |
PURPOSE:To attain sufficient desiliconizing effect in a trough by injecting desiliconizing agent into deep position at a charging position for the desiliconizing agent except the head step and collectively removing desiliconized slag at the downstream side from the above injection position of the finish step. CONSTITUTION:By arranging a diving weir 5 in an molten iron trough 3 and an over-flow weir 6 in a slag trough 4, the molten iron surface flowing charging position of desiliconizing agent in the head step is made to removal condition of the blast furnace slag and in there, the desiliconizing agent is charged on the above surface from a hopper 11. The desiliconizing agent is entrapped in the molten iron flow and desiliconizing reaction having good efficiency is advanced. At the above charging positions on and after second step, the injection is executed into the deep part of the molten iron through a lance 12 inserted as penetrating the desiliconized slag layer by desiliconized agent charged at the position before it and desiliconizing efficiency on the after the second step is improved. And, the over-flow weir 6b in the molten slag trough 3, desiliconized slag trough 9 and dividing weir 5b are arranged at the downstream side from the above charging position of the finish step and the siliconized slag is collectively removed from the trough 9, and the molten iron dives the diving weir 5b and flows down to the downstream side, to receive into a molten iron ladle, etc.
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