| 摘要 |
PURPOSE:To permit the control of the Si content of the molten iron to be tapped from a blast furnace in blast furnace operation by incorporating part of the coke used at a prescribed coke ratio in the form of middle lump coke into an ore layer and controlling the incorporating ratio thereof. CONSTITUTION:Part of the amt. of the coke used in the blast furnace operation in which iron ore and lump coke are alternately charged at the prescribed coke ratio into the blast furnace is incorporated as 5-25mm middle lump coke into the ore layer and the balance is charged alternately with the ore in the laminar state into the blast furnace. The Si content in the molten iron to be tapped from the blast furnace can be adjusted as desired to the value approximate to a target value by controlling the ratio of the middle lump coke to be incorporated into the ore layer. The amt. of the middle lump coke to be incorporated into the ore is made 10-25% of the total amt. of the coke, by which the Si content in the molten iron to be tapped is made to value as low as 0.08-0.10%.
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