Method of preliminary desiliconization of molten iron by injecting gaseous oxygen
AssigneeNippon Steel Corporation
InventorsShingo Satoh, Takashi Inoue, Minoru Naki, Yuji Kawauchi
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Abstract
The present invention provides a method for preliminary treatment of molten iron from a blast furnace wherein only desiliconization of the iron is effected. Gaseous oxygen is injected into the molten iron by controlling its supply rate depending on the Si content of the molten iron in such a manner that said rate is increased if the Si content of the iron is high and decreased if the Si content is low.
Claims11
A method of preferential desiliconization of molten iron by injecting gaseous oxygen wherein the gaseous oxygen is injected into the molten iron at controlled a rate depending upon the silicon content of the molten iron so as to satisfy the formula (I):
- 0.03.ltoreq.V.sub.O.sbsb.2 .ltoreq.1.25 [%Si]-0.075 (I)
- wherein V.sub.O.sbsb.2 :
- the rate of gaseous oxygen feed Nm.sup.3 /min/ton pig,) and [%Si]:
- Si content of the molten iron (%).
Dependencies are inferred from the claim text.