PURPOSE: To reduce the content of Si of the molten iron to be subjected to dephosphorization treatment as far as possible by blowing a desiliconizer of iron oxide type together with a carrier gas into the molten iron through a lance inserted therein through a receiving port of a torpedo car in pretreatment of molten iron.
CONSTITUTION: After a torpedo car 1 is stopped in a prescribed position, a lance 2 is inserted through a receiving port 3, and is immersed to suitable depth in molten iron 10. Thence, a desiliconizer is blown together with gaseous N
2 or the like as a carrier gas into the molten iron 10 through the lance 2, whereby the molten iron is desiliconized. This desiliconizer is preferably the one of iron oxide type of 60W70% Fe
2 O
3 and 15W20% CaO. As a result, the content of Si in the molten iron 10 decreases considerably, the original unit of using the dephosphorizer in dephosphorization treatment is reduced, and the dephosphorization treatment and further the converter refining of post stage are accomplished surely.
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