METHOD FOR DEPHOSPHORIZING MOLTEN IRON DEVELOPING LITTLE SLAG QUANTITY

摘要

PROBLEM TO BE SOLVED: To provide a method for dephosphorizing molten iron developing little slag quantity by which total slag quantity developed in a steelmaking process, is reduced and the wearing of a refractory is restrained and also, the reached phosphorus concentration can sufficiently be reduced in a short time. SOLUTION: The method for removing the phosphorus contained in molten iron comprises a primary dephosphorizing treatment for performing the dephosphorization until the phosphorus concentration reaches 0.04-0.06 wt.% by reutilizing discharged slag as dephosphorizing flux, and a secondary dephosphorizing treatment for performing the dephosphorization by adding the dephosphorizing flux, such as lime, decarburized slag, into the molten iron after discharging the slag developed in the primary dephosphorizing treatment.