| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for pretreating molten iron for producing non- colored slag having low MnO concentration. SOLUTION: In the pretreating method for desiliconizing, dephophorizing and desulfurizing the molten iron, the Mn content in the molten iron to be subjected to the dephosphorizing treatment is adjusted to <=0.30 wt.%, and the dephosphorized slag produced when the desiliconization and dephosphorization treatments are performed by blowing oxygen is removed. Thereafter, when the desulfurizing treatment is performed by blowing a desulfurizing agent, the desulfurized slag having <=1.8 wt.% MnO content is produced by performing the desulfurization while keeping the slag basicity (CaO/SiO2) to >=3.0.
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