Effect of Lepidolite on Dephosphorization of CaO-FeO-CaF₂ Slags in the Hot Metal Pretreatment

At 1 340~1 360℃ under laboratory conditions,the research on the dephosphorization of the CaO-FeO-CaF₂ slags additive lepidolite in hot metal pretreatment has been completed.Influences of lepidolite additive quantity on the slag melting point and dephosphorization effects have been researched.The results show that with lepidolite content increasing,the melting point of CaO-FeO-CaF 2 slags decreases;at 1 340~1 360℃,the silicon content is controlled at 0.01% in the molten iron,and when w_CaO/w_FeO=1.29,adding 10% lepidolite to the hot metal,the phosphorus content can be down to 0.005%;In the conditions of 2% fluorite and 10% lepidolite,when w_{(CaO+lepidolite)}/w_FeO in the range of 1.83~1.86,the dephosphorization rate of molten iron can be maintained at 95%.