Abstract: In order to decrease the CaF2 content in dephosphorization slag (40CaO, 52Fe₂O₃ , 6 - 8CaF₂ ) for hot metal pretreatment, the CaF₂ in pretreatment dephosphorization slag was replaced respectively by 2% 〜8% Al₂O₃, B₂O₃, Li₂O and dolomite to study dephosphorization effect after replace. Test results at 1 450 °C showed that Al₂O₃, B₂O₃ , Li₂O and dolomite might be used instead of CaF₂ to form low fluoride or free fluoride slag for hot metal pretreatment. With replacing CaF₂, by Al₂O₃ or Li₂O, the dephosphorization effect of pretreatment of slag improved and with replacing CaF₂ by B₂O₃ or dolomite the dephosphorization effect of slag was about equal to that of fluoride slag.

Key words: Low Fluoride Slag, Hot Metal Pretreatment, Dephosphorization

摘要： 为了降低预处理脱磷渣(%:40CaO、52Fe₂O₃、6～8CaF₂)中CaF2含量,分别用2%～8%Al₂O₃、B₂O₃、Li₂O和白云石替代预处理脱磷渣中CaF2,研究替代后脱磷效果。在1450℃的实验结果表明,Al₂O₃、B₂O₃、Li₂O和白云石都能替代CaF₂,形成低氟或无氟预处理渣。Al₂O₃和Li₂O替代CaF₂后预处理脱磷率提高,而B₂O₃和白云石替代前后预处理效果相当。

关键词: 低氟渣, 铁水预处理, 脱磷