转炉冶炼CaO-SiO_2-FeO渣系中磷的行为

Phosphorus behavior in CaO-SiO_2-FeO slag during converter melting process

回归推导出渣系中磷酸盐容量对数与炉渣光学碱度和温度的关系表达式,通过回归公式绘制出CaO-SiO2-FeO(10%MgO)渣系的等磷酸盐容量图,分析了转炉终渣、终点成分及温度对钢中磷含量的影响情况.当熔渣磷酸盐容量一定时,随着转炉终点碳含量降低,渣/钢间磷分配比增加;相同终点碳含量时,随着熔渣磷酸盐容量增加,渣/钢间磷分配比增加;转炉终点碳质量分数控制在0.03%～0.04%,炉渣碱度大于3.5,渣中FeO质量分数低于18%,渣中P2O5质量分数低于2%,有利于获得终点磷质量分数在0.008%以内的钢水.

An expression was regressed to describe the relation of phosphate capacity in slag to slag＇s optical basicity and temperature. An iso-phosphate capacity graph of the CaO-SiO2-FeO （10% MgO） slag system was depicted by the regression expression. The effect of converter end-point slag, end-point composition and temperature on the phosphorus content in steel was analyzed. When the phosphate capacity in slag is constant, the distribution ratio of phosphorus between slag and steel increases with the converter final carbon content decreasing; but at a constant final carbon content, with the increase of phosphate capacity in slag, the distribution ratio of phosphorus between slag and steel increases. It is suggested that the final carbon content is controlled between 0.03% and 0.04%, the slag basicity is more than 3.5, the FeO content in slag is less than 18%, and the P205 content in slag is less than 2%, which are favorable for producing liquid steel with the final phosphorus content less than 0.008%.