A combination of slag and solvent refining methods was used to remove phosphorus from silicon. The CaO-Al₂O₃-SiO₂-Na₂O quaternary system was selected as the slag to eliminate phosphorus from Si-20 wt.% Fe alloy at 1300°C. The partition ratio of phosphorus (L_P) at various slag compositions was obtained to investigate the effect of basicity (CaO/SiO₂), oxygen potential (SiO₂/Al₂O₃) and Na₂O content of the slag. The maximum value for L_P was 1.19 at CaO/SiO₂ of 1.36, SiO₂/Al₂O₃ of 1.56 and the addition of 10 wt.% of Na₂O. The critical partial pressure of oxygen for maximum phosphorus removal was estimated at 1.8 × 10⁻²² atm. The normalized distribution and phosphate capacity were evaluated to clarify the effect of basicity. Corrected optical basicity and NBO/T were determined to consider the effect of the cations in the complex silicate structures and investigate the effect of the degree of depolymerization on the efficiency of phosphorus removal from silicon.

炉渣和溶剂精制方法的组合用于从硅中去除磷。选择CaO-Al ₂ O ₃ -SiO ₂ -Na ₂ O四元系作为炉渣，以在1300℃下从Si-20％（重量）的Fe合金中除去磷。获得了不同炉渣组成下磷（L _P）的分配比，以研究碱度（CaO / SiO ₂），氧势（SiO ₂ / Al ₂ O ₃）和Na ₂ O含量的影响。CaO / SiO ₂为1.36，SiO ₂ / Al时L _P的最大值为1.19₂ Ó ₃的1.56和加入的Na 10％（重量）₂ O.氧的最大除磷临界局部压力估计为1.8×10 ^-22大气压。对归一化的分布和磷酸盐容量进行了评估，以澄清碱性的影响。确定校正后的光学碱度和NBO / T，以考虑阳离子在复杂硅酸盐结构中的影响，并研究解聚度对脱磷效率的影响。