The effect of alumina crucible on different aspects of the solvent refining of silicon by the Si-Ca-Fe system was investigated in this paper. Ca and Fe were added to Si in a wide range of concentrations (0–20 wt%), and the melt composition change resulting from melt-alumina interactions was studied thermodynamically and experimentally. The ratio of Ca concentration in the final melt to its value in the initial mixture was in the range of 0.17–0.23. On the other hand, a considerable amount of Al was identified in the melt together with CaAl₄O₇, Ca₂Al₂SiO₇, and CaAl₂O₄ phases as oxide interaction products. A conceptual mechanism was proposed for the evolution of these products. Then, the segregation behavior of impurities during solidification was studied based on Fe or Ca increment in the system, and B and P removal rates were calculated in particular. The higher the Ca or Fe content were, the higher removal rates were achieved. They were also enhanced by cooling the samples in the furnace rather than quenching from 1493 K (1220 °C). The directional solidification method was also examined, and it showed the best overall removal rate with 94.9% for P and 63% for B, while its impact on B reduction was more than P.

本文研究了氧化铝坩埚对Si-Ca-Fe体系硅精炼溶剂不同方面的影响。Ca和Fe以很宽的浓度范围（0–20 wt％）添加到Si中，并且通过热力学和实验研究了由熔体与氧化铝相互作用引起的熔体组成变化。最终熔体中的Ca浓度与初始混合物中的Ca值之比在0.17–0.23的范围内。另一方面，在熔体中发现大量的Al以及CaAl ₄ O ₇，Ca ₂ Al ₂ SiO ₇和CaAl ₂ O _4。相作为氧化物相互作用的产物。为这些产品的发展提出了一种概念机制。然后，根据体系中Fe或Ca的增加量，研究了凝固过程中杂质的偏析行为，特别是计算了B和P的去除率。Ca或Fe含量越高，去除率越高。通过在炉中冷却样品，而不是从1493 K（1220°C）淬火，也可以增强它们。还检查了定向凝固方法，该方法显示出最佳的整体去除率，P的去除率为94.9％，B的去除率为63％，而其对B减少的影响大于P。