铝硅熔体超重力凝固提纯硅(英文)

研究超重力场下铝硅过共晶熔体凝固精炼提纯冶金硅。实验结果表明:超重力作为一种强化分离手段,可以实现铝硅合金中初晶硅颗粒的富集分离。在超重力作用下,铝硅合金中精炼硅颗粒沿超重力方向富集在铝硅合金下部。用王水溶解其中的铝,得到初晶硅颗粒。通过分析初晶硅中杂质含量可知,与冶金硅原样相比,精炼后的硅纯度由99.59%提高到99.92%,硼和磷的质量分数分别由8.33×10-6和33.65×10-6降低到5.25×10-6和13.50×10-6,表明该提纯方法可行。

Si purification by solidification of Al-Si melt with super gravity

The investigation on purification of metallurgical grade silicon by solidification of hypereutectic Al-Si melt with super gravity as an intensified separation way was carried out.The results indicate that the refined silicon grains are successfully enriched at the bottom of the Al-Si alloy along the direction of super gravity.Then the refined silicon was collected by aqua regia leaching.The purity of the collected silicon is analyzed as 99.92%,which is obviously improved compared with the purity of the metallurgical grade silicon of 99.59%,proving the feasibility of this purification method.Furthermore,the mass fraction of B is reduced from 8.33×10-6 to 5.25×10-6 and that of P from 33.65×10-6 to13.50×10-6.