电子束熔炼去除冶金级硅中磷、铝、钙的研究

Investigation on the removal of phosphorus,aluminum,calcium from metallurgical grade silicon using electron beam melting

采用电子束熔炼方法提纯了冶金级硅材料。实验结果表明随熔炼时间延长,硅中挥发性杂质元素P、Al、Ca的含量逐渐降低。熔炼40min后,硅中P含量可以降至2.2×10-5%(质量分数);Al、Ca的最低含量为8.5×10-5%和1.5×10-4%(质量分数)。P、Al、Ca的挥发去除为一阶反应过程,反应速率常数分别为0.11、0.12和0.13min-1。

Behavior of phosphorus,aluminum and calcium in metallurgical grade silicon has been investigated during electron beam melting with melting time modified.The results showed that the content of phosphorus,aluminum and calcium gradually decreased with time passing,and the lowest content of these impurities were 2.2×10-5wt% P,8.5×10-5 wt% Al and 1.5×10-4 wt% Ca respectively.The removal rates of these elements were expressed by the first order equation.Rate constants for phosphorus,aluminum and calcium were 0.11,0.12,0.13min-1 respectively.