以冶金级Si和电解Cu为原料,制备了Cu-31Si(摩尔分数,％)合金.以Cu-31Si合金为阳极、Mo为阴极和参比电极,采用循环伏安和计时电位方法研究了1173 K下熔盐81CaCl2-8.0NaCl-8.5CaO-2.5Si(摩尔分数,％)的阴极行为,讨论了熔盐中Si电解精炼过程的还原步骤.用SEM,EDS和电感耦合等离子原子发射光谱仪(ICPAES)分析和表征了Si晶体的形貌和组成.电解精炼后得到了多晶Si,与冶金Si原料相比,主要杂质含量都显著降低,特别是对太阳能级Si危害较大的杂质B和P去除效果明显,分别从42×10-6和25×10-6降至4.5×10-6和8.2×10-6.电解精炼过程的电流效率为84.4％.
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