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在氟化物熔盐电解质体系下,把Cu与冶金级多晶硅熔配成合金作为阳极硅源,利用杂质与硅析出电位的差别,通过控制电解工艺条件和参数,对冶金硅进行了电解精炼提纯研究。结果表明:电解过程平稳,且电流效率保持95%以上;阴极电沉积硅呈颗粒状,尺寸约为100μm;随着电解时间的延长,分散的硅的颗粒有聚集成大尺寸硅球的趋势。ICP-AES分析表明,最后得到的产物硅与冶金级硅相比,硼含量由12.7mg/kg降低到2.4mg/kg,磷含量由98.6mg/kg减少到4.3mg/kg。
In the fluoride molten salt electrolyte system, the Cu and metallurgical grade polycrystalline silicon melt alloyed as the anode silicon source, the use of impurities and silicon precipitation potential difference, by controlling the electrolysis process conditions and parameters of the metallurgical silicon was refined by electrolytic refining . The results showed that the electrolysis process was stable and the current efficiency was maintained above 95%. The cathodic electrodeposited silicon was granular with a size of about 100 μm. With the extension of electrolysis time, the dispersed silicon particles aggregated into large-size silicon spheres. ICP-AES analysis showed that the final product, Si, reduced the boron content from 12.7 mg / kg to 2.4 mg / kg and the phosphorus content from 98.6 mg / kg to 4.3 mg / kg compared to metallurgical grade silicon.