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Research on Impurities Distribution Characteristics and Its Selective Separation by Acid Leaching

Abstract

湿法提纯可以有效的选择性去除硅中的有害杂质,是冶金法制备太阳能级多晶硅的典型技术,具有设备简单、可规模化操作,能耗低,对大多数金属杂质元素去除效果好等优点。 基于硅中杂质赋存分布特性的系统分析,研究了酸浸工艺对杂质选择性分离的影响规律,并优化酸浸工艺。主要结果如下: 1、工业硅中杂质主要以颗粒团和杂质带的形式存在,其中主要化合物相是Si-Fe相和Si-Fe-Al相,还有部分Si-Fe-Al-M(Ca/Mn/Ti/Ni)相、Fe-Si-M(Ti/Mn)相和Al-Si-V-Mn相。HF酸对化合物相的腐蚀效果较HCl酸和HNO3酸更好,Si-Fe相、Si-Fe-Mn相和Si-Fe-Al-Mn相不...As a tipical technology of metallurgical method for solar grade silicon fabrication, acid leaching can remove the harmful impurities, especially most of the metal impurity elements in silicon efficiency with simple equipment, scale operation and low energy consumption. Based on the system analysis of the impurities distribution characteristics in silicon, the influence of acid leaching process...学位:工学硕士院系专业:材料学院材料科学与工程系_材料学学号:2072009115005

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