Solar-grade silicon powder prepared by combining combustion synthesis with hydrometallurgy
Solar-grade silicon powder prepared by combining combustion synthesis with hydrometallurgy
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DOI：
10.1016/j.solmat.2010.10.016
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发表时间：
2011-02
影响因子：
6.9
通讯作者：
C. Won;H. Nersisyan;H. Won
中科院分区：
文献类型：
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作者：
C. Won;H. Nersisyan;H. Won
采用SiO2+αMg（α为Mg的摩尔数）体系在惰性气氛中燃烧和燃烧产物的湿法冶金处理两步法制备了太阳能级硅微粒。研究表明，燃烧合成硅（CS-Si）中金属杂质的净化效果优于冶金级硅（MG-Si）中金属杂质的净化效果，这是因为CS-Si颗粒具有独特的微孔网络结构，这使得湿法冶金处理过程非常有效。电感耦合等离子体（ICP）分析结果表明，硅的纯度大于99.99%，可以通过开发的技术获得。本文从颗粒形态的角度讨论了CS-Si湿法冶金提纯的原理，并对多孔结构的形成提供了一个全面的解释。
Solar-grade silicon microparticles have been prepared by a two-stage technique consisting of a combustion process in a SiO2+αMg (α is the mole number of Mg) system in an inert atmosphere and the hydrometallurgical treatment of the combustion product. It has been shown that the refining behavior of the metallic impurities from combustion-synthesized silicon (CS-Si) is better than that of metallic impurities from metallurgical-grade silicon (MG-Si) since CS-Si particles have a unique microporous network structure, which makes the hydrometallurgical treatment process very efficient. Inductively coupled plasma (ICP) analysis results indicate that silicon of purity greater than 99.99% can be obtained by the developed technique. The principle of the hydrometallurgical purification of CS-Si is discussed in the context of particle morphology and a comprehensive explanation for porous structure formation is provided.