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Effect of Magnesium Addition on Removal of Impurities from Silicon by Hydrometallurgical Treatment

机译：通过氢冶金处理对硅杂质除去杂质的影响

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摘要

Hydrometallurgical treatment of silicon is an effective process for the removal of metallic impurities for producing solar grade silicon feedstock. In the present research, the removal of impurities from silicon is studied through the addition of Mg into a commercial silicon, its solidification, and acid leaching. The effect of concentration of HC1, temperature and leaching duration on the removal of impurities are studied. It is shown that the impurities such as P, Fe, Al, Ti, Ca,... are effectively removed through the applied method and Mg improves the segregation and the removal of the impurities. Scanning electron microscopy examination of the samples indicates the disintegration and dissolution of Mg2Si phase in acid leaching which causes the chemical and physical removal of the impurities existing in the phases between the silicon grains. It is shown that the leaching process rate can be optimized through the control of the acid leaching conditions.
机译：硅的液压冶金处理是用于去除生产太阳能级硅原料的金属杂质的有效方法。在本研究中，通过将Mg加入商用硅，其凝固和酸浸出，研究了从硅中除去硅的杂质。研究了HC1，温度和浸出持续时间对杂质去除的浓度的影响。结果表明，通过所施加的方法和MG改善副化和杂质的去除，有效地除去诸如P，Fe，Al，Ti，Ca，...的杂质。样品的扫描电子显微镜检查表明Mg2Si相中的崩解和溶解在酸浸出中，这导致硅晶粒之间存在的杂质的化学和物理去除。结果表明，可以通过控制酸浸出条件来优化浸出处理速率。

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