Effect of Calcium-Based Slag Treatment on Hydrometallurgical Purification of Metallurgical-Grade Silicon

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• 作者：Ming Fang ; Chenghao Lu ; Liuqing Huang ; Huixian Lai ; Juan Chen ; Jintang Li ; Wenhui Ma ; Pengfei Xing ; Xuetao Luo
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：January 15, 2014
• 年：2014
• 卷：53
• 期：2
• 页码：972-979
• 全文大小：545K
• ISSN：1520-5045

文摘

The effect of CaO鈥揝iO₂鈥揅aF₂ slag treatment on acid leaching of metallurgical-grade silicon was investigated in this study. Based on the analysis of the acid sensitivity of silicide precipitated phases, it was found that HCl + HF mixed acid was a better solvent to remove Si鈥揊e system intermetallics from metallurgical-grade silicon, and HCl was an effective leaching agent for eliminating Si鈥揅a system intermetallics from slag treated metallurgical-grade silicon. Acid leaching experimental results revealed that slag treatment enhanced the extraction of impurities Fe, Al, Mn, and Ti from metallurgical-grade silicon compared with results in the absence of slag treatment. Moreover, a remarkable decrease in the concentration of impurities B and P was attributed to the oxidation reaction in the slag refining process.