Study on Al Removal from MG-Si by Vacuum Refining

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• 作者：Kuixian Wei ; Damin Zheng ; Wenhui Ma ; Bin Yang ; Yongnian Dai
• 关键词：Vacuum refining ; Metallurgical ; grade silicon ; Aluminum removal
• 刊名：SILICON
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：7
• 期：3
• 页码：269-274
• 全文大小：381 KB
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• 作者单位：Kuixian Wei (1) (2) (3)
  Damin Zheng (1) (2) (3)
  Wenhui Ma (1) (2) (3)
  Bin Yang (1) (2) (3)
  Yongnian Dai (1) (2) (3)
  
  1. The National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, No. 253 Xuefu Road, Kunming, China
  2. The Key Laboratory of Vacuum Metallurgy of Non-ferrous Metals of Yunnan Province, No. 253 Xuefu Road, Kunming, China
  3. Silicon Metallurgy and Material Engineering Research Center of Universities of Yunnan Province, No. 253 Xuefu Road, Kunming, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Inorganic Chemistry
  Materials Science
  Organic Chemistry
  Polymer Sciences
  Biomedical Engineering
  Nanotechnology
  
• 出版者：Springer Netherlands
• ISSN：1876-9918

文摘

Aluminum is one of the main impurity elements in metallurgical-grade silicon (MG-Si). The methods of aluminum removal from MG-Si are slag refining, directional solidification, acid leaching and vacuum evaporation refining, respectively. Based on the theoretical calculation, the vacuum evaporation refining experiments for aluminum removal were carried out in this paper. The effects of refining time and temperature on the removal efficiency of aluminum were investigated. The results show that the vacuum evaporation is an efficient refining technique for removing impurity aluminum from MG-Si. The content of aluminum in MG-Si can be reduced from 1120 × 10? to 427 × 10?, and its removal efficiency is 61.9 %. Meanwhile, the removal efficiency of aluminum is improved with the increasing refining time and temperature during vacuum evaporation.