Journal Title
Title of Journal: Silicon
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Publisher
Springer Netherlands
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Authors: Kuixian Wei Damin Zheng Wenhui Ma Bin Yang Yongnian Dai
Publish Date: 2014/08/15
Volume: 7, Issue: 3, Pages: 269-274
Abstract
Aluminum is one of the main impurity elements in metallurgicalgrade silicon MGSi The methods of aluminum removal from MGSi 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 MGSi The content of aluminum in MGSi can be reduced from 1120 × 10−6 to 427 × 10−6 and its removal efficiency is 619 Meanwhile the removal efficiency of aluminum is improved with the increasing refining time and temperature during vacuum evaporation
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