Abstract
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 × 10−6 to 427 × 10−6, 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.
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