1. The National Engineering Laboratory for Vacuum Metallurgy, State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, P. R. China
2. Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial Universities, Kunming University of Science and Technology, Kunming, P. R. China