1. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, P. R. China
2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, P. R. China
3. National University Science and Technology Park, Kunming University of Science and Technology, Kunming, Yunnan 650093, P. R. China