1. School of Energy and Materials Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, P. R. China
2. Institute of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000, P. R. China
3. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, P. R. China
4. Shanxi Province Mineral Resources Investigation and Monitoring Center, Taiyuan 030024, P. R. China