1. College of Mining, Guizhou University, Guiyang, China
2. Guizhou University, National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Re-sources from Karst Areas, Guiyang, China
3. College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou, China
4. Panzhou Market Supervision Administration, Panzhou Xiangyu Songshan Resources Recovery Co. LTD, Panzhou, China