1. School of Mining, Guizhou University, Guiyang, Guizhou, China
2. Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources in Guizhou Province, Guizhou University Mining College, Guiyang, Guizhou, China
3. National Local Joint Engineering Laboratory for Efficient Utilization of Advantageous Mineral Resources in Karst Region, Guiyang, Guizhou, China
4. Guizhou Panjiang Clean Coal Co. Ltd, Tucheng Mine, China