1. Research Institute of Mine Big Data, China Coal Research Institute, Beijing 100013, P. R. China
2. State Key Laboratory of Coal Mining and Clean Utilization, Beijing 100013, P. R. China
3. Key Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China
4. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China