1. Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
2. Research Center of Coal Resources Safe Mining and Clean Utilization, Liaoning Technical University, Fuxin, Liaoning 123000, China
3. State Key Laboratory of Mineral Processing, Beijing General Research Institute of Mining and Metallurgy, Beijing 100070, China
4. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China