1. Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education China University of Mining & Technology Xuzhou Jiangsu 221116 China
2. College of Chemical and Biological Engineering Shandong University of Science and Technology Qingdao Shandong 266590 China
3. Key Laboratory of Coal Cleaning Conversion and Chemical Engineering Process, Xinjiang Uyghur Autonomous Region Xinjiang University Urumqi Xinjiang 830046 China