1 School of Environment and Spatial Informatics, China, University of Mining and Technology, Xuzhou, 221116, China.
2 National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, 221116, China. lishuleibgs@163.com.
3 National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, 221116, China. yijuncao@126.com.
4 School of Chemical Engineering and Technology, Zhengzhou University, Zhengzhou, 450001, China. yijuncao@126.com.