1. State Key Laboratory of Coking Coal Resources Green Exploitation, China University of Mining and Technology, Qinhuangdao, Hebei, China
2. Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, Jiangsu, China
3. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu, China
4. School of Chemical Engineering and Technology, Zhengzhou University, Zhengzhou, Henan, China