1. National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221000, Jiangsu, People’s Republic of China
2. School of Chemical Engineering & Technology, China University of Mining and Technology, Xuzhou 221000, Jiangsu, People’s Republic of China
3. School of Materials and Chemical Engineering, Kaifeng University, Kaifeng 475001, Henan Province, People’s Republic of China