1. School of Chemical Engineering and Technology, China University of Mining and Technology, No. 1 Daxue Road, Tongshan District, Xuzhou, Jiangsu 221116, China
2. Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, No. 1 Daxue Road, Tongshan District, Xuzhou, Jiangsu 221116, China
3. Yanzhou Coal Mining Company Limited, 98 Fushan South Road, Zoucheng, Shandong 273500, China