1. Inner Mongolia Key Laboratory of Coal Chemical Engineering & Comprehensive Utilization, School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, Inner Mongolia, P. R. China
2. Inner Mongolia Cooperative Innovation Center for Green Coal Mining & Green Utilization, Baotou 014010, Inner Mongolia, P. R. China
3. Inner Mongolia Engineering Research Center of Coal Cleaning & Comprehensive Utilization, Baotou 014010, Inner Mongolia, P. R. China
4. School of Materials and Metallurgy, Inner Mongolia University of Science & Technology, Baotou 014010, Inner Mongolia, P. R. China