China University of Mining & Technology, Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), Xuzhou 221116,, Jiangsu, China
China University of Mining & Technology, National Engineering Research Center of Coal Preparation and Purifi cation, Xuzhou 221116,, Jiangsu, China
Jie Ren
China University of Mining & Technology, Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), Xuzhou 221116,, Jiangsu, China
China University of Mining & Technology, Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), Xuzhou 221116,, Jiangsu, China
Takayuki Takarada
Gunma University, Division of Environmental Engineering Science, 1-5-1 Tenjin-cho,, Kiryu, Japan