1. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan 430081, P. R. China
2. Industrial Safety Engineering Technology Research Center of Hubei Province, Wuhan University of Science and Technology, Wuhan 430081, P. R. China
3. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China