1. Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei 430070, China
2. Instituto de Fisica, Universidad Autonoma de San Luis Potosi, Av. Manuel Nava 6, Zona Universitaria, C.P. 78290 San Luis Potosi, S.L.P., Mexico
3. High Technology Research and Development Center, Sanlihe Road 1, Beijing 100044, China
4. School of Xingfa Mining Engineering, Wuhan Institute of Technology, Xiongchu Avenue 693, Wuhan, Hubei 430073, China