1. Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China
2. College of Science, Inner Mongolia University of Science and Technology, Baotou 014010, China
3. School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China
4. Electronic Engineering School, Huaihai Institute of Technology, Lianyungang 222000, China