1. School of Materials and Chemistry State Key Laboratory for Environment-friendly Energy Materials Southwest University of Science and Technology 59 Qinglong Road Mianyang 621010 P. R. China
2. Post-doctoral Scientific Research Station of Wengfu (Group) Co., Ltd. State Key Laboratory of Efficient Utilization for Low Grade Phosphate Rock and Its Associated Resources 3491 Baijin Road Guiyang 550016 P. R. China