1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences; Beijing 100083 P.R. China
2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences; 810008 P.R. China
3. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province; 810008 P.R. China