1 Inner Mongolia Research Institute, School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing, 100083, China.
2 Inner Mongolia Research Institute, School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing, 100083, China; Engineering Technology Research Center for Comprehensive Utilization of Rare Earth, Rare Metal and Rare-Scattered in Non-ferrous Metal Industry, CUMTB, Beijing, 100083, China; Key Laboratory of Separation and Processing of Symbiotic-Associated Mineral Resources in Non-ferrous Metal Industry, CUMTB, Beijing, 100083, China. Electronic address: dengshuai689@163.com.