College of Mining;
Guizhou University;
Guiyang 550025;
China;
National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas;
Guiyang 550025;
China;
Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources;
Guiyang 550025;
China;
Guizhou Panjiang Clean Coal Co.;
Ltd.;
Liupanshui 553000;
China;
Coal; Rare earth elements; Occurrence mode; Kaolinite; Pre-concentration;