Low separating lower limit: the lower limit of effective separating particle size can reach 1mm. High separating precision: Ep value: 0.12-0.23g/cm3. Separating particle size: the upper limit is 30~6mm adjustable. High product yield: all products can be recovered except the discharged reject. Good environmental protection effect: no argillization, all pulverized coal can be recovered, and the environmental protection effect is good. Low product moisture: compared with the water separation process, the cleaned coal product has low moisture and high calorifc value.