Abstract: In order to meet the requirement for reducing as much as possible the output of untreated coal slime, a study is made with the power coal treated by Huaibei Taoyuan Coal Preparation Plant as the object. Based on analysis of size and density and mineral composition of the coal, a three-stage technical route to attainment of the objective through the use of the following stagewise processes is proposed: reduction of ash of coarse slime and tailing through gravitational separation system and in-depth flotation process, respectively, and dewatering of tailing using new-type hydropress. Study results shows that for treatment of coarse slime, compared with teetered-bed separator, the use of spiral separator can lead to a much higher yield and a lower ash of clean slime, which are 88.82% and 23.05%, respectively; and the tailing is treated only through a single flotation process, and with the dosage of agents and feed density at 0.45 kg/t and 90 g/L, respectively, the concentrate yield and ash are 41.31% and 15.74%, respectively, raising the calorific value of concentrate to a level of 20.97 MJ/kg. Through separation of coarse slime, flotation of tailing, and dewatering of fine slime, the clean coarse slime and flotation concentrate both see a rise of calorific value by 23.50% and 65.30%, respectively. After dewatering all the slime products can be blended with clean coal, allowing calorific value of commercial coal to go up to 21.32 MJ/kg, and hence making it possible to realize in-plant full recovery of coal slime.