Abstract: Abstract: The tailings of clean coal magnetic separation of Huipodi coal preparation plant was recycled directly as coarse coal slime with high ash content. The washability of primary slime coarse coal slime was Medium optional. And experimental studies of separation feasibility on three coarse coal slime separators were conducted. Experimental results indicated that slime dense medium cyclone and TBS had better separation performance. Combined with the characteristics of the equipment and the plants layout, TBS should be adopted in the reconstruction of coarse coal slime system. The sales revenue of coal preparation plant can significantly increase by estimation after transforming of coarse coal slime system.