Abstract: work is made on the optimization of the flotation system of the plant proceeding from 2 aspects: optimization of feed size and reduction of pulp density. Through the above-going optimization work, the flotation performance is much improved with the ash of flotation concentrate maintaining at a level of below 11% and a rise of the ash of tailings by over 10 percentage points. Moreover, with the stabilization of the concentrate ash, it is possible to reduce the ash of the clean coal product of the plant′s heavy medium separation system. This has led to not only an increase of the recovery of the heavy medium separated clean coal, but also a substantially favorable economic result.