Abstract: Xinjulong Coal Preparation Plant is facing the trouble of having a heavy loss of clean coal in tailings product of secondary flotation process. The tailings product has a density of 91.34 g/L and an ash of only 27.67%. Through technical renovation of the secondary flotation system and addition of one high-frequency fine screen which works in series with a battery of cyclone classifiers, the coal particles lost in tailings can now be recovered by taking high-efficiency tailings classification, desliming and ash reduction measures. The efforts made has yielded a noticeably good result as the ash of the final small coal product is reduced to 8.56% and the yield of clean coal product is increased by 0.26 percentage point, creating as a result a favorable economic result.