Abstract: Because of the failure of the high-frequency primary slime recovery screen to completely retain the oversize particles, the flotation system of the plant is caused to handle a feed with a size exceeding the top limit. The undercapacity and low efficiency of the flotation system restrict as a result the plant′s overall slime separation capacity. Following an analysis of the problems involved, technical transformation work is made through addition of coarse slime separation process and flotation machines. As indicated by the results of the transformation work, the teetered-bed separator can work remarkably well with an organic efficiency reaching 98%, and the fine slime in the overflow of the separator can be efficiently removed using the stacked-up high-frequency vibrating fine screen, enabling the cleaned coarse slime to see a reduction both in ash (0.23 percentage point lower than the previous figure) and moisture; The proportion of the > 0.25 mm size in the flotation feed is greatly reduced with the ash of flotation tailing rising to around 67%, up 27 percentage points on the previous figure; the yield of combined clean coal product has seen a surge from 75.40% to 78.57%; and the raw coal treatment capacity has risen from 0.4 Mt/a to 1.2 Mt/a, allowing the plant to produce an additional clean coal product of approximately 0.64 Mt a year when the plant works with a full capacity, bringing forth a favorable economic result for the plant.