Abstract: For the reason that the coarse slime cannot get effectively separated, the ash of the clean coal product of the heavy medium washing system has to be reduced to an unnecessarily low level, and there are found entrained coarser particles in flotation feed and accumulation of fine slime in circulating water. To revert the situation, the plant's coarse slime recovery process is renovated with the use of the teetered-bed separator(TBS) following a comparative analysis of the advantages and disadvantages the H. M. cyclone, spiral separator, water-only cyclone and TBS. Practice shows the application of the TBS has led to a rise of yield of clean coal by 0.89 percentage points and a drop of medium consumption to 0.50 kg/t, creating as a result a favorable economic result for the plant.