Analysis on feasibility of washing down to a further reduced size with shallow-trough heavy medium separator at Buliangou Coal Washery

In order to further improve the economic performance of Bulianggou Coal Washery, an investigation is made of the feasibility for the shallow-trough heavy medium separator to wash down to a smaller size, so as to increase the proportion of raw coal treated and the output of saleable coal for better economic performance. Previously the separator was treating a feed with a lower size limit of 13 mm which can be further reduced to 10 mm as evidenced by test result and field investigation. After the re-adjustment of the lower size limit, the yield of clean coal and sales income are seen to increase by 1.98percentage points and 12.27 million yuan respectively, bringing about for the washery a remarkable economic result. Moreover, the re-adjustment produces no adverse effect on the coarse coal washing system and slurry water treatment circuit.