Abstract: In order to adapt to growth of mine output and change of raw coal property, work is made capacity expansion and process optimization of the coal cleaning systems and equipment in current use at the plant. Practice shows that the technical transtormation has led to increase of plant capacity to 1.2 Mt/a, a net growth by 0.6 Mt/a, perfection of coking coal washing processes, higher reliability of washing systems and higher market competitiveness of products.