Abstract: In order to solve the problems encountered in the operation of the plant's existing flotation system, the XJM-KS45 mechanical agitation flotation machine is selected for use instead of the K-FV50NS pneumatic flotation machine, and work is made on optimization of the flotation system. Practice shows that with the use of the XJM-KS45 flotation machine, the restriction on increase of production capacity imposed by flotation system is eliminated. Other advantages include much less necessity to reduce the ash of heavy medium separated clean coal to a level lower than necessary, increased yield of combined clean coal and noticeable economic benefit for the plant.