Abstract: In order to achieve the goals set for the sustainable development of a green, low-carbon and circular coal industry, work is made on the technical upgrading of Linhuan Plant's existing coal washing system especially the heavy medium washing equipment, separating density control system and coarse slime separation process by taking a series of practical and effective technical measures. Practice shows that through the use of the super H. M. cyclone, the raw coal can get effectively separated as the cyclone can work with an ecart probable moyen as low as 0.05 g/cm³ and a high organic efficiency of 98%( excluding the 0.5~0.25 mm size fraction); with the use of the upgraded separating density control system for the heavy medium washing process, the stability of the ash of clean coal is ensured, and the rate and yield of up-to-standard clean coal product is noticeably increased; and the use of the coal slime H. M. cyclone can allow for further extent of lower size limit of separation of coarse slime and lead to rise of yield of clean coarse slime product.