Abstract: In order to adapt to the variation of property of raw coal treated and eliminate the trouble of plugging-up in operation of the 3GDMS1200/850 gravity-fed 3-product heavy medium cyclone previously used, the S-2GHMC440/360 super H. M. cyclone is used by the branch plant to replace the 3GCMC1200/850 version. As evidenced by result of test with a stand-alone super cyclone, the super cyclone can work remarkably with an organic efficiency of 99.48%, an E_pm value of 0.039 g/cm³, a rise of hourly capacity by 53.52%, much improved separation efficiency, reduced maintenance workload and costs, and a save of operating cost per ton of raw coal treated by 5.17 yuan. Moreover, its use can lead to thorough elimination of plugging of the tube connecting the cyclone′s first and second stages.