Analysis of the key points in control of process paramereters in heavy-medium separation of extremely difficult-to-wash coal

The paper first presents an introduction to China's raw coal washability evaluation criteria and then points out the problems concerning the underutilization at the present stage of the extremely difficultto-wash coal especially the scare coal resources. Then,an in-depth analysis is made of the key points in control of the process parameters involved in heavy-medium separation of the above-cited coal. The research-derived achievements provide a certain technical support for the design of the parameters involved in separation of difficult-to-wash coal with H. M. cyclone in the future.