Abstract: In view of the continuous increase of the proportion of gangue in raw coal, it is proposed to remove the waste in raw coal prior to its washing using sophisticated dry cleaning equipment for relieving the pressure of increasingly expanding capacity of coal cleaning plant and environmental protection, cutting coal cleaning costs and enhancing automation level of the plant. The raw coal produced in Huaibei Mining Area is taken as the object of study. An in-depth analysis is made of the dirt removal effectiveness actually obtained by using 3 types of dry cleaning machines respectively, i. e. the FGX compound separator, the ZM high-efficiency separator and the TDS intelligent raw coal destoning separator, as well as their respective features and drawbacks. As evidenced by both industrial and pilot-scale test, the FGX version can treat a feed most preferably in a size range of 50-6 mm and is suitable for preliminary deshaling of raw coal or separation of power coal whose ash content is not required to be reduced by a big margin; the TDS separator can effectively treat a feed with a size of 300-25 mm and can be used in place of handpicking; the ZM separator can effectively treat a feed of 100-0 mm and is suitable for separation of power coal whose calorific value is not required to exceed 6.28 MJ/kg, and for separation of coarse coal, its efficiency is higher than that for small coal.