Abstract: In order to solve the problems of seriously aging,lack of processing capacity and poor flotation efficiency of flotation machine used in Kailuan energy chemical Co Ltd Fangezhuang coal mining company coal preparation plant,so that the XJM-S20 flotation machine is used to replace the original equipment.The paper introduced the structure,working principle,characteristics and technical parameters of XJM-S20 flotation machine,and analyzed the application effect and its economic benefits of new equipment.