Abstract: To solve the problem of environment pollution caused by coal gangue stacking，coal gangue from Datong Tashan Coal Mine was chosen as the research object. Based on the analysis characteristic，a feasible technology to separate coal gangue from kaolin rock was studied. The results show that，with the movable-bed jig separation process，kaolin rock yield reaches 26.67%，ash 72.02%，separation effect is favorable. Successful application of the separation system has important significance to improve the environment of mining area，meanwhile creates considerable economic benefits for the enterprise.

Key words: coal gangue, kaolin rocks, movable-bed jig, economic benefit