The production capacity of Zhuanlongwan coal mine of Ordos energy and Chemical Co., Ltd. has been expanded from 5.0mt/a to 8.0mt/a. The policy requires that coal preparation plants of the same scale must be equipped. In 2015, Shenzhou group built a 3.0mt/a dry process coal preparation plant. After separation, the calorific value of block clean coal increased by 1800kcal / kg and that of final clean coal increased by 1000kcal / kg. The project has the advantages of high product recovery rate, energy conservation and environmental protection.