Ohoborak coal mine is located in Kuqa County, southern Xinjiang. The coal type is anthracite, and the lump coal is mainly for civil use. Due to the high content of reject, the sales are greatly affected. In November 2015, the mine selected ZM400 mineral High-efficiency separation system to separate and improve the quality of 20-80mm lump coal. The calorific value was increased from 4675kcal / kg to 6400kcal / kg. The supply of cleaned coal products after separation was in short supply.