The biggest feature of the self grinding mill is that the raw ore from the stope or the coarse crushing ore can be directly fed into the mill. Usually, the mineral is fed to the mill at a certain particle size. The mill can grind the material to 0.074mm at once, and its content is more than 20%~50% of the total amount of the product. The crushing ratio is up to 4000~5000. More than ten times higher than ball mill and baseball machine. Self grinding mill is a new grinding equipment with two functions of crushing and grinding. It uses the grinding material itself as the medium and achieves the grinding by mutual impact and grinding. Autogenous mills are also called non media mills.