The autogeneous mill is also called the mill without medium, whose working principle is different from the ball mill. Its diameter is much bigger and do not need the balls or other grinding medium. The material itself is used as the grinding medium to strike and impack with each other. The oustanding feature is that the raw or cracked ores can be directly given into the mill.
The autogeneous mill can be divied into dry type (aerofall type) and wet type (purging type), and the wet mill is widely used in China. There are two drag modes, variable speed and stable speed with different power, and some mills are equipped with the micromotion unit.
The autogeneous mill can deal with any ores, such as crushing asbestos, iron, copper, limestone, gold, manganese etc. Its outstanding feature is high break ratio. The feeding size can be 300-400mm (can be 910mm in some special cases), while its finished granual can be less than 0.1mm. The break ratio is 3000-4000, which is ten times or tens of times of the ball or bar mills.