Based on discharge methods can be divide into 3 models overflow type ball mill , grate (or grid ) type ball mill , and peripheral type (this type most is
rod mill )
Grate type ball mill
The grate type ball mill is a low-level forced ore discharge machine, which stores less slurry in the grinding machine. so, higher density minerals are not easily concentrated in the grinding machine.
Overcrushing is lighter than overflow type ball mills
The grinding speed can be faster.
The productivity of grate type is usually 10% to 20% higher than overflow type.
Overflow type ball mil
Overflow type ball mill has a simple structure
Easy to manage and maintain.
It is better for fine grinding than grate type,
Overflow type ball mills are often used in mineral processing.
How to choose different types of ball mill
1)Discharging size ＞ 0.2mm , usually by grate type ball mill or over flow type ball mill;
2)Discharging size ＜ 0.2mm, usually by over flow type ball mill;
3)2-stage grinding
First stage usually by grate type or over flow type
Second stage usually by over flow type
How to decide grinding stage number?
1)Discharging size P80 (200mesh < 65% , check mesh to mm converter ), usually use one stage ball mill grindingP80=106~75um(200mesh is 65% - 80%) , by two stage.
3)Discharging size P80=75~55um(200mesh is 80% - 90%), by three stage
3)Discharging size P80<55μm(200mesh is> 90%),by three stage
