### ball mill critical speed

Ball mills have been successfully run at speeds between 60 and 90 percent of critical speed, but most mills operate at speeds between 65 and 79 percent of critical speed. Rod mills speed should be limited to a maximum of 70% of critical speed and preferably should be in the 60 to 68 percent critical speed range. Read More

### Mill Speed

In most cases, the ideal mill speed will have the media tumbling from the top of the pile the shoulder to the bottom the toe with many impacts along the way. The ideal mill speed is usually somewhere between 55% to 75% of critical speed. Critical Mill Speed. Critical Speed left is the speed at which the outer layer of media centrifuges