It is the percentage of mill rotation rate of the ball mill and the actual work than the critical rotation speed of the tree itself which is often expressed as [Psi], which is calculated as:
It is customary to ψ <76% substrate called grinding speed; ψ = 76 ~ 88% referred to as a grinding medium speed; ψ = 88 ~ 100% is called a high speed grinding; ψ> 100 called supercritical speed grinding . When supercritical speed grinding is carried out, a smooth lining plate is used, the ball loading is small, and the ball does not undergo centrifugation.
The production practice proves that at a rotation rate of less than 90% , increasing the rotation speed of the ball mill can greatly increase the productivity of the mill, and the power consumption is not increased much, and the grinding efficiency is improved. However, the transfer rate is greater than 90% , and then the ball mill speed is increased, the productivity increase is not obvious, the power consumption is increased rapidly, and the grinding efficiency is lowered.
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