### Ball Mills - an overview | ScienceDirect Topics

Separator efficiency is defined as specific power consumption reduction of the mill open-to-closed-circuit with the actual separator, compared with specific power consumption reduction of the mill open-to-closed-circuit with an ideal separator. The reduction of sieve residues by comminution is considered to be a first order process, represented by: E = W ∗ log R 0 / R f, where. E is specific ...