### energy efficiency of cement finish grinding in a dry batch

Mar 01, 2006 · The fractional filling of voids between the balls (U) can be calculated by U = fc / 0.4 J; fc is the formal fractional mill volume filled by powder using a powder porosity of 0.4. The ball load distribution composed of grinding balls of 30, 20 and 10 mm was varied (Eq. (2)) according to the Gaudin–Schuhmann distribution equation