Abstract
The equations proposed previously by Austin, which allow for the presence of conical end sections on a cylindrical mill, have been applied to data on Hardinge conical ball mills ranging from 0.83 m in diameter to 2.9 m in diameter. The equations predict the volume and mass of balls required to give a desired fractional filling of the cylindrical section by the ball bed, and the effect of the end sections on mill power. Converting the measured shaft power on the mills to the equivalent power for the cylindrical section gave a variation of mill power per unit length with respect to mill diameter of D2.3, in agreement with the Bond mill power equation. However, the predicted mill power is 10% higher than that given by the Bond equation.
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