Abstract
The wear generated in grinding balls having a ball size distribution in a tumbling mill was investigated using a laboratory-scale mill for both dry and wet grinding. The balls were divided into five diameters with the same mass fractions. The weight loss of grinding balls with a diameter Db, Mb appeared to have a non-linear relationship with the time of milling t in the ball mill. The kinetics of wear could be expressed as a power law of the type Mb=Atb, where the coefficient A is a function of the ball diameter Db, and the exponent b is a constant. The coefficient A obtained for each ball diameter, with the exception of the maximum diameter, followed the power law A ∝Dbn-3, based on the formulation of the weight loss of a grinding ball mb as mb∝Dbn. The exponent n indicates the ball wear mechanism in ball mill grinding. A value of n = 2 fits the surface theory which indicates that the intensity of the abrasive interactions in ball milling can be improved, while a value of n = 3 is in accord with the volume theory which shows that the intensity of the impactive interactions can be increased. In this study, the ball wear mechanism for dry milling changed from the volume theory to the surface theory with an increase of the milling time, while the mechanism of wet milling was consistent with the volume theory irrespective of the milling time.
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