WEARING PERFORMANCE OF STEEL BALLS IN WET GRINDING

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The forms of the dynamic and statistic models of the wear of steel balls in wet grinding have been deduced from theories. The effects of five main factors(ball charge ratio, mass of feed, pulp density, pH value and contents of H 2O 2 in pulp) on the parameter of the dynamic model were studied in tests. The regression equation between the wearing rate of the steel balls and the grinding conditions was established. The result showed that the wearing rate of steel balls decreases with growth of the ball charge ratio, increases with growth of the contents of H 2O 2 in pulp, and reaches a minimum when the volume of feed is about 5% of the internal volume of the mill. There is insignificant effect of the pulp density and the pH of pulp on the wearing rate of steel balls under the circumstances of these tests.