Abstract
Effects of variations of certain factors inherent in potmilling, on the grinding of sillimanite, have been studied.Duration of grinding has a direct bearing on the production of material finer than 2.5μ from sillimanite sand. Variations in the ratio of weight of pebbles to weight of sillimanite indicate that there is an optimum ratio at which maximum grinding takes place. The ground sillimanites develop base exchange capacity which is in direct proportion to the quantity of material finer than 1μ. An important finding of these studies is that grinding sillimanite to finer than 1μ releases considerable quantities of alumina that can be leached out with hydrochloric acid. Apparently, fine grinding tends to release alumina from sillimanite.
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