Abstract
Hydrocyclones have found wide acceptance as classifiers because of their low cost and flexibility in operation. However, they are not very efficient as classifiers in closed circuit grinding. To improve their classification efficiency, a two-stage classification system involving two hydrocyclones in series has been successfully implemented at Rakha Concentrator of M/s Hindustan Copper Limited. This involved extra pumping to the second stage of classification. In order to avoid this, a modified “gravitational cone classifier” has been installed in place of the secondary cyclone. This paper describes briefly the modified system and the observations made during the plant trials.
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