In beneficiation plant hydrocyclone plays an important role in classification of crushed and ground ore. Proper classification with minimum misplacement or misplacement within the limit of plant designed specification helps in getting desired product quality at high recovery. Established model or specification from supplier is used for selection of hydrocyclone. The present study shows, plant cyclone operation could be optimised on the basis of few fundamental variables viz., feed inlet pressure, per cent solids in the feed slurry and spigot diameter. During optimisation studies, effect of change of these process variables could be evaluated and compared on the basis of misplacement of particles, classification efficiency, imperfection value, and sharpness factor and process optimum conditions were arrived at. Cut-size and sharpness factor was determined for optimum process conditions through plant studies. Using a partition curve, product size distribution could be predicted for any known feed size distribution. The optmisation study could reduce misplacement by 3% and the overall yield improvement was around 0.8%.
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