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Effect of Ball Size on the Performance of Grinding and Flotation Circuits at the Sarcheshmeh Copper Mine
By
S. Banisi, M. Askari, M. Farzaneh and M. Poorkani
Published in
Canadian Mineral Processors Conference (CMP)
at
2002
Direct link:
http://kmpchemmat.ir/pii/34772
Abstract
At the Sarcheshmeh copper mine, 40,000 tons of ore per day with an average grade of 0.9% Cu are ground to 70% passing 75 microns using 80-mm forged alloy steel balls with an average consumption of 750 g of ore ground. To optimize ball size distribution, a combination of 80 and 60 mm (75% to 25% by weight) ball charge was used in one of the mills. Four identical parallel mills were charged with different ball types, namely forged alloy steel balls, ductile cast iron, high chromium cast iron, and a combined (80 and 60 mm) charge of forged alloy steel balls. The mill with the combined make-up balls produced 4% more fines than the other mills, and the consumption of ball types A, C, and D were 730, 710, and 534 g, respectively. Laboratory flotation tests showed that the new make-up ball regime resulted in an increase of 1.4% in the overall copper recovery. As a result, the new make-up ball regime was implemented in all mills in the plant.
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