Journal
CANADIAN METALLURGICAL QUARTERLY
Volume 57, Issue 3, Pages 328-340Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00084433.2018.1464618
Keywords
Make-up ball size regime; closed-circuit grinding; hydrocyclone; throughput; cut-size (d(50))
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Funding
- National Iranian Copper Industries Company (NICICo.)
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An industrial ball mill operating in closed-circuit with hydrocyclones was studied by five sampling surveys. The aim of the present study was to optimise operating parameters (i.e. charge volume, make-up ball size regime, slurry mean residence time, number of hydrocyclones in operation and hydrocyclone's feed solids content (S-f)) with respect to increasing throughout from 225 to 300 tons per hour (tph). The obtained results showed that increasing charge volume from 32 to 39% led to producing approximately 9% finer product size (P-80). Binary ball size regime rather than using mono-sized balls resulted in reduction of the P-80 relatively 5%. The S-f was identified as the most effective parameter on grinding efficiency. The cut-size plunged dramatically from 130 to 90m by reduction of S-f from 54 to 48%. Finally, it was concluded that the capacity of grinding circuit could be practically increased to 300 tph if all relevant parameters fell into the optimised ranges.
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