use of hpgr for hard rock multi-stage crushing and ball mill circuits at high tonnage rates (parker et al 2001). table 2 provides a simple comparison of the various comminution circuits. the primary mill may be operated in open circuit or closed by a classifier such as a screen or a hydrocyclone.
the overall circuit configuration can guide selection of die classification method of primary circuit product. screening is more successful than trommel classification for circuits with pebble crushing particularly for those with larger mills. single-stage ag/sag circuits are most often closed with hydrocyclones. sag mill vs ball mill
karara mine has decided to shift the comminution workload from the primary ball mill to the towermill circuit by bypassing the 100 µm fine screen in between the ball mill and towermill circuits. this action has increased the circuit feed particle size distribution with a top size close to 1mm.
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amit 135: lesson 6 grinding circuit. contents. objectives; reading & lecture. ag/sag mills. ag/sag milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill circuit. two stage ag-grinding with the primary mill in open circuit and the secondary pebble mill in closed circuit.