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Cyclone or Pre-leach thickener (2 replies)
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Interested in opinion on whether to install a pre-leach thickener ahead of a gold leach circuit or operate cyclone at higher density.
Option 1 - Cyclone O/F at 35% solids, P80 75um. Thicken to 65% solids and dilute with tails thickener O/F (cyanide recovery) and leach at 50% solids.
Option 2 - Cyclone O/F at 42% solids, P80 75um. Leach at 42% solids.
Both circuits have a tails thickener for cyanide recovery. Option 1 has 2 water circuits, cyanide free (milling make-up) and cyanide water. Tails U/F at 60% solids is diluted to 50% solids with decant return ahead of detox.
Removing pre-leach thickener saves capex and opex but requires milling in cyanide, lower density leaching (larger tanks), less efficient classification in cyclones. Will running at 42% solids O/F cause issues with achieving grind size consistently?
Comments, opinions, experiences appreciated.