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Hi,
I am looking for operating experiences for controlling and minimizing copper loading on activated carbon in a gold CIP circuit.
The project under consideration is still in design phase. The ore has some copper associated with chalcopyrite which causes copper in leach solutions to run at around 60ppm Cu.
There is plenty of literature that shows by running at high pH >10 and sufficient free cyanide, Cu(CN)3 and Cu(CN)4 prevails and does not load significantly on carbon. Maarsden recommends a 4:1 CN:Cu molar ratio which implies a free cyanide level of 185ppm is required.
Cu that does load on C can be removed by a cold cyanide wash.
Can I please get some operating examples to confirm this:
Cu in solution - ppm
Free cyanide level - ppm
Au loading on C - gAu/t
Cu loading on C - gCu/t
pH