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How to effectively identify overdosing of lead nitrate [Pb(NO3)2] in gold cyanidation.
I'm interested in optimizing the lead nitrate addition at a standard 4000 tpd gold mill using conventional cyanidation. We currently add -240g/t lead nitrate to try to maintain our 'reducing power' (ppm SCN/S2O3) between leach and grinding at 60ppm. Can anyone elaborate on how to identify overdosing, specifically with respect to formation of insoluble lead hydroxides at the operating pHs between 10.7-11.3.