High copper content in Gold Dore - Pyrometallurgy: Roasting, Smelting, Refining & Calcining + Electrowinning - Metallurgist & Mineral Processing Engineer

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High copper content in Gold Dore (1 reply)

1 year ago

John KK 1 year ago

Hi everyone

Recently we are getting high copper in our gold dores, is there a way to lower the amount of copper. My flux recipe and fineness results are below.

Calcine = 1000 gram

Borax = 120 gram

Silica = 25 gram

Soda Ash = 120 gram

Au（%)	Ag（%)	Cu（%)	Ru (%)	Fe (%)	Ni (%)	Pb (%)	Mo (%)
85.190	6.690	7.590	0.400	0.000	0.140	0.000	0.000
84.920	6.530	7.870	0.410	0.000	0.160	0.110	0.000

Thank you

Jorge

1 year ago

Jorge 1 year ago

1 like by Ayisha

The ore contents soluble copper minerals in cyanide. I think, the ore comes from a new zone or the blending was not correct. In order to reduce the copper content in the gold bars, it is important to minimize the effect of copper in the leaching process. The addition of ammonium can be useful. It has been found that the addition of 2 to 6 g/L of ammonium in the cyanide leach solution can improve the gold dissolution over copper. The presence of ammonium promotes the complexation of copper 1, the generation of copper 2 as an oxidant, and the precipitation of copper. If you don't attack the soluble copper as soon as possible, it will be reported in the gold bars.

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