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Solvent elution of gold from C.I.P. carbon

Muir, D.M., Hinchliffe, W., Tsuchida, N. and Ruane, M. (1985) Solvent elution of gold from C.I.P. carbon. Hydrometallurgy, 14 (1). pp. 47-65.

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The effectiveness of the solvents in promoting gold desorption from activated carbon is in the order acetonitrile > methyl ethyl ketone ⩾ acetone ⪢ dimethylformamide > ethanol. Aqueous acetonitrile and aqueous acetone strip gold in < 8 h using 2–3 bed volumes at temperatures between 25 and 70°C. These organic solvents in particular are strongly adsorbed onto carbon and significantly increase the activity of CN− relative to Au(CN)2−. Acetonitrile is quantitatively steam stripped from carbon and has little effect on the kinetic activity of carbon and on the electrowinning or cementation of gold. However, acetone is not so readily recovered from carbon and causes a significant loss of carbon activity.
The concentrated gold eluates are readily electrowon in a batch or continuous mode using a simple diaphragm cell to give gold bullion foil. Preliminary cost analysis indicates that this procedure is cheaper than the Zadra elution procedure and comparable to the Anglo elution procedure.

Item Type: Journal Article
Murdoch Affiliation(s): School of Chemical and Mathematical Science
Publisher: Elsevier BV
Copyright: © 1985 Published by Elsevier B.V.
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