Abstract
Factors influencing the adsorption of gold cyanide onto activated carbon are well known, but there is currently no consensus of opinion on the actual mechanism of extraction. This situation has arisen mainly because activated carbon is not readily amenable to conventional techniques of chemical investigation such as infrared and ultraviolet-visible spectroscopy. This study reports on a novel approach using a model system in which the analogous behaviour of the extraction of gold cyanide by ion-pair solvent extraction is demonstrated. The effect of the nature of the cation on gold extraction by activated carbon is explained in terms of the type of ion pair, viz., [M n+ ][Au(CN) 2 −] n , formed between the Au(CN) 2 − anion and the cation M n+ present in the adsorption medium.
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