Abstract
The behaviour of some weak-base resins in gold cyanide solutions was unexpected under certain conditions. At pH values where the resins should have been in their free-base form and not functioning as anion exchangers, they sorbed gold cyanide. Titrations of various resins were carried out in the presence of gold cyanide and in its absence. The effect of high concentrations of sodium hydroxide on the extraction of metal cyanides by certain resins was investigated. From the results of the experiments it was proposed that in addition to the conventional mechanism of ion-pair formation with the protonated functional group, metal cyanides could be loaded by another mechanism which probably involves sorption of an ion pair formed between the cyanide anion and a sodium cation. In order to substantiate this proposal, the effect on loading by different alkali metal cations and their concentration in metal cyanide solutions was investigated. The effect of pH value and potassium ion concentration on co-sorption of potassium and metal cyanide, and the effect of temperature on sorption of gold and nickel cyanides provided convincing evidence for the proposed mechanisms.
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