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Much controversy exists about the mechanism by which gold cyanide adsorbs on activated carbon. It is not the purpose of this article to explain the exact adsorption mechanism but, rather, to investigate the factors affecting the reversibility of adsorbed gold cyanide. Whereas Au(CN) 2 is soluble in water, AuCN and Au require the addition of cyanide to form Au(CN) 2 .
The elution of gold cyanide is suppressed by the presence of cations (Mn+) through the formation of Mn+ (Au(CN)2) on the carbon. The horizontal position of the gold peak in an AARL elution profile was found to be a function of the elution of the cations from the carbon bed.
van De venter, and van der Merwe,, (1994), quot;Factors affecting the elution of gol d . Free cyanide is usually present during the elution of gold cyanide from activated carbon. The
Numerous articles have appeared on the mechanism of the adsorption of gold cyanide onto activated carbon. In contrast, little information is available on the mechanism of elution of the adsorbed gold. It is the objective of this article to formulate such a mechanism on the basis of batch and column elution tests without analyzing adsorbed species on the carbon directly.
Van der Merwe,, 1991. Fundamentals of the Elution of Gold from Activated Carbon, PhD thesis, University of Stellenbosch. and the concentrations of cyanide and cations on the gold cyanide
required equipment required for cyanide process of gold . equipment required for cyanide process of goldCaso . to an alkaline sodium cyanide solution will cause the gold and silver to react with the cyanide and dissolve into the solution in a process called cyanidation. This process is more frequently referred to as leaching. copper or zinc that may be in the ore. Cyanide Leaching Of Gold . Chat Online
Whereas Au(CN){2 /} is soluble in water, AuCN and Au require the addition of cyanide to form Au(CN){2 /}. The reversibility of the adsorption of gold onto carbon is a function of the nature of the adsorbed gold and determines the need for cyanide in the elution process, which affects the operating costs of a carboninpulp (CIP) plant.
point, and experiments suggest the possibility of an optimum cyanide concentration, beyond which elution efficiency starts decreasing. Introduction The carboninpulp or carboninleach (CIP and CIL) processes have been the main commercial processes on almost every gold plant built since 1980 (Fleming, 1992; Van Deventer, 1984).
The elution of gold cyanide is suppressed by the presence of cations (Mn+) through the formation of Mn+ (Au(CN)2) on the carbon. The horizontal position of the gold peak in an AARL elution profile was found to be a function of the elution of the cations from the carbon bed.
van Deventer ; van der Merwe (1994) Article Functional relationships were determined between the effects of pH, temperature, and the concentrations of cyanide and cations on the gold cyanide equilibrium during elution from activated carbon in columns and in batch reactors.
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