— A plug-flow model is described for the reactor mass balance of a typical AARL gold elution process. The model is in the form of a hyperbolic differential equation and was transformed using the method of characteristics. The transformed model was then solved simultaneously with models dependent on intraparticle surface diffusion and film transfer …
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Semantic Scholar extracted view of "Factors affecting the elution of gold cyanide from activated carbon" by J. Deventer et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 221,157,152 papers from all fields of science. Search ...
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— In the gold hydrometallurgy industry, gold is extracted from cyanide leaching solution by adsorption onto activated carbon. The main advantages of activated carbon are its high selectivity towards gold relative to base metals, its ease of elution and its large particle size [13], [14], [15].
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In the gold recovery industry, there are three main methods for extraction of the metal, all of which use granular activated carbon in the recovery of gold from cyanide leachate solutions: – Carbon-in-Pulp (CIP) ... – High rates of gold loading and elution – Low/zero platelet concentrations – Good resistance to mechanical attrition
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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 …
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— The ZADRA system is another elution process where gold that is adsorbed on to activated carbon is desorbed from the carbon by a reversal of the adsorption kinetics.
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— Water used in gold elution is approximately 10% of the volume in cyanidation, and it is recycled up to . ... The adsorption of gold in activated carbon is clearly related to the presence of thioglycolic acid. The thiol groups, especially sodium thioglycolate, can reduce disulfide bonds, later, these can be re-oxidized by insertion of ...
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— Exciting new developments are taking place in the extractive metallurgy of gold, which are based upon the adsorption of the metal or its complexes on carbon and subsequent elution. Despite the efforts of investigators over a period of almost 70 years, however, the mechanisms of the adsorption and elution processes have not yet been …
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— The objective of this study was to investigate an improved process for recovering gold from activated carbon. The process involves contact of gold laden …
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The effect of particle size on gold adsorption and elution from activated carbon has been studied in alkaline solution, in order to understand the nature of gold losses on fine activated carbons, to improve the rate of gold recovery, and to develop an innovative way of treating preg-robbing gold ores. Four stripping techniques (atmospheric Zadra, syringe and …
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Parameters affecting gold elution using the AARL process are reviewed and critically analyzed in an attempt to optimise metallurgical efficiency and minimise costs in both …
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— In fact, in the Zadras Elution process that is commonly employed to strip AuCN from loaded activated carbons, the elution solution (typically containing 1% sodium hydroxide and 0.2% sodium cyanide ...
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— of Gold Cyanide of Elution from Activated Carbon J.S.J. VAN DEVENTER and P.F. VAN DER MERWE 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.
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— 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 …
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One of the main bottlenecks in the carbon-in-pulp process for the recovery of gold is the elution procedure, which typically requires the heating of caustic cyanide eluants to high temperatures for 16 to 24 hours. The …
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— Activated carbon and resins readily adsorb gold from cyanide leach solutions. The main advantages of carbon are its high selectivity towards gold, its ease of elution and its large particle size. On the other hand, resins do not suffer from the problems of pore blocking by fine particles in the slurry and show superior adsorption kinetics and ...
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— More than 60% gold on activated carbon could be desorbed within 1 h for activated carbon with gold capacities from 1 to 5 kg/t, and 80% gold on activated carbon …
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— The gold-loaded activated carbon is subjected to elution followed by either electrowinning or cementation using zinc powder. CIP is preferred for its higher recovery rates and cost-effectiveness compared to CIL, as the separate leaching and adsorption phases in CIP offer better control and optimization.
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— The gold particles are held on the surface of the activated carbon. Elution Process: The gold-loaded carbon is introduced into an elution column or vessel. A hot solution, typically a cyanide solution mixed with sodium hydroxide or another suitable eluant, is passed through the column. The cyanide solution acts to desorb or strip the …
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— Kinetic modelling of gold cyanide multi-cycle adsorption and elution using activated carbon in the presence of foulants @article{Otu1993KineticMO, title={Kinetic modelling of gold cyanide multi-cycle adsorption and elution using activated carbon in the presence of foulants}, author={Emmanuel O. Otu and John J. Byerley and Campbell W. …
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— The kinetics of the elution of gold from activated carbon; R.J. Davidson A review of the AARL process for the elution of gold from activated carbon; R.J. Davidson et al. Further studies on the elution of gold from activated carbon using water as the eluant. J.S.Afr.Inst.Min.Metall. (1979)
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Further studies on the elution of gold from activated carbon using water as the eluant. Journal of South African Institution of Mining and Metallurgy 79 (19), 437–495. McDougall, G.J., Adams, M.D., Hancock, R.D., 1987. Models for the adsorption of aurocyanide onto activated carbon: Part I. Solvent extraction of aurocyanide ion pairs by 1 ...
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— The elution of gold and silver from activated carbon using organic solvents and the reactivation of the eluted carbon, Anglo American Research Laboratories, Report 6, Johannesburg, 1976. 9 Jankowska, H., Neffe, S. and Swiatkowski, A., Investigations of the electrochemical prop- erties of activated carbon and carbon black, Electrochim.
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A novel procedure was used to study the kinetics of multiple exposure of a granular activated carbon in a laboratory-scale packed bed to solutions containing gold and sodium cyanide, or in addition one of several organic reagents commonly used in …
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— One of the main bottlenecks in the carbon-in-pulp process for the recovery of gold is the elution procedure, which typically requires the heating of caustic cyanide eluants to high temperatures...
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The attrition of activated carbon, and the loss of gold associated with it, is of significant economic importance to the operation of a CIP/CIL circuit The focus of this study was on activated carbon recovered from an elution circuit which was deemed too fine for reuse. Results of cyclosizer and laser particle size analysis identified that most
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— The adsorption products of KAu (CN) 2 on activated carbon and carbon black have been investigated using microanalysis and X-ray photoelectron spectroscopy. Gold is adsorbed as Au(I) under all conditions studied, the gold species being highly dispersed on the carbon and evenly distributed between external and internal surfaces.
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Figure 8 illustrates the elution of platinum, palladium, and gold from activated carbon with distilled water at 80°C after pre-treatment with a caustic cyanide solution as outlined in the previous section. A typical elution profile can be seen for platinum and palladium with a peak in concentration around 2 BV for both platinum and palladium ...
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Parameters affecting gold elution using the AARL process are reviewed and critically analyzed in an attempt to optimise metallurgical efficiency and minimise costs in both current and future carbon adsorption operations. Such factors as acid washing, column geometry, elution temperatures and pretreatment reagents are discussed together with …
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— Activated Carbon is one of the most effective ways to recover your gold from any mining process because of its strong absorbing capabilities.
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