Adsorption behaviour of copper and gold glycinates in alkaline media onto activated carbon. Part 1: Isotherms
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© 2018 Elsevier B.V. Alkaline glycine/glycinate solutions have been shown to have significant potential in the leaching of gold and copper from ores, concentrates, and wastes bearing these metals. An attempt was made to understand the adsorption behaviour of the gold glycinate complex onto activated carbon in the presence of copper for a pure alkaline glycine/glycinate system, after the gold has been dissolved using hydrogen peroxide as an oxidant and caustic soda as pH modifier. The adsorptive behaviour under various process conditions was evaluated using equilibrium loading isotherms. The linear regression (R2) values for the Freundlich isotherm for all tested parameters are close to unity, suggesting the model to be well suited for gold glycinate adsorption onto activated carbon. The maximum adsorption capacity of the gold complex on the activated carbon was determined as a function of free glycine concentration, solution pH, initial gold and copper concentration and calcium chloride salt concentration using synthetic solutions. The adsorption capacity increased with increasing free glycine, copper and calcium chloride concentrations, but decreased with increasing solution pH and initial gold concentration. This information can be used (with adsorption kinetics) to design and evaluate Carbon-in-Pulp (CIP), Carbon-in-Leach (CIL) and Carbon-in-Column (CIC) circuits for gold when copper may be present.
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Activated carbon adsorption of gold from cyanide-starved glycine solutions containing copper. Part 1: IsothermsTauetsile, P.; Oraby, Elsayed; Eksteen, Jacques (2019)Cyanide-starved alkaline glycine solutions have been shown to have distinct advantages in terms of lower reagent consumption and detoxification needs, or leach rate and recovery, over cyanide- only and glycine-only leach ...
Activated carbon adsorption of gold from cyanide-starved glycine solutions containing copper. Part 2: KineticsTauetsile, P.; Oraby, Elsayed; Eksteen, Jacques (2019)The downstream processing of leachates arising from the dissolution of copper bearing gold ores in cyanide-starved alkaline glycine solutions is imperative for the successful implementation of the new leach system at ...
Adsorption behaviour of copper and gold Glycinates in alkaline media onto activated carbon. Part 2: KineticsTauetsile, P.; Oraby, Elsayed; Eksteen, Jacques (2018)The kinetics for the competitive adsorption of gold and copper onto activated carbon from synthetic alkaline glycine solutions was studied. The adsorption rate for both gold and copper at the initial stage was modelled ...