Activated carbon adsorption of gold from cyanide-starved glycine solutions containing copper. Part 1: Isotherms

摘要: Abstract Cyanide-starved alkaline glycine solutions have been shown to distinct advantages in terms of lower reagent consumption and detoxification needs, or leach rate recovery, over cyanide- only glycine-only systems respectively for gold ores with nuisance copper. Activated carbon has be suitable adsorption from systems, is well established cyanide based systems. being an effective substrate the thus offers a possible downstream carbon-in-pulp (CIP) recovery route hybrid presence cyanide. Given frequent occurrence deposits high levels copper, equilibrium loading copper onto activated cyanide-starved containing studied. Adsorption efficiency was studied isotherms. Results showed that while more sporadic on goodness fit, consistent clearly follows Freundlich isotherm model (good linear correlation log Q vs C values). The isotherms were obtained using concentration 2 ppm. In increases increasing calcium ion concentrations, decreases not affected by initial concentration. cuprous cupric glycinate complexes lowered through competitive (I) adsorbing rapidly than their counterparts. capacity 2 ppm Au 300 ppm Cu, at pH 11 found 9.95 kgAu/toncarbon 24 h, which almost four times higher pure system (2.7 kgAu/toncarbon) under similar conditions. study revealed adsorbent removal cyanide-glycine aqueous solutions.