E.A. Oraby, J.J. Eksteen
In the context of gold extraction from copper-gold ores via cyanidation, this study investigates the challenges posed by copper minerals, which can result in gold losses and cyanide consumption. The objective of this research is to present a method that enhances gold dissolution using cyanide-starved copper-cyanide solutions in the presence of glycine. The methodology involves evaluating the impact of glycine addition on the kinetics of gold leaching under varying conditions. Results indicate that glycine significantly increases the gold dissolution rate in solutions containing copper-cyanide species, illustrating a remarkable difference in rates between the glycine-present scenario (11.1 μmol/m²·s) and the scenario without glycine (0.65 μmol/m²·s). Notably, the average gold dissolution rate in the Cu–CN−-glycine system is approximately 6.5 times greater than that in traditional cyanidation processes. Further kinetic and electrochemical studies demonstrate that factors such as glycine concentration, pH levels, and copper concentration ratios notably affect gold dissolution, with an optimal glycine concentration of up to 1 g/L enhancing the process, while increases in pH level up to 12 also promote dissolution, though levels beyond 13 inhibit it.
@article{ff24f3b6-6c1d-424a-b5ec-ad41c1a5020a,
title={Gold leaching in cyanide-starved copper solutions in the presence of glycine},
author={E.A. Oraby and J.J. Eksteen},
year={2015},
language={en}
}TY - JOUR TI - Gold leaching in cyanide-starved copper solutions in the presence of glycine AU - E.A. Oraby AU - J.J. Eksteen PY - 2015 LA - en ER -
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