E.A. Oraby, J.J. Eksteen
The presence of copper minerals with gold poses significant challenges during the cyanidation of gold ores, often resulting in elevated cyanide consumption and reduced gold extraction. This study investigates an alternative selective leaching process aimed at separating copper from a copper-gold concentrate (containing 3.75% Cu, 11.6% Fe, 11.4% S, and 0.213% Au) using alkaline glycine solutions. A lixiviant system comprising glycine and peroxide was evaluated, demonstrating a remarkable total copper dissolution of 98% achieved within 48 hours at ambient conditions and a pH range of 10.5–11. Notably, the dissolution rates showed that 100% of chalcocite, cuprite, metallic copper, and approximately 80% of chalcopyrite were effectively leached. Meanwhile, pyrite remained unaffected during the leaching process. The final pregnant solution showcased a copper concentration of 4745 mg/L, accompanied by a low gold concentration of 0.8 mg/L. QEMScan analysis revealed that the remaining copper in the leach residue was primarily located within larger chalcopyrite grains and covellite. The study also explored the roles of various factors, including single versus two-stage leaching, pH, oxidant concentration, pulp density, and glycine concentration, on copper extraction efficiency.
@article{f78637c3-c388-45f7-9f2f-430de163f7b8,
title={The selective leaching of copper from a gold–copper concentrate in glycine solutions},
author={E.A. Oraby and J.J. Eksteen},
year={2014},
language={en}
}TY - JOUR TI - The selective leaching of copper from a gold–copper concentrate in glycine solutions AU - E.A. Oraby AU - J.J. Eksteen PY - 2014 LA - en ER -
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