Huan Li, Elsayed Oraby
This study presents the novel idea of a cyanide-free leaching method, i.e., glycine-ammonia leaching in the presence of permanganate, to treat a low-grade and copper-bearing gold tailing. Ammonia played a key role as a pH modifier, lixiviant and potential catalyst (as cupric ammine) in this study. Replacing ammonia with other pH modifiers (i.e., sodium hydroxide or lime) made the extractions infeasibly low (<30%). The increased additions of glycine (23–93 kg/t), ammonia (30–157 kg/t) and permanganate (5–20 kg/t) enhanced gold and copper extractions considerably. Increasing the solids content from 20 to 40% did not make any obvious changes to copper extraction. However, gold leaching kinetics was slightly better at lower solids content. It was indicated that the staged addition of permanganate was unnecessary under the leaching conditions. Recovery of gold by CIL was shown to be feasible, and it improved gold extraction by 15%, but no effect was observed for copper extraction. Percentages of 76.5% gold and 64.5% copper were extracted in 48 h at 20 g/L glycine, 10 kg/t permanganate, 20 g/L carbon, pH 10.5 and 30% solids. Higher extractions could be potentially achieved by further optimization on the leaching of chalcopyrite in a glycine medium.
@article{f02c1ff4-3950-417d-a75c-4c68405fdf6b,
title={Extraction of Gold and Copper from Flotation Tailings Using Glycine-Ammonia Solutions in the Presence of Permanganate},
author={Huan Li and Elsayed Oraby},
year={2022},
language={en}
}TY - JOUR TI - Extraction of Gold and Copper from Flotation Tailings Using Glycine-Ammonia Solutions in the Presence of Permanganate AU - Huan Li AU - Elsayed Oraby PY - 2022 LA - en ER -
Huan Li, Elsayed Oraby, Jacques Eksteen
Waste printed circuit boards (WPCBs) are a complicated and valuable fraction of electric and electronic waste. The recycling of them is critical to av
B.C. Tanda, E.A. Oraby, J.J. Eksteen
Glycine solutions in an alkaline environment have been shown to be able to leach copper from its oxide, native and sulfide minerals as a copper glycin
J. J. Eksteen, E. A. Oraby, B. C. Tanda, P. J. Tauetsile, G. A. Bezuidenhout, T. Newton, F. Trask & I. Bryan, B. C. Tanda a, F. Trask and I. Bryan
The technology to selectively leach gold, silver and base metals from ores, concentrates, and wastes, using an alkaline glycine solution, has initiat
Ionela Birloaga, Ida De Michelis, Francesco Ferella, Mihai Buzatu, Francesco Vegliò
This study investigates the hydrometallurgical recovery of copper and gold from waste printed circuit boards (WPCBs) using a sequential oxidative leac
The leachability tests for manufacturing scrap TV boards (STVB) have indicated the release of metals beyond the limit levels with potential problems f