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- Title
Lead Oxide Enhances the Leaching of Gold in Cyanide Tailings.
- Authors
Yang, Wei; Dong, Hua; Cao, Huan; Long, Tao; Deng, Sha; Wan, He
- Abstract
Cyanidation tailings often contain a certain amount of gold, which is difficult to recover due to the influence of associated minerals. In this article, lead oxide was used to increase leaching efficiency and decrease sodium cyanide consumption. The mechanism of lead oxide-enhanced gold leaching was studied by thermodynamic calculation, SEM and XPS analysis. One of the reasons for low conventional leaching rate of gold in cyanide tailings is that the residual cyanide in tailings makes gold react with the sulfide of associated iron (pyrrhotite, etc.) to form Au/Sx passivation film. The mechanism of enhanced leaching of lead oxide is that it reacts with the passivation film to form soluble salts and participates in leaching as an oxidant. There is electric potential difference between gold and the reduction product of lead oxide, which can form a primary battery to cause contact corrosion and effectively improve the gold extraction. Therefore, it has a wide application prospect to add enhanced leaching reagent to improve gold extraction of cyanide leaching tailings.
- Subjects
METAL tailings; VOLTAGE; LEACHING; CYANIDES; LEAD oxides; PYRRHOTITE; SODIUM cyanide
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 2, p301
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-022-05602-8