Article ; Online: Cyanide within gold mine waste of the free state goldfields: A geochemical modelling approach.
Environmental pollution (Barking, Essex : 1987)
2022 Volume 318, Page(s) 120825
Abstract: Cyanide, which remains the preferred chemical used in the gold extraction process, has the potential to be disposed of on goldmine tailings. South Africa has nine goldfields, producing approximately a third of the world's gold to date. The cyanide ... ...
| Abstract | Cyanide, which remains the preferred chemical used in the gold extraction process, has the potential to be disposed of on goldmine tailings. South Africa has nine goldfields, producing approximately a third of the world's gold to date. The cyanide interacts with metals in the tailings environment, where Prussian blue [Formula: see text] and Turnbull's blue [Formula: see text] are among these. In previous studies, Prussian blue or Turnbull's blue have been found as a blue substance in tailings material. PHREEQC modelling software was used adding the mineralogical data from 16 tailings samples from the Free State goldfield. The results revealed that Prussian blue prefers to precipitate in an oxic environment and Turnbull's blue prefers an anoxic environment. It was also determined that their precipitation is affected by the availability of iron in solution. As soon as all of the iron is consumed in solution, all excess cyanide produces HCN, which is a free cyanide which volatilizes. Contrarily, Prussian and Turnbull's blue are CN |
|---|---|
| Language | English |
| Publishing date | 2022-12-08 |
| Publishing country | England |
| Document type | Journal Article |
| ZDB-ID | 280652-6 |
| ISSN | 1873-6424 ; 0013-9327 ; 0269-7491 |
| ISSN (online) | 1873-6424 |
| ISSN | 0013-9327 ; 0269-7491 |
| DOI | 10.1016/j.envpol.2022.120825 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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