Bisceglie, Franco and Civati, Davide and Bonati, Beatrice and Faraci, Francesca Dalia (2017) Reduction of potassium cyanide usage in a consolidated industrial process for gold recovery from wastes and scraps. Journal of cleaner production, 142. pp. 1810-1818.
Full text not available from this repository.Abstract
The main purpose of the present work is to improve the understanding of an industrial process that exploits the synergic action of cyanide ion and three-nitrobenzene-sulphonate for the selective removal of precious metals from various matrices. It has been observed that the cyanide dissolves first gold from the surface, forming dicyanoaurate gold complexes, but this reaction alone is not sufficient to dissolve gold with the observed velocity. A deeper knowledge of the chemical mechanisms can potentially improve the process competitiveness. Important reaction factors have been identified and analyzed. It has been demonstrated that the cyanide amount presently utilized is excessive. Possible reduction products have been also identified. The results can help the search for cyanide reduction and substitution. Yield and velocity optimization, together with a solution toxicity reduction can pave the way to eco-friendly processes for the leaching of noble metals.
| Item Type: | Scientific journal article, Newspaper article or Magazine article |
|---|---|
| Subjects: | Physical sciences > Chemistry Mathematical sciences > Statistics > Applied statistics |
| Department/unit: | Dipartimento tecnologie innovative > Istituto sistemi informativi e networking |
| Depositing User: | Francesca Dalia Faraci |
| Date Deposited: | 02 May 2018 05:38 |
| Last Modified: | 14 Sep 2023 17:00 |
| URI: | http://repository.supsi.ch/id/eprint/9492 |
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