1. Experimental and molecular modeling investigation on adsorption of gold cyanide complex onto the iron oxide and hydroxide minerals.
- Author
-
Arasteh, Aida, Reza Khalesi, Mohammad, and Mohseni, Mehdi
- Subjects
- *
HYDROXIDE minerals , *OXIDE minerals , *GOETHITE , *FERRIC oxide , *GOLD compounds , *FERRIC hydroxides - Abstract
[Display omitted] • Goethite had the highest preg-robbing potential among three studied minerals. • Fe site of FeO(OH) (0 1 0) surface was the most stable adsorption position. • The strongest binding on the FeO(OH) (0 1 0) surface is due to higher stabilization. • P-orbital energy level had higher influence on the adsorption of Au(CN) 2 -. • Molecular modeling confirmed the results of experimental tests. Complex and refractory gold ores contain high amount of iron oxide and hydroxide minerals, potential adsorbents of gold through preg-robbing phenomenon. In this study, density functional theory (DFT) approach was used to investigate the adsorption of A u (C N) 2 - complex on hematite, magnetite, and goethite surfaces. The most stable adsorption occurred for goethite when the A u (C N) 2 - complex was adsorbed from the Au atom along the y axis on the Fe site and the interaction energy was the highest. The following trend was obtained for the preg-robbing potential, which is in good agreement with experiments carried out on synthetic minerals: Goethite > Hematite > Magnetite. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF