Electrodeposition on pyrite from copper(I) cyanide electrolyte

Guo, B. (2016) Electrodeposition on pyrite from copper(I) cyanide electrolyte. RSC Advances, 6 3: 2183-2190. doi:10.1039/c5ra23948f

Author Guo, B.
Title Electrodeposition on pyrite from copper(I) cyanide electrolyte
Journal name RSC Advances   Check publisher's open access policy
ISSN 2046-2069
Publication date 2016
Sub-type Article (original research)
DOI 10.1039/c5ra23948f
Open Access Status Not Open Access
Volume 6
Issue 3
Start page 2183
End page 2190
Total pages 8
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2015
Language eng
Formatted abstract
Cyanide and copper often co-exist in process water with complicated speciation. The deposition of copper on pyrite from cyanide bearing solutions is unknown and is the objective of this study. The electrochemical behaviour of pyrite in a solution with CN/Cu mole ratio of 3/1 has been investigated in different solution pH values. It was found that, at pH 7, cuprous cyanide can be oxidized to Cu(II) oxide/hydroxide which deposit on the pyrite surface and transform to Cu(I)-sulfide during the subsequent cathodic sweeping. However, this anodic deposition process is inhibited either at pH 10 due to the dissolution of solid Cu(II)/Cu(I)-species by Cu(CN)32−, or at pH 5 due to the high solubility of Cu(II) oxide/hydroxide. On the other hand, Cu(CN)2− can be deposited onto pyrite, forming a Cu(I)-sulfide layer at more reducing potentials. The understanding of the electrodeposition mechanisms provides opportunities for the recovery of copper from cyanide-bearing waste water, as well as the separation of pyrite from other raw materials by altering its surface properties.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Published online 22 December 2015

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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