An in situ chronoamperometry/synchrotron radiation grazing incidence X-ray diffraction study of the electrochemical oxidation of pyrite in chloride media

Roland De Marco; S Bailey; Z T Jiang; J Morton; R Chester

doi:10.1016/j.elecom.2006.07.036

$An in situ chronoamperometry/synchrotron radiation grazing incidence X-ray diffraction study of the electrochemical oxidation of pyrite in chloride media$

Journal article

Peer reviewed

An in situ chronoamperometry/synchrotron radiation grazing incidence X-ray diffraction study of the electrochemical oxidation of pyrite in chloride media

Roland De Marco, S Bailey, Z T Jiang, J Morton and R Chester

Electrochemistry Communications, Vol.8(10), pp.1661-1664

2006

DOI: https://doi.org/10.1016/j.elecom.2006.07.036

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Abstract

Physical Chemistry (incl. Structural)

electrochemical oxidation

chronoamperometry

pyrite

synchrotron radiation grazing incidence X-ray diffraction

The influence of chloride on the electrochemical oxidation of pyrite has been studied using a combination of chronoamperometry (CA) and in situ synchrotron radiation grazing incidence X-ray diffraction (SR-GIXRD). The SR-GIXRD data revealed that the electrochemical oxidation of pyrite at 0.4 V vs. a psuedo stainless steel reference electrode induced the formation of crystalline FeSO4, Fe(OH)SO4 · 2H2O and Fe(OH)2 with an almost total extinction of the underlying pyrite. Similar patterns of oxidation were observed at 0.5 and 0.6 V vs. a pseudo stainless steel reference electrode; however, there was little or no oxidation products evident at 0.7 and 0.8 V vs. a pseudo stainless steel reference electrode. Significantly, in all cases, there was a significant build up in the quantity of amorphous reaction products, as evidenced by an elevation in intensity of the amorphous bump at low 2-theta, and this observation was supported by the visual appearance of the oxidised electrode at 0.7 and 0.8 V vs the pseudo stainless steel reference electrode which showed a “fools gold” appearance. These CA/SR-GIXRD outcomes suggest that oxidation of pyrite in chloride media under alkaline conditions may mildly passivate the electrode, and this may have important ramifications for the processing of pyritic ores in the hydrometallurgical industry.

Details

Title: An in situ chronoamperometry/synchrotron radiation grazing incidence X-ray diffraction study of the electrochemical oxidation of pyrite in chloride media
Authors: Roland De Marco (Author) - Curtin University of Technology
S Bailey (Author) - Curtin University of Technology
Z T Jiang (Author) - Curtin University of Technology
J Morton (Author) - Curtin University of Technology
R Chester (Author) - Curtin University of Technology
Publication details: Electrochemistry Communications, Vol.8(10), pp.1661-1664
Publisher: Elsevier Inc.
Date published: 2006
DOI: 10.1016/j.elecom.2006.07.036
ISSN: 1388-2481
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99449707902621
Output Type: Journal article

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