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Metal mobilization from complex sulfide ore concentrate: Effect of light and pH

Tsang, Jeffrey J. and Parry, David L. (2004). Metal mobilization from complex sulfide ore concentrate: Effect of light and pH. Australian Journal of Chemistry: an international journal for chemical science,57(10):971-978.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 1 times in Scopus Article | Citations

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Title Metal mobilization from complex sulfide ore concentrate: Effect of light and pH
Author Tsang, Jeffrey J.
Parry, David L.
Journal Name Australian Journal of Chemistry: an international journal for chemical science
Publication Date 2004
Volume Number 57
Issue Number 10
ISSN 0004-9425   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-8344259102
Start Page 971
End Page 978
Total Pages 8
Place of Publication Australia
Publisher CSIRO Publishing
Field of Research CHEMICAL SCIENCES
0402 - Geochemistry
HERDC Category C1 - Journal Article (DEST)
Abstract The aim of this study was to determine the influence of photo-irradiation and pH on the mobilization of metals from a complex sulfide ore concentrate containing known semiconductors (PbS, ZnS, CdS, FeS2, and CuFeS2). The mobilization of Zn, Fe, and Cd increased under illumination, which is attributed to the semiconductor nature of ZnS, FeS2, and CdS, respectively. An increase in mobilization of Zn, Fe, and Cd under light is observed with decreasing pH, because of increased surface protonation and the greater oxidizing property of photoholes. The semiconductor nature of PbS and CuFeS2 is observed at pH 2. However, at higher pH the concentrations of mobilized Pb and Cu are greater in darkness than under illumination. This is attributed to the light enhanced exchange reactions involving dissolved Pb and Cu with metal sulfides more soluble than PbS and CuS.
Keywords photooxidative dissolution
semiconductor electrochemistry
surface-reactions
pyrite oxidation
ion-exchange
kinetics
degradation
mechanisms
sphalerite
DOI http://dx.doi.org/10.1071/CH04081   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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