Physical and chemical analysis of elemental sulfur formation during galena surface oxidation

Hampton, Marc A., Plackowski, Chris and Nguyen, Anh V. (2011) Physical and chemical analysis of elemental sulfur formation during galena surface oxidation. Langmuir, 27 7: 4190-4201. doi:10.1021/la104755a


Author Hampton, Marc A.
Plackowski, Chris
Nguyen, Anh V.
Title Physical and chemical analysis of elemental sulfur formation during galena surface oxidation
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
1520-5827
Publication date 2011-04-05
Sub-type Article (original research)
DOI 10.1021/la104755a
Volume 27
Issue 7
Start page 4190
End page 4201
Total pages 12
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2012
Language eng
Abstract The surface oxidation of sulfide minerals, such as galena (PbS), in aqueous solutions is of critical importance in a number of applications. A comprehensive understanding of the formation of oxidation species at the galena surface is still lacking. Much controversy over the nature of these oxidation products exists. A number of oxidation pathways have been proposed, and experimental evidence for the formation of elemental sulfur, metal polysulfides, and metal-deficient lead sulfides in acidic conditions has been shown and argued. This paper provides further insight into the electrochemical behavior of galena at pH 4.5. Utilizing a novel experimental system that combines in situ electrochemical control and AC mode atomic force microscopy (AFM) surface imaging, the formation and growth of nanoscopic domains on the galena surface are detected and examined at anodic potentials. AFM phase images indicate that these domains have different material properties to the underlying galena. Continued oxidation results in nanoscopic pitting and the formation of microscopic surface domains, which are confirmed to be elemental sulfur by Raman spectroscopy. Further clarification of the presence of elemental sulfur is provided by Cryo-XPS. Polysulfide and metal-deficient sulfide could not be detected within this system.
Keyword Lead sulfide
Polysulfides
Concentrate
Chalcopyrite
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
 
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Created: Wed, 24 Aug 2011, 10:55:50 EST by Mr Marc Hampton on behalf of School of Chemical Engineering