Oxidation of arsenite (As(III)) by ferric iron in the presence of pyrite and a mixed moderately thermophilic culture

Qin, Wenqing, Liu, Kai, Diao, Mengxue, Wang, Jun, Zhang, Yansheng, Yang, Congren and Jiao, Fen (2013) Oxidation of arsenite (As(III)) by ferric iron in the presence of pyrite and a mixed moderately thermophilic culture. Hydrometallurgy, 137 53-59. doi:10.1016/j.hydromet.2013.05.011


Author Qin, Wenqing
Liu, Kai
Diao, Mengxue
Wang, Jun
Zhang, Yansheng
Yang, Congren
Jiao, Fen
Title Oxidation of arsenite (As(III)) by ferric iron in the presence of pyrite and a mixed moderately thermophilic culture
Journal name Hydrometallurgy   Check publisher's open access policy
ISSN 0304-386X
1879-1158
Publication date 2013-05
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.hydromet.2013.05.011
Open Access Status
Volume 137
Start page 53
End page 59
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2014
Language eng
Formatted abstract
The oxidation of As(III) by Fe3 + in the presence of pyrite and a mixed moderately thermophilic culture with high As(III)-resistance was investigated under various conditions. The oxidation of As(III) took place on the pyrite surface, and in the presence of excessive Fe3 + the reaction could be classified as a zero-order reaction or a first-order reaction, which depended on whether or not the catalytic sites on the pyrite surface were saturated by As(III). The rate constant of the first-order reaction, 0.0214 h− 1, was calculated from the experimental data, and the rate constant of zero-order reaction was correlated to the pulp density of pyrite. A simple model was built to model the change of As(III) concentration during the biooxidation of arsenic bearing gold concentrates. The model showed that when the content of As in the concentrate was less than 11.4% (w/v) and that of pyrite was more than 60%, the As(III) level in the solution did not significantly increase over time.
Keyword Arsenite
Biooxidation
Pyrite
Arsenic-bearing gold concentrate
Moderate thermophiles
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 2014 Collection
 
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Created: Sun, 08 Sep 2013, 00:04:54 EST by System User on behalf of School of Chemical Engineering