The ferric leaching of pyrite

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dc.contributor.advisorHansford, Geoffrey Spearingen_ZA
dc.contributor.authorMay, Noeleneen_ZA
dc.date.accessioned2016-03-17T12:42:26Z
dc.date.available2016-03-17T12:42:26Z
dc.date.issued1997en_ZA
dc.descriptionBibliography: pages 82-90.en_ZA
dc.description.abstractThe bioleaching of pyrite has been found to occur via an indirect mechanism. Ferric iron leaches the pyrite, and is reduced to ferrous iron. Bacteria such as Thiobacillus ferrooxidans oxidise the ferrous iron to ferric iron, thus maintaining a high redox potential. In this thesis, the effect of the redox potential on the ferric leach rate was investigated by examining previously published data and by developing an experimental technique where dynamic redox potential measurements were used to study the kinetics of the sub-process. The ferric leach rate of pyrite was found to be of the order of 5 x 10⁻⁷ moles pyrite per mole pyrite per second, which is of the same order of magnitude as rates reported for the bioleaching of pyrite over similar ranges of redox potential. The rate decreased as the redox potential decreased, in what appeared to be a Butler-Volmer-like manner. This, along with the observation that there was no significant effect of the total iron concentration, suggested the likelihood of an electrochemical mechanism being operative, with charge transfer at the pyrite surface being rate limiting.en_ZA
dc.identifier.apacitationMay, N. (1997). <i>The ferric leaching of pyrite</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering. Retrieved from http://hdl.handle.net/11427/17952en_ZA
dc.identifier.chicagocitationMay, Noelene. <i>"The ferric leaching of pyrite."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 1997. http://hdl.handle.net/11427/17952en_ZA
dc.identifier.citationMay, N. 1997. The ferric leaching of pyrite. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - May, Noelene AB - The bioleaching of pyrite has been found to occur via an indirect mechanism. Ferric iron leaches the pyrite, and is reduced to ferrous iron. Bacteria such as Thiobacillus ferrooxidans oxidise the ferrous iron to ferric iron, thus maintaining a high redox potential. In this thesis, the effect of the redox potential on the ferric leach rate was investigated by examining previously published data and by developing an experimental technique where dynamic redox potential measurements were used to study the kinetics of the sub-process. The ferric leach rate of pyrite was found to be of the order of 5 x 10⁻⁷ moles pyrite per mole pyrite per second, which is of the same order of magnitude as rates reported for the bioleaching of pyrite over similar ranges of redox potential. The rate decreased as the redox potential decreased, in what appeared to be a Butler-Volmer-like manner. This, along with the observation that there was no significant effect of the total iron concentration, suggested the likelihood of an electrochemical mechanism being operative, with charge transfer at the pyrite surface being rate limiting. DA - 1997 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1997 T1 - The ferric leaching of pyrite TI - The ferric leaching of pyrite UR - http://hdl.handle.net/11427/17952 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17952
dc.identifier.vancouvercitationMay N. The ferric leaching of pyrite. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 1997 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17952en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Chemical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherChemical Engineeringen_ZA
dc.titleThe ferric leaching of pyriteen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMSc (Eng)en_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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