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The ferric leaching of pyrite
Bibliography: pages 82-90.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2016
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| _version_ | 1867613253871337472 |
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| access_status_str | Open Access |
| author | May, Noelene |
| author2 | Hansford, Geoffrey Spearing |
| author_browse | Hansford, Geoffrey Spearing May, Noelene |
| author_facet | Hansford, Geoffrey Spearing May, Noelene |
| author_sort | May, Noelene |
| collection | Thesis |
| description | Bibliography: pages 82-90. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/17952 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:12.104Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Chemical Engineering |
| publisherStr | Department of Chemical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/17952 The ferric leaching of pyrite May, Noelene Hansford, Geoffrey Spearing Chemical Engineering Bibliography: pages 82-90. 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. 2016-03-17T12:42:26Z 2016-03-17T12:42:26Z 1997 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/17952 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering May, Noelene The ferric leaching of pyrite |
| thesis_degree_str | Master's |
| title | The ferric leaching of pyrite |
| title_full | The ferric leaching of pyrite |
| title_fullStr | The ferric leaching of pyrite |
| title_full_unstemmed | The ferric leaching of pyrite |
| title_short | The ferric leaching of pyrite |
| title_sort | ferric leaching of pyrite |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/17952 |
| work_keys_str_mv | AT maynoelene theferricleachingofpyrite AT maynoelene ferricleachingofpyrite |