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An integrated approach for the mitigation of acid rock drainage (ARD) associated with pyrrhotite in nickel deposits
This project identified the possibility of manipulating rejection mechanisms in flotation to produce passivated pyrrhotite tailings. Passivation enables surface coating of the sulfide thus inhibiting attack by oxidising agents. Promotion of passivation of pyrrhotite during flotation to produce un-re...
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| Format: | Thesis |
| Language: | English |
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Centre for Bioprocess Engineering Research
2015
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| _version_ | 1867613917107191808 |
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| access_status_str | Open Access |
| author | Chimbganda, Tapiwa |
| author2 | Becker, Megan |
| author_browse | Becker, Megan Chimbganda, Tapiwa |
| author_facet | Becker, Megan Chimbganda, Tapiwa |
| author_sort | Chimbganda, Tapiwa |
| collection | Thesis |
| description | This project identified the possibility of manipulating rejection mechanisms in flotation to produce passivated pyrrhotite tailings. Passivation enables surface coating of the sulfide thus inhibiting attack by oxidising agents. Promotion of passivation of pyrrhotite during flotation to produce un-reactive tailings has not been explored to date. Polyethylene polyamines (DETA/TETA), which are already used as depressants in flotation, have been proved to be effective coating agents, significantly reducing the oxidation of pyrrhotite and pyrite in both abiotic and biotic systems. However, passivation by polyethylene polyamines (DETA and TETA) has only been explored on waste rock and pristine pyrrhotite. Furthermore, studies of the mechanism of oxidation of pyrrhotite have observed the formation of a hydrophilic ferric oxyhydroxide layer which enables depression of pyrrhotite during flotation. This layer has been reported in literature to inhibit the further oxidation of the pyrrhotite surface. Thus passivation can also take advantage of the formation of the ferric oxyhydroxide layer to inhibit further oxidation of the mineral. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/14390 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:43:45.708Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Centre for Bioprocess Engineering Research |
| publisherStr | Centre for Bioprocess Engineering Research |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/14390 An integrated approach for the mitigation of acid rock drainage (ARD) associated with pyrrhotite in nickel deposits Chimbganda, Tapiwa Becker, Megan Bioprocess Engineering This project identified the possibility of manipulating rejection mechanisms in flotation to produce passivated pyrrhotite tailings. Passivation enables surface coating of the sulfide thus inhibiting attack by oxidising agents. Promotion of passivation of pyrrhotite during flotation to produce un-reactive tailings has not been explored to date. Polyethylene polyamines (DETA/TETA), which are already used as depressants in flotation, have been proved to be effective coating agents, significantly reducing the oxidation of pyrrhotite and pyrite in both abiotic and biotic systems. However, passivation by polyethylene polyamines (DETA and TETA) has only been explored on waste rock and pristine pyrrhotite. Furthermore, studies of the mechanism of oxidation of pyrrhotite have observed the formation of a hydrophilic ferric oxyhydroxide layer which enables depression of pyrrhotite during flotation. This layer has been reported in literature to inhibit the further oxidation of the pyrrhotite surface. Thus passivation can also take advantage of the formation of the ferric oxyhydroxide layer to inhibit further oxidation of the mineral. 2015-10-28T05:32:46Z 2015-10-28T05:32:46Z 2012 Master Thesis Masters MSc (Chem Eng) http://hdl.handle.net/11427/14390 eng application/pdf Centre for Bioprocess Engineering Research Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Bioprocess Engineering Chimbganda, Tapiwa An integrated approach for the mitigation of acid rock drainage (ARD) associated with pyrrhotite in nickel deposits |
| thesis_degree_str | Master's |
| title | An integrated approach for the mitigation of acid rock drainage (ARD) associated with pyrrhotite in nickel deposits |
| title_full | An integrated approach for the mitigation of acid rock drainage (ARD) associated with pyrrhotite in nickel deposits |
| title_fullStr | An integrated approach for the mitigation of acid rock drainage (ARD) associated with pyrrhotite in nickel deposits |
| title_full_unstemmed | An integrated approach for the mitigation of acid rock drainage (ARD) associated with pyrrhotite in nickel deposits |
| title_short | An integrated approach for the mitigation of acid rock drainage (ARD) associated with pyrrhotite in nickel deposits |
| title_sort | integrated approach for the mitigation of acid rock drainage ard associated with pyrrhotite in nickel deposits |
| topic | Bioprocess Engineering |
| url | http://hdl.handle.net/11427/14390 |
| work_keys_str_mv | AT chimbgandatapiwa anintegratedapproachforthemitigationofacidrockdrainageardassociatedwithpyrrhotiteinnickeldeposits AT chimbgandatapiwa integratedapproachforthemitigationofacidrockdrainageardassociatedwithpyrrhotiteinnickeldeposits |