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Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit
Zincor's average zinc recovery was 90.29 % (for the period of 1 January 2009 to 30 September 2011), which was well below the industry standard of 96 %. Due to limitations in Zincor's iron removal technology, the maximum achievable recovery was 94 %. The zinc loss through the iron residue was the sec...
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| Language: | English |
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Department of Chemical Engineering
2016
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| _version_ | 1867613142738010112 |
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| access_status_str | Open Access |
| author | Taggart, Diane |
| author2 | Petersen, Jochen |
| author_browse | Petersen, Jochen Taggart, Diane |
| author_facet | Petersen, Jochen Taggart, Diane |
| author_sort | Taggart, Diane |
| collection | Thesis |
| description | Zincor's average zinc recovery was 90.29 % (for the period of 1 January 2009 to 30 September 2011), which was well below the industry standard of 96 %. Due to limitations in Zincor's iron removal technology, the maximum achievable recovery was 94 %. The zinc loss through the iron residue was the second biggest contributor to the overall zinc losses, so that there was much room for improvement. The calcine used for neutralisation in the Iron Removal Stage contained a portion of insoluble zinc ferrite. The insoluble zinc loss through the iron residue was associated with the presence of the insoluble zinc ferrite, as well as the phenomenon of coating of unleached neutralising agent by iron precipitate. The soluble zinc loss was a function of the dewatering characteristics of the precipitate. The work included the evaluation of alternative neutralising agents to supplement or replace calcine, as well as the implementation of a seed recycle. A review of literature found that the use of an alternative neutralising agent that contained little or no zinc could potentially reduce the insoluble portion of the zinc loss. Secondly, the presence of seed could potentially reduce both the soluble and insoluble zinc losses by promoting agglomeration growth and providing additional surface area for precipitation to occur (thereby reducing coating of zinc-rich neutralising agents). The laboratory work evaluated a number of alternative neutralising agents, but focused on the use of DRC oxide and limestone for neutralisation. These were evaluated separately and in combination, with and without a seed recycle. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/20326 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:26.417Z |
| 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:11427/20326 Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit Taggart, Diane Petersen, Jochen Chemical Engineering Minerals Research Hydrometallurgy Zincor's average zinc recovery was 90.29 % (for the period of 1 January 2009 to 30 September 2011), which was well below the industry standard of 96 %. Due to limitations in Zincor's iron removal technology, the maximum achievable recovery was 94 %. The zinc loss through the iron residue was the second biggest contributor to the overall zinc losses, so that there was much room for improvement. The calcine used for neutralisation in the Iron Removal Stage contained a portion of insoluble zinc ferrite. The insoluble zinc loss through the iron residue was associated with the presence of the insoluble zinc ferrite, as well as the phenomenon of coating of unleached neutralising agent by iron precipitate. The soluble zinc loss was a function of the dewatering characteristics of the precipitate. The work included the evaluation of alternative neutralising agents to supplement or replace calcine, as well as the implementation of a seed recycle. A review of literature found that the use of an alternative neutralising agent that contained little or no zinc could potentially reduce the insoluble portion of the zinc loss. Secondly, the presence of seed could potentially reduce both the soluble and insoluble zinc losses by promoting agglomeration growth and providing additional surface area for precipitation to occur (thereby reducing coating of zinc-rich neutralising agents). The laboratory work evaluated a number of alternative neutralising agents, but focused on the use of DRC oxide and limestone for neutralisation. These were evaluated separately and in combination, with and without a seed recycle. 2016-07-13T07:45:51Z 2016-07-13T07:45:51Z 2016 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/20326 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Minerals Research Hydrometallurgy Taggart, Diane Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit |
| thesis_degree_str | Master's |
| title | Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit |
| title_full | Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit |
| title_fullStr | Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit |
| title_full_unstemmed | Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit |
| title_short | Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit |
| title_sort | evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the zincor iron removal circuit |
| topic | Chemical Engineering Minerals Research Hydrometallurgy |
| url | http://hdl.handle.net/11427/20326 |
| work_keys_str_mv | AT taggartdiane evaluatingtheeffectofalternativeneutralisingagentandseedingonthezincrecoverythroughthezincorironremovalcircuit |