Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit

 

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dc.contributor.advisor Petersen, Jochen en_ZA
dc.contributor.author Taggart, Diane en_ZA
dc.date.accessioned 2016-07-13T07:45:51Z
dc.date.available 2016-07-13T07:45:51Z
dc.date.issued 2016 en_ZA
dc.identifier.citation Taggart, D. 2016. Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/20326
dc.description.abstract 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. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Chemical Engineering en_ZA
dc.subject.other Minerals Research en_ZA
dc.subject.other Hydrometallurgy en_ZA
dc.title Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Department of Chemical Engineering en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc (Eng) en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Taggart, D. (2016). <i>Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering. Retrieved from http://hdl.handle.net/11427/20326 en_ZA
dc.identifier.chicagocitation Taggart, Diane. <i>"Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2016. http://hdl.handle.net/11427/20326 en_ZA
dc.identifier.vancouvercitation Taggart D. Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2016 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/20326 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Taggart, Diane AB - 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. DA - 2016 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2016 T1 - Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit TI - Evaluating the effect of alternative neutralising agent and seeding on the zinc recovery through the Zincor iron removal circuit UR - http://hdl.handle.net/11427/20326 ER - en_ZA


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