An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa

 

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dc.contributor.advisor Becker, Megan en_ZA
dc.contributor.advisor Broadhurst, Jennifer Lee en_ZA
dc.contributor.advisor Reid, Dave en_ZA
dc.contributor.author Meyer, Nicole Anne en_ZA
dc.date.accessioned 2014-11-14T19:46:59Z
dc.date.available 2014-11-14T19:46:59Z
dc.date.issued 2014 en_ZA
dc.identifier.citation Meyer, N. 2014. An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/9610
dc.description Includes bibliographical references. en_ZA
dc.description.abstract Carbon sequestration through mineral carbonation is becoming an increasingly attractive alternative for mitigating excess CO₂ in the atmosphere. Mineral carbonation is a natural process whereby CO₂ is fixed to CaFeMg-silicates to form Ca-, Fe-, and Mg-carbonates. This process is thermodynamically favourable and the products are benign and stable over millions of years. Pyroxene-rich tailings generated from the processing of PGM ores in South Africa have the potential to sequester significant amounts of CO₂ (~14 Mt per annum). In the indirect pH swing method, silicate minerals are initially leached at low pH and then carbonated at high pH. A previous study on these tailings highlighted the slow extraction of cations from orthopyroxene, the major Mg-host. The low reactivity of the orthopyroxene resulted in an overall low conversion of tailings to carbonates with only 30 % for Ca, 3 % for Mg and 9 % for Fe. Under similar experimental leach conditions, ~100 % dissolution of olivine and serpentine can be achieved. en_ZA
dc.language.iso eng en_ZA
dc.title An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa 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 en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Meyer, N. A. (2014). <i>An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering. Retrieved from http://hdl.handle.net/11427/9610 en_ZA
dc.identifier.chicagocitation Meyer, Nicole Anne. <i>"An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2014. http://hdl.handle.net/11427/9610 en_ZA
dc.identifier.vancouvercitation Meyer NA. An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2014 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/9610 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Meyer, Nicole Anne AB - Carbon sequestration through mineral carbonation is becoming an increasingly attractive alternative for mitigating excess CO₂ in the atmosphere. Mineral carbonation is a natural process whereby CO₂ is fixed to CaFeMg-silicates to form Ca-, Fe-, and Mg-carbonates. This process is thermodynamically favourable and the products are benign and stable over millions of years. Pyroxene-rich tailings generated from the processing of PGM ores in South Africa have the potential to sequester significant amounts of CO₂ (~14 Mt per annum). In the indirect pH swing method, silicate minerals are initially leached at low pH and then carbonated at high pH. A previous study on these tailings highlighted the slow extraction of cations from orthopyroxene, the major Mg-host. The low reactivity of the orthopyroxene resulted in an overall low conversion of tailings to carbonates with only 30 % for Ca, 3 % for Mg and 9 % for Fe. Under similar experimental leach conditions, ~100 % dissolution of olivine and serpentine can be achieved. DA - 2014 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2014 T1 - An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa TI - An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa UR - http://hdl.handle.net/11427/9610 ER - en_ZA


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