Potential of thermophilic bioleaching, effect of temperature on the process performance

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dc.contributor.advisorHarrison, STLen_ZA
dc.contributor.authorArcher, Karen H Len_ZA
dc.date.accessioned2014-11-10T09:03:23Z
dc.date.available2014-11-10T09:03:23Z
dc.date.issued1997en_ZA
dc.descriptionIncludes bibliographies.en_ZA
dc.description.abstractBioleaching is a biohydrometallurgical process whereby mineral sulphides are metabolically oxidised by microorganisms, releasing precious metals encapsulated in them. This pre-treatment is based on the action of microorganisms affecting oxidation of reduced sulphur species and ferrous iron to sulphate and ferric iron respectively. Conventionally Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans are implemented in this process in the region of 40-45°C and pH 1.8. A high temperature (65- 800C) process, utiltising thermophilic archaea such as Sulfolobus spp. can be considered as an alternative to current bioleaching practice. Literature indicates that there is an overall increase, 6 fold on average, in the rate of leaching due to the use thermophilic organisms. Bioleaching. involves nutrient transfer to microorganisms and interactions between several ionic species, including iron and sulphate. Thus, it is necessary to investigate the effect of the increased temperature on the gas-liquid mass transfer as well as ionic speciation of the system. Hence, the objectives of the present research were established as follows: to elucidate the effect of temperature on mass transfer from a theoretical point of view to establish whether ionic speciation is a contributing factor in thermophilic bioleaching to develop a generic and flexible means of representing ionic speciesen_ZA
dc.identifier.apacitationArcher, K. H. L. (1997). <i>Potential of thermophilic bioleaching, effect of temperature on the process performance</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/9504en_ZA
dc.identifier.chicagocitationArcher, Karen H L. <i>"Potential of thermophilic bioleaching, effect of temperature on the process performance."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1997. http://hdl.handle.net/11427/9504en_ZA
dc.identifier.citationArcher, K. 1997. Potential of thermophilic bioleaching, effect of temperature on the process performance. University of Cape Town.en_ZA
dc.identifier.risTY - Thesis / Dissertation AU - Archer, Karen H L AB - Bioleaching is a biohydrometallurgical process whereby mineral sulphides are metabolically oxidised by microorganisms, releasing precious metals encapsulated in them. This pre-treatment is based on the action of microorganisms affecting oxidation of reduced sulphur species and ferrous iron to sulphate and ferric iron respectively. Conventionally Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans are implemented in this process in the region of 40-45°C and pH 1.8. A high temperature (65- 800C) process, utiltising thermophilic archaea such as Sulfolobus spp. can be considered as an alternative to current bioleaching practice. Literature indicates that there is an overall increase, 6 fold on average, in the rate of leaching due to the use thermophilic organisms. Bioleaching. involves nutrient transfer to microorganisms and interactions between several ionic species, including iron and sulphate. Thus, it is necessary to investigate the effect of the increased temperature on the gas-liquid mass transfer as well as ionic speciation of the system. Hence, the objectives of the present research were established as follows: to elucidate the effect of temperature on mass transfer from a theoretical point of view to establish whether ionic speciation is a contributing factor in thermophilic bioleaching to develop a generic and flexible means of representing ionic species DA - 1997 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1997 T1 - Potential of thermophilic bioleaching, effect of temperature on the process performance TI - Potential of thermophilic bioleaching, effect of temperature on the process performance UR - http://hdl.handle.net/11427/9504 ER -en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/9504
dc.identifier.vancouvercitationArcher KHL. Potential of thermophilic bioleaching, effect of temperature on the process performance. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1997 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/9504en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentCentre for Bioprocess Engineering Researchen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherBioprocess Engineeringen_ZA
dc.titlePotential of thermophilic bioleaching, effect of temperature on the process performanceen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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