Thermophilic mineral bioleaching performance: a compromise between maximising mineral loading and maximising microbial growth and activity

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dc.contributor.authorSissing, A
dc.contributor.authorHarrison, S T L
dc.date.accessioned2016-08-19T12:04:41Z
dc.date.available2016-08-19T12:04:41Z
dc.date.issued2003
dc.date.updated2016-08-17T12:32:36Z
dc.description.abstractThermophilic bioleaching, conducted at temperatures in excess of 65°C, provides considerable benefit over mesophilic bioleaching, particularly through extending the extent of leaching of base metal minerals such as chalcopyrite. Thermophilic bioleaching is facilitated through a group of micro-organisms known as the Archae, well adapted to extreme environment. In order to maximize the space time utilization of the stirred tank reactor in the thermophilic bioleaching process, it is desirable to maximize the loading of the finely divided mineral phase present while not adversely affecting the microbial performance. In this paper, the effect of the loading of the solid particulate phase on the bioleaching performance of Sulfolobus metallicus was studied in a stirred tank reactor. Emphasis was placed on the effect of the concentration of the finely divided solid phase (35 – 75 µm). A model system comprised of 3% (w/v) pyrite in the presence of varying quantities of quartzite in the range 0 to 24% (w/v) was used to obtain the different solids concentrations. The bioleaching experiments revealed similar bioleaching performance in the presence of 3 to 18% (w/v) total solids. Above 18% (w/v) total solids (15% quartzite loading), bioleaching was impaired progressively with increasing solids concentration. At the highest solids loading studied of 27% (w/v), bioleaching was still observed. In terms of mass transfer, oxygen transfer potential was not significantly influenced in the bioleaching process over the range of solids investigated.en_ZA
dc.identifier.apacitationSissing, A., & Harrison, S. T. L. (2003). Thermophilic mineral bioleaching performance: a compromise between maximising mineral loading and maximising microbial growth and activity. <i>SAIMM Journal</i>, http://hdl.handle.net/11427/21366en_ZA
dc.identifier.chicagocitationSissing, A, and S T L Harrison "Thermophilic mineral bioleaching performance: a compromise between maximising mineral loading and maximising microbial growth and activity." <i>SAIMM Journal</i> (2003) http://hdl.handle.net/11427/21366en_ZA
dc.identifier.citationSissing, A., & Harrison, S. T. L. (2003). Thermophilic mineral bioleaching performance: a compromise between maximizing mineral loading and maximizing microbial growth and activity. Journal of the south African institute of mining and metallurgy, 103(2), 139-142.en_ZA
dc.identifier.issn2411-9717en_ZA
dc.identifier.ris TY - Journal Article AU - Sissing, A AU - Harrison, S T L AB - Thermophilic bioleaching, conducted at temperatures in excess of 65°C, provides considerable benefit over mesophilic bioleaching, particularly through extending the extent of leaching of base metal minerals such as chalcopyrite. Thermophilic bioleaching is facilitated through a group of micro-organisms known as the Archae, well adapted to extreme environment. In order to maximize the space time utilization of the stirred tank reactor in the thermophilic bioleaching process, it is desirable to maximize the loading of the finely divided mineral phase present while not adversely affecting the microbial performance. In this paper, the effect of the loading of the solid particulate phase on the bioleaching performance of Sulfolobus metallicus was studied in a stirred tank reactor. Emphasis was placed on the effect of the concentration of the finely divided solid phase (35 – 75 µm). A model system comprised of 3% (w/v) pyrite in the presence of varying quantities of quartzite in the range 0 to 24% (w/v) was used to obtain the different solids concentrations. The bioleaching experiments revealed similar bioleaching performance in the presence of 3 to 18% (w/v) total solids. Above 18% (w/v) total solids (15% quartzite loading), bioleaching was impaired progressively with increasing solids concentration. At the highest solids loading studied of 27% (w/v), bioleaching was still observed. In terms of mass transfer, oxygen transfer potential was not significantly influenced in the bioleaching process over the range of solids investigated. DA - 2003 DB - OpenUCT DP - University of Cape Town J1 - SAIMM Journal LK - https://open.uct.ac.za PB - University of Cape Town PY - 2003 SM - 2411-9717 T1 - Thermophilic mineral bioleaching performance: a compromise between maximising mineral loading and maximising microbial growth and activity TI - Thermophilic mineral bioleaching performance: a compromise between maximising mineral loading and maximising microbial growth and activity UR - http://hdl.handle.net/11427/21366 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21366
dc.identifier.vancouvercitationSissing A, Harrison STL. Thermophilic mineral bioleaching performance: a compromise between maximising mineral loading and maximising microbial growth and activity. SAIMM Journal. 2003; http://hdl.handle.net/11427/21366.en_ZA
dc.languageengen_ZA
dc.publisherThe Southern African Institute of Mining and Metallurgyen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_ZA
dc.sourceSAIMM Journalen_ZA
dc.source.urihttp://www.saimm.co.za/publications/journal-papers
dc.subject.otherMineral Bioprocess Engineering
dc.titleThermophilic mineral bioleaching performance: a compromise between maximising mineral loading and maximising microbial growth and activityen_ZA
dc.typeJournal Articleen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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