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Aqueous behaviour of cobalt in the presence of copper, iron and sulphur dioxide with and without microwave processing

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dc.contributor.advisor Dr. B.B. Mamba Prof. A.F. Mulaba Bafubiandi en
dc.contributor.author Ndalamo, John
dc.date.accessioned 2009-05-19T07:40:16Z
dc.date.available 2009-05-19T07:40:16Z
dc.date.issued 2009-05-19T07:40:16Z
dc.date.submitted 2008-05
dc.identifier.uri http://hdl.handle.net/10210/2558
dc.description M.Tech. en
dc.description.abstract Recent studies have explored the capabilities of sulphur dioxide (SO2), a reducing agent that shows great potential to enhance the leaching efficiency of cobalt from mixed Co-Cu oxidized ores. The research study reported in this dissertation was conducted to further explore the efficacy of SO2 as a suitable reagent to improve the cobalt yield in solution from mixed Co-Cu oxidised ores. Four mixed Co-Cu oxidised ores were used in this study; namely, high cobalt ore (34% Co), low cobalt ore with mica (4% Co), low cobalt ore without mica (3% Co) and high copper ore (0.5% Co). The mechanistic leaching pathways of cobalt from these ores with and without SO2 were investigated and monitored using Ultra-Violet/Visible spectroscopy. Mineralogical studies of these ores was carried out by X - ray diffraction (XRD), X - ray fluorescence (XRF) and flame atomic absorption spectroscopy (AAS). Microwave processing of these ores prior to leaching experiments was also investigated. The experimental work was carried out on a laboratory scale and highlights of results obtained are summarized as follows:  Although not much information pertaining to Co2+ bearing minerals in mixed Co-Cu oxidised ores was derived from XRD results, two forms of heterogenite minerals (CoOOH-2H and CoOOH-3R), which bear cobalt as Co3+ were noted in the low cobalt ores.  High percentage cobalt dissolutions (85% to 95%) were achieved when leaching mixed Co-Cu oxidised ores in the presence of SO2.  UV/Visible spectroscopy confirmed concentrations of Co3+ and Co2+ before and after SO2 treatment of mixed Co-Cu oxidised ores.  Percentage cobalt dissolutions improved by 10% to 20% in microwave irradiated mixed Co-Cu oxidised ores  The presence of iron and copper in leach solutions can limit the dissolution of cobalt from mixed Co-Cu oxidised ores to a certain extent. en
dc.language.iso en en
dc.subject Cobalt en
dc.subject Leaching en
dc.title Aqueous behaviour of cobalt in the presence of copper, iron and sulphur dioxide with and without microwave processing en
dc.type Thesis en

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