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dc.contributor.authorVan der Westhuizen, Derik J.
dc.contributor.authorDe Beer, Leon
dc.contributor.authorUngerer, Marietjie J.
dc.contributor.authorKrieg, Henning M.
dc.date.accessioned2016-07-25T14:04:08Z
dc.date.available2016-07-25T14:04:08Z
dc.date.issued2014
dc.identifier.citationDe Beer, L. et al. 2014. The time dependent solvent extraction of Ta and Nb. AMI Light Metals Conference 2014. Advanced materials research, 1019:433-438. [https://doi.org/10.4028/www.scientific.net/AMR.1019.433]en_US
dc.identifier.issn1022-6680
dc.identifier.issn1662-8985 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/18048
dc.identifier.urihttps://doi.org/10.4028/www.scientific.net/AMR.1019.433
dc.identifier.urihttps://www.scientific.net/AMR.1019.433
dc.description.abstractThe suitability of Liquid-liquid extraction (LLE) for the selective extraction of chemically similar tantalum (Ta) and niobium (Nb) mixtures was investigated by determining the influence of the acid concentration, extractant to metal mole ratio (E:M) as well as the ageing of the feed on extraction using the extractants, bis (2-ethylhexyl) phosphate (D2EHPA) and di-iso-octylphosphinic acid (PA). The system consisted of a solvent in varying E:M ratio’s, diluted in cyclohexane with 3% (v\v) 1-octanol added as modifier and a feed solution containing sulphuric acid and 100 ppm of the NH4TaF6 and NH4NbF6 complexes. Depending on the acid concentration, extraction percentages (%E) of up to 100% for Ta and 10-20% for Nb were attained. An initial lack of repeatability in experimental results was shown to be caused by variations in the age of the feed solution. The change in extraction trends expressed as a normalized %E for the aged feed solutions were nearly identical for both extractants when using 3, 6, 9 and 14mol/dm3 H2SO4. For the 3 and 6mol/dm3 solutions, the %E decreased significantly within the first 4-5 hours of ageing. At 9mol/dm3 the %E remained stable for feed ages up to 3.5 hours before declining, while the %E remained near constant at 14mol/dm3even after ageing for 24 hoursen_US
dc.language.isoenen_US
dc.publisherTrans Tech Publicationsen_US
dc.subjectBis (2-ethylhexyl) Phosphateen_US
dc.subjectBis(2,4,4-trimethylpentyl)phosphinic aciden_US
dc.subjectD2EHPAen_US
dc.subjectDi-iso-octylphosphinic aciden_US
dc.subjectLiquid-liquid extractionen_US
dc.subjectNiobiumen_US
dc.subjectSolvent extractionen_US
dc.subjectTantalumen_US
dc.titleThe time dependent solvent extraction of Ta and Nben_US
dc.title.alternativeAMI Light Metals Conference 2014en_US
dc.typePresentationen_US
dc.contributor.researchID12839981 - Van der Westhuizen, Derik Jacobus
dc.contributor.researchID11087137 - Krieg, Henning Manfred
dc.contributor.researchID20068980 - Ungerer, Maria Johanna
dc.contributor.researchID21230277 - De Beer, Leon


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