Browsing by Subject "Solvent extraction"
Now showing items 1-10 of 15
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The cobalt-nickel pertraction refinery to process recycled spent catalysts leach solutions
(North-West University (South Africa), 2019)Over the last two years, the cobalt (Co) price has increased considerably. The observed increase can be attributed to the increase in demand of lithium-ion batteries (LIBs) of which Co forms an integral part. As a consequence ... -
Comparison of extractants for the separation of TaF5 and NbF5 in different acidic media
(Elsevier, 2014)To optimise the solvent extraction (SX) of Ta and Nb, eight different extractants were investigated, including the cation exchangers di-iso-octyl-phosphinic acid (PA) and di-(2-ethylhexyl)-phosphoric acid (D2EHPA), the ... -
Extraction of uranium from synthetic nuclear conversion plant waste
(Taylor & Francis, 2019)The nuclear conversion plant operated at Necsa in the past resulted in the formation of a large amount of waste material containing ~ 50% U, which has reuse potential if the recovery thereof can be achieved. The waste ... -
Feasibility of thorium extraction from a solid monazite matrix utilizing supercritical CO2 with TBP and HFA as chelates
(2014)With current energy demands globally and locally, nuclear energy remains one of the top competitors for cleaner and sustainable energy. The nuclear industry requires more inherent safety and proliferation resistance in ... -
The hafnium-selective extraction from a zirconium(hafnium) heptafluoride ammonium solution using organophosphorus-based extractants
(Taylor & Francis, 2018)The suitability of the organophosphorus-based extractants, DiOPA, Ionquest 801 and D2EHPA was evaluated for the selective extraction of Zr and Hf from an (NH4)3Zr(Hf)F7 acidic solution using both dispersive and pertraction ... -
Mechanistic study of hafnium and zirconium extraction with organophosphorus extractants
(Taylor & Francis, 2018)Research on the purification of Zr has increased in the last few decades and although effective processes have been developed, little is known about the mechanism of Hf and Zr extraction; particularly, at low acid ... -
Molecular modelling of species pertaining to the solvent extraction of tantalum penta-fluorides
(North-West University, 2018)Solvent extraction (SX) is used for the separation and purification of various metals, including tantalum (Ta) and niobium (Nb). Industrial processes for the separation of Ta and Nb traditionally use high concentrations ... -
Molecular modelling of tantalum in an aqueous phase
(SAIMM, 2017)The transition metals tantalum (Ta) and niobium (Nb) are of significant importance, for example in the nuclear energy sector where they are used as cladding materials, as well as in capacitors and specialized materials. For ... -
The selective extraction of Hf from Zr(Hf)Cl4(aq) using organophosphorous derivatives
(North-West University (South Africa), 2015)While traditional solvent extraction (SX) separations of Zr and Hf focus on the preferential extraction of Zr (majority solute) from Hf (minority solute), the aim of this study was to ascertain whether the selective ... -
Selective membrane based solvent extraction of Hf from a (NH4)3Zr(Hf)F7 solution
(North-West University (South Africa), Potchefstroom Campus, 2016)Zr and Hf, which co-exist in nature, have similar chemical properties, except for their Zr and Hf, which co-exist in nature, have similar chemical properties, except for their absorbance of neutrons which implies that Zr ...