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Open AccessFeature PaperArticle

Tantalum and Niobium Selective Extraction by Alkyl-Acetophenone

1
DMRC, CEA Marcoule, 30207 Bagnols sur Cèze CEDEX, France
2
ICSM, CEA, CNRS, ENSCM, Université de Montpellier, 30207 Bagnols sur Cèze CEDEX, France
*
Authors to whom correspondence should be addressed.
Metals 2018, 8(9), 654; https://doi.org/10.3390/met8090654
Received: 30 July 2018 / Revised: 13 August 2018 / Accepted: 16 August 2018 / Published: 21 August 2018
(This article belongs to the Special Issue Solvent Extraction of Critical Metals)
A study has been carried out on Ta and Nb recovery by a liquid-liquid extraction process using 4-methylacetophenone (4-MAcPh) as the organic phase. The 4-MAcPh was compared to methyl isobutyl ketone (MIBK) with respect to extraction efficiencies (D values) at different concentrations of H2SO4 in the aqueous phase. The results showed a similar extraction of Nb for both solvents. However, for Ta, extraction efficiency is increased by a factor of 1.3 for 4-MAcPh. In addition, the MIBK solubilized completely after 6 mol∙L−1 of H2SO4 against only a loss of 0.14–4% for 4-MAcPh between 6 and 9 mol∙L−1 of H2SO4. The potential of 4-MAcPh has also been studied to selectively recover Ta from a model capacitor waste solution. The results showed a selectivity for Ta in the presence of impurities such as Ag, Fe, Ni and Mn. The 4-MAcPh also presents the advantage of having physicochemical properties adapted to its use in liquid-liquid extraction technologies such as mixer-settlers. View Full-Text
Keywords: 4-methylacetophenone; refractory metals; solvent extraction; selective recovery 4-methylacetophenone; refractory metals; solvent extraction; selective recovery
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MDPI and ACS Style

Toure, M.; Arrachart, G.; Duhamet, J.; Pellet-Rostaing, S. Tantalum and Niobium Selective Extraction by Alkyl-Acetophenone. Metals 2018, 8, 654.

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