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Open AccessFeature PaperArticle

Tantalum and Niobium Selective Extraction by Alkyl-Acetophenone

DMRC, CEA Marcoule, 30207 Bagnols sur Cèze CEDEX, France
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;
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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