Preprint Article Version 1 This version is not peer-reviewed

Tantalum and Niobium Selective Extraction by Alkyl-Acetophenone

Version 1 : Received: 30 July 2018 / Approved: 30 July 2018 / Online: 30 July 2018 (22:03:33 CEST)

A peer-reviewed article of this Preprint also exists.

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

Journal reference: Metals 2018, 8, 654
DOI: 10.3390/met8090654

Abstract

A study has been carried out on Ta and Nb recovery by liquid-liquid extraction process using 4-methylacetophenone (4-MAcPh) as organic phase. The 4-MAcPh was compared to methylisobutylketone (MIBK) with respect to extraction efficiencies (kD 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 to 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 Fe, Ni, 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.

Subject Areas

4-Methylacetophenone; Refractory metals; Solvent extraction; Selective recovery