Tantalum and Niobium Selective Extraction by Alkyl-Acetophenone

Moussa Toure (1, 2) , Guilhem Arrachart (2) , Jean Duhamet (1) , S Pellet-Rostaing (2)

1 DMRC - Département de recherche sur les procédés pour la mine et le recyclage du combustible
2 LTSM - Tri ionique par les Systèmes Moléculaires auto-assemblés

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 H 2 SO 4 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 H 2 SO 4 against only a loss of 0.14-4% for 4-MAcPh between 6 and 9 mol·L −1 of H 2 SO 4. 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.

Mots clés: 4-methylacetophenone; refractory metals; solvent extraction; selective recovery

Domaines: Génie chimique

Moussa Toure, Guilhem Arrachart, Jean Duhamet, S Pellet-Rostaing. Tantalum and Niobium Selective Extraction by Alkyl-Acetophenone. Metals, 2018, 8 (9), pp.654. ⟨10.3390/met8090654⟩. ⟨hal-02062505⟩