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Article

Integrated Leaching and Separation of Metals Using Mixtures of Organic Acids and Ionic Liquids

CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
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Academic Editors: Magdalena Regel-Rosocka and Isabelle Billard
Molecules 2020, 25(23), 5570; https://doi.org/10.3390/molecules25235570
Received: 4 November 2020 / Revised: 25 November 2020 / Accepted: 25 November 2020 / Published: 27 November 2020
In this work, the aqueous phase diagram for the mixture of the hydrophilic tributyltetradecyl phosphonium ([P44414]Cl) ionic liquid with acetic acid (CH3COOH) is determined, and the temperature dependency of the biphasic region established. Molecular dynamic simulations of the [P44414]Cl + CH3COOH + H2O system indicate that the occurrence of a closed “type 0” biphasic regime is due to a “washing-out” phenomenon upon addition of water, resulting in solvophobic segregation of the [P44414]Cl. The solubility of various metal oxides in the anhydrous [P44414]Cl + CH3COOH system was determined, with the system presenting a good selectivity for CoO. Integration of the separation step was demonstrated through the addition of water, yielding a biphasic regime. Finally, the [P44414]Cl + CH3COOH system was applied to the treatment of real waste, NiMH battery black mass, being shown that it allows an efficient separation of Co(II) from Ni(II), Fe(III) and the lanthanides in a single leaching and separation step. View Full-Text
Keywords: critical metals; process intensification; metal leaching; solvent extraction; solvometallurgy critical metals; process intensification; metal leaching; solvent extraction; solvometallurgy
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MDPI and ACS Style

Vargas, S.J.R.; Passos, H.; Schaeffer, N.; Coutinho, J.A.P. Integrated Leaching and Separation of Metals Using Mixtures of Organic Acids and Ionic Liquids. Molecules 2020, 25, 5570. https://doi.org/10.3390/molecules25235570

AMA Style

Vargas SJR, Passos H, Schaeffer N, Coutinho JAP. Integrated Leaching and Separation of Metals Using Mixtures of Organic Acids and Ionic Liquids. Molecules. 2020; 25(23):5570. https://doi.org/10.3390/molecules25235570

Chicago/Turabian Style

Vargas, Silvia J.R., Helena Passos, Nicolas Schaeffer, and João A.P. Coutinho 2020. "Integrated Leaching and Separation of Metals Using Mixtures of Organic Acids and Ionic Liquids" Molecules 25, no. 23: 5570. https://doi.org/10.3390/molecules25235570

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