Integrated Leaching and Separation of Metals Using Mixtures of Organic Acids and Ionic Liquids.
Molecules
; 25(23)2020 Nov 27.
Article
em En
| MEDLINE
| ID: mdl-33260955
ABSTRACT
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.
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MEDLINE
Assunto principal:
Compostos Orgânicos
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Ácidos
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Poluentes Químicos da Água
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Líquidos Iônicos
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Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article