A green process for the extraction of lanthanide elements
AssigneesCommissariat A L'energie Atomique Et Aux Energies Alternatives, Centre National De La Recherche Scientifique, Universite De Montpellier, Ecole Nationale Superieure De Chimie De Montpellier
InventorsThomas ZEMB, Asmae EL MAANGAR, Stéphane PELLET-ROSTAING
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Abstract
A method for extracting at least one lanthanide element, preferably selected from lanthanum (La), praseodymium (Pr), neodymium (Nd), europium (Eu), dysprosium (Dy), and ytterbium (Yb), from a solid material including the lanthanide element, one or more waste elements such as iron (Fe), and/or one or more other lanthanide elements. The method implements a composition including water, at least one organic aprotic solvent, and at least one charged hydrotrope. Also, the use of the composition for recycling lanthanide elements, and more particularly WEEE, and for the decontamination of effluents.
Claims17
1-16. (canceled)
A method for extracting at least one first lanthanide element having a molecular weight ML1 (in g/mol) from a solid material comprising said first lanthanide element and one or more other element(s) selected from a second lanthanide element having a molecular weight ML2 (in g/mol), at least one waste element having a molecular weight MWE (in g/mol), and mixture thereof, wherein:
- MWE≤100 g/mol, and
- when the other element is a second lanthanide element, eventually in mixture with a waste element, ML1≥154 g/mol and preferably ML1≥160 g/mol, and ML2<154 g/mol, and
- wherein said method comprises at least the following steps:
- i) preparing a leaching composition comprising an aqueous phase, at least one organic aprotic solvent, and at least one charged hydrotrope,
- ii) mixing the leaching composition with the solid material so as to form a leachate solution comprising the first lanthanide element, and a solid residue comprising said one or more other element(s), and
- iii) separating the leachate solution from the solid residue.
A method for recycling lanthanide elements, and more particularly WEEE, comprising mixing a solid material with a leaching composition comprising an aqueous phase, at least one organic aprotic solvent, and at least one charged hydrotrope.
A method for decontaminating effluents, comprising mixing an effluent with a leaching composition comprising an aqueous phase, at least one organic aprotic solvent, and at least one charged hydrotrope.
Dependencies are inferred from the claim text.