Solvent Extraction Research and Development Japan · 2011 · 71 citations · 9 references
EngineeringChemical EngineeringChemistryMembrane ScienceTransport PhenomenaWater TreatmentHeavy Metal RemediationHeavy Metal RemovalIon ExchangeIon-exchange MembranesMembrane FiltrationMembrane MaterialsIon Transport MembranesIonic LiquidsMetal ExtractionMetal Ion ExtractionRare Earth Element ExtractionSelectivitySupported Liquid Membrane ExtractionSupported Liquid Membranes
Selective permeation of rare earth metal ions (Dy and Nd) against ferric ion (Fe) was conducted by an ionic liquid-based supported liquid membrane (SLM).A novel extractant N,N-dioctyldiglycol amic acid (DODGAA) was employed as the mobile carrier because the DODGAA is readily soluble in ionic liquids such as 1-octyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C8mim][Tf2N]) and shows good selectivity to the rare earth metal ions and efficient stripping behavior. Quantitative transport of Dy and Nd was successfully achieved through the SLM impregnated with the [C8mim][Tf2N] containing DODGAA. Ferric ions were transported at the 10 % level, and Dy and Nd were selectively recovered to the receiving phase. The results suggested a potential use of the SLM system proposed in this study for the recovery of the rare earth metals from leaching magnet scrap which produces leach liquor containing a large amount of Fe.
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