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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.

Selective Recovery of Dysprosium and Neodymium Ions by a Supported Liquid Membrane Based on Ionic Liquids