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Issue 22, 2018, Issue in Progress
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Efficient separation of rare earths recovered by a supported ionic liquid from bauxite residue leachate

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Abstract

Bauxite residue (BR) contains substantial concentrations of rare-earth elements (REEs), but their recovery is a challenge. Acidic BR leachates typically comprise much higher concentrations of base elements (g L−1) than those of the REEs (ppm). Thus, adsorbents that are highly selective for the REEs over the base elements are required for the separation. The novel supported ionic liquid phase (SILP) betainium sulfonyl(trifluoromethanesulfonylimide) poly(styrene-co-divinylbenzene) [Hbet-STFSI-PS-DVB] was evaluated for the uptake of REEs (Sc, Y, Nd, Dy) in the presence of base elements (Ca, Al, Fe) from BR leachates. Breakthrough curves from acidic nitrate and sulfate media were investigated, as both HNO3 and H2SO4 are commonly used for leaching of BR. The SILP exhibited a superior affinity for REEs in both media, except in the case of Sc(III) from the sulfate feed. The recovery rates of the trace amounts of REEs from the real nitrate feed were remarkably high (71.7–100%) via a simple chromatography separation, without requiring complexing agents or a pretreatment for the removal of interfering elements. The REEs were purified from the base elements and separated into three sub-groups (scandium, light REEs and heavy REEs) by an optimized elution profile with H3PO4 and HNO3 in a single chromatographic separation step.

Graphical abstract: Efficient separation of rare earths recovered by a supported ionic liquid from bauxite residue leachate

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Publication details

The article was received on 17 Dec 2017, accepted on 21 Mar 2018 and first published on 26 Mar 2018


Article type: Paper
DOI: 10.1039/C7RA13402A
Citation: RSC Adv., 2018,8, 11886-11893
  • Open access: Creative Commons BY-NC license
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    Efficient separation of rare earths recovered by a supported ionic liquid from bauxite residue leachate

    D. Avdibegović, M. Regadío and K. Binnemans, RSC Adv., 2018, 8, 11886
    DOI: 10.1039/C7RA13402A

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