Use of extraction chromatography in the recycling of critical metals from thin film leach solutions
authors Schaeffer, N; Grimes, SM; Cheeseman, CR
nationality International
journal INORGANICA CHIMICA ACTA
author keywords Extraction chromatography; DODGAA-[C4mimi][Tf2N]-SIR; Critical metals; Thin film leach solutions
keywords RARE-EARTH-ELEMENTS; SOLVENT-EXTRACTION; IONIC LIQUIDS; SEPARATION; RECOVERY; ACID; INDIUM; RESIN; LANTHANIDES; ACTINIDES
abstract Phosphors and optoelectronic thin film electronic device layers contain critical metals including lanthanides and indium that should be recycled. Solvent impregnated resins (SIRs) containing (i) DEHPA (ii) DODGAA and (iii) DODGAA with the ionic liquid [C(4)mim][Tf2N] are investigated in extraction chromatography methodologies to recover and separate critical metals from dilute solutions that model those leached from thin films. Optimum adsorption of metals occurs at pH 1.5-3.5 but is highest on DODGAA-[C(4)rnim][Tf2N]. The recovery and separation of adsorbed metal species on the DODGAA-[C(4)mim][Tf2N] SIR resin from solutions containing the glass matrix ions, Ca(I1) and Al(III), along with In(111) and Sn(IV) or lanthanide ions is achieved by elution with HNO3. Ca(II) and Al(III) are completely eluted with 0.1 M HNO3 retaining the target critical metal species on the resin. Separation of In from Sn is achieved by elution of In(III) with 2.5 M HNO3 and Sn(IV) with 5 M acid. La is separated from the other lanthanides by elution of La(III) with 2.5 M HNO3 and the remaining lanthanides with 5 M acid. The SIR resins can be reused over a series of at least five cycles of loading, stripping, and rinsing to reduce reagent costs and achieve economic critical metal recovery by extraction chromatography. (C) 2016 Published by Elsevier B.V.
publisher ELSEVIER SCIENCE SA
issn 0020-1693
year published 2017
volume 457
beginning page 53
ending page 58
digital object identifier (doi) 10.1016/j.ica.2016.11.020
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000392777700008
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