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    Microfluidic solvent extraction of rare earth elements

    Access Status
    Fulltext not available
    Authors
    Kriel, F.
    Kolar, E.
    Sedev, Rossen
    Catthoor, R.
    Middlemas, S.
    Klier, E.
    Hatch, G.
    Priest, C.
    Date
    2016
    Type
    Conference Paper
    
    Metadata
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    Citation
    Kriel, F. and Kolar, E. and Sedev, R. and Catthoor, R. and Middlemas, S. and Klier, E. and Hatch, G. et al. 2016. Microfluidic solvent extraction of rare earth elements.
    Source Title
    IMPC 2016 - 28th International Mineral Processing Congress
    ISBN
    9781926872292
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/68741
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 TAPPI Press. All rights reserved. This paper reports solvent extraction of rare earth elements (REEs) carried out using a microfluidic device and considers the REE loading limit of the organic phase under laminar flow. The microfluidic device contacts aqueous and organic phase streams for a precisely defined contact time (sub-second resolution) and then separates them for offline analysis. Experiments are reported examining the effect of contact time on extraction. We focus on three REEs: one ‘light’ (Nd), one ‘mid’ (Dy), and one ‘heavy’ (Yb) REE, which are extracted using Cyanex®572. It appears that loading limits may be locally exceeded in the organic phase near to the liquid-liquid interface, where third phase deposits are observed. Third phase formation was also observed close to the liquid-liquid interface in two-dimensional confinement, showing similar third phase adsorption on glass plates. It is also shown that, under microfluidic flow, a typical first ‘split’ between heavy REEs and light REEs can be carried out without exceeding loading limits.

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