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    Microfluidic solvent extraction of rare earth elements from a mixed oxide concentrate leach solution using Cyanex® 572

    Access Status
    Fulltext not available
    Authors
    Kolar, E.
    Catthoor, R.
    Kriel, F.
    Sedev, Rossen
    Middlemas, S.
    Klier, E.
    Hatch, G.
    Priest, C.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Kolar, E. and Catthoor, R. and Kriel, F. and Sedev, R. and Middlemas, S. and Klier, E. and Hatch, G. et al. 2016. Microfluidic solvent extraction of rare earth elements from a mixed oxide concentrate leach solution using Cyanex® 572. Chemical Engineering Science. 148: pp. 212-218.
    Source Title
    Chemical Engineering Science
    DOI
    10.1016/j.ces.2016.04.009
    ISSN
    0009-2509
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/54033
    Collection
    • Curtin Research Publications
    Abstract

    Solvent extraction of rare earth elements (REEs) involves hundreds of individual extraction and phase separation cycles, fine adjustment of solution conditions, and individual stage and overall process times that are long. Therefore, we investigated microfluidic solvent extraction (microSX) of REEs from a leached mixed rare earth oxide (REO) mineral concentrate using a phosphorus-based cationic exchange extractant (Cyanex® 572). A Y-Y microchip was used, in which the aqueous and organic phases were contacted for up to 15 s with sub-second resolution. The extraction rate and selectivity for heavy REEs was determined for the prepared leach solution. Good selectivity for heavy REEs was observed using the microchip for leach solutions adjusted to pH 0.7. Extraction rates on the microchip were typically double that observed in conventional (bulk) solvent extractions, except for Lu and Yb, which were three-times faster. The faster extraction can be largely attributed to the higher surface-to-volume ratio achieved in our microfluidic experiments; double that observed for bulk extractions under the conditions employed.

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