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    Treatment of monazite by organic acids I: Solution conversion of rare earths

    Access Status
    Fulltext not available
    Authors
    Lazo, D.
    Dyer, Laurence
    Alorro, Richard
    Browner, Richard
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Lazo, D. and Dyer, L. and Alorro, R. and Browner, R. 2017. Treatment of monazite by organic acids I: Solution conversion of rare earths. Hydrometallurgy. 174: pp. 202-209.
    Source Title
    Hydrometallurgy
    DOI
    10.1016/j.hydromet.2017.10.003
    ISSN
    0304-386X
    School
    Dept of Mining Eng & Metallurgical Eng
    URI
    http://hdl.handle.net/20.500.11937/62957
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier B.V. In the present study, the potential for using organic acids to enhance the dissolution of monazite (nominally CePO 4 ) was examined. Oxalic acid was found to release a significant amount of phosphorus ( > 30%) at pH ≤ 1.3 and room temperature over periods of up to 72 h. However, only very small proportions of rare earths were present in solution. The lower than expected iron level present in solution (and thus dissolution of iron oxides) displays the selectivity of the process given the established ability of oxalic acid to complex iron. Analysis of the solids determined that the rare earths were re-precipitating as oxalate salts. This is significant as rare earth oxalates have been shown to be amenable to dissolution. Leach tests conducted over 168 h displayed slowing of the reaction to the point where little further leaching was occurring. This was confirmed to be due to oxalate consumption and not passivation via the re-precipitation of the oxalate species. While a slight increase in temperature (25 to 45 °C) had little impact, elevation to ≥ 65 °C greatly accelerated the reaction achieving similar results in only 10 h. However, iron dissolution also increased markedly. Further temperature elevation to 85 °C significantly increased the dissolution of iron to the detriment of phosphorus release. This is a significant consideration in terms of both extraction efficiency and reagent consumption. This process presents the opportunity to remove the greatest hazards, both safety and environmental, and decrease the energy and potentially reagent requirements for monazite treatment. The second paper of this series discusses the subsequent stage of processing the treated monazite for rare earth extraction.

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    • Treatment of monazite by organic acids II: Rare earth dissolution and recovery
      Lazo, D.; Dyer, Laurence; Alorro, Richard; Browner, Richard (2018)
      © 2018 Elsevier B.V. In the present study, the second stage of a sequential extraction method of rare earths from monazite is discussed. The high cost and environmental impact of the conventional extraction processes of ...
    • Silicate, phosphate and carbonate mineral dissolution behaviour in the presence of organic acids: A review
      Lazo, D.; Dyer, L.; Alorro, Richard (2017)
      Researchers in the field of geoscience have identified several effects on the stability of the surrounding minerals caused by naturally occurring solution species. Organic acids and their conjugate salts have been shown ...
    • Selective Complexation Leaching of Rare Earth Minerals: A New Hydrometallurgical Route Inspired by Geochemical Process
      Lazo, Daniel Eduardo (2019)
      This present study was intended to determine the potential of organic acids in REEs, specifically in monazite concentrate. The proposed process in this study consisted of a pre-treatment, leaching and RE hydroxide ...
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