Chemical leaching of rare earth elements from highly REY-rich mud

Yutaro Takaya, Koichiro Fujinaga, Naoya Yamagata, Syuhei Araki, Ryota Maki, Kentaro Nakamura, Koichi Iijima, Yasuhiro Kato

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Seafloor sediment rich in rare earth elements and Y (REY-rich mud) has received attention as a new resource for REY. During research cruise KR13-02 of R/V Kairei, mud containing more than 5,000 ppm total REY was collected near Minamitorishima Island, northwestern Pacific Ocean. We conducted a series of chemical leaching experiments on this material, varying the acid concentrations, leaching times, and temperature to determine the optimum conditions of REY leaching from REY-rich mud. The highest extraction efficiency of REY other than Ce was 95.1% using hydrochloric acid and 81.3% using sulfuric acid. Extraction efficiency of REY was highest under conditions of relatively low acid concentrations (0.25-0.5 mol/L), short leaching times (2-5 min), and room temperature (25°C). REY extraction amount decreased with increasing acid concentration, leaching time (only in the case of sulfuric acid), and temperature, apparently because of precipitation of calcium sulfate, rare earth phosphate, and rare earth-Na double sulfate. Although further research is needed, the leaching properties we determined are generally favorable for industrial exploitation of REY-rich mud.

    Original languageEnglish
    Pages (from-to)637-652
    Number of pages16
    JournalGeochemical Journal
    Volume49
    Issue number6
    DOIs
    Publication statusPublished - 2015

    Fingerprint

    mud
    leaching
    Rare earth elements
    Leaching
    rare earth element
    rare earth elements
    sulfuric acid
    Rare earths
    acids
    Acids
    sulfates
    acid
    sulfate
    Calcium Sulfate
    Hydrochloric Acid
    Pacific Ocean
    temperature
    hydrochloric acid
    exploitation
    Temperature

    Keywords

    • Chemical leaching
    • Deep-sea mineral resource
    • Rare earth elements
    • REY-rich mud

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geophysics

    Cite this

    Takaya, Y., Fujinaga, K., Yamagata, N., Araki, S., Maki, R., Nakamura, K., ... Kato, Y. (2015). Chemical leaching of rare earth elements from highly REY-rich mud. Geochemical Journal, 49(6), 637-652. https://doi.org/10.2343/geochemj.2.0373

    Chemical leaching of rare earth elements from highly REY-rich mud. / Takaya, Yutaro; Fujinaga, Koichiro; Yamagata, Naoya; Araki, Syuhei; Maki, Ryota; Nakamura, Kentaro; Iijima, Koichi; Kato, Yasuhiro.

    In: Geochemical Journal, Vol. 49, No. 6, 2015, p. 637-652.

    Research output: Contribution to journalArticle

    Takaya, Y, Fujinaga, K, Yamagata, N, Araki, S, Maki, R, Nakamura, K, Iijima, K & Kato, Y 2015, 'Chemical leaching of rare earth elements from highly REY-rich mud', Geochemical Journal, vol. 49, no. 6, pp. 637-652. https://doi.org/10.2343/geochemj.2.0373
    Takaya, Yutaro ; Fujinaga, Koichiro ; Yamagata, Naoya ; Araki, Syuhei ; Maki, Ryota ; Nakamura, Kentaro ; Iijima, Koichi ; Kato, Yasuhiro. / Chemical leaching of rare earth elements from highly REY-rich mud. In: Geochemical Journal. 2015 ; Vol. 49, No. 6. pp. 637-652.
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