The improvement of heavy rare earth recovery from weathered residual rare earth ore by planetary milling added sodium hydroxide

Tatsuya Kato, Giuseppe Granata, Chiharu Tokoro, Y. Tsunazawa, T. Takagi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The rare earth elements (REE) are composed of 17 elements that are 15 elements of lanthanide added scandium and yttrium. REE are divided into light rare earth elements (LREE) and heavy rare earth elements (HREE). Although the supply source of LREE is distributed around the world, the supply sources are unevenly distributed. Thus, the development of a new HREE supply source is required. In this study, we focused on the weathered residual rare earth ore as a new HREE supply source. Since so far this weathered residual rare earth ore could not be treated neither by flotation nor by wet high intensity magnetic separation, it was not considered as HREE resource before. In this study, we investigated the leaching of HREE from the weathered residual rare earth ore and elucidated the effectiveness of planetary milling with sodium hydroxide as a method to enhance their recovery. For this purpose, the weathered residual rare earth ore was first grinded by planetary mill in the presence of sodium hydroxide and then leached by sulfuric acid. The influence of planetary milling on HREE recovery was investigated by assisting the leaching experiments with X-ray absorption fine structure (XAFS) in cerium and yttrium K-edge. Since yttrium was the most contained HREE in the weathered residual rare earth ore used in this study, we focused on yttrium in XAFS analysis. Results clearly showed that the recovery of HREE increased by planetary milling with sodium hydroxide. XAFS analysis revealed that a part of the yttrium in the weathered residual rare earth ore was changed to yttrium hydroxide by planetary milling with sodium hydroxide. It is supposed that all HREE were affected like yttrium due to a similar behavior observed in leaching.

    Original languageEnglish
    Title of host publicationIMPC 2018 - 29th International Mineral Processing Congress
    PublisherCanadian Institute of Mining, Metallurgy and Petroleum
    Pages2681-2689
    Number of pages9
    ISBN (Electronic)9787030227119
    Publication statusPublished - 2019 Jan 1
    Event29th International Mineral Processing Congress, IMPC 2018 - Moscow, Russian Federation
    Duration: 2018 Sep 172018 Sep 21

    Other

    Other29th International Mineral Processing Congress, IMPC 2018
    CountryRussian Federation
    CityMoscow
    Period18/9/1718/9/21

    Fingerprint

    Sodium Hydroxide
    Rare earth elements
    Rare earths
    Ores
    hydroxide
    rare earth element
    Sodium
    sodium
    Yttrium
    Recovery
    yttrium
    X ray absorption
    Leaching
    leaching
    ore
    Scandium
    Cerium
    Lanthanoid Series Elements
    scandium
    Magnetic separation

    Keywords

    • Heavy rare earth elements
    • Leaching
    • Planetary milling
    • Weathered residual rare earth ore
    • X-ray absorption fine structure analysis

    ASJC Scopus subject areas

    • Mechanical Engineering
    • Earth-Surface Processes
    • Geochemistry and Petrology
    • Geotechnical Engineering and Engineering Geology

    Cite this

    Kato, T., Granata, G., Tokoro, C., Tsunazawa, Y., & Takagi, T. (2019). The improvement of heavy rare earth recovery from weathered residual rare earth ore by planetary milling added sodium hydroxide. In IMPC 2018 - 29th International Mineral Processing Congress (pp. 2681-2689). Canadian Institute of Mining, Metallurgy and Petroleum.

    The improvement of heavy rare earth recovery from weathered residual rare earth ore by planetary milling added sodium hydroxide. / Kato, Tatsuya; Granata, Giuseppe; Tokoro, Chiharu; Tsunazawa, Y.; Takagi, T.

    IMPC 2018 - 29th International Mineral Processing Congress. Canadian Institute of Mining, Metallurgy and Petroleum, 2019. p. 2681-2689.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Kato, T, Granata, G, Tokoro, C, Tsunazawa, Y & Takagi, T 2019, The improvement of heavy rare earth recovery from weathered residual rare earth ore by planetary milling added sodium hydroxide. in IMPC 2018 - 29th International Mineral Processing Congress. Canadian Institute of Mining, Metallurgy and Petroleum, pp. 2681-2689, 29th International Mineral Processing Congress, IMPC 2018, Moscow, Russian Federation, 18/9/17.
    Kato T, Granata G, Tokoro C, Tsunazawa Y, Takagi T. The improvement of heavy rare earth recovery from weathered residual rare earth ore by planetary milling added sodium hydroxide. In IMPC 2018 - 29th International Mineral Processing Congress. Canadian Institute of Mining, Metallurgy and Petroleum. 2019. p. 2681-2689
    Kato, Tatsuya ; Granata, Giuseppe ; Tokoro, Chiharu ; Tsunazawa, Y. ; Takagi, T. / The improvement of heavy rare earth recovery from weathered residual rare earth ore by planetary milling added sodium hydroxide. IMPC 2018 - 29th International Mineral Processing Congress. Canadian Institute of Mining, Metallurgy and Petroleum, 2019. pp. 2681-2689
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    AB - The rare earth elements (REE) are composed of 17 elements that are 15 elements of lanthanide added scandium and yttrium. REE are divided into light rare earth elements (LREE) and heavy rare earth elements (HREE). Although the supply source of LREE is distributed around the world, the supply sources are unevenly distributed. Thus, the development of a new HREE supply source is required. In this study, we focused on the weathered residual rare earth ore as a new HREE supply source. Since so far this weathered residual rare earth ore could not be treated neither by flotation nor by wet high intensity magnetic separation, it was not considered as HREE resource before. In this study, we investigated the leaching of HREE from the weathered residual rare earth ore and elucidated the effectiveness of planetary milling with sodium hydroxide as a method to enhance their recovery. For this purpose, the weathered residual rare earth ore was first grinded by planetary mill in the presence of sodium hydroxide and then leached by sulfuric acid. The influence of planetary milling on HREE recovery was investigated by assisting the leaching experiments with X-ray absorption fine structure (XAFS) in cerium and yttrium K-edge. Since yttrium was the most contained HREE in the weathered residual rare earth ore used in this study, we focused on yttrium in XAFS analysis. Results clearly showed that the recovery of HREE increased by planetary milling with sodium hydroxide. XAFS analysis revealed that a part of the yttrium in the weathered residual rare earth ore was changed to yttrium hydroxide by planetary milling with sodium hydroxide. It is supposed that all HREE were affected like yttrium due to a similar behavior observed in leaching.

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