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

T. Kato, G. Granata, C. Tokoro, Y. Tsunazawa, T. Takagi

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルIMPC 2018 - 29th International Mineral Processing Congress
出版社Canadian Institute of Mining, Metallurgy and Petroleum
ページ2681-2689
ページ数9
ISBN(電子版)9787030227119
出版ステータスPublished - 2019
イベント29th International Mineral Processing Congress, IMPC 2018 - Moscow, Russian Federation
継続期間: 2018 9 172018 9 21

出版物シリーズ

名前IMPC 2018 - 29th International Mineral Processing Congress

Other

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

ASJC Scopus subject areas

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

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