Japan Geoscience Union Meeting 2024

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[J] Oral

H (Human Geosciences ) » H-RE Resource and Engineering Geology

[H-RE13] Earth Resource Science

Mon. May 27, 2024 1:45 PM - 3:00 PM Convention Hall (CH-A) (International Conference Hall, Makuhari Messe)

convener:Tsubasa Otake(Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University), Mihoko Hoshino(National Institute of Advanced Industrial Science and Technology), Ryohei Takahashi(Graduate School of International Resource Sciences, Akita University), Tatsuo Nozaki(Submarine Resources Research Center, Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology), Chairperson:Ryohei Takahashi(Graduate School of International Resource Sciences, Akita University), Mihoko Hoshino(National Institute of Advanced Industrial Science and Technology)


1:45 PM - 2:15 PM

[HRE13-01] Selective recovery of rare earth elements from unconventional sources

★Invited Papers

*Takeshi Ogata1 (1.National Institute of Advanced Industrial Science and Technology)

Keywords:rare earth elements, recovery, unconventional sources, adsorption

Diversification of sources is necessary to ensure a stable supply of rare earth elements (REEs), and we are focusing on unconventional sources containing REEs. In these sources, REEs are present at low concentrations and base metals such as iron and aluminum are present at high concentrations. Adsorption is an effective hydrometallurgical technology for recovering target metal ions when their concentrations are low. Commercially available adsorbents such as ion exchange and chelating resins adsorb REEs but also iron and other elements, making them unsuitable for the separation and recovery of dilute REEs from unconventional sources. We have developed a novel adsorbent consisting of diglycolamic acid ligands immobilized on the surface of silica gel particles (Figure). This adsorbent selectively adsorbs REEs from low pH solutions containing high concentrations of base metals and is particularly effective in recovering heavy REEs. In addition, its high adsorption rate and easy desorption make it a promising candidate for practical applications.