Sorption of rare-earth elements onto a ligand-associated media for pH-dependent extraction and recovery of critical materials [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 553.495 Platinum metals
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Office of the Assistant Secretary of Energy for Fossil Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2020
• Mô tả vật lý: Size: Article No. 118061 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 267689
• Chủ đề: 1. 01 coal, lignite, and peat; 2. 36 materials science; 3. 42 engineering; 4. 99 general and miscellaneous; 5. Dtpa

Tóm tắt

 Toward recovering rare-earth elements, we prepared a solid-phase media that binds and elutes metals for extraction and enrichment. We report the synthesis and methodology for a solid-phase media that exhibits pH-dependent binding of aqueous rare-earth elements. The media shows pH-dependent binding of Nd<
 sup>
 III<
 /sup>
  and retains efficiency over at least six cycles of binding and elution. Mixed solutions of rare-earth elements demonstrated a preference for mid and heavy rare-earth elements based on thermodynamic binding preferences of the ligand, and selectivity for rare-earth elements over iron and aluminum were observed with coal fly ash leachate. In conclusion, we expect this new recovery method to be a significant step towards aqueous-based extraction and enrichment of critically important rare-earth elements.