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Differential Extraction of Rare-earth Elements in Quaternary Ammonium Compound-chelating Agent Systems.
NTIS: PB 200 705 :16 pages
Solvent extraction separation of light group rare-earth elements in a quaternary ammonium compound-chelating agent system was demonstrated in single-stage studies. Typical separation factor values obtained were 93 for lanthanum-praseodymium, 5.4 For praseodymium-neodymium, and 11.6 For neodymium-samarium. These values are significantly higher than those obtained using organophosphate extractants. Further studies in a 20-stage countercurrent mixer-settler resulted in the production of 99 percent lanthanum (oxide basis) of 96-percent recovery. Subsequently, 88 percent of the neodymium with a purity of 92 percent was recovered in the raffinate.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 200 705
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division