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Hydrogen as a retaining ion for rare-earth separation by ion exchange with EDTA and DCTA
Naphthenic acid solvent extraction of rare-earth sulphates
Extraction of euxenite metal values by fusion with ammonium sulfate or ammonium bisulfate
Recovery of cerium and lanthanum by ozonation of lanthanide solutions
Amino acids as retaining agents for separation of rare-earth elements on ion-exchange resin
Extraction behavior of cerium-group lanthanides in a primary amine-chelating agent system