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- Effect of temperature in ion-exchange separation of rare-earth elements and recovery of EDTA from effluent solutions
- Hydrogen as a retaining ion for rare-earth separation by ion exchange with EDTA and DCTA
- Naphthenic acid solvent extraction of rare-earth sulphates
- Amino acids as retaining agents for separation of rare-earth elements on ion-exchange resin
- Differential extraction of rare-earth elements in quaternary ammonium compound-chelating agent systems
- Reduction of tetravalent cerium and its application to stripping from tri-©œn-butyl phosphate