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U.S. Department of Energy
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NAPHTHENIC ACID SOLVENT EXTRACTION OF RARE-EARTH SULFATES

Technical Report ·
OSTI ID:4054805
Studies were conducted to assess the potential of naphthenic acid as a fractional extractant for rare-earth mixtures and yttrium in sulfate solution. Naphthenic acid was an effective extractant, and separntion factors were favorable in the presence of aqueous phase chelating agerts. Addition of EDTA to the naphthenic acid extraction system resulted in average separation factors of 2.2 between adjacent yttrium-group elements, whereas DTPA resulted in average separation factors of 3.5 between adjacent ceriumgroup elements. EDTA was of value in separating yttrium from the rare-earth elements. Thorium and uranium were preferentially extracted over the trivalent rare -earth elements by naphthenic acid. (auth)
Research Organization:
Bureau of Mines. Reno Metallurgy Research Center, Nev.
NSA Number:
NSA-18-017925
OSTI ID:
4054805
Report Number(s):
BM-RI-6396
Country of Publication:
Country unknown/Code not available
Language:
English