SEPARATION OF CERIUM FROM OTHER RARE-EARTH METALS
Separation of Ce from other rare-earth metals by oxidation of Ce/sup 3+/ to Ce/sup 4+/ in an aqueous suspension of rare-earth metal hydroxides with oxygen under pressure at an elevated temperature was investigated. The hydroxides were obtained from a solution of chlorides containing 29.5% rareearth metals, either directly by precipitation with caustic soda or ammonia or indirectly by converting the chlorides to double sulfates and by decomposition of the latter with caustic soda. The experimentally determined optimum conditions were: pH = 10; oxygen pressure, 5 to 10 atm; and temperature, 130 deg C. Under these conditions, complete oxidation of Ce occurs in 30 min, but only in the hydroxides obtained by decomposition of sulfates. Oxidation of Ce in hydroxides precipitated from chloride solutions by ammonia is incomplete. Oxygen-treated rare-earth metal hydroxides yield cerium concentrates with up to 95% CeO/sub 2/. (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-027147
- OSTI ID:
- 4818702
- Journal Information:
- Tsvetnye Metally, Journal Name: Tsvetnye Metally Vol. Vol: No. 1
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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CERIUM COMPOUNDS
CERIUM HYDROXIDES
CERIUM SULFATES
CHEMICAL REACTIONS
CHEMISTRY
CHLORIDES
DECOMPOSITION
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PRECIPITATION
PRESSURE
RARE EARTHS
SEPARATION PROCESSES
SODIUM HYDROXIDES
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SULFATES
SUSPENSIONS
TEMPERATURE
TESTING
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