Process for recovering highly pure rare earth oxides from a wast

Details Process for recovering highly pure rare earth oxides from a wast Process for recovering highly pure rare earth oxides from a wast

1985-01-24

1987-03-17

Carter, H. I.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

423263, C01F 1700

Patent

active

046506527

ABSTRACT:
A process for recovering highly pure rare earth oxides from a waste rare earth phosphor containing at least Fe and/or Ca as impurities, which comprises dissolving the waste rare earth phosphor in an excess amount of a strong acid capable of dissolving the waste rare earth phosphor, adding to the solution at a temperature of at least 70.degree. C. oxalic acid in an amount of from 0.3 to 1.8 times the theoretical amount to obtain precipitates of rare earth oxalates, washing the precipitates with warm water having a temperature of at least 50.degree. C. and then baking them.

REFERENCES:
patent: 3506585 (1970-04-01), Otsuka et al.
patent: 4198231 (1980-04-01), Gusset
patent: 4400360 (1983-08-01), Nalewajek
patent: 4405568 (1982-09-01), Nalewajek
patent: 4438078 (1984-03-01), Nalewajek

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