Separation of thorium and rare earth values from fluoride concen

Details Separation of thorium and rare earth values from fluoride concen Separation of thorium and rare earth values from fluoride concen

1988-11-28

1990-09-04

Miller, Edward A.

Compositions

Radioactive compositions

423 3, 423 11, 423 211, 423 215, 423 8, 423252, C01F 1500, C01F 1700

Patent

active

049542931

ABSTRACT:
Thorium and rare earth values are separated from a fluoride concentrate thereof, by decomposing such concentrate with aqueous sodium hydroxide under conditions such that the amount of sodium hydroxide is at least 1.4 times the stoichiometric amount and the initial sodium hydroxide/water ratio in the medium of decomposition ranges from 1 to 40% by weight, whereby a precipitate of thorium hydroxide and rare earth hydroxides is produced, together with a solution of sodium fluoride, and then separating the NaF solution therefrom.

REFERENCES:
patent: 1307153 (1919-06-01), Ryan
patent: 1335157 (1920-03-01), Dietsche
patent: 2915363 (1959-12-01), Lakeland
patent: 2995419 (1961-08-01), Koshland et al.
patent: 3146063 (1964-08-01), Moore et al.
patent: 3619128 (1971-11-01), Angstadt
patent: 4461748 (1984-07-01), Sabot et al.
patent: 4744960 (1988-05-01), Floreancig et al.
E. L. Chuvilina, et al., "Reaction of Rare Earth Element Fluorides with Solutions of Sodium Carbonate and Hydroxide", Chemical Abstracts, vol. 103, No. 152663b (1985), p. 736.

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