Liquid/liquid extraction of rare earth/cobalt values

Details Liquid/liquid extraction of rare earth/cobalt values Liquid/liquid extraction of rare earth/cobalt values

1989-02-21

1990-10-23

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

423 215, B01D 1104

Patent

active

049649965

ABSTRACT:
Rare earth and cobalt values are separated and recovered from residue materials containing them, e.g., the waste residues from the production of samarium/cobalt magnets, by (a) dissolving such residues with nitric acid, (b) liquid/liquid extracting the resulting aqueous nitric phase with an organic phase including at least one water-insoluble organic extractant having at least one primary, secondary, tertiary or quaternary amine function, whereby the rare earth values are transferred into the organic phase, and (c) recovering the rare earth values from the organic phase.

REFERENCES:
patent: 4765834 (1988-08-01), Ananthapadmanabhan et al.

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