Nonpolluting recovery of rare earth values from rare earth miner

Details Nonpolluting recovery of rare earth values from rare earth miner Nonpolluting recovery of rare earth values from rare earth miner

1990-03-05

1991-04-30

Dean, R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

75743, 4236585, C01F 1700

Patent

active

050116657

ABSTRACT:
Rare earth values are nonpollutingly recovered from a rare earth mineral/ore, especially one containing but minor amounts of the rare earths, by (a) leaching/decomposing such rare earth mineral/ore with a solution of nitric acid to solubilize the rare earth values contained therein, (b) optionally separating insoluble residue from the resulting leach solution, (c) separating the rare earth values from the leach solution, (d) treating the leach solution thus stripped of rare earth values with a hydroxide of a metallic cation M to precipitate solubilized impurities and separating the thus precipitated impurities therefrom, (e) treating the resulting purified solution with sulfuric acid to precipitate metal sulphates and separating the thus precipitated sulfates therefrom to regenerate the above nitric acid solution, and (f) optionally recycling such regenerated solution of nitric acid to the leaching/decomposition step (a).

REFERENCES:
patent: 1084600 (1914-01-01), Best
patent: 2955913 (1960-10-01), Peppard et al.
patent: 4834793 (1989-05-01), Schneider et al.
The Extraction of Thorium and Some Lower Lanthanide Nitrates by Dibutyl Butyl Phosphonate, P. G. Manning, Canadian Journal of Chemistry, vol. 40, pp. 1684-1689.

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