Processing of rare earth ores

Details Processing of rare earth ores Processing of rare earth ores

1990-05-03

1990-12-11

Miller, Edward A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

423 11, C01F 100

Patent

active

049769391

ABSTRACT:
Rare earth hydroxides are recovered from the rare earth ores, e.g., monazite, xenotime and/or bastnasite, by treating the ore with an aqueous solution of an alkali metal hydroxide, under agitation and essentially constant pressure, at a temperature of from about 100.degree. to 220.degree. C., and wherein the ratio by weight of alkali metal hydroxide/ore ranges from about 1.4 to 0.5, e.g., a weight ratio of sodium hydroxide/ore of from about 1 to 0.5, or a weight ratio of potassium hydroxide/ore of from about 1.4 to 0.7.

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Bearse et al., "Thorium and Rare Earths from Monazite", Chem. Eng. Prog., vol. 50, No. 5 (1954), pp. 235-239.
Jamrack, "Rare Metal Extraction", Chemical Engineering Techniques, MacMillan Co., N.Y. (1963), pp. 32-35.
Krumholz, "Brazilian Practice for Monazite Treatment", Symposium on Rare Metals (Dec. 1-3, 1957), Organized by United Nations Educational Scientific & Cultural Organisation, Atomic Energy Establishment, and the Indian Institute of Metals, pp. 78-82.
Sethna, et al., "Treatment of Monazite Sands with Special Reference to Indian Practice", Symposium on Rare Metals (Dec. 1-3, 1957), Organized by United Nations Educational Scientific & Cultural Organisation, Atomic Energy Establishment, and the Indian Institute of Metals, pp. 68-77.
Cronan, "Which Process to Free Rare Earths", Chem. Eng., vol. 66 (Jul. 27, 1959), pp. 62, 64, and 104.

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