Production of rare earth hydroxides from phosphate ores

Details Production of rare earth hydroxides from phosphate ores Production of rare earth hydroxides from phosphate ores

1986-11-10

1988-07-19

Garvin, Patrick P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

423263, C01F 1700

Patent

active

047584122

ABSTRACT:
The rare earth hydroxides are improvedly prepared by (i) treating a rare earth phosphate mineral, e.g., monazite or xenotime, with an aqueous solution of an alkali metal hydroxide, (ii) separating therefrom rare earth hydroxide solids and a liquid phase essentially consisting of alkali metal phosphate and alkali metal hydroxide, (iii) crystallizing alkali metal phosphate from said liquid phase, (iv) separating the mother liquor of crystallization therefrom which contains said alkali metal hydroxide, (v) adding calcium oxide or hydroxide to the mother liquor thus separated to form a precipitate therein, (vi) separating said formed precipitate, and (vii) recycling the mother liquor of separation to said treatment step (i).

REFERENCES:
patent: 2783125 (1957-02-01), di Rohden et al.
patent: 2811411 (1957-10-01), Calkins
patent: 2815264 (1957-12-01), Calkins et al.
patent: 2995420 (1961-08-01), Duncan et al.
patent: 3049403 (1962-08-01), Krumholz et al.
patent: 3763050 (1973-10-01), Dikhoff et al.
Meerson, "More Rapid Method for Extraction of Thorium and Rare Earths from Monazite by Alkali Treatment", UDC 669.2/8.094, pp. 20-22.
Chemical Abstracts, vol. 92, No. 18, May 1980, p. 153, Resume No. 14934lu.

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