Recovery of rare earth elements

Details Recovery of rare earth elements Recovery of rare earth elements

2011-08-09

2011-08-09

Bos, Steven (Department: 1736)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

C423S020000, C423S021500, C423S150100, C423S263000

Reexamination Certificate

active

07993612

ABSTRACT:
A process for recovering rare earth elements from a composite ore containing rare earth elements that includes a monazite group mineral and an apatite mineral, includes pre-leaching the composite ore with an acid so as to substantially dissolve the apatite mineral into the leach liquor and precipitating rare earth elements from the pre-leach liquor. The residue of the pre-leaching step is subjected to an acid bake treatment, followed by a water leach, to produce a water leach liquor rich in rare earth elements. Impurities including thorium and iron are separated from the water leach liquor by introducing a neutralizing additive to the water leach liquor rich in rare earth elements, and rare earth elements are precipitated from the post-neutralization liquor.

REFERENCES:
patent: 5011665 (1991-04-01), Cailly et al.
patent: 5531970 (1996-07-01), Carlson
patent: 2009/0078087 (2009-03-01), Heidenfelder et al.
patent: 2104941 (1998-02-01), None

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