Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Rare earth metal
Patent
1976-05-19
1977-08-09
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Rare earth metal
75101BE, C01F 1700
Patent
active
040411257
ABSTRACT:
An improved liquid-liquid extraction process for the separation of the elements of the lanthanide series is disclosed. The process involves dissolving the lanthanides in a sulfuric acid solution to form rare earth sulfates whereafter the solution is contacted with an organic solvent immiscible with water and containing di (2-ethylhexyl) phosphoric acid whereby the lanthanides are separated from impurities and at least some of the lanthanides are extracted into the organic phase. Thereafter, the organic and aqueous phases are separated and the organic phase containing the impurities-separated lanthanides is subjected to a back extraction with an aqueous phase comprising an aqueous solution with sulfuric acid. The contact time between the aqueous and organic phases in the back extraction is regulated so that a desired or desired elements of the lanthanides are back extracted into the aqueous phase. The contact time is controlled and is less than the total extraction equilibrium time between the phases. The organic and aqueous solution concentrations are also controlled. After a predetermined contact time, the aqueous and organic phases are immediately separated.
REFERENCES:
patent: 2955913 (1960-10-01), Peppard et al.
patent: 3110556 (1963-11-01), Peppard et al.
patent: 3812232 (1974-05-01), Bauer et al.
Alstad Jorolf
Farbu Leif
Carter Herbert T.
Forskningsgruppe for Sjeldne Jordarter
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