Separation of rare earth values by liquid/liquid extraction

Details Separation of rare earth values by liquid/liquid extraction Separation of rare earth values by liquid/liquid extraction

1991-02-21

1993-03-09

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

423 215, B01D 1104

Patent

active

051924439

ABSTRACT:
The rare earth values contained in an aqueous solution of the nitrates of at least two rare earth elements are conveniently separated by first liquid/liquid extracting such aqueous nitrate solution with a liquid organic phase containing at least two P(O)R.sub.1 R.sub.2 R.sub.3 /P(O)R.sub.4 R.sub.5 R.sub.6 organophosphorus extractants.

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patent: 4617125 (1986-10-01), Danesi
patent: 4647438 (1987-03-01), Sabot et al.
Nikolaev et al, "Extraction of some actinides from nitrate and sulfate solution by methylbis(alkoxymethyl)phosphine oxides", Chemical Abstracts, No. 85123f, vol. 71 (1969), p. 323.
Mikhailichenko et al, "Extraction of rare earth nitrates by neutral organophosphorus extractants" Chemical Abstracts, Abstract No. 129741c, vol. 79 (1973), p. 220.
Mikhailichenko et al, "Extraction of rare earth elements by triisoamylphosphine oxide from nitrate solutions", Chemical Abstracts, Abstract No. 66203p, vol. 83 (1975), p. 505.
Korpusov et al, "Study of the extraction of rare earth elements, americium, and curium from nitrate media using tri-1-methylheptylphosphine oxide", Chemical Abstracts, Abstract No. 15379h, vol. 92 (1980), p. 457.
Mikhailichenko et al, "Extraction of rare earth metals using a mixture of trioctylmethylammonium nitrate and trialkylphosphine oxide", Chemical Abstracts, Abstract No. 95135p, vol. 101 (1984), p. 250.

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