Extraction of rare earth elements using alkyl phosphinic acid or

Details Extraction of rare earth elements using alkyl phosphinic acid or Extraction of rare earth elements using alkyl phosphinic acid or

1995-12-13

1997-04-22

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

C01F 1700

Patent

active

056226799

ABSTRACT:
A method whereby rare earth elements are extracted from acidic solutions thereof using, as an extractant, a mixture of an alkyl (C.sub.4 -C.sub.12) phosphinic acid or salt and a tetraalkylammonium salt wherein the total number of carbon atoms in the four alkyl groups ranges from 14 to 56.

REFERENCES:
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patent: 3575687 (1971-04-01), Drobnick et al.
patent: 4647438 (1987-03-01), Sabot et al.
patent: 5015447 (1991-05-01), Fulford et al.
patent: 5338520 (1994-08-01), Leveque et al.

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