Cytec Technology Corporation

Hengli Ma

Chengye Yuan

A method is disclosed 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 an alkyl (C.sub.4 -C.sub.12) or aryl phosphonic acid or ester thereof.

Extraction of rare earth elements using alkyl phosphinic acid or

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.

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Hengli Ma