Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Rare earth metal
Patent
1982-10-20
1984-02-21
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Rare earth metal
423263, 75101BE, C01F 1700
Patent
active
044329482
ABSTRACT:
A procedure is given for recovering yttrium and europium from phosphors or solutions which have become contaminated. An acid solution containing the yttrium, europium and impurities is passed through a cation resin exchange column until there is no longer a difference between the contaminated and effluent liquids. Yttrium and europium are then stripped from the resin exchange column using a concentrated hydrochloric acid solution. The hydrochloric acid solution containing the yttrium and europium is heated with oxalic acid to produce yttrium and europium oxalate and the oxalate is fired to produce yttrium and europium oxide.
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Carter Herbert T.
Spain Norman N.
U.S. Philips Corporation
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