Process For Recovering Precious Metals From Molecular Sieve Bodies
OwnerFred W. Bonnetinventor
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Abstract
Precious metals such as those of the platinum group can be effectively recovered from crystalline aluminosilicate supports, for example from spent catalysts, without appreciable degradation of the crystal structure by ion-exchange using a base metal ion containing medium and subsequent sequestration of the precious metal in elemental form on a nonionic cross linked borane reducing resin.
Claims6
A process for recovering precious metal from a crystalline aluminosilicate-based molecular sieve support containing the same ionic form, the process comprising contacting said molecular sieve under ion-exchange conditions with an aqueous solution of at least one metal cation substantially unreactive with a nonionic borane reducing resin, said resin comprising a solid cross-linked copolymer containing a plurality of amine- or phosphine-borane adducts, to produce an aqueous solution containing precious metal cations, recovering the crystalline molecular sieve and contacting said solution with said nonionic borane reducing resin at a temperature of from about 20° C. to about 35° C. and at a pH of greater than 1 but less than about 8 to reduce and sequester the precious metal cations as elemental values within said resin, and recovering the precious metal from said resin.
Dependencies are inferred from the claim text.