Process for recovering silver from photographic chemical effluen

Details Process for recovering silver from photographic chemical effluen Process for recovering silver from photographic chemical effluen

1993-02-18

1994-03-15

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

521 25, 521 30, 527312, 210670, 210679, 210681, 210683, 210688, 210690, 210691, 528341, 528342, 106168, C08L 1100, C08J 520, B01D 1500, C08C 6926

Patent

active

052946525

ABSTRACT:
A process for absorbing silver from photographic hypo solutions involves passing the hypo solution through a bed consisting of a multitude of a sponge product confined within a vessel. The sponge product is derived from an open-celled cellulosic sponge into which there has been incorporated 30% to 80% by weight of a polymer produced by the thermal interaction of polyethyleneimine (PEI) with a polycarboxylic acid. The polymer further contains an activating multivalent cation and between 90% and 300% water. Silver is eluted from the sponge product employing aqueous solutions of a complexing agent such as an ammonium compound or a cyanide compound. Following a water wash, the bed of sponge product is ready for its next cycle of silver absorption.

REFERENCES:
patent: 3580891 (1971-05-01), Rainer
patent: 3715339 (1973-02-01), Rainer
patent: 4287031 (1981-09-01), Good et al.
patent: 4332916 (1982-06-01), Thill
patent: 5002984 (1991-03-01), Rainer
patent: 5096946 (1992-03-01), Rainer
patent: 5162404 (1992-11-01), Rainer
patent: 5169883 (1992-12-01), Rainer

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