C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 11/00 (2006.01) C02F 1/58 (2006.01) G03C 5/395 (2006.01) G03D 3/06 (2006.01)
Patent
CA 2105416
ABSTRACT A method and apparatus for treatment of photographic effluent solutions provides a tank (1) for holding a solution of trimercapto-s-triazine or its water-soluble salt, at least one effluent tank (2) for holding overflow from a post-development photographic processing solution, a reaction and precipitate- conditioning vessel (4), means for determining when the or each effluent tank is filled to a predetermined extent, means (3) for delivering the contents of an effluent tank and an appropriate amount of the trimercapto-s-triazine solution to the reaction and precipitate-conditioning vessel (4), and means for separating the insoluble silver compound from the treated solution (6,7,8) after precipitation of an insoluble silver compound. The invention permits efficient and automated silver recovery from a photographic effluent solution having a silver concentration of 2 ppm or below.
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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