Silver recovery element and method
AssigneeEastman Kodak Company
InventorsHugh G. McGuckin, John S. Badger
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Abstract
A silver recovery element (10) for treating a photographic developer solution containing silver ions comprises a substrate (20) having thereon a hydrophilic colloid layer containing physical development nuclei. The invention also comprises a process for recovering silver from a photographic developer solution containing silver ions, such process comprising contacting the solution with the silver recovery element. The contacting is for a time sufficient to reduce the concentration of silver in the solution to a desired level. The recovery element and process for its use are useful in treating a seasoned photographic developer solution containing silver ions.
Claims43
A silver recovery element for recovering silver from a photographic developer solution containing silver ions, the element comprising a water-permeable inert substrate, the substrate having thereon a hydrophilic colloid layer containing physical development nuclei.
The silver recovery element of claim 3, wherein the substrate is string and the string is positioned on the outer surface of the cylinder.
A process for recovering silver from a photographic developer solution containing silver ions, the process comprising contacting the solution with a silver recovery element, the element comprising a water-permeable inert substrate, the substrate having thereon a hydrophilic colloid layer containing physical development nuclei;
- and the contacting being for a time sufficient to reduce the concentration of silver in the solution to a desired level.
In a photographic developer recirculating system having a developer tank and a recirculating pump, the improvement wherein the developer system further comprises a silver recovery element comprising a flow-through filter, the filter comprising a cylinder having a hollow core therethrough, the cylinder having an outer surface and an inner surface and having flow channels therethrough, the outer surface having thereon a water-permeable substrate, and the substrate having thereon a hydrophilic colloid layer containing physical development nuclei.
Dependencies are inferred from the claim text.