Process for recovering silver from photographic solutions
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United States of America Patent
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Aug 21, 2001
Grant Date -
N/A
app pub date -
Dec 17, 1999
filing date -
Dec 17, 1999
priority date (Note) -
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Abstract
Silver recovery from a silver-bearing spent photographic solution is achieved by reducing the silver ions to silver metal with an organic reducing agent, especially a photographic developer reagent; in particular a spent photographic developer solution provides a convenient source of reducing agent for the silver recovery; in this case the developer reagents which typically are phenol-type compounds are oxidized leading to a less toxic discharge effluent having a lower COD and BOD.
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