Method for recovering photographic and industrial waste

Details Method for recovering photographic and industrial waste Method for recovering photographic and industrial waste

1994-02-14

1995-02-14

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204111, C25C 100

Patent

active

053892127

ABSTRACT:
Exposed photographic or X-ray film is agitated in a warm leaching bath which causes the silver-bearing emulsion to be removed from the film's plastic substrate in the form of a liquid concentrate which is cycled repeatedly through a first electrolytic extractor the cathode of which collects silver granules of approximately 80%-90% purity. The granules are collected and ball milled to approximatley a twenty (20) mesh consistency, and are transferred to a dilute nitric acid bath which converts the silver to a silver nitrate solution. When the solution of a silver nitrate has a neutral pH, it is filtered and subjected to a second electrolytic process which produces silver having a purity of approximately 0.999 fine.

REFERENCES:
patent: 3510413 (1970-05-01), Lindau
patent: 5238543 (1993-08-01), Onlin

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