Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
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
Mee Brendan
Niebling John
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