Method and apparatus for recovering silver and plastic from used

Details Method and apparatus for recovering silver and plastic from used Method and apparatus for recovering silver and plastic from used

1981-06-22

1983-07-12

Hearn, Brian E.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75118P, 266112, 134 64P, 134104, 134109, 134 9, 134 72, C22B 1100, B29H 1900, C08J 100

Patent

active

043928897

ABSTRACT:
A method and machine for recovering silver and polyester from exposed photographic X-ray film of the type having a polyester base coated with a sheath of polyvinyladine chloride and a photosensitive silver emulsion. Sheets of the film are fed through baths of hot caustic which successively remove the silver emulsion and deposit it as a sludge from which the silver is recovered and remove the polyvinyladine coating to permit the polyester to be recovered in a commercially acceptable pure form. Where the film sheets may include some acetate based film, the apparatus will distinguish between the polyester and acetate and discard the acetate bases as scrap, after the silver emulsion has been removed.

REFERENCES:
patent: 1669394 (1928-05-01), Ellis
patent: 3647422 (1972-03-01), Wainer
patent: 3678843 (1972-07-01), Kohler
patent: 3928253 (1975-12-01), Thornton
patent: 3960550 (1976-06-01), Dusenberry
patent: 4078916 (1978-03-01), Gerber
patent: 4230404 (1980-10-01), Huss

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