Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1977-10-27
1979-04-24
Ozaki, G.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75101R, 75 83, 96 50R, 423 27, 423 43, C22B 1104
Patent
active
041509773
ABSTRACT:
This invention provides a method and apparatus for treating photographic film to recover silver and the plastic base layer for re-use. A wash tank containing warm water at about neutral pH contains at least one enzyme from the following group: protease, amylase, lipase. The water in the wash tank is agitated and the enzymes attack the adhesive and organic layers on the plastic base, in order to loosen and remove these materials. The film is then placed in a rinse tank containing either a weak aqueous glycol solution or a weak caustic solution which is agitated. Finally the film is removed from the rinse tank and dried. Liquid is removed from the wash tank and treated to remove silver therefrom.
REFERENCES:
patent: 3647422 (1972-03-01), Wainer
patent: 3748123 (1973-07-01), Bakker
patent: 3873314 (1975-03-01), Woo et al.
patent: 4078916 (1978-03-01), Gerber et al.
Hackh's Chemical Dictionary, McGraw-Hill, Inc., 1969, pp. 302, 303, 391, 486, 487 and 636.
Keltek Processing, Inc.
Ozaki G.
LandOfFree
Process for stripping photographic materials does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for stripping photographic materials, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for stripping photographic materials will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1989384