Apparatus for washing developed photographic and like films

Details Apparatus for washing developed photographic and like films Apparatus for washing developed photographic and like films

1979-05-14

1981-05-05

Ozaki, G. T.

Metallurgical apparatus

Having means for leaching and subsequently precipitating a...

75118R, 75118P, 266111, 266112, C22B 1102

Patent

active

042654319

ABSTRACT:
For recovering silver and discharging depolluted wastes from washing baths for photographic and like films or papers, a method is disclosed which consists in having the washing liquid running in countercurrent relationship in a number of serially arranged tubs, relative to the direction of advance of the photographic material being washed.
The concentration of silver salts is thus increased in a direction contrary to that of advance of the sensitive materials being processed so that the first tub of the series (considered in the machine direction) has such a concentration of silver that the recovery by any methods is economically interesting.

REFERENCES:
patent: 3705716 (1972-12-01), Hendrickson
patent: 4150977 (1979-04-01), Phillips

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