Process for desilvering silver halide processing fluids

Details Process for desilvering silver halide processing fluids Process for desilvering silver halide processing fluids

1990-12-03

1992-02-04

Morris, Theodore

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 36, 75713, 75634, 75637, 75735, 75736, 210719, C22D 1104

Patent

active

050858360

ABSTRACT:
A method to reduce dissolved silver present in spent, waste, photographic processing fluids containing thiosulfate, is described. This process involves adjusting the pH to a low level prior to the addition of finely ground steel to the solution. With the pH at the low level, e.g. 2.5, the reaction of dissolved silver to precipitated silver, is facilitated. However, the pH must then be raised or neutralized, e.g. 7-8.5, in order to insure that the dissolved silver is essentially all precipitated. This material can now be safely shipped without treatment as a hazardous material and, after filtering the solids therefrom, can be safely disposed.

REFERENCES:
patent: 1448475 (1923-03-01), Weisberg
patent: 3082079 (1963-03-01), Bulloch et al.
patent: 4035181 (1977-06-01), Fisch

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