Chemistry: electrical and wave energy – Processes and products
Patent
1975-09-24
1977-05-03
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204109, C25B 100
Patent
active
040213196
ABSTRACT:
A method of electrolytically removing silver from a photographic fixer solution comprising the steps of placing the photographic fixer solution in a cell having an anode chamber and a cathode chamber, with said chamber being separated by a diaphragm having a pore size of between about 1.0 microns to 500 microns and applying a direct current across the anode and cathode to create a current density of between about 0.001 and 5 amperes per square inch at the cathode to thereby cause argentic oxide to precipitate at the cathode and an equivalent amount of elemental sulfur to precipitate at the anode. The cell is preferably maintained at a temperature of between about 20.degree. C. and 60.degree. C. The cell can be operated as a flow cell by maintaining a hydraulic head between the chambers to determine the flow across the diaphragm. When the cell is operated as a flow cell, a minimum specific amount of photographic fixer must be conveyed to the cell to prevent oxidation of sulfur and escape of SO.sub.2 gas.
REFERENCES:
patent: 748609 (1904-01-01), Hunt
patent: 2967807 (1961-01-01), Osborne et al.
patent: 3003935 (1961-10-01), Brown
patent: 3733256 (1973-05-01), Anderson
patent: 3793168 (1974-02-01), Lilly
Andrews R. L.
Silrec Systems, Inc.
LandOfFree
Electrolytic process for recovery of silver from photographic fi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrolytic process for recovery of silver from photographic fi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrolytic process for recovery of silver from photographic fi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-343875