Abstract
Abstract For an effective electrolytic recovery of silver from photographic fixing solutions, polarization measurements and potentiostatic electrolysis were carried out using active carbon as a fluidized bed electrode. The optimum conditions, determined by the electrolytic recovery, required a static bed height was 4 mm, a bed expansion rate 14%, and an initial set potential −0.84 V vs. SCE. The current efficiency in this case was about 75%, and the limiting concentration for recovery of silver was about 5 ppm. The electrolytic duration for recovery of the silver was reduced to about half by enlarging the electrolytic cell. Other products formed during the electrolysis were hydrogen sulfide (H2S) and silver sulfide (Ag2S). When silver deposited under the optimum conditions was dissolved in 5M-HNO3 (1M=1 mol dm−3) of 100 ml, the recovery efficiency of the silver was about 75%.
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