Electrolysis appts. for recovering silver from aq. soln. - comprising vertical tubular anode, concentric ring of vertical cathode bars, a second anode and filter for metal powder

摘要

Device for electrolytic recovery of metals, esp. Ag. from aq. solns., uses a vertical tubular anode, a cathode, a top inlet between the electrodes and a bottom outlet. The novelty comprises the use of several vertical cathode bars arranged in a circle round the anode; and between the bottom ends of the cathodes and the outlet is a filter for catching the amorphous metal powder deposited on the cathodes. The concentric ring of cathode bars is pref. located on both the outside and the inside of the tubular anode; and a second anode is used at the middle of the tank. The cathodes are pref. highly polished stainless steel bars, the anodes graphite. Used for recovery of Ag from electroplating rinsing baths, also for the recovery of other metals from aq. solns. e.g. Au, Cd, Cu. High current densities can be used so only amorphous metal powder is deposited on the cathodes; the powder is swept off the cathodes by the flow of soln. into the filler.