Metal recovery from spent electroless and immersion plating...

C - Chemistry – Metallurgy – 25 – C

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C25C 1/00 (2006.01) C25C 1/12 (2006.01) C25C 1/14 (2006.01)

Patent

CA 1220161

Abstract of The Disclosure A new process is disclosed which enables an effi- cient and effective recovery of dissolved metals from a spent electroless or immersion plating solution and without the use of a permeable membrane. This is accomplished, by pro- viding a bath of the spent solution in which an insoluble metal anode and a cathode of an aluminum shape are introduced, by adjusting the solution within a selected range of pH of about 2 to 12, by applying electric current to the electrodes only in an amount sufficient to restrain or inhibit chemical dissolution of the cathode by galvanic action, and impor- tantly, by maintaining the selected pH throughout the process. A directly usable pure metal deposit in the form of a film or slab is deposited on the aluminum cathode that has an adhering but peelable relation thereon. The aluminum cathode may be in the form of any suitable shape, such as a sheet, rod, plate, or wire. In a conventional process, the metal salt in solution is electrodeposited on a cathode made of the same metal that is to be extracted. However, such a process has been found to be unsatisfactory in that a coarse, powdery deposit in the nature of a metal oxide or compound results and at a very low efficiency. The deposit has to be further processed to obtain the desired pure metal. The process herein involved provides a rate of metal deposition that is considerably in excess of the 100% that can be achieved with electrolysis governed by Faraday's law, and is not based on electroplating deposition.

423914

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