Apparatus for recovery of metals from metal plating baths and ne

Details Apparatus for recovery of metals from metal plating baths and ne Apparatus for recovery of metals from metal plating baths and ne

1977-11-15

1979-10-16

Mack, John H.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204270, 204276, 204278, 204DIG13, C25D 2104, C25D 2106, C25D 2116

Patent

active

041712552

ABSTRACT:
Method for recovering metals from cyanide and hexavalent chromium plating baths comprising immersing plated articles in a reclaiming bath containing an aldehyde or an aldehyde percursor, and optionally an oxidizing agent, to precipitate the excess metal in the residual plating bath in the form of free metal or metal hydroxide and to decompose the cyanide and to reduce the hexavalent chromium to trivalent chromium. The plating bath and reclaiming bath are regenerated. Apparatus is provided to effect this process.

REFERENCES:
patent: 2962427 (1960-11-01), Kosowsky
patent: 3649509 (1972-03-01), Morawetz et al.
patent: 3661732 (1972-05-01), Withrow
patent: 3761381 (1973-09-01), Yagishita
patent: 3985628 (1976-10-01), Myers

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