PROCESS FOR METALS RECOVERY WITH SIMULTANEOUS NEUTRALIZATION OF TOXIC AQUEOUS WASTES,CONCENTRATED PLATING SOLUTION AND TOXIC VAPOURS IN VENTILATION SYSTEMS AND APPARATUS THEREFOR

摘要

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.