Metal recovery method and system for electroplating wastes

Details Metal recovery method and system for electroplating wastes Metal recovery method and system for electroplating wastes

1991-07-08

1993-03-09

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Treating process fluid by means other than agitation or...

205 99, 2041823, 2041824, 204DIG13, 210634, 210652, 210665, 210688, 210912, 210919, C02F 100

Patent

active

051924188

ABSTRACT:
The present invention relates to a method of completely recovering nickel and zinc metal from multiple plating process waste streams by first separating the waste streams into a clean, relatively constant flow and/or concentration fraction and a dirty, variable flow and/or concentration fraction. Metal is recovered from the clean fraction by ion-exchange so as to concentrate the extracted metals for direct return to the plating bath. The effluent from the ion-exchange step is then blended with the dirty, variable flow and concentration fraction. This blended flow is first neutralized and then precipitated in a two-stage process using a sodium hydroxide solution. The resultant slurry containing the metal precipitate is filtered to yield a filter cake containing recovered nickel and zinc. This filter cake can then be further processed to recover the metal for reintroduction into the plating bath or for other uses.

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