Process and apparatus for electrowinning of heavy metals...

Details Process and apparatus for electrowinning of heavy metals... Process and apparatus for electrowinning of heavy metals...

C - Chemistry, Metallurgy

25

C

C25C 1/12 (2006.01) C23F 1/46 (2006.01) C25C 1/08 (2006.01) C25C 7/02 (2006.01)

Patent

CA 2052933

A novel bipolar cell is described together with a method for employing the same in the electrowinning of heavy metals (copper, nickel, cobalt and the like) from baths such as etchants, electroless plating baths and the like. In a particular application, the bipolar cell is used to regenerate a chloride-based ammoniacal copper etching bath by electrowinning a portion of the copper therein. The regeneration is accomplished without generating any significant amount of gaseous chlorine. The regeneration of the sapper etching bath in this manner is used in a closed loop system far maintaining at a substantially constant level the amount of copper present in an operating ammoniacal chloride sapper etchant bath.

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