Treatment of metal plating wastes with an unexpanded...

Details Treatment of metal plating wastes with an unexpanded... Treatment of metal plating wastes with an unexpanded...

C - Chemistry, Metallurgy

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F

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C02F 1/42 (2006.01) B01J 39/14 (2006.01) C02F 1/72 (2006.01) C02F 9/00 (2006.01) C25D 21/22 (2006.01)

Patent

CA 1141048

BFN 6641 TREATMENT OF METAL PLATING WASTES WITH AN UNEXPANDED VERMICULITE CATION EXCHANGE COLUMN Abstract of the Disclosure Multivalent heavy metal ions are removed from metal plating waste streams by passing them through an unexpanded vermiculite cation exchange column. The column is effective to remove copper, zinc, and nickel ions and mixtures thereof. Where cyanide and cyanide- metal complexes are also present in the plating waste stream, the stream is pretreated to destroy the cyanide and cyanide complexes prior to passage through the ion exchange column.

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