| 摘要 |
The present invention pertains to a method and apparatus for removing and recovering, as copper oxide, copper from a copper-containing acidic waste liquids, which contain copper ions in high concentration, said copper-containing acidic waste liquids including renewed waste liquid from a plating bath solution for manufacturing electrolytic copper foil, and etching waste liquid produced when etching copper printed circuit boards with a cupric chloride etchant. The present invention is a method in which: copper-containing acidic waste liquid is poured into and mixed with an alkaline solution having a volume at least sufficient to neutralize the copper-containing acidic waste liquid, generating a suspension containing solids composed mainly of copper oxide; and the solids composed mainly of copper oxide are then separated from the suspension, and recovered. A solution of alkali metal carbonates is used as the alkaline solution into which the copper-containing acidic waste liquid is poured. |
