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    • 19. 发明专利
    • TREATMENT OF CHEMICAL COPPERRPLATING WASTE WATER
    • JPS55159895A
    • 1980-12-12
    • JP6793079
    • 1979-05-30
    • HITACHI CABLEHITACHI LTD
    • AIDA TAKEHISAYAMAGISHI RIYOUZOUONDA MAMORU
    • C22B15/00C02F1/70
    • PURPOSE:To quickly reduce Cu into metallic copper and remove at ordinary temperature, by a procedure in which Cu-containing waste water and Cu-containing washing water, discharged from a Cu-plating treatment process, are adjusted to have a specific pH range and then mixed with sodium hydrosulfite. CONSTITUTION:An NaOH solution or an H2SO4 solution is added to Cu-containing waste water and Cu-containing washing water, discharged from a Cu-plating treatment, to regulate the pH to 6.5-7.5, and then the waters so treated are mixed with sodium hydrosulfite to reduce Cu into metallic copper, allowed to stand for 1hr or more, mixed with a high-molecular coagulant solution with stirring to form flocs, and then subjected to a sedimentation and separation process. Thus, the treatment of the Cu-containing waste water and Cu-containing washing water can be quickly and simply performed without the need for heating device. Particularly, Cu is removed in the form of a complex and hence the method is effectively applicable to the removal of copper in waste water which cannot be separated by the neutralization method.