Separation of Cu, Zn and Ni from Plating Solution by Precipitation of Metal Sulfides

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  • FUKUDA Tadashi
    Research Center for Advanced Waste and Emission Management, Nagoya University
  • ITO Toshihiro
    Research Center for Advanced Waste and Emission Management, Nagoya University
  • SAWADA Kayo
    Research Center for Advanced Waste and Emission Management, Nagoya University
  • KOJIMA Yoshihiro
    Research Center for Advanced Waste and Emission Management, Nagoya University
  • MATSUDA Hitoki
    Research Center for Advanced Waste and Emission Management, Nagoya University
  • SETO Fujio
    Sanshin MFG. CO., LTD.

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Other Title
  • めっき廃液に含まれるＣｕ，Ｚｎ，Ｎｉの硫化物化による沈殿分離
  • メッキ ハイエキ ニ フクマレル Cu Zn Ni ノ リュウカブツカ ニ ヨル チンデン ブンリ

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Abstract

An attempt was made to separate copper, zinc and nickel contained in plating wastewater by sulfuration treatment. Simulated plating solutions and plating wastewater from a plating industry that contained these metals at concentrations of 100 to 300 mg/dm3 were treated with sodium sulfide (Na2S).<BR> It was found that individual precipitation of metal sulfides was achieved by selective sulfuration of mixed metal solutions of copper, zinc and nickel by controlling the pH of the solutions. In the pH range of 1.4-1.5, copper was first separated from the solution as copper sulfide. Next, zinc sulfide was formed in the pH range of 2.4-2.5. Subsequently, nickel sulfide was formed in the residual solution at pH 5.5-5.6. It was also found that copper, zinc and nickel in plating wastewater could be recovered separately as metal sulfides, in a similar way to the selective sulfuration of simulated mixed metal solutions.

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