Particulation of Copper Sulfides Produced by Sulfurization of Cu-Plating Wastewater and Its Effect on Filtration Characteristics

FUKUTA Tadashi, KOJIMA Yoshihiro, MATSUDA Hitoki, SETO Fujio, YAGISHITA Koichi

doi:10.1252/kakoronbunshu.30.592

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「粒子・流体系分離工学の展開」銅めっき廃液の硫化処理による生成硫化銅の微粒化とろ過特性への影響
銅めっき廃液の硫化処理による生成硫化銅の微粒化とろ過特性への影響
ドウメッキハイエキノリュウカショリニヨルセイセイリュウカドウノビリュウカトロカトクセイエノエイキョウ

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Abstract

In order to recover metal from plating wastewater, an attempt was made to precipitate copper in the form of sulfides, which tend to form fine particulates. Model plating wastewater containing 20, 100 or 250 mg-Cu/dm³, and real plating wastewater containing Cu, Zn and Ni at concentrations of 100 mg/dm³ were employed. Na₂S, Na₂S₂ and Na₂S₄ were used as sulfurization agents at a constant pH. Particulate size and filtration characteristics of precipitated copper sulfides were investigated.<br>Results showed that copper sulfide particulates formed with Na₂S were the smallest in size and slowest in growth rate compared to those formed with Na₂S₂ and Na₂S₄. At a constant pH of 1.4-1.5, no particulates of copper sulfides were observed when the amount of Na₂S added to Cu solution was controlled below 1.5 mol/mol-Cu. On the other hand, particulates of copper sulfides were formed when the amount of Na₂S exceeded 1.0 mol/mol-Cu at pH 2.4-2.5.<br>The filtration characteristics such as the mean specific filtration resistance and compressibility coefficient of copper sulfide cakes formed with sulfides of sodium reduced in size in the order Na₂S<Na₂S₂<Na₂S₄. All copper sulfides were superior to copper hydroxide in terms of filtration characteristics, except for copper sulfides formed with Na₂S of 1.0 mol/mol-Cu at pH 2.4-2.5.

Journal

KAGAKU KOGAKU RONBUNSHU

KAGAKU KOGAKU RONBUNSHU 30 (5), 592-597, 2004

The Society of Chemical Engineers, Japan

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