アンミン銅(II)存在下の亜鉛ダストのアンモニア浸出 Ammonia Leaching of Zinc Dust in the Presence of Amminecopper(II)

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著者

    • 周 康根 ZHOU Kanggen
    • 東北大学学際科学研究センター Center for Interdisciplinary Research, Tohoku University
    • 真目 薫 SHINME Kaoru
    • 住友金属工業(株)総合技術研究所 Corporate Research & Development Laboratories, Sumitomo Metal Ind., Ltd.

抄録

In the hot galvanizing process of steel pipe, so-called zinc dust, contaminated with small amounts of impurities like Fe, Pb and Cd, is generated as a by-product. Ammonia leaching is one of successful processes for recycling zinc dust. In order to improve productivity of the ammonia leaching process, dissolution behaviors of zinc have been investigated in the presence of amminecopper (II) oxidant with OCAL (Oxygen Circulating Ammonia Leaching) method.<BR>The experiments were carried out at 30-40°C and IONL/min oxygen in a 2-litter glass flask with leaching solution of 0-24g/L Cu (II), 0.5mol/L (NH<SUB>4</SUB>) <SUB>2</SUB>CO<SUB>3</SUB> and 1.0 mol/L NH<SUB>3</SUB>. It has been found that the dissolution rate of zinc remarkably increases with increasing Cu (II) concentration. Compared with the case in the absence of Cu (II), dissolution rate is speeded up more than 40 times for sheet zinc and more than 10 times for zinc dust in the presence of Cu (II). Further, it has found that the optimum molar ratio of zinc dust to Cu (II) in leaching solution is 1 to 1 for leaching of zinc dust and leaching rate remarkably decreases below or above this value. The dissolution reactions of zinc are proposed as follows.<BR>Zn+[Cu(NH<SUP>3</SUP>)<SUB>4</SUB>]<SUP>2+</SUP>→[Zn(NH<SUB>3</SUB>)<SUB>4</SUB>]<SUP>2+</SUP>+Cu<BR>Cu+Cu[(NH<SUB>3</SUB>)<SUB>4</SUB>]<SUP>2+</SUP>→2Cu[(NH<SUB>3</SUB>)<B>2</B>]+4Cu[(NH<SUB>3</SUB>)<SUB>2</SUB>]<SUP>+</SUP>+4NH<SUB>3</SUB>+4NH<SUB>4</SUB><SUP>+</SUP>+O<SUB>2</SUB>→4Cu[(NH<SUB>3</SUB>)<SUB>4</SUB>]<SUP>2+</SUP>+2H<SUB>2</SUB>O<BR>From the results of this study, it has been proved that combing Cu (II) oxidant with OCAL method is very effective for improving the ammonia leaching process of zinc dust.

収録刊行物

  • 資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan  

    資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan 113(5), p.363-366, 1997-05 

    The Mining and Materials Processing Institute of Japan

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各種コード

  • NII論文ID(NAID)
    10002283766
  • NII書誌ID(NCID)
    AN10062646
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09161740
  • NDL 記事登録ID
    4217108
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-315
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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