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›› 2013, Vol. 13 ›› Issue (1): 0-0.

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The Effects of Oxidative Pretreatment of Zinc-containing Dust on Contents of Iron and Manganese in Ammoniacal Leaching Solution and Production of Zinc Oxide

王为振 陈启元 胡慧萍 谭力铭 陈辉煌   

  1. 中南大学化学化工学院 中南大学化学化工学院冶金及应用物理化学研究所 中南大学化学化工学院 中南大学化学化工学院
  • 收稿日期:2012-11-23 修回日期:2012-12-25 出版日期:2013-02-20 发布日期:2013-02-20
  • 通讯作者: 陈启元

The Effects of Oxidative Pretreatment of Zinc-containing Dust on Contents of Iron and Manganese in Ammoniacal Leaching Solution and Production of Zinc Oxide

WANG Wei-zhen CHEN Qi-yuan HU Hui-ping TAN Li-ming CHEN Hui-huang   

  1. College of Chemistry and Chemical Engineering, Central South University College of Chemistry and Chemical Engineering, Central South University College of Chemistry and Chemical Engineering, Central South University College of Chemistry and Chemical Engineering, Central South University
  • Received:2012-11-23 Revised:2012-12-25 Online:2013-02-20 Published:2013-02-20
  • Contact: CHEN Qi-yuan

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摘要： The zinc-containing dust was oxidatively pretreated with calcium hypochlorite, subsequently leached with ammonia/ammonium bicarbonate solution to obtain the ammoniacal leaching solution, and zinc oxide was produced by ammonia distillation of the ammoniacal leaching solution and subsequent calcination. The elements of iron and manganese could not be detected in ammoniacal leaching solution, and the extraction rate of zinc was 98.2% in ammoniacal leaching process. The zinc oxide content in the product is 99.5%(w), and the contents of iron and manganese in the product were 0.0028‰ and 0.00084‰(w), respectively. The analyses of the valence states of iron and manganese in the zinc-containing dust with and without pretreatment were performed by chemical analysis and XPS, and the possible oxidation mechanism of the oxidative pretreatment of the dust was discussed. It is concluded that Fe2+-oxide and Mn2+-oxide in the dust were oxidized to Fe3+-oxide and/or its hydrate and Mn4+-oxide and/or its hydrate by calcium hypochlorite during the oxidative pretreatment process, respectively.

关键词: zinc-containing dust, oxidative pretreatment, ammoniacal leaching, zinc oxide, calcium hypochlorite

Abstract: The zinc-containing dust was oxidatively pretreated with calcium hypochlorite, subsequently leached with ammonia/ammonium bicarbonate solution to obtain the ammoniacal leaching solution, and zinc oxide was produced by ammonia distillation of the ammoniacal leaching solution and subsequent calcination. The elements of iron and manganese could not be detected in ammoniacal leaching solution, and the extraction rate of zinc was 98.2% in ammoniacal leaching process. The zinc oxide content in the product is 99.5%(w), and the contents of iron and manganese in the product were 0.0028‰ and 0.00084‰(w), respectively. The analyses of the valence states of iron and manganese in the zinc-containing dust with and without pretreatment were performed by chemical analysis and XPS, and the possible oxidation mechanism of the oxidative pretreatment of the dust was discussed. It is concluded that Fe2+-oxide and Mn2+-oxide in the dust were oxidized to Fe3+-oxide and/or its hydrate and Mn4+-oxide and/or its hydrate by calcium hypochlorite during the oxidative pretreatment process, respectively.

Key words: zinc-containing dust, oxidative pretreatment, ammoniacal leaching, zinc oxide, calcium hypochlorite

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