Removal of cadmium and arsenic from Cd-As-Pb-bearing dust based on peroxide leaching and coprecipitation
- 点击次数：
- 影响因子：4.217
- DOI码：10.1016/j.hydromet.2022.105839
- 发表刊物：Hydrometallurgy
- 关键字：Arsenic, Cadmium, Lead dust, Coprecipitation, Separation
- 摘要：As a byproduct of lead metallurgy, Cd-As-Pb-bearing dust, is a hazardous waste. This paper proposes a coprecipitation method for Cd and As removal and applies it to dust disposition. First, a thermodynamic analysis of the Cd2+-AsO43− -H2O system was conducted, and the predominant areas of solid phase, including Cd5H2(AsO4)4, Cd3(AsO4)2 and Cd(OH)2, were obtained at different molar ratios of cadmium to arsenic (nCd/nAs). Second, the effects of nCd/nAs ratio and pH on the precipitation behaviors of Cd and As were examined. The precipitated solids varied from Cd5H2(AsO4)4•4H2O to Cd3(AsO4)2•4H2O and then to amorphous Cd(OH)2 with increasing pH. The morphology of solids transformed from cuboid to flake particles and then to fine agglomerated particles. Perfect removal of Cd and As can be achieved by generating Cd5H2(AsO4)4•4H2O with molar ratios of nCd/nAs 1.25 at pH 5.5 or Cd3(AsO4)2•4H2O with nCd/nAs 1.50 at pH 7.5. Finally, a method of H2O-H2O2 leaching and Cd-As coprecipitation was proposed to treat Cd-As-Pb-bearing dust. The precipitation efficiencies of Cd and As were higher than 99.7%. This work improved a one-step method for removing toxic Cd and As from polymetallic dust and other materials.
- 论文类型：期刊论文
- 学科门类：工学
- 一级学科：冶金工程
- 文献类型：J
- 卷号：209
- 页面范围：105839
- 是否译文：否
- 发表时间：2022-02-17
- 收录刊物：SCI
