SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 33 ›› Issue (5): 125-131.DOI: 10.1016/j.cjche.2021.03.016

• Separation Science and Engineering • 上一篇    下一篇

Separation of As and Bi and enrichment of As, Cu, and Zn from copper dust using an oxidation-leaching approach

Erjun Zhang1, Kanggen Zhou1, Wei Chen1, Xuekai Zhang1,2, Changhong Peng1   

  1. 1 School of Metallurgy and Environment, Central South University, Changsha 410083, China;
    2 College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
  • 收稿日期:2020-12-22 修回日期:2021-03-21 出版日期:2021-05-28 发布日期:2021-08-19
  • 通讯作者: Kanggen Zhou
  • 基金资助:
    This work was financially supported by the Fundamental Research Funds for the Central South University. Postdoctoral Research Foundation of Central South University (140050037).

Separation of As and Bi and enrichment of As, Cu, and Zn from copper dust using an oxidation-leaching approach

Erjun Zhang1, Kanggen Zhou1, Wei Chen1, Xuekai Zhang1,2, Changhong Peng1   

  1. 1 School of Metallurgy and Environment, Central South University, Changsha 410083, China;
    2 College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
  • Received:2020-12-22 Revised:2021-03-21 Online:2021-05-28 Published:2021-08-19
  • Contact: Kanggen Zhou
  • Supported by:
    This work was financially supported by the Fundamental Research Funds for the Central South University. Postdoctoral Research Foundation of Central South University (140050037).

摘要: Copper dust with high arsenic content is a hazardous waste that should be treated properly. Herein, the copper dust is oxidized, leached, and separated at room temperature and atmospheric pressure. To separate As and Bi, part of As(III) in copper dust is oxidized to As(V), so that most of the As, Cu, and Zn elements enter the solution and the Bi remains in the leaching residue. Also, the influence of several factors, such as H2SO4 dosage, H2O2 dosage, liquid-solid ratio, leaching temperature and leaching time, on the leaching percentage of As, Bi, Cu, and Zn is systematically investigated. The optimal conditions are obtained as follows: liquid-solid ratio of 3:1, H2O2 dosage of 10 ml/50 g (dust), H2SO4 dosage of 4.5 ml/50 g (dust), leaching temperature of 85 C, and leaching time of 3 h. Under these conditions, the leaching percentage of As, Cu, Zn, and Bi is found to be 97.39%, 96.11%, 97.32%, and 2.40%, respectively. For further recovery of As from the leaching solution, the one-step recycle leaching of the leaching solution is performed to increase the concentration of As in the recycled leaching solution. The concentration of arsenic in the recycling leaching solution is found to be 79.63 g·L-1, which is beneficial for the study on further recovery of As2O3.

关键词: Copper dust, High arsenic content, As, Bi, Selective leaching, Enrichment

Abstract: Copper dust with high arsenic content is a hazardous waste that should be treated properly. Herein, the copper dust is oxidized, leached, and separated at room temperature and atmospheric pressure. To separate As and Bi, part of As(III) in copper dust is oxidized to As(V), so that most of the As, Cu, and Zn elements enter the solution and the Bi remains in the leaching residue. Also, the influence of several factors, such as H2SO4 dosage, H2O2 dosage, liquid-solid ratio, leaching temperature and leaching time, on the leaching percentage of As, Bi, Cu, and Zn is systematically investigated. The optimal conditions are obtained as follows: liquid-solid ratio of 3:1, H2O2 dosage of 10 ml/50 g (dust), H2SO4 dosage of 4.5 ml/50 g (dust), leaching temperature of 85 C, and leaching time of 3 h. Under these conditions, the leaching percentage of As, Cu, Zn, and Bi is found to be 97.39%, 96.11%, 97.32%, and 2.40%, respectively. For further recovery of As from the leaching solution, the one-step recycle leaching of the leaching solution is performed to increase the concentration of As in the recycled leaching solution. The concentration of arsenic in the recycling leaching solution is found to be 79.63 g·L-1, which is beneficial for the study on further recovery of As2O3.

Key words: Copper dust, High arsenic content, As, Bi, Selective leaching, Enrichment