Optimization of pressurized deep leaching process of zinc leaching residue and kinetics analysis of zinc leaching

被引：0
|
作者：
Zhang Z.-Y. [1 ]
Li C.-X. [1 ]
Zhang Y.-Y. [1 ]
Liu Q. [1 ]
Li C.-W. [1 ]
Gu Z.-H. [1 ]
Mao L.-B. [1 ]
机构：
[1] Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2023年 / 33卷 / 11期
基金：
中国国家自然科学基金;
关键词：
leaching kinetics; pressurized acid leaching; zinc leaching rate; zinc leaching residue;
D O I：
10.11817/j.ysxb.1004.0609.2022-43854
中图分类号：
学科分类号：
摘要：
In light of the key technical issues, such as low valuable metal recovery rates and large amounts of hazardous iron containing slag generated during the treatment of zinc leaching residue, this paper proposed a two-stage countercurrent pressurized acid leaching process of zinc leaching residue: Ⅰ section low acid pressure leaching for iron control and Ⅱ section deep high acid pressure leaching. The dynamic behavior of zinc leaching in the Ⅱ stage high-acid pressure leaching process was deeply studied. The effects of reaction temperature, sulfuric acid concentration, stirring speed and oxygen partial pressure on zinc leaching rate and zinc leaching kinetics were investigated, respectively. The results show that the zinc leaching rate can reach 96.73% after 180 min of leaching under the conditions of reaction temperature 150 ℃, initial sulfuric acid concentration 100 g/L, stirring speed 500 r/min and oxygen partial pressure 0.4 MPa. The leaching process of zinc in the pressure acid leaching process of zinc leaching residue can be described by the unreacted nuclear shrinkage model without solid product layer, and the reaction rate of the process is controlled by external diffusion. The apparent activation energy is 9.61 kJ/mol. © 2023 Central South University of Technology. All rights reserved.
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页码：3838 / 3850
页数：12
相关论文
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