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Leaching behavior of germanium presented in different phases from zinc oxide dust under atmospheric acid leaching conditions

  • Chunlin Chen , Yong Zhen , Chunlin Li , Chang Wei EMAIL logo , Minting Li , Zhigan Deng and Xingbin Li
Published/Copyright: September 28, 2023

Abstract

Recovering germanium from zinc oxide dust (ZOD) produced from Pb–Zn smelter is an important pathway to extract germanium. However, the leaching efficiency of industrial germanium production is not satisfactory (usually less than 75 %). Therefore, the leaching behavior of Ge in different phases was discovered in this work. Ge in the ZOD mainly occurs in oxide, sulfide, silicate, and solid insoluble. The potential decides the oxidative dissolution of sulfide. The leaching recovery of zinc and germanium were 90 % and 80 % with oxidant, and 78 % and 80 % without oxidant, respectively. The effect sequence of oxidant type on the Zn leaching efficiency was MnO2 > H2O2 ≈ oxygen > air, but the type and addition of oxidant had no obvious effect on the leaching recovery of germanium. The final pH of leaching slurry limits the dissolution of oxide and hydrolysis-polymerization of impurity ions (such as Fe(III) and Si). Decreasing the final pH is beneficial to the leaching reaction of Zn and Ge. The germanium presented in oxide and sulfide is easy to leach, while the leaching of germanium existed in silicate and solid insoluble is relatively difficult. The structure of aluminate can be destroyed effectively using a 40 g/L HF solution. When the leaching percent of SiO2 is 86.82 %, the leaching recovery of Ge is 96.57 %. For the ZOD with higher content of Fe and Si, germanium leaching is negatively correlated with the content of Fe and Si in the ZOD. The results provide a scientific basis for improving the leaching recovery of germanium.


Corresponding author: Chang Wei, Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China, E-mail:

Award Identifier / Grant number: 52164039

Funding source: National Natural Science Foundation of China 51964031

Award Identifier / Grant number: Minting Li

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was funded by the National Natural Science Foundation of China (Grants 52164039).

  3. Conflict of interest statement: The authors declare that they have no known conflict financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Received: 2023-01-15
Accepted: 2023-05-29
Published Online: 2023-09-28

© 2023 Walter de Gruyter GmbH, Berlin/Boston

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