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Abstract

The potential autoclave was used to study the catalytic mechanism of Cu2+ during the oxygen pressure leaching process of artificial sphalerite. By studying the potential change of the system at different temperatures and the SEM-EDS difference of the leaching residues, it was found that in the temperature range of 363–423 K, the internal Cu2+ formed a CuS deposit on the surface of sphalerite, which hindered the leaching reaction, resulting in a zinc leaching rate of only 51.04%. When the temperature exceeds 463 K, the system potential increases steadily. The increase in temperature leads to the dissolution of the CuS, which is beneficial to the circulation catalysis of Cu2+. At this time, the leaching rate of Zn exceeds 95%. In addition, the leaching kinetics equations at 363–423 and 423–483 K were established. The activation energy of zinc leaching at 363–423 and 423–483 K is 38.66 and 36.25 kJ/mol, respectively, and the leaching process is controlled by surface chemical reactions.

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Acknowledgements

This work was financially supported by the Joint Funds of the National Natural Science Foundation of China (Nos. 51804136, U1402271, 51764016), Jiangxi Province Nature Science Foundation, China (No. 20181BAB216017), Jiangxi Science and Technology Landing Project, China (No. KJLD13046), and Research Fund Program of State Key Laboratory of Rare Metals Separaten and Comprehensive Utilization, Guangzhou, China (No. GK-201803).

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Correspondence to Zhi-feng Xu or Ting-an Zhang.

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Tian, L., Gong, A., Wu, Xg. et al. Cu2+-catalyzed mechanism in oxygen-pressure acid leaching of artificial sphalerite. Int J Miner Metall Mater 27, 910–923 (2020). https://doi.org/10.1007/s12613-019-1918-2

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  • DOI: https://doi.org/10.1007/s12613-019-1918-2

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