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Recovery of Zinc and Lead from Copper Smelting Slags by Chlorination Roasting

  • Pyrometallurgical Processing of Secondary Resources
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Abstract

Copper smelting slags are important secondary resources containing varieties of valuable metals. In this paper, CaCl2 was used as the chlorination agent to recycle Zn and Pb from copper smelting slags by chlorination roasting. The effects of temperature, holding time, the dosage of CaCl2, and the roasting atmosphere on the metal recovery ratio were investigated. The results showed that the recovery ratio of Zn and Pb reached 74.74% and 94.72%, respectively, under typical conditions. When the roasting temperature was above 1100°C, the material began to sinter or even melt with the increase of temperature, which was not conducive to the recovery of metals. An excessively long roasting time will convert chlorides into oxides and reduce the metal recovery ratio. The thermodynamic calculation results indicated that, when the temperature was higher than 850°C, the calcium introduced by the CaCl2 would be integrated with Si and Fe in the slags.

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Acknowledgements

The authors appreciate the financial support from the National Natural Science Foundation of China (No. 51620105013 and No. 51904351), Innovation-Driven Project of Central South University Hunan (No.2020CX028) and Natural Science Fund for Distinguished Young Scholar of Hunan Province, China (No. 2019JJ20031). Project (2019YFC1907400) supported by the National Key R&D Program of China.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Xueyi Guo, Beikai Zhang, Qinmeng Wang, Zhongchen Li & Qinghua Tian

  2. Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha, 410083, China

    Xueyi Guo, Qinmeng Wang & Qinghua Tian

  3. Hunan Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha, 410083, China

    Xueyi Guo, Qinmeng Wang & Qinghua Tian

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  1. Xueyi Guo
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  2. Beikai Zhang
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Correspondence to Qinmeng Wang.

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Guo, X., Zhang, B., Wang, Q. et al. Recovery of Zinc and Lead from Copper Smelting Slags by Chlorination Roasting. JOM 73, 1861–1870 (2021). https://doi.org/10.1007/s11837-021-04680-4

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  • DOI: https://doi.org/10.1007/s11837-021-04680-4

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