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Efficient Recycling of Silver and Copper from Sintering Dust by Chlorination Roasting Process

  • Research Article-Chemical Engineering
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Abstract

In this study, the Ag and Cu evolution in the sintering dust was extracted by chlorination roasting process, and the mechanism of the process was analyzed by atomic absorption spectroscopy, X-ray fluorescence, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectrometry. In addition, in order to better understand the chlorination roasting process, the mechanism and thermodynamics of roasting reaction were analyzed. The recovery of Ag and Cu reached 99.05% and 59.32%, respectively, under the conditions of roasting temperature of 1423 K, holding time of 60 min, and the air flow rate of 400 L/h. Thermodynamic analysis showed that MgO and SiO2 could promote the production of Cl2 and HCl and that CuO could be chlorinated by Cl2 at 1421 K, but it was not amenable for HCl. Compared with CuO, Ag was more easily chlorinated at high temperatures. Experimental results indicate that silver and copper can be efficiently extracted, indicating that the chlorination roasting is a promising pyrometallurgical treatment for the recycling of sintering dust.

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Acknowledgements

Financial aid from the following programs is gratefully acknowledged: Yunan Ten Thousand Talents Plan Young & Elite Talents Project (Grant Number YNWR-QNBJ-2018-112), the Liupanshui Key Laboratory of Metallurgical Energy Saving, Environmental Protection and Recycling Economy (52020-2018-0304), and the Science and Technology Innovation Group of Liupanshui Normol University (LPSSYKJTD201801).

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Authors and Affiliations

  1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China

    Hailin Long, Kaihua Chen, Caixia Xu, Haoyu Li, Huimin Xie, Shaohua Yin, Yongmi Wang, Libo Zhang & Shiwei Li

  2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China

    Hailin Long, Kaihua Chen, Caixia Xu, Haoyu Li, Huimin Xie, Shaohua Yin, Yongmi Wang, Libo Zhang & Shiwei Li

  3. Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming, 650093, Yunnan, China

    Hailin Long, Kaihua Chen, Caixia Xu, Haoyu Li, Huimin Xie, Shaohua Yin, Yongmi Wang, Libo Zhang & Shiwei Li

  4. National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming, 650093, Yunnan, China

    Hailin Long, Kaihua Chen, Caixia Xu, Haoyu Li, Huimin Xie, Shaohua Yin, Yongmi Wang, Libo Zhang & Shiwei Li

  5. School of Chemistry and Materials Engineering, Liupanshui Normol University, Liupanshui, 553004, China

    Aiyuan Ma

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  1. Hailin Long
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  2. Kaihua Chen
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  9. Shiwei Li
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Correspondence to Shaohua Yin or Shiwei Li.

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Long, H., Chen, K., Xu, C. et al. Efficient Recycling of Silver and Copper from Sintering Dust by Chlorination Roasting Process. Arab J Sci Eng 46, 6663–6672 (2021). https://doi.org/10.1007/s13369-020-05291-y

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  • DOI: https://doi.org/10.1007/s13369-020-05291-y

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