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A novel hydrothermal method for zinc extraction and separation from zinc ferrite and electric arc furnace dust

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Abstract

A novel hydrothermal process was developed to extract zinc from pure zinc ferrite (ZnFe2O4) nanopowder and zinc-containing electric arc furnace (EAF) dust using hexahydrated ferric chloride (FeCl3·6H2O) as a decomposing agent. The effects of solid FeCl3·6H2O to ZnFe2O4 ratio by mass (R F/Z), hydrothermal reaction temperature, and time on zinc extraction were systematically investigated. In the results, when the hydrothermal reaction is conducted at 150°C for 2 h with R F/Z of 15:20, the efficiency of zinc extraction from ZnFe2O4 reaches 97.2%, and the concentration of ferric ions (Fe3+) in the leaching solution is nearly zero, indicating a high selectivity for zinc. In addition, the zinc extraction efficiency from the EAF dust reaches 94.5% in the case of the hydrothermal reaction performed at 200°C for 10 h with the solid FeCl3·6H2O to EAF dust ratio by mass (R F/EAF dust) of 15:10. Zinc and iron separation is achieved by adjusting the pH value of the leaching solution according to the different precipitation pH values of metal hydroxides.

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Authors and Affiliations

  1. Beijing Key Laboratory of Green Recycling and Extraction of Metals, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Hui-gang Wang, Yang Li, Jian-ming Gao, Mei Zhang & Min Guo

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  1. Hui-gang Wang
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  2. Yang Li
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  3. Jian-ming Gao
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  4. Mei Zhang
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Correspondence to Min Guo.

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Wang, Hg., Li, Y., Gao, Jm. et al. A novel hydrothermal method for zinc extraction and separation from zinc ferrite and electric arc furnace dust. Int J Miner Metall Mater 23, 146–155 (2016). https://doi.org/10.1007/s12613-016-1221-4

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  • DOI: https://doi.org/10.1007/s12613-016-1221-4

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