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Recovery of zinc from Zn–Al–Fe alloys by gas pressure filtration

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Abstract

The recovery of zinc from galvanizing dross and the removal of iron contained dross particles by gas pressure filtration were investigated using the model of Zn–Fe–Al alloys. The majority of molten zinc was separated after filtration, and the residue intercepted by the filter consisting mostly of dross particles. The effects of the pressure differential (p), separation temperature (T) and alloy composition on the zinc recovery and iron removal were investigated. At p = 0.30 MPa and T = 723 K, 86.2 wt.% zinc was recovered from the Zn–4Al–2Fe alloy, and up to 99.9 wt.% of the iron was concentrated in the residue. Applying a higher pressure differential led to the improved filtration efficiency, and the desired separation temperature was about 723 K. The aluminum content in the Zn–Al–Fe alloy had little effect on separation efficiency, whereas increasing the iron content led to a decrease in the separation efficiency. Our findings demonstrate the potential of the gas pressure filtration method for the recovery of zinc from galvanizing dross.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51704022) and the Fundamental Research Funds for the Central Universities (FRF-TP-19-010A2).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Tian-yang Li, Zhe Wang, Lei Guo & Zhan-cheng Guo

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  1. Tian-yang Li
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  2. Zhe Wang
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  3. Lei Guo
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  4. Zhan-cheng Guo
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Correspondence to Zhe Wang or Zhan-cheng Guo.

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Li, Ty., Wang, Z., Guo, L. et al. Recovery of zinc from Zn–Al–Fe alloys by gas pressure filtration. J. Iron Steel Res. Int. 27, 1322–1330 (2020). https://doi.org/10.1007/s42243-020-00441-w

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  • DOI: https://doi.org/10.1007/s42243-020-00441-w

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