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Zinc Removal from Basic Oxygen Steelmaking Filter Cake by Leaching with Organic Acids

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Abstract

The dust generated from the basic oxygen steelmaking (BOS) process is a waste material mainly containing iron that cannot be recycled owing to its high zinc content. In this study, the leaching effects of different organic acids are compared, with the aim of determining an acid that selectively leaches and removes zinc from BOS dust, so that the waste material can be recycled into ironmaking and steelmaking processes in order to substitute part of the raw materials of steelmaking. The dust used in this study was scrubbed and collected in the form of a filter cake. The acids tested were oxalic, citric, acetic, propionic, butyric, and valeric acids. Butyric acid was found to be the most effective, with a high zinc extraction level of 49.7 pct and a low iron level of only 2.5 pct. Oxalic acid was the least effective leaching reagent for both zinc and iron extractions, owing to the formation of zinc and iron oxalate precipitates following metal dissolution. The filter cake and leached residues were characterized by chemical analysis, X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy with energy dispersive spectroscpopy.

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Acknowledgments

The authors acknowledge the awarding of the CSC scholarship by the China Scholarships Council and the IPTA scholarship by the University of Wollongong to Miss Jingxiu Wang. The BOS filter cake sample used in this work was supplied by BlueScope Steelmaking Ltd. The authors would like to thank Dr. Linda Tie and Dr. Dongqi Shi for their assistance in the ICP-OES and XPS analyses. The SEM/EDS and XPS analyses were completed at the Electron Microscopy Centre, University of Wollongong.

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Authors and Affiliations

  1. School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia

    Jingxiu Wang & Guangqing Zhang

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

    Zhe Wang

  3. State Key Laboratory of Heavy Oil Processing, Faculty of Chemical Engineering, China University of Petroleum, Beijing, 102249, China

    Zhongzhi Zhang

Authors
  1. Jingxiu Wang
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  2. Zhe Wang
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  3. Zhongzhi Zhang
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  4. Guangqing Zhang
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Corresponding author

Correspondence to Jingxiu Wang.

Additional information

This study has patent pending for the technique employed.

Manuscript submitted August 2, 2018.

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Wang, J., Wang, Z., Zhang, Z. et al. Zinc Removal from Basic Oxygen Steelmaking Filter Cake by Leaching with Organic Acids. Metall Mater Trans B 50, 480–490 (2019). https://doi.org/10.1007/s11663-018-1440-3

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  • DOI: https://doi.org/10.1007/s11663-018-1440-3

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