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Separation of Iron and Zinc Values from Blast Furnace Dust Adopting Reduction Roasting-Magnetic Separation Method by Sawdust Pyrolysis

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Abstract

Blast furnace dust is a typical secondary resource and hazardous waste generated in the process of iron and steel production, which often contains a large amount of metal resources such as iron and zinc. In order to recycle the iron, the separation of the zinc element is the first consideration. This study proposed a process of separating iron and zinc through roasting blast furnace dust with sawdust and then magnetic separation. Thermodynamics calculated the feasibility of the reaction, and the reaction process and mechanism were explored by X-ray diffraction, thermogravimetry, and scanning electron microscopy, which determined that both fixed carbon and volatile gas control the reduction process. The roasting slag was separated by magnetic separation (350 mT), and the concentrate with the iron grade of 66.00%, the recovery rate of 85.54%, and the zinc grade of 0.15% was obtained under the conditions of roasting temperature of 700 ℃, roasting time of 30 min, and sawdust as 10% of the BFD mass. The proposed method can be effectively applied to the separation and recovery of iron and zinc in blast furnace dust, which conforms to the cleaner production of solid waste.

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Acknowledgements

This research was supported by China Ocean Mineral Resources R&D Association under Grant No. JS-KTHT-2019-01 and No. DY135-B2-15.

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Authors and Affiliations

  1. School of Civil and Resources Engineering, University of Science and Technology Bei**g, Bei**g, 100083, China

    Ben Wang, Yali Feng, **rong Ju & Yi Yang

  2. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Bei**g, 100190, China

    Ben Wang, Haoran Li, **rong Ju & Yi Yang

  3. University of Chinese Academy of Sciences, Bei**g, 100049, China

    Ben Wang, **rong Ju & Yi Yang

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Correspondence to Yali Feng or Haoran Li.

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Wang, B., Feng, Y., Li, H. et al. Separation of Iron and Zinc Values from Blast Furnace Dust Adopting Reduction Roasting-Magnetic Separation Method by Sawdust Pyrolysis. Mining, Metallurgy & Exploration 40, 1357–1368 (2023). https://doi.org/10.1007/s42461-023-00803-4

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