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Effective separation of Zn, Fe, and Mn from roasting-water leaching solution of blast-furnace dust using a precipitation-solvent extraction process

  • Separation Technology, Thermodynamics
  • Published:
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Abstract

Selective extraction of Zn from blast furnace dust can be achieved by the ammonium sulfate roasting-water leaching process. An innovative method for effective separation of Zn, Fe, and Mn from roasting-water leaching solution of blast-furnace dust by precipitation-solvent extraction process is proposed in this research. The Fe of leaching solution was selectively converted into FePO4·2H2O precipitate by using Na2HPO4 as precipitant. The precipitation efficiency of Fe reached 99.17%, while that of Zn was only 0.20% under the solution pH of 2.2, molar ratio of Na2HPO4 to Fe of 1.2:1, reaction temperature of 30°C, and reaction time of 50 min. The zinc in the filtrate was extracted with Cyanex 302, and Zn (99.94%) was extracted through two-stage countercurrent extraction under initial pH of 3.4, Cyanex 302 concentration of 25%, and O/A of 2:1. Subsequently, Zn (99.96%) of the organic phase was stripped using 0.75 mol/L sulfuric acid by one-stage countercurrent stripping. Furthermore, according to thermodynamic calculation, it is proved that extracting Zn from sulfuric acid solution with Cyanex 302 is an exothermic reaction. The proposed process flowsheet may be used to efficiently recover Zn and Fe from blast-furnace dust.

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Acknowledgements

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

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Authors and Affiliations

  1. Civil and Resource Engineering School, University of Science and Technology Beijing, Beijing, 100083, China

    Jinrong Ju, Yali Feng & Ben Wang

  2. Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China

    Jinrong Ju & Haoran Li

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Jinrong Ju & Haoran Li

Authors
  1. Jinrong Ju
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  2. Yali Feng
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  3. Haoran Li
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  4. Ben Wang
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Correspondence to Jinrong Ju or Yali Feng.

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This article has not been published elsewhere in whole or in part. All authors have read and approved the content and agree to submit it for consideration for publication in the journal. There are no ethical/legal conflicts involved in the article. If accepted, the article will not be published elsewhere in the same form, in any language, without the written authorization of the Publisher.

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Ju, J., Feng, Y., Li, H. et al. Effective separation of Zn, Fe, and Mn from roasting-water leaching solution of blast-furnace dust using a precipitation-solvent extraction process. Korean J. Chem. Eng. 39, 3442–3451 (2022). https://doi.org/10.1007/s11814-022-1185-1

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  • DOI: https://doi.org/10.1007/s11814-022-1185-1

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