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Synergetic Utilization of Zinc-Bearing Dust by Carbothermic Reduction-Roasting Process: Phase Transformation and Morphological Evolution

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Abstract

An economic and effective strategy synchronously utilizing blast furnace bag dust (BF-BD) and converter-removing dust (C-RD) by carbothermic reduction roasting is reported to achieve separation and recovery of iron and zinc. In this paper, the effect of operating parameters on the recovery rate and remove rate of Fe and Zn from BD and GD was initially studied by synergetic carbothermic roasting reduction. The optimized parameters include a reduction temperature pf 1200 °C, a reduction time of 90 min, a FC/O of 2.0, and a proportion of C-RD/BF-BD of 7:3, and the removal efficiency of Zn and metallization degree of Fe reached 98.35% and 90.58%, respectively. The phase transformation and stepwise reduction behavior of wüstite (ZnO)x(FeO)1−x, spinel ZnxFe1−xAl2O4, olivine ZnxFe2−xSiO4, and gehlenite ZnzFe2−xSiAl2O7 are systematically investigated by SEM–EDS, XRD, TG/DTG, and thermodynamic analyses. It was found that the formation of wüstite (ZnO)x(FeO)1−x as an intermediates plays an crucial role in the formation of metallic Zn–Fe–C alloy. Phase transformation and reduction mechanisms of C-RD and BF-BD and the interfacial reaction formation mechanism of wüstite (ZnO)x(FeO)1−x were discussed and clarified in synergistic carbothermic reduction process.

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Acknowledgements

The authors received financial support from Key Research and Development Program of Hebei Province (19273801D), and the National Natural Science Foundation of China (52074150, 52104332).

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LG: Writing—original draft, methodology, software. YJ: Writing—review & editing. ZH: Software, funding acquisition. YS: Resources, investigation, funding acquisition.

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Correspondence to Lihua Gao.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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The contributing editor for this article was Sharif Jahanshahi.

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Jin, Y., Gao, L., He, Z. et al. Synergetic Utilization of Zinc-Bearing Dust by Carbothermic Reduction-Roasting Process: Phase Transformation and Morphological Evolution. J. Sustain. Metall. 8, 1090–1103 (2022). https://doi.org/10.1007/s40831-022-00554-4

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