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Influence Mechanism of Zn on the Iron Ore-Sintering Mineralization Process

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Abstract

Recovery of metallurgical dust by sintering inevitably incorporates Zn into the sintered ore, which can have a significant impact on the ore formation process and the quality of the resulting ore. Through miniature-sintering experiments and theoretical first-principles calculations, this paper analyzes in detail the influencing mechanism of Zn on the sintering mineralization process. The results showed that the lowest assimilation temperatures (LAT) of the reagent mixture did not change significantly with increasing ZnO content, the liquid-phase fluidity index (IFL), and the magnetite content in the sintered ore decreased, and the silico-ferrite of calcium and aluminum (SFCA) content increased. However, with increasing ZnFe2O4 content, the LAT, IFL, and magnetite contents of the reagent mixture increased, and the content of SFCA decreased. Since the Zn2+ adsorption energies of hematite and magnetite are higher than that of SFCA, Zn was mainly present in the hematite and magnetite in the sintered ore. In addition, Zn was doped into the hematite and magnetite crystals, resulting in a decrease in their crystalline strengths, so the microhardness values of the hematite and magnetite in the sintered ore gradually decreased with increasing Zn content.

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Acknowledgments

The authors acknowledge financial support from the National Natural Science Foundation of China (51974212).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China

    Xuheng Chen, Wei Wang, Lu Wang & Shijin Chen

  2. Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources, Wuhan University of Science and Technology, Wuhan, 430081, China

    Xuheng Chen, Wei Wang, Lu Wang & Shijin Chen

  3. Jiangsu Yonggang Group Co., Ltd., Suzhou, 215000, China

    Daiwei Yang

  4. Chair of Ferrous Metallurgy, Montanuniversitaet Leoben, Franz-Josef-Straβe 18, 8700, Leoben, Austria

    Heng Zheng

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  1. Xuheng Chen
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Chen, X., Wang, W., Yang, D. et al. Influence Mechanism of Zn on the Iron Ore-Sintering Mineralization Process. Metall Mater Trans B 54, 550–561 (2023). https://doi.org/10.1007/s11663-022-02708-x

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