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Fe/SiO2 Ratio on the Properties, Microstructure and Fe-Containing Phases of Nickel Matte Smelting Slag

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Abstract

Due to the poor separability and low reducibility of fayalite in iron extracting from smelting waste slag, the composition of the original slag was modified for the nickel matte smelting process. Based on molecular dynamics simulation, thermodynamic calculation and experimental analyses, the influence mechanism of Fe/SiO2 ratio on physicochemical properties, Fe-containing phases and microstructure of the CaO-modified nickel matte smelting slag was investigated, to improve the FeO activity in the final slag and facilitate the subsequent iron extraction process. The results show that the SiO44− is the main form of silicon-oxygen anions in the FexO-SiO2-CaO-MgO-“NiO” slags. As the Fe/SiO2 ratio increased from 1.0 to 1.6, the fraction of SiO44− (Q0) in 15 wt pct CaO-modified nickel matte smelting slag are remarkably improved, and the degree of polymerization of silicate network is reduced correspondingly. Besides, the CaO-modified nickel slags with the Fe/SiO2 ratios of 1.2 to 1.4 present appropriate melting temperature, viscosity characteristics and interfacial tension between slag and matte. It indicates that the modified nickel slags are suitable candidates for nickel flash matte smelting. The concentration of Mg1−xFexO in 15 wt pct CaO-modified nickel slag is improved with increase of Fe/SiO2 ratio, which is conducive to the iron extraction from the smelting residues subsequently.

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Acknowledgment

The authors thank the National Natural Science Foundation of China (Nos. 51674186, 51774224) for the research support.

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Authors and Affiliations

  1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, Shaanxi Province, P.R. China

    Guohua Wang, Yaru Cui, Xiaoming Li, Junxue Zhao & Hongliang Tang

  2. Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749, South Korea

    Jian Yang

  3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Shufeng Yang

  4. CISDI Engineering Co., Ltd, Chongqing, 448000, P.R. China

    Hongliang Tang

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  1. Guohua Wang
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Correspondence to Yaru Cui or Jian Yang.

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Manuscript submitted September 15, 2020; accepted February 3, 2021.

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Wang, G., Cui, Y., Yang, J. et al. Fe/SiO2 Ratio on the Properties, Microstructure and Fe-Containing Phases of Nickel Matte Smelting Slag. Metall Mater Trans B 52, 1463–1471 (2021). https://doi.org/10.1007/s11663-021-02113-w

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