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Effects of Fe/SiO2 Ratio and MgO Content on the Viscous Behaviors of the SiO2–FeO–MgO–12 Wt Pct Fe2O3–8 Wt Pct CaO–3 Wt Pct Al2O3 Slag System

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Abstract

The present study investigated the effects of Fe/SiO2 and MgO content on the viscous behaviors of the slag formed by the charging of secondary resources into the copper-smelting furnace. It is determined that the increase of Fe/SiO2 (0.8–1.2) and the addition of MgO (1–7 wt pct) both reduce the slag viscosity. The addition of MgO accelerates the transition of breaking temperature of slags to higher temperatures, while the effect of Fe/SiO2 on that is relatively complicated. Fourier transform infrared spectroscopy (FTIR) and Raman spectra indicate that increases in either Fe/SiO2 or MgO content contribute to depolymerization of silicate network structures in high-temperature melts. The [AlO6]9− octahedra in the melt tended to increase with increasing Fe/SiO2 and MgO content, while the opposite change is observed for [FeO4]5− tetrahedra. Moreover, an increase in Fe/SiO2 or MgO content also leads to a gradual decrease in the activation energy of slag viscous flow, except in the case of Fe/SiO2 of 1.2 and MgO content of 7 wt pct. This unexpected discrepancy can be accounted for different types of flow units that arise in the slag at high temperatures.

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Acknowledgments

This work was supported by the National Key R&D Program of China (Grant No. 2018YFC1902004) and the Special Fund for the National Natural Science Foundation of China (Grant No. U1608254).

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multi-metallic Mineral of Education Ministry, Northeastern University, Shenyang, 110819, Liaoning, P.R. China

    Zhenan Jin, Baoren Wang, Zhijian Liu, Hongying Yang, Mingjun Zou & Yan Fu

  2. School of Metallurgy, Northeastern University, Shenyang, 110819, P.R. China

    Zhenan Jin, Baoren Wang, Zhijian Liu, Hongying Yang, Mingjun Zou & Yan Fu

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  1. Zhenan Jin
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  2. Baoren Wang
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  3. Zhijian Liu
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  5. Mingjun Zou
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  6. Yan Fu
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Correspondence to Baoren Wang.

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Appendix

Appendix

See Figures A1 and A2.

Fig. A1
figure 13

Effect of MgO content on the precipitation of tridymite at Fe/SiO2 of 0.8

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Fig. A2
figure 14

Effect of MgO content on the precipitation of magnesia olivine at Fe/SiO2 of 0.8

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Jin, Z., Wang, B., Liu, Z. et al. Effects of Fe/SiO2 Ratio and MgO Content on the Viscous Behaviors of the SiO2–FeO–MgO–12 Wt Pct Fe2O3–8 Wt Pct CaO–3 Wt Pct Al2O3 Slag System. Metall Mater Trans B 53, 902–915 (2022). https://doi.org/10.1007/s11663-022-02432-6

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  • DOI: https://doi.org/10.1007/s11663-022-02432-6

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