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Effect of TiO2 on the Phase Transformation and Microstructure Evolution of Ti-Containing Melting Slag in the Alkali Fusion Process

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Abstract

The effect of TiO2 on the phase transformation and microstructure evolution of Ti-containing melting slag in the alkali fusion process has been investigated. The results showed that, after alkali fusion roasting, the original phase of Ti-containing melting slag was completely decomposed by molten NaOH, and that the alkali fusion slag mainly included Na2TiO3 and NaMO2 (M = Ti, Mg). With increasing TiO2 content, NaMO2 and Na2TiO3 converted to each other, and the content of sodium magnesium silicate also changed with the “in and out” of Mg. The contents of NaAlO2 and silicates were not significantly affected by the TiO2 content, while the microstructure of the melting slag corroded by molten NaOH changed greatly. With increasing TiO2 content, the microstructure of the alkali fusion slag transformed from an uneven grain size to a uniform grain size, and ultimately a compact structure.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (51904066), the Natural Science Foundation of Liaoning Province (2023-MS-075), and the Fundamental Research Funds for the Central Universities (N2325015).

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, China

    Jing Ma, Wei Li, Guiqin Fu & Miaoyong Zhu

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

    Jing Ma, Wei Li, Guiqin Fu & Miaoyong Zhu

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  1. Jing Ma
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  2. Wei Li
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  3. Guiqin Fu
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  4. Miaoyong Zhu
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Correspondence to Wei Li or Miaoyong Zhu.

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Ma, J., Li, W., Fu, G. et al. Effect of TiO2 on the Phase Transformation and Microstructure Evolution of Ti-Containing Melting Slag in the Alkali Fusion Process. JOM (2024). https://doi.org/10.1007/s11837-024-06558-7

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