Influence of substituting B2O3 with Li2O on the viscosity, structure and crystalline phase of low-reactivity mold flux

Rongzhen Mo; Xubin Zhang; Ying Ren; Junjie Hu; Lifeng Zhang

doi:10.1007/s12613-023-2621-x

Volume 30 Issue 7

Jul. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(7): 1320-1328

Rongzhen Mo, Xubin Zhang, Ying Ren, Junjie Hu, and Lifeng Zhang, Influence of substituting B₂O₃ with Li₂O on the viscosity, structure and crystalline phase of low-reactivity mold flux, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1320-1328. https://doi.org/10.1007/s12613-023-2621-x

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Rongzhen Mo, Xubin Zhang, Ying Ren, Junjie Hu, and Lifeng Zhang, Influence of substituting B2O3 with Li2O on the viscosity, structure and crystalline phase of low-reactivity mold flux, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1320-1328. https://doi.org/10.1007/s12613-023-2621-x

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Research Article

Influence of substituting B₂O₃ with Li₂O on the viscosity, structure and crystalline phase of low-reactivity mold flux

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Corresponding authors:
Ying Ren E-mail: yingren@ustb.edu.cn

Lifeng Zhang E-mail: zhanglifeng@ncut.edu.cn
Received: 7 October 2022; Revised: 28 February 2023; Accepted: 1 March 2023; Available online: 2 March 2023

Abstract

Abstract

The low-reactivity mold flux with low SiO₂ content is considered suitable for the continuous casting of high-aluminum steel since it can significantly reduce the reaction between Al in steel and SiO₂ in mold flux. However, the traditional low-reactivity mold flux still presents some problems such as high viscosity and strong crystallization tendency. In this study, the co-addition of Li₂O and B₂O₃ in CaO–Al₂O₃–10wt%SiO₂ based low-reactivity mold flux was proposed to improve properties of mold flux for high-aluminum steel, and the effect of Li₂O replacing B₂O₃ on properties of mold flux was investigated. The viscosity of the mold flux with 2wt% Li₂O and 6wt% B₂O₃ reached a minimum value of 0.07 Pa·s. The break temperature and melting point showed a similar trend with the viscosity. Besides, the melt structure and precipitation of the crystalline phase were studied using Raman and X-ray diffraction spectra to better understand the evolution of viscosity. It demonstrated that with increasing Li₂O content in the mold flux from 0 to 6wt%, the degree of polymerization of aluminate and the aluminosilicate network structure increased because of increasing Li⁺ released by Li₂O, indicating the added Li₂O was preferentially associated with Al³⁺ as a charge compensator. The precipitation of LiAlO₂ crystalline phase gradually increased with the replacement of B₂O₃ by Li₂O. Therefore, Li₂O content should be controlled below 2wt% to avoid LiAlO₂ precipitation, which was harmful to the continuous casting of high-aluminum steels.
- low-reactivity mold flux;
- viscosity;
- structure;
- crystalline phase

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