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| Effect of BaO and MgO on structure and properties of aluminate slag with various CaO/Al2O3 ratios |
| Yu-qi Kong1, Ting Wu1,2, Wen-zhi Xia1, Wen Yang1, Hai-chuan Wang1,2 |
1 School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, Anhui, China
2 Key Laboratory of Metallurgical Emission Reduction and Resource Recycling (Ministry of Education), Anhui University of Technology, Ma’anshan 243002, Anhui, China |
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Abstract To provide theoretical guidance for performance stability control of low-reactive mold fluxes, the effects of BaO and MgO on the structure and properties of aluminate slag with various CaO/Al2O3 (C/A) ratios were investigated using the Fourier transform infrared spectrometer, Raman spectroscope, hemispherical melting point instrument, rotational viscometer and X-ray diffractometer. The results indicated that with BaO and MgO addition, the structure polymerization was first weakened and then enhanced at C/A of 1.1, and the transition contents corresponded to 8 wt.% BaO and 2 wt.% MgO, respectively, while the structure polymerization decreased continuously at C/A of 1.3. Since the viscosity change was well consistent with the structure evolution, the polymerization degree played a more prominent role in the slag viscosity than superheat degree when the melting temperature difference was within 40 °C. The break temperature decreased initially and then increased with augment of BaO and MgO at C/A of 1.1, while it manifested a decrease trend with BaO addition, and it decreased obviously but then turned to increase with MgO increment at C/A of 1.3. The crystallization phase and crystallization ratio kept stable with BaO increment, while the crystallization ratio rose greatly with MgO promoting LiAlO2 precipitation at C/A of 1.1. The crystal types of all experimental slags were mainly Ca12Al14O33 and CaF2 at C/A of 1.3, and the precipitation of crystalline phase BaAl2O4 demonstrated a rising trend, while that of Ca12Al14O33 gradually declined with BaO augment.
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Received: 11 November 2022
Published: 25 January 2024
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| Cite this article: |
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Yu-qi Kong,Ting Wu,Wen-zhi Xia, et al. Effect of BaO and MgO on structure and properties of aluminate slag with various CaO/Al2O3 ratios[J]. Journal of Iron and Steel Research International, 2024, 31(1): 204-214.
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2024, Vol. 31 
