B<sub>2</sub>O<sub>3</sub>对帘线钢高碱度LF精炼渣助熔作用

doi:10.13228/j.boyuan.issn0449-749x.20230042

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Abstract To address the problems of fluorine contamination and equipment corrosion caused by the addition of fluorspar flux to high alkalinity refining slag for cord steel, B₂O₃ was used as a flux for CaO-SiO₂-MgO-Al₂O₃ refining slag system instead of CaF₂. Based on the current refining slag components of cord steel in a steel mill, five groups of experimental slag systems with B₂O₃ mass percent ranging from 0 to 10% were designed to conduct melting point melting speed as well as viscosity tests to investigate the effect of B₂O₃ content on the melting characteristic temperature, viscosity and viscous flow activation energy of high alkalinity fluorine-free refining slag. The equilibrium phase transition process of the slag system was simulated using FactSage software, and the experimental slag system was analyzed by X-ray diffraction and Fourier infrared spectroscopy to study the molten slag phase to reveal the phase evolution of the boron-containing fluorine-free refining slag system. The results show that: with the increase of B₂O₃ addition, the melting temperature and viscosity of the slag system significantly reduced, while B₂O₃ can effectively reduce the viscosity and viscous flow activation energy of the slag system, the best flux effect will be obtained when B₂O₃ is added at 7.5%-10.0%. The refining slag melting point without B₂O₃ flux is 1 423 ℃ and the viscosity at refining temperature is 1.11 Pa·s, when the B₂O₃ flux is added to 10%, the slag melting point decreases to 1 245 ℃ and the viscosity at refining temperature decreases to 0.28 Pa·s, the decreases reach 12.51% and 74.77% respectively. The study on the mechanism of B₂O₃ flux shows that with the increase of B₂O₃ addition, the initial crystalline phase of the slag system changes from the initial Ca₃Al₂O₆,Ca₃MgAl₄O₁₀ to borosilicate and silicate structures, and the polymerization of the system increases, while the fluidity of the slag system is improved due to the presence of [BO₃]^-simple planar structural units in the slag.

Key words： B₂O₃ flux CaO-based refining slag viscosity melting characteristic temperature slag structure

Received: 02 February 2023

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	LI Xiaoming
	XIE Haofeng
	XING Xiangdong
	MA Yuwei
	ZHANG Xinhua

Cite this article:

LI Xiaoming,XIE Haofeng,XING Xiangdong等. Melting effect of B₂O₃ on high alkalinity LF refining slag of cord steel[J]. Iron and Steel, 2023, 58(7): 80-88.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230042 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I7/80

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