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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摘要针对帘线钢高碱度LF精炼渣中添加萤石助熔易导致氟污染及设备腐蚀等问题,采用B₂O₃替代CaF₂作为CaO-SiO₂-MgO-Al₂O₃精炼渣系的助熔剂。基于某钢厂帘线钢现行精炼渣组分,设计B₂O₃质量分数为0~10.0%的5组试验渣系,进行熔点熔速及黏度试验,以考察B₂O₃质量分数对高碱度无氟精炼渣熔化特征温度、黏度及黏流活化能的影响。利用FactSage软件模拟计算渣系高温平衡物相转变过程,并对试验渣系进行X射线衍射以及傅里叶红外光谱分析,以研究含硼无氟精炼渣的高温熔融物相演变规律。结果表明。随着B₂O₃助熔剂添加量增大,渣系熔化特征温度显著降低,同时B₂O₃可有效降低渣系黏度及黏流活化能,当其添加量(质量分数)为7.5%~10.0%时助熔效果最佳。未添加B₂O₃助熔剂的精炼渣系熔点为1 423 ℃,精炼温度下的黏度为1.11 Pa·s;当B₂O₃添加量(质量分数)达10%时,渣系熔点降至1 245 ℃,精炼温度下的黏度降至0.28 Pa·s,下降幅度分别为12.51%和74.77%。对B₂O₃助熔机理分析显示,随着B₂O₃添加量增大,渣系初始结晶相由最初的Ca₃Al₂O₆、Ca₃MgAl₄O₁₀转变为硼硅酸盐和硅酸盐结构,体系聚合度升高,同时由于渣中[BO₃]^－简单平面三角结构单元的存在,降低了熔融渣流动过程中的黏滞阻力,渣系流动性得到改善。

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	李小明
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	张欣华

关键词 ： B₂O₃助熔剂, CaO基精炼渣, 黏度, 熔化特征温度, 熔渣结构

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

收稿日期: 2023-02-02

引用本文:

李小明, 谢昊峰, 邢相栋, 马雨溦, 张欣华. B₂O₃对帘线钢高碱度LF精炼渣助熔作用[J]. 钢铁, 2023, 58(7): 80-88. LI Xiaoming, XIE Haofeng, XING Xiangdong, MA Yuwei, ZHANG Xinhua. 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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