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连铸过程中保护渣的渣膜结构及结晶器传热情况对铸坯质量有重要影响,试验采用高温导热系数测定装置及结晶器渣膜黏度和热流模拟测试仪,研究不同F~-配加量渣膜的高温导热系数和矿相结构。结果表明:随F~-含量(4.22%~13.33%)的增加,渣膜的导热系数逐渐减小,对应的渣膜结晶率逐渐增大,且试验渣膜结晶率均较高,达75%以上。不同F~-含量的保护渣所对应渣膜的结晶矿物种类相同,主要为枪晶石和硅灰石。随F~-含量的增加,枪晶石析出量不断增多,晶形逐渐变大;硅灰石生成量不断减少,晶形逐渐变小。该研究成果对改善低氟保护渣浇铸的铸坯质量具有重要指导意义。
The slag film structure and the heat transfer of the mold during the continuous casting process have an important influence on the quality of the billet. The high temperature thermal conductivity measuring device and the mold slag film viscosity and heat flow simulation tester were used to study the effects of different F ~ The high temperature thermal conductivity and the phase structure of the slag film. The results show that with the increase of F ~ - content (4.22% ~ 13.33%), the thermal conductivity of the slag film decreases gradually and the corresponding crystallization rate of the slag film increases gradually, and the crystallization rate of the test slag film is higher, reaching 75% the above. Different F ~ - content of the protective slag corresponding to the same type of crystalline slag minerals, mainly gunite and wollastonite. With the increase of F ~ - content, the amount of precipitation of gunsite increases and the crystal form becomes larger; the wollastonite production decreases and the crystal form becomes smaller. The research results have important guiding significance for improving the quality of slab cast by low fluoride mold flux.