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针对高铝钢浇铸过程中保护渣Al2O3含量大幅增加而导致保护渣玻璃形态恶化的问题,采用SEM和XRD分析方法对高铝钢浇铸前后保护渣的显微组织和结晶矿相进行分析,研究了不同组分对保护渣结晶性能的影响。结果表明:高铝钢连铸保护渣初始SiO2含量较高,保护渣玻璃形态较好。浇铸过程中随着保护渣Al2O3含量的增加和SiO2含量的减少,保护渣的结晶率增加,玻璃性能变差;渣中Li2O容易与F-生成LiF晶相;渣中CaF2含量较高时,容易析出CaF2晶体。
Aiming at the problem that the content of Al2O3 in the mold powder increases greatly during the casting of high-aluminum steel, the glass morphology of the mold powder is deteriorated. The microstructure and crystal phase of the mold powder before and after casting are analyzed by SEM and XRD. Effect of Different Components on the Crystallization Properties of Mold Flux. The results show that the initial SiO2 content of high alumina continuous casting mold powder is good, and the morphology of mold glass is good. In the casting process, with the increase of Al2O3 content and the decrease of SiO2 content, the crystallinity of the mold flux increases and the glass properties become worse. Li2O in the slag easily forms LiF phase with F-. When the content of CaF2 in the slag is high, CaF2 crystals precipitated.