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为探究CaO-SiO_2-B_2O_3-CaF_2系保护渣在连铸生产过程中发生的化学反应以及生成的主要矿相,并确定最优反应与最佳工艺条件,采用Fact Sage热力学软件对CaO-SiO_2-B_2O_3-CaF_2渣系进行热力学分析与计算,并对保护渣进行XRD检测。结果表明:采用FactSage热力学软件计算出保护渣中的主要矿相为CaSiO_3、Ca_(11)B_2Si_4O_(22)和Ca_4Si_2F_2O_7,与XRD检测结果基本一致,反应温度控制在1 553~1 633 K。该矿相流动性强、润滑效果较好,能有效提高铸坯质量,降低由于润滑不良造成漏钢的频率。
In order to investigate the chemical reactions and the main mineralogical phases of the CaO-SiO_2-B_2O_3-CaF_2 powder during the continuous casting process, and to determine the optimal reaction conditions and the optimum technological conditions, the thermal decomposition of CaO-SiO_2- B_2O_3-CaF_2 slag system for thermodynamic analysis and calculation, and XRD detection of the protective slag. The results show that the main mineralogical phases in CaO slag are CaSiO_3, Ca_ (11) B_2Si_4O_ (22) and Ca_4Si_2F_2O_7 calculated by FactSage thermodynamic software. The results are in good agreement with XRD results and the reaction temperature is controlled at 1 553-1 633 K. The mine fluidity, lubrication better, can effectively improve the quality of slab, reduce the frequency of leakage caused by poor lubrication.