CaO-SiO2-Al2O3-MnO系低熔点区域控制
Control on low melting point area in a CaO-SiO2-Al2O3-MnO system
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摘要: 通过热力学计算软件FactSage计算分析了CaO-SiO2-Al2O3-MnO四元系夹杂物低熔点区域的控制范围.从控制夹杂物成分的角度,指出随着Al2O3含量和CaO含量的增加,夹杂物低熔点区域大小都是先增大后减小;随着SiO2含量和MnO含量的增加,夹杂物低熔点区域增大.为了得到低熔点夹杂物,应控制SiO2-Al2O3-CaO-MnO系中Al2O3质量分数为20%左右,CaO质量分数在25%~30%之间;同时控制CaO/SiO2比值为0.8~1,SiO2质量分数应为30%左右.Abstract: The compositions of low melting point inclusions in a CaO-SiO2-Al2O3-MnO system were calculated and analyzed by thermodynamic software FactSage. The results show that the area of low melting point inclusions first increases then decreases with the alumina and calcium oxide contents accumulating. However, it always increases with the silica and manganese oxide contents rising. To obtain low melting point inclusions, the alumina and silica contents should be approximately controlled to 20% and 30%, respectively, the CaO content restricted to 25%-30%, and CaO/SiO2 should be 0.8-1.
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