Abstract：
The crystallization and viscosity of modified blast furnace slag are key factors in fiber forming conditions. In this paper, the crystallization behavior of modified blast furnace slag under continuous cooling conditions was studied by differential scanning calorimetry, and its crystallization kinetics with different acidity coefficients were established. On this basis, the evolution law of the crystallization phase and the influence of crystallization on the viscosity of modified blast furnace slag with different acidity coefficients were analyzed. The results indicated that the crystallization phases of slag with acidity coefficients of 1.05 and 1.20 were, respectively, Melilite and Anorthite. During the cooling process at the acidity coefficient of 1.05, the critical rates of precipitation of Melilite and Anorthite were 50 °C/s and 20 °C/s, respectively, while they were 20 °C/s and 15 °C/s, respectively, at the acidity coefficient of 1.20. With the increase of the acidity coefficient, the crystal growth mode of slag changed from two-dimensional and three-dimensional mixed crystallization to surface nucleation and one-dimensional crystallization. The crystallization activation energy of slag with acidity coefficients of 1.05 and 1.20 were 698.14 kJ/mol and 1292.50 kJ/mol, respectively. In addition, the change trend of viscosity was related to crystal size and content.
摘要：
改性高炉渣的结晶和粘度是纤维形成条件的关键因素。在本文中,用差示扫描量热法研究了改性高炉渣在连续冷却条件下的结晶行为,建立了不同酸度系数下的结晶动力学。在此基础上,分析了不同酸度系数改性高炉渣结晶相的演变规律及结晶对粘度的影响。结果表明,酸度系数为1.05和1.20的矿渣结晶相,分别,菱铁矿和钙长石。在酸度系数为1.05的冷却过程中，金线石和钙长石的临界沉淀速率分别为50°C/s和20°C/s，分别,虽然它们是20°C/s和15°C/s，分别,酸度系数为1.20。随着酸度系数的增加,炉渣的晶体生长模式由二维和三维混合结晶转变为表面成核和一维结晶。酸度系数为1.05和1.20的炉渣的结晶活化能分别为698.14kJ/mol和1292.50kJ/mol,分别。此外,粘度的变化趋势与晶体尺寸和含量有关。
