【摘要】 高炉排碱是影响高炉高效长寿的重要因素，通过实验难以模拟实际高炉的情况。FactSage软件是在对众多实验数据进行优化的基础上形成的最完备的热力学软件之一。本文基于热力学计算，系统研究了不同温度、压力、炉渣组分对炉渣碱容量的影响。结果表明：碱容量随着碱度、MgO、MgO/Al₂O₃、初始碱金属的增加而减小，Al₂O₃的影响则相反；随着碱负荷的增大，炉渣碱容量减小，但是炉渣中碱金属含量增加；碱容量随着压力的增大、温度的降低而增大；计算结果与实验结果一致。研究还发现碱度、MgO、MgO/Al₂O₃、初始碱金属和碱负荷对钾容量的影响大于对钠容量的影响，Al₂O₃的影响则相反；可以通过适当减小炉渣的碱度、MgO和MgO/Al₂O₃,适当增加炉渣中的Al₂O₃和高炉压力，适当降低炉缸温度和及时排出含有一定量碱金属的炉渣等措施提高炉渣的排碱能力。炉渣组成、压力、温度、高炉煤气成分、碱负荷与碱分压之间存在一定的关系，这为高炉碱金属危害的防治提供了一个新的思路。更多还原

【Abstract】 The blast furnace alkali drainage is an important factor affecting the high efficiency and long life of the blast furnace. It is difficult to simulate the actual blast furnace through the experiment.FactSage is one of the most complete thermodynamic software based on the optimization of many experimental data.Based on thermodynamic calculation, the effects of temperature, pressure and slag composition on slag alkali capacity were studied systematically.The results show that the alkali capacity decreases with the increase of alkalinity, MgO,MgO/Al₂O₃ and initial alkali metal, but the effect of Al₂O₃ is opposite, the alkali capacity of slag decreases with the increase of alkali load, but the content of alkali metal in slag increases.The alkali capacity increases with the increase of pressure and the decrease of temperature.It is also found that alkalinity, MgO,MgO/Al₂O₃,initial alkali metal and alkali loading have more influence on potassium capacity than on sodium capacity, while Al₂O₃ has the opposite effect, increasing the Al₂O₃ and blast furnace pressure in the slag, decreasing the temperature of hearth and discharging the slag containing alkali metal in time can improve the ability of removing alkali from the slag.There are some relations among the composition of slag, pressure, temperature, composition of blast furnace gas, alkali load and alkali partial pressure.更多还原