铁矿粉与CaO同化反应性能的表征方法

Characterization method for assimilation reactions between iron ores and CaO

为解决在研究铁矿粉与CaO进行同化反应时通常采用最低同化温度这一终点体系指标来表征,而没有考虑同化反应速度和升温速率的缺陷以及采用多个指标来表征同化反应温度和速度在使用上的不便,本文充分利用铁矿粉在高温同化反应过程中获得的数据和范特霍夫规则,提出了量纲为1的同化反应特征数.该特征数包括同化反应速度、升温速率、同化温度和温度对同化反应速度的影响,可用来表征铁矿粉与CaO的同化过程中铁矿粉的同化温度、同化反应时间、同化反应结束温度等性能,并以烧结过程中的实际温度作为基准.该特征数综合了铁矿粉与CaO在同化反应过程中各重要信息,可以更全面地反映铁矿粉与CaO的同化反应性能.对两种方法得到的结果进行了比较,发现仅考虑最低同化温度这一终点指标时得到的结果相近,而采用同化反应特征数可以进一步细分出不同铁矿粉同化反应性能的差异.

The lowest assimilation temperature is usually used as a terminal system index to characterize assimilation reactions between iron ores and CaO. However, this characterization does not take into account assimilation speed and heating rate. In order to adopt several indexes to evaluate the characteristics of the assimilation reactions, this article introduces an assimilation characteristic parameter by adopting the Van＇t Hoff＇s law and making full use of data obtained in the high temperature assimilation process of iron ores. The characteristic parameter, which considers assimilation speed, heating rate, assimilation temperature and the effect of temper-ature on assimilation speed, can characterize assimilation reactions between iron ores and CaO, including assimilation starting tempera-ture, assimilation time, assimilation finishing temperature, etc. Moreover, it is based on the practical production temperature of sinte-ring ores. Because of integrating much more important information in the assimilation process of iron ores, this parameter can compre-hensively reflect the assimilation properties of iron ores. Although the same or similar results are obtained by the two methods, com-pared with the conventional method by only considering the lowest assimilation temperature, the new method can find out assimilability differences of different iron ores in further analysis.