Increased in-plant recycling and lower quality raw material in terms of alkali content drive the alkali load in the blast furnace (BF) to higher levels. Excessive load of alkalis, primarily potassium, has several negative effects on the BF operation, which necessitates means to control the removal of potassium from the BF. One method to improve the removal is by increasing the potassium retention in the slag, which is controlled by the evaporation kinetics of potassium. Although several authors have studied factors affecting the evaporation rate, none of these studies have quantitatively investigated the effect of these parameters and attempted to relate these effects to slags from the industry. In the present work, a full-factorial design of experiments with three factors (B2 basicity, MgO content, and temperature) was performed, studying the evaporation of potassium from synthetic BF slag. The results suggested that multiple linear regression is suitable to describe the evaporation kinetics of potassium within the boundaries of the design of experiments. However, extrapolating to industrial slags of different compositions and additional slag components is best performed utilizing the corrected optical basicity. The corrected optical basicity showed a linear relation to the evaporation kinetics of potassium, which was related to the correlation between diffusivity and corrected optical basicity.

中文翻译：

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高炉炉渣成分和温度对钾蒸发动力学的定量影响

增加厂内回收率和降低碱含量的原材料质量将高炉 (BF) 中的碱负荷推高到更高水平。过量的碱（主要是钾）负荷对 BF 操作有几个负面影响，这需要控制从 BF 中去除钾的方法。提高去除率的一种方法是增加渣中钾的保留量，这受钾的蒸发动力学控制。尽管有几位作者研究了影响蒸发速率的因素，但这些研究都没有定量研究这些参数的影响，并试图将这些影响与工业炉渣联系起来。在目前的工作中，进行了具有三个因素（B2 碱度、MgO 含量和温度）的全因素实验设计，研究合成高炉渣中钾的蒸发。结果表明多元线性回归适用于描述实验设计范围内钾的蒸发动力学。然而，最好使用校正后的光学碱度来推断不同成分的工业炉渣和其他炉渣成分。校正光碱度与钾的蒸发动力学呈线性关系，这与扩散系数和校正光碱度之间的相关性有关。外推到不同成分的工业炉渣和附加炉渣成分最好利用校正的光学碱度进行。校正光碱度与钾的蒸发动力学呈线性关系，这与扩散系数和校正光碱度之间的相关性有关。外推到不同成分的工业炉渣和附加炉渣成分最好利用校正的光学碱度进行。校正光碱度与钾的蒸发动力学呈线性关系，这与扩散系数和校正光碱度之间的相关性有关。