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化工学报  2015 

二水硫酸钙溶解动力学

DOI: 10.11949/j.issn.0438-1157.20141069, PP. 1001-1006

Keywords: 二水硫酸钙,溶解,动力学,速率常数,活化能

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Abstract:

采用电导率法测量匀速旋转的石膏块试样(CaSO4·2H2O,质量分数为98%)在纯水中的溶解速率,数据采集时间间隔1s,测试期间试样表观形状(7cm×4cm×2cm)和面积(100cm2)基本不变。在溶解过程为表面反应控制条件下,依据溶解反应动力学模型,拟合得到25、45、65、85℃下二水硫酸钙溶解反应速率常数分别为1.91×10-8、3.46×10-8、4.92×10-8、7.07×10-8mol·cm-2·s-1,反应级数为1.27。经Arrhenius公式回归得到溶解反应表观活化能为19.07kJ·mol-1。本实验方法排除了溶解过程试样面积不确定因素,拟合得到的模型参数使动力学方程计算值与实验值更为吻合,更接近溶解速率理论预测文献值。

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