CAJ | 학술논문

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1 s，测试期间试样表观形状（7 cm×4 cm×2 cm）和面积（100 cm2）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?8 mol·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19.07 kJ·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。
채용전도솔법측량균속선전적석고괴시양（CaSO4·2H2O，질량분수위98%）재순수중적용해속솔，수거채집시간간격1 s，측시기간시양표관형상（7 cm×4 cm×2 cm）화면적（100 cm2）기본불변。재용해과정위표면반응공제조건하，의거용해반응동역학모형，의합득도25、45、65、85℃하이수류산개용해반응속솔상수분별위1.91×10?8、3.46×10?8、4.92×10?8、7.07×10?8 mol·cm?2·s?1，반응급수위1.27。경Arrhenius공식회귀득도용해반응표관활화능위19.07 kJ·mol?1。본실험방법배제료용해과정시양면적불학정인소，의합득도적모형삼수사동역학방정계산치여실험치경위문합，경접근용해속솔이론예측문헌치。
Dissolution rate of a gypsum (CaSO4·2H2O) sample rotating in pure water was measured by automatically detecting electric conductivity of the solution, in one-second time interval of data acquisition. Superficial shape (7 cm×4 cm×2 cm) and surface area (100 cm2) of the sample were maintained constant basically during measurement. Under surface reaction-controlled dissolution experiment condition, the kinetics model was used for regression of dissolution rate constant (ks) and reaction order (n). The values of ks were 1.91× 10?8, 3.46×10?8, 4.92×10?8, 7.07×10?8 mol·cm?2·s?1 respectively for temperatures 25, 45, 65, 85℃, accommodated by a value of 1.27 for reaction order n. Consequently activation energy of dissolution reaction was correlated 19.07 kJ·mol?1 through the Arrhenius equation. Because of eliminating uncertainty of sample’s surface area in dissolution experiment, the results calculated from the kinetics equation with the model parameters regressed in this paper were more consistent with experimental value and closer to theoretical expectation of dissolution rates in literature.