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采用局部组成模型理论,建立了不同温度下Na+//Cl-,SO42--H2O体系的热力学模型。利用该模型对此体系在不同温度下的溶解度进行了预测,并与实验数据对比,研究了模型对于此体系多温情况的适用性。由局部组成理论中的两离子相互作用能量参数以及不同温度下体系溶解度实验数据,通过Matlab优化函数,获得不同温度下各盐的活度积和两离子混合作用参数,并利用Matlab非线性方程求解函数,预测了体系在0～150℃范围内的液固平衡数据,与实验数据及Pizter模型计算结果进行对比。研究结果表明,局部组成模型的多温适用性良好,预测结果与实验数据基本一致。
The thermodynamic model of Na + // Cl-, SO42 - H2O system at different temperatures was established by using the theory of local composition model. The solubility of the system at different temperatures was predicted by the model. Compared with the experimental data, the model was applied to investigate the applicability of the model to the multi-temperature conditions of the system. Based on the energy parameters of two-ion interaction in local composition theory and the experimental data of system solubility at different temperatures, the activity product and ion-mixing parameters of each salt at different temperatures were obtained by Matlab optimization function. The nonlinear equations of Matlab were solved Function, the liquid-solid equilibrium data of the system in the range of 0-150 ℃ are predicted, and compared with the experimental data and Pizter model calculation results. The results show that the local composition model has good applicability under multi-temperature conditions, and the prediction results are in good agreement with the experimental data.