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采用等压法测定了313.15 K下NaOH-Na2H2SiO4-H2O体系在0.5695～6.4775 mol·kg-1的离子强度范围及0.1461～0.3158的模数(SiO2与Na2O的物质的量比)范围内的等压平衡浓度,计算了该混合体系的渗透系数和水活度.用Pitzer离子相互作用模型对实验结果进行了参数化研究,拟合求取了Pitzer离子相互作用参数.用Pitzer模型计算的渗透系数值与实验结果一致,说明该模型能较好的描述NaOH-Na2H2SiO4-H2O体系的热力学性质.用Pitzer模型计算得到了该体系的各组分平均活度系数随离子强度及模数的变化规律,并与Mckay-Perring方程计算得到的NaOH的平均活度系数进行了比较,指出Mckay-Perring方程的适用性.
The isobaric pressure was used to determine the isobaric range of NaOH-Na2H2SiO4-H2O at 313.15 K in the ionic strength range of 0.5695 ~ 6.4775 mol · kg-1 and in the modulus range of 0.1461 ~ 0.3158 (SiO2: Na2O) The equilibrium concentration was calculated and the permeability coefficient and water activity of the mixed system were calculated.The Pitzer ion interaction model was used to study the parameterization of the experimental results and the Pitzer ion interaction parameters were obtained by fitting.The Pitzer model was used to calculate the permeability coefficient The experimental results show that the model can describe the thermodynamic properties of NaOH-Na2H2SiO4-H2O system better.The average activity coefficient of each component of the system is calculated by Pitzer model with the variation of ionic strength and modulus Compared with the average activity coefficient of NaOH calculated by Mckay-Perring equation, the applicability of Mckay-Perring equation is pointed out.