基于Pitzer模型的25℃KCl–CsCl–H_2O体系溶解度预测研究

Solubility predication in the systems of KCl–CsCl–H_2O at 25℃ using Pitzer ion-interaction model

用Pitzer离子相互作用模型计算了25℃KCl–CsCl–H2O体系溶解度,计算值与实验值相符合;并且计算了二同号正离子K、Cs之间的相互作用参数θKCs和二同号电荷和一异号电荷三离子K、Cs、Cl的相互作用参数ψKCsCl分别以±10%变动时,25℃三元体系KCl–CsCl–H2O溶解度的变化.计算结果显示,两个参数θKCs与ψKCsCl对KCl和CsCl的溶解度都有一定影响.

Component solubilities in KCI-CsCl-H2O system at 25℃ are calculated by using Pitzer ion-nteraction model. The agreement of the calculation results and the experimental data indicate that the models can be successfully used to calculate the component solubility in the system containing strontium. The paper calculates the predicted solubility results of KCI-CsCI-H2O system at 25℃ and solubility variations of the system when θKcs and YKCarlare changed with ＋10% and -10%. The calculated results indicate that OKc, s （interactions of two species with the charge） and ψKcscl （interactions of three species ） both have effect on the solubility of KCI and CsCI in the system.