MgCl_(2)-CaCl_(2)-H_(2)O体系多温下的体积性质研究  

Volume Properties of the MgCl_(2)-CaCl_(2)-H_(2)O System at Various Temperatures

作　　者：路淼 陈瀚翔 边绍菊[1,2] 胡斌 LU Miao;CHEN Han-xiang;BIAN Shao-ju;HU Bin(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [2]青海省盐湖资源化学重点实验室,青海西宁810008 [3]中国科学院大学,北京100049

出　　处：《盐湖研究》2021年第2期29-34,共6页Journal of Salt Lake Research

基　　金：国家重点研发计划项目(2017YFC0602805);青海省应用基础研究项目(2019-ZJ-958Q)。

摘　　要：溶液的体积性质是工业生产中常用的控制参数,也是深层海水、盐湖卤水等天然水体系的研究所需要关注的。通过实验测量和Pitzer离子相互作用模型相结合的方法研究了283.15~323.15 K下MgCl_(2)-CaCl_(2)-H_(2)O混合溶液在不同离子强度(I=4.5,9.0,13.5 mol·kg^(-1))下的体积性质,包括混合溶液的密度、表观摩尔体积和超额体积,并用Pitzer离子相互模型拟合了MgCl_(2)-CaCl_(2)-H_(2)O混合溶液的体积参数。模型的密度计算值和实验值的差值均在±4×10^(-3) g·cm^(-3)以内,表明模型的计算值和实验值吻合良好。Volume properties of the solution are commonly used to control parameters in industrial production,which also can be used in the research of natural water systems such as deep seawater and salt lakes.The volume properties of the mixed solutions of MgCl_(2)-CaCl_(2)-H_(2)O at 283.15~323.15 K under different ionic strengths,including the density,apparent molar volume and excess volume,were studied through the combination of experimental measurement and the Pitzer ionic interaction model.The Pitzer ionic interaction model was used to fit the volume parameters of the MgCl_(2)-CaCl_(2)-H_(2)O solutions.Maximum deviations between the calculated values of the model and the experimental values are within±4×10^(-3) g·cm^(-3),indicating that the calculated values of the model are in good agreement with the experimental values.

关 键 词：氯化镁 氯化钙 体积性质 Pitzer离子相互作用模型 

分 类 号：O642.542[理学—物理化学]