LiCl-MgCl_(2)-H_(2)O及其子体系多温下体积性质研究  

Volumetric Properties of the Binary Systems(LiCl-H_(2)O and MgCl_(2)-H_(2)O)and the Ternary System(LiCl-MgCl_(2)-H_(2)O)from 273.15 K to 308.15 K

作　　者：戈海文[1,2] 杨红军 王敏[1,2] GE Hai-wen;YANG Hong-jun;WANG Min(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)

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

出　　处：《盐湖研究》2022年第4期15-29,共15页Journal of Salt Lake Research

基　　金：National Natural Science Foundation of China(No.U1707601);Major Research and Development Project of China[No.2018YFC0604804].

摘　　要：用高精度振动管密度仪测定二元系统(LiCl-H_(2)O和MgCl_(2)-H_(2)O)和三元系统(LiCl-MgCl_(2)-H_(2)O)在273.15至308.15 K下溶液密度。采用VFT方程关联了LiCl和MgCl_(2)溶液密度与温度、摩尔浓度关系。利用Young理想混合规则,根据二元体积性质计算计算了三元系统溶液密度。采用Pitzer离子相互模型拟合了LiCl-MgCl_(2)-H_(2)O,得到Pitzer单盐参数(β_(MX)^((0)V),β_(MX)^((1)V),and C_(MX)^(V),MX=LiCl和MgCl_(2))和混合离子相互作用参数(θ_(Li,Mg)^(V)、ψ _(Li,Mg,Cl)^(V))。在本工作中确定了三元体系在恒定离子强度下的混合体积(ΔV_(m))。The densities for two binary systems(LiCl-H_(2)O and MgCl_(2)-H_(2)O)and the ternary system(LiCl-MgCl_(2)-H_(2)O)over the temperature range from 273.15 to 308.15 K at intervals of 5 K were experimentally determined with a high precision vibrating-tube densitometer.Based on the Vogel-Fulcher-Tamman(VFT)equation,the coefficients of the correlation equation for densities of LiCl(aq)and MgCl_(2)(aq)against temperature and molality were parameterized.The ideal mixing rule of Young was successfully applied to correlate the densities of the ternary system based on relevant binary solution properties.On the basis of volumetric property data of the binary and ternary systems,the Pitzer single-salt parameters(β_(MX)^((0)V),β_(MX)^((1)V),and C_(MX)^(V),MX=LiCl and MgCl_(2))and mixing ion-interaction parameters(θV Li,Mg,ψV Li,Mg,Cl)were parameterized according to Pitzer ion-interaction theory of single salt and mixture electrolytes,respectively.The volumes of mixing(ΔV m)at constant ionic strength were determined for the ternary system in the present work.

关 键 词：密度 体积特性 PITZER模型 氯化锂 氯化镁 

分 类 号：O642.42[理学—物理化学]