三元体系Li^+,K^+/CO_3^(2-)-H_2O 298.15 K稳定相平衡研究  

Study on stable phase equilibrium of Li^+,K^+/CO_3^(2-)-H_2O ternary system at 298.15 K

作　　者：伍倩[1] 乜贞[1] 卜令忠[1] 余疆江[1] 穆延宗 郑绵平[1] Wu Qian;Nie Zhen;Bu Lingzhong;Yu Jiangjiang;Mu Yanzong;Zheng Mianping(MLR Key Laboratory of Saline Lake Resources and Environments,Institute of Mineral Resources,CAGS, Beijing 100037, Chin)

机构地区：[1]中国地质科学院矿产资源研究所国土资源部盐湖资源与环境重点实验室,北京100037

出　　处：《无机盐工业》2018年第6期28-31,共4页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(41203046;41473061);中国地质调查局地质调查项目(121201233000160020);中国地质科学院基本科研业务费项目(YYWF201605)

摘　　要：利用等温溶解平衡法研究了三元体系Li^+,K^+/CO_3^(2-)-H_2O在298.15 K下的稳定相平衡关系,测定了该体系的溶解度数据以及平衡液相的密度、pH和折光率等重要物化参数,并根据实验数据绘制了相图及对应的物化参数-组分含量变化图。实验结果表明:该三元体系既无复盐也无固溶体生成,相图属于简单共饱型,即由1个共饱点、2条单变量曲线和2个固相结晶区组成,结晶区分别对应Li_2CO_3和K_2CO_3。K_2CO_3对Li_2CO_3有显著的盐析效应。平衡液相的密度和折光率随溶液中K2CO3含量的变化呈现相似的变化规律。研究结果对完善含锂、钾卤水体系的热力学数据和实现富锂、钾卤水的综合开发利用具有实际意义。Stable phase equilibrium of ternary system Li~＋,K~＋/CO_3^（2-）-H_2O at 298.15 K has been studied with isothermal solution saturation method.Solubility data with corresponding phase diagram could be obtained,and physico-chemical properties of equilibrium solution changing with composition of solution could also be drawn according to the measured data,such as density,p H and refractive index.Experimental results showed that stable phase diagram of this ternary salt-water system was a simple eutectic type because there was no double salt and no solid solution being found.One invariant point,two univariant curves and two single salt crystallization fields were included in phase diagram.K_2CO_3 had obvious salting-out effect on Li_2CO_3.Physico-chemical properties（density and refractive index） showed similar change with K_2CO_3 composition changing.Research results have practical significance for improving the thermodynamic data of brine system with lithium and potassium and realizing the comprehensive development and utilization of the brine rich in lithium and potassium.

关 键 词：水盐体系 相平衡 溶解度 相图 碳酸盐型卤水 

分 类 号：TQ131.1[化学工程—无机化工]