四元体系Li^+,K^+//CO_3^(2-),SO_4^(2-)-H_2O 273K时介稳相平衡  

Study on Metastable Equilibria in the Quaternary System Li^+,K^+//CO_3^(2-),SO_4^(2-)-H_2O at 273 K

作　　者：桑世华[1,2] 曾晓晓[1] 王丹[1] 曲树栋[1] 

机构地区：[1]成都理工大学材料与化学化工学院,四川成都610059 [2]矿产资源化学四川省高校重点实验室,四川成都610059

出　　处：《四川大学学报（工程科学版）》2011年第4期189-193,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(40303010;40973047);教育部新世纪优秀人才资助计划(NCET-07-0125);四川省杰出青年学科带头人培养联合资助项目(08ZQ026-017)

摘　　要：采用等温蒸发法研究了Li+,K+//CO32-,SO42--H2O四元体系在低温273 K时的介稳固液相平衡关系,测定了介稳平衡液相的溶解度和密度。研究发现,该四元体系273 K时的介稳平衡相图有3个共饱和点,7条单变量曲线,5个固相结晶相区分别为K2SO4.Li2SO4,K2SO4,L i2SO4.H2O,L i2CO3和K2CO3.3/2H2O。研究结果表明在低温273K时,K2CO3溶解度大,并对其他盐类有强烈的盐析作用。The metastable equilibriua of the quaternary system Li＋,K＋//CO32-,SO42——H2O at 273 K was studied by the isothermal evaporation method.Metastable solubilities and densities of the solution were determined experimentally.Based on the experimental data,the metastable equilibrium phase diagram and water content diagram were plotted,respectively.The phase diagram in the quaternary system had three invariant points,seven univariant curves,and five crystallization fields corresponding to K2SO4·Li2SO4,K2SO4,Li2SO4·H2O,Li2CO3,and K2CO3·3/2H2O.Carbonate potassium（K2CO3） had the biggest solubility and strong salting-out effect on other salts.

关 键 词：水盐体系 介稳相平衡 溶解度 钾盐 

分 类 号：TQ013[化学工程]