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化学学报
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化学学报 ›› 1994, Vol. 52 ›› Issue (10): 954-959. 上一篇    下一篇

研究论文

四元体系Li^+,K^+,Mg^2^+/SO~4^2^--H~2O25℃相关系和溶液物化性质的研究

房春晖;李冰;李军;王庆忠;宋彭生   

  1. 中国科学院青海盐湖研究所
  • 发布日期:1994-10-15

Studies on the phase diagram and solution properties for the quarternary system Li^+,K^+,Mg^2^+/SO~4^2^--H~2O at 25℃

FANG CHUNHUI;LI BING;LI JUN;WANG QINGZHONG;SONG PENGSHENG   

  • Published:1994-10-15

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用等温溶解平衡法研究了四元体系Li^+,K^+,Mg^2^+/SO~4^2^--H~2O 25℃溶解度,测定了饱和溶液的密度,粘度,折光率,pH和电导率等物化性质. 四元体系相图由六条溶解度分枝线和五个结晶区构成,分别对应于原始组分和复盐Li~2SO~4·K~2SO~4,K~2SO~4·MgSO~4·6H~2O,没有发现新的复盐或固溶体, 也没有发生原始组分的脱水作用,用现代电解质溶液理论-Pitzer模型校验该体系的溶解度测定值, 结果令人满意

关键词: 相平衡, 水, 溶解度, 四元系, 硫酸钾, 相图, 硫酸镁, 硫酸锂, 物化性质, PITZER模型

Solubilities of the quaternary system Li+, K+, Mg2+/SO42--H2O were investigated by isothermal method at 25癈. Physico-chem. properties of solns., such as d., refractive index, viscosity, conductivity, and pH, were determine Phase diagram of the title system consists of six solubility branches and five crystallization fields corresponding to arcanite, lithium sulfate monohydrate, epsomite, picromerite, and double salt (Li2SO4譑2SO4). Pitzer model of electrolyte solution was used for parameterization from results of solubility determination for subsystems and the prediction of solubilities for the quaternary system was made. Good agreement with published data was obtained.

Key words: PHASE EQUILIBRIUM, WATER, SOLUBILITY, QUATERNARY SYSTEM, POTASSIUM SULFATE, PHASE DIAGRAM, MAGNESIUM SULFATE, LITHIUM SULFATE

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