四元体系K+//Cl-, CO32-, B4O72-—H2O 273 K介稳相平衡研究Metastable Phase Equilibria of the Quaternary System K+//Cl-, CO32-, B4O72-—H2O at 273 K

 四元体系K+//Cl-, CO32-, B4O72-—H2O 273 K介稳相平衡研究[EB/OL]

北京：中国科技论文在线

） 摘要： 采用等温蒸发法研究了简单四元体系 K+//Cl-, CO32-, B4O72- －H2O 273 K时的介稳相平衡

该四元体系在273 K时的相图由3条溶解度单变量线、3个结晶区及1个共饱和点组成

测定了该体系273 K平衡液相中各组分的溶解度及密度

介稳相平衡

绘制了该体系的介稳相图和密度组成图

所对应的平衡液相组成为w(K2CO3)=44

85 %

） Abstract： The metastable phase equilibria of the quaternary system K+//Cl-, CO32-, B4O72-－H2O was studied at 273 K using isothermal evaporation method

Solubilities and densities of the equilibrium solution of this system were determined and the metastable equilibrium phase diagram was plotted

The phase diagram of the system consists of three univariant curves, three crystallization fields and one invariant point

This system is of eutonic type, no double salt or solid solution was formed

The three crystallization fields were corresponding to single salt K2CO3•3/2H2O, KCl and K2B4O7•4H2O, respectively

Invariant point E was saturated with salts K2CO3•3/2H2O, KCl and K2B4O7•4H2O

The mass fraction composition of the equilibrium solution corresponding to E is w(K2CO3)=44

85 %, w(KCl)=0

77 %, w(K2B4O7)=1

25 %, w(H2O)=53

13 %

Results show that the salt KCl has salting out effect to the salt K2B4O7 in the solution

Keywords： Quaternary system; Metastable phase equilibrium; Potassium; Borate; 273 K 下载PDF阅读器 PDF全文下载： 初稿 （ 122 ） 作者简介： 通信联系人： 【收录情况】 中国科技论文在线： 王瑞麟