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三元体系Rb+,Mg2+∥borate-H2O 348 K相平衡研究

发表时间:2013-04-15  浏览量:1325  下载量:326
全部作者: 张玉娟,曾英,于旭东,景婧,王春
作者单位: 成都理工大学材料与化学化工学院;成都理工大学矿产资源化学四川省高校重点实验室
摘 要: 采用等温溶解平衡法研究了三元体系Rb+,Mg2+∥borate-H2O 348 K时的相关系及平衡液相的主要物化性质,包括密度、折光率、pH值。根据实验数据绘制了该三元体系的稳定相图以及物化性质-组成图。该三元体系稳定相图由1个三元共饱点、2条单变量曲线和2个结晶相区组成,结晶相区对应的平衡固相分别为RbB5O8·4H2O和MgB4O7·9H2O. 研究发现:该三元体系为简单共饱型,无复盐或固溶体形成,Rb2B4O7对MgB4O7有盐溶作用,而当MgB4O7含量低时对Rb2B4O7有盐析作用,含量高时对Rb2B4O7有盐溶作用;液相物化性质随Rb2B4O7质量分数的增大呈规律性变化;密度、折光率在单变量曲线AE上随Rb2B4O7质量分数的增大而增大,在单变量曲线BE上随Rb2B4O7质量分数的增大先减小后增大,在共饱点E处达到最大值;pH值在单变量曲线AE,BE上均随Rb2B4O7质量分数的增大而减少。
关 键 词: 化学热力学;相平衡;等温溶解平衡;水盐体系;硼酸盐;铷盐
Title: Study on phase equilibrum of ternary system Rb+, Mg2+∥borate-H2O at 348 K
Author: ZHANG Yujuan, ZENG Ying, YU Xudong, JING Jing, WANG Chun
Organization: College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology; Key Laboratory of Mineral Resources Chemistry, Sichuan Higher Education Institutions, Chengdu University of Technology
Abstract: The solubilities and physicochemical properties such as densities, refractive indices and pH values of the equilibrated solution in the ternary system Rb+, Mg2+∥borate-H2O were investigated at 348 K using an isothermal solution equilibrium method. On the basis of experimental data, the stable phase diagram and the physicochemical properties vs composition diagram of the ternary system at 348 K were plotted. In the phase diagram, there were one invariant point, two univariant curves, and two crystallization fields corresponding to single salts RbB5O8·4H2O and MgB4O7·9H2O. The results showed that the ternary system belonged to simple common saturation and there was no double salt or solid solution formation. Furthermore, the salt Rb2B4O7 had salting effect on the salt MgB4O7, while the salt MgB4O7 had salting out effect on the salt Rb2B4O7 with low concentration of MgB4O7 and salting effect on the salt Rb2B4O7 with high concentration of MgB4O7. Liquid phase physicochemical properties changed regularly with the increasing of Rb2B4O7 quality fraction. Density and refractive index increased on the univariant curve AE, while decreased firstly and then increased on the univariant curve BE with the concentration increasing of Rb2B4O7, and finally reached the maximum value at the invariant point E. However, pH value was negatively correlated with the concentration of Rb2B4O7 on the curvs AE and BE.
Key words: chemical thermodynamics; phase equilibrium; isothermal solution equilibrium; salt-water system; borate; rubidium
发表期数: 2013年4月第7期
引用格式: 张玉娟,曾英,于旭东,等. 三元体系Rb+,Mg2+∥borate-H2O 348 K相平衡研究[J]. 中国科技论文在线精品论文,2013,6(7):673-678.
 
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