化工学报 ›› 2017, Vol. 68 ›› Issue (9): 3343-3349.DOI: 10.11949/j.issn.0438-1157.20161812

• 热力学 • 上一篇    下一篇

四元体系Li+,K+,Mg2+//B4O72--H2O 273 K相平衡

桑世华1,2, 张婷婷1, 傅超1, 杨磊1   

  1. 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
  • 收稿日期:2016-12-26 修回日期:2017-04-10 出版日期:2017-09-05 发布日期:2017-09-05
  • 通讯作者: 桑世华
  • 基金资助:

    国家自然科学基金委员会-青海省人民政府柴达木盐湖化工科学研究基金项目(U1407108);四川省教育厅高校科研创新团队(15TD0009)。

Phase equilibria in quaternary system Li+, K+, Mg2+//B4O72--H2O at 273 K

SANG Shihua1,2, ZHANG Tingting1, FU Chao1, YANG Lei1   

  1. 1 College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
    2 Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu 610059, Sichuan, China
  • Received:2016-12-26 Revised:2017-04-10 Online:2017-09-05 Published:2017-09-05
  • Contact: 10.11949/j.issn.0438-1157.20161812
  • Supported by:

    supported by the National Natural Science Foundation of China-Qinghai Provincial People's Government of the Qaidam Salt Lake Chemical Engineering Research Joint Fund (U1407108) and the Scientific Research and Innovation Team in the Universities of Sichuan Provincial Department of Education (15TD0009).

摘要:

利用等温溶解平衡法研究了四元体系Li+, K+, Mg2+//B4O72--H2O 273 K相平衡关系。测定了该体系平衡时各组分的溶解度和平衡液相密度。根据实验数据和固相组成分别绘制了四元体系Li+, K+, Mg2+//B4O72--H2O 273 K时的稳定相图、水图以及相应的密度-组成图。结果表明:该体系组分之间没有形成复盐和固溶体,属于简单共饱和型体系;体系的稳定相图由1个共饱点,3条单变量曲线,3个固相结晶区组成,结晶区分别对应Li2B4O7·3H2O、K2B4O7·4H2O和MgB4O7·9H2O;平衡液相密度在共饱点处达到最大。研究还对该四元体系在273 K、288 K和348 K不同温度时的稳定相图作了对比分析和讨论。

关键词: 相平衡, 溶解性, 溶液, 四硼酸锂, 四硼酸钾

Abstract:

The stable phase equilibria of the quaternary system Li+, K+, Mg2+//B4O72--H2O at 273 K were studied using isothermal solubility equilibrium method. The solubility of the salts and densities in the system were determined, respectively. According to the experimental data and the corresponding equilibrium solid phase, the isothermal solubility diagram, water content diagram about the system Li+, K+, Mg2+//B4O72--H2O at 273 K and the corresponding density composition diagram were plotted, respectively. Experimental results show that there are no complex salt or solid solution, and the system belongs to a simple eutectic type. The phase diagram is constituted by an invariant point, three univariant solubility curves and three solid phase crystalline regions. The three solid phases crystalline regions correspond to Li2B4O7·3H2O, K2B4O7·4H2O and MgB4O7·9H2O. In addition, the density of saturated solution reached maximum at invariant point. Finally, a comparative analysis and discussion have been made in this paper for the stable phase diagrams of the system at 273 K, 288 K, and 348 K.

Key words: phase equilibrium, solubility, solution, lithium tetraborate, potassium tetraborate

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