无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2020, Vol. 52 ›› Issue (5): 27-30.doi: 10.11962/1006-4990.2019-0402

• 研究与开发 • 上一篇    下一篇

四元体系硼酸锂-硼酸钾-硼酸镁-水在308.15 K时固液相平衡研究

王居奎1,董兴锋1,赵冬1,王士强1,2(),郭亚飞1,2,邓天龙1,2   

  1. 1.天津科技大学化工与材料学院,天津 300457;
    2.天津市海洋资源与化学重点实验室
  • 收稿日期:2019-11-25 出版日期:2020-05-10 发布日期:2020-05-21
  • 通讯作者: 王士强
  • 作者简介:王居奎(1993— ),男,硕士研究生,研究方向为卤水硼资源利用。
  • 基金资助:
    国家自然科学基金项目(U1707602);国家自然科学基金项目(U1507109);国家自然科学基金项目(U1607123);国家自然科学基金项目(21773170);天津市自然基金项目(17JCYBJC19500)

Solid-liquid phase equilibria in quaternary system lithium borate-potassium borate-magnesium borate-water at 308.15 K

Wang Jukui1,Dong Xingfeng1,Zhao Dong1,Wang Shiqiang1,2(),Guo Yafei1,2,Deng Tianlong1,2   

  1. 1.College of Chemical Engineering and Material Science,Tianjin University of Science and Technology,Tianjin 300457,China;
    2.Tianjin Key Laboratory of Marine Resources and Chemistry
  • Received:2019-11-25 Online:2020-05-10 Published:2020-05-21
  • Contact: Wang Shiqiang

摘要:

采用等温溶解平衡法研究四元体系硼酸锂-硼酸钾-硼酸镁-水在308.15 K时固液相平衡,测定了体系溶解度和平衡液相的密度、折光率和pH。研究发现:该体系308.15 K时的稳定相图中包含一个共饱点(L+Li2B4O7·3H2O+K2B4O7·4H2O+Mg2B6O11·15H2O),其液相组成:w(Li2B4O7)=3.112%、w(K2B4O7)=16.64%、w(Mg2B6O11)=0.101 8%;3个固相结晶区:Li2B4O7·3H2O、K2B4O7·4H2O、Mg2B6O11·15H2O,体系无复盐或固溶体生成。溶液中硼酸锂、硼酸钾对多水硼镁石有很强的盐析效应,液相的密度、折光率和pH随溶液中硼酸盐浓度的增加呈规律性变化。

关键词: 固液相平衡, 溶解度, 水盐体系相图, 多水硼镁石

Abstract:

The phase equilibrium of the quaternary system lithium borate-potassium borate-magnesium borate-water was studied at 308.15 K with isothermal solution saturation method.Solubilities,densities,refractive indices and pH of the system were determined.Stability phase diagram of this system contains one invariant point L+Li2B4O7·3H2O+K2B4O7·4H2O+Mg2B6O11·15H2O) which liquid compositions were as follows:w(Li2B4O7)=3.11%,w(K2B4O7)=16.64% and w(Mg2B6O11)=0.10%; and three crystallization regions corresponding to Li2B4O7·3H2O,K2B4O7·4H2O and Mg2B6O11·15H2O,respectively. Neither double salts nor solid solutions formed in this system,and the K2B4O7 and Li2B4O7 in solution both had a strong salting-out effect on inderite.The solution density,refractive index and pH of the quaternary system changes regularly with the increasing of borate concentration.

Key words: solid-liquid phase equilibria, solubility, salt-water system phase diagram, inderite

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