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

SANG Shihua; ZHANG Tingting; FU Chao; YANG Lei

doi:10.11949/j.issn.0438-1157.20161812

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Phase equilibria in quaternary system Li⁺, K⁺, Mg²⁺//B₄O₇^2--H₂O at 273 K

更新时间：2025-12-10

- Phase equilibria in quaternary system Li⁺, K⁺, Mg²⁺//B₄O₇^2--H₂O at 273 K
- CIESC Journal Issue 9, Pages: 3343-3349(2017)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161812
  CLC： Q131.1
- Online First：05 September 2017，
  
  Published：05 September 2017
- 稿件说明：
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SANG Shihua, ZHANG Tingting, FU Chao, et al. Phase equilibria in quaternary system Li⁺, K⁺, Mg²⁺//B₄O₇^2--H₂O at 273 K[J]. CIESC Journal, 2017, (9): 3343-3349. DOI: 10.11949/j.issn.0438-1157.20161812.
DOI：

SANG Shihua, ZHANG Tingting, FU Chao, et al. Phase equilibria in quaternary system Li⁺, K⁺, Mg²⁺//B₄O₇^2--H₂O at 273 K[J]. CIESC Journal, 2017, (9): 3343-3349. DOI: 10.11949/j.issn.0438-1157.20161812. DOI：

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。

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.

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