Liquid-solid phase equilibrium of Na+, K+, Mg2+// Cl-, SO4-2-H2O?system at -15℃

ZHU Qiaoli; HUANG Xueli

doi:10.11949/j.issn.0438-1157.20141384

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Liquid-solid phase equilibrium of Na⁺, K⁺, Mg²⁺// Cl^-, SO₄^-2-H₂O?system at -15℃

更新时间：2025-12-10

- Liquid-solid phase equilibrium of Na⁺, K⁺, Mg²⁺// Cl^-, SO₄^-2-H₂O?system at -15℃
- CIESC Journal Issue 4, Pages: 1252-1257(2015)
- 作者机构：
  
  新疆煤炭洁净转化与化工过程重点实验室, 新疆大学化学化工学院,新疆,乌鲁木齐,830046
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20141384
  CLC： 642.5+4
- Online First：05 April 2015，
  
  Published：05 April 2015
- 稿件说明：
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ZHU Qiaoli, HUANG Xueli. Liquid-solid phase equilibrium of Na⁺, K⁺, Mg²⁺// Cl^-, SO₄^-2-H₂O?system at -15℃[J]. CIESC Journal, 2015, (4): 1252-1257. DOI: 10.11949/j.issn.0438-1157.20141384.
DOI：

ZHU Qiaoli, HUANG Xueli. Liquid-solid phase equilibrium of Na⁺, K⁺, Mg²⁺// Cl^-, SO₄^-2-H₂O?system at -15℃[J]. CIESC Journal, 2015, (4): 1252-1257. DOI: 10.11949/j.issn.0438-1157.20141384. DOI：

摘要

采用等温溶解平衡法

研究了Na+

K+

Mg2+//Cl-

SO4-2-H2O

五元水盐体系在-15℃下NaCl·2H2O饱和时的相平衡关系

测定了溶解度和密度

并绘制出相应的相图。研究结果表明:该五元体系平衡相图中有3个四盐共饱点

7条单变量溶解度曲线及5个两盐结晶区

5个两盐结晶区分别对应于KCl+NaCl·2H2O、Na2SO4·10H2O+ NaCl·2H2O、MgSO4·7H2O+NaCl·2H2O、MgCl2·8H2O+NaCl·2H2O、KCl·MgCl2·6H2O+ NaCl·2H2O;所得-15℃相图和25℃下相图相比

相图结构大为简化:K2SO4·MgSO4·4H2O、KCl·MgSO4·3H2O、Na2SO4·3K2SO4、Na2SO4·MgSO4·4H2O、MgSO4·(4～6)H2O、K2SO4·MgSO4·6H2O结晶区均消失

Na2SO4结晶区转变为Na2SO4·10H2O且结晶区扩大

KCl、MgSO4·7H2O、KCl·MgCl2·6H2O结晶区缩小

MgCl2·6H2O结晶区转变为MgCl2·8H2O。在此基础上研究了不同组成的盐湖卤水在降温过程中的结晶规律

为低温盐田工艺的开发提供了理论依据。

Abstract

Solubilities and densities in the system Na+

K+

Mg2+// Cl-

SO4-2-H2O saturated with NaCl·2H2O were investigated with the isothermal method at -15℃. Based on experimental data

phase diagram and density- composition diagram were drawn. The equilibrium phase diagram of quinary system consisted of three invariant points

seven univariant curves and five crystallization fields

corresponding to solids of KCl+NaCl·2H2O

Na2SO4·10H2O+NaCl·2H2O

MgSO4·7H2O+NaCl·2H2O

MgCl2·8H2O+NaCl·2H2O and KCl·MgCl2·6H2O+ NaCl·2H2O. Compared with the phase diagram at 25℃

in the phase diagram at -15℃

the crystalline regions of K2SO4·MgSO4·4H2O

KCl·MgSO4·3H2O

Na2SO4·3K2SO4

Na2SO4·MgSO4·4H2O

MgSO4·(4-6)H2O

K2SO4·MgSO4·6H2O did not exist

the crystalline region of Na2SO4converted into the crystallization field of Na2SO4·10H2O and became larger

the crystallization fields of KCl

MgSO4·7H2O

KCl·MgCl2·6H2O decreased and the crystalline region of MgCl2·6H2O converted into the crystallization field of MgCl2·8H2O. The crystallization behavior of brines with different concentrations in the cooling process was studied. Such information could provide theoretical guidance for comprehensive utilization of salt-lake resource.

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