-15℃下Na+， K+， Mg2+//Cl-， NO3-， SO42--H2O体系相平衡研究

王雪莹; 黄雪莉; 黄河; 罗清龙; 邹雪净

doi:10.11949/0438-1157.20200059

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-15℃下Na⁺， K⁺， Mg²⁺//Cl^-， NO₃^-， SO₄^2--H₂O体系相平衡研究

热力学 | 更新时间：2026-07-24

- -15℃下Na⁺， K⁺， Mg²⁺//Cl^-， NO₃^-， SO₄^2--H₂O体系相平衡研究
- Study on phase equilibrium of system Na⁺, K⁺, Mg²⁺//Cl^-, NO₃^-, SO₄^2--H₂O at -15℃
- 化工学报 2020年71卷第11期页码：5059-5066
- 作者机构：
  
  新疆大学化学化工学院，新疆煤炭清洁转化与化工过程自治区重点实验室，新疆乌鲁木齐 830046
- 作者简介：
  
  王雪莹(1988—)，女，博士研究生，450503657@qq.com
  黄雪莉(1965—)，女，博士，教授，xuelih@163.com
- 基金信息：
  
  国家自然科学基金项目(21766033)
- DOI：10.11949/0438-1157.20200059
  中图分类号： O 642
- 收稿：2020-01-15，
  
  修回：2020-06-30，
  
  网络首发：2020-11-03，
  
  纸质出版：2020-11-05
- 稿件说明：
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王雪莹, 黄雪莉, 黄河, 罗清龙, 邹雪净. -15℃下Na⁺, K⁺, Mg²⁺//Cl^-, NO₃^-, SO₄^2--H₂O体系相平衡研究[J]. 化工学报, 2020, 71(11): 5059-5066 DOI: 10.11949/0438-1157.20200059.

WANG Xueying, HUANG Xueli, HUANG He, LUO Qinglong, ZOU Xuejing. Study on phase equilibrium of system Na⁺, K⁺, Mg²⁺//Cl^-, NO₃^-, SO₄^2--H₂O at -15℃[J]. CIESC Journal, 2020, 71(11): 5059-5066 DOI: 10.11949/0438-1157.20200059.
王雪莹, 黄雪莉, 黄河, 罗清龙, 邹雪净. -15℃下Na⁺, K⁺, Mg²⁺//Cl^-, NO₃^-, SO₄^2--H₂O体系相平衡研究[J]. 化工学报, 2020, 71(11): 5059-5066 DOI: 10.11949/0438-1157.20200059. DOI：

WANG Xueying, HUANG Xueli, HUANG He, LUO Qinglong, ZOU Xuejing. Study on phase equilibrium of system Na⁺, K⁺, Mg²⁺//Cl^-, NO₃^-, SO₄^2--H₂O at -15℃[J]. CIESC Journal, 2020, 71(11): 5059-5066 DOI: 10.11949/0438-1157.20200059. DOI：

摘要

新疆卤水硝酸盐矿主要含有Na

、K

、Mg

、Cl

、NO

、SO

六种离子，属于高元复杂体系，其合理利用和开发需要不同温度下的相平衡研究作为理论支撑。采用等温溶解平衡法，对Na

， K

， Mg

//Cl

， NO

， SO

-H

O体系在-15℃、NaCl·2H

O饱和条件下的相平衡进行了研究，并构建了相图。相图中有六个零变量点和八个两盐结晶区，只存在一种复盐KCl·MgCl

·6H

O。八个两盐结晶区，分别对应于NaCl·2H

O+Na

·10H

O、NaCl·2H

O+NaNO

、Na

Cl·2H

O+KCl、NaCl·2H

O+KNO

、NaCl·2H

O+MgSO

·7H

O、NaCl·2H

O+MgCl

·8H

O、NaCl·2H

O+Mg(NO

)

·6H

O和NaCl·2H

O+KCl·MgCl

·6H

O，其中NaCl·2H

O+Na

·10H

O共晶区最大，在低温时，硫酸钠的溶解度最小，降温过程中较易结晶析出。与该体系在25℃下的相图相比，复盐种类减少5种，零变量点减少19个，相关系得以极大简化。

Abstract

Xinjiang brine nitrate mine mainly contains six kinds of ions: Na

and SO

belonging to a high-element complex system

and its rational utilization and development require phase equilibrium studies at different temperatures as theoretical support. The phase equilibrium of the system Na

//Cl

-H

O saturated with NaCl·2H

O at -15℃ was investigated using the isothermal solution equilibrium method. According to the measured data

the phase diagrams were constructed. Only one double salt KCl·MgCl

·6H

O was found in the system. There are six invariant points and eight two-salt crystallization fields corresponding to NaCl·2H

O+Na

·10H

NaCl·2H

O+NaNO

NaCl·2H

O+KCl

NaCl·2H

O+KNO

NaCl·2H

O+MgSO

·7H

NaCl·2H

O+MgCl

·8H

NaCl·2H

O + Mg(NO

)

·6H

O and NaCl·2H

O+KCl·MgCl

·6H

O. The crystallization area of NaCl·2H

O+Na

·10H

O occupies the largest part because of its low solubility

and they will crystallize out easily from the mixed solution in the cooling process

. Compared with the phase diagram of the system at 25℃

there are 5 types of double salts reduced

19 zero variable points reduced

and the phase relationship is greatly simplified.

关键词

Keywords

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