Solid-liquid phase equilibria in the aqueous system containing the chlorides of potassium, ammonium, and calcium at 298.2, 323.2, and 348.2 K

Fuyu Zhuge; Nan Zhang; Haiying Tang; Qi Li; Niancu Chen; Xudong Yu

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Solid-liquid phase equilibria in the aqueous system containing the chlorides of potassium, ammonium, and calcium at 298.2, 323.2, and 348.2 K

Updated：2026-01-06

- Solid-liquid phase equilibria in the aqueous system containing the chlorides of potassium, ammonium, and calcium at 298.2, 323.2, and 348.2 K
- Solid-liquid phase equilibria in the aqueous system containing the chlorides of potassium, ammonium, and calcium at 298.2, 323.2, and 348.2 K
- 中国化学工程学报（英文版） 2024年76卷第12期页码：83-94
- Affiliations：
  
  1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology,Chengdu,China,610059
  2. Qinghai Salt Lake Industry Co., Ltd., Golmud,China,816000
- Author bio：
- Funds：
- DOI：
  中图分类号：
- 纸质出版：2024
- Accepted：
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Fuyu Zhuge, Nan Zhang, Haiying Tang, 等. Solid-liquid phase equilibria in the aqueous system containing the chlorides of potassium, ammonium, and calcium at 298.2, 323.2, and 348.2 K[J]. 中国化学工程学报（英文版）, 2024,76(12):83-94.

Fuyu Zhuge, Nan Zhang, Haiying Tang, Qi Li, Niancu Chen, Xudong Yu. Solid-liquid phase equilibria in the aqueous system containing the chlorides of potassium, ammonium, and calcium at 298.2, 323.2, and 348.2 K[J]. Chinese Journal of Chemical Engineering, 2024, 76(12): 83-94.
Fuyu Zhuge, Nan Zhang, Haiying Tang, 等. Solid-liquid phase equilibria in the aqueous system containing the chlorides of potassium, ammonium, and calcium at 298.2, 323.2, and 348.2 K[J]. 中国化学工程学报（英文版）, 2024,76(12):83-94. DOI：

Fuyu Zhuge, Nan Zhang, Haiying Tang, Qi Li, Niancu Chen, Xudong Yu. Solid-liquid phase equilibria in the aqueous system containing the chlorides of potassium, ammonium, and calcium at 298.2, 323.2, and 348.2 K[J]. Chinese Journal of Chemical Engineering, 2024, 76(12): 83-94. DOI：

摘要

Abstract

In order to obtain the crystalline forms of the salts of the potassium

ammonium

calcium coexisting chloride system

the phase equilibria relationship of quaternary system K

//Cl

-H

O at 298.2

323.2

and 348.2 K was studied by isothermal dissolution equilibrium method. The solubility and density of equilibrium liquid phases of the system were experimentally determined; X-ray powder diffractometer was used to determine the compositions of the equilibrium solid phase at the quaternary invariant point. It is found that the quaternary system is a complex system at these three temperatures. The phase diagram at 298.2 K consists of three invariant points

seven univariate curves and five crystalline phase regions

forming the solid solutions (NH

Cl)

(KCl)

and (KCl)

(NH

Cl)

; while at 323.2 and 348.2 K the phase diagram consists of five invariant points

eleven univariate curves and seven crystalline phase regions

the double salts (KCl·CaCl

) and (2NH

Cl·CaCl

·3H

solid solutions (KCl)

(NH

Cl)

and (NH

Cl)

(KCl)

were formed. Among them

the crystalline phase region of solid solution (KCl)

(NH

Cl)

is the largest at three temperatures

indicating that it is the easiest to crystallize in this system. Comparing the phase diagrams of the quaternary system at 298.2

323.2

and 348.2 K

it can be seen that the crystalline form of CaCl

changes with the increase of temperature: CaCl

·6H

O at 298.2 K

CaCl

·2H

O at 323.2 and 348.2 K. From 323.2 to 348.2 K

the crystalline phase regions of (KCl·CaCl

) and (2NH

Cl·CaCl

·3H

O) increased gradually.

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