Phase equilibria of quaternary system CaCl2-CaSO4-CaB6O10-H2O at 308.15 K

YUAN Fei; SONG Jiangtao; HU Jiayin; GUO Yafei; WANG Shiqiang; DENG Tianlong

doi:10.11949/0438-1157.20191148

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Phase equilibria of quaternary system CaCl₂-CaSO₄-CaB₆O₁₀-H₂O at 308.15 K

Thermodynamics | 更新时间：2026-07-24

- Phase equilibria of quaternary system CaCl₂-CaSO₄-CaB₆O₁₀-H₂O at 308.15 K
- CIESC Journal Vol. 71, Issue 1, Pages: 209-215(2020)
- 作者机构：
  
  天津科技大学化工与材料学院，天津 300457
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20191148
  CLC： O 642.4
- Received：09 October 2019，
  
  Revised：2019-11-09，
  
  Online First：12 August 2020，
  
  Published：05 January 2020
- 稿件说明：
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袁菲, 宋江涛, 胡佳音, 郭亚飞, 王士强, 邓天龙. 四元体系CaCl₂-CaSO₄-CaB₆O₁₀-H₂O 308.15 K相平衡研究[J]. 化工学报, 2020, 71(1): 209-215 DOI: 10.11949/0438-1157.20191148.

YUAN Fei, SONG Jiangtao, HU Jiayin, GUO Yafei, WANG Shiqiang, DENG Tianlong. Phase equilibria of quaternary system CaCl₂-CaSO₄-CaB₆O₁₀-H₂O at 308.15 K[J]. CIESC Journal, 2020, 71(1): 209-215 DOI: 10.11949/0438-1157.20191148.
袁菲, 宋江涛, 胡佳音, 郭亚飞, 王士强, 邓天龙. 四元体系CaCl₂-CaSO₄-CaB₆O₁₀-H₂O 308.15 K相平衡研究[J]. 化工学报, 2020, 71(1): 209-215 DOI: 10.11949/0438-1157.20191148. DOI：

YUAN Fei, SONG Jiangtao, HU Jiayin, GUO Yafei, WANG Shiqiang, DENG Tianlong. Phase equilibria of quaternary system CaCl₂-CaSO₄-CaB₆O₁₀-H₂O at 308.15 K[J]. CIESC Journal, 2020, 71(1): 209-215 DOI: 10.11949/0438-1157.20191148. DOI：

摘要

采用等温溶解平衡法研究了四元体系CaCl

-CaSO

-CaB

-H

O在308.15 K下的稳定相平衡。测定了该体系的溶解度及平衡溶液的物化性质(包括折射率、密度和pH)。根据实验数据，分别绘制了该四元体系的干基图、水图以及相应的物化性质–组成图。研究结果表明：该体系在308.15 K时有1个共饱点(CaCl

·4H

O + CaSO

·2H

O + CaB

·5H

O)，3条单变量溶解度曲线，3个单盐结晶区

分别对应于CaCl

·4H

O、硬石膏(CaSO

·2H

O)和高硼钙石(CaB

·5H

O)。其中，硬石膏CaSO

·2H

O结晶区最大、高硼钙石CaB

·5H

O结晶区次之，而CaCl

·4H

O结晶区最小，表明硬石膏最易于结晶析出。此外，该四元体系在308.15 K下没有复盐和固溶体生成，属于简单水合物I型。平衡液相的物化性质随着CaCl

浓度的增大呈规律性变化，并在共饱点处发生转折。其中，折射率和密度的变化规律相近，而pH的变化规律则与之相反。对该四元体系的稳定相平衡进行研究，将为综合开发利用油田卤水中的钙、硼等资源提供理论依据。

Abstract

In this work

an isothermal dissolution method was used to study the phase equilibria for the quaternary system (CaCl

-CaSO

-CaB

-H

O) at 308.15 K. The solubilities

densities

refractive indices and pH were investigated experimentally. According to the experimental data

the phase diagram

water-phase diagram and the diagrams on physicochemical properties including density

refractive index and pH against composition were plotted. The phase diagrams for the quaternary system at 308.15 K include one invariant point

three univariate solubility curves and three crystalline regions corresponding to CaCl

·4H

gypsum (CaSO

·2H

O) and gowerite (CaB

·5H

O). The crystallizing area of gypsum (CaSO

·2H

O) is the largest

the gowerite (CaB

·5H

O) is the second

and the CaCl

·4H

O is the smallest

indicating that the gypsum is most easily crystallized. In addition

the quaternary system was of the hydrate type I

neither double salt nor solid solution were formed. The physicochemical properties change regularly with the increasing of CaCl

concentration and appeared a turning point at invariant point. The distributive behaviors of density and refractive index against the concentration of calcium chloride in the equilibrium solution are similar. On the contrary

the change law of pH is opposite. The phase equilibrium study of quaternary system (CaCl

-CaSO

-CaB

-H

O) will provide a theoretical basis for the development and utilization of calcium and boron resources in oilfield brines.

关键词

Keywords

references

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