Phase equilibria of the Na+, Mg2+//Cl–, SO42–-H2O system

被引：0

作者：

Gong X.-M. ^{[1
,2
]}

Wang L. ^{[1
]}

Wang B.-J. ^{[2
]}

Cao J.-L. ^{[3
]}

Yang J.-Y. ^{[1
]}

机构：

[1] College of Chemical Engineering, North China University of Science and Technology, Tangshan

[2] Tangshan Sanyou Chemical Industry Co. Ltd., Tangshan

[3] Hebei Provincial Key Lab of Green Chemical Technology and High Efficient Energy Saving, College of Chemical Engineering, Hebei University of Technology, Tianjin

来源：

Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2022年 / 36卷 / 04期

关键词：

alkali production; concentrated seawater; crystallization; Na[!sub]2[!/sub]SO[!sub]4[!/sub] hydrate; phase equilibria;

D O I：

10.3969/j.issn.1003-9015.2022.04.003

中图分类号：

学科分类号：

摘要：

A Na2SO4 hydrate method was proposed to enrich seawater from concentrated seawater after desalination. Phase equilibria of the quaternary system Na+, Mg2+//Cl–, SO42–-H2O and its sub-systems at 5 ℃ were measured by isothermal methods and the phase diagrams were investigated. The results show that there are two isothermal co-satiation points and four crystalline fields in the quaternary system. The crystallization area of Na2SO4·10H2O was large, which indicates that it can be used to study seawater enrichment using Na2SO4 hydrate methods. The phase diagram calculations show that the concentrating rate of desalinated seawater is 82.78% and Na2SO4 recycle rate is 99.6%. The product can be used as raw material in alkali production to reduce the desalting process after refining. The process is helpful for comprehensive utilization of concentrated seawater after desalination. © 2022 Zhejiang University. All rights reserved.

引用

页码：481 / 487

页数：6

共 31 条

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