Solid–liquid phase equilibria in the quinary system Na+, K+, Mg2+//Cl-, NO3-–H2O and its subsystem at 258 K
Solid–liquid phase equilibria in the quinary system Na+, K+, Mg2+//Cl-, NO3-–H2O and its subsystem at 258 K
复制标题
DOI：
10.1007/s10953-020-00978-0
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
He Huang
中科院分区：
文献类型：
--
作者：
Xueying Wang;Xueli Huang;Xuefeng Wang;Zeyan Sun;Qinglong Luo;He Huang
The phase equilibrium of quaternary system Na＋, K＋, Mg2＋//Cl–H2O and quinary system Na＋, K＋, Mg2＋//Cl, NO3–H2O were investigated at 258 K using isothermal dissolution equilibrium method. The phase diagrams were obtained based on the measured data. Double salt KCl·MgCl2·6H2O was found in the quaternary and the quinary systems at 258 K. In the quaternary system Na＋, K＋, Mg2＋//Cl–H2O, there are two invariant points, five univariant curves, and four crystallization fields. The quinary system saturated with NaCl·2H2O contains four invariant points, nine univariant curves, and six crystallization fields corresponding to KCl, NaNO3, KNO3, Mg(NO3)2·6H2O, KCl·MgCl2·6H2O and MgCl2·8H2O. Mg(NO3)2·6H2O and MgCl2·8H2O have higher concentration and stronger salting-out effect on other salts. Therefore, the low-temperature pretreatment can offer an alternative way for the treatment of brines in accordance with the necessity for current brine treatment processes to reduce the presence of double salts and be crucial for more pure products to be separated.
