Liquid-Solid Equilibrium of Na+, K+, Mg2+//Cl-, SO2-4, NO-3, H2O System at 25 ℃

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (6): 1378.

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Liquid-Solid Equilibrium of Na⁺, K⁺, Mg²⁺//Cl^-, SO^2-₄, NO^-₃, H₂O System at 25 ℃

HUANG Xue-Li*, WANG Xue-Feng, CHEN Li-Juan

College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China

Received:2010-07-05 Revised:2010-10-13 Online:2011-06-10 Published:2011-05-10
Contact: HUANG Xue-Li E-mail:xuelih@sohu.com
Supported by:
国家自然科学基金(批准号: 20466003, 20866008)和新疆大学博士启动基金项目资助.

Abstract

Abstract: In this work, the liquid-solid equilibrium for the Na+, K+, Mg2+//Cl-, SO42-, NO3-, H2O system，to which the nitrate brine in Xinjiang in China belongs, is investigated for the first time; The solubilities in phase equilibrium of this system have been measured by isothermal method, and according to experimental data, the phase diagram was plotted. The results show: when saturated with NaCl and at 25℃, in this system, there are 8 double salt, 15 regions saturated with two salts, and 25 invariant points, one of which is an incongruent point saturated with Mg(NO3)2?6H2O、NaCl、MgCl2?6H2O、MgSO4?(1～6)H2O、KCl?MgCl2?6H2O, and others are reaction points. Based on these works, the sequence of crystallization of salts from the brine during evaporation process was discussed.

Key words: Salt nitrate, Phase diagram, Six-component system, Xinjiang

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HUANG Xue-Li*, WANG Xue-Feng, CHEN Li-Juan. Liquid-Solid Equilibrium of Na⁺, K⁺, Mg²⁺//Cl^-, SO^2-₄, NO^-₃, H₂O System at 25 ℃[J]. Chem. J. Chinese Universities, 2011, 32(6): 1378.

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Liquid-Solid Equilibrium of Na⁺, K⁺, Mg²⁺//Cl^-, SO^2-₄, NO^-₃, H₂O System at 25 ℃

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