Liquid-solid phase equilibrium of Na+, K+, Mg2+// Cl-, SO4-2-H2O?system at -15℃

doi:10.11949/j.issn.0438-1157.20141384

Abstract

Abstract:

Solubilities and densities in the system Na⁺, K⁺, Mg²⁺// Cl^-, SO₄^-2-H₂O saturated with NaCl·2H₂O were investigated with the isothermal method at -15℃. Based on experimental data, phase diagram and density- composition diagram were drawn. The equilibrium phase diagram of quinary system consisted of three invariant points, seven univariant curves and five crystallization fields, corresponding to solids of KCl+NaCl·2H₂O, Na₂SO₄·10H₂O+NaCl·2H₂O, MgSO₄·7H₂O+NaCl·2H₂O, MgCl₂·8H₂O+NaCl·2H₂O and KCl·MgCl₂·6H₂O+ NaCl·2H₂O. Compared with the phase diagram at 25℃, in the phase diagram at -15℃, the crystalline regions of K₂SO₄·MgSO₄·4H₂O, KCl·MgSO₄·3H₂O, Na₂SO₄·3K₂SO₄, Na₂SO₄·MgSO₄·4H₂O, MgSO₄·(4-6)H₂O, K₂SO₄·MgSO₄·6H₂O did not exist, the crystalline region of Na₂SO₄converted into the crystallization field of Na₂SO₄·10H₂O and became larger, the crystallization fields of KCl, MgSO₄·7H₂O, KCl·MgCl₂·6H₂O decreased and the crystalline region of MgCl₂·6H₂O converted into the crystallization field of MgCl₂·8H₂O. The crystallization behavior of brines with different concentrations in the cooling process was studied. Such information could provide theoretical guidance for comprehensive utilization of salt-lake resource.

Key words: quinary system, low temperature, phase diagram

摘要：

采用等温溶解平衡法,研究了Na⁺, K⁺, Mg²⁺//Cl^-, SO₄^-2-H₂O, 五元水盐体系在-15℃下NaCl·2H₂O饱和时的相平衡关系,测定了溶解度和密度,并绘制出相应的相图。研究结果表明:该五元体系平衡相图中有3个四盐共饱点,7条单变量溶解度曲线及5个两盐结晶区,5个两盐结晶区分别对应于KCl+NaCl·2H₂O、Na₂SO₄·10H₂O+ NaCl·2H₂O、MgSO₄·7H₂O+NaCl·2H₂O、MgCl₂·8H₂O+NaCl·2H₂O、KCl·MgCl₂·6H₂O+ NaCl·2H₂O;所得-15℃相图和25℃下相图相比,相图结构大为简化:K₂SO₄·MgSO₄·4H₂O、KCl·MgSO₄·3H₂O、Na₂SO₄·3K₂SO₄、Na₂SO₄·MgSO₄·4H₂O、MgSO₄·(4～6)H₂O、K₂SO₄·MgSO₄·6H₂O结晶区均消失,Na₂SO₄结晶区转变为Na₂SO₄·10H₂O且结晶区扩大,KCl、MgSO₄·7H₂O、KCl·MgCl₂·6H₂O结晶区缩小,MgCl₂·6H₂O结晶区转变为MgCl₂·8H₂O。在此基础上研究了不同组成的盐湖卤水在降温过程中的结晶规律,为低温盐田工艺的开发提供了理论依据。

关键词: 五元体系, 低温, 相图

CLC Number:

O642.5⁺4

ZHU Qiaoli, HUANG Xueli. Liquid-solid phase equilibrium of Na⁺, K⁺, Mg²⁺// Cl^-, SO₄^-2-H₂O?system at -15℃[J]. CIESC Journal, 2015, 66(4): 1252-1257.

朱巧丽, 黄雪莉. -15℃下Na⁺, K⁺, Mg²⁺// Cl^-, SO₄^-2-H₂O体系相平衡[J]. 化工学报, 2015, 66(4): 1252-1257.

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Liquid-solid phase equilibrium of Na⁺, K⁺, Mg²⁺// Cl^-, SO₄^-2-H₂O?system at -15℃

-15℃下Na⁺, K⁺, Mg²⁺// Cl^-, SO₄^-2-H₂O体系相平衡

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