Studies on the Metastable Phase Equilibrium of Na+, K+,Mg+ //Cl-, SO42--H2O Quinary System at 15℃

Abstract

Abstract: This paper presents the experimental date of metastable phase equilibrium of Na⁺, K⁺,Mg⁺ //Cl^-, SO₄^2--H₂O quinary system at 15 ℃, from which the metastable phase diagram is drawn.lt con-sists of nine rigions of crystallization saturated with sodium chloride: potassium chloride, thenardite(Na₂SO₄), glasserite(3K₂SO₄·Na₂SO₄), schoenit(K₂SO₄·MgSO₄·6H₂O), astrankit(MgSO₄·Na₂SO₄·4H₂O), carnallite (KCl· MgCl₂· 6H₂O), epsomite (MgSO₄·7H₂O), hexahydrite (MgSO₄·6H₂O)and bischofit(MgCl₂·6H₂O).Alarge difference is found between the obtained metastable phase diagramat 15℃ and Van't Hoff's stable phase diagram at 25℃.The crystallization of leonite(K₂SO₄·MgSO₄·4H₂O), kainite(KCl·MgSO₄·3H₂O), magnesium sulfate quinhydrate(MgSO₄·5H₂O) and starkeyite(MgSO₄·4H₂O) disapear and the crystallization regions of schoenit greatly increased.Comparing themetastable phase diagram of Na⁺, K⁺, Mg²⁺ //Cl^-, SO₄^2- at 15 ℃ with the metastable phase dia-gram at 25℃ and 35℃ by the authors, it is found the crystallization region of schonite (includingleonite) at 25℃ is the largest, and at 35℃ is the smallest with the temperature rising from 15℃ to 35℃, the crystallization regions of glasserite parallelly moved toward KCl region, which made the KCl regiondecreasing and the Na₂SO₄ region increasing; with the temperature rising from 15℃, 25℃ to 35℃, thesodium containing and water containing decrease consequently.

Key words: Phase equilibrium, Metastable phase equilibrium, Sea-water type quinary system, Potassium sulfate

CLC Number:

O642.5

TrendMD:

JIN Zuo-Mei, ZHOU Hui-Nan, WANG Li-Sheng. Studies on the Metastable Phase Equilibrium of Na⁺, K⁺,Mg⁺ //Cl^-, SO₄^2--H₂O Quinary System at 15℃[J]. Chem. J. Chinese Universities, 2002, 23(4): 690.

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Studies on the Metastable Phase Equilibrium of Na⁺, K⁺,Mg⁺ //Cl^-, SO₄^2--H₂O Quinary System at 15℃

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