Studies on the Metastable Phase Equilibrium of Na+, K+, Mg2+ ∥Cl-, SO4 2--H2O Quinary System at35 ℃

Abstract

Abstract: This paper presents the experimental data of metastable phase equilibrium of Na⁺, K⁺, Mg ²⁺ ∥Cl^-, SO₄^2- H₂Oquinary system at 35 ℃, from which the metastable phase diagram is drawn. It consists of nine regions of crystallization saturated with sodium chloride, potassium chloride, glasserite(3K₂SO₄·Na₂SO₄), leonite(K₂SO₄·MgSO₄·4H₂O), kainite(KCl·MgSO₄·2.75H₂O), thenardite(Na₂SO₄), astrankit(MgSO₄·Na₂SO₄·4H₂O), carnallite(KCl· MgCl₂·6H₂O), magnesium sulfate hexahydrite(MgSO₄·6H₂O) and bischofit(MgCl₂·6H₂O). Alarge difference is found between the obtained metastable phase diagram at 35 ℃ and Van't Hoff's stable phase diagram at 25 ℃. The crystallization regions of schoenite(K₂SO₄·MgSO₄·6H₂O), epsomite(MgSO₄·7H₂O), magnesium sulfate pentahydrite(MgSO₄·5H₂O) and starkeyite(MgSO₄·4H₂O) disappear and the crystallization regions of leonit and astrankit are greatly incresed. Also there is much difference between the obtained metastable phase diagram at 35 ℃ and the metastable phase diagram at 25 ℃. The crystallization regions of schoenite(K₂SO₄·MgSO₄·6H₂O) and epsomite disappear and arise the crystallization regions of leonite and kainite. It is found that the crystallization region of low hydrate kainite(KCl·MgSO₄·2.75H₂O) exists in the metastable phase equilibrium of Na⁺, K⁺, Mg ²⁺ ∥Cl^-, SO₄^2- H₂Oquinary system at 35 ℃.

Key words: Phase equilibrium, Metastable phase equilibrium, Sea-water type quinary system, Sulfate type potassium salt

CLC Number:

O642.5

TrendMD:

JIN Zuo-Mei, ZHOU Hui-Nan, WANG Li-Sheng . Studies on the Metastable Phase Equilibrium of Na⁺, K⁺, Mg^²⁺ ∥Cl^-, SO₄^2--H₂O Quinary System at₃₅ ℃[J]. Chem. J. Chinese Universities, 2001, 22(4): 634.

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Studies on the Metastable Phase Equilibrium of Na⁺, K⁺, Mg^²⁺ ∥Cl^-, SO₄^2--H₂O Quinary System at₃₅ ℃

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