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Stable Phase Diagram of the Quaternary Water–Salt System Li+, Na+, Mg2+//SO42––H2O at T = 323 K
Journal of Chemical & Engineering Data ( IF 2.298 ) Pub Date : 2019-12-16 , DOI: 10.1021/acs.jced.9b00813
Wenzhang Zuo; Ying Zeng; Xudong Yu; Wannian Ying; Hanlin Tong; Jingfeng Liu; Pan Xu

The stable equilibrium solubility, density, and refractive index of the quaternary system Li+, Na+, Mg2+//SO42––H2O were studied at T = 323 K by the isothermal dissolution method. The results show that at T = 323 K, a sodium–magnesium sulfate mineral astrakhanite (Na2SO4·MgSO4·4H2O) and a lithium–sodium sulfate double salt (Li2SO4·Na2SO4) are formed in this quaternary system 323 K, but no double salt or solid solution formed between lithium sulfate and magnesium sulfate. The phase diagram consists of seven isothermal dissolution curves, five regions of crystallization, and three invariant points, among which one belongs to an commensurate point (H3) and two belong to incommensurate points (H1 and H2). Its five crystallization fields correspond to single salts Li2SO4·H2O, Na2SO4, hexahydrite (MgSO4·6H2O), and two double salts astrakhanite (Na2SO4·MgSO4·4H2O) and Li2SO4·Na2SO4. Hexahydrite (MgSO4·6H2O) has the smallest crystal phase region, while lithium sulfate monohydrate (Li2SO4·H2O) has the largest crystal region. At equilibrium, the refractive index and density in the solution change regularly with the change in concentration of sodium sulfate. Comparisons of the phase diagrams of Li+, Na+, Mg2+//SO42––H2O at different temperatures show that the temperature is the main factor for the salt crystals, not only the crystallization form but also the crystal water content.
更新日期:2019-12-17

 

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