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2009, Volume 3, Issue 2

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Frontiers of Chemical Science and Engineering >> 2009, Volume 3, Issue 2 doi: 10.1007/s11705-009-0048-1

Simulation studies on metastable phase equilibria in the aqueous ternary systems (NaCl-MgCl

1. Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China; 2. College of Materials, Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China

Available online: 2009-06-05
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Abstract

The solubilities and densities of the aqueous metastable ternary systems (NaCl-MgCl -H O) and (KCl-MgCl -H O) at 308.15 K were determined by the isothermal evaporation method. On the basis of the experimental results, the phase diagrams for those systems were plotted. It was found that the former system belongs to the hydrate-I type with one invariant point of (NaCl+ MgCl ?6H O), two univariant curves, and two crystallization regions corresponding to halite (NaCl) and bischofite (MgCl ·6H O); and the latter system belongs to the type of incongruent-double salts with two invariant points of (KCl+ KCl·MgCl ·6H O) and (MgCl ·6H O+ KCl·MgCl ·6H O), three univariant curves, and three crystallization regions corresponding to potassium chloride (KCl), carnallite (KCl·MgCl ·6H O) and bischofite (MgCl ·6H O). No solid solutions were found in both systems.

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