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The phase diagrams and Pitzer model representations for the system KCl + MgCl2 + H2O at 50 and 75°C

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Abstract

The solubilities in the KCl-MgCl2-H2O system were determined at 50 and 75°C and the phase diagrams and the diagram of refractive index vs composition were plotted. Two invariant point, three univariant curves, and three crystallization zones, corresponding to potassium chloride, hexahydrate (MgCl2 · 6H2O) and double salt (KCl · MgCl2 · 6H2O) showed up in the phase diagrams of the ternary system, The mixing parameters θK, Ca and ΨK, Ca, Cl and equilibrium constant K sp were evaluated in KCl-MgCl2-H2O system by least-squares optimization procedure, in which the single-salt Pitzer parameters of KCl and MgCl2 β(0), β(1), β(2), and C ϕ were directly calculated from the literature. The results obtained were in good agreement with the experimental data.

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Authors and Affiliations

  1. School of Chemistry & Resources and Environment, Linyi University, Linyi, 276005, China

    Ji-min Yang, Jing Peng, Yu-xia Duan & Chong Tian

  2. Key Laboratory of Resources and Environment in Analytical Chemistry of Shandong Province, Linyi, 276005, China

    Ji-min Yang

  3. Experimental Centre, Linyi University, Linyi, 276005, China

    Mei Ping

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  1. Ji-min Yang
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  2. Jing Peng
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  3. Yu-xia Duan
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  4. Chong Tian
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  5. Mei Ping
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Correspondence to Ji-min Yang.

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Yang, Jm., Peng, J., Duan, Yx. et al. The phase diagrams and Pitzer model representations for the system KCl + MgCl2 + H2O at 50 and 75°C. Russ. J. Phys. Chem. 86, 1930–1935 (2012). https://doi.org/10.1134/S0036024412130146

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  • DOI: https://doi.org/10.1134/S0036024412130146

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