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Thermodynamic equilibrium diagram of CaCl2-Ca(OH)2-H2O system

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Abstract

The lg c-pH diagram of the CaCl2-Ca(OH)2-H2O system and its two subsystems at 298.15 K are constructed according to the theory of thermodynamic equilibrium. The interaction characteristics between the solubility of CaCl2 and Ca(OH)2 can be found out from the diagrams. CaCl2·6H2O (s), Ca(OH)2(s) and solution coexist when the pH value of solution is about 10.8. CaCl2 with the minimum solubility of 1 682.4 g/L is in equilibrium with solution when the pH value is lower than 9.4, and Ca(OH)2 with the minimum solubility of 2.749 g/L is in equilibrium with solution at the pH value over 12.1, which provides a theoretical basis for the treatment and reuse of calcium chloride mother liquor for collocating lime cream which is the precipitant in the process of synthesizing magnesium hydroxide.

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Authors and Affiliations

  1. School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China

    Wei-ping Liu  (刘卫平), Hui Xu  (徐徽), Xi-yun Yang  (杨喜云), Xi-chang Shi  (石西昌) & Ya Chen  (陈亚)

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  1. Wei-ping Liu  (刘卫平)
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  2. Hui Xu  (徐徽)
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  3. Xi-yun Yang  (杨喜云)
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  4. Xi-chang Shi  (石西昌)
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  5. Ya Chen  (陈亚)
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Corresponding author

Correspondence to Hui Xu  (徐徽).

Additional information

Foundation item: Project(2008BAB35B04) supported by National High Technology Research and Development Program of China; Project(2010QZZD003) supported by Advanced Research Program of Central South University, China

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Liu, Wp., Xu, H., Yang, Xy. et al. Thermodynamic equilibrium diagram of CaCl2-Ca(OH)2-H2O system. J. Cent. South Univ. 19, 2751–2754 (2012). https://doi.org/10.1007/s11771-012-1337-2

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  • DOI: https://doi.org/10.1007/s11771-012-1337-2

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