Vapor pressure measurements for metal chloride systems by the Knudsen effusion method

Yanling Zhang, Etsuro Shibata, Eiki Kasai, Takashi Nakamura

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Thermodynamic knowledge of metal chlorides, such as vapor pressure and activity in salt/slag, are of remarkable industrial interest, particularly in fields related to the recovery/recycle/reuse of metal materials. In this study, a new apparatus for measuring the vapor pressure of metal chlorides from molten salt/slag was designed and tested with reference compounds. The results are in a good agreement with the available literature data. Using the developed apparatus, vapor pressure measurements for a KCl-NaCl-CaCl2 system have been performed. Using the measured data the activities of components were obtained. Simultaneously, the activities of components were calculated using a thermodynamic code, Factsage 5.2 wherein the Modified Quasi-chemical Model was employed to obtain the necessary thermodynamic parameters. The both data agree reasonably well with each other. The results suggested that the KCl-NaCl system exhibits similar behavior with ideal solution; while in the KCl-CaCl 2 and NaCl-CaCl2 systems there are possible interactions between CaCl2 and KCl/NaCl. For the ternary system KCl-NaCl-CaCl 2, in some concentration range (mole fraction of NaCl 0.25-0.50) NaCl behaves as in an ideal solution, suggesting a larger affinity between KCl and CaCl2 than that between NaCl and CaCl2.

Original languageEnglish
Pages (from-to)1348-1353
Number of pages6
JournalMaterials Transactions
Issue number6
Publication statusPublished - 2005 Jun


  • Knudsen effusion method
  • Metal chlorides
  • Modified Quasi-chemical Model
  • Vapor pressure measurement


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