Vapor pressure of zinc and zinc chloride in the FetO-CaO- SiO2-Al2O3 slag system

Yanling Zhang, Etsuro Shibata, Eiki Kasai, Takashi Nakamura

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7 Citations (Scopus)


Vapor pressure of zinc from the FetO-CaO-SiO2-Al 2O3 slag system was measured by the Knudsen effusion method under conditions with varying parameters such as temperature, slag compositions, and initial contents of zinc and chlorine. In the thermodynamic estimations using thermodynamic parameters under the experimental temperature range, for slag samples without Cl addition, it suggests that metallic Zn is the only vapor species. In the case of Cl addition, gaseous ZnCl2 is predominant and the formation ratio of metallic Zn and FeCl2 can be neglected. In the measurements, the vapor pressures of metallic Zn and ZnCl 2 increase with increasing temperature. For ZnCl2, the logarithm of vapor pressure (In P) is a linear function of the reciprocal of temperature (1/T), while in the case of gaseous metallic Zn, a non-linear relationship is observed between In P and 1 /T, The slag basicity exhibits the different effects on the vapor pressures of metallic Zn and ZnCl2. The former increases with increasing the slag basicity, while the latter decreases. A high FeO content in the slag tends to increase the vapor pressure of metallic Zn and ZnCl2.

Original languageEnglish
Pages (from-to)1341-1346
Number of pages6
JournalMaterials Transactions
Issue number5
Publication statusPublished - 2006 May


  • Heavy metals
  • Knudsen effusion method
  • Smelting process
  • Vapor pressure measurement


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