Materials Transactions Online

Materials Transactions, Vol.44 No.6 (2003) pp.1116-1119
© 2003 The Mining and Materials Processing Institute of Japan

Vapor Pressure Measurements for the FeCl2-ZnCl2 System by the Transpiration Method

Sang Han Son1,* and Fumitaka Tsukihashi2

1Department of Materials Science and Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
2Department of Advanced Materials Science, Graduate School of Frontier Science, The University of Tokyo, Kashiwa 277-8561, Japan

The vapor pressures of FeCl2 and ZnCl2 in the FeCl2-ZnCl2 system were measured by the transpiration method at 873 K and 917 K. The vapor pressure data were interpreted to indicate the formation of complex ions in the FeCl2-ZnCl2 melts. It is presumed that the complex molecule FeZnCl4 as well as FeCl2 and ZnCl2 exists in the vapors in equilibrium with molten FeCl2-ZnCl2 mixtures. The activities in the FeCl2-ZnCl2 system show a negative deviation from Raoult's law. These results suggest that the complex ions such as ZnCl42- are formed in molten FeCl2-ZnCl2 mixtures.

(Received November 18, 2002; Accepted March 12, 2003)

Keywords: thermodynamics, vapor pressure, dust, fly ash, transpiration method, iron chloride-zinc chloride system

*Graduate Student, The University of Tokyo.

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