Vapor Pressure Measurements for the FeCl<SUB>2</SUB>-ZnCl<SUB>2</SUB> System by the Transpiration Method

Abstract

The vapor pressures of FeCl 2 and ZnCl 2 in the FeCl 2 -ZnCl 2 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 FeCl 2 -ZnCl 2 melts. It is presumed that the complex molecule FeZnCl 4 as well as FeCl 2 and ZnCl 2 exists in the vapors in equilibrium with molten FeCl 2 -ZnCl 2 mixtures. The activities in the FeCl 2 -ZnCl 2 system show a negative deviation from Raoult's law. These results suggest that the complex ions such as ZnCl

Activity Measurement for the FeCl2-ZnCl2 System

“…The integral results of Figure 6 and the obtained activities are summarized in Table III. D. Activities of FeCl 2 and ZnCl 2 for the FeCl 2 -ZnCl 2 System Figure 7 shows the activities of FeCl 2 and ZnCl 2 calculated from the integral of Figure 6 in the FeCl 2 -ZnCl 2 system with previously reported data. [17] The vertical line in Figure 7 represents the saturation composition of FeCl 2 at 917 K from the phase diagram. [21] The activities in the system show a negative deviation from Raoult's law and are in good agreement with the previously reported values.…”

“…[17] The vapor pressure of FeCl 2 in the system obtained using the transported weight loss of FeCl 2 was shown to be much higher than that of pure FeCl 2 . These results implied the formation of vapor complexes in the system, and the vapor pressures of FeCl 2 and ZnCl 2 in the system were obtained on the basis of the formation of FeZnCl 4 complex species in vapors.…”

Kinetics of Zn Removal from ZnO–Fe2O3–CaCl2 System

“…Various new selective chlorination and evaporation processes have been proposed. [8][9][10][11][12][13][14][15][16][17][18][19] The Cl 2 gas was used as the chlorination resource in these investigations. However, CaCl 2 is a more selective chlorinating agent for volatilizing Zn, Pb and so on.…”