マット中のZnSの熱力学的研究 (第2報)

抄録

Thermodynamics of the copper mattes of FeS-ZnS and Cu₂S-ZnS-FeS systems were studied in the temperature range from 1, 200°C to 1, 250°V
The vapor pressures of ZnS at various compositions of these mattes were measured by the dew point method and from these experimental data thermodynamic functions were calculated.
In the FeS-ZnS system, activity curves of ZnS and FeS deviated positively from Raoult's law and the degree of deviation was represented by activity coefficient γ. The values of γ were 4-6 for ZnS and 1-1.05 for FeS. The points which ZnS in mattes precipitate, i. e. activity of ZnS eqval to unity, were about 0.23, 0.25 for molar fraction of ZnS at 1, 200°C, 1, 250°C respectively. Also by using these activity data, free energy, enthalpy and entropy of mixing were calculated.
From activity measurements of ZnS in the mattes of Cu₂S-ZnS-FeS system at 1, 200°C, iso-activity curve of ZnS and iso-free energy curve in the Cu₂S-ZnS-FeS system at 1, 200°C were obtained.