China Nonferrous Metallurgy

In this paper, the decomposition and volatilization of Sn, SnS, Cu, Cu₂S and their mutual reaction ΔG-T under different conditions are calculatedby using tclassical thermodynamic calculation method, as well as the stats such as saturated vapor pressure of tin. The theoretical experimental conditions of decomposition, volatilization and mutual reaction of Sn, SnS, Cu and Cu₂S are studied through data analysis and discussion as following: the decomposition temperature and pressure of SnS(s, l) are negatively correlated, and the decomposition reaction of SnS(s, l)does not occur in the standard conditions, and the decomposition reaction of SnS(g) is impossible; the decomposition temperature of Cu₂S s, l) is negatively correlated with the pressure; In standard conditions, when the temperature is higher than 690K (about 417℃), SnS reacts with Cu; In vacuum, Cu₂Sand Sn react easily.