THERMODYNAMIC EQUILIBRIUM OF Sb-Cl-H2O SYSTEM
(Institute of Metallurgy Physical Chemistry; Central South University of Technology; Changsha 410083)
Abstract: According to the law of conservation of mass and the law of simultaneous equilibrium, logarithm concentration pH(lgCpH) diagrams of Sb(Ⅲ) Cl H2O system have been made for the first time. The effect of Sb and Cl on stabilization zone of each solid phase was studied and discussed. The results show that the pH of complete hydrolysis and complete dechloride are decreasing with the toal concentration of Cl in the system C0Cl and the toal concentration of Sb in the system C0Sb decrease, C0Cl and C0Sb has little effect on Sb2O3 solution equilibrium, but they have prominent effect on the equilibrium of SbOCl solution and Sb5O4Cl2 solution. Using the figures we can choose some technology parameters of hydrolyzing and eliminate chloride process in theory. The pH of hydrolysis completely is approximately 0.5 and the pH of dechloride completely is above 7.
Key words: antimony chloride thermodynamic equilibrium logarithm concentration pH diagrams