In this paper, correlated influence of the phase equilibrium of NaOH-Na 2SO 4-H 2O system and the exchanging equilibrium of R 2SO 4-NaOH-H 2O system and reasing effect of processed NaOH solution are analysed and examined.

The thermodynamic and equilibrium constant criterion of the silver leaching with cyanide is deduced.

The thermodynamic criterion of the gold leaching with thiosulfate is deduced, and the equilibrium criterion of the leaching process is proposed, and the thermodynamic criterion and relative parameters of gold leaching with cyanide and thiosulfate are analyzed and compared.

The dependence of reaction heats and equilibrium constants of each reaction in the system on temperature were obtained.

In this paper,we report calculated intrinsic equilibrium constants for several surface complexation reactions,which are computed by using three frequently used surface complexation models and experimental data from Arsenic adsorption on amorphous aluminum oxides at different solution ionic strength and pH.

Thermodynamic equilibrium constants of chemical reactions, which involve gaseous phases, condensed phases and complex phases, are strictly deduced in terms of chemical potential.