Leaching Thermodynamics and Kinetics of Preparation of Synthetic Rutile

Leaching thermodynamics and kinetics of preparation of synthetic rutile were discussed. Leaching Gibbs free energy change of reactions were calculated. The metal and water E-pH formula were obtained at different temperatures. Potential-pH formulas of reactions and PotentialpH diagram of MeO-H2O systems were drawn at the temperature of 298K and 313K when the ionic activity is 1.0. Kinetic experiments and calculations show that the leaching process can be modeled with the shrinking core model which indicates that the control factor of the leaching process is chemistry reactions. The apparent activation energy of alkali leaching process is 43.52kJ/mol.