Calculation of the solubility of TiO2 and titanates in sulfuric acid solutions

The Gibbs energies of formation of Ti(IV) hydrolysis forms have been obtained, and they can be used to calculate the TiO2 solubility as a function of the hydrogen ion concentration (pH). The dependence of the change of the Gibbs energy during dissolution of various ilmenites on mole fraction of TiO2 in compounds is established. A method to increase the rate of dissolution of low soluble titanates by their conversion into compounds with a higher solubility is proposed.