Thermochemical characterisation of the calcination process step in the sulphate method for production of titanium dioxide

Calcination is the last process step of the sulphate method for production of titanium dioxide. The chemical reactions that occur during calcination are analysed by means of simultaneous DTA-TG-MS-measurements in order to provide a 5-step reaction schematic. The corresponding enthalpies of reaction are determined calorimetrically by means of the reversed drop method. The developed schematic is suitable for process modelling purposes.

Research highlights▶ Calcination step of sulphate process for production of titanium dioxide considered. ▶ Calcination of samples monitored by simultaneous DTA-TG-MS-measurements. ▶ 5-step reaction schematic identified. ▶ Enthalpies of calcination reactions determined calorimetrically.