A novel preparation of high purity TiO2 from industrial low concentration TiOSO4 solution via short sulfate process

High purity TiO2 was prepared by authigenic seed thermal hydrolysis route from industrial low concentration titanyl sulfate solution via the short sulfate process. The hydrolysis conditions had important influences on the hydrolysis process. The appropriate induced water volume ratio and hydrolysis time were conducive to form appropriate quantity and quality of hydrolysis seeds, adjust and control the precipitation, crystal growth, particle growth and aggregation velocity for the hydrated TiO2, which could obtain the hydrated TiO2 with smaller average particle size and specific surface area. These effects were beneficial to reduce the adsorption of impurities, and improve the purity of TiO2. The hydrolysis conditions had internal influencing relationship between them. The optimized hydrolysis conditions were the induced water volume ratio was of 60%, the hydrolysis time was of 120 min, and the high purity, monodisperse titanium dioxide over 99.98% content could be obtained.

Automated summary

The induced water volume ratio and hydrolysis time have significant impacts on the purity and particle characteristics of TiO2. By optimizing these two factors, high purity and monodisperse titanium dioxide can be obtained.