Effects of Hydrolysis Conditions on High Purity TiO₂ Preparation from Industrial Low Concentration Titanyl Sulfate Solution

High purity TiO₂ was prepared via authigenic seed thermal hydrolysis route by using industrial low concentration titanyl sulfate solution as titanium source.The as-prepared metatitanic acid and TiO₂ powders were characterized by XRD,particle size distribution,BET analysis and TiO₂ content determination.The hydrolysis conditions had important influences on the hydrolysis process of low concentration titanyl sulfate solution.The appropriate amount of induced water 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 of the hydrated titanium dioxide,which could obtain metatitanic acid with smaller average particle size and specific surface area.These effects were beneficial to reduce the adsorption of impurities and produce TiO₂ with high purity.And the hydrolysis conditions had internal influencing relationship between them.The optimized hydrolysis conditions were the induced water volume ratio of 60% and the hydrolysis time of 120 min,and the high purity TiO₂ over 99.97% content could be obtained.