Regression Relations of Hydrolysis Parameters for Rutile Titanium White Preparation via Short Sulfate Process

The rutile TiO₂ white pigment was prepared via short sulfate process of diluted thermal hydrolysis with self-generating crystal seeds using unenriched low concentration of industrial titanyl sulfate solution as titanium source. The regression relations and influences of the hydrolysis parameters,including preadding water volume ratio,aging and hydrolysis time on the structure,particle size distribution and pigment properties of metatitanic acid and rutile TiO₂ white pigment were investigated. The hydrolysis parameters significantly influence the number and quality of the initial formed nuclei,the crystal growth and aggregation,and eventually determine the pigment properties of the products. There exist mathematical correlations between the hydrolysis parameters and products crystal structure,particle polydispersity index,and pigment properties. The optimal hydrolysis parameters are 0.123 of the pre-adding water volume ratio,29.05 min of the aging time and about 2.6 h of hydrolysis time after the second boiling.