Effect of Feed Rate on the Hydrolysis of Titanyl Sulfate Solutions with Low Titanium Concentration

The hydrolysis of titanyl sulfate solutions was investigated,mainly focusing on the influence of feed speed of titanium solution on hydrolysis rate,gray-turning point of solution,size of primary and secondary particles for hydrolysis.The results show that with decrease in feed rate the hydrolysis rate of titanium solution increases,since the dilution extent of initial titanyl sulfate solution is enhanced with longer duration by slow feed speed which results in more formed seed crystals.The gray-turning time for the solution is shortened with decrease of feed speed.The size of primary hydrolysis particles is affected by feed rate that a slower feed speed contributes to the formation of fine-uniform primary particles.The average particle size of hydrolysate from low-concentration of titanium solution is 1.69~1.78 μm.With decrease in feed speed,the size distribution of obtained hydrolysate becomes narrow,and the morphology of the hydrolysate gradually transforms from irregular-dense to spherical-loose particles.This research could provide guidance to further improvement for the production process of titanium solution hydrolysis.