Structural Changes of Metatitanic Acid during Hydrolysis Process of Industrial Titanyl Sulfate Solution

Using low concentration industrial titanyl sulfate solution as raw material,metatitanic acid was prepared via the self seeded thermal hydrolysis sulfate process.The structural changes of metatitanic acid during hydrolysis of industrial titanyl sulfate solution were investigated.The as-prepared samples were characterized by particle size distribution test,XRD,BET and Raman.The results show that the D₅₀ and D_AV of the metatitanic acid particles were almost the same at the early stage of hydrolysis.The metatitanic acid particles became larger and distributed wider with the crystal growth and agglomeration,and.The TiO₂ structure of anatase phase in meta titanic acid was determined by the crystal nucleus,and subsequent hydrolysis has no obvious effect on the structure of anatase phase.The metatitanic acid was TiO₂ short chain structure with many mesopores and irregular pore structure.The cell parameter c increases with the increase of hydrolysis time,and the anatase TiO₂ structure had trend of distorted to the syncline square crystal.The intensity of Raman peak increases and the corresponding wavenumber of characteristic peak decreases,which results in the increase of the content of TiO₂ and the increase of the degree of crystallization.