Calcination Time Effects on Anatase White Pigment Production via Low Concentration Industrial Titanyl Sulfate Solution Hydrolyzing

Using low concentration industrial titanyl sulphate solution as raw material,anatase titania white pigment was prepared via the sulphate process of hydrolyzing,washing,salt treatment and calcination.And the effects of calcinations holding time at the highest temperature on structure and pigment properties were investigated.The as-prepared calcined samples were characterized by XRD,particle size distribution test,SEM and pigment properties test.Calcinations conditions had great influence on the crystal structure,grain size,particle size and its distribution,as well as pigment properties of the anatase white pigment.The average particle size of all the samples maintained about 300 nm,and crystal growth was consistent with first order kinetics of growth model.Keeping temperature at 930 ℃ for 30 min was the optimized calcination condition,and the prepared titanium white pigment was with regular morphology,the narrowest particle size distribution.The achromic ability index of the sample under optimized calcination condition was of 1 450,and relative whiteness index of 100.23%,higher than standard sample PTA120.