Influence of Post-processing on Brightness of Titanium Dioxide

In order to solve the problem of low brightness and brightness fluctuation for titanium dioxide（TiO₂） produced by a certain plant,a systemic investigation related to influences of the raw materials and process of post-processing on brightness of TiO₂ was carried out in basis of industrial conditions. The results show that a narrow particle size distribution（250 ~260 nm of average size for initial TiO₂）,sphereapproximate morphology and intermediate crushing dispersant able to decrease the viscosity of inorganic surface treatment system,are beneficial to brightness improvement of TiO₂. Organic agents have no effect on TiO₂ brightness,and a better smash and dispersion effect of intermediate crushing can help to improve the brightness.The inorganic surface treatment increases the brightness by about 0. 18. Furthermore,flash drying treatment and the addition of organic agent into steam powder have basically no impact on the brightness of TiO₂. However,it suffers from carbonization of the organic treatment agent at temperatures higher than 180 ℃ for long hours,which has an adverse effect on the brightness of TiO₂.