No abstract

Rutile titanium dioxide (TiO2) white pigment has been prepared by doping and calcination of metatitanic acid (H2TiO3) obtained by the NaOH molten salt method. It was found that the properties of the rutile TiO2 sample prepared were improved by adding K2O, P2O5, Al2O3, and rutile nuclei. The X-ray diffraction (XRD) results show the rutile content of the rutile TiO2 sample prepared is 97%, and scanning electron microscopy (SEM) results show that the rutile TiO2 particles prepared have well-shaped morphology and narrow particle size distribution. The purity and color performance of the rutile TiO2 sample prepared approached the commercial TiO2 pigment standards.

The kinetics of the decomposition of acid dissolved titanium slag with a sodium hydroxide system under atmospheric pressure was studied. The effect of reaction temperature, particle size and NaOH-to-slag mass ratio on titanium extraction was investigated. The results show that temperature and particle size have significant influence on titanium extraction. The experimental data of titanium extraction show that the shrinking core model with chemical reaction controlled process is most applicable for the decomposition of slag, with an apparent activation energy of 62.4 kJ⋅mol −1 . Approximately 85 wt.%-90 wt.% of the titanium can be extracted from the slag under the optimal conditions. In addition, the purity of titanium dioxide obtained in the product is up to 98.5 wt.%.