| abstract |
The invention concerns a process for the production of titanium dioxide having: - a TiO2 content of 99% by weight, - an anatase content of at least 98%, - a primary crystallite size of at least 200 nm, - a numerical fraction of at most 10% of crystallites with a size of less than100 nm, - a BET specific surface area of at most 8 m<2>/g, - 1200 to 2400 ppm of alkali (with respect to the quantity of TiO2), - an Al content of at least 1 ppm and at most 1000 ppm (expressed as Al and with respect to the quantity of TiO2), - a weight ratio of AI2O3 to Nb2O5 in the range 0.17 to 0.74, and - at least 0.1% by weight and at most 0.3% by weight of P (expressed as phosphorus and with respect to the quantity of TiO2), as well as the titanium dioxide obtained by this process. |