The process of producing titanium dioxide by chlorination process: the first step is to blow the titanium-rich ore and coke into the fluidized bed reactor; The second step is chlorinated by high-temperature chlorine gas; In the third step, the treated titanium tetrachloride gas and oxygen are sent to the oxidation reaction chamber for reaction, and TiO2 is separated by certain means. The most important part is the oxidation reaction of titanium tetrachloride, that is, titanium tetrachloride reacts with oxygen to produce the precursor of TiO2 through a rapid oxidation reaction. When the number of precursors gradually becomes saturated during the reaction, titanium dioxide begins to nucleate, and titanium tetrachloride and oxygen are adsorbed and dissociated on the surface, which contributes to the growth of crystal nuclei. The crystal of titanium dioxide grows by a certain cluster, and the crystal structure required by industry can be obtained after subsequent treatment, and the particle size can meet the requirements.

Natural rutile titanite, artificial rutile, white titanite and crude ilmenite can all be used as industrial raw materials for the production of titanium dioxide by chlorination . The process of making titanium white with rutile and artificial rutile as raw materials mainly includes: chlorination of titanium-rich ore; Purification of titanium tetrachloride; Oxidation reaction of titanium tetrachloride with oxygen;

Subsequent treatment of titanium dioxide initial product. The process of chlorination is short, low energy consumption, high degree of automation, less "three wastes", high product quality, and convenient for the expansion of production capacity, so it has been rapidly developed. The main reaction mechanism is shown in Equation (4) ~ (6).

Titanium chlorination: TiO2 + 2C + 2Cl2 → TiCl4 + 2CO (4)

Crude material purification: TiCl4(impure gas) → TiCl4(pure liquid) (5)

Oxygen reaction: TiCl4 + O2 → TiO2 + 2Cl2 (6)

Formula (4) represents the chlorination process of titanium-rich ore. After mixing titanium-rich with coke at high temperature at 925 ~ 1010℃, high-temperature chlorine gas is added to the fluidized bed reactor for chlorination reaction. Based on the difference of boiling points, Titanium tetrachloride and other chlorinated products can be separated. At the same time, due to the difference in partial pressure and solubility of the substance, the gas after chlorination is separated and purified to obtain crude TiCl4.

Formula (5) represents the purification process of crude titanium tetrachloride. The chlorinated products obtained by chlorination are removed with organic matter, and chloride impurities such as high boiling point and low boiling point are removed. Finally, TiCl4 with high purity is obtained by distillation.

Formula (6) represents the oxidation process. The high purity TiCl4 is quickly mixed with high temperature oxygen through a container containing AlCl3 additive at high temperature to produce the primary product of titanium dioxide. After a series of operations, the gas and solid are separated to obtain TiO2, and then the excess Cl2 is recovered. Since a small amount of chlorine atoms are adsorbed on the surface, dechlorination operations are required to finally obtain qualified rutile Ti02.