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This method is similar to the principle of producing white carbon black by a gas phase method, in which TiCl 4 gas is introduced into an oxyhydrogen flame (700 to 1000 ° C) for gas phase hydrolysis. Its reaction formula is as follows:
TiCl 4 (g) + 2H 2 (g) + O 2 (g) = = = TiO 2 (s) + 4 HCl (g)
This method was first developed by the German company Degussa (Degussa AG) successfully, and one current output Nano Titanium white powder known brands of P-25. In addition, the United States Cabot Corporation and Japan Aerosil Corporation used this method to produce nano titanium dioxide. Nano titanium dioxide produced by this method is generally a mixture of rutile and anatase gold having a high purity product (99.5%), narrow size distribution, nonporous smooth surface, good dispersion and agglomeration degree than Small features. Mainly used in electronic materials, catalysts, UV shielding agents and functional ceramics. This kind of process features short process and high degree of automation. However, due to its high process temperature, severe corrosion, strict material requirements, and precise control of process parameters, the product cost is high, and the investment is large. .
The process can control the crystal form of the product by adjusting the volume concentration of hydrogen in the mixed gas of TiCl 4 , H 2 and air. Generally, the volume concentration of hydrogen is controlled at 15% to 17%, and the rutile type nano TiO 2 is obtained, which is low. At or above this ratio, the mixed crystal nano-TiO 2 is obtained . China Shenyang Yongxin Chemical Co., Ltd. has used this method to prepare nano-TiO 2 based on its fumed silica technology.