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Preparation method of nano titanium dioxide---TiCl4 alkali neutralization hydrolysis method
In the chloride process titanium white powder was purified plant TiCl 4 as raw materials, diluted to a certain concentration, the alkaline solution was added and the hydrolysis, the resulting compound of TiO 2 is not washed, dried and calcined TiO 2 nanoparticles obtained after treatment product. Its reaction formula is as follows:
TiCl 4 +4H 2 O===Ti(OH) 4 ↓+4HCl
Ti(OH) 4 ===TiO 2 +2H 2 O
Tioxide UK company took advantage of this method is the synthesis of nano-needle rutile TiO 2 products. A series of nano TiO 2 products produced by Japan Ishihara Industry Co., Ltd. It may also be produced using this method.
The TiOSO 4 solution neutralization method is to react the water-washed metatitanic acid with sulfuric acid to form a pure TiOSO 4 solution, and then to form a certain concentration, then carry out hydrolysis or heating hydrolysis in the alkali, and the formed titanium dioxide hydrate is depolymerized and washed. After the drying treatment, the amorphous TiO 2 product is obtained according to different calcination temperatures. Its reaction formula is as follows:
Alkali neutralization hydrolysis
TiOSO 4 +2NaOH + H 2 O ===Ti(OH) 4 ↓+Na 2 SO 4
Ti(OH) 4 ===TiO 2 +2H 2 O
Heated hydrolysis
TiOSO 4 +2H 2 O===TiO(OH) 2 ↓+H 2 SO 4
TiO(OH) 2 ===TiO 2 +H 2 O
The MT series of Imperial Chemical Company of Japan and the UV-Titan series of Kemira of Finland are produced through this kind of art.
Also known as liquid phase precipitation. That is, the intermediate product of the sulfuric acid method titanium dioxide factory is used as the raw material, and the industrial urea is used as the precipitant to form the metatitanic acid precipitation, and then about 0.01 mol/L of sulfuric acid and deionized water, and the sol and the twelve Sodium alkyl sulfonate is a surfactant, which is then flocculated, spray dried, and calcined in a rotary kiln to obtain nano TiO 2 particles. According to different temperatures used in calcination, products of different crystal forms can be obtained, wherein the product obtained by calcination at 550 ° C is anatase type, and the product obtained by calcination at more than 750 ° C is rutile type, and the particle size of TiO 2 prepared by the method is 20-50 mm. The yield is over 90%.
The method of Japan Ishihara Sangyo Co., Ltd. is to neutralize the hydrolyzed metatitanic acid with ammonia to pH 7, then filter and wash the sulphate, and then add hydrochloric acid to the filter cake to decondense and then adjust with ammonia. Neutral, filtered, washed, and calcined at 400 ~ 700 ° C for 2h to obtain 10 ~ 30nm nano-TiO 2 .