Preparation method of hydrated titanium dioxide double-effect seed crystal
A technology for hydrating titanium dioxide and double-effect seed crystals, which is applied in the directions of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of unusable rutile seed crystals, difficult operation control, complicated production process, etc. The effect of shortening production time, convenient and easy-to-obtain raw materials, and easy-to-obtain raw materials
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Embodiment 1
[0045] Take the second washing cake in the production process of sulfuric acid method, and beat it to obtain TiO-containing 2It was 592g of 326.5g / l metatitanic acid slurry, and its iron content was determined to be 32ppm. The above slurry was added to 618g of 97.13% concentrated sulfuric acid with a constant flow pump, and the temperature was raised to 143°C for 30 minutes to obtain a dark brown transparent liquid. Add 106 milliliters of desalted water and adjust concentration to 160g / L (with TiO 2 meter), then cooled to room temperature, filtered, and beaten to obtain 1170g, the content of which was TiO 2 =200.37g / L, F=4.01 titanium sulfate solution.
[0046] Get 1316g industrial sodium carbonate preparation 160g / L concentration, its pH=13.55. Use a constant flow pump to add the above titanium sulfate solution into the sodium carbonate solution at a constant speed within 60 minutes, the end point pH=8.5, then stir the reaction (ie aging) for 10 minutes, and adjust the pH b...
Embodiment 2
[0052] With example 1, neutralize with the sodium carbonate solution of 90g / L, terminal pH=7, other operations are constant, and obtain 2340g, concentration is 87g / L (with TiO 2 meter) orthotitanic acid solution.
[0053] Add 190 g of concentrated hydrochloric acid and 15 g of concentrated nitric acid to the slurry within 5 minutes, and homogenize and stir for 2 hours. Raise the temperature to 82°C in 20 minutes, keep the temperature for 120 minutes, then cool to normal temperature, and use 25% dilute ammonia water to neutralize to around pH=7 within 10 minutes. The above slurry was separated and washed until no chlorine was detected. After storing the filter cake for 6 months, make a slurry of 35g / L (based on TiO 2 ) of the slurry for use.
[0054] The hydrolysis operation was the same as in Example 1, and the hydrolysis rate was 96.6%. The calcination operation was the same as in Example 1, so as to obtain a titanium dioxide pigment with a rutile titanium dioxide content ...
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