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

Active Publication Date: 2011-08-17
四川安宁铁钛股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The seeds used in the above two processes can only be used in the hydrolysis process. The metatitanic acid obtained by the hydrolysis of these two kinds of seeds does not contain rutile inducer, and cannot be used in the calcination process to prepare rutile titanium dioxide. For rutile titanium dioxide, a special rutile seed must be introduced before calcination, but this rutile seed cannot be used in the hydrolysis process
The existing technical route needs to add different crystal seeds in the hydrolysis and calcination sections to produce rutile titanium dioxide, resulting in complex production process and difficult operation control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention belongs to the technical field of the production of titanium dioxide and in particular relates to a preparation method of hydrated titanium dioxide double-effect seed crystal. The preparation method comprises the following steps: adding sulfuric acid in metatitanic acid slurry to prepare titanium sulfate solution, using titanium sulfate solution and sodium carbonate to react and generate titanic acid, and using monoprotic acid to neutralize titanic acid and obtain the finished product. The hydrated titanium dioxide double-effect seed crystal can be a solid object with a certain water content or slurry of which concentration is less than 220g/L (calculated by TiO2). The rutile-type TiO2 content of the seed crystal is 5-95% of the total weight of TiO2 and the seed crystal also contains anatase TiO2 and amorphous TiO2. The seed crystal is added in the hydrolysis process of titanium-containing solution, wherein the weight percentage is 1-3% which is calculated by TiO2; and after hydrolysis, new rutile-type seed crystal is not required to be added in the calcining link.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide production, in particular to a method for preparing hydrated titanium dioxide double-effect seed crystals. Background technique [0002] In the production of titanium dioxide by sulfuric acid method, there are usually two production processes in the process of hydrolyzing the sulfuric acid solution containing titanium: one uses self-generated seed crystals, and the other uses the addition of anatase-containing titanium dioxide made from ammonia or sodium hydroxide. Seed. The seeds used in the above two processes can only be used in the hydrolysis process. The metatitanic acid obtained by the hydrolysis of these two kinds of seeds does not contain rutile inducer, and cannot be used in the calcination process to prepare rutile titanium dioxide. For rutile titanium dioxide, a special rutile seed must be introduced before calcination, but this rutile seed cannot be used in the hydrolysis pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01G23/053C01G23/08
Inventor 罗阳勇景建林唐盛伟李顺泽
Owner 四川安宁铁钛股份有限公司
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