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Method for preparing titanium dioxide hydrolysis crystal seed

A technology of seed crystal and titanium dioxide, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve equipment requirements. Low seed rutile is used to prepare titanium dioxide plus hydrolyzed crystal seed, which affects the dispersion of seed crystals and affects the quality of seed crystals, etc. problem, to achieve the effect of low equipment requirements, stable seed crystal activity and high content

Active Publication Date: 2010-10-20
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two problems affecting the quality of the seed crystals in this method: first, the peptization slurry contains a large amount of NaCl, which makes the quality of the obtained seed crystals poor; second, the dispersion of the seed crystals after filtration and washing will seriously affect the dispersibility of the crystal seeds
[0006] So far, there are no relevant reports on the method of preparing titanium dioxide plus hydrolysis seed crystals with simple process, low equipment requirements, high seed crystal rutile content and stable quality

Method used

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  • Method for preparing titanium dioxide hydrolysis crystal seed
  • Method for preparing titanium dioxide hydrolysis crystal seed
  • Method for preparing titanium dioxide hydrolysis crystal seed

Examples

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Effect test

Embodiment 1

[0026] Example 1 Preparation of titanium dioxide plus hydrolyzed seed crystals by the method of the present invention

[0027] In the NaOH solution of 90mL 2wt%, add concentration and be 450g / L (as TiO 2 count) TiCl 4 Aqueous solution, neutralized to pH 0.5, while keeping the system temperature not exceeding 40°C. After fully stirring, the temperature was raised to 60°C at a heating rate of 0.5°C / min, and kept for 20 minutes of aging, and the system was cooled to room temperature to obtain titanium dioxide plus hydrolysis seeds, and the TiO2 was analyzed chemically. 2 The content is 30g / L. Through X-ray diffraction (XRD) analysis, the rutile content of gained seed crystal is greater than 99%, and XRD diffractogram sees figure 1 . After standing for 25 days, it can still be used as a hydrolysis seed.

Embodiment 2

[0028] Example 2 Using the method of the present invention to prepare titanium dioxide plus hydrolyzed seed crystals

[0029] In the NaOH solution of 90mL 5wt%, add concentration and be 250g / L (as TiO 2 count) TiCl 4 Aqueous solution, neutralized to pH 0, while keeping the system temperature not exceeding 40°C. After fully stirring, the temperature was raised to 75°C at a heating rate of 3°C / min, and kept for 40 minutes of aging, and the system was cooled to room temperature to obtain titanium dioxide plus hydrolyzed seed crystals, and the TiO2 was analyzed chemically. 2 The content is 35g / L. Through X-ray diffraction (XRD) analysis, the rutile content of gained seed crystal is greater than 99%, and XRD diffractogram sees figure 2 . After standing for 25 days, it can still be used as a hydrolysis seed.

Embodiment 3

[0030] Example 3 Using the method of the present invention to prepare titanium dioxide plus hydrolyzed seed crystals

[0031] To 90mL of 15wt% KOH solution, add a concentration of 200g / L (as TiO 2 count) TiCl 4 Aqueous solution, neutralized to pH 2, while keeping the system temperature not exceeding 40°C. After fully stirring, the temperature was raised to 75°C at a heating rate of 3°C / min, and kept for 90 minutes of aging, and the system was cooled to room temperature to obtain titanium dioxide plus hydrolysis seeds, and the TiO2 was analyzed chemically. 2The content is 45g / L. Through X-ray diffraction (XRD) analysis, the rutile content of gained seed crystal is greater than 99%, and XRD diffractogram sees image 3 . It can still be used as a hydrolysis seed after 20 days of storage.

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Abstract

The invention relates to a method for preparing a titanium dioxide hydrolysis crystal seed, which belongs to the field of chemical industries. The invention solves the technical problem of providing the method for preparing the titanium dioxide hydrolysis crystal seed. The method has the characteristics of a low requirement on equipment, high rutile content of the prepared seed crystal, and stable quality of the rutile. The method for preparing the titanium dioxide hydrolysis crystal seed comprises the following steps of: a, adding aqueous solution of titanium tetrachloride (TiCl4) into alkaline solution and neutralizing the alkaline solution till the pH value is between 0 and 2, wherein the concentration of the aqueous solution of the TiCl4 is 200 to 450 g / L in terms of titanium dioxide (TiO2); b, neutralizing the obtained slurry, then uniformly stirring and heating to the temperature of between 60 and 90 DEG C, and maintaining the temperature for 0 to 90 minutes; and c, cooling the slurry to the room temperature to obtain the titanium dioxide hydrolysis crystal seed. The method has the characteristics of simple process, low requirement on the equipment, high rutile content of the prepared seed crystal, and stable activity of the seed crystal.

Description

technical field [0001] The invention relates to a method for preparing titanium dioxide plus hydrolyzed seed crystals, which belongs to the field of chemical industry. Background technique [0002] At present, the production process of domestic titanium dioxide is mostly the sulfuric acid method, and hydrolysis is one of the extremely important processes in this process. The hydrolysis process is generally divided into two types: self-generated seed crystal hydrolysis process and external seed crystal hydrolysis process. Compared with the autogenous seed crystal hydrolysis process, the external seed crystal hydrolysis process has the advantages of controllable seed crystal quantity, stable seed crystal quality, little quality fluctuation between product batches, and no concentration of hydrolyzed titanium solution. A more advanced hydrolysis process. [0003] The key to the seed crystal hydrolysis process lies in the preparation of the seed crystal. There are two main pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 李礼杜剑桥陈新红王勇许述林邓仁友胡军
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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