Production method of high-resistivity titanium dioxide

Abstract

The invention relates to a production method of high-resistivity titanium dioxide, which belongs to the field of titanium dioxide production. The invention provides the production method of the high-resistivity titanium dioxide, which adopts a sulfuric acid method titanium dioxide production process and comprises the following steps of hydrolyzation of titanium liquid, washing, salt treatment, and calcination plus milling, wherein a potassic substance is added in the salt treatment step; the addition quantity of the potassic substance occupies 0.39 to 0.47 wt% of the titanium dioxide content; and the potassic substance is potassic alkali or salt. The resistivity of the titanium dioxide produced by utilizing the method provided by the invention is higher than the resistivity of the titanium dioxide produced in the prior art by 900 Omega.cm, and meanwhile, the brightness, the whiteness, the pH (potential of hydrogen) of the titanium dioxide are guaranteed to satisfy the operation requirements.

Description

technical field

[0001] The invention relates to a production method of high-resistivity titanium dioxide, which belongs to the field of titanium dioxide production. Background technique

[0002] Titanium dioxide (also known as titanium dioxide) has stable physical and chemical properties, excellent optical and electrical properties, and excellent pigment performance, so it is widely used in coatings, plastics, papermaking, printing inks, chemical fibers, rubber, cosmetics and other industries. The production methods of titanium dioxide mainly include sulfuric acid method and chlorination method.

[0003] The sulfuric acid method is to use titanium concentrate or acid-soluble titanium slag to react with sulfuric acid for acid hydrolysis to obtain titanyl sulfate solution, which is hydrolyzed to obtain metatitanic acid precipitation, and then enters the rotary kiln for calcination to produce TiO 2 . The sulfuric acid method can produce both anatase and rutile products. The ...

Examples

preparation example Construction

[0019] A preparation of titanium liquid

[0020] Titanium slag and titanium ore were reacted with sulfuric acid to obtain titanium solution, and the titanium solution was prepared with water to meet the hydrolysis requirements of concentrated titanium solution. The specific indicators of the concentrated titanium solution are shown in Table 1:

[0021] Table 1 Indicators of concentrated titanium solution

[0022]

[0023] Note: For the stability (ml / ml) in the table, the preceding "ml" represents the amount of distilled water, and the following "ml" represents 1ml of concentrated titanium solution.

[0024] Hydrolysis of B titanium solution

[0025] The hydrolysis process of the present invention is consistent with the conventional normal-pressure hydrolysis with external seed crystals, that is, after preheating the titanium solution → preparing the seed crystals → hydrolyzing, metatitanic acid can be obtained, and the particle size is D50 (D represents the diameter of the...

Embodiment 1

[0039] (1) The indicators of concentrated titanium solution are shown in Table 2;

[0040] Table 2 Indicators of concentrated titanium solution

[0041]

[0042] (2) The hydrolysis process is consistent with the existing external seed crystal hydrolysis at normal pressure, that is, the metatitanic acid can be obtained after preheating the titanium solution → preparing the seed crystal → hydrolyzing, and the particle size D50 is: 1.51 μm;

[0043] (3) Put the rinsed slurry into a salt treatment pot, add shallow desalted water to adjust the concentration of metatitanic acid slurry to 328g / l;

[0044] (4) After the slurry was stirred for 30 minutes, potassium hydroxide was added, and the addition of potassium hydroxide was 0.46wt% of the titanium dioxide content (based on the titanium dioxide content in metatitanic acid), stirred for 30min, and then added 0.28wt% of the titanium dioxide content phosphoric acid, stirred for 30min, and fed to the storage tank in front of the ki...

Embodiment 2

[0049] Except that the add-on of potassium hydroxide in step (4) is different from that in Example 1, other steps are all the same as in Example 1, and the add-on of potassium hydroxide in step (4) is 0.41wt% of titanium dioxide content; Gained product performance As shown in Table 4.

technical field

[0001] The invention relates to a production method of high-resistivity titanium dioxide, which belongs to the field of titanium dioxide production. Background technique

[0002] Titanium dioxide (also known as titanium dioxide) has stable physical and chemical properties, excellent optical and electrical properties, and excellent pigment performance, so it is widely used in coatings, plastics, papermaking, printing inks, chemical fibers, rubber, cosmetics and other industries. The production methods of titanium dioxide mainly include sulfuric acid method and chlorination method.

[0003] The sulfuric acid method is to use titanium concentrate or acid-soluble titanium slag to react with sulfuric acid for acid hydrolysis to obtain titanyl sulfate solution, which is hydrolyzed to obtain metatitanic acid precipitation, and then enters the rotary kiln for calcination to produce TiO 2 . The sulfuric acid method can produce both anatase and rutile products. The ...

Examples

preparation example Construction

[0019] A preparation of titanium liquid

[0020] Titanium slag and titanium ore were reacted with sulfuric acid to obtain titanium solution, and the titanium solution was prepared with water to meet the hydrolysis requirements of concentrated titanium solution. The specific indicators of the concentrated titanium solution are shown in Table 1:

[0021] Table 1 Indicators of concentrated titanium solution

[0022]

[0023] Note: For the stability (ml / ml) in the table, the preceding "ml" represents the amount of distilled water, and the following "ml" represents 1ml of concentrated titanium solution.

[0024] Hydrolysis of B titanium solution

[0025] The hydrolysis process of the present invention is consistent with the conventional normal-pressure hydrolysis with external seed crystals, that is, after preheating the titanium solution → preparing the seed crystals → hydrolyzing, metatitanic acid can be obtained, and the particle size is D50 (D represents the diameter of the...

Embodiment 1

[0039] (1) The indicators of concentrated titanium solution are shown in Table 2;

[0040] Table 2 Indicators of concentrated titanium solution

[0041]

[0042] (2) The hydrolysis process is consistent with the existing external seed crystal hydrolysis at normal pressure, that is, the metatitanic acid can be obtained after preheating the titanium solution → preparing the seed crystal → hydrolyzing, and the particle size D50 is: 1.51 μm;

[0043] (3) Put the rinsed slurry into a salt treatment pot, add shallow desalted water to adjust the concentration of metatitanic acid slurry to 328g / l;

[0044] (4) After the slurry was stirred for 30 minutes, potassium hydroxide was added, and the addition of potassium hydroxide was 0.46wt% of the titanium dioxide content (based on the titanium dioxide content in metatitanic acid), stirred for 30min, and then added 0.28wt% of the titanium dioxide content phosphoric acid, stirred for 30min, and fed to the storage tank in front of the ki...

Embodiment 2

[0049] Except that the add-on of potassium hydroxide in step (4) is different from that in Example 1, other steps are all the same as in Example 1, and the add-on of potassium hydroxide in step (4) is 0.41wt% of titanium dioxide content; Gained product performance As shown in Table 4.

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