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Preparation method of titanium dioxide

A titanium dioxide, titanium oxychloride clear liquid technology, applied in chemical instruments and methods, inorganic chemistry, titanium compounds and other directions, can solve the problems of large central particle size, serious agglomeration, large titanium particle size, etc. The effect of narrow diameter distribution and high crystallinity

Inactive Publication Date: 2014-01-22
韩城市微晶电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium dioxide is used as the main material of electronic ceramic components. Due to various reasons, the titanium dioxide provided by the market has a large particle size, serious agglomeration, large central particle size (D50) and poor dispersion, or low purity, which is difficult to fully meet the strict requirements of the electronics industry. Require

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  • Preparation method of titanium dioxide
  • Preparation method of titanium dioxide
  • Preparation method of titanium dioxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The specific steps of the method for preparing titanium dioxide of the present invention are as follows:

[0028] Step 1. The titanium tetroxide is dissolved in deionized water, and the reaction temperature is controlled at 85±3° C. to obtain a titanyl chloride solution with a titanium concentration of 3.5±0.2 mol / L. The chemical reaction equation in this step is:

[0029] TiCl 4 +H 2 O===TiOCl 2 +2HCl.

[0030] Step 2. Add ammonia water to the titanyl chloride solution obtained in step 1, the concentration of ammonia water is 9.2±0.2 mol / L, the acidity of the liquid after adding ammonia water is 4.5±0.5mol / L, and the reaction temperature is controlled at 90±3 °C to obtain a mixed buffer clear solution of hydrochloric acid, titanyl chloride and ammonium chloride. The chemical reaction equation in this step is:

[0031] NH 3 ·H 2 O+HCl===NH 4 Cl+H 2 O.

[0032] Step 3. Add a dispersant to the mixed buffer clear solution obtained in Step 2, and the reaction temperature is contro...

Embodiment 2

[0042] The specific steps of the method for preparing titanium dioxide of the present invention are as follows:

[0043] Step 1. The titanium tetroxide is dissolved in deionized water, and the reaction temperature is controlled at 85±3° C. to obtain a titanyl chloride solution with a titanium concentration of 3.5±0.2 mol / L.

[0044] Step 2. Add ammonia water to the titanyl chloride solution obtained in step 1, the concentration of ammonia water is 9.2±0.2 mol / L, the acidity of the liquid after adding ammonia water is 5.5±0.5mol / L, and the reaction temperature is controlled at 90±3 °C to obtain a mixed buffer clear solution of hydrochloric acid, titanyl chloride and ammonium chloride.

[0045] Step 3. Add a dispersant to the mixed buffer clear solution obtained in step 2, and the reaction temperature is controlled at 110±1° C., hydrolyzed at a constant temperature for 50 minutes to obtain a metatitanic acid slurry. The dispersant is gum arabic powder, and the mass of gum arabic powde...

Embodiment 3

[0049] The specific steps of the method for preparing titanium dioxide of the present invention are as follows:

[0050] Step 1. Dissolve titanium tetroxide in deionized water, and control the reaction temperature at 85±3°C to obtain a titanium dichloride clear solution with a titanium concentration of 3.5±0.2 mol / L.

[0051] Step 2. Add ammonia water to the titanyl chloride solution obtained in step 1, the concentration of ammonia water is 9.2±0.2mol / L, the acidity of the liquid after adding ammonia water is 6.5±0.5mol / L, and the reaction temperature is controlled at 90±3 °C to obtain a mixed buffer clear solution of hydrochloric acid, titanyl chloride and ammonium chloride.

[0052] Step 3. Add a dispersant to the mixed buffer clear liquid obtained in step 2, and control the reaction temperature at 110±1°C, and hydrolyze at a constant temperature for 70 minutes to obtain a metatitanic acid slurry. The dispersant is gum arabic powder, and the mass of the gum arabic powder is 2‰ of ...

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Abstract

The invention discloses a preparation method of titanium dioxide. The preparation method concretely comprises the following steps of dissolving titanium tetraoxide by using deionized water to obtain a titanium oxychloride clear solution; adding ammonia water to the titanium oxychloride clear solution; when the ammonia water is added, controlling the acidity of liquid to meet the requirement of controlling the particle size range of the titanium dioxide so as to obtain a mixed buffer clear solution of hydrochloric acid, titanium oxychloride and ammonium chloride; adding a dispersing agent, hydrolyzing at constant temperature to obtain metatitanic acid slurry; adding a surface treating agent, keeping temperature for a certain time, then carrying out pressure filtration, and calcining an obtained metatitanic acid filter cake at high temperature; cooling, crushing, and screening to obtain titanium dioxide powder. The titanium dioxide prepared through the method disclosed by the invention has the advantages of narrow particle size distribution, high crystallinity and controllable particle size, and is easy to disperse.

Description

Technical field [0001] The invention belongs to the technical field of chemical engineering, and specifically relates to a method for preparing titanium dioxide. Background technique [0002] At present, manufacturers of electronic appliances and communication equipment systems have put forward more and more stringent requirements on the reliability of various electronic components. High-purity, ultra-fine electronic grade and easily dispersed raw materials have become the key and core of making ultra-fine, ultra-thin, high-performance electronic ceramic components. Titanium dioxide is the main material of electronic ceramic components. Due to various reasons, the titanium dioxide provided in the market has large particle size, serious agglomeration, large central particle size (D50), poor dispersion, or low purity, which is difficult to fully meet the stringent requirements of the electronics industry. Claim. Summary of the invention [0003] The purpose of the present inventio...

Claims

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Application Information

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IPC IPC(8): C01G23/00
Inventor 张深强牛顺祥牛多
Owner 韩城市微晶电子材料有限公司
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