Method for preparing titanium dioxide slurry

A titanium dioxide slurry, titanium dioxide technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment and other directions, can solve the serious thixotropy of titanium dioxide filter cake, the solid-liquid separation method needs to be improved, and the sodium chloride cannot be separated. and other problems, to achieve the effect of improving efficiency and desalination effect, promoting removal, and thorough solid-liquid separation

Inactive Publication Date: 2017-07-14
YUNNAN METALLURGICAL XINLI TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Sodium chloride crystal particles can completely remove the scars on the oxidation reactor, but it is easy to cause the titanium dioxide particles generated by the reaction to increase the viscosity of the material when adding desalted water for pulping, which is not conducive to the subsequent sand mill dispersion
Therefore, it is necessary to separate the sodium chloride dissolved in the slurry by solid-liquid separation, but due to the presence of hydrogen bonds on the surface of titanium dioxide particles, the titanium dioxide filter cake formed by the traditional solid-liquid separation technology has serious thixotropy and cannot Separation of sodium chloride in slurry
[0005] Therefore, the solid-liquid separation method of titanium dioxide base material needs to be improved

Method used

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  • Method for preparing titanium dioxide slurry

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Effect test

Embodiment 1

[0064] Utilize the method for the embodiment of the invention to TiCl 4 The titanium dioxide particles obtained by oxidation reaction are processed to prepare titanium dioxide slurry, the specific method is as follows:

[0065] (1) TiCl 4 The titanium dioxide particles obtained by the oxidation reaction were added to desalted water to prepare a slurry with a concentration of 450g / L. The pH value of the slurry was 3.08 and the viscosity was 47.2mPa·s;

[0066] (2) get 2L and add the aluminum sulfate solution that mass fraction is 0.2% of titanium dioxide content (its solution concentration is with Al 2 o 3 Calculated as 100g / L), the pH value of the slurry after adding is 2.41, and the viscosity is 45.3mPa·s;

[0067] (3) Add sodium hydroxide to the slurry obtained in step (2) to adjust the pH to 4.50, and the adjusted viscosity is 80.6mPa·s;

[0068] (4) The slurry obtained in step (3) is washed and filtered by a diaphragm filter press, and a complete filter cake is formed ...

Embodiment 2

[0071] Utilize the method for the embodiment of the invention to TiCl 4 The titanium dioxide particles obtained by oxidation reaction are processed to prepare titanium dioxide slurry, the specific method is as follows:

[0072] (1) TiCl 4 The titanium dioxide particles obtained by the oxidation reaction were added to desalted water to prepare a slurry with a concentration of 600g / L. The pH value of the slurry was 3.35 and the viscosity was 70.6mPa·s;

[0073] (2) get 2L and add the aluminum sulfate solution that mass fraction is 0.2% of titanium dioxide content (its solution concentration is with Al 2 o 3 Calculated as 100g / L), the pH value of the slurry after adding is 2.36, and the viscosity is 56.3mPa·s;

[0074] (3) Add sodium hydroxide to the slurry obtained in step (2) to adjust the pH to 4.50, and the adjusted viscosity is 160.8mPa·s;

[0075] (4) The slurry obtained in step (3) is washed and filtered by a diaphragm filter press, and a complete filter cake is formed...

Embodiment 3

[0078] Utilize the method for the embodiment of the invention to TiCl 4 The titanium dioxide particles obtained by oxidation reaction are processed to prepare titanium dioxide slurry, the specific method is as follows:

[0079] (1) TiCl 4 The titanium dioxide particles obtained by the oxidation reaction were added with desalted water to prepare a slurry with a concentration of 450g / L. The pH value of the slurry was 3.37 and the viscosity was 48.2mPa·s;

[0080] (2) get 2L and add the sodium metaaluminate solution (its solution concentration is expressed as Al 2 o 3 Calculated as 100g / L), the pH value of the slurry after adding is 4.08, and the viscosity is 120.3mPa·s;

[0081] (3) adding sulfuric acid to the slurry obtained in step (2) to adjust the pH to 4.50, and the adjusted viscosity is 180.6mPa·s;

[0082] (4) The slurry obtained in step (3) is washed and filtered by a diaphragm filter press, and a complete filter cake is formed on the filter cloth without thixotropy;...

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Abstract

The invention discloses a method for preparing a titanium dioxide slurry. The method comprises the following steps: pulping a titanium dioxide base material to obtain a titanium dioxide protoplasm; mixing and stirring the titanium dioxide protoplasm and an aluminum-containing compound to make the surfaces of titanium dioxide base material particles of the titanium dioxide protoplasm coated with an aluminum film in order to obtain aluminum coated titanium dioxide particles; adjusting the pH value of the slurry for coating the aluminum film to be less than 7 in order to obtain a pH value adjusted slurry; carrying out press filtration treatment on the pH value adjusted slurry to obtain a filter cake; and carrying out mixing and pulping treatment on the filter cake and a dispersant to obtain the titanium dioxide slurry. The method reduces or shields hydrogen bonds on the surfaces of the titanium dioxide base material particles through coating the surfaces of the titanium dioxide base material particles, so the titanium dioxide base material particles easily undergo solid-liquid separation to form the filter cake, sodium chloride is effectively removed, and the viscosity of the titanium dioxide slurry is reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing titanium dioxide slurry. Background technique [0002] Titanium dioxide has high hiding power, whiteness and other pigment performance indicators, and is widely used in coatings, plastics, papermaking, cosmetics and other fields. Its industrial production has two kinds of process technologies: sulfuric acid method and chlorination method. With the improvement of people's product quality requirements and environmental protection awareness, the chlorination method production process has high product quality and environmental friendliness. It is becoming the current and future development. main technology. [0003] The key process of producing titanium dioxide by chlorination process is TiCl 4 Advanced oxidation technology, the quality of its process control directly affects the pigment performance of titanium dioxide. In order to obtain a better particle s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
CPCC09C1/3661C09C3/063
Inventor 李海艳杨振江书安刘建良龙翔张建林赵丽娟
Owner YUNNAN METALLURGICAL XINLI TITANIUM IND CO LTD
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