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Preparation method of titanium dioxide slurry

A technology of titanium dioxide slurry and titanium dioxide, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of unfavorable sand grinding dispersion and surface treatment, thixotropy of titanium dioxide filter cake, and increased viscosity of titanium dioxide particles, and achieve Thorough solid-liquid separation, simple operation, and low solid content in the filtrate

Inactive Publication Date: 2018-09-11
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 scabs on the furnace wall of the oxidation reactor, but it is easy to cause the viscosity of the titanium dioxide particles generated by the reaction to increase during the pulping process, which is not conducive to the subsequent sanding dispersion and surface treatment
Therefore, it is necessary to separate the sodium chloride dissolved in the slurry by solid-liquid separation. However, due to the characteristics of polyhydric groups formed on the surface of titanium dioxide particles, the use of traditional solid-liquid separation technology will cause serious damage to the titanium dioxide filter cake. Thixotropic, can not effectively separate the sodium chloride in the slurry
[0005] Therefore, the sodium chloride separation method in the titanium dioxide slurry needs to be improved

Method used

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  • Preparation method of titanium dioxide slurry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Add the titanium dioxide base material obtained by TiCl4 oxidation reaction into desalted water to prepare a titanium dioxide puree with a concentration of 450g / L, the pH value is 2.98, and the viscosity is 45.3mPa·s;

[0053] (2) Take 2L of titanium dioxide original slurry, add ammonium chloride whose mass fraction is 0.3% of the titanium dioxide base material, and stir for 15 minutes to obtain a low-hydroxyl titanium dioxide slurry;

[0054] (3) The low-hydroxyl titanium dioxide slurry is washed and filtered by a diaphragm filter press, and a complete filter cake is formed on the filter cloth without false thickening;

[0055] (4) The filter cake is prepared into a slurry of 700g / L by adding desalinated water, and adding titanium dioxide mass fraction is 0.2% sodium hexametaphosphate (in the form of P 2 o 5 meter), and the pH was adjusted to 9.10, the viscosity of the obtained titanium dioxide slurry was only 27.6mPa·s.

Embodiment 2

[0057] (1) Add the titanium dioxide base material obtained by the TiCl4 oxidation reaction into desalted water to prepare a titanium dioxide puree with a concentration of 600g / L, the pH value is 3.48, and the viscosity is 62.6mPa·s;

[0058] (2) Take 2L of titanium dioxide original slurry, add ammonium chloride whose mass fraction is 0.6% of the titanium dioxide base material, and stir for 15 minutes to obtain a low-hydroxyl titanium dioxide slurry;

[0059] (3) The low-hydroxyl titanium dioxide slurry is washed and filtered by a diaphragm filter press, and a complete filter cake is formed on the filter cloth without false thickening;

[0060] (4) The filter cake is prepared into a slurry of 700g / L by adding desalinated water, and adding titanium dioxide mass fraction is 0.2% sodium hexametaphosphate (in the form of P 2 o 5 meter), and the pH was adjusted to 10.02, the viscosity of the obtained titanium dioxide slurry was only 38.3mPa·s.

Embodiment 3

[0062] (1) Add the titanium dioxide base material obtained by TiCl4 oxidation reaction into desalted water to prepare a titanium dioxide puree with a concentration of 450g / L, the pH value is 3.91, and the viscosity is 49.6mPa·s;

[0063] (2) Take 2L of titanium dioxide original slurry, add ammonium bicarbonate whose mass fraction is 0.8% of the titanium dioxide base material, and stir for 30 minutes to obtain a low-hydroxyl titanium dioxide slurry;

[0064] (3) The low-hydroxyl titanium dioxide slurry is washed and filtered by a diaphragm filter press, and a complete filter cake is formed on the filter cloth without false thickening;

[0065] (4) The filter cake is prepared into a slurry of 700g / L by adding desalinated water, and adding titanium dioxide mass fraction is 0.2% sodium hexametaphosphate (in the form of P 2 o 5 meter), and the pH was adjusted to 10.12, the viscosity of the obtained titanium dioxide slurry was only 32.8mPa·s.

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Abstract

The invention discloses a preparation method of titanium dioxide slurry. The preparation method comprises following steps: (1) pulping a titanium dioxide basic material and water to obtain titanium dioxide raw stock; (2) mixing titanium dioxide raw stock with ammonium salts, and stirring to obtain titanium dioxide slurry with a low hydroxyl content; (3) press-filtering the titanium dioxide slurrywith a low hydroxyl content to obtain filter cakes; and (4) mixing the filter cakes with a dispersant, and carrying out pulping to obtain titanium dioxide slurry. According to the method, hydroxyl groups on the titanium dioxide particle surface are reduced, titanium dioxide slurry with a low hydroxyl content can be made into filter cakes easily, thus solid-liquid separation is realized, and the goal of effectively removing sodium chloride is achieved.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular, the invention relates 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 methods mainly include sulfuric acid method and chlorination method. With the improvement of product quality requirements and the improvement of environmental protection awareness, the chlorination production process is becoming the main production process technology for current and future development due to its high product quality and environmental friendliness. [0003] The key process of producing titanium dioxide by chlorination is TiCl 4 The quality of the gas phase oxidation technology, its process control directly affects the pigment performance of titanium dioxide. In orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 杨振李海艳龙翔张建林赵丽娟代红平张军丽江书安李凤蓉
Owner YUNNAN METALLURGICAL XINLI TITANIUM IND CO LTD