Cooling method for improving quality of titanium dioxide

A cooling method, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of lattice defects, pigment performance degradation, poor quality, etc., to avoid lattice defects, improve brightness and whiteness, The effect of improving quality

Inactive Publication Date: 2018-08-28
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, the sulfuric acid process rutile titanium dioxide products obtained by the traditional process have lattice defects, which lead to poor quality and reduce the performance of pigments.

Method used

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  • Cooling method for improving quality of titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The salt-treated filter cake before the kiln is sent to the rotary kiln by screw for dehydration and desulfurization and crystal transformation. The rotary kiln shaking head temperature is controlled at 960~980°C, and it is calcined until the rutile content is 90%. Then it is sent to the slow cooling device for slow cooling and aging. , Cool slowly to 900°C within 4 hours, then enter the rapid cooling device, cool to below 50°C, obtain high-brightness and high-whiteness kiln products, and enter the subsequent crushing coating.

Embodiment 2

[0016] The salt-treated filter cake before the kiln is sent to the rotary kiln by screw for dehydration and desulfurization and crystal transformation. The rotary kiln shaking head temperature is controlled at 960~980°C, and it is calcined until the rutile content is 92%. Then it is sent to the slow cooling device for slow cooling and aging. , Slowly cool to 900°C within 2 hours, then enter the rapid cooling device, cool to below 50°C, obtain high-brightness and high-whiteness kiln products, and enter the subsequent crushing coating.

Embodiment 3

[0018] The salt-treated filter cake before the kiln is sent to the rotary kiln by screw for dehydration and desulfurization, crystal transformation, controlled rotary kiln shaking head temperature 960~980°C, calcined until the rutile content is 96%, and then sent to the slow cooling device for slow cooling and aging , Slowly cool to 850°C within 1 hour, then enter the rapid cooling device, cool to below 50°C, obtain high-brightness and high-whiteness kiln products, and enter the subsequent crushing coating.

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Abstract

The invention relates to a cooling method for improving the quality of titanium dioxide. The method comprises the steps of calcination and cooling for preparing metatitanic acid in titanium dioxide bya sulfuric acid method, and the maximum temperature of the calcination step is 960-980 DEG C; the cooling step comprises a slow cooling stage and a rapid cooling stage; the final temperature of the slow cooling stage is not lower than 850 DEG C, and the cooling time is not less than 1 hour. By controlling the lower temperature of a kiln head, natural gas consumption can be saved, the production cost is saved, the low conversion rate of fall kiln product rutile is controlled, and the risk of reducing the quality of titanium dioxide due to over-burning is avoided. A slow cooling device is addedto avoid the lattice defects of calcined rutile titanium dioxide, the brightness and whiteness of a product are improved, and the quality is improved.

Description

technical field [0001] The invention specifically relates to a cooling method for improving the quality of titanium dioxide, which belongs to the technical field of titanium dioxide production equipment. Background technique [0002] In the production process of rutile titanium dioxide prepared by sulfuric acid method, calcination is one of the important links affecting the quality of titanium dioxide. The calcination process involves the dehydration, desulfurization and crystal transformation process in the rotary kiln in the front section, and also includes the cooling machine in the back section. cooling process. It is generally believed in the industry that the highest temperature in the calcination stage determines the rutile conversion rate of titanium dioxide. The higher the calcination temperature, the higher the rutile conversion rate and the better the quality of the obtained rutile titanium dioxide product. Therefore, the existing process generally controls the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08C01G23/047
CPCC01G23/08C01G23/047C01P2006/62C01P2006/65
Inventor 林发蓉张玉荣杜国华钟晓英周春勇姚恒平
Owner SICHUAN LOMON TITANIUM IND CO LTD
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