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Method for judging graying point in titanium dioxide production

A technology of gray point and titanium dioxide, applied in the field of judging gray point, can solve the problems of inaccurate judgment and fluctuation of titanium dioxide quality.

Active Publication Date: 2010-07-28
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the determination of graying point is mainly based on visual observation, supplemented by time and temperature control, which is highly subjective, and this method of visual observation is not accurate enough, resulting in fluctuations in the quality of titanium dioxide between different batches

Method used

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  • Method for judging graying point in titanium dioxide production
  • Method for judging graying point in titanium dioxide production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 adopts the inventive method to produce titanium dioxide

[0035] Take 25.0 mL of deionized water and add it into the hydrolysis pot as the bottom water, and preheat to 96°C while stirring. Add 100mL of titanium solution preheated to 95°C, with a concentration of 229g / L and an F value of 1.86, into the hydrolysis pot at a uniform speed within 17 minutes, and maintain the temperature of the hydrolysis system at 96°C during the feeding process. After the feeding is complete, the hydrolysis system is heated to the first boiling point (about 106° C.), and the heating rate is maintained at 1.00° C. / min. The heating time is 10 minutes, and the system is kept in a slightly boiling state. Get the hydrolyzed slurry and measure its light transmittance according to the implementation step (4). The sulfuric acid aqueous solution used is 10%, and the dilution volume ratio is 1: 100. When the system turns gray, stop heating and stirring, and ripen for 30 minutes. After a...

Embodiment 2

[0037] Embodiment 2 adopts the inventive method to produce titanium dioxide

[0038] Add 27.0 mL of deionized water into the hydrolysis pot, and preheat to 94°C with stirring. Add 100mL of titanium solution preheated to 95°C, with a concentration of 201g / L and an F value of 1.92, into the hydrolysis pot at a uniform speed within 18 minutes, and maintain the temperature of the hydrolysis system at 94°C during the feeding process. After the feeding is complete, the hydrolysis system is heated to the first boiling point (about 105° C.), and the heating rate is maintained at 1.1° C. / min. The heating time is 10 minutes, and the system is kept in a slightly boiling state. Get the hydrolyzed slurry and measure its light transmittance by the implementation step (4), the sulfuric acid aqueous solution used is 15%, and the dilution volume ratio is 1: 50, when the system changes to the point of graying, stop heating and stirring. It took a total of 20 minutes for gray point and 25 minut...

Embodiment 3

[0040] Embodiment 3 adopts the inventive method to produce titanium dioxide

[0041] Add 23.0 mL of deionized water into the hydrolysis pot, and preheat to 98°C while stirring. Add 100mL of titanium liquid preheated to 98°C, with a concentration of 233g / L and an F value of 1.83, into the hydrolysis pot at a constant speed within 16 minutes, and maintain the temperature of the hydrolysis system at 98°C during the feeding process. After the feeding is complete, the hydrolysis system is heated to the first boiling point (about 106.5° C.), and the heating rate is maintained at 0.77° C. / min. The heating time is 11 minutes, and the system is kept in a slightly boiling state. Get the hydrolyzed slurry and measure its light transmittance according to implementation step (4), the sulfuric acid aqueous solution used is 5%, and the dilution volume ratio is 1: 150, and when the system changes to the gray point, stop heating and stirring, from the end of feeding to the change It took a to...

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Abstract

The invention discloses a method for judging a graying point in titanium dioxide production. By using the method, the graying point of the hydrolyzate of titanium is judged by measuring the transmittance of the solution of the titanium. In the method, a turning point where the transmittance of the hydrolyzate of the titanium reduces suddenly or an extreme point of a first derivative of the transmittance of the solution of the titanium is the graying point of the hydrolyzate of the titanium.

Description

technical field [0001] The invention relates to a method for judging the graying point in the process of producing titanium white through hydrolysis of titanium liquid. Background technique [0002] At present, the domestic production capacity of titanium dioxide has reached 1 million tons / a, and most manufacturers adopt the sulfuric acid method titanium dioxide production process for production. The sulfuric acid titanium dioxide process is mainly divided into self-seeded thermal hydrolysis process and external seed crystal thermal hydrolysis process. However, the autogenous seed crystal thermal hydrolysis process is widely used in China due to its relatively simple process and large production capacity. [0003] The general steps of self-generated seed crystal thermal hydrolysis process are as follows: first add the preheated hydrolyzed titanium solution to deionized water that has been preheated to a certain temperature, and form a certain number and quality of seeds in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33C01G23/053
CPCC01G23/04C01G23/053G01J3/50G01N21/27G01N21/33G01N21/59
Inventor 田从学胡鸿飞杜剑桥陈新红李礼程晓哲
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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