Method for producing titanium dioxide

A technology of titanium dioxide and titanium liquid, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of increasing production processes and production costs, and achieve the effects of simplifying production processes, narrow particle size distribution, and saving production costs

Inactive Publication Date: 2011-06-29
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires additional preparation of seed crystal liquid titanium, which increases the production process and production cost

Method used

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  • Method for producing titanium dioxide
  • Method for producing titanium dioxide
  • Method for producing titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Embodiment 1 adopts the inventive method to produce titanium dioxide

[0040] Take 29.0ml of deionized water and add it into the hydrolysis pot, and preheat to 96°C while stirring. Add 100ml of hydrolyzed titanium solution preheated to 95°C, with a concentration of 222g / l and an F value of 1.83, into the hydrolysis pot at a constant speed within 17 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 boiling (about 104° C.), and the heating rate is maintained at 1.20° C. / min. The heating time is 5 minutes, and the system is kept in a slightly boiling state. When the solution turns gray (that is, the gray point), stop heating and stirring, and ripen for 30 minutes. After the aging was completed, the system was heated and boiled again (about 105° C.) under stirring, and the heating rate was kept at 2.0° C. / min, and the heating time was 12 minutes, and the system...

Embodiment 2

[0042] Embodiment 2 adopts the inventive method to produce titanium dioxide

[0043] Use sulfuric acid solution to adjust the pH of the deionized water to 8.30, take 26.0ml into the hydrolysis pot, and preheat to 94°C while stirring. Add 100ml of hydrolyzed titanium solution preheated to 95°C, with a concentration of 202g / l and an F value of 1.85, into the hydrolysis pot at a constant speed within 17 minutes, and maintain the temperature of the hydrolysis system at 95°C during the feeding process. After the feeding is complete, the hydrolysis system is heated to boiling (about 102.5° C.), and the heating rate is maintained at 1.07° C. / min. The heating time is 7 minutes, and the system is kept in a slightly boiling state. When the solution turns gray (that is, the gray point), stop heating and stirring, and ripen for 30 minutes. After the aging was completed, the system was heated to boiling (about 103.5° C.) under stirring, and the heating rate was maintained at 2.4° C. / min. ...

Embodiment 3

[0045] Embodiment 3 adopts the inventive method to produce titanium dioxide

[0046] Use sulfuric acid solution to adjust the pH of the deionized water to 4.80, take 23.0ml into the hydrolysis pot, and preheat to 96°C while stirring. Add 100ml of hydrolyzed titanium solution preheated to 95°C, with a concentration of 231g / l and an F value of 1.73, into the hydrolysis pot at a constant speed within 18 minutes, and maintain the temperature of the hydrolysis system at 95.5°C during the feeding process. After the feeding is complete, the hydrolysis system is heated to boiling (about 104.5° C.), and the heating rate is maintained at 1.41° C. / min. The heating time is 6.4 minutes, and the system is kept in a slightly boiling state. When the solution turns gray (that is, the gray point), stop heating and stirring, and ripen for 30 minutes. After the aging was completed, the system was heated again to boiling (about 105.5° C.) under stirring, and the heating rate was kept at 2.5° C. / m...

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Abstract

The invention relates to a method for producing titanium dioxide, belonging to the field of chemical industry. The invention solves the technical problem of providing a method for producing titanium dioxide with even particle size distribution. The method does not need to prepare crystal seed titanium liquid additionally. The method for producing titanium dioxide comprises the following steps of:a. preheating deionized water to 94 to 98 DEG C, adding hydrolysis titanium liquid with the temperature of 90 to 98 DEG C, and mixing evenly; b. raising the temperature to boiling, then keeping microboiling, stopping heating after the solution is changed to be grey, and cooling so as to avoid new crystal nucleus from forming again at the moment; c. heating again to boiling, then keeping microboiling till the hydrolysis is ended and obtaining a hydrolysis material; d. carrying out acid pickling, bleaching, washing, salt treatment, calcining and crushing to the hydrolysis material and obtainingthe titanium dioxide. The method for producing titanium dioxide does not need to prepare crystal seed or crystal seed titanium liquid additionally, simplifies the production technique, and saves the production cost; the produced titanium dioxide has uniform particle size, narrow particle size distribution and good pigment performance; and the method provides a new selection for the preparation ofthe titanium dioxide of the field.

Description

technical field [0001] The invention relates to a method for producing titanium dioxide and belongs to the field of chemical industry. Background technique [0002] At present, titanium dioxide manufacturers mainly use the sulfuric acid method titanium dioxide production process for production. The sulfuric acid method titanium dioxide production process is divided into: self-generated seed crystal atmospheric pressure thermal hydrolysis process and external seed crystal atmospheric pressure thermal hydrolysis process. Since the external seed crystal atmospheric pressure thermal hydrolysis process needs to prepare additional seed crystals, the process steps are complicated. Therefore, most enterprises use the self-generated seed crystal atmospheric pressure thermal hydrolysis process to produce titanium dioxide. [0003] The main steps of the self-generated seed crystal atmospheric pressure thermal hydrolysis process are: firstly add the hydrolyzed titanium solution to deion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
Inventor 田从学胡鸿飞陈新红马维平罗志强唐勇杜剑桥
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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