Hydrolyzing method for preparing titanium white

A technology of titanium dioxide and titanium seed crystal liquid, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of wide particle size distribution and uneven particle size, and achieve a narrow particle size distribution, uniform dispersion, and uniform composition Effect

Inactive Publication Date: 2008-10-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to study a hydrolysis technology for preparing titanium dioxide products with a narrow particle size distribution on the basis of the existing self-generated seed crystal hydrolysis technology at atmospheric pressure, so as to overcome the wide particle size distribution of the product in the prior art, and the particles are not Uniform and other defects

Method used

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  • Hydrolyzing method for preparing titanium white
  • Hydrolyzing method for preparing titanium white
  • Hydrolyzing method for preparing titanium white

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First heat the deionized water as the bottom water to boiling, then add the deionized water with a volume of 100ml in the boiling state into the hydrolysis pot, stir and maintain a slight boiling state. Take 5ml of seed crystal titanium solution and add it to the above boiling bottom water to form a hydrolysis system. The pH value of the system is 2.5. Keep the system slightly boiling, and carry out the first aging for 5min under stirring. As the aging progresses, the colloidal Ti(OH) 4 first converted to TiO 2+ ions, followed by thermal hydrolysis to generate stable and uniform TiO(OH) 2 Seed crystals, to avoid some of the seeds cannot make TiO due to high acidity 2+ Converted to TiO(OH) 2 , leading to the defect that the number of seed crystals is insufficient. Add 500ml of hydrolyzed titanium solution preheated to 90°C with a concentration of 200g / l into the hydrolysis pot at a constant speed within 15 minutes. During the addition, the temperature of the system w...

Embodiment 2

[0028] First heat the deionized water as the bottom water to boiling, then add the deionized water with a boiling volume of 125ml into the hydrolysis pot, stir and maintain a slight boiling state. Take 10ml of seed crystal titanium solution and add it into the boiling bottom water to form a hydrolysis system. The pH value of the system is 2.2. Keep the system slightly boiling, and carry out the first aging for 10 minutes under stirring. As aging proceeds, colloidal titanium hydroxide first transforms into TiO 2+ ions, followed by thermal hydrolysis to generate stable and uniform TiO(OH) 2 Seed crystals, to avoid some of the seeds cannot make TiO due to high acidity 2+ Converted to TiO(OH) 2 , leading to the defect that the number of seed crystals is insufficient. Add 500ml of titanium hydrolysis solution preheated to 93°C with a concentration of 220g / l into the hydrolysis pot at a constant speed within 18 minutes. During the addition, the temperature of the system was main...

Embodiment 3

[0031] First heat the deionized water as the bottom water to boiling, then add the deionized water with a boiling volume of 150ml into the hydrolysis pot, stir and maintain a slight boiling state. Take 15ml of seed crystal titanium solution and add it into the boiling bottom water to form a hydrolysis system. The pH value of the system is 2.0. Keep the system slightly boiling, and carry out the first aging for 15 minutes under stirring. As aging proceeds, colloidal titanium hydroxide first transforms into TiO 2+ ions, followed by thermal hydrolysis to generate stable and uniform TiO(OH) 2 Seed crystals, to avoid some of the seeds cannot make TiO due to high acidity 2+ Converted to TiO(OH) 2 , leading to the defect that the number of seed crystals is insufficient. Add 500ml of hydrolyzed titanium solution preheated to 98°C with a concentration of 240g / l into the hydrolysis pot at a constant speed within 20min. During the addition, the temperature of the system was maintaine...

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Abstract

The invention relates to a hydrolyzation method for preparing titanium white and aims to solve the problem with prior art of the wide distribution of the grain diameters of the titanium white. The method is characterized in that the seed crystal titanium liquid and the hydrolyzing liquid are added step by step and the autogenetic seed crystals are matured step by step, so that the stability, uniformity and dispersivity in the titanium are better. By the method, the titanium white product with controllable and narrow distribution of grain diameters can be obtained. The technical proposal adopted is that: the paint-grade titanium white product with the half peak breadth of 80 to 100nm can be obtained by controlling the reaction conditions and the technical parameters such as the method of adding the titanium liquid, the quantity of bottom water, the quantity of seed crystals, the time for maturing the seed crystals, the feeding speed, the concentration of the titanium liquid, etc. Furthermore, the method needs no further production equipment. Therefore. Compared with prior industrial hydrolyzing technology, the method has the advantages of strong adaptability, high product quality, etc.

Description

technical field [0001] The invention relates to a hydrolysis method for preparing titanium dioxide, in particular to a method for preparing titanium dioxide with narrow particle size distribution in the production process of producing titanium dioxide by sulfuric acid method. Background technique [0002] One of the key processes affecting the quality of sulfuric acid titanium dioxide is hydrolysis, and the formation of seed crystals is the key to hydrolysis. The number and composition of the seed crystals determine the composition of the hydrolyzed metatitanic acid, as well as the quality of the final product. [0003] At present, the normal-pressure hydrolysis technology of spontaneous seed crystals is widely used in China, that is, the hydrolysis method in which hot concentrated titanium liquid under normal pressure is added to hot bottom water at a certain speed. Although the adoption of this technology has greatly improved the quality of my country's titanium dioxide p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 杜剑桥罗建林税必刚唐勇朱科孟长春程晓哲
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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