Method of hydrothermal preparation of high-purity titanium dioxide from industrial metatitanic acid

A technology of titanium dioxide and metatitanic acid, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of many hidden dangers in production safety, high quality requirements for raw materials, and high prices for auxiliary materials, and achieve new varieties, low prices, and reduced production costs. Small colloid characteristics and the effect of specific surface area

Active Publication Date: 2019-10-22
攀枝花兴中钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The titanium alkoxide hydrolysis method has less "three wastes", good product quality, and good process repeatability, but the process is long, there are many hidden safety hazards in production, and the price of auxiliary materials is high, so it is only suitable for laboratory preparation
The direct hydrolysis of titanium tetrachloride has a short process flow and good product quality, but requires high quality raw materials and high production costs
[0006] At present, the use of industrial metatitanic acid to prepare high-purity titanium dioxide cannot obtain a purity of more than 99.8%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Using the industrial metatitanic acid in the traditional sulfuric acid titanium dioxide production process as raw material, add water to disperse the industrial metatitanic acid, heat to 70°C and then filter, then wash with 70°C water until there is no ferrous iron in the washing liquid after washing Ions exist to obtain the preliminary purified metatitanic acid filter cake; after preliminary washing, the preliminary purified metatitanic acid filter cake is diluted with water and stirred for beating and dispersed to regulate the slurry concentration of metatitanic acid 200g / L (with TiO 2 Mass meter), placed in a high-pressure reactor for hydrothermal crystallization reaction, the hydrothermal crystallization temperature is 140°C, and the hydrothermal crystallization time is 24h. After the hydrothermal crystallization reaction, cool to 70°C, wash with 70°C deionized water while it is hot, and use hydrogen peroxide solution and ammonium thiocyanate solution to detect the p...

Embodiment 2

[0055] Using industrial metatitanic acid in the traditional sulfuric acid titanium dioxide production process as raw material, add water to disperse industrial metatitanic acid, heat to 70°C and then filter, then wash with 70°C water until there is no ferrous ion in the washing liquid after washing Exist, obtain the metatitanic acid filter cake of preliminary purification; After preliminary washing, dilute the metatitanic acid filter cake of preliminary purification with water and stir beating and disperse, regulate and control the slurry concentration 280g / L of metatitanic acid (with TiO 2 Mass meter), placed in a high-pressure reactor for hydrothermal crystallization reaction, the hydrothermal crystallization temperature is 180°C, and the hydrothermal crystallization time is 36h. After the hydrothermal crystallization reaction, cool to 80°C, wash with 60°C deionized water while it is hot, and use hydrogen peroxide solution and ammonium thiocyanate solution to detect the prese...

Embodiment 3

[0057] Using industrial metatitanic acid in the traditional sulfuric acid titanium dioxide production process as raw material, add water to disperse industrial metatitanic acid, heat to 70°C and then filter, then wash with 70°C water until there is no ferrous ion in the washing liquid after washing Exist, obtain the metatitanic acid filter cake of preliminary purification; After preliminary washing, dilute the metatitanic acid filter cake of preliminary purification with water and stir beating and disperse, regulate and control the slurry concentration 130g / L of metatitanic acid (with TiO 2 Mass meter), placed in a high-pressure reactor for hydrothermal crystallization reaction, the hydrothermal crystallization temperature is 120°C, and the hydrothermal crystallization time is 48h. After the hydrothermal crystallization reaction, cool to 80°C, wash with 70°C deionized water while it is hot, and use hydrogen peroxide solution and ammonium thiocyanate solution to detect the prese...

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Abstract

The invention relates to a method of hydrothermal preparation of high-purity titanium dioxide from industrial metatitanic acid and belongs to the field of titanium dioxide preparation. The method of the hydrothermal preparation of high-purity titanium dioxide from industrial metatitanic acid comprises the following steps of: dispersing industrial metatitanic acid with water, performing filtrationand washing till no ferrous ion is present in washing liquid, performing dispersion with the water again to form pulp with a concentration of 100-300g / L calculated according to mass of titanium dioxide, performing hydrothermal crystallization on the pulp at 110-180 DEG C for 24-48h, then cooling to 60-80 DEG C, performing filtration and washing till no ferrous ion is present in washing liquid to form a metatitanic acid filter cake, calcining the metatitanic acid filter cake, increasing a temperature from a room temperature to 840-900 DEG C at a heating rate of 10-15 DEG C / min, holding the temperature for 60-300min, then cooling to the room temperature, and performing crushing and grinding to form high-purity titanium dioxide. According to the method of preparing titanium dioxide from industrial metatitanic acid, the purity is above 99.8%.

Description

technical field [0001] The invention relates to a method for hydrothermally preparing high-purity titanium dioxide with industrial metatitanic acid, and belongs to the field of titanium dioxide preparation. Background technique [0002] Due to its unique physical and chemical properties and excellent optical properties, titanium dioxide, as the third largest inorganic chemical in the world, is widely used in many fields such as coatings, plastics, papermaking, and rubber. At the same time, because titanium dioxide has high dielectric constant and resistivity, and has semiconductor characteristics, it becomes the basic raw material for preparing other high-performance materials, such as catalyst carriers, ultraviolet absorbers, special glasses, electronic ceramics, thermistors, Semiconductor capacitors, strontium titanate varistors, functionalized titanium dioxide and titanium metal are widely used in fields, and the demand has increased year by year in recent years. In rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
CPCC01G23/047C01P2004/62C01P2006/80
Inventor 田从学
Owner 攀枝花兴中钛业有限公司
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