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A kind of technological method of adjusting and controlling particle size of titanium dioxide

A process method, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve problems such as poor particle size control

Active Publication Date: 2021-01-01
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problem that the particle size of titanium dioxide particles is not well controlled during the calcination process of titanium dioxide pointed out in the background technology, the present invention provides a method for regulating the particle size of titanium dioxide. The temperature rise rate in the calcination process can regulate the residence time of particles in different temperature ranges, and adjust the chemical reaction, phase transition and crystal growth rate in the process by regulating the heat supplied to the calcination process, so as to achieve the regularization of titanium dioxide products. Particle size, improve the performance of pigments, and increase the rate of high-quality products

Method used

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  • A kind of technological method of adjusting and controlling particle size of titanium dioxide
  • A kind of technological method of adjusting and controlling particle size of titanium dioxide
  • A kind of technological method of adjusting and controlling particle size of titanium dioxide

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Experimental program
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Embodiment 1

[0037] 1.1. Obtaining the experimental raw material metatitanic acid:

[0038] Using the hydrolyzed slurry in the traditional sulfuric acid method titanium dioxide production process as raw material, wash with deionized water at 60°C after suction filtration, and filter; according to the method of metatitanic acid slurry TiO 2 Concentration of 300g / L was metered into deionized beating, and stirred in a constant temperature water bath at 70°C for 30 minutes; / L concentration of industrial Ti 3+ The content of Ti in the solution, calcined seed crystal and slurry is expressed as TiO 2 Calculated 4.0% calcined seed crystals need to be stirred for 30 minutes after each feeding; then the slurry is suction-filtered and washed with deionized water at 60°C for a second time and filtered; the filter cake is put into an oven and baked at 120°C 6h, the experimental raw material metatitanic acid was obtained.

[0039] 1.2. Non-segmented calcination of metatitanic acid

[0040] Take an ...

Embodiment 2

[0043] 2.1. Obtaining the experimental raw material metatitanic acid:

[0044] Using the hydrolyzed slurry in the traditional sulfuric acid method titanium dioxide production process as raw material, wash with deionized water at 60°C after suction filtration, and filter; according to the method of metatitanic acid slurry TiO 2 Concentration of 300g / L was metered into deionized beating, and stirred in a constant temperature water bath at 70°C for 30 minutes; / L concentration of industrial Ti 3+ The content of Ti in the solution, calcined seed crystal and slurry is expressed as TiO 2 The calculated 4.0% calcined seed crystals need to be stirred for 30 minutes after each feeding; then the slurry is suction-filtered and washed with 60°C deionized water for the second time and filtered; the second-washed filter cake is beaten and dispersed with deionized water, and added with TiO 2 The calculated mass fraction is 0.2% soluble phosphorus salt reagent (in P 2 o 5 ), the mass fra...

Embodiment 3

[0053] Using the hydrolyzed slurry in the traditional sulfuric acid titanium dioxide production process as raw material, the hydrolyzed slurry is suction-filtered and washed once with deionized water at 60°C to clean the industrial waste acid in the slurry to obtain a metatitanic acid filter cake ; After preliminary washing, disperse the metatitanic acid filter cake with deionized beating, adjust the TiO2 concentration of the metatitanic acid slurry to about 300g / L, place it in a constant temperature water bath at 70°C and stir for 30min; then add 100g / L 98% Concentrated sulfuric acid, stirred for 30min; take industrial Ti 3+ Solution and Calcined Seed, Ti 3+ The amount of addition is about 1.3g / L in the first washing slurry, stir for 30 minutes, and then add TiO to the slurry according to the Ti content in the slurry 2 The calculated mass fraction was 4.0% calcined seed crystals, stirred for 30 min, and the bleached slurry was suction-filtered and washed twice with deionized...

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Abstract

The invention relates to a technological method for regulating and controlling the particle size of titanium dioxide. The particle size of titanium dioxide is regulated and controlled by changing thecalcination heating rate. The method specifically comprises the following steps that in the calcining step of preparing titanium dioxide, a mode of controlling the heating rate to perform segmented calcining is adopted, the calcining process is divided into three temperature sections for segmented calcining, in the first section, the temperature is 25-800 DEG C, the adopted heating rate is 5-10 K / min, and the residence time is 155-77 min; in the second stage, the temperature ranges from 800 DEG C to 950 DEG C, the adopted heating rate ranges from 0.5 K / min to 1.5 K / min, and the standing time ranges from 300 min to 100 min; and in the third stage, the temperature is 950-1000 DEG C, the adopted heating rate is 5-7 K / min, and the retention time is 10-7 min. By means of the method, the particle size range of TiO2 can be finally regulated and controlled to be 240 nm to 260 nm. According to the method, the crystal transformation and the crystal growth rate of TiO2 are adjusted by controllingthe heating rates of different stages of calcination and changing the residence time of particles in different temperature sections, so that the purpose of regulating the particle size of titanium dioxide is achieved, and the method has guiding significance for actual industrial production.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide production, and in particular relates to a calcining process method for regulating the particle size of titanium dioxide. Background technique [0002] Titanium dioxide is recognized as a high-performance white pigment in the world. It has significant advantages such as large hiding power, high decolorizing power, and good weather resistance. It also has stable physical and chemical properties and superior electro-optical properties. The technological process of domestic industrial production of titanium dioxide is mainly the sulfuric acid method. In the sulfuric acid process, the calcination process of metatitanic acid is the process of forming titanium dioxide. After calcination, the crystal form, particle size and distribution of the kiln bottom material directly affect the pigment performance of the finished titanium dioxide, which is a very important quality evaluation index for tita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/08
CPCC01G23/08C01P2002/72C01P2004/03C01P2004/62
Inventor 陈葵周晓葵王子楠林发蓉张玉荣严旭辉熊怀忠杜国华
Owner EAST CHINA UNIV OF SCI & TECH