Preparation method of weather-resistant titanium dioxide

A technology of titanium dioxide and weather resistance, applied in the field of pigments, can solve problems such as poor weather resistance, and achieve the effect of improving product whiteness and weather resistance

Inactive Publication Date: 2014-01-08
湖南永利化工股份有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention provides a preparation method of titanium dioxide with good weather resistance in order to solve the technical problem of poor weather resistance of existing sulfuric acid process titanium dioxide

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  • Preparation method of weather-resistant titanium dioxide

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[0022] The invention provides a preparation method of weather-resistant titanium dioxide, the method comprising the following steps:

[0023] S1. The mineral is subjected to acid hydrolysis, sedimentation and filtration, crystallization to remove green vitriol, and concentration to obtain a concentrated titanium solution, which is then hydrolyzed and washed once with water to obtain a washed metatitanic acid slurry;

[0024] S2, bleaching the first-washed metatitanic acid slurry;

[0025] S3, washing the bleached metatitanic acid twice;

[0026] S4. Doping the metatitanic acid treated in step S3, the doping method is to add phosphorus compound, magnesium compound, antimony compound, aluminum compound, lithium compound, potassium compound to the metatitanic acid after secondary water washing in sequence aqueous solution, mixed uniformly;

[0027] S5, filtering and dehydrating the doped metatitanic acid, and then calcining to obtain crude titanium dioxide;

[0028] S6, pulver...

Embodiment 1

[0058] TiO 2 Put 400ml of once-washed metatitanic acid with a content of 280g / L in a 500ml beaker, add 10ml of 93% sulfuric acid under electric stirring, and add the acid for 15 minutes. After adding the acid, heat it with an electric furnace to keep the temperature of the slurry at 60°C. After reaching the above temperature, add Ti to the above metatitanic acid 3+ Concentration (as TiO 2 Total) is 3ml of 60 g / L trivalent titanium solution, the feeding time is 10min, and the Ti 3+ Then continue to stir for 20 minutes, stop stirring, and let it stand for aging for 1.0 hours.

[0059] Take 350ml of the above-mentioned bleached metatitanic acid, and vacuum filter it with a Buchner funnel. When about 1 / 3 of the solid surface is exposed, wash with 1000ml of deionized water with a temperature of 48°C, a pH value of 1.5, and a resistivity of 560Ω*m, then suck and dry to obtain a filter cake, and then use an appropriate amount of deionized water Mix with water to make slurry metati...

Embodiment 2

[0064] TiO 2 Put 400ml of once-washed metatitanic acid with a content of 300g / L in a 500ml beaker, add 10ml of 98% sulfuric acid under electric stirring, and add the acid for 15 minutes. After adding the acid, heat it with an electric furnace to keep the temperature of the slurry at 65°C. After reaching the above temperature, add Ti to the above metatitanic acid 3+ Concentration (as TiO 2 Total) is 5ml of 60 g / L trivalent titanium solution, the feeding time is 15min, and the Ti 3+ Then continue to stir for 20 minutes, stop stirring, and let it stand for aging for 1.0 hours.

[0065] Take 350ml of the above-mentioned bleached metatitanic acid, and vacuum filter it with a Buchner funnel. When about 1 / 3 of the solid surface is exposed, wash with 1000ml of deionized water with a temperature of 45°C and a resistivity of 500Ω*m to adjust the pH value to 1.0, then suction filter and dry to obtain a filter cake, and then use an appropriate amount of deionized water mixed with wat...

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Abstract

The invention provides a preparation method of weather-resistant titanium dioxide. The method includes doping metatitanic acid subjected to bleaching and secondary washing. The doping method includes sequentially adding water solution of phosphorus compound, magnesium compound, stibium compound, aluminum compound, lithium compound and potassium compound, and well mixing. By the method, iron content in the titanium dioxide is lowered, the prepared titanium dioxide is good in each quality index, and photocatalytic activity is lowered greatly.

Description

technical field [0001] The invention belongs to the field of pigments, in particular to a preparation method of weather-resistant titanium dioxide. Background technique [0002] As the king of white pigments, titanium dioxide pigments are widely used in coatings, plastics, papermaking, chemical fibers, inks and other fields. The purpose of various applications is to use the hiding power and scattering power of the pigment to make the product opaque and improve the appearance gloss and weather resistance of the product. [0003] At present, in the production process of sulfuric acid titanium dioxide, because the control of bleaching and washing process conditions is not very effective, the content of harmful impurities such as iron elements in titanium dioxide is relatively high, and the iron content (measured as Fe / TiO 2 Total) generally above 0.005%. Most of these variable-valence metal elements will increase the photocatalytic activity of the pigment and reduce the white...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08C09C1/36C09C3/06C09C3/08C09C3/12
Inventor 陈建华李实秾刘重人段海婷候清麟戴建军彭祥燕李恩明张先鹏
Owner 湖南永利化工股份有限公司
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