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Preparation method of high-whiteness light-resistance rutile type titanium dioxide substrate

A titanium dioxide and rutile-type technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of increasing the production cost of titanium dioxide, not being able to improve light resistance, and limited commercial value, so as to eliminate the problem of yellow phase and improve whiteness , the effective effect of the method

Active Publication Date: 2015-08-19
XIANGYANG LOMON TITANIUM IND CO LTD
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Problems solved by technology

The disadvantage of this method is that a large amount of phosphoric acid needs to be added to the system, which not only causes a waste of resources, but also increases the production cost of titanium dioxide, and the commercial value is limited.
[0006] Another example is that Chinese invention patents CN101857736A and CN102585559A disclose the use of adding zirconium compounds, silicon compounds and aluminum compounds to titanium dioxide slurry to improve the light resistance of titanium dioxide. These patents improve the whiteness and brightness of titanium dioxide by coating means Light resistance, but the use of a variety of compound coatings cannot substantially improve the light resistance in essence, we should consider improving the light resistance and whiteness of the titanium dioxide substrate in essence

Method used

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  • Preparation method of high-whiteness light-resistance rutile type titanium dioxide substrate

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preparation example Construction

[0030] The preparation method of the high whiteness and light fastness rutile titanium dioxide base material of the present invention comprises the following steps:

[0031] (1) Preparation of metatitanic acid: acidolysis of ilmenite and sulfuric acid to obtain titanyl sulfate, which is then precipitated, crystallized, and hydrolyzed to generate metatitanic acid;

[0032] (2) One-time water washing of metatitanic acid: Wash metatitanic acid with deionized water at a temperature of 50-80°C to remove metal impurities;

[0033] (3) Preparation of metatitanic acid slurry: add water to the washed metatitanic acid to make a slurry, and the concentration of the slurry is 300-350g / L;

[0034] (4) Bleaching metatitanic acid slurry: add sulfuric acid to the metatitanic acid slurry to make the sulfuric acid concentration of the slurry 60-90g / L, and add 5wt% calcined rutile titanium dioxide seeds to the slurry at the same time and 0.2wt% Ti 3+ solution, the weight percent metering basis...

Embodiment 1

[0040] (1) Preparation of metatitanic acid slurry: take the washed metatitanic acid, add enough deionized water, and prepare the slurry with a total mass of 2000g, TiO 2 Content is 25% metatitanic acid slurry;

[0041] (2) Bleaching of metatitanic acid: Slowly add 90g of concentrated sulfuric acid and stir, then heat the system to 60°C in a water bath;

[0042] (3) Add 5.0% calcined seed crystals, that is, add 238.1g calcined seed crystals with a mass fraction of 10.5%, stir for 30min and add 14g Ti with a mass fraction of 5.15% 3+ solution, then continue to stir for 90min;

[0043] (4) Wash the bleached metatitanic acid with deionized water at a temperature of 50-80°C, and then make a pulp to make a 300g / L metatitanic acid slurry and conduct quantitative analysis on the slurry, and the ferrous ion content is less than 20ppm ;

[0044] (5) 7.80g of KOH with a mass fraction of 17.31% (after adding KOH 2 O mass fraction is 0.27%), 4.20g mass fraction is 23.86% H 3 PO 4 (Af...

Embodiment 2

[0047] (1) Preparation of metatitanic acid slurry: take the washed metatitanic acid, add enough deionized water, and prepare a metatitanic acid slurry with a total mass of 2000g and a TiO2 content of 25%;

[0048] (2) Bleaching of metatitanic acid: Slowly add 90g of concentrated sulfuric acid and stir, then heat the system to 60°C in a water bath;

[0049] (3) Add 5.0% calcined seed crystals, that is, add 238.1g calcined seed crystals with a mass fraction of 10.5%, stir for 30min and add 14g Ti with a mass fraction of 5.15% 3+ solution, then continue to stir for 90min;

[0050] (4) Wash the bleached metatitanic acid with deionized water at a temperature of 50-80°C, and then make a pulp to make a 300g / L metatitanic acid slurry and conduct quantitative analysis on the slurry, and the ferrous ion content is less than 20ppm ;

[0051] (5) 7.80g of KOH with a mass fraction of 17.31% (after adding KOH 2 O mass fraction is 0.27%), 4.20g mass fraction is 23.86% H 3 PO 4 (After ad...

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Abstract

The invention discloses a preparation method of high-whiteness light-resistance rutile type titanium dioxide substrate. The preparation method includes steps of primary washing of metatitanic acid, preparation of metatitanic acid sizing, bleaching of metatitanic acid sizing, secondary washing of metatitanic acid, salt treating, roasting and smashing. In the bleaching of metatitanic acid sizing, 5wt% of rutile titanium dioxide roasted seed crystal and 0.2wt% of Ti3 and solution are added into the sizing. In the step of salt treating, potassium compound, phosphorous compound, aluminum compound and stibium oxide are added into the secondarily-washed metatitanic acid. By adding aluminum salt content, aluminum salt enters crystal lattice during growth of titanium dioxide crystal, light resistance performance of titanium dioxide pigment is substantially improved, and the yellowish problem caused by increment of aluminum slat content can be eliminated by adding antimonic salt, so that whiteness of dry powder is kept, whiteness and light resistance are kept balanced, and the high-whiteness light-resistance rutile type titanium dioxide substrate.

Description

technical field [0001] The invention relates to a preparation method of a high-whiteness light-fastness rutile titanium dioxide base material, and belongs to the technical field of titanium dioxide pigment application. Background technique [0002] Titanium dioxide, commonly known as titanium dioxide, has the advantages of high whiteness, opacity, and excellent physical and chemical properties, and is widely used in the fields of plastics, coatings, inks, and papermaking. The field of pigments is one of the main application fields of titanium dioxide, and the field of decorative paper production has higher requirements for the light resistance and whiteness of titanium dioxide. [0003] The production of decorative paper adopts thermocompression forming process. During the preparation process, titanium dioxide and fibers are impregnated with thermosetting resin, and then thermocompressed to obtain the finished product. The laminated paper obtained by this process has the ch...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 詹迎青周春勇熊怀忠孙润发朱全芳
Owner XIANGYANG LOMON TITANIUM IND CO LTD
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