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A kind of titanium dioxide primary product and preparation method thereof

A technology of titanium dioxide and metatitanic acid, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of uneven quality of titanium dioxide first product, poor quality index of titanium dioxide first product, and no clear standard for calcination process. , to achieve the effect of good pigment performance, stable whiteness and stable achromatic power

Active Publication Date: 2019-04-09
CHONGQING TITANIUM IND OF PANGANG GROUP
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  • Summary
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  • Description
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Problems solved by technology

[0004] However, in the prior art, there is no clear standard for the calcination process of the primary product of titanium dioxide, and the quality of the primary product of titanium dioxide prepared is also uneven, with low rutile content, low decolorization power and whiteness and instability, so that titanium The quality index of the primary white powder is poor

Method used

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  • A kind of titanium dioxide primary product and preparation method thereof
  • A kind of titanium dioxide primary product and preparation method thereof

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preparation example Construction

[0029] The invention provides a kind of preparation method of titanium dioxide primary product, comprises the following steps:

[0030] a) Suction filtration after mixing metatitanic acid, titanium dioxide sol and salt solution, to obtain a raw material mixture filter cake;

[0031] b) calcining the raw material mixture filter cake obtained in step a) to obtain the primary product of titanium dioxide;

[0032] The calcination process specifically includes: dehydrating, desulfurizing, crystal transformation and grain growth of the filter cake of the raw material mixture in sequence to obtain the primary product of titanium dioxide.

[0033] In the invention, firstly, the metatitanic acid, titanium dioxide sol and salt solution are mixed and then suction-filtered to obtain a raw material mixture filter cake. In the present invention, there is no special limitation on the source of the metatitanic acid, and commercially available or self-made products well known to those skilled...

Embodiment 1

[0051] (1) to 10L TiO 2 135g of titanium dioxide sol, 1.5mL of sodium phosphate solution, 12.5mL of potassium carbonate solution and 40mL of zinc chloride solution were sequentially added to the metatitanic acid with a content of 300g / L, stirred evenly, and then subjected to suction filtration to obtain a raw material mixture filter cake.

[0052] (2) Put the raw material mixture filter cake obtained in step (1) into a muffle furnace for calcination according to the following process and program temperature: ① Dehydration: uniformly rise from room temperature to 320 ° C within 60 minutes, and keep it warm for 1 hour; ② Desulfurization : Uniformly raise the temperature to 780°C within 60min and keep it for 1.5h; ③Crystal transformation and grain growth: uniformly raise the temperature to 850°C within 60min and keep it for 1.5h; get the primary product of titanium dioxide.

[0053] After the primary product of titanium dioxide obtained in Example 1 of the present invention was g...

Embodiment 2

[0062] (1) to 10L TiO 2 156g of titanium dioxide sol, 1.8mL of sodium phosphate solution, 15mL of potassium carbonate solution and 36mL of zinc chloride solution were sequentially added to the metatitanic acid with a content of 300g / L, stirred evenly, and then subjected to suction filtration to obtain a raw material mixture filter cake.

[0063] (2) Put the raw material mixture filter cake obtained in step (1) into a muffle furnace for calcination according to the following process and program temperature: ① Dehydration: uniformly rise from room temperature to 320 ° C within 60 minutes, and keep it warm for 1 hour; ② Desulfurization : Uniformly raise the temperature to 720°C within 60min, and keep it warm for 2h; ③Crystal transformation and grain growth: Uniformly raise the temperature to 820°C within 60min, keep warm for 1.5h; obtain the primary product of titanium dioxide.

[0064] After the primary product of titanium dioxide obtained in Example 2 of the present invention w...

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Abstract

The invention provides a titanium dioxide primary product and a preparation method thereof. The preparation method comprises the following steps: (a) mixing metatitanic acid, titanium dioxide sol and a salt solution, and performing suction filtration to obtain a raw material mixture filter cake; and (b) calcining the raw material mixture filter cake obtained in the step (a) to obtain the titanium dioxide powder primary product. The calcining process particularly comprises the steps of sequentially performing dehydration, desulfuration, crystal type transformation and crystal growth on the raw material mixture filter cake to obtain the titanium dioxide powder. Compared with the prior art, the preparation method of the titanium dioxide primary product has the advantages that metatitanic acid and seed crystals are mixed in the salt solution, the calcining process is controlled to obtain the titanium dioxide primary product with high quality index; and the titanium dioxide primary product is high in content of rutile, high and stable in lightening power and whiteness, and good in pigment performance. Experimental results show that the titanium dioxide primary product obtained by the preparation method has the content of rutile of 97.8% or above, the whiteness of not lower than 96.45, the Tcs value of not less than 1958 and the Scx value of not less than 3.67.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide production, and more specifically, relates to a primary product of titanium dioxide and a preparation method thereof. Background technique [0002] As the most important inorganic pigment, the primary product of titanium dioxide is widely used in various fields such as coatings, papermaking, plastics, rubber, and inks. At present, the industrial large-scale production of primary titanium dioxide is mainly sulfuric acid method and chlorination method. Although the chlorination method is generally more advanced than the sulfuric acid method, due to technical limitations, the sulfuric acid method is mainly used in China. [0003] In the sulfuric acid process, the metatitanic acid calcination process is one of the key processes that determine the quality of the primary product of titanium dioxide. The quality of calcination has a great influence on the quality of the primary product of titan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047
CPCC01G23/047C01G23/08C01P2006/65C01P2006/80
Inventor 喻晖廖荣华景建林曹磊赵北东冯燕刘佳
Owner CHONGQING TITANIUM IND OF PANGANG GROUP
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