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Preparation method of rutile titanium dioxide with stable lattice

A rutile-type titanium dioxide, stable technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high cost, influence of pigment performance, high calcination temperature, and achieve the effect of stable lattice and good weather resistance

Inactive Publication Date: 2011-03-16
JIANGSU TAIBAI GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing manufacturers stabilize the crystal lattice of titanium dioxide by increasing the amount of zinc salt added to the salt treatment method, thereby improving weather resistance, but the calcined product is easy to sinter, and the performance of the pigment will be greatly affected, and the zinc salt is expensive and the cost is high
Aluminum salt treatment is also used to improve weather resistance. There are domestic reports on aluminum salt treatment, such as patent No. CN1559913A, which discloses: a crystal phase control agent through potassium, phosphorus, and aluminum, which coordinates the decolorization power and conversion rate of crystal phase transformation. And the contradictory relationship between whiteness, but the high calcination temperature of aluminum salt treatment will not only affect the performance of the product, but also high energy consumption

Method used

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  • Preparation method of rutile titanium dioxide with stable lattice
  • Preparation method of rutile titanium dioxide with stable lattice

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using the same hydrolysis of metatitanic acid as in Comparative Example 1, the metatitanic acid was washed with water, bleached, added with rutile crystal seeds, and rinsed to control the amount of Fe in metatitanic acid after washing. 2 o 3 The content is less than 30ppm, adding TiO in metatitanic acid 2 Amount of 0.45% KOH (with K20 meter), 0.02% H 3 PO 4 (in P 2 o 5 meter), 0.2% Al 2 (SO 4 ) 3 (in Al 2 o 3 Calculated), the treated metatitanic acid is pumped into a filter cake under vacuum, calcined at a temperature of 980° C. until the rutile conversion rate reaches above 99%, cooled, ground and pulverized with a three-head mill for 40 minutes to obtain the required titanium dioxide.

Embodiment 2

[0021] Prepare the crystal nucleus by comparative example 1, the crystal nucleus is pressed 3.0% (with TiO 2 Add the amount of titanium sulfate solution to be hydrolyzed, heat and hydrolyze it to generate metatitanic acid, the stirring speed in the hydrolysis process is 50rpm, wash the metatitanic acid with water, bleach, add rutile crystal seed, rinse, control the partial titanate after washing Fe in acid 2 o 3 The content is less than 30ppm, adding TiO in metatitanic acid 2 Amount of 0.48% KOH (in K 2 O), 0.02% H 3 PO 4 (in P 2 o 5 meter), 0.35% Al 2 (SO 4 ) 3 (in Al 2 o 3 Calculated), the treated metatitanic acid is pumped into a filter cake under vacuum, calcined at a temperature of 940° C. until the rutile conversion rate reaches above 99%, cooled, ground and pulverized with a three-head mill for 40 minutes to obtain the required titanium dioxide.

Embodiment 3

[0023] Prepare the crystal nucleus as above, the crystal nucleus is pressed 3.5% (with TiO 2 Add the amount of titanium sulfate solution to be hydrolyzed, heat and hydrolyze it to generate metatitanic acid, the stirring speed in the hydrolysis process is 50rpm, wash the metatitanic acid with water, bleach, add rutile crystal seed, rinse, control the partial titanate after washing Fe in acid 2 o 3 The content is less than 30ppm, add to the metatitanic acid TiO2 Amount of 0.48% KOH (in K 2 O), 0.02% H 3 PO 4 (in P 2 o 5 total), 0.40% of A12 (SO 4 ) 3 (in Al 2 o 3 Calculated), the treated metatitanic acid is pumped into a filter cake under vacuum, calcined at a temperature of 930°C until the rutile conversion rate reaches more than 99%, cooled, ground and pulverized with a three-head mill for 40 minutes to obtain the required titanium dioxide.

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Abstract

The invention relates to a preparation method of rutile titanium dioxide with stable lattice, belonging to the manufacturing technology of chemical industry product. The method comprises the following steps of: a, using 200g / L of titanium sulfate solution for the preparation of hydrolyzed seed crystals; b, adding 2.1 to 6.5% of the prepared seed crystals with homogeneous crystal nucleus by weight of TiO2 into the titanium sulfate solution for being heated and hydrolyzed, and preparing hydrolyzed metatitanic acid under the stirring speed of 30 to 70rpm; c, water rinsing and bleaching the hydrolyzed metatitanic acid, adding rutile calcining seed crystals and then bleaching, controlling the content of Fe2O3 to be less than 30ppm, and then adding 0.45 to 0.52% of KOH, 0.02 to 0.05% of H3PO4 and 0.20 to 0.55% of Al2(SO4)3 by weight of TiO2 in the metatitanic acid for treatment; and d. evacuating the treated metatitanic acid into filter cake under vacuum, and calcining at 900 to 980 DEG C, cooling and crushing the filter cake to obtain the rutile titanium dioxide. The rutile titanium dioxide production prepared according to the method of the invention has good pigment performance and stable rutile lattice.

Description

technical field [0001] The invention belongs to the manufacturing technology of chemical products, and relates to a method for preparing rutile titanium dioxide with stable crystal lattice. Background technique [0002] Titanium dioxide is widely used in coatings, paints, papermaking, plastics, electrical appliances and many other industries. In many fields, when titanium dioxide is used as a white pigment, because TiO2 absorbs ultraviolet rays to cause photochemical activity, most of the ultraviolet rays absorbed by the coating film are absorbed by TiO2. Only a small part is absorbed by the base material. After TiO2 absorbs ultraviolet rays, it excites electrons and leaves positively charged holes in the lattice. The excited electrons and holes may be recombined in the lattice , may also dissociate to the surface of the lattice, resulting in the degradation of the colored material. [0003] In order to reduce the photochemical activity of TiO2, especially the outdoor rutil...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 王俊秋蒯开明陈俊潘巧珍
Owner JIANGSU TAIBAI GROUP
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