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Preparation method of high specific surface area titanium dioxide for denitration catalyst

A technology of high specific surface area and denitration catalyst is applied in the field of preparation of titanium dioxide with high specific surface area for denitration catalyst, which can solve the problems of high cost and complicated process, and achieve the effects of large specific surface area, increased specific surface area and low burning amount

Inactive Publication Date: 2017-02-08
NANJING TITANIUM DIOXIDE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the methods in the prior art are obtained in the range of 200m 2 / g, and the process is complicated and the cost is high, therefore, there is an urgent need for a new solution to solve this technical problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of high specific surface area titanium dioxide for denitration catalyst, described method is as follows:

[0022] 1) Preheat the concentrated titanium solution to 80°C, add 3.5% hydrolysis seeds, keep the pressure at 0.1MPa, and hydrolyze to obtain metatitanic acid.

[0023] 2) The metatitanic acid obtained in step 1) is firstly washed, bleached, and secondly washed, and the qualified metatitanic acid is beaten, and the concentration (calculated as titanium dioxide) is controlled at 200g / l.

[0024] 3) Add ammonia water to the metatitanic acid slurry obtained in step 2) under stirring, and adjust the pH value of the slurry to 6.8.

[0025] 4) After maturing the slurry obtained in step 3) for 30 minutes, it was filtered through a vacuum filtration device and washed with water, and the solid content of the filter cake was 36%.

[0026] 5) Put the filter cake obtained in step 4) into an electric oven for drying, the temperature is controlled a...

Embodiment 2

[0030] A kind of preparation method of high specific surface area titanium dioxide for denitration catalyst, described method is as follows:

[0031] 1) Preheat the concentrated titanium solution to 85°C, add 5% hydrolysis seeds, keep the pressure at 0.1MPa, and hydrolyze to obtain metatitanic acid;

[0032] 2) The metatitanic acid obtained in step 1) is firstly washed, bleached, and secondly washed, and the qualified metatitanic acid is beaten, and the concentration (calculated as titanium dioxide) is controlled at 180g / l;

[0033] 3) Add ammonia water to the metatitanic acid slurry obtained in step 2) under stirring, and adjust the pH value of the slurry to 7.0;

[0034] 4) After maturing the slurry obtained in step 3) for 40 minutes, filter and wash with water through a vacuum filtration device, and the solid content of the filter cake is 39%;

[0035] 5) Put the filter cake obtained in step 4) into an electric oven for drying, the temperature is controlled at 130°C, and t...

Embodiment 3

[0038] A kind of preparation method of high specific surface area titanium dioxide for denitration catalyst, described method is as follows:

[0039] 1) Preheat the concentrated titanium solution to 90°C, add 4% hydrolysis seeds, keep the pressure at 0.2MPa, and hydrolyze to obtain metatitanic acid;

[0040] 2) The metatitanic acid obtained in step 3) is firstly washed, bleached, and secondly washed, and the qualified metatitanic acid is beaten, and the concentration (calculated as titanium dioxide) is controlled at 190g / l.

[0041] 3) Add ammonia water to the metatitanic acid slurry obtained in step 2) under stirring, and adjust the pH value of the slurry to 7.2.

[0042] 4) After aging the slurry obtained in step 3) for 35 minutes, it was filtered through a vacuum filtration device and washed with water, and the solid content of the filter cake was 36%.

[0043] 5) Put the filter cake obtained in step 4) into an electric oven for drying, the temperature is controlled at 110...

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Abstract

The invention relates to a preparation method of high specific surface area titanium dioxide for a denitration catalyst. The preparation method comprises the following steps: (1) taking concentrated titanium liquid in the sulfuric acid method titanium dioxide production process as the raw material, adding a seed crystal, and carrying out pressurized hydrolysis to obtain meta-titanic acid with a high specific surface area; (2) washing the obtained meta-titanic acid for the first time, bleaching the meta-titanic acid, washing the meta-titanic acid for a second time, beating qualified meta-titanic acid after water washing, and controlling the concentration (calculated by titanium dioxide) to be in a range of 120 to 200 g / L; (3) adding an alkaline substance into the meta-titanic acid slurry obtained in the step (2) under stirring so as to adjust the pH value of the slurry to a range of 6.5 to 7.5; (4) subjecting the slurry obtained in the step (3) to aging, which lasts for 30 to 60 minutes, carrying out suction filtration in a vacuum suction device, and washing the filter cake by water, wherein the solid content of filter cake is more than 35%; (5) placing the filter cake obtained in the step (4) in an electric oven to dry the filter cake, wherein the temperature is controlled in a range of 105 to 150 DEG C, and the drying time lasts for 10 to 20 hours; and (6) grinding the material obtained in the step (5) by a high speed grinding machine to obtain the high specific surface area titanium dioxide.

Description

technical field [0001] The invention relates to a treatment method, in particular to a method for preparing titanium dioxide with a high specific surface area for a denitration catalyst, and belongs to the technical field of titanium dioxide production. Background technique [0002] Titanium dioxide is considered to be a white pigment with the best performance in the world. The main component of titanium dioxide is TiO 2 , The chemical properties are stable, and it does not react with most substances under normal circumstances. There are three kinds of crystals of titanium dioxide in nature: brookite, anatase and rutile, brookite is an unstable crystal form with no industrial value, anatase is referred to as type A, and rutile is referred to as Type R, all of which have stable crystal lattices, are important white pigments and porcelain glazes. Compared with other white pigments, they have superior whiteness, tinting power, hiding power, weather resistance, heat resistance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01J21/06
CPCC01G23/053B01J21/063C01P2006/12B01J35/615
Inventor 王唯诚高岭杜茂平顾勇陈琪王园
Owner NANJING TITANIUM DIOXIDE CHEM
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