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Preparation method of nanometer titanium dioxide

A technology of nano-titanium dioxide and metatitanic acid, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems that restrict the development of denitrification environmental protection industry, the catalyst is not acclimatized, and the coal quality is uneven, so as to promote the industry Upgrading, broadening the industrial chain, and less environmental pollution

Inactive Publication Date: 2012-11-07
CHONGQING PUYUAN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the nano-titanium dioxide used to prepare denitrification catalysts is imported from abroad, which not only wastes a lot of foreign exchange but also seriously restricts the development of denitrification and environmental protection industries.
At the same time, due to the constraints of many objective factors such as resource characteristics and contradictions between supply and demand, the quality of coal used in domestic coal-fired power stations is uneven, resulting in flue gas conditions such as NOx, SO 2 , ash content and other indicators are also relatively harsh, and the catalyst prepared by using imported nano-titanium dioxide appears "acclimatized" phenomenon

Method used

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  • Preparation method of nanometer titanium dioxide

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Experimental program
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Effect test

Embodiment 1

[0025] Weigh 25kg metatitanic acid (equivalent to TiO 2 In total, the raw material TiO 2 The content is about 28%), placed in a reactor equipped with a stirrer, and about 223kg of deionized water was added to make the slurry TiO 2 The content is about 8%, stir for 0.5h; add ammonia water to the slurry to adjust the pH value to 6, heat the slurry to 70°C with steam, keep warm and stir for 2.0h, and at the same time add an appropriate amount of ammonia water to maintain the pH of the slurry at 6; Add 0.125kg of ammonium citrate to the mixture and stir for 1 hour; press filter the slurry to a block filter cake with a solid content of about 40%; calcinate the filter cake for 2 hours at 150°C, 2 hours at 250°C, 2 hours at 350°C, 480°C Calcined at ℃ for 3 hours; the calcined solid was pulverized by a powder mill to a particle size D50 of 1.22um to obtain a nano-titanium dioxide product.

Embodiment 2

[0027] Weigh 25kg metatitanic acid (equivalent to TiO 2 In total, the raw material TiO 2 The content is about 28%), put it in a reaction kettle equipped with a stirrer, add about 223kg deionized water to make the slurry TiO2 content about 8%, stir for 0.8h; add ammonia water to the slurry to adjust the pH value to 7, use steam Heat the slurry to 70°C, keep warm and stir for 2.5 hours, and at the same time add an appropriate amount of ammonia water to maintain the pH of the slurry at 7; add 0.125kg of ammonium citrate to the slurry and stir for 1 hour; press filter the slurry until the solid content is about 50% Block filter cake; calcining the filter cake, including calcination at 180°C for 2 hours, calcination at 300°C for 2 hours, calcination at 400°C for 2 hours, and calcination at 490°C for 3 hours; the calcined solid was pulverized by a powder machine until the particle size D50 was 1.15um to obtain nano Titanium dioxide products.

Embodiment 3

[0029] Weigh 25kg metatitanic acid (equivalent to TiO 2 In total, the raw material TiO 2 The content is about 28%), put it in a reactor equipped with a stirrer, add about 188kg deionized water to make the slurry TiO2 content about 9%, stir for 1h; add ammonium carbonate to the slurry to a pH value of 7, and use steam to Heat the slurry to 75°C, keep it warm and stir for 2.5 hours, and at the same time add an appropriate amount of ammonium carbonate to maintain the pH of the slurry at 7; add 0.125kg of pentadecylsulfanthamine to the slurry, and stir for 1 hour; press filter the slurry until the solid content is about It is a 45% block filter cake; the filter cake is calcined at 150°C for 2h, at 300°C for 2h, at 390°C for 2h, and at 520°C for 3h; the calcined solid is pulverized by a powder machine until the particle size D50 is 1.38 um, to obtain nano-titanium dioxide products.

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Abstract

The invention provides a preparation method of nanometer titanium dioxide, and relates to the preparation field of inorganic chemical materials. In the method, metatitanic acid intermediate from titanium dioxide preparation by a sulfur acid process is used as a raw material, and nanometer titanium dioxide is prepared through technical processes of pulping, dispersing, filter pressing, calcining and crushing. Compared with a prior art, the preparation method provided by the invention has the beneficial effects as follows: a selective catalytic reduction (SCR) denitration catalyst made of nanometer titanium dioxide provided by the invention is more applicable to coal characteristics and smoke conditions of domestic coal-fired power plants, beneficial to controlling the production of various raw materials in catalyst production companies and effectively reducing the production cost of the catalyst; and the catalyst made of the product provided by the invention is better adapted to smoke characteristics of the domestic coal-fired power plants and achieves higher denitration efficiency.

Description

technical field [0001] The invention relates to a method for preparing inorganic chemical materials, in particular to a method for preparing nanometer titanium dioxide. Background technique [0002] Nitrogen oxide (NOx) is one of the main air pollutants and an important precursor for inducing photochemical smog and acid rain. It is imperative to establish a low-carbon and environment-friendly economic development mode. Among them, flue gas from coal-fired power stations and industrial boilers is the largest source of NOx, accounting for about 60% of the total NOx emissions. The draft of the national "Twelfth Five-Year Plan" clearly listed NOx emissions as a binding indicator. ) has more stringent requirements on the implementation time of thermal power plant denitrification and NOx emission standards, and clearly requires that the nitrogen oxide emission of new and existing thermal power plants be controlled at 100mg / Nm 3 within. Therefore, the denitrification catalyst ma...

Claims

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Application Information

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IPC IPC(8): C01G23/047B82Y30/00
Inventor 曾凡阳邱赟梁功伟徐鸿巫星蓉陈晓民秦剑锋鲁谦怀廖红艳
Owner CHONGQING PUYUAN CHEM IND
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