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Recycling method of denitration catalyst waste and denitration catalyst prepared from denitration catalyst waste

A technology of denitration catalyst and recovery method, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalyst, etc. Use problems such as low efficiency to achieve the effects of low wear rate, strong pressure resistance, and reduced production costs

Inactive Publication Date: 2011-05-11
CHONGQING YUANDA CATALYST MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still no effective method to reduce the amount of titanium and tungsten powder, which makes the cost of denitrification catalyst high.
In addition, denitrification catalyst waste (that is, unqualified denitration catalyst products or intermediate products produced in the production process) contains vanadium and other substances that are harmful to the body and the environment. Discarding a large amount of waste is an indirect damage to public interests.
If the waste is recycled directly, there are the following problems: the conventional calcination in the waste recycling process will increase its surface hydrogen bonds, and its crystal form and surface physical properties will change, especially in the process of mixing titanium and tungsten powders. Under the action of the mixture, it is easier to agglomerate in granular form, resulting in uneven distribution and low utilization efficiency of recycled materials

Method used

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  • Recycling method of denitration catalyst waste and denitration catalyst prepared from denitration catalyst waste
  • Recycling method of denitration catalyst waste and denitration catalyst prepared from denitration catalyst waste
  • Recycling method of denitration catalyst waste and denitration catalyst prepared from denitration catalyst waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] - Preparation of denitrification catalyst recycle material

[0023] The denitrification catalyst waste is calcined at 700°C for 20 hours, and ground into 40-150um powder to obtain the denitrification catalyst recycle material.

[0024] Preparation of double denitrification catalyst

[0025] 60 parts of titanium dioxide; 3 parts of tungsten trioxide; 45 parts of denitrification catalyst reclaimed material; 1 part of vanadium pentoxide; 2 parts of glass fiber; 0.5 parts of citric acid solution with a mass percentage of 50%; 1 part of carboxymethyl cellulose; 3 parts of rare earth oxides are kneaded, extruded, dried, and calcined to obtain a denitrification catalyst recovery material composition, and its specification is 150×150×500mm 3 , 18 holes × 18 holes.

[0026] Three performance parameters detection

[0027] Tested by nitrogen adsorption method and specific surface area tester, the specific surface area of ​​the denitrification catalyst prepared in this ex...

Embodiment 2

[0034] - Preparation of denitrification catalyst recycle material

[0035] The denitrification catalyst waste is calcined at 500°C for 10 hours, and ground into 150-250um powder to obtain the denitrification catalyst recycle material.

[0036] Preparation of double denitrification catalyst

[0037] 90 parts of titanium dioxide; 10 parts of tungsten trioxide; 1 part of denitration catalyst reclaimed material; 2 parts of vanadium pentoxide; 6 parts of glass fiber; 2 parts of citric acid solution with a mass percentage of 48%; , extrusion, drying, calcining, cutting and module assembly to obtain a denitrification catalyst recovery material composition, the specification of which is 150×150×900mm 3 , 18 holes × 18 holes.

[0038] Three performance parameters detection

[0039] Tested by nitrogen adsorption method and specific surface area tester, the specific surface area of ​​the denitrification catalyst prepared in this embodiment is 58㎡ / g; the void volume measured by ...

Embodiment 3

[0046] - Preparation of denitrification catalyst recycle material

[0047] The denitrification catalyst waste is calcined at 600° C. for 10 hours, and ground into a powder with a particle size of 150-250 μm to obtain a denitrification catalyst recycle material.

[0048] Preparation of double denitrification catalyst

[0049] 80 parts of titanium dioxide; 7 parts of tungsten trioxide; 30 parts of denitration catalyst reclaimed material; 1.5 parts of vanadium pentoxide; 4 parts of glass fiber; 1.2 parts of citric acid solution with a mass percentage of 52%; 4.8 parts of rare earth oxides are kneaded, extruded, dried, and calcined to obtain a denitrification catalyst recovery material composition, and its specification is 150×150×1500mm 3 , 18 holes × 18 holes.

[0050] Three performance parameters detection

[0051] Detected by nitrogen adsorption method and specific surface area tester, the specific surface area of ​​the denitrification catalyst prepared in this embod...

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Abstract

The invention relates to the field of denitration catalyst, in particular to a recycling method of denitration catalyst waste. The recycling method comprises the following concrete steps: calcining unqualified denitration catalyst or denitration catalyst waste at the temperature of 500-700 DEG C for 10-20 hours; and grinding the calcined product into powder with particle size of 40-350 microns to obtain the recycled material of denitration catalyst. A method for preparing the denitration catalyst from the denitration catalyst waste comprises the steps of mixing, extruding, drying and calcining titanium dioxide, tungsten trioxide, denitration recycled material, vanadium pentoxide, glass fiber, citric acid solution and rare earth oxide by a conventional method. By adopting the recycling method, the operation is simple, and the production cost can be obviously lowered; the product prepared from the recycled material has the advantages of large specific area, large pore volume, strong compressive resistance and low wear rate; the catalyst is environment-friendly; and the waste is turned into wealth.

Description

technical field [0001] The invention relates to the field of denitration catalysts, in particular to a method for recovering waste materials of denitration catalysts and a denitration catalyst prepared therefrom. Background technique [0002] The impact of nitrogen oxides on environmental pollution is getting worse and worse, and it is becoming more and more urgent to strictly control NOx emissions from thermal power plants. The core of controlling NOx emissions (that is, denitrification) is the catalyst. my country is about to usher in a peak period of denitrification, and the low cost of catalyst manufacturing has also become a need for social development. Titanium and tungsten as the catalyst carrier are the key raw materials for the production of vanadium-tungsten-titanium system catalysts with titanium and tungsten as the catalyst carrier, accounting for 80-90% of the total weight of the catalyst and more than 60% of the total cost of the catalyst. However, there is st...

Claims

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Application Information

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IPC IPC(8): B01J37/00B01J37/08B01J23/30B01D53/86B01D53/56
Inventor 樊永生刘红辉席文昌周林刘显彬李云涛魏丽斯洪燕曾庆袁鹏刘伟成丹陈付国邓巧莲张河坤王刚
Owner CHONGQING YUANDA CATALYST MFG
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