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Recovery method of waste SCR (Selective Catalytic Reduction) catalyst, recovery cleaning fluid and catalyst prepared from recovered catalyst

An SCR catalyst and catalyst technology, applied in the field of denitration catalyst, can solve the problem of high recovery cost, and achieve the effects of reducing production cost, simple operation and reducing emissions

Inactive Publication Date: 2014-08-06
CHENGDU DONGFANG KWH ENVIRONMENTAL PROTECTION CATALYSTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For catalysts that cannot be regenerated, they use waste catalysts to extract precious metals, such as titanium, tungsten, vanadium, etc., but the recovery cost of this method is relatively high
At present, there is no unit in China that specializes in the recycling of waste SCR honeycomb catalysts, and the recycling of waste SCR honeycomb catalysts is still a new field in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Preparation of waste denitrification catalyst recycled materials

[0020] The waste SCR honeycomb catalyst is crushed into small pieces of 30 mm in size by a crusher, and a large amount of coal ash is removed by a vibrating screen, and then put into an ultrasonic cleaner and added with 0.5% isomeric C13 fatty alcohol polyoxyethylene ether emulsifier, Shake the cleaning solution composed of 0.01% hydrofluoric acid aqueous solution for 1 hour, then take it out and clean it with clean water, put it in a drying oven and dry it at 100°C for 10 hours, grind it into a powder with a particle size of about 50um, and obtain the waste denitrification catalyst recycled material.

[0021] 2. Preparation of denitrification catalyst

[0022] Mix 80 parts of titanium dioxide, 3 parts of tungsten trioxide, 5 parts of waste denitrification catalyst recycled material, 1 part of vanadium pentoxide, 5 parts of glass fiber and appropriate amount of deionized water to obtain the denitratio...

Embodiment 2

[0032] 1. Preparation of waste denitrification catalyst recycled materials

[0033] The waste SCR honeycomb catalyst is broken into small pieces of 40 mm in size by a crusher, and a large amount of coal ash is removed by a vibrating screen, and then put into an ultrasonic cleaner to add 1.5% isomeric C13 fatty alcohol polyoxyethylene ether emulsifier, Shake the cleaning solution composed of 0.02% hydrofluoric acid aqueous solution for 1 hour, then take it out and clean it with clean water, put it in a drying oven and dry it at 100°C for 10 hours, grind it into a powder with a particle size of about 30um, and obtain the waste denitrification catalyst recycled material.

[0034] 2. Preparation of denitrification catalyst

[0035] Mix 65 parts of titanium dioxide, 5 parts of tungsten trioxide, 15 parts of waste denitrification catalyst recycled material, 1.5 parts of vanadium pentoxide, 5 parts of glass fiber and appropriate amount of deionized water to obtain the denitration cat...

Embodiment 3

[0044] 1. Preparation of waste denitrification catalyst recycled materials

[0045] Preparation of waste denitrification catalyst recycled materials: The waste SCR honeycomb catalyst is broken into small pieces with a size of 50mm by a crusher, and then a large amount of coal ash is removed through a vibrating screen, and then put into an ultrasonic cleaner to add 3% isomeric C13 fat Alcohol polyoxyethylene ether emulsifier, a cleaning solution composed of 0.03% hydrofluoric acid aqueous solution, shake for 1 hour, then take it out and clean it with water, put it in a drying oven and dry it at 100°C for 10 hours, and grind it into a powder with a particle size of about 100um. The recycled material of the waste denitration catalyst is obtained.

[0046] 2. Preparation of denitrification catalyst

[0047] Mix 50 parts of titanium dioxide, 8 parts of tungsten trioxide, 30 parts of waste denitrification catalyst recycled material, 2 parts of vanadium pentoxide, 12 parts of glass ...

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Abstract

The invention discloses a recovery method of a waste SCR (Selective Catalytic Reduction) catalyst, recovery cleaning fluid and a catalyst prepared from the recovered catalyst. Effective cleaning for a waste honeycomb type SCR catalyst is realized with cleaning fluid prepared from an isomeric C13 fatty alcohol-polyoxyethylene ether emulsifier and hydrofluoric acid and by an ultrasonic cleaning method; the waste honeycomb type SCR catalyst is crushed, cleaned and ground, and is mixed with titanium dioxide, tungsten trioxide, glass fibers and vanadium pentoxide, so that the waste SCR catalyst incapable of working continuously becomes a material for producing a fresh catalyst and is recycled. The method is easy to operate, the production cost can be obviously reduced, the emission of pollutants is reduced, and the performance of the product prepared from the waste catalyst recovery material is the same as that of a new product. The product has an environment-friendly effect, and recycling of the waste catalyst is realized.

Description

technical field [0001] The invention relates to the technical field of preparation of denitration catalysts, in particular to a method for recovering waste SCR honeycomb catalysts and a denitration catalyst prepared therefrom. Background technique [0002] With the development of the emerging industry of domestic denitrification SCR catalysts and the release of new national standards for nitrogenous emissions, the demand for SCR catalysts has increased rapidly. After a period of operation, the honeycomb SCR catalyst will be deactivated or its structure will be destroyed, so it can no longer be used, which will generate a large amount of spent catalyst waiting for disposal. [0003] Represented by Japan, the United States, Germany, the United Kingdom, Eastern Europe and Western Europe, the catalytic treatment of waste SCR in foreign countries generally adopts the method of regeneration and recycling first. For catalysts that cannot be regenerated, they use waste catalysts to...

Claims

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Application Information

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IPC IPC(8): B01J38/60B01J23/30
Inventor 崔文伟艾生炳梁材罗永新王平万宏平李用廖新
Owner CHENGDU DONGFANG KWH ENVIRONMENTAL PROTECTION CATALYSTS
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