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Method for recovering tungsten component from selective catalytic reduction denitrification catalyst

A denitration catalyst and selective technology, applied in the direction of improving process efficiency, can solve problems such as non-regeneration, limited number of catalyst regenerations, and environmental pollution.

Inactive Publication Date: 2013-05-08
JIANGSU LONGYUAN CATALYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be pointed out that the performance and life of the regenerated catalyst will be significantly reduced, and the number of regenerations of the catalyst is limited. The catalyst whose mechanical life has expired will not be regenerated, and will eventually become a waste catalyst.
Because it contains toxic substances such as vanadium pentoxide and tungsten trioxide, if it is not treated, it will seriously pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for recovering tungsten components from a selective catalytic reduction denitration catalyst, comprising the following process steps:

[0022] (1) Washing and grinding: the waste catalyst is washed with water or weak alkali solution to remove surface dust and particle impurities, dried at 80°C and ground to 100 mesh;

[0023] (2) Calcination: Take the ground waste catalyst obtained in step (1), and calcinate it at 650°C for 2 hours to remove organic matter and fully oxidize it, and then mix it with sodium carbonate at a mass ratio of waste catalyst:sodium carbonate 10:1 , ground to 200 mesh and then calcined at 650°C for 6h;

[0024] (3) Extraction: take the waste catalyst burned in step (2) and immerse it in water, stir it at room temperature for 3 hours, filter, and extract the filtrate with the extract, the extract is N235, the volume ratio of extract: 2-octanol: kerosene is 1: 2:7 mixed and prepared and then used to extract the volume of the liquid to be e...

Embodiment 2

[0027] A method for recovering tungsten components from a selective catalytic reduction denitration catalyst, comprising the following process steps:

[0028] (1) Washing and grinding: the waste catalyst is washed with water or weak alkali solution to remove surface dust and particle impurities, dried at 120°C and ground to 200 mesh;

[0029] (2) Calcination: Take the ground waste catalyst obtained in step (1), and calcinate it at 750°C for 5 hours to remove organic matter and fully oxidize it, and then mix it with sodium carbonate in a mass ratio of waste catalyst:sodium carbonate 5:1 , ground to 300 mesh and then calcined at 700°C for 10h;

[0030] (3) Extraction: Take the waste catalyst burned in step (2) and immerse it in water, stir it at room temperature for 6 hours, filter it, and extract the filtrate with the extract. The volume ratio of the extract: 2-octanol: kerosene is 2: 1:7 mixed and prepared; then used to extract the volume of the liquid to be extracted, the vo...

Embodiment 3

[0033] A method for recovering tungsten components from a selective catalytic reduction denitration catalyst, comprising the following process steps:

[0034] (1) Rinse and grind: Rinse the waste catalyst with water or weak alkali solution to remove surface dust and particle impurities, dry at 100°C and grind to 150 mesh;

[0035] (2) Calcination: Take the ground waste catalyst obtained in step (1), and calcinate it at 700°C for 4 hours to remove organic matter and fully oxidize it, and then mix it with sodium carbonate in a mass ratio of waste catalyst:sodium carbonate 8:1 , ground to 250 mesh and then calcined at 700°C for 8h;

[0036] (3) Extraction: Take the waste catalyst after burning in step (2) and immerse it in water, stir it at room temperature for 4 hours, filter it, and extract the filtrate with the extract. 1.5:7 mixed and prepared; then used to extract the volume of the liquid to be extracted, with a volume fraction of 22% and a mass concentration of 30% ammonia...

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PUM

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Abstract

The invention relates to a method for recovering a tungsten component from a selective catalytic reduction denitrification catalyst, belonging to the technical field of waste catalyst recovery. The invention achieves the purpose of separating and purifying a tungsten component by high-temperature sodium salt roasting, organic phase extraction, ammonia water back extraction and other operations. According to the invention, tungsten trioxide in a catalyst can be separated from other acidic metal oxide, the contained tungsten element can be selectively extracted, no effect can be made on the recovery of other metal elements, and the recovery of the tungsten component can be realized basically.

Description

technical field [0001] The invention relates to a method for recovering tungsten components from a selective catalytic reduction denitration catalyst, and belongs to the technical field of waste catalyst recovery. Background technique [0002] The pollution of nitrogen oxides is becoming more and more serious, and coal-fired power plants are the largest source of air pollution in the country. During the "Twelfth Five-Year Plan" period of the country, the control of nitrogen oxide emissions has been intensified, and the denitrification of flue gas requires the use of selective catalytic reduction (SCR) technology to achieve emission standards. SCR is the mainstream denitrification technology at home and abroad, accounting for more than 90% of the flue gas market, and is the most mature flue gas denitrification technology. The basic principle of SCR is that under the action of metal oxides, liquid ammonia or urea is used as a reducing agent, and the flue gas temperature at th...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/36
CPCY02P10/20
Inventor 汪德志吴刚肖雨亭赵建新
Owner JIANGSU LONGYUAN CATALYST CO LTD
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