Method for recycling wasted SCR denitrification catalyst

A technology of SCR catalyst and denitrification catalyst, which is applied in the recycling field of waste SCR denitrification catalyst, can solve the problems of poor catalyst strength and wear resistance, short service life, failure of recovery, etc., and achieves simple operation, strong wear resistance, and reduced reuse cost effect

Inactive Publication Date: 2015-05-20
北京宏庚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during ultrasonic cleaning, due to the low strength of the spent catalyst, it is easy to disperse in the cleaning solution to form a paste, which makes the recovery fail; moreover, less recycled materials are used in the preparation of new catalysts, and only glass is added during the preparation process. Fiber is used as a reinforcing agent, which tends to make the prepared catalyst poor in strength and wear resistance, and has a short service life
[0005] In short, the above problems indicate that the existing waste SCR denitrification catalyst recycling technology needs to be improved to simplify the treatment process, reduce costs, prevent secondary pollution to the environment, and adapt it to the needs of large-scale industrial production

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1. Preparation of recycled waste denitrification catalyst

[0029] (1) the spent SCR catalyst is cleaned of surface dust with a vacuum device, and then the spent catalyst is cut into small pieces of 30 cm in length by a cutting machine;

[0030] (2) Put the cut catalyst into the cleaning solution, bubble and clean it for 20 minutes, take it out and rinse it with clean water;

[0031] (3) Put the cleaned catalyst into a drying oven and dry it at 120° C. for 3 hours;

[0032] (4) Using a pulverizer to pulverize the catalyst into 300-mesh particles to obtain the waste denitration catalyst recycle material.

[0033] 2. Preparation of denitrification catalyst

[0034] (1) ammonium molybdate is dissolved in the hot water of 60 ℃ and is mixed with the solution A that mass fraction is 20%;

[0035] (2) Ammonium metavanadate, oxalic acid and water are configured into solution B in a mass ratio of 1:2:5;

[0036] (3) 20 parts of solution A, 16 parts of solution B, 80 parts of...

Embodiment 2

[0039] 1. Preparation of recycled waste denitrification catalyst

[0040] (1) the spent SCR catalyst is cleaned of surface dust with a vacuum device, and then the spent catalyst is cut into small pieces with a length of 20 cm by a cutting machine;

[0041] (2) Put the cut catalyst into the cleaning solution, bubble and clean it for 10 minutes, take it out and rinse it with clean water;

[0042] (3) Put the cleaned catalyst into a drying oven, and dry it at 100° C. for 2 hours;

[0043] (4) Using a pulverizer to pulverize the catalyst into 100-mesh particles to obtain the waste denitration catalyst recycle material.

[0044] 2. Preparation of denitrification catalyst

[0045] (1) ammonium molybdate is dissolved in the hot water of 60 ℃ and is mixed with the solution A that mass fraction is 20%;

[0046] (2) Ammonium metavanadate, oxalic acid and water are configured into solution B in a mass ratio of 1:2:5;

[0047] (3) 10 parts of solution A, 8 parts of solution B, 70 part...

Embodiment 3

[0050] 1. Preparation of recycled waste denitrification catalyst

[0051] (1) the waste SCR catalyst is cleaned of surface dust with a vacuum device, and then the waste catalyst is cut into small pieces with a length of 50 cm by a cutting machine;

[0052] (2) Put the cut catalyst into the cleaning solution, bubble and clean it for 30 minutes, take it out and rinse it with clean water;

[0053] (3) Put the cleaned catalyst into a drying oven, and dry it at 150° C. for 4 hours;

[0054] (4) Using a pulverizer to pulverize the catalyst into 200-mesh particles to obtain the waste denitration catalyst recycle material.

[0055] 2. Preparation of denitrification catalyst

[0056] (1) ammonium molybdate is dissolved in the hot water of 60 ℃ and is mixed with the solution A that mass fraction is 20%;

[0057] (2) Ammonium metavanadate, oxalic acid and water are configured into solution B in a mass ratio of 1:2:5;

[0058] (3) 25 parts of solution A, 16 parts of solution B, 90 par...

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Abstract

The invention discloses a method for recycling a wasted SCR denitrification catalyst. The method comprises the following steps of effectively cleaning a wasted SCR catalyst by a cleaning solution prepared from a microporous penetrating agent JFC-1, peregal O and acetic acid by adopting a bubble cleaning method; and cutting the wasted SCR catalyst, cleaning, drying, crushing, mixing the crushed wasted SCR catalyst with ammonium molybdate, ammonium metavanadate, oxalic acid, glass fibers, hydroxypropyl methyl cellulose, polyethylene glycol-400 and water, and re-preparing a plate-type denitrification catalyst. The method provided by the invention is simple and convenient to operate, low in cost, and free of secondary pollution to the environment in the recycling process; in addition, the plate type catalyst prepared from the recycled material is high in activity, intensity and abrasion resistance, has the certain sulfur poisoning resistant capability, and recycles the waste SCR denitrification catalyst well.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a method for recycling a waste SCR denitrification catalyst. technical background [0002] my country promulgated the "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011) in July 2011, which put forward strict requirements on the flue gas emissions of thermal power plants, and the Selective Catalytic Reduction (SCR) flue gas denitration technology has been obtained widely used. The most critical part of this technology is the denitrification catalyst. According to the installation time and service life prediction of the denitrification catalyst, my country will begin to produce a large amount of waste flue gas denitrification catalyst around 2016. After 2018, the waste catalyst production will reach 250,000-300,000 m 3 / year (approximately 130,000-150,000 tons / year). [0003] Due to the generally poor quality of domestic denitrification ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/96B01D53/56
Inventor 王朋代永强洪挺侯娜娜薛焱
Owner 北京宏庚环保科技有限公司
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