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Method for recycling waste SCR (selective catalytic reduction) denitration catalyst

A technology for denitrification waste catalysts and denitrification catalysts, applied in chemical instruments and methods, catalyst regeneration/reactivation, physical/chemical process catalysts, etc., can solve the problems of cumbersome treatment process, high industrialization cost, poor separation effect, etc. Simple, low cost, resource saving effect

Inactive Publication Date: 2018-12-28
江苏中研创星材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are some existing methods for recycling spent SCR denitrification catalysts. Although these methods can realize recycling of SCR denitrification waste catalysts, they have the following disadvantages: they need to consume a large amount of acid, and the separation effect is poor and the product yield is low; gases such as SO 2 Gas, etc.; the treatment process is relatively cumbersome, and the industrialization cost is also high

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  • Method for recycling waste SCR (selective catalytic reduction) denitration catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Clean the spent SCR catalyst with compressed air and then with deionized water to remove heavy metals, fly ash and soluble substances adsorbed on the surface of the spent catalyst. Washing and cleaning are carried out alternately, each time for 0.5h. ;

[0022] (2) Put the spent catalyst obtained in step 1 and the hydrochloric acid solution with a concentration of 5% into the ultrasonic container at a volume ratio of 1:2, immerse the spent catalyst in the hydrochloric acid solution, raise the temperature to 35°C, and clean it by ultrasonic wave for 2.0 hours leaching;

[0023] (3) Add potassium chloride with a mass percentage of 2.0% to the leachate obtained in step 2, oxidize the tetravalent vanadium in the leachate to pentavalent vanadium, and adjust the pH value to 7 with a concentration of 2% sodium hydroxide solution , to obtain a metavanadate solution, then add ammonium chloride with a mass percentage of 1.5% to the metavanadate solution to obtain an ammoniu...

Embodiment 2

[0029] (1) Clean the spent SCR catalyst with compressed air and then with deionized water to remove heavy metals, fly ash and soluble substances adsorbed on the surface of the spent catalyst. Washing and cleaning are carried out alternately, each time 0.7h. ;

[0030] (2) Put the spent catalyst obtained in step 1 and the hydrochloric acid solution with a concentration of 10% into the ultrasonic container according to the volume ratio of 1:2, immerse the spent catalyst in the hydrochloric acid solution, raise the temperature to 40°C, and clean it by ultrasonic wave for 1.5h leaching;

[0031] (3) Add 1.5% potassium chloride to the leaching solution obtained in step 2 to oxidize the tetravalent vanadium in the leaching solution to pentavalent vanadium, and adjust the pH value to 8 with a 2% sodium hydroxide solution , to obtain a metavanadate solution, then add ammonium chloride with a mass percentage of 2.5% to the metavanadate solution to obtain an ammonium metavanadate solu...

Embodiment 3

[0037] (1) Clean the spent SCR catalyst with compressed air and then with deionized water to remove heavy metals, fly ash and soluble substances adsorbed on the surface of the spent catalyst. Washing and cleaning are carried out alternately, each 0.8h. ;

[0038] (2) Add the spent catalyst obtained in step 1 and the hydrochloric acid solution with a concentration of 10% into the ultrasonic container at a volume ratio of 1:2, immerse the spent catalyst in the hydrochloric acid solution, raise the temperature to 50°C, and clean it by ultrasonic waves for 1.8 hours. leaching;

[0039] (3) Add 1.8% potassium chloride to the leaching solution obtained in step 2 to oxidize the tetravalent vanadium in the leaching solution to pentavalent vanadium, and adjust the pH value to 7 with a 2% sodium hydroxide solution , to obtain a metavanadate solution, then add ammonium chloride with a mass percentage of 3.0% to the metavanadate solution to obtain an ammonium metavanadate solution, prec...

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Abstract

The invention provides a method for recycling a waste SCR (selective catalytic reduction) denitration catalyst. The method comprises steps as follows: the waste catalyst is blow-washed by compressed air and then cleaned by deionized water; the waste catalyst and a hydrochloric acid solution are added to an ultrasonic container and subjected to ultrasonic cleaning and leaching in sequence; potassium chloride is added to a leaching agent, pH value is regulated by a sodium hydroxide solution, a metavanadate solution is obtained, ammonium chloride is added, an ammonium metavanadate solution is obtained, precipitated, washed and filtered, and ammonium metavanadate is obtained; ammonium metavanadate, ammonium metatungstate, a penetration enhancer, a cosolvent and deionized water are mixed, pH value is regulated by hydrochloric acid, and a regenerated impregnating solution is obtained; the waste catalyst is put in the regenerated impregnating solution for impregnation; the impregnated waste catalyst is dried; the dried catalyst is calcined, and a regenerated catalyst is obtained. With the adoption of the washing, ultrasonic acid cleaning and impregnating regeneration technologies, the method has the advantages of simple process, low cost and good cleaning effect and facilitates realization of industrialization.

Description

technical field [0001] The invention relates to waste catalyst regeneration and recovery technology, in particular to a method for recycling and utilization of SCR denitrification waste catalyst. Background technique [0002] SCR (selective catalytic reduction) denitrification technology is the most widely used and mature denitrification process in the world. Because of its high denitrification efficiency, strong adaptability, and high reliability, it has been widely used. The core part of the SCR denitrification system is the catalyst. During the operation, due to poisoning, sintering, aging, wear, blockage and other reasons, the denitrification catalyst will fail. Although the catalyst can be regenerated to restore activity, the regeneration is not unlimited. With the widespread application of the SCR process, the amount of catalyst used has also doubled, and there are more and more waste catalysts. [0003] At present, the mechanical life of SCR denitration catalysts so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/92B01J23/22B01J38/60B01J38/64B01J38/48B01J38/02
CPCB01J23/22B01J23/92B01J38/02B01J38/485B01J38/60B01J38/64
Inventor 孟令军
Owner 江苏中研创星材料科技有限公司