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A method for recycling waste SCR denitration catalyst and regenerating SCR denitration catalyst carrier powder

A denitrification catalyst and carrier technology, which is applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high equipment investment cost, high input cost, loss, etc.

Active Publication Date: 2021-05-18
CHONGQING YUANDA CATALYST MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This route has the following disadvantages: First, the process is lengthy, the operation is complicated, and the input cost is high, especially the input cost of related equipment is high, and the economic value is low; secondly, after the waste SCR denitration catalyst is pickled, a large amount of effective V components will be lost, and It will cause difficulties in wastewater treatment and high cost of treatment input; finally, new addition of white carbon black in the mixed slurry, as we all know, compared to TiO 2 Substrate, SiO 2 The catalytic activity of the V / W catalyst of the matrix is ​​low, because the active components have fewer active sites on the Si matrix

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Method for recovering waste SCR denitrification catalyst

[0026] (1) Dust removal treatment: the waste tungsten, vanadium, molybdenum and titanium system honeycomb denitrification catalyst is broken into small pieces with a size of 1-10 cm by a jaw crusher, and then sieved through a vibrating screen with a mesh number of 50 mesh to remove dust;

[0027] (2) Grinding and impurity removal treatment: take 100kg of the waste SCR denitrification catalyst treated in step (1) and mix it with 500kg of water, then add 0.5kg of isomeric alcohol ether and 0.8kg of EDTA, mix well and carry out ball milling until the waste SCR denitration catalyst The particle size D50 is 120nm, then filtered to obtain the waste SCR denitration catalyst filter cake;

[0028] (3) Preparation of calcined slurry: according to the mass ratio of waste SCR denitration catalyst filter cake and metatitanic acid as 1:4, waste SCR denitration catalyst filter cake and (NH4) 2 CO 3 The mass ratio of 100:0.1 ...

Embodiment 2

[0032] Method for recovering waste SCR denitrification catalyst

[0033] (1) Dust removal treatment: After the waste tungsten-vanadium-titanium honeycomb denitration catalyst is broken into small pieces with a size of 1-10 cm by a jaw crusher, it is sieved through a vibrating screen with a mesh number of 55 to remove dust;

[0034] (2) Grinding and impurity removal treatment: Take 100kg of the waste SCR denitration catalyst treated in step (1) and mix it with 550kg of water, then add 1kg of isomeric alcohol ether and 1kg of EDTA, mix and ball mill until the waste SCR denitration catalyst is fine The diameter D50 is 140nm, and then filtered to obtain the waste SCR denitration catalyst filter cake;

[0035] (3) Preparation of calcined slurry: the mass ratio of waste SCR denitrification catalyst filter cake to metatitanic acid is 1:3, and the mass ratio of waste SCR denitrification catalyst filter cake to cornstarch is 100:0.5, to the step (2). Add metatitanic acid and cornstarc...

Embodiment 3

[0039] Method for recovering waste SCR denitrification catalyst

[0040] (1) Dust removal treatment: After the waste vanadium molybdenum titanium system honeycomb denitrification catalyst is broken into small pieces with a size of 1-10cm by a jaw crusher, it is sieved through a vibrating screen with a mesh number of 60 to remove dust;

[0041](2) Grinding and impurity removal treatment: Take 100kg of the waste SCR denitrification catalyst treated in step (1) and mix it with 600kg of water, then add 0.7kg of isomeric alcohol ether and 0.5kg of EDTA, mix and ball mill until the waste SCR denitration catalyst The particle size D50 is 130nm, and then filtered to obtain the waste SCR denitration catalyst filter cake;

[0042] (3) Preparation of calcined slurry: according to the mass ratio of waste SCR denitration catalyst filter cake and metatitanic acid as 2:3, waste SCR denitration catalyst filter cake and (NH4) 2 CO 3 The mass ratio of 100:1 is added to the waste SCR denitrati...

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PUM

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Abstract

The invention relates to a method for recovering waste SCR denitrification catalyst and regenerated SCR denitrification catalyst carrier powder, which belongs to the technical field of catalyst recovery and regeneration. The method crushes the waste SCR denitration catalyst, sieves and removes dust, grinds and removes impurities, and then mixes it with After the metatitanic acid and the pore-forming agent are mixed, they are calcined and crushed to finally obtain the carrier powder of the regenerated SCR denitration catalyst. Among them, in the process of grinding and removing impurities, a certain amount of isomeric alcohol ether and EDTA is added to the waste SCR denitrification catalyst and then ball milled. Because the isomeric alcohol ether and EDTA have dispersion, homogenization and complexation, it can effectively Remove Na, K, Ca and other harmful impurities in the slurry, so that it can be used for the preparation of new SCR denitrification catalysts after supplementing meta-acid and pore-forming agents. This method has the advantages of simple operation, low equipment requirements, low cost, and low pollution. And other advantages, can be applied to industrial production on a large scale.

Description

technical field [0001] The invention belongs to the technical field of catalyst recycling and regeneration, and in particular relates to a method for recycling a waste SCR denitration catalyst and a regenerated SCR denitration catalyst carrier powder. Background technique [0002] Long-term high-temperature and high-ash operating conditions will poison the SCR denitrification catalyst, such as the poisoning effect of Na, K, Ca and other oxides, which will reduce the specific surface area of ​​the SCR denitrification catalyst, resulting in reduced activity or even deactivation of the catalyst, making the catalyst ineffective , and was discarded. [0003] At present, although the waste SCR catalyst is identified as hazardous waste (Environment Office Letter [2014] No. 610), the WO in the waste SCR catalyst 3 , V 2 o 5 、MoO 3 、TiO 2 It has high recycling value, therefore, the comprehensive recycling technology research of waste SCR catalyst is of great significance. At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/52B01J38/48B01J38/02B01D53/96B01D53/86B01D53/56
CPCB01D53/8628B01D53/96B01J38/02B01J38/485B01J38/52
Inventor 吴涛毛久勇刘显彬段明华杨欢邓巧莲邓雷
Owner CHONGQING YUANDA CATALYST MFG