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Low-cost recovery and regeneration method of waste scr catalyst and regenerated scr catalyst carrier

An SCR catalyst and catalyst technology, applied in the field of regenerating SCR catalyst carrier, can solve the problems of lengthy route, short service life of catalyst, complicated operation, etc., and achieve the effect of reducing drying crack rate and wear rate, reducing production cost and increasing pore volume

Active Publication Date: 2016-05-18
PANZHIHUA ZHENGYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The patent application with the application number CN201210492800.0 discloses a recycling and regeneration method for waste SCR catalysts. This method is only after soot blowing and ball milling, adding active substances such as metal oxides to make catalysts, in which harmful substances such as sodium, potassium and other ions cannot be removed, and ball milling cannot reach the effective particle diameter, resulting in a short service life of the catalyst made by this method, and a rapid reduction in catalytic ability; and the present invention effectively solves the above problems
[0007] The patent application with the application number CN201310434204.1 discloses a recovery and regeneration method for waste SCR catalysts. There are three methods for this method: 1. Completely separate the components of the catalyst to re-obtain separate titanium dioxide, tungsten trioxide and other substances , the route is lengthy, the operation is complicated, the cost is high, and the economic value is low; 2 is on-line regeneration through soot blowing, drying, etc., the regenerated catalyst has low activity recovery ability, and it can only be used for catalysts that are only blocked but not poisoned; 3 is the production of rutile In the regeneration process of pigment titanium dioxide, the waste SCR catalyst is crushed to about 300 mesh (about 44 μm), and then the product is obtained through pickling, water washing, pressure filtration, concentration, hydrolysis, suction filtration, bleaching, calcination, etc.; but the rutile titanium dioxide Can only be used on pigments, not as a carrier for SCR catalysts

Method used

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  • Low-cost recovery and regeneration method of waste scr catalyst and regenerated scr catalyst carrier

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Weigh 25 kg of waste catalyst, break it into small pieces of 0.5-1cm by a plastic crusher, pass through a 50-mesh vibrating sieve, add water to wash the dust, put the washed catalyst fragments into 60 kg of dilute nitric acid with a concentration of 1M and soak 1-2 hours, after filtration, wet pulverization by pulverizer, add 50 kg of water, control the concentration of catalyst slurry at 26wt%, put it into sand mill for ultrafine pulverization, and take samples to detect that the particle diameter is 20-55nm as qualified; unqualified two Second beating;

[0038] Catalyst slurry with qualified particle size and TiO 2 The metatitanic acid slurry with a content of 26wt% is mixed according to the mass ratio of 1:1, add pure water until titanium dioxide accounts for about 23wt% of the total slurry, add ammonia water to adjust the pH to 7.5, and add ammonium paratungstate and white carbon black , the addition amount meets the following requirements respectively: WO 3 The c...

Embodiment 2

[0041] Weigh 25 kg of waste catalyst, break it into small pieces of 0.5-1cm by a plastic crusher, pass through a 50-mesh vibrating sieve, add water to wash the dust, put the washed catalyst fragments into 60 kg of dilute nitric acid with a concentration of 1M and soak 1-2 hours, after filtration, wet pulverization by pulverizer, add water to adjust the concentration of catalyst slurry to control at 30wt%, put into sand mill for superfine pulverization, and take samples to detect that the particle diameter is 50-100nm as qualified; unqualified for the second time beating;

[0042] The catalyst slurry with the above-mentioned qualified particle size and TiO 2 The metatitanic acid slurry with a content of 30wt% is mixed at a mass ratio of 1:9, pure water is added until titanium dioxide accounts for about 23wt% of the total slurry, ammonia water is added to adjust the pH to 8.0, and ammonium paratungstate and white carbon black are added , the addition amount meets the following ...

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Abstract

The invention discloses a low-cost recovery and regeneration method for a waste SCR catalyst and a regenerated SCR catalyst carrier. The recovery and regeneration method of the waste SCR catalyst is to mix the catalyst with metatitanic acid slurry to prepare titanium tungsten powder after preliminary treatment, remove the harmful components in the waste catalyst, and keep the active components in the catalyst, so as to obtain a low The recovery and regeneration method is cost-friendly and environmentally friendly, and the performance effects of the regenerated catalyst carrier in all aspects can reach the standard for preparing SCR catalysts, and has excellent performance.

Description

technical field [0001] The invention belongs to the field of recovery and regeneration of denitration catalysts, and in particular relates to a low-cost recovery and regeneration method of waste SCR denitration catalysts and a regenerated SCR catalyst carrier prepared therefrom. Background technique [0002] As the impact of PM2.5 on the environment becomes more and more serious, people pay more and more attention to factors such as smoke and automobile exhaust that produce PM2.5. More and more stringent, Selective Catalytic Reduction (SCR) denitrification technology is widely used in the denitrification system of coal-fired power plants due to its efficient and reliable denitrification performance. The principle of SCR denitrification technology is to inject NH into the exhaust gas of the boiler 3 These reducing agents react with the NOx in the flue gas under the action of the catalyst to generate harmless nitrogen and water. The core of SCR denitrification technology is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/92B01J38/00B01J32/00
Inventor 朱建兵李振兴
Owner PANZHIHUA ZHENGYUAN TECH
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