Recovery and regeneration method of waste scr denitrification catalyst and regenerated scr catalyst carrier

Abstract

The invention discloses a method for recovering and regenerating a waste SCR denitrification catalyst and a regenerated SCR catalyst carrier. The method for recovering and regenerating the waste SCR denitrification catalyst is to add the catalyst to the production process of metatitanic acid to produce titanium dioxide after preliminary treatment, remove the harmful components in the waste catalyst, and retain the active components in the catalyst, so as to obtain a It is a low-cost and environment-friendly recovery and regeneration method, 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 denitrification catalysts, and in particular relates to a low-cost and environment-friendly recovery and regeneration method of waste SCR denitrification 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 S...

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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

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