Low cost recovery and regeneration method of waste SCR catalyst, and regenerated SCR catalyst carrier

Abstract

The present invention discloses a low cost recovery and regeneration method of a waste SCR catalyst, and a regenerated SCR catalyst carrier. According to the low cost recovery and regeneration method of the waste SCR catalyst, a catalyst is subjected to a primary treatment and then is mixed with a metatitanic acid slurry to co-prepare titanium-tungsten powder, harmful components in the waste catalyst are removed, and the active ingredients in the catalyst are retained so as to obtain the low cost and environmental protection recovery and regeneration method. In addition, various performance effects of the regenerated SCR catalyst carrier can achieve the standard for preparing the SCR catalyst, and the excellent performance is provided.

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 for waste SCR denitration catalysts and a regenerated SCR catalyst carrier prepared therefrom. Background technique [0002] As the impact of PM 2.5 on the environment is becoming more and more serious, people are paying more and more attention to factors such as flue gas and vehicle exhaust that generate PM 2.5. Since the 12th Five-Year Plan, my country's control of nitrogen oxide (NOx) emissions has become The more stringent, selective catalytic reduction (SCR) denitration technology is widely used in the denitration system of coal-fired power plants because of its efficient and reliable denitration performance. The principle of SCR denitration technology is to inject NH into the flue gas discharged from the boiler. 3 and other reducing agents, these reducing agents react with NOx in the fl...

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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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