Method for recovering denitration powder from waste catalyst

A technology of waste catalyst and denitration powder, applied in the field of denitration catalyst, can solve the problems of poor activity, poor denitration powder activity, short service life of denitration catalyst, etc., and achieve the effect of ensuring product size and preventing cracking
CN104415768AInactive Publication Date: 2015-03-18SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH
Publication Date
2015-03-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for recovering denitration powder from a waste catalyst, and belongs to the technical field of denitration catalysts. In the prior art, the recovered denitration powder has the poor activity. With the method of the present invention, the problem in the prior art can be solved. The method comprises: washing the surface of a waste denitration catalyst with a nitric acid solution with a mass percentage concentration of 5-30%, removing arsenic with a sodium hydroxide solution with a mass percentage concentration of 5-40%, removing mercury with sodium hydrosulfide with a mass percentage concentration of 2-20%, washing with deionized water, and then sequentially carrying out drying, calcination, crushing and jet milling to obtain the denitration powder. According to the present invention, the denitration catalyst obtained through the secondary preparation by adopting the denitration powder of the present invention as the raw material has the following characteristic that: the nitrogen oxide maintains 95% conversion efficiency when the gas reaction temperature is 150-420 DEG C.
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Description

technical field

[0001] The invention belongs to the technical field of denitrification catalysts, and in particular relates to a recovery method of spent catalysts. Background technique

[0002] Nitrogen oxides are the main pollution source of the atmosphere. It not only causes acid rain, photochemical smog and other problems that damage the earth's ecological environment, but also seriously endangers human health. Therefore, how to effectively remove nitrogen oxides has become an important topic of concern in the field of environmental protection. Ammonia selective catalytic reduction (selective catalytic reduction, SCR) has become the mainstream denitrification technology for stationary sources such as thermal power plants due to its maturity and high efficiency. In particular, vanadium-titanium-based denitrification catalysts have been commercialized products, but this product Toxic, after the product is replaced, how to deal with these spent catalysts and realize the re...

Claims

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