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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

Inactive Publication Date: 2015-03-18
SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the problems of high cost of recovering denitrification powder from waste catalysts, poor activity of recovered denitrification powder, active components need to be added during use, and resulting in short service life and poor activity of the denitrification catalyst prepared by recovering denitrification powder, this paper The invention provides a method for recovering denitrification powder from spent catalysts, the technical scheme of which is as follows:

Method used

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  • Method for recovering denitration powder from waste catalyst
  • Method for recovering denitration powder from waste catalyst
  • Method for recovering denitration powder from waste catalyst

Examples

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Effect test

Embodiment 1

[0072] The recovery method of spent denitrification catalyst comprises the following sequential steps:

[0073] Wash and dry the scrapped denitrification catalyst with a mass percent concentration of 20% nitric acid solution for 16 hours to remove impurities on the surface of the catalyst; use a mass percent concentration of 30% sodium hydroxide solution to clean the waste catalyst after the above pickling Soak to remove arsenic and its compounds. The cleaning time is 16 hours. The waste catalyst after arsenic removal is cleaned with sodium hydrogen sulfide solution to remove mercury. The mass percentage concentration of sodium hydrogen sulfide solution is 15%, and the cleaning time is 15 hours. Water cleaning, drying, calcination, crushing, jet crushing and other processes, deionized water cleaning time is 12h, drying temperature is 120°C, drying time is 12h, calcination temperature is 550°C, calcination time is 12h, the median particle size after crushing The denitration pow...

Embodiment 2

[0091] The recovery method of spent denitrification catalyst comprises the following sequential steps:

[0092] Wash and dry the scrapped denitrification catalyst with a mass percent concentration of 26% nitric acid solution for 20 hours to remove impurities on the surface of the catalyst; use a mass percent concentration of 35% sodium hydroxide solution to clean the spent catalyst after the above pickling Soak to remove arsenic and its compounds. The cleaning time is 20 hours. The waste catalyst after arsenic removal is cleaned with sodium hydrosulfide solution to remove mercury. The mass percentage concentration of sodium hydrogensulfide solution is 20%, and the cleaning time is 16 hours. Water cleaning, drying, calcination, crushing, jet crushing and other processes, deionized water cleaning time is 16h, drying temperature is 130°C, drying time is 14h, calcination temperature is 600°C, calcination time is 16h, the median particle size after crushing The denitration powder i...

Embodiment 3

[0110] The recovery method of spent denitrification catalyst comprises the following sequential steps:

[0111] Wash and dry the scrapped denitrification catalyst with a mass percent concentration of 15% nitric acid solution for 10 hours to remove impurities on the surface of the catalyst; use a mass percent concentration of 15% sodium hydroxide solution to clean the waste catalyst after the above pickling Soak to remove arsenic and its compounds. The cleaning time is 10 hours. The spent catalyst after arsenic removal is cleaned with sodium hydrogen sulfide solution to remove mercury. The mass percentage concentration of sodium hydrogen sulfide solution is 10%, and the cleaning time is 11 hours. Water cleaning, drying, calcination, crushing, jet crushing and other processes, deionized water cleaning time is 11h, drying temperature is 80°C, drying time is 10h, calcination temperature is 450°C, calcination time is 10h, the median particle size after crushing The denitration powd...

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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.

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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Application Information

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IPC IPC(8): B01J23/92B01J23/30B01D53/86B01D53/56
Inventor 张现龙姜瑞霞焦雪静张蓓周坚刚
Owner SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH
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