Method for preparing denitration catalyst by recycling raw material from waste catalyst

A technology of waste catalyst and denitration catalyst, applied in the field of denitration catalyst, can solve the problems of short life, low catalytic efficiency, poor denitration catalyst activity, etc., and achieve the effect of reducing investment

Inactive Publication Date: 2017-12-12
江苏浩日朗环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Technical problem: In order to solve the defects of poor activity, low catalytic efficiency and short service life of the denitrification catalyst prepared from the active components recovered from the existing waste denitrification catalyst, the present invention provides a denitrification powder recovered from the waste catalyst as raw material to prepare denitrification catalyst The method for catalyst, its technical scheme is as follows:

Method used

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  • Method for preparing denitration catalyst by recycling raw material from waste catalyst
  • Method for preparing denitration catalyst by recycling raw material from waste catalyst
  • Method for preparing denitration catalyst by recycling raw material from waste catalyst

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Effect test

Embodiment 1

[0070] The recovery method of spent denitrification catalyst comprises the following sequential steps:

[0071] 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 spent catalyst after the above pickling Soak to remove arsenic and its compounds. The cleaning time is 16 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 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

[0089] The recovery method of spent denitrification catalyst comprises the following sequential steps:

[0090] Wash and dry the scrapped denitrification catalyst with a mass percentage concentration of 26% nitric acid solution for 20 hours to remove impurities on the surface of the catalyst; use a mass percentage concentration of 35% sodium hydroxide solution to clean the waste 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 and mercury is removed with sodium hydrogen sulfide solution. The mass percentage concentration of sodium hydrogen sulfide 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 deni...

Embodiment 3

[0108] The recovery method of spent denitrification catalyst comprises the following sequential steps:

[0109] Wash and dry the spent 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 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 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 powder ...

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Abstract

The invention provides a method for preparing a denitration catalyst by recycling a raw material from a waste catalyst, belongs to the technical field of denitration catalysts, and solves the problems that the conventional denitration catalyst prepared from an active component recycled from the waste denitration catalyst is poor in activity and low in catalytic efficiency. The method comprises the following steps: mixing denitration powder, glass fiber and cerium dioxide, then mixing with ordinary Portland cement, preparing ceramic powder, then kneading the ceramic powder, glycerol, ethylene glycol, carboxymethyl cellulose and water into a ceramic clay material, performing vacuum extrusion, and drying to obtain the final denitration catalyst, wherein the denitration powder is prepared according to the following steps: cleaning the surface of the waste denitration catalyst by using nitric acid, removing arsenic by using a sodium hydroxide solution, removing mercury by using sodium hydrosulfide, cleaning by using deionized water, drying, calcinating, crushing, and performing jet milling to obtain the denitration powder. The denitration catalyst prepared by the method provided by the invention still keeps the nitrogen oxide converting efficiency of 95% at 150-420 DEG C.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, and in particular relates to a method for preparing a denitration catalyst by using waste catalysts as raw materials. 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. Toxicity, after product replacement, how to deal with these spent catalysts and realize the recycling of resources is an imminent issue. For this reason, people con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01J23/30B01D53/8628B01D2258/0283B01J23/002B01J35/04B01J2523/00B01J2523/3712B01J2523/55B01J2523/69
Inventor 施雅琼张现龙
Owner 江苏浩日朗环保科技有限公司
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