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Method for preparing denitration catalyst by taking denitration powder recovered from waste and old catalysts as raw material

A technology for waste catalysts and denitrification catalysts, applied in the field of denitrification catalysts, can solve the problems of short life, low catalytic efficiency, and poor activity of denitrification catalysts, 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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] 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 method for preparing the denitrification catalyst by using the denitrification powder recovered from the waste catalyst as raw material , its technical scheme is as follows:

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  • Method for preparing denitration catalyst by taking denitration powder recovered from waste and old catalysts as raw material
  • Method for preparing denitration catalyst by taking denitration powder recovered from waste and old catalysts as raw material
  • Method for preparing denitration catalyst by taking denitration powder recovered from waste and old catalysts as raw material

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Embodiment 1

[0072] The recovery method of waste denitration catalyst includes the following sequential steps:

[0073] Wash and dry the scrapped denitrification catalyst with a 20% nitric acid solution by mass percentage. The cleaning time is 16 hours to remove impurities on the catalyst surface; use a 30% sodium hydroxide solution with a mass percentage concentration of 30% sodium hydroxide solution to wash and dry the above-mentioned waste catalyst after pickling Soaking to remove arsenic and its compounds, the cleaning time is 16h, and the waste catalyst after arsenic removal is cleaned with sodium hydrosulfide solution to remove mercury. The mass percentage concentration of sodium hydrosulfide solution is 15%, and the cleaning time is 15h. Use deionization Water cleaning, drying, calcination, crushing, jet pulverization and other processes. Deionized water cleaning time is 12h, drying temperature is 120℃, drying time is 12h, calcination temperature is 550℃, calcination time is 12h, median...

Embodiment 2

[0091] The recovery method of waste denitration catalyst includes the following sequential steps:

[0092] Wash and dry the scrapped denitrification catalyst with a 26% nitric acid solution by mass percentage. The cleaning time is 20 hours to remove impurities on the catalyst surface; use a sodium hydroxide solution with a mass percentage concentration of 35% to clean the above-mentioned acid-washed spent catalyst Soak to remove arsenic and its compounds. The cleaning time is 20h. The waste catalyst after arsenic removal is cleaned with sodium hydrosulfide solution to remove mercury. The mass percentage concentration of sodium hydrosulfide solution is 20%. The cleaning time is 16h. Use deionization. Water cleaning, drying, calcination, crushing, jet pulverization and other processes, deionized water cleaning time is 16h, drying temperature is 130℃, drying time is 14h, calcination temperature is 600℃, calcination time is 16h, median size after pulverization It is 1μm to obtain den...

Embodiment 3

[0110] The recovery method of waste denitration catalyst includes the following sequential steps:

[0111] Wash and dry the scrapped denitrification catalyst with 15% nitric acid solution by mass percentage. The cleaning time is 10 hours to remove impurities on the catalyst surface; use 15% sodium hydroxide solution with mass percentage concentration to wash the above-mentioned waste catalyst after pickling Soak to remove arsenic and its compounds. The cleaning time is 10h. Use sodium hydrosulfide solution to clean the waste catalyst after removing arsenic to remove mercury. The mass percentage concentration of sodium hydrosulfide solution is 10%, and the cleaning time is 11h. Water cleaning, drying, calcination, crushing, jet pulverization and other processes. Deionized water cleaning time is 11h, drying temperature is 80℃, drying time is 10h, calcination temperature is 450℃, calcination time is 10h, and the median particle size after crushing It is 1μm to obtain denitrification...

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Abstract

A method for preparing a denitration catalyst by taking a denitration powder recovered from waste and old catalysts as a raw material belongs to the technical field of denitration catalysts, and solves the problems that a denitration catalyst prepared from active compositions recovered from conventional waste and old denitration catalysts is bad in activity and low in catalytic efficiency. The method comprises the following steps: mixing the denitration powder, glass fiber and cerium dioxide, then mixing with ordinary portland cement to prepare a ceramic powder, then kneading the ceramic powder, glycerin, glycol, carboxymethyl cellulose and water to form a ceramic body paste, and performing vacuum extrusion and drying to obtain the finished product. The denitration powder is prepared according to the method: using nitric acid to wash the surfaces of the waste and old denitration catalysts, then using a sodium hydroxide solution to remove arsenium , using sodium hydrosulfide to remove mercury, then using deionized water for washing, and then drying, calcining, fragmenting and crushing with an air flow, so as to obtain the denitration powder. The product obtained by the method still enables nitrogen oxides to have 95% of conversion rate at 150-420 DEG C.

Description

Technical field [0001] The invention belongs to the technical field of denitration catalysts, and particularly relates to a method for preparing a denitration catalyst using waste catalysts as raw materials. Background technique [0002] Nitrogen oxides are the main source of pollution in the atmosphere. They not only cause acid rain, photochemical smog and other problems that damage the earth's ecological environment, but also seriously endanger human health. Therefore, how to effectively remove nitrogen oxides has become an important topic of concern in the current environmental protection field. Ammonia selective catalytic reduction (SCR) has become the mainstream denitration technology for stationary sources such as thermal power plants due to its maturity and efficiency. In particular, vanadium-titanium-based denitrification catalysts have been commercialized products, but this product It is toxic. After the product is replaced, how to dispose of these waste catalysts and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30
Inventor 张现龙姜瑞霞焦雪静张蓓周坚刚
Owner SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH