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A method for green recycling of honeycomb denitrification catalyst

A denitrification catalyst and honeycomb technology, which is applied in the field of green recycling of honeycomb denitrification catalysts, can solve the problems of large waste water production, large water consumption, and failure to maintain grades, so as to reduce the generation of waste water, avoid serious loss and be difficult to recycle. Effect

Active Publication Date: 2022-02-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method still uses high-energy calcification roasting, the recovery process consumes a lot of water and produces a large amount of wastewater, and the recovery of titanium uses ammonia recrystallization process. After recrystallization, the specific surface of titanium dioxide is greatly reduced, and it cannot be used for catalyst preparation after recrystallization.

Method used

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  • A method for green recycling of honeycomb denitrification catalyst

Examples

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Effect test

Embodiment example 1

[0040] A method for green recycling of a honeycomb denitrification catalyst. Two process routes of regeneration and re-preparation arranged side by side are arranged, and a regeneration process or a re-preparation process is selected according to the performance of the waste honeycomb denitrification catalyst to implement green recycling; the regeneration process and The basis for the selection of the re-preparation process is: the axial and radial compressive strengths of the waste honeycomb denitration catalyst are ≥1.0 and ≥0.2MPa respectively, and the specific surface area is ≥40.0m 2 / g, the regeneration process route is selected; otherwise, the re-production process route is selected.

[0041] The regeneration process is as follows:

[0042] (1) Purge: Use air to purge the surface and channels of the spent catalyst, and the air pressure is 0.3 MPa; further use sound waves to detect the situation of purge dead ends and blocked holes, and when the blocked holes are found, ...

Embodiment example 2

[0064] A method for green recycling of a honeycomb denitrification catalyst. Two process routes of regeneration and re-preparation arranged side by side are arranged, and a regeneration process or a re-preparation process is selected according to the performance of the waste honeycomb denitrification catalyst to implement green recycling; the regeneration process and The basis for the selection of the re-preparation process is: the axial and radial compressive strengths of the waste honeycomb denitration catalyst are ≥1.0 and ≥0.2MPa respectively, and the specific surface area is ≥40.0m 2 / g, the regeneration process route is selected; otherwise, the re-production process route is selected.

[0065] The regeneration process is as follows:

[0066] (1) Purge: use air to purge the surface and channels of the spent catalyst, and the air pressure is 0.4MPa; further use sound waves to detect the situation of purge dead ends and blocked holes, and when the blocked holes are found, u...

Embodiment example 3

[0088] A method for green recycling of a honeycomb denitrification catalyst. Two process routes of regeneration and re-preparation arranged side by side are arranged, and a regeneration process or a re-preparation process is selected according to the performance of the waste honeycomb denitrification catalyst to implement green recycling; the regeneration process and The basis for the selection of the re-preparation process is: the axial and radial compressive strengths of the waste honeycomb denitration catalyst are ≥1.0 and ≥0.2MPa respectively, and the specific surface area is ≥40.0m 2 / g, the regeneration process route is selected; otherwise, the re-production process route is selected.

[0089] The regeneration process is as follows:

[0090](1) Purge: use air to purge the surface and channels of the spent catalyst, and the air pressure is 0.5 MPa; further use sound waves to detect the situation of purge dead ends and blocked holes, and when the blocked holes are found, u...

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Abstract

The invention relates to a green recycling method for a honeycomb denitrification catalyst, which belongs to the field of flue gas denitrification and material recycling. Two process routes of regeneration and re-preparation are set up, and the regeneration production line and the re-preparation production line are arranged side by side; the regeneration process or the re-preparation process is selected according to the performance of the waste honeycomb denitrification catalyst for green recycling; the regeneration process and the re-preparation process The basis for selection is: the axial and radial compressive strengths of spent honeycomb denitration catalysts are ≥1.0 and ≥0.2MPa respectively, and the specific surface area is ≥40.0m 2 / g, the regeneration process route is selected; otherwise, the re-production process route is selected. The green recycling method of honeycomb denitrification catalyst provided by the present invention combines regeneration and re-preparation process, fully utilizes the valuable components in the spent denitrification catalyst, and greatly saves the amount of water, which can realize the closed loop of denitrification catalyst recycle.

Description

technical field [0001] The invention relates to a green recycling method for a honeycomb denitrification catalyst, which belongs to the field of flue gas denitrification and material recycling. Background technique [0002] Selective Catalytic Reduction (SCR) technology is the realization of industrial flue gas NO x An important technology for ultra-low emissions, the denitrification catalyst used in it is vulnerable to smoke, SO 2 , Alkali metal, As and other harmful substances are poisoned and deactivated, so the service life of the catalyst is short. The deactivated waste denitrification catalyst is a hazardous waste stipulated in the "National Hazardous Waste List". Its environmental risk is extremely high, but its recycling value is extremely high. If it is not disposed of properly, it will not only occupy land, pollute water and soil, but also cause serious waste of resources. . In 2014, the Ministry of Ecology and Environment issued the "Notice on Strengthening the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/60B01J38/50B01J38/48B01J38/00B01J23/92B01J23/30B01J35/04B01D53/86B01D53/56
CPCB01J38/60B01J38/50B01J38/485B01J38/00B01J23/30B01J23/92B01D53/8628B01J35/56
Inventor 张深根张柏林
Owner UNIV OF SCI & TECH BEIJING
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