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Recovery system and recovery method for recovering titanium and tungsten powder from waste scr catalyst

The technology of SCR catalyst and recovery method is applied in the recovery system and recovery field of recovering titanium and tungsten powder from waste SCR catalyst, which can solve the problems of environmental pollution, waste of resources, deactivation of SCR catalyst, etc., and achieve high recovery efficiency and resource saving. , Improve the effect of resource reuse

Active Publication Date: 2020-12-11
JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the denitration reaction, trace amounts of alkali metals, sulfur, arsenic, mercury and other substances in the flue gas deposit or react with active substances, causing the SCR catalyst to deactivate quickly, and eventually the catalyst cannot meet the emission requirements and the catalyst must be replaced
The replaced spent catalyst contains not only fly ash and metal impurities, but also Ti, W, V and other metals. Discarding these metal-rich spent catalysts is not only a waste of resources, but also pollutes the environment.

Method used

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  • Recovery system and recovery method for recovering titanium and tungsten powder from waste scr catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The recovery method that reclaims titanium-tungsten powder from waste SCR catalyst comprises the steps:

[0082] After the fly ash on the surface of the spent SCR catalyst is sucked by the dust suction treatment device 1, it is physically crushed in the coarse crushing treatment device 2, coarsely crushed to a sheet shape of 8 mm × 8 mm, and transported to the screening treatment device 3 by a conveyor belt. The sub-processing device 3 is fully enclosed, and there is a groove for receiving free fly ash below, and the sieving screen is 200 mesh.

[0083] The sieved flake material enters the initial cleaning treatment device 4, which is equipped with ultrapure water and cleaning aids. The concentration of cleaning aids is 0.001% of the mass of the material, and the leaching time is 30 minutes. The material after the initial cleaning treatment device 4 enters the deep cleaning treatment device 5. There is a deep cleaning liquid in the device, and the mass ratio of the mate...

Embodiment 2

[0086] The recovery method that reclaims titanium-tungsten powder from waste SCR catalyst comprises the steps:

[0087] After the fly ash on the surface of the spent SCR catalyst is sucked by the dust suction treatment device 1, it is physically crushed in the coarse crushing treatment device 2, coarsely crushed to a sheet shape of 15 mm × 15 mm, and transported to the screening treatment device 3 by a conveyor belt, and then sieved. The sub-processing device 3 is fully enclosed, and there is a groove for receiving free fly ash below, and the sieving screen is 100 mesh.

[0088] The sieved flake material enters the initial cleaning treatment device 4, which contains ultrapure water and cleaning aids. The concentration of the cleaning aids is 0.003% of the mass of the material, and the leaching time is 10 minutes. The material after the initial cleaning treatment device 4 enters the deep cleaning treatment device 5. There is a deep cleaning liquid in the device, and the mass ra...

Embodiment 3

[0091] The recovery method that reclaims titanium-tungsten powder from waste SCR catalyst comprises the steps:

[0092] After the fly ash on the surface of the spent SCR catalyst is sucked by the dust suction treatment device 1, it is physically crushed in the coarse crushing treatment device 2, coarsely crushed to a sheet shape of 10mm×10mm, and transported to the screening treatment device 3 by a conveyor belt. The sub-processing device 3 is fully enclosed, and there is a groove for receiving free fly ash below, and the sieving screen is 150 mesh.

[0093] The sieved flake material enters the initial cleaning treatment device 4, which contains ultrapure water and cleaning aids. The concentration of the cleaning aids is 0.002% of the mass of the material, and the leaching time is 20 minutes. The material after the initial cleaning treatment device 4 enters the deep cleaning treatment device 5. There is a deep cleaning liquid in the device, and the mass ratio of the material t...

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Abstract

The invention provides a recovery system for recovering titanium and tungsten powder from a waste SCR catalyst. The recovery system comprises a suction treatment device, a rough crushing treatment device, a screening treatment device, an initial stage cleaning treatment device, a deep cleaning treatment device, a pulping treatment device, an activating treatment device, a drying treatment device and a grinding treatment device. The invention also provides a recovery method for recovering titanium and tungsten powder from the waste SCR catalyst. The recovery system and the recovery method can be used for recovering titanium and tungsten powder from the waste SCR catalyst. The recovered titanium powder and tungsten powder are high in specific surface area, uniform in granularity and high inpurity, and can achieve re-utilization of resource of the waste SCR catalyst, so that resource is saved.

Description

technical field [0001] The invention relates to a recovery system and a recovery method for recovering titanium and tungsten powder from waste SCR catalysts. Background technique [0002] SCR (selective catalytic reduction) technology is currently one of the most mature technologies for removing nitrogen oxides, the core of which is the SCR catalyst. At present, a large number of V-W / Ti catalysts are used commercially. The catalyst itself is acidic and contains 1-3% sulfate. for NH 3 Selective catalytic reduction of nitrogen oxides to nitrogen and water. During the denitration reaction, trace amounts of alkali metals, sulfur, arsenic, mercury and other substances in the flue gas deposit or react with active substances, causing the SCR catalyst to deactivate quickly, and eventually the catalyst cannot meet the emission requirements and the catalyst must be replaced. The replaced spent catalyst contains not only fly ash and metal impurities, but also Ti, W, V and other metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/36C22B34/12
CPCC22B34/1204C22B34/1259C22B34/365
Inventor 张涛刘安阳祝建中罗民华
Owner JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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