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A system for recovering heavy metals from waste scr catalysts and its treatment method

A technology of SCR catalyst and heavy metal, which is applied in the field of waste SCR catalyst recovery, can solve the problems of secondary toxic waste residue, secondary pollution, low production efficiency, etc., and achieve the goal of increasing the value of resource utilization, avoiding secondary pollution, and improving the value of resource utilization Effect

Active Publication Date: 2019-06-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, some heavy metals are being recycled on the surface, but in fact it has caused more serious secondary pollution
Some manufacturers in China also use the precipitation method to treat the process wastewater. Although the discharge of sewage has been reduced, metal precipitation has occurred, causing secondary toxic waste residues again.
And consume a lot of acid and alkali, low production efficiency

Method used

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  • A system for recovering heavy metals from waste scr catalysts and its treatment method
  • A system for recovering heavy metals from waste scr catalysts and its treatment method
  • A system for recovering heavy metals from waste scr catalysts and its treatment method

Examples

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Effect test

Embodiment 1

[0074] This embodiment provides a system for recovering heavy metals from waste SCR catalysts, the system includes an elution system 1, a waste water treatment system and a waste solid treatment system, wherein the liquid phase outlet of the elution system 1 is connected to the waste water treatment system The feed port of the filtering device 2 is connected, and the solid phase outlet of the elution system 1 is connected with the feed port of the crushing device 9 of the waste solid treatment system.

[0075] The wastewater treatment system includes a filter device 2, a magnetic enrichment device, a combined separator 5 and a solid phase sludge treatment system, wherein the liquid phase outlet of the filter device 2 is connected to the magnetic enrichment device and the combined separator 5 in sequence, and the filter The solid phase outlet of the device 2 is connected to the solid phase sludge treatment system, and the liquid phase outlet of the combined separator 5 is connec...

Embodiment 2

[0087] Except that the mixture of nano-scale activated carbon, nano-scale alumina and nano-scale resin adsorbent is used as the magnetic nano-adsorbent in the magnetic enrichment device 3, the combined separator 5 is a combination of an adsorption separator, an extraction separator and a precipitation separator. In addition, other device structures and device connection methods are the same as those in Example 1.

Embodiment 3

[0089] Except that the nano-scale resin adsorbent is used as the magnetic nano-adsorbent in the magnetic concentrator 3, and the combined separator 5 is a centrifugal separator, other device structures and connection methods are the same as those in Example 1.

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Abstract

The invention provides a system for recovering heavy metal from waste SCR catalysts and a treatment method thereof. The system comprises an elution system, a waste water treatment system and a waste solid treatment system, wherein a liquid phase outlet of the elution system is connected with the waste water treatment system, and a solid phase outlet of the elution system is connected with the waste solid treatment system. Surface accumulated dust of the waste SCR catalysts are removed through the elution system, high-purity vanadium pentoxide and sodium molybdate are recovered through the waste solid treatment system, and efficient separation of vanadium, tungsten and molybdenum is achieved. Process waste water and elution waste water of the system are enriched through a magnetic nanometer adsorbent in the waste water treatment system, the recycling resource value of toxic and harmful metals in waste water can be greatly improved, and metals such as arsenic, mercury, chromium and thallium in sewage can be recycled. Leaching slag titanium dioxide of the waste solid treatment system is recycled to be used as a magnetic adsorbent carrier in the waste water treatment system. According to the process, secondary waste residues are avoided, waste water is discharged, and the good effect of the closed circulation of various substances in the flue gas denitration industry chain can be achieved.

Description

technical field [0001] The invention belongs to the technical field of recovery of waste SCR catalysts, and relates to a system and a treatment method for recovering heavy metals from waste SCR catalysts, in particular to a system and treatment method for recovering heavy metals rich in waste SCR catalysts and carried on the surface. Background technique [0002] my country is a large energy consumption country dominated by thermal power generation, and a large amount of nitrogen oxides (NO x ). This compound is one of the main pollutants in the atmospheric environment, which brings serious harm to the global ecological environment and human life. In order to control the emission of nitrogen oxides, the Ministry of Environmental Protection of the People's Republic of China stipulates that after the low-nitrogen combustion technology is adopted in thermal power plants, when the concentration of nitrogen oxide emissions does not meet the total control requirements, flue gas d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/22C22B34/34C22B34/36C22B43/00C22B13/00C22B61/00C22B30/04
CPCC22B7/006C22B7/009C22B13/00C22B30/04C22B34/225C22B34/345C22B34/365C22B43/00C22B61/00
Inventor 宁朋歌王青杰曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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