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A kind of high-efficiency waste SCR denitrification catalyst recovery method

A technology for denitrification catalysts and waste catalysts, applied in chemical instruments and methods, titanium compounds, titanium dioxide, etc., can solve problems such as poor product purity, limited feasibility, unsatisfactory product purity, etc., and achieve the effect of efficient recovery

Active Publication Date: 2022-06-28
北京华电光大环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The content of tungsten element in the waste SCR denitrification catalyst is relatively low, and the efficiency of each reaction in the recovery process has a great influence on the final element recovery rate. However, it has been proposed that the precipitation rate of tungsten element in the process is often low, resulting in a large amount of precious Waste of elements, at the same time, a large amount of impurity elements will precipitate together with tungsten elements, the purity of the final product is not ideal, and the product value is generally low
The recovery process of titanium element has similar defects as that of tungsten element. The process is complicated, the recovery rate of elements is low, and the product purity is poor, which directly limits the feasibility of the process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: A method with V 2 O 5 -WO 3 / TiO 2 A method for preparing nano-zirconium tungstate and recovering crude titanium slag using waste SCR denitration catalyst as raw material, the specific steps include:

[0023] (1) Raw material pretreatment

[0024] The waste catalyst was roasted at 550°C for 6 hours, and after soot blowing treatment, the waste catalyst was further cleaned with a cleaning solution composed of 10% rosin polyoxyethylene resin (RPGC), 5% tartaric acid and 85% triethanolamine, and then pulverized to below 300 mesh to obtain Waste catalyst powder;

[0025] (2) Extraction of tungsten element

[0026] A saturated sodium chloride solution was prepared, the waste catalyst powder obtained in step (1) was slowly added to the saturated sodium chloride solution, stirred to a paste, and then calcined at 750°C for 6 hours to obtain agglomerates; pulverize the agglomerates to 150 mesh, and use The sodium tungstate generated after roasting is repeatedly l...

Embodiment 2

[0034] Example 2: A method with V 2 O 5 -WO 3 / TiO 2 A method for preparing nano-zirconium tungstate and recovering crude titanium slag using waste SCR denitration catalyst as raw material, the specific steps include:

[0035] (1) Raw material pretreatment

[0036] The waste catalyst was roasted at 650°C for 4 hours, and after soot blowing treatment, the waste catalyst was further cleaned with a cleaning solution composed of 20% rosin polyoxyethylene resin (RPGC), 15% tartaric acid and 65% triethanolamine, and then pulverized to below 300 mesh to obtain Waste catalyst powder;

[0037] (2) Extraction of tungsten element

[0038] A saturated sodium chloride solution was prepared, the waste catalyst powder obtained in step (1) was slowly added to the saturated sodium chloride solution, stirred to a paste, and then calcined at 850 °C for 3 hours to obtain agglomerates; The sodium tungstate generated after roasting is repeatedly leached with an ethanolamine solution with a vo...

Embodiment 3

[0046] Example 3: A method with V 2 O 5 -WO 3 / TiO 2 A method for preparing nano-zirconium tungstate and recycling crude titanium slag using waste SCR denitration catalyst as raw material, the specific steps include:

[0047] (1) Raw material pretreatment

[0048] The waste catalyst was roasted at 750° C. for 3 hours, and after soot blowing treatment, the waste catalyst was further cleaned with a cleaning solution composed of 15% rosin polyoxyethylene resin (RPGC), 10% tartaric acid and 75% triethanolamine, and then pulverized to below 300 mesh to obtain Waste catalyst powder;

[0049] (2) Extraction of tungsten element

[0050] A saturated sodium chloride solution was prepared, the waste catalyst powder obtained in step (1) was slowly added to the saturated sodium chloride solution, stirred to a paste, and then calcined at 800°C for 4 hours to obtain agglomerates; pulverize the agglomerates to 150 mesh, and use The sodium tungstate generated after roasting is repeatedly...

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Abstract

The invention relates to a method for recovering an efficient waste SCR denitrification catalyst, which belongs to the field of non-ferrous metal recovery. The invention provides a process for recovering tungsten element from waste SCR denitrification catalyst, and greatly improves the comprehensive benefit of titanium element recovery, mainly including raw material pretreatment, tungsten element extraction, crude titanium slag recovery, tungsten element purification, zirconium tungstate Recycling and other steps. The process has the advantages of high product value, small loss of target recovered elements, and low cost investment, and can realize efficient disposal of waste SCR denitrification catalysts.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal recycling, in particular to a method for recycling waste SCR denitration catalyst with high efficiency, in particular to a method for preparing nano zirconium tungstate and recycling crude titanium slag by using waste SCR denitration catalyst as raw material. Background technique [0002] With the gradual improvement of environmental protection awareness and requirements, in addition to power plants, steel, waste incineration, cement, glass and other industries have also begun to be required to remove nitrogen oxides from flue gas, and develop flue gas conditions for different industries. The new SCR denitration catalyst has always been a technical hotspot and difficulty in the field of denitration. At the same time, with the development and application of new SCR denitration catalysts suitable for various types of flue gas, the output of waste SCR denitration catalysts has also increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00C01G23/047B82Y40/00C22B34/36C22B1/02C22B7/00C22B34/12
CPCC01G41/00C01G41/003C01G23/0475C01G23/001B82Y40/00C22B34/365C22B1/02C22B7/008C22B34/1254C01P2006/80Y02P10/20
Inventor 任翠涛陈晨曲艳超李永光
Owner 北京华电光大环境股份有限公司
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