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Efficient waste SCR denitration catalyst recovery method

A technology for denitrification catalysts and waste catalysts, applied in chemical instruments and methods, inorganic chemistry, tungsten compounds, etc., can solve the problems of poor product purity, low precipitation rate, low product value, etc., and achieve the effect of efficient recovery

Active Publication Date: 2021-06-15
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

[0024] Example 1: A V 2 o 5 -WO 3 / TiO 2 A method for preparing nano-zirconium tungstate and recovering coarse titanium slag from a waste SCR denitrification catalyst. The specific steps include:

[0025] (1) Raw material pretreatment

[0026] The waste catalyst was calcined at 550°C for 6h, after the soot blowing treatment, the waste catalyst was further cleaned with a cleaning solution composed of 10% rosin polyoxyethylene grease (RPGC), 5% tartaric acid and 85% triethanolamine, and then crushed to below 300 mesh to obtain waste catalyst powder;

[0027] (2) Extraction of tungsten element

[0028] Prepare a saturated sodium chloride solution, slowly add the waste catalyst powder obtained in step (1) into the saturated sodium chloride solution, stir until it becomes a paste, and roast at 750° C. for 6 hours to obtain a sintered block; crush the sintered block to 150 mesh, use The ethanolamine solution with a volume concentration of 10% repeatedly leached the sodium tung...

Embodiment 2

[0036] Example 2: A V 2 o 5 -WO 3 / TiO 2 A method for preparing nano-zirconium tungstate and recovering coarse titanium slag from a waste SCR denitrification catalyst. The specific steps include:

[0037] (1) Raw material pretreatment

[0038] The waste catalyst was calcined at 650°C for 4h, after the soot blowing treatment, the waste catalyst was further cleaned with a cleaning solution composed of 20% rosin polyoxyethylene grease (RPGC), 15% tartaric acid and 65% triethanolamine, and then crushed to below 300 mesh to obtain waste catalyst powder;

[0039] (2) Extraction of tungsten element

[0040] Prepare a saturated sodium chloride solution, slowly add the waste catalyst powder obtained in step (1) into the saturated sodium chloride solution, stir until it becomes a paste, and roast at 850° C. for 3 hours to obtain a sintered block; crush the sintered block to 150 mesh, use The ethanolamine solution with a volume concentration of 20% repeatedly leached the sodium tun...

Embodiment 3

[0048] Example 3: A V 2 o 5 -WO 3 / TiO 2 A method for preparing nano-zirconium tungstate and recovering coarse titanium slag from a waste SCR denitrification catalyst. The specific steps include:

[0049] (1) Raw material pretreatment

[0050] The waste catalyst was roasted at 750°C for 3h, after the soot blowing treatment, the waste catalyst was further cleaned with a cleaning solution composed of 15% rosin polyoxyethylene grease (RPGC), 10% tartaric acid and 75% triethanolamine, and then crushed to below 300 mesh to obtain waste catalyst powder;

[0051] (2) Extraction of tungsten element

[0052] Prepare a saturated sodium chloride solution, slowly add the waste catalyst powder obtained in step (1) into the saturated sodium chloride solution, stir until it becomes a paste, and roast at 800°C for 4 hours to obtain a sintered block; crush the sintered block to 150 mesh, and use The ethanolamine solution with a volume concentration of 15% repeatedly leached the sodium tu...

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Abstract

The invention relates to an efficient waste SCR denitration catalyst recovery method, and belongs to the field of non-ferrous metal recovery. The novel process for recovering the tungsten element from the waste SCR denitration catalyst is provided, the comprehensive benefits of titanium element recovery are greatly improved, and the process mainly comprises the steps of raw material pretreatment, tungsten element extraction, crude titanium slag recovery, tungsten element purification, zirconium tungstate recovery and the like. The process has the advantages of high product value, small loss of target recovered elements, low cost input and the like, and can realize efficient treatment of the waste SCR denitration catalyst.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal recovery, and in particular relates to a method for recovering an efficient waste SCR denitration catalyst, in particular to a method for preparing nano zirconium tungstate and recovering coarse 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, industries such as steel, waste incineration, cement, and glass have also begun to be required to remove nitrogen oxides from flue gas, and the development of 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 denitrification catalysts suitable for various types of flue gas, the output of waste SCR denitrification c...

Claims

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Application Information

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Patent Type & Authority Applications(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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