Method for regenerating SCR catalyst by utilizing waste SCR catalyst vanadium extracting solution

A technology of SCR catalyst and extraction liquid, which is applied in the field of regenerating SCR catalysts by utilizing waste SCR catalyst vanadium extraction liquid, which can solve the problems of poor loading effect of active liquid and high energy consumption

Pending Publication Date: 2021-04-13
SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the calcification (alkali salt) roasting temperature is 800-1000°C, the energy consumption is high, and a large amount of calcium ions (alkali ions) are introduced during the leaching process, which will directly affect the loading effect when regenerating the SCR, resulting in The active liquid loading effect is not good

Method used

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  • Method for regenerating SCR catalyst by utilizing waste SCR catalyst vanadium extracting solution
  • Method for regenerating SCR catalyst by utilizing waste SCR catalyst vanadium extracting solution
  • Method for regenerating SCR catalyst by utilizing waste SCR catalyst vanadium extracting solution

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Embodiment 1

[0037] See attached figure 2 In this embodiment, the method for regenerating the SCR catalyst using the vanadium extraction solution of the waste SCR catalyst includes two parts: the vanadium extraction process of the SCR catalyst and the loading process of the regenerated SCR catalyst, wherein,

[0038] The SCR catalyst vanadium extraction process includes the following steps: A1, pretreatment: the waste SCR catalyst is pretreated with the cleaning agent and method in the publication number CN105032504A, and is obtained through ash cleaning and water cleaning, chemical cleaning and rinsing, and grinding and pulping. Slurry; A2, the first section of leaching: add the first section of acid leaching agent to the slurry obtained in step A1, the acid leaching agent is oxalic acid, the concentration of oxalic acid is 2%, the leaching temperature is 55 ° C, the liquid-solid ratio 3:1, the leaching time is 0.5h, and the first section of leaching solution and filter residue are obtai...

Embodiment 2

[0041] In this embodiment, the method for regenerating the SCR catalyst by using the vanadium extraction solution of the waste SCR catalyst, the specific technical scheme includes two parts: the SCR catalyst vanadium extraction process and the regenerated SCR catalyst loading process, wherein,

[0042] The SCR catalyst vanadium extraction process includes the following steps: A1, pretreatment: the waste SCR catalyst is pretreated by using the cleaning agent and method in the publication number CN105032504A, and is obtained through ash cleaning and water cleaning, chemical cleaning and rinsing, and grinding and pulping. Slurry; A2, the first section of leaching: add the first section of acid leaching agent to the slurry obtained in step A1, the acid leaching agent is sulfuric acid, the concentration of sulfuric acid is 4%, the leaching temperature is 65 ° C, liquid-solid Ratio 3:1, leaching time is 1.5h, after filtering, obtain the first stage leaching solution and filter residu...

Embodiment 3

[0045] In this embodiment, the method for regenerating the SCR catalyst by using the vanadium extraction solution of the waste SCR catalyst, the specific technical scheme includes two parts: the SCR catalyst vanadium extraction process and the regenerated SCR catalyst loading process, wherein,

[0046] The SCR catalyst vanadium extraction process includes the following steps: A1, pretreatment: the waste SCR catalyst is successively subjected to ash removal and water cleaning, chemical cleaning and rinsing, grinding and pulping to obtain a slurry; A2, the first stage of leaching: to step A1 obtained Add the first section of acid leaching agent to the slurry, the acid leaching agent is sulfuric acid, the concentration of sulfuric acid is 3%, the leaching temperature is 60°C, the liquid-solid ratio is 3:1, and the leaching time is 1h. After filtering, the first One-stage leaching solution and filter residue; A3, second-stage leaching: add the second-stage acid leaching agent to th...

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Abstract

A method for regenerating a SCR catalyst by utilizing a waste SCR catalystvanadium extracting solution comprises an SCR catalyst vanadium extracting process and a regenerated SCR catalyst loading process. The SCR catalyst vanadium extracting process comprises the following steps: A1, carrying out pretreatment; A2, carrying out first-stage leaching; A3, carrying out second-stage leaching; and A4, mixing and removing impurities. The regenerated SCR catalyst loading process comprises the following steps: B1, pretreatment; B2, primary dipping and drying; and B3, secondary dipping and drying. According to the method, the vanadium extracting solution of the waste SCR catalyst is used as the regenerated vanadium loading solution, so that the resource utilization of the waste SCR catalyst is realized, the regeneration cost is reduced, and the method has extremely high environmental and economic benefits; laboratory lab test detection and evaluation show that the prepared regenerative load sample has good physicochemical properties and denitration performance; AND the vanadium content on the surface of the regenerated catalyst can be increased by 1-40%, the tungsten loss amount is less than 2%, and the activity recovery rate is increased by 1-20%.

Description

technical field [0001] The invention belongs to the field of SCR catalyst regeneration of the environmental protection technology, and in particular relates to a method for regenerating the SCR catalyst by utilizing the vanadium extraction liquid of the waste SCR catalyst. Background technique [0002] SCR (Selective Catalytic Reduction Technology) catalyst regeneration, as a cost-effective technical solution in the current catalyst life management scheme, has been widely used. Due to the denitrification performance caused by physical deactivation such as macroscopic pore blockage and microscopic surface shielding of the catalyst, in the case of good mechanical properties, more than 90% of the denitrification performance can be achieved through ash cleaning, water washing regeneration, chemical cleaning, active loading and other process steps. recover. During the regeneration process, chemical cleaning will cause the loss of active components (vanadium or tungsten / molybdenu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/94B01J38/00B01J38/48B01J38/02B01D53/86B01D53/56B01D53/58B01D53/50C22B7/00C22B3/08C22B3/16C22B34/22
CPCB01J23/94B01J38/00B01J38/485B01J38/02B01D53/8628B01D53/8634B01D53/8609C22B7/009C22B7/007C22B3/08C22B3/165C22B34/225B01D2257/302B01D2257/404B01D2257/406Y02P10/20
Inventor 姚燕张发捷杨晓宁何川王乐乐孔凡海王丽朋鲍强雷嗣远卞子君马云龙王凯李昂吴国勋李乐田
Owner SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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