CN111701585A - Resource utilization process of waste denitration catalyst - Google Patents
Resource utilization process of waste denitration catalyst Download PDFInfo
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Abstract
The invention discloses a resource utilization process of a waste denitration catalyst, and belongs to the technical field of resource utilization of waste catalysts. The process method comprises the following steps: pretreating a waste catalyst, activating, drying, calcining, adding the retreated catalyst into ethanol, adding a fiber sheet or a ceramic sheet, drying and calcining to obtain a catalytic filter material; and then coating the mixed solution of PTFE on the surface of the catalytic filter material, drying and calcining. The method for treating the waste denitration catalyst has the advantages of simple steps, low treatment cost and the like; the resource utilization process of the waste denitration catalyst reduces the treatment cost of the waste catalyst, realizes the reutilization of vanadium, tungsten, titanium and other valuable metal resources, realizes the integration of denitration and filtering equipment, has important practical value and significance for cost saving and high-efficiency emission reduction of industrial kilns, and is suitable for popularization and application.
Description
Technical Field
The invention relates to the technical field of resource utilization of waste catalysts, in particular to a resource utilization process of a waste denitration catalyst.
Background
Aiming at the treatment of the nitrogen oxide, the most widely applied denitration technology at present is mainly an SCR (selective catalytic reduction) technology, has the characteristics of high denitration rate (90%) and mature technology, but needs to meet the temperature window of 350 ℃ of 250 and low temperature and ash and the like, the low temperature and low ash mode is arranged at the downstream of a dust remover, the dust concentration is low, the abrasion and the poisoning of a catalyst can be reduced, but the smoke temperature is low, the smoke needs to be reheated to ensure the catalytic activity, the operation cost is high, and the temperature range of the high temperature and high ash mode is suitable, the catalyst has high catalytic efficiency, but the dust concentration is high, so the catalyst is easy to wear, block, chemically poison and the like, the service life of the catalyst is shortened, and the replacement cost of the catalyst is increased. Aiming at the problem of dust control, the current mainstream technologies are electric dust removal, bag dust removal and electric bag dust removal, wherein the bag dust remover is widely and mature in industrial furnaces and kilns, the temperature is 160-200 ℃, and the dust control method can meet the requirement of dust emission at the present stage.
Considering the factors of comprehensive catalytic activity, selectivity, anti-poisoning capability, cost and the like, V2O5As the main active substance, WO3、MO3Etc. as a catalyst promoter2Mixed support type catalysts are currently the most suitable and mainstream commercial catalysts. Although a great deal of research is carried out on the inactivation reason and the anti-poisoning capability of the catalyst by a plurality of scholars, in practical application, a large amount of inactivated catalyst is still generated, the regeneration frequency is limited, and the inactivated catalyst is finally changed into a waste catalyst which belongs to dangerous waste, so that the treatment cost is high, and the waste of resources is caused by directly discarding Ti, V, W, Mo and the like which belong to precious metals.
Most of the existing patents and technical researches are dry method, wet method or dry and wet combined recovery of SCR waste catalysts, such as invention patents CN106216364B, CN105536817A and CN106947864A, and have the main disadvantages of complicated steps, large acid and alkali consumption, more generated waste treatment liquid and higher cost; some patents develop materials or devices combining filtering dust removal and catalytic denitration, such as patent patents CN109289330A, CN109589873A, CN109513715A, CN208389603U and the like, but the use of fresh commercial or even modified catalysts still has the problems of cost and disposal of waste catalysts.
The implementation of the national ultra-low emission policy at present puts higher requirements on the green production and control cost of enterprises, so that the requirement on the activity of the catalyst of the existing denitration technology is higher, and a large amount of waste catalysts are generated due to inevitable abrasion, poisoning and the like in the actual operation process, so that the cost for treating the dangerous wastes is high, and the cost for purchasing fresh catalysts is also an important problem which troubles the enterprises. Therefore, the development of a low-temperature and high-efficiency technology integrating dust removal and denitration based on the modification of a particle filter by recycling the waste catalyst is of great significance to the industrial realization of ultralow emission.
Disclosure of Invention
In view of the above, the invention aims to provide a resource utilization process of a waste denitration catalyst.
Through research, the invention provides the following technical scheme:
1. a resource utilization process of waste denitration catalyst comprises the following steps,
pretreatment: carrying out dust removal, water washing, acid washing and grinding on the waste denitration catalyst;
activation treatment: placing the ground waste denitration catalyst into an active impregnation liquid for activation treatment, and then drying and calcining to obtain a retreated waste denitration catalyst;
loading a filter material: grinding the waste denitration catalyst, adding the ground waste denitration catalyst into ethanol to prepare a suspension, adding a fiber sheet or a ceramic sheet, stirring, dipping, drying and calcining to form a catalytic filter material;
coating treatment: mixing and stirring Polytetrafluoroethylene (PTFE), a foaming agent, a thickening agent and water, coating the mixture on the surface of a catalytic filter material to form a microporous layer, drying and calcining to obtain the multifunctional catalytic filter material.
Preferably, compressed air blowing or water washing is adopted for dust removal in the pretreatment process. The compressed air blowing is performed by adopting an air compressor, and the washing and dust removal are performed by adopting deionized water so as to remove the dust accumulated and blocked on the surface and in the pore channels of the waste denitration catalyst. And the water washing and ash removal are carried out for 30-60 min by soaking and ultrasonic oscillation cleaning with deionized water. The mass ratio of the deionized water to the waste denitration catalyst is 5-10: 1, so that soluble salts on the surface of the waste denitration catalyst are removed.
Preferably, the pickling in the pretreatment process is carried out for 30-60 min by ultrasonic oscillation cleaning with a sulfuric acid solution. So as to remove insoluble salts on the surface of the waste denitration catalyst, which have a poisoning effect on active components, and increase the acidity of the surface of the catalyst, so as to improve the ammonia adsorption capacity of the catalyst, and further improve the activity of the regenerated catalyst.
Preferably, the concentration of the sulfuric acid solution is 0.25-1M.
Preferably, the concentration of the sulfuric acid solution is 0.5M.
Wherein, the mechanical grinding process also comprises drying the waste denitration catalyst at the temperature of 70-110 ℃ for 20-60 min. In the pretreatment process, mechanical grinding is adopted to grind the mixture to 400-800 meshes. Fine and uniform particles are provided for subsequent activation treatment, so that the active components are uniformly impregnated on the surface of the catalyst, and the catalyst is firmly loaded on the filter material.
Preferably, the waste denitration catalyst is an irreversible deactivated vanadium-titanium based denitration catalyst.
Preferably, the active impregnation liquid is one or more aqueous solutions of ammonium metavanadate, ammonium n-vanadate, ammonium metatungstate, ammonium paratungstate and ammonium molybdate.
Preferably, the impregnation amount of the active impregnation liquid is 0.2-2 wt% of the waste catalyst.
Preferably, the activation treatment is stirring and soaking in an active soaking solution for 30-120 min. So as to supplement a small part of vanadium, tungsten, molybdenum and other active components lost in the operation process and the washing process of the waste denitration catalyst, thereby improving the catalytic activity of the regenerated waste denitration catalyst. XRF characterization test shows that the waste vanadium-tungsten-titanium mixed carrier type catalyst loses about 50 percent of V in the process of running abrasion and water washing2O5And WO to3And TiO2The content is basically unchanged, so only a small amount of vanadium needs to be supplemented, and most valuable metal resources such as vanadium, tungsten, titanium or molybdenum can be recovered.
Preferably, after the activation treatment, the drying is carried out for 5-12 h at the temperature of 90-110 ℃, and the calcining is carried out for 4-6 h at the temperature of 450-500 ℃. The drying temperature, the drying time, the calcining temperature and the calcining time can be properly adjusted, and the invention selects drying at 110 ℃ and drying at 45 DEG CCalcining at 0 deg.C to avoid high-temp sintering of catalyst and ensure the TiO carrier2Is anatase phase.
Preferably, in the suspension liquid in the filter material loading process, the concentration of the catalyst is 0.05-0.15 g/mL. The ethanol in the filter material loading process is absolute ethanol.
Preferably, the fiber sheet in the filter material load is a polyimide (P84) fiber sheet or a polyphenylene sulfide (PPS) fiber sheet.
Preferably, the ceramic sheet in the filter material load is a silicon carbide microporous ceramic sheet or a cordierite honeycomb ceramic sheet.
Wherein, the fiber sheet or the ceramic sheet is put into the suspension liquid to be stirred and dipped for 20-60 min. So as to ensure that the loading capacity of the waste denitration catalyst on the filter material is sufficient. After the stirring and dipping are finished, the mixture is taken out at normal temperature and dried. The drying in the loading process of the filter material is drying for 3 hours at the temperature of 90-110 ℃, the calcining temperature of the fiber sheet is 200-240 ℃, the calcining temperature of the ceramic sheet is 450-500 ℃, and the calcining time is 3 hours. The full removal of ethanol and water and the firm load of the reprocessed waste denitration catalyst on the filter material are ensured.
Preferably, in the catalytic filter material, the load of the catalyst is 400-600 g/m2。
Preferably, the mass ratio of the Polytetrafluoroethylene (PTFE), the foaming agent, the thickening agent and the water is 1: 0.1-0.75: 0.075-0.125: 1. The mixing and stirring time is 10-20 min.
Preferably, the mass ratio of the Polytetrafluoroethylene (PTFE), the foaming agent, the hydroxyethyl cellulose and the water is 1:0.5:0.125: 1.
Preferably, the foaming agent is Azodicarbonamide (AC), alkyl glycoside (APG), or sodium lauryl sulfate; the thickening agent is hydroxyethyl cellulose.
Preferably, in the coating treatment, the thickness of the microporous layer is 0.05-0.5 mm. The filter material attached with the reprocessed waste denitration catalyst is coated, so that the filter material coated with the PTFE microporous layer can maintain low pressure drop while efficiently filtering fine particles, and can further fix the reprocessed waste denitration catalyst to prevent the filter material from falling off. Under the condition of medium and high temperature, when the filter material is a silicon carbide honeycomb ceramic sheet or a cordierite honeycomb ceramic sheet for loading, mullite particles are sprayed to form the high-temperature-resistant microporous membrane.
After the microporous layer is formed by coating treatment, drying the microporous layer at the temperature of 70-110 ℃ for 1-2 min, and then calcining the microporous layer at the temperature of 220-250 ℃ for 30-60 min. The purpose of calcination is to ensure the full thermal decomposition of the foaming agent to generate dense micro-pores, thereby achieving the effect of efficiently filtering fine particles.
2. The multifunctional catalytic filter material is prepared by the resource utilization process.
3. The multifunctional catalytic filter material prepared by the resource utilization process is applied to a dust remover or a filter.
The application method of the multifunctional catalytic filter material comprises the following steps: install multi-functional catalytic filter material in sack cleaner or diesel particulate filter to realize filtering the dual efficiency of dust removal and catalytic denitration, carry out catalytic denitration processing promptly when filtering cigarette ash particulate matter in the flue gas, with the ultralow emission of realization nitrogen oxide, widen the active efficiency interval of front end denitration reactor simultaneously, thereby prolong the life of catalyst, greatly reduced catalyst cost is favorable to the green production and the cost control of enterprise.
The invention has the beneficial effects that:
1) the resource utilization process of the waste denitration catalyst is different from a waste catalyst recovery method of a wet method, a dry method or a dry-wet combined method, valuable metals on the waste catalyst do not need to be leached and recovered one by one, a large amount of acid-base soaking and precipitating agent precipitation are not needed, and the process has the advantages of small acid-base dosage, less waste liquid generation, simple steps, easy operation, low treatment cost and the like;
2) according to the resource utilization process for the waste denitration catalyst, only dust and toxic impurities on the surface of the waste catalyst need to be removed in the treatment process, and XRF (X-ray fluorescence) characterization test proves that the V loss of 50% of the waste vanadium-tungsten-titanium mixed carrier type catalyst is about 50% in the operation abrasion and water washing processes2O5And WO to3And TiO2The content is basically unchanged, so that most valuable metal resources such as vanadium, tungsten, titanium or molybdenum and the like can be recovered;
3) the catalytic activity of the waste and old denitration catalyst is remarkably recovered, the NOx conversion rate of the waste and old catalyst is less than 10%, the NOx conversion rate can be recovered to 93.6% at 350 ℃ and recovered to 98.5% of that of a fresh catalyst after the waste and old catalyst is subjected to the reprocessing, and the catalytic activity of the waste and old denitration catalyst is even higher than that of the fresh catalyst at 150-250 ℃;
4) according to the resource utilization process for the waste denitration catalyst, the adopted fiber sheet material is suitable for a medium-low temperature interval, and the adopted ceramic sheet material is suitable for a high-temperature interval, so that the resource utilization process has the advantage of strong universality;
5) according to the resource utilization process of the waste denitration catalyst, polytetrafluoroethylene, a foaming agent, a thickening agent and water are mixed and coated to form the microporous layer, so that the process has the advantages of strong filtering capacity, high heat resistance, strong corrosion resistance, strong flame retardance and the like;
6) the resource utilization process of the waste denitration catalyst reduces the environmental protection treatment cost of the waste catalyst, realizes the reutilization of vanadium, tungsten and other valuable metal resources, widens the catalytic activity interval of the front-end denitration reactor, prolongs the service life of the catalyst, saves the purchase cost of the fresh catalyst, has important practical value and significance for cost saving and high-efficiency emission reduction of industrial kilns, and is suitable for popularization and application.
Drawings
Fig. 1 is a process flow diagram of a resource utilization process of a waste denitration catalyst of the invention;
FIG. 2 is a graph showing the standard SCR reactivity of the catalyst after activation treatment in example 2 of the present invention;
FIG. 3 is a graph showing the rapid SCR reaction activity of the catalyst after activation treatment in example 2 of the present invention;
fig. 4 is a graph showing the standard and fast SCR reaction activities of the catalyst after the activation treatment, filter loading and coating treatment in example 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, a resource utilization process of a waste denitration catalyst comprises the following steps,
pretreatment: washing the irreversible deactivated vanadium-titanium based denitration catalyst with water to remove ash and dust; soaking with deionized water, and ultrasonic cleaning for 30 min; ultrasonic vibration cleaning with 0.5M dilute sulfuric acid for 30 min; drying at 110 deg.C for 30 min; mechanically grinding to 600-800 meshes;
activation treatment: placing the ground waste denitration catalyst into a 1 wt% ammonium metavanadate solution, carrying out stirring and dipping treatment for 30min, then drying for 8h at the temperature of 110 ℃, and calcining for 5h at the temperature of 450 ℃ to obtain a retreated waste denitration catalyst;
loading a filter material: grinding the reprocessed waste denitration catalyst to 800-1000 meshes, adding the ground waste denitration catalyst into absolute ethyl alcohol to prepare a suspension with the catalyst concentration of 0.15g/mL, then adding a polyimide (P84) fiber sheet material, stirring and soaking for 30min, drying for 2h at the temperature of 110 ℃, and calcining for 3h at the temperature of 250 ℃ to form a catalytic filter material;
coating treatment: mixing and stirring Polytetrafluoroethylene (PTFE), Azodicarbonamide (AC), hydroxyethyl cellulose and water according to the proportion of 1:0.5:0.125:1 for 30min to prepare a uniform mixed solution, then coating the uniform mixed solution on the surface of a catalytic filter material to form a microporous layer, drying the microporous layer at 70 ℃ for 2min, and then calcining the microporous layer at 230 ℃ for 30min to obtain the multifunctional catalytic filter material.
Example 2
This example studies the influence of ammonium metavanadate concentration on the catalytic efficiency of reprocessing waste denitration catalysts
The specific operation is as follows: the ammonium metavanadate concentration was replaced by 0.2 wt%, 0.4 wt%, 0.6 wt%, 0.8 wt%, or 2 wt% during the activation treatment, and the remaining procedure was the same as in example 1. And mechanically grinding the different reprocessed waste denitration catalysts subjected to the activation treatment, the fresh denitration catalyst and the waste denitration catalyst to 40-60 meshes. Then at a space velocity of 300000s-1And introducing standard SCR reaction atmosphere at 150-450 ℃ respectively: 500ppmNO, 500ppmNH3、5％O2And N2Introducing a rapid SCR reaction atmosphere at 180-450 ℃: 250ppmNO, 250ppmNO2、500ppmNH3、5％O2And N2Temperature-programmed tests were carried out for the catalytic efficiency of the different catalysts, and the results are shown in fig. 2 and 3.
In FIG. 2, Fresh-S corresponds to a Fresh denitration catalyst, A-S corresponds to a waste denitration catalyst, and 0.2V-S-2V-S corresponds to a reprocessed waste denitration catalyst after ammonium metavanadate concentration treatment. As can be seen from the analysis in fig. 2, the catalytic efficiency of the waste denitration catalyst is less than 10%, and when the temperature exceeds 350 ℃, the catalytic efficiency of the fresh denitration catalyst is greater than 90%. The activity of the reprocessed waste denitration catalyst after pretreatment and activation is greatly improved, and when the concentration of ammonium metavanadate is 1 wt% or 2 wt%, the catalytic efficiency of standard SCR is 82.9% and 85.9% respectively, and is 91.6% of the fresh catalyst, which is slightly lower than the catalytic efficiency of the fresh catalyst by 90.5%, but is far higher than the catalytic efficiency of the waste catalyst at 350 ℃. Therefore, the catalytic activity of the waste denitration catalyst can be effectively improved in the activation treatment process.
From the analysis in fig. 3, it can be seen that when the concentration of ammonium metavanadate is 1 wt%, the catalytic efficiency of the reprocessed waste denitration catalyst after the impregnation activation treatment is 94.1% in the rapid SCR reaction atmosphere, which is 88.9% higher than that of the fresh catalyst, and 88.1% higher than that of the catalyst after the impregnation activation treatment, which is 2 wt%.
Example 3
This example studies the effect of ammonium metavanadate concentration on the catalytic efficiency of the multifunctional catalytic filter
The specific operation is as follows: the waste denitration catalyst after different treatment in the example 2 is subjected to activation treatment, and then is subjected to filter material loading and coating treatment under the same conditions as those in the example 1, so that different multifunctional catalytic filter materials are obtained. Then different multifunctional catalytic filter materials, fresh catalyst and waste denitration catalyst are added at the airspeed of 300000s-1And introducing standard SCR reaction atmosphere at 150-250 ℃ respectively: 500ppmNO, 500ppmNH3、5％O2And N2Introducing a rapid SCR reaction atmosphere at 180-250 ℃: 250ppmNO, 250ppmNO2、500ppmNH3、5％O2And N2The temperature-programmed test was carried out for the catalytic efficiency of the different catalysts, and the results are shown in fig. 4.
In FIG. 4, V-P-S corresponds to the standard SCR reaction and V-P-F corresponds to the rapid SCR reaction. From the analysis in fig. 4, it can be seen that the catalytic efficiency of the multifunctional catalytic filter material obtained after the activation treatment, the filter material loading and the coating treatment is increased along with the increase of the concentration of the ammonium metavanadate impregnation solution, and at 150 to 250 ℃, the catalytic activity of the multifunctional catalytic filter material is higher than that of a fresh catalyst, and at 230 ℃, the NOx conversion rate in the multifunctional catalytic filter material is 46.7% and is higher than 38.2% of that of the fresh catalyst in the standard SCR reaction atmosphere. When the concentration of ammonium metavanadate is 1 wt%, the catalytic efficiency of the multifunctional catalytic filter material after dipping activation treatment, filter material loading and coating treatment in the rapid SCR reaction atmosphere can reach 93.3%, which is 88.9% higher than that of a fresh catalyst, and the catalytic efficiency is almost the same as that (94.1%) of the multifunctional catalytic filter material after the ammonium metavanadate concentration is 2 wt% after activation treatment, filter material loading and coating treatment. Therefore, the filter material loading and coating treatment can further improve the catalytic efficiency of the reprocessed waste denitration catalyst, and when the concentration of ammonium metavanadate is continuously increased, the catalytic efficiency is not greatly changed.
In summary, the resource utilization process of the waste denitration catalyst is different from a wet method, a dry method or a dry-wet combined method for recovering the waste catalyst, valuable metals on the waste catalyst do not need to be leached and recovered one by one, and a large amount of acid and alkali does not need to be used for soaking and precipitationThe agent is precipitated, and has the advantages of small acid and alkali dosage, less waste liquid generation, simple steps, easy operation, low treatment cost and the like. According to the regeneration treatment method for the waste denitration catalyst, only dust and toxic impurities on the surface of the waste catalyst need to be removed in the treatment process, and XRF (X-ray fluorescence) characterization test proves that the V loss of 50% of the waste vanadium-tungsten-titanium mixed carrier type catalyst is about 50% in the operation abrasion and water washing processes2O5And WO to3And TiO2The content is basically unchanged, so that most valuable metal resources such as vanadium, tungsten, titanium or molybdenum can be recovered. The catalytic activity of the reprocessed waste denitration catalyst is obviously recovered, and the NOx conversion rate is<After 10% of the waste catalyst is subjected to regeneration treatment, the NOx conversion rate can be recovered to 93.6% at 350 ℃ and recovered to 98.5% of that of a fresh catalyst, and the catalytic activity of the regenerated waste denitration catalyst is even higher than that of the fresh catalyst at 150-250 ℃. According to the resource utilization process for the waste denitration catalyst, the adopted fiber sheet material is suitable for a medium-low temperature interval, and the adopted ceramic sheet material is suitable for a high-temperature interval, so that the resource utilization process has the advantage of strong universality. According to the resource utilization process of the waste denitration catalyst, polytetrafluoroethylene, a foaming agent, a thickening agent and water are mixed and coated to form the microporous layer, and the process has the advantages of being strong in filtering capacity, high in heat resistance, strong in corrosion resistance, strong in flame retardance and the like. The resource utilization process of the waste denitration catalyst reduces the environmental protection treatment cost of the waste catalyst, realizes the reutilization of valuable metal resources such as vanadium, tungsten and titanium and the like, widens the catalytic activity interval of the front-end denitration reactor, prolongs the service life of the catalyst, saves the purchase cost of fresh catalyst, has important practical value and significance for cost saving and high-efficiency emission reduction of industrial kilns, and is suitable for popularization and application.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A resource utilization process of waste denitration catalyst is characterized by comprising the following steps,
pretreatment: carrying out dust removal, water washing, acid washing and grinding on the waste denitration catalyst;
activation treatment: placing the ground waste denitration catalyst into an active impregnation liquid for activation treatment, and then drying and calcining to obtain a retreated waste denitration catalyst;
loading a filter material: grinding the waste denitration catalyst, adding the ground waste denitration catalyst into ethanol to prepare a suspension, adding a fiber sheet or a ceramic sheet, stirring, dipping, drying and calcining to form a catalytic filter material;
coating treatment: mixing and stirring Polytetrafluoroethylene (PTFE), a foaming agent, a thickening agent and water, coating the mixture on the surface of a catalytic filter material to form a microporous layer, drying and calcining to obtain the multifunctional catalytic filter material.
2. The resource utilization process of the waste denitration catalyst according to claim 1, wherein the waste denitration catalyst is an irreversible deactivated vanadium-titanium based denitration catalyst.
3. The resource utilization process of the waste denitration catalyst according to claim 1, wherein the active impregnation liquid is one or more aqueous solutions of ammonium metavanadate, ammonium n-vanadate, ammonium metatungstate, ammonium paratungstate and ammonium molybdate.
4. The resource utilization process of the waste denitration catalyst according to claim 1, wherein the fiber sheet in the filter material load is a polyimide (P84) fiber sheet or a polyphenylene sulfide (PPS) fiber sheet.
5. The resource utilization process of the waste denitration catalyst according to claim 1, wherein the ceramic sheet in the filter material load is a silicon carbide microporous ceramic sheet or a cordierite honeycomb ceramic sheet.
6. The resource utilization process of the waste denitration catalyst according to claim 1, wherein the mass ratio of Polytetrafluoroethylene (PTFE), the foaming agent, the thickening agent and water is 1: 0.1-0.75: 0.075-0.125: 1.
7. The resource utilization process of the waste denitration catalyst according to claim 6, wherein the foaming agent is Azodimethylamide (AC), alkyl glycoside (APG) or sodium dodecyl sulfate; the thickening agent is hydroxyethyl cellulose.
8. The resource utilization process of the waste denitration catalyst according to claim 1, wherein in the coating treatment, the thickness of the microporous layer is 0.05-0.5 mm.
9. A multifunctional catalytic filter material prepared by the resource utilization process as claimed in any one of claims 1 to 8.
10. The use of the multifunctional catalytic filter material prepared by the resource utilization process of any one of claims 1 to 8 in a dust remover or a filter.
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