CN104275178B - The reclaiming method of discarded SCR denitrating catalyst and regeneration SCR catalyst carrier - Google Patents
The reclaiming method of discarded SCR denitrating catalyst and regeneration SCR catalyst carrier Download PDFInfo
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- CN104275178B CN104275178B CN201410483299.0A CN201410483299A CN104275178B CN 104275178 B CN104275178 B CN 104275178B CN 201410483299 A CN201410483299 A CN 201410483299A CN 104275178 B CN104275178 B CN 104275178B
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Abstract
The invention discloses a kind of reclaiming method and regeneration SCR catalyst carrier of discarded SCR denitrating catalyst. The reclaiming method of described discarded SCR denitrating catalyst, be by catalyst after preliminary treatment, add metatitanic acid to produce in the production technology of titanium dioxide, remove the harmful components in discarded catalyst, retain the active ingredient in catalyst, thereby obtain a kind of reclaiming method of low-cost environmental-protecting, and the impact of performance of catalyst carrier each side of regeneration all can reach the standard of preparation SCR catalyst, there is good performance.
Description
Technical field
The invention belongs to recovery and the regeneration field of denitrating catalyst, particularly, relate to a kind of discarded SCR denitrating catalystLow-cost environmental-protecting reclaiming method and the regeneration SCR catalyst carrier being made by it.
Background technology
Along with PM2.5 is more and more serious on the impact of environment, people to produce PM2.5 flue gas, vehicle exhaust etc. because ofElement is also more and more paid close attention to, and since 12, China is more and more stricter to the control of nitrogen oxide (NOx) discharge, selective catalysisReduction (SCR) denitration technology is efficient because having, denitration performance is widely used in the denitrating system of coal-burning power plant reliably. SCRThe principle of denitration technology is to spray into NH in boiler emission flue gas3Deng reducing agent, these reducing agents under the effect of catalyst withNOx in flue gas reacts and generates harmless nitrogen G&W. The core of SCR denitration technology is SCR catalyst, typical commercialSCR catalyst is with TiO2For carrier, with V2O5-WO3(MoO3) etc. metal oxide containing precious metals be active component. SCR denitrating catalystMode of appearance has honeycomb fashion, flat and corrugated plate dst.
In use, meeting is due to 1 for SCR catalyst) long-term under more than 300 DEG C hot conditions, cause catalysisGrowing up of agent crystalline size, specific area reduces, and reduces catalytic effect until lost efficacy; 2) alkali metal, alkaline-earth metal, arsenic etc. haveAdhering to for a long time of evil element, cause catalyst poisoning; 3) catalyst is in running, duct of cigarette ash blocking catalyst etc.Reason, all can cause the inefficacy of SCR catalyst and scrap, and makes the service life of catalyst generally at 2-4; And discarded urgingAgent is if carried out effective recycling, on the contrary can be harmful and environment is caused to secondary pollution; Along with SCR catalystWidely apply, China is about to welcome a peak of eliminating discarded catalyst; Therefore the regeneration of the discarded SCR denitrating catalyst of researchThere are reality and economic meaning with recycling.
A large amount of document demonstrations, China, to discarding the research of SCR catalyst, mainly concentrates on the recovery profit of following two aspectsWith the 1. on-line regeneration of catalyst, that is, to catalyst simply wash or pickling after, again put into production in line; 2. uselessAbandon the separation completely of catalyst and recycle, that is, the metal ion in discarded catalyst is divided separately as compositions such as vanadium, tungsten, molybdenumsAfter purifying, again recycle. These methods, if it were not for cost is high, are exactly that experimental technique is tediously long, and actual value is not high;And inventor is devoted to the production research of catalysis titanium white, from the angle of manufacturing enterprise, propose to retain having in discarded catalystEffect composition, and new method is recycled in a kind of environmental protection that only separates the harmful substance in discarded catalyst cheaply, obtainsGood effect.
Application number is the reclaiming that discloses a kind of discarded SCR catalyst in the patent application of CN201410084780.2Method, the method will be discarded SCR catalyst after blowing ash, cleaning and dry pretreatment, be ground into powder, and and calcium carbonate mixingEvenly, then carry out roasting. Roasting material adds dilution heat of sulfuric acid after again pulverizing, and uses ammoniacal liquor to regulate pH value to 8-11, filtersIsolate titaniferous filter residue, and be recycled liquid. The SCR catalyst block of inactivation, after blowing ash, cleaning and dry pretreatment, is soakedSteep in reclaiming liquid, the block after immersion, through super-dry, is put into the Muffle furnace roasting of 400-600 DEG C, then obtains and recoversThe regeneration SCR catalyst of denitration activity. This patent and difference of the present invention: just will discard catalyst and remove in recovery liquidAfter evil ion, simply pass through the temperature roasting of 400-600 degree, recovered part specific area, the powder ratio that the method obtains conventionallySurface area can be very not high, and particle diameter is larger, thereby catalytic performance is not high; And the present invention will will discard catalyst through preliminaryAfter processing,, to nanoscale, add in the production technology of metatitanic acid through nanometer superfine sand mill porphyrize, fully separate be harmful to fromSon, and process washing together with metatitanic acid, bleaching, making beating, press filtration, the links such as calcining, effectively ensure diameter of particle D50With than tableThe performances such as face level are more useful, more can meet the appendix of catalyst activity composition.
Application number is the reclaiming that discloses a kind of discarded SCR catalyst in the patent application of CN201210492800.0Method, the method, just through over-blowing ash, after ball milling, is added metal oxide isoreactivity material and is made catalyst, wherein nuisanceMatter cannot be removed as sodium, potassium plasma, and ball milling can not reach effective particle diameter, and the catalyst that causes this method to be made makesShort with the life-span, catalytic capability meeting fast reducing; The present invention efficiently solves the problems referred to above.
Application number is the reclaiming that discloses a kind of discarded SCR catalyst in the patent application of CN201310434204.1Method, the method has 3 kinds of approach: the 1st, catalyst components is separated completely, again obtain independent titanium dioxide, three oxidationsThe materials such as tungsten, this route is tediously long, complicated operation, cost is high, and economic worth is low; The 2nd, through blowing ash, the dry on-line regeneration that waits, regeneratesCatalyst activity recovery capability low, and can only there is no fouled catalyst for just stopping up, the 3rd, produce rutile faceThe regeneration technology of material titanium dioxide, will discard SCR catalyst powder and be broken to 300 about orders (approximately 44 μ are m) by overpickling, washing, pressureFilter, concentrated, hydrolysis, suction filtration, bleaching, calcining etc. obtain product; But this rutile type titanium white can only be used for pigment, and can notAs the carrier of SCR catalyst.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of low cost, environmental protection discarded SCR denitrating catalyst returnReceive renovation process, the catalyst of this method reclaiming, can also be effective except can effectively improving the denitrification percent of catalystImprove the properties such as the pore volume, extrusion molding rate, scasoning check rate of catalyst.
The present invention addresses the above problem adopted technical scheme:
A reclaiming method for discarded SCR catalyst, comprises the following steps:
A. preliminary treatment: will discard SCR catalyst stand-by through pulverizing, sieve, after washing, pickling;
B. slurrying processing: above-mentioned catalyst after preliminary treatment, through wet pulverizing, grinding, is obtained to catalyst slurryBody;
C. mixed serum: above-mentioned catalyst slurry is mixed with metatitanic acid slurries, obtain mixed serum;
D. washing and bleaching: after washing, filtration, dehydration, adjusting PH, add reducing agent to float above-mentioned mixed serumIn vain;
E. finished product preparation: will add water, regulate PH through above-mentioned slurries after treatment, and add ammonium paratungstate and white carbon, and stirMix, filter, dewater, calcine, pulverize, obtain WO3-SiO2-TiO2Composite powder.
A reclaiming method for discarded SCR catalyst, comprises the following steps:
A. preliminary treatment: will discard SCR catalyst stand-by through pulverizing, sieve, after washing, pickling;
B. slurrying processing: above-mentioned catalyst after preliminary treatment, through wet pulverizing, grinding, is obtained to catalyst slurryBody, in this slurry, the diameter of catalyst is 20-100nm;
C. mixed serum: above-mentioned catalyst slurry is mixed with metatitanic acid slurries, obtain mixed serum;
D. washing and bleaching: after washing, filtering means dehydration obtains filter cake by above-mentioned mixed serum, regulates PH to 1.5-2.0, add water, titanous reducing agent, under the condition of 90 DEG C, reaction, to after completing, is cooled to room temperature;
E. finished product preparation: by adding water to titanium dioxide through above-mentioned slurries after treatment and account for the 23wt% of slurries, regulate PH extremely7.5-8.0, add ammonium paratungstate to WO3Content be 5wt%, add white carbon to SiO2Content be 5wt%, stir, filter,Dehydration, calcining, pulverizing, obtain WO3-SiO2-TiO2Composite powder, wherein, described WO3Content refer to described WO3Quality account forWO3-SiO2-TiO2The ratio of composite powder quality, described SiO2Content refer to described SiO2Quality account for WO3-SiO2-TiO2The ratio of composite powder quality.
Wherein, in described a. preliminary treatment step, adopt certain methods well-known to those skilled in the art to discarded SCRCatalyst carries out preliminary cleaning, more specifically can comprise the following steps: 1. pulverize: with blade type or hammer crushing crusher machineCatalyst, obtaining diameter is the fragment of 0.5-1cm left and right; 2. sieve: the fragment after above-mentioned pulverizing is crossed to 50-80 object sieve; 3.Washing: by the catalyst after sieving add water flushings, filtration, to remove the cigarette ash such as carbon deposit, metal deposit of catalyst surface; 4.Pickling: by through washing after catalyst be soaked in 1-2 hour in acid solution, wherein, this acid solution can be sulfuric acid orNitric acid, concentration is 0.5-1M. Pickling can remove infiltration or be attached to alkali metal on discarded SCR catalyst, alkaline-earth metal, arsenic,Or phosphorus etc.
Wherein, in described b. slurrying treatment step, the concentration of described catalyst slurry is 26-30wt%.
Wherein, in described b. slurrying treatment step, it is 20-100nm that catalyst is ground to diameter, makes the chi of this catalystThe crystalline size of the metatitanic acid in the metatitanic acid slurries that need to mix in very little and following c. mixed serum step is close, thereby makesDescribed catalyst slurry and metatitanic acid slurries merge completely, make follow-up d. washing and blanching step and e. finished product preparation processBetter processing effect, the SCR catalyst carrier properties finally making is good, and the catalyst being made by this carrier also hasGood performance. This catalyst particle size can also be ground to 30-80nm, further preferred 30-50nm.
Wherein, in described c. mixed serum step, in metatitanic acid slurries, the content of titanium dioxide is 190-230g/l.
Wherein, in described c. mixed serum step, the mass ratio that catalyst slurry mixes with metatitanic acid slurries is 1:9-1:1。
Wherein, in described d. washing and blanching step, following twice washing of described mixed serum process: once wash 1.5Hour; After press filtration, carry out intermediate water and wash, wash 3 hours, until the ferrous ion in mixed serum is cleaned complete.
Wherein, in described d. washing and blanching step, can add sulfuric acid to regulate PH to 1.5-2.0. This sulfuric acid is except canBe used for regulating outside PH, can also further remove sodium ion, the potassium ion etc. in catalyst.
Wherein, in described d. washing and blanching step, the concentration that regulates mixed serum after adding water is 30wt%.
Wherein, described d. washing includes but not limited to titanium sulfate with the titanous reducing agent in blanching step.
Wherein, in described e. finished product preparation process, can add ammoniacal liquor to regulate PH to 7.5-8.0.
Wherein, in described e. finished product preparation process, slurries obtain filter cake after filtering means dehydration, titanium dioxide in this filter cakeContent be 44-46wt%.
Wherein, in described e. finished product preparation process, the calcining of filter cake is calcined being no more than under 550 DEG C of temperature conditions.
A kind of regeneration SCR catalyst carrier being made by the reclaiming method of above-mentioned discarded SCR catalyst. , this timeReceive the WO that renovation process makes3-SiO2-TiO2Composite powder can be used as the carrier of SCR catalyst, and the SCR being made by this carrier urgesPore volume, extrusion molding rate, horizontal mechanical strength, longitudinal mechanical strength, scasoning check rate and the wear rate of agent all can reachTo good level.
Wherein, the SCR catalyst carrier that the method for the invention makes, will discard SCR catalyst after preliminary treatment,Add metatitanic acid to produce in the production technology of titanium dioxide, continue on the one hand to remove the objectionable impurities in discarded catalyst, the opposing partyFace will be discarded catalyst powder and be broken to 20-100nm(, be close with the crystalline size of metatitanic acid), make catalyst slurry and inclined to one side titaniumWintercherry liquid merges completely, makes subsequent step obtain better effect, adds active ingredient, and SCR catalyst obtained by this method carriesThe SCR catalyst that body and this carrier make, crystalline size, specific area, scasoning check rate, longitudinal mechanical strength, laterally mechanicalThe function admirables such as intensity, wear rate, denitrification percent.
To sum up, the reclaiming method of discarded SCR catalyst of the present invention has following beneficial effect:
1. after the catalyst slurry that particle diameter is 20-100nm is mixed in metatitanic acid slurries, through washing step, Neng GouzaiFree acid and other impurity of the discarded catalyst of inferior effective separation, can effectively meet catalyst through techniques such as bleaching, calciningsEvery technical requirement of carrier titanium dioxide;
2. a discarded catalyst recovery renovation process, does not need the various compositions of complete separating catalyst, has just removedThe harmful substance of catalyst, and retained active ingredient titanium dioxide and active component WO3、V2O5Deng, as one of raw materials for productionPart, had both recycled discarded catalyst, had reduced again production cost, did not produce the new three wastes; Therefore, this method be can yet be regarded asThe new method of discarded SCR catalyst is recycled in a kind of environmental protection of high efficiency, low cost;
3. the laser particle D50 of the SCR catalyst carrier obtaining by reclaiming method of the present invention and ratio tableArea all meets standard-required, and the catalyst being made by this carrier not only can effectively improve denitrification percent, meets catalystOutside indices, can also effectively improve pore volume, extrusion molding rate, the horizontal mechanical strength, longitudinally mechanical of catalystIntensity, reduces scasoning check rate and wear rate.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is done to detailed description further, but embodiments of the present invention are not limited toThis.
The catalyst making in following examples of the present invention and comparative example and the test of the properties of carrier thereof all adopt markStandard is carried out performance test, concrete as employing professional standard HG/T4525-2013; Catalyst titanium dioxide.
Embodiment 1
Take 25 kilograms of discarded catalyst, be broken into the fractionlet of 0.5-1cm through plastic breaker, cross 50 order reciprocating sieves,And the flushing dust that adds water, by the catalyst debris of rinsing well, putting into rare nitric acid that 60 kilograms of concentration are 1M, to soak 1-2 littleTime, after filtration, through pulverizer wet pulverizing, adding water 50 kilograms, catalyst slurry bulk concentration is controlled at 26wt%, enters sand mill ultra-finePulverize, it is qualified at 20-50nm that sampling detects particle diameter; Defective secondary making beating;
The ratio that catalyst slurry after particle diameter is qualified is 1:1 with metatitanic acid slurries according to mass ratio is mixed, this metatitanic acidTiO in slurries2Content is 190g/l, once washes 1.5 hours, carries out intermediate water and wash after press filtration, washes after 3 hours, getsA small amount of filtrate is detected with 1% potassium ferricyanide solution, represents cleaned while being yellow; Cleaned filter cake is put into Bellmer, add sulphurSour approximately 60 liters are adjusted to 1.5 by the pH value of slurries, add 30 kilograms of pure water, adjust the about 30wt% of slurry concentration, add titanous reducing agent(titanium sulfate) approximately 1 kilogram, controls 90 DEG C of reduction temperatures, is incubated 1 hour, is cooled to room temperature;
Above-mentioned slurries are added to the tank of sizing mixing, add pure water to titanium dioxide and account for about 23wt% of total slurries, add ammoniacal liquor and adjust PH to be7.5, add para-tungstic acid amine and White Carbon black, addition meets respectively following requirement: WO3Content accounts for the 5wt% of titanium tungsten composite powder, SiO2Content accounts for the 5wt% of titanium tungsten composite powder; Stir 30min, opening press filter filters, and filter cake, containing titanium dioxide 44wt%, enters rotary kiln calcining,High-temperature region temperature is controlled at and is no more than 550 DEG C, calcine complete, enter pulverizer pulverize, obtain titanium tungsten composite powder (, WO3-SiO2-TiO2Composite powder), the discarded catalyst that test the present embodiment uses and the properties of titanium tungsten composite powder are also recorded in table 1.
This titanium tungsten composite powder is prepared into catalyst, can adopts in prior art and arbitrarily titanium tungsten composite powder is prepared into and be urgedThe method of agent, shown in the embodiment 5 in the patent application that is CN201210243571 with reference to application number in the present embodiment by titaniumTungsten powder is prepared into the mode of SCR catalyst to be prepared, and detects catalyst properties and be recorded in table 2.
Embodiment 2
Take 25 kilograms of discarded catalyst, be broken into the fractionlet of 0.5-1cm through plastic breaker, cross 50 order reciprocating sieves,And the flushing dust that adds water, by the catalyst debris of rinsing well, putting into rare nitric acid that 60 kilograms of concentration are 1M, to soak 1-2 littleTime, after filtration, through pulverizer wet pulverizing, add water and regulate catalyst slurry bulk concentration to be controlled at 30wt%, enter sand mill superfine powderBroken, it is qualified at 50-100nm that sampling detects particle diameter; Defective secondary making beating;
The ratio that catalyst slurry after particle diameter is qualified is 1:9 with metatitanic acid slurries according to mass ratio is mixed, this metatitanic acidTiO in slurries2Content is 230g/l, once washes 1.5 hours, carries out intermediate water and wash after press filtration, washes after 3 hours, getsA small amount of filtrate is detected with 1% potassium ferricyanide solution, represents cleaned while being yellow; Cleaned filter cake is put into Bellmer, add sulphurAcid regulates the pH value to 2.0 of slurries, adds 30 kilograms of pure water, adjusts the about 30wt% of slurry concentration, adds titanous reducing agent (titanium sulfate) approximately1 kilogram, control 90 DEG C of reduction temperatures, be incubated 1 hour, be cooled to room temperature;
Above-mentioned slurries are added to the tank of sizing mixing, add pure water to titanium dioxide and account for about 23wt% of total slurries, add ammoniacal liquor and adjust PH to be8.0, add para-tungstic acid amine and White Carbon black, addition meets respectively following requirement: WO3Content accounts for the 5wt% of titanium tungsten composite powder, SiO2Content accounts for the 5wt% of titanium tungsten composite powder; Stir 30min, opening press filter filters, and filter cake, containing titanium dioxide 46wt%, enters rotary kiln calcining,High-temperature region temperature is controlled at and is no more than 550 DEG C, calcines completely, enters pulverizer and pulverizes, and obtains titanium tungsten composite powder and according to embodiment's 1Mode is prepared into SCR catalyst, detects carrier titanium tungsten composite powder and catalyst properties and is recorded in respectively in table 1 and table 2.
Comparative example 1
Adopt the raw material identical with embodiment 1 and processing method to carry out reclaiming to discarded catalyst, this comparative example 1 withThe difference of embodiment 1 is only, in catalyst slurry, the diameter of catalyst particle is 450nm.
Comparative example 2
Adopt the raw material identical with embodiment 1 and processing method to carry out reclaiming to discarded catalyst, this comparative example 1 withThe difference of embodiment 1 is only, in catalyst slurry, the diameter of catalyst particle is 260nm.
Wherein, " agreement " in upper table 1 represents that this specific area there is no clear and definite its critical field, normally, and this specific surfaceLong-pending value is larger, and the performance of catalyst carrier is better.
By the embodiment 1-2 in upper table 1-2, can find out, the SCR catalyst carrier that adopts this method to prepare, harmfulImpurity content is effectively rejected, and meets the demands, and the indexs such as crystalline size and specific area reach the requirement of SCR catalyst carrier;The catalyst nitric efficiency of preparing with this, intensity etc. can meet the requirement of SCR catalyst, and this method be can yet be regarded as a kind of discardedThe good method that SCR catalyst economy recycles efficiently.
Compare by embodiment 1 and comparative example 1-2, can find out, catalyst is ground in scope of the present invention,That is, after 20-100nm, then be mixed with titanium tungsten composite powder with metatitanic acid slurries, its laser particle D50 and specific area are all more rightRatio 1-2(catalyst particle size is not within the scope of 20-100nm) titanium tungsten composite powder good. And, on the basis of this carrier, adoptMake SCR catalyst by identical method, the properties of the SCR catalyst being made by embodiment 1 is also obviously better than comparative exampleThe properties of the SCR catalyst that 1-2 makes.
And conventionally discarded SCR catalyst is carried out after preliminary treatment in prior art, the 1st, by means such as bleaching, calciningsDirectly obtain catalyst, the 2nd, reclaim the means such as liquid, roasting by immersion and recover the activity of catalyst, the former is normally to catalysisAgent is crushed to hundreds of object degree, is conventionally crushed to micron level, and the latter directly removes catalyst to have in recovery liquid, there is not the pulverizing of catalyst in evil ion.
And the inventor is being mixed with catalyst slurry after treatment and metatitanic acid slurries titanium tungsten composite powderIn process, find, the particle diameter of catalyst in the time mixing with metatitanic acid has larger shadow to the performance of Kaolinite Preparation of Catalyst carrier and catalystRinging, as above show the same of the data demonstration shown in 1-2, is catalyst slurry and the metatitanic acid slurry within the scope of 20-100nm at particle diameterTitanium tungsten composite powder and catalyst that liquid is mixed with, it is optimum that its properties just can reach.
As mentioned above, can realize preferably the present invention.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, complies withAccording to technical spirit of the present invention, within the spirit and principles in the present invention, any simple amendment that above embodiment is done,Be equal to replacement and improvement etc., within all still belonging to the protection domain of technical solution of the present invention.
Claims (9)
1. a reclaiming method for discarded SCR catalyst, is characterized in that, comprises the following steps:
A. preliminary treatment: will discard SCR catalyst stand-by through pulverizing, sieve, after washing, pickling;
B. slurrying processing: above-mentioned catalyst after preliminary treatment, through wet pulverizing, grinding, is obtained to catalyst slurry,In this slurry, the diameter of catalyst is 20-100nm;
C. mixed serum: above-mentioned catalyst slurry is mixed with metatitanic acid slurries, obtain mixed serum;
D. washing and bleaching: after washing, filtering means dehydration obtains filter cake by above-mentioned mixed serum, regulates pH to 1.5-2.0, addsEnter water, titanous reducing agent, under the condition of 90 DEG C, reaction, to after completing, is cooled to room temperature;
E. finished product preparation: by adding water to titanium dioxide through above-mentioned slurries after treatment and account for the 23wt% of slurries, regulate pH to 7.5-8.0, add ammonium paratungstate to WO3Content be 5wt%, add white carbon to SiO2Content be 5wt%, through stirring, filter, de-Water, calcining, pulverizing, obtain WO3-SiO2-TiO2Composite powder, wherein, described WO3Content refer to described WO3Quality account for WO3-SiO2-TiO2The ratio of composite powder quality, described SiO2Content refer to described SiO2Quality account for WO3-SiO2-TiO2CompoundThe ratio of opaque amount.
2. the reclaiming method of discarded SCR catalyst according to claim 1, is characterized in that, described b. slurrying placeIn reason step, the concentration of described catalyst slurry is 26-30wt%.
3. the reclaiming method of discarded SCR catalyst according to claim 2, is characterized in that, described c. mixes slurryIn liquid step, in metatitanic acid slurries, the content of titanium dioxide is 190-230g/L.
4. the reclaiming method of discarded SCR catalyst according to claim 3, is characterized in that, described c. mixes slurryIn liquid step, the mass ratio that catalyst slurry mixes with metatitanic acid slurries is 1:9-1:1.
5. according to the reclaiming method of the discarded SCR catalyst described in any one in claims 1 to 3, it is characterized in that instituteState in d. washing and blanching step, the concentration that regulates mixed serum after adding water is 30wt%.
6. according to the reclaiming method of the discarded SCR catalyst described in any one in claims 1 to 3, it is characterized in that instituteState in d. washing and blanching step, titanous reducing agent includes but not limited to titanium sulfate.
7. according to the reclaiming method of the discarded SCR catalyst described in any one in claims 1 to 3, it is characterized in that instituteState in e. finished product preparation process, slurries obtain filter cake after filtering means dehydration, and in this filter cake, the content of titanium dioxide is 44-46wt%。
8. according to the reclaiming method of the discarded SCR catalyst described in any one in claims 1 to 3, it is characterized in that instituteStating a. preliminary treatment step is specially: be that diameter is the fragment of 0.5-1cm by catalyst breakage; Cross 50-80 object sieve; Punching adds waterWash, filter; Catalyst after washing is soaked in to 1-2 hour in acid solution, and wherein, this acid solution can be sulfuric acidOr nitric acid, concentration is 0.5-1M.
9. the regeneration being made by the reclaiming method of the discarded SCR catalyst described in any one in claim 1 to 8SCR catalyst carrier.
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| CN106319223B (en) * | 2015-06-29 | 2018-11-13 | 马鞍山艺诚机电有限公司 | A kind of processing method of SCR denitration |
| CN106607106A (en) * | 2015-10-26 | 2017-05-03 | 浙江浙能技术研究院有限公司 | Activity regenerating and performance optimizing method of SCR catalyst for sulfur, arsenic and phosphorus poisoning |
| CN108525709B (en) * | 2018-03-30 | 2021-05-18 | 国家电投集团远达环保催化剂有限公司 | Method for recycling waste SCR denitration catalyst and regenerated SCR denitration catalyst carrier powder |
| CN109225260B (en) * | 2018-08-01 | 2021-11-05 | 北京工业大学 | Regeneration method of Ce-based SCR denitration catalyst for sulfur poisoning |
| CN112279299A (en) * | 2020-10-30 | 2021-01-29 | 甘肃盈华环保科技有限公司 | Method for increasing titanium dioxide content in titanium dioxide |
| CN114733502A (en) * | 2022-04-20 | 2022-07-12 | 河北威达蓝海环保科技股份有限公司 | Regeneration treatment process for titanium dioxide carrier raw material of waste reduction denitration catalyst in wide temperature range |
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| CN103526031A (en) * | 2013-10-09 | 2014-01-22 | 北京科技大学 | Recovery method for SCR waste flue gas denitration catalyst |
| CN103846112A (en) * | 2014-03-10 | 2014-06-11 | 北京国电龙源环保工程有限公司 | Method for regenerating denitration catalyst by utilizing waste SCR (Selective Catalytic Reduction) catalyst recovery liquid |
| CN103849774A (en) * | 2014-03-10 | 2014-06-11 | 北京国电龙源环保工程有限公司 | Method for recycling waste SCR (Selective Catalytic Reduction) catalyst |
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Application publication date: 20150114 Assignee: Jiangsu Longqing Environmental Technology Co., Ltd Assignor: PANZHIHUA ZHENGYUAN TECHNOLOGY Co.,Ltd. Contract record no.: X2020320000005 Denomination of invention: Method for recycling waste SCR denitration catalyst and regenerated SCR catalyst carrier Granted publication date: 20160518 License type: Common License Record date: 20200319 |