CN104190405B - A kind of calendering process of SCR honeycomb denitrating catalyst - Google Patents
A kind of calendering process of SCR honeycomb denitrating catalyst Download PDFInfo
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- CN104190405B CN104190405B CN201410353423.1A CN201410353423A CN104190405B CN 104190405 B CN104190405 B CN 104190405B CN 201410353423 A CN201410353423 A CN 201410353423A CN 104190405 B CN104190405 B CN 104190405B
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Abstract
The invention discloses a kind of calendering process of SCR honeycomb denitrating catalyst, comprise that preparing raw material, low temperature stirs major ingredient, high-temperature stirring and regulate water content and pH value, low temperature to stir auxiliary material and control water content and the five steps such as pH value, high-temperature stirring adjusting water content and pH value, finally obtains the mixing materials of SCR honeycomb denitrating catalyst. The present invention is in mixing process, the mode that adopts segmentation to stir, low temperature stirs and high-temperature stirring cross-reference, and control curing temperature, water content, the pH value of mixing materials, thereby ensure the plasticity of mixing materials, make the mixing materials plasticity obtaining reach 250～300, greatly shorten mixing cycle simultaneously, improve yield rate, the cracking of the mixing materials that effectively prevents honeycomb catalyst in follow-up dry, calcination process improves compression strength and the wear resistance of finished product simultaneously.
Description
Technical field
The invention belongs to catalyst technical field, relate to a kind of calendering process of SCR honeycomb denitrating catalyst.
Background technology
Nitrogen oxide (NOX) be one of main atmosphere pollution, comprise NO, NO2Etc. the oxygen of multiple nitrogenCompound, all can cause certain injury to health and animals and plants existence, as formed acid rain, photochemistry cigaretteMist etc., but also can produce multiple secondary pollution. In environmental consciousness with require more and more stronger today, asThe discharge what removes nitrogen oxide, becomes more and more urgent problem. At present, the nitrogen oxide of China is mainProduce legacy cellular denitrating catalyst TiO from coal combustion and industrial smog discharge2Make carrier, V2O5LiveProperty component, WO3Make heat stabilizer, then add some shaping assistants, by wet mixing, in mixer, stirEvenly.
Application number is that 201110056859.0 Chinese patent discloses a kind of catalytic agent for denitrating smoke and system thereofStandby technique, just simply by titanium dioxide, tungstic acid, vanadic anhydride, organic binder bond, glass fibersThe mixing such as dimension, then add water, plasticizer etc. to stir, this technique mixing time is long, simultaneously honeycomb catalysisAgent easy cracking in follow-up dry, calcination process, yield rate is low, causes the mechanical performance of catalyst simultaneously,As compression strength and wear-resistant loss rate deficiency, cannot meet the service life of 24000h.
Summary of the invention
Technical problem to be solved by this invention is just to provide a kind of mixing work of SCR honeycomb denitrating catalystSkill, can shorten mixing cycle, improves yield rate, effectively prevents that honeycomb catalyst is dried, calcined follow-upCracking in journey improves compression strength and the wear resistance of finished product simultaneously.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of SCR honeycomb denitration catalystThe calendering process of agent, comprises the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricatedAgent 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate(DOP) or dibutyl phthalate (DBP), binding agent is polyvinyl alcohol, carboxylic propyl methocelIn one or both;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, stirSpeed is 80～120r/min, and mixing time is 10～15min; First adopt low temperature to stir titanium dioxide, threeThe major ingredient such as tungsten oxide, silica flour stirs.
Step 3: add successively lubricant, continue to stir, mixing speed is 400～600r/min, when stirringBetween be 5～10min, then add a part of water, regulate water content to 36～38%, then add a partAmmoniacal liquor regulates pH value to 8～9, and system temperature is 40～60 DEG C; Add water and ammoniacal liquor to distinguish regulation systemWater content and pH value, and be warming up to uniform temperature, coordinate high-speed stirred, be conducive to the mixing of raw material.
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, stir speedDegree is 80～120r/min, and mixing time is 5～10min, regulates water content to 40～45%, system temperatureIt is 50～55 DEG C; Again adopt low temperature to stir, by auxiliary materials such as ammonium metavanadate aqueous solution, plasticizer, binding agentsStir together with major ingredient, and strictly control water content and temperature, the plasticity that is conducive to mixing materials is improved,The cracking of the mixing materials that effectively prevents honeycomb catalyst in follow-up dry, calcination process, improves yield rate.
Step 5: open air bleeding valve, continue to stir, mixing speed is 400～600r/min, and mixing time is25～30min, then adds ammoniacal liquor and the water of surplus, and regulating water content is that 30～35%, pH value is 7～8,And temperature is controlled to 85～90 DEG C, obtain the mixing materials of SCR honeycomb denitrating catalyst. Again adopt high temperatureStir, and control curing temperature and the water content of mixing materials, by adding the pH value of ammoniacal liquor regulation system,Finally obtain the mixing materials of excellent performance.
Preferably, add a part of ammoniacal liquor to regulate pH value to 8.2 in step 3, system temperature is 45～48 DEG C.PH value is 8.2, temperature is while approaching 48 DEG C, and the time of high-temperature stirring can shorten to 5min left and right, and lubricatesThe effect of agent can reach more satisfactory state.
Preferably, regulate water content to 40～42% in step 4, system temperature is 50～53 DEG C. Water contentApproach 42%, temperature is while approaching 53 DEG C, the pore producing in follow-up dry, the calcination process of mixing materials is not allowedEasily stop up, be more conducive to improve the catalytic effect of catalyst finished product.
Preferably, in step 5, regulating water content is that 30～32%, pH value is 7.7, and temperature is controlled at85～88 DEG C. Water content approaches 32%, pH value is 7.7, temperature is while approaching 88 DEG C, except mixing materials is producedOutside the finished product compression strength obtaining and wear resistance obviously improve, and mixing materials discharging is easier, remnantsMaterial still less, reduces clout waste, and time saving and energy saving, reduces labor intensity.
Compared with prior art, advantage of the present invention is: in mixing process, and the mode that adopts segmentation to stir,Low temperature stirs and high-temperature stirring cross-reference, controls curing temperature, water content, the pH value of mixing materials, therebyThe plasticity that ensures mixing materials, makes the mixing materials plasticity obtaining reach 250～300, greatly shortens and stirs week simultaneouslyPhase, improve yield rate, the mixing materials that effectively prevents honeycomb catalyst opening in follow-up dry, calcination processSplit, improve compression strength and the wear resistance of finished product simultaneously.
Below in conjunction with detailed description of the invention, the invention will be further described:
Detailed description of the invention
The calendering process embodiment 1 of a kind of SCR honeycomb of the present invention denitrating catalyst, comprises the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricatedAgent 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate(DOP) or dibutyl phthalate (DBP), binding agent is polyvinyl alcohol, carboxylic propyl methocelIn one or both;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, stirSpeed is 100r/min, and mixing time is 15min; First adopt low temperature stir by titanium dioxide, tungstic acid,The major ingredients such as silica flour stir.
Step 3: add successively lubricant, continue to stir, mixing speed is 500r/min, and mixing time is10min, then adds a part of water, regulates water content to 36～38%, then adds a part of ammoniacal liquor to regulatePH value to 9, system temperature is 40～45 DEG C; Add water and ammoniacal liquor to distinguish water content and the pH of regulation systemValue, and be warming up to uniform temperature, coordinate high-speed stirred, be conducive to the mixing of raw material.
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, stir speedDegree is for 100r/min, and mixing time is 10min, regulates water content to 40～45%, and system temperature is 50～55 DEG C; Again adopt low temperature to stir, by auxiliary material and major ingredients such as ammonium metavanadate aqueous solution, plasticizer, binding agentsStir together, and strictly control water content and temperature, the plasticity that is conducive to mixing materials is improved, effectively anti-Only the cracking of the mixing materials of honeycomb catalyst in follow-up dry, calcination process, improves yield rate.
Step 5: open air bleeding valve, continue to stir, mixing speed is 500r/min, and mixing time is 30min,Then add ammoniacal liquor and the water of surplus, regulating water content is that 30～35%, pH value is 7, and by temperature controlAt 85～90 DEG C, obtain the mixing materials of SCR honeycomb denitrating catalyst. Again adopt high-temperature stirring, and controlThe curing temperature of mixing materials processed and water content, by adding the pH value of ammoniacal liquor regulation system, finally obtain performanceExcellent mixing materials, ensures that the plasticity of mixing materials can reach 250～300, is significantly improved than prior art,Prior art plasticity can only reach 150～200.
The calendering process embodiment 2 of a kind of SCR honeycomb of the present invention denitrating catalyst, comprises the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricatedAgent 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate(DOP) or dibutyl phthalate (DBP), binding agent is polyvinyl alcohol, carboxylic propyl methocelIn one or both;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, stirSpeed is 120r/min, and mixing time is 10min;
Step 3: add successively lubricant, continue to stir, mixing speed is 450r/min, and mixing time is5min, then adds a part of water, regulates water content to 36～38%, then adds a part of ammoniacal liquor to regulatePH value to 8.2, system temperature is 45～48 DEG C; PH value is 8.2, temperature is while approaching 48 DEG C, high-temperature stirringTime can shorten to about 5min, and the effect of lubricant can reach more satisfactory state.
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, stir speedDegree is 80r/min, and mixing time is 10min, regulates water content to 40～45%, and system temperature is 50～55 DEG C;
Step 5: open air bleeding valve, continue to stir, mixing speed is 550r/min, and mixing time is 25min,Then add ammoniacal liquor and the water of surplus, regulating water content is that 30～35%, pH value is 8, and by temperature controlAt 85～90 DEG C, obtain the mixing materials of SCR honeycomb denitrating catalyst, ensure that the plasticity of mixing materials can reach250～300, be significantly improved than prior art.
The calendering process embodiment 3 of a kind of SCR honeycomb of the present invention denitrating catalyst, comprises the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricatedAgent 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate(DOP) or dibutyl phthalate (DBP), binding agent is polyvinyl alcohol, carboxylic propyl methocelIn one or both;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, stirSpeed is 80r/min, and mixing time is 15min;
Step 3: add successively lubricant, continue to stir, mixing speed is 500r/min, and mixing time is10min, then adds a part of water, regulates water content to 36～38%, then adds a part of ammoniacal liquor to regulatePH value to 8.5, system temperature is 50～55 DEG C;
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, stir speedDegree is 120r/min, and mixing time is 5min, regulates water content to 40～42%, and system temperature is 50～53 DEG C;Water content approaches 42%, temperature is while approaching 53 DEG C, to the gas producing in follow-up dry, the calcination process of mixing materialsHole is not easy to stop up, and is more conducive to improve the catalytic effect of catalyst finished product.
Step 5: open air bleeding valve, continue to stir, mixing speed is 400r/min, and mixing time is 30min,Then add ammoniacal liquor and the water of surplus, regulating water content is that 30～35%, pH value is 8, and by temperature controlAt 85～90 DEG C, obtain the mixing materials of SCR honeycomb denitrating catalyst, ensure that the plasticity of mixing materials can reach250～300, be significantly improved than prior art.
The calendering process embodiment 4 of a kind of SCR honeycomb of the present invention denitrating catalyst, comprises the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricatedAgent 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate(DOP) or dibutyl phthalate (DBP), binding agent is polyvinyl alcohol, carboxylic propyl methocelIn one or both;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, stirSpeed is 100r/min, and mixing time is 10min;
Step 3: add successively lubricant, continue to stir, mixing speed is 500r/min, and mixing time is5min, then adds a part of water, regulates water content to 36～38%, then adds a part of ammoniacal liquor to regulatePH value to 8.2, system temperature is 45～48 DEG C;
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, stir speedDegree is for 100r/min, and mixing time is 10min, regulates water content to 40～42%, and system temperature is 50～53℃；
Step 5: open air bleeding valve, continue to stir, mixing speed is 500r/min, and mixing time is 25min,Then add ammoniacal liquor and the water of surplus, regulating water content is that 30～32%, pH value is 7.7, and by temperature controlBuilt in 85～88 DEG C, obtain the mixing materials of SCR honeycomb denitrating catalyst. Water content approaches 32%, pH valueBe 7.7, temperature is while approaching 88 DEG C, except mixing materials, to produce the finished product compression strength and the wear resistance that obtain brightOutside aobvious raising, and mixing materials discharging is easier, and heels still less, reduces clout waste, and the province that saves timePower, reduces labor intensity, and the plasticity of the mixing materials obtaining can reach 250～300, compares prior artBe significantly improved.
The foregoing is only specific embodiments of the invention, but technical characterictic of the present invention is not limited to this,Any those skilled in the art is in the field of the invention, and the variation of doing or modification are all encompassed in the present inventionThe scope of the claims among.
Claims (4)
1. a calendering process for SCR honeycomb denitrating catalyst, is characterized in that: comprise the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid 5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricatedAgent 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, stickyKnot agent 15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is O-phthalicDioctyl phthalate or dibutyl phthalate, binding agent is in polyvinyl alcohol, carboxylic propyl methocelOne or both;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, stir speedDegree is 80～120r/min, and mixing time is 10～15min;
Step 3: add successively lubricant, continue to stir, mixing speed is 400～600r/min, when stirringBetween be 5～10min, add in addition water, regulate water content to 36～38%, then add a part of ammoniacal liquorRegulate pH value to 8～9, system temperature is 40～60 DEG C;
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir mixing speedBe 80～120r/min, mixing time is 5～10min, continues to add water, adjusting water content to 40～45%, system temperature is 50～55 DEG C;
Step 5: open air bleeding valve, continue to stir, mixing speed is 400～600r/min, and mixing time is25～30min, then adds the ammoniacal liquor of surplus and continues to add water, and regulating water content is 30～35%,PH value is 7～8, and temperature is controlled to 85～90 DEG C, obtains the mixing of SCR honeycomb denitrating catalystMaterial.
2. the calendering process of a kind of SCR honeycomb denitrating catalyst as claimed in claim 1, is characterized in that: stepIn rapid three, add a part of ammoniacal liquor to regulate pH value to 8.2, system temperature is 45～48 DEG C.
3. the calendering process of a kind of SCR honeycomb denitrating catalyst as claimed in claim 1, is characterized in that: stepIn rapid four, regulate water content to 40～42%, system temperature is 50～53 DEG C.
4. the calendering process of a kind of SCR honeycomb denitrating catalyst as claimed in claim 1, is characterized in that: stepIn rapid five, regulating water content is that 30～32%, pH value is 7.7, and temperature is controlled to 85～88 DEG C.
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| CN104741113B (en) * | 2015-04-02 | 2017-07-14 | 易能环境技术有限公司 | A kind of inexpensive denitrating catalyst and preparation method thereof |
| CN104888805B (en) * | 2015-05-07 | 2017-09-08 | 浙江海亮环境材料有限公司 | A kind of calendering process of SCR honeycombs denitrating catalyst |
| CN106902811A (en) * | 2017-02-12 | 2017-06-30 | 盐城工业职业技术学院 | The calendering process of cellular low-temperature denitration catalyst |
| CN111138722B (en) * | 2020-01-14 | 2022-01-28 | 浙江绿禾生态科技股份有限公司 | Starch-based degradable material and preparation method thereof |
| CN112717921A (en) * | 2020-09-01 | 2021-04-30 | 江苏峰业科技环保集团股份有限公司 | SCR denitration catalyst and preparation process thereof |
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