CN104888805A - Mixing process for SCR honeycomb denitration catalyst - Google Patents
Mixing process for SCR honeycomb denitration catalyst Download PDFInfo
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- CN104888805A CN104888805A CN201510229268.7A CN201510229268A CN104888805A CN 104888805 A CN104888805 A CN 104888805A CN 201510229268 A CN201510229268 A CN 201510229268A CN 104888805 A CN104888805 A CN 104888805A
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Abstract
The invention relates to a mixing process for an SCR honeycomb denitration catalyst, and belongs to the field of denitration catalysts, which improves the utilization rate of damaged catalysts and lowers the recycling cost of damaged catalysts. The mixing process for the SCR honeycomb denitration catalyst comprises the steps of a, adding a damaged catalyst and water in a blender to obtain a mixture, and stirring the mixture at the speed of 80r/min-120r/min for 10-15 min so as to soften the catalyst; b, adding a lubricant, a plasticizer and a binder in the blender and further stirring the mixture at the speed of 400 r/min-600r/min for 5-10 min so as to obtain the mixed material of an SCR honeycomb denitration catalyst. The lubricant is selected from glycerol or tri-ethanolamine. The plasticizer is selected from dioctyl phthalate or di-butyl phthalate. The binder is one or two selected from polyvinyl alcohol and hydroxypropyl methyl cellulose.
Description
Technical field
The present invention relates to a kind of calendering process of SCR honeycomb denitrating catalyst, belong to field of denitration catalyst.
Background technology
At present, the raw material of titanium dioxide, tungstic acid, vanadic anhydride, shaping assistant successively through mixing, pre-extruded, extrude, primary drying, redrying, calcining, after cutting, obtained SCR honeycomb denitrating catalyst.Because the cost of raw material is high, primary drying can produce damaged catalyst and redrying can produce damaged catalyst, therefore, SCR honeycomb denitrating catalyst has the high shortcoming of manufacturing cost.
Summary of the invention
Problem to be solved by this invention is just to provide a kind of calendering process of SCR honeycomb denitrating catalyst, reduces the manufacturing cost of SCR honeycomb denitrating catalyst.
For solving the problem, the present invention adopts following technical scheme:
A calendering process for SCR honeycomb denitrating catalyst, comprises the steps:
A. damaged catalyst and water are added in mixer and stir, mixing speed is 80r/min-120r/min, and mixing time is 10min-15min, softens to make catalyst;
B. lubricant, plasticizer, binding agent are added continuation in mixer and stir, mixing speed is 400r/min-600r/min, and mixing time is 5min-10min, obtains the mixing materials of SCR honeycomb denitrating catalyst; Wherein, described lubricant is glycerine or triethanolamine, and described plasticizer is dioctyl phthalate or dibutyl phthalate, and described binding agent is one or both in polyvinyl alcohol, carboxylic propyl methocel.
SCR honeycomb denitrating catalyst of the present invention is obtained by damaged catalyst, and the recycling of damaged catalyst can save the manufacturing cost of SCR honeycomb denitrating catalyst, avoids damaged catalyst occupied ground, avoid damaged contaminated environment.In addition, because damaged catalyst is through calendering process, therefore, the SCR honeycomb denitrating catalyst that the present invention adopts damaged catalyst to obtain also a saving the manufacturing cost of mixing materials.
Further, in step a, add appropriate tungstic acid and/or ammonium metavanadate aqueous solution.
Further, in stepb, the water content of mixing materials is 28%-35%.
Further, described damaged catalyst is the damaged catalyst after primary drying and/or the damaged catalyst after redrying.The mixing materials of step b need successively through pre-extruded, extrude, primary drying, redrying, calcining, after cutting, just can obtain denitrating catalyst, damaged catalyst source of the present invention is in primary drying technique and/or redrying technique.
Detailed description of the invention
Below the technical scheme of the embodiment of the present invention is explained and illustrated, but following embodiment is only the preferred embodiments of the present invention, and not all.Based on the embodiment in embodiment, those skilled in the art under the prerequisite not making creative work obtain other embodiments, all belong to protection scope of the present invention.
Embodiment one
A calendering process for SCR honeycomb denitrating catalyst, comprises the steps:
A. damaged catalyst and water are added in mixer and stir, mixing speed is 80r/min-120r/min, and mixing time is 10min-15min, softens to make catalyst;
B. lubricant, plasticizer, binding agent are added continuation in the mixer of step a and stir, mixing speed is 400r/min-600r/min, and mixing time is 10min-15min, obtains the mixing materials of SCR honeycomb denitrating catalyst.
In stepb, the water content of mixing materials is 30%.
In the present embodiment, lubricant is glycerine, and plasticizer is dioctyl phthalate, and binding agent is polyvinyl alcohol.
In the present embodiment, described damaged catalyst is the damaged catalyst after primary drying, and the water content due to the damaged catalyst after primary drying is 10%, therefore, it directly can be dropped in mixer.
If add oarse-grained damaged catalyst in raw material, then damaged catalyst can affect yield rate, the end product quality of SCR honeycomb denitrating catalyst.Therefore, before the damaged catalyst of recycling, damaged catalyst needs through process, and its treatment step is: first, the damaged catalyst of high-temperature calcination, and calcining heat is generally 600 DEG C; Then, the damaged catalyst after calcining is carried out Ultrafine Grinding.
Because above-mentioned two steps add the recycling cost of damaged catalyst, therefore, in the present invention, damaged catalyst and water is only added in mixer, to make damaged catalyst before recycling, do not need to carry out high-temperature calcination and Ultrafine Grinding, thus reduce the recycling cost of damaged catalyst.
The more important thing is, in the present invention, raw material in mixer after high-temperature maturing, just occur damaged in drying process, therefore, after damaged catalyst and water are put into mixer, without the need to again carrying out high-temperature maturing, thus shorten the manufacturing time of mixing materials.
Embodiment two
A calendering process for SCR honeycomb denitrating catalyst, comprises the steps:
A. damaged catalyst, tungstic acid (tungstic acid is solid particle), ammonium metavanadate aqueous solution and water are added in mixer and stir, mixing speed is 80r/min-120r/min, and mixing time is 10min-15min, softens to make catalyst;
B. lubricant, plasticizer, binding agent are added continuation in the mixer of step a and stir, mixing speed is 400r/min-600r/min, and mixing time is 10min-15min, obtains the mixing materials of SCR honeycomb denitrating catalyst.
In stepb, the water content of mixing materials is 28%.
In the present embodiment, lubricant is triethanolamine, and plasticizer is dibutyl phthalate, and binding agent is polyvinyl alcohol and carboxylic propyl methocel.
In the present embodiment, described damaged catalyst is the damaged catalyst after redrying, and the water content due to the damaged catalyst after redrying is 3%, therefore, needs to put it in deionized water after maceration, then drops in mixer.
Embodiment three
A calendering process for SCR honeycomb denitrating catalyst, comprises the steps:
A. damaged catalyst, ammonium metavanadate aqueous solution and water are added in mixer and stir, mixing speed is 80r/min-120r/min, and mixing time is 10min-15min, softens to make catalyst;
B. lubricant, plasticizer, binding agent are added successively in the mixer of step a and continue to stir, mixing speed is 400r/min-600r/min, and mixing time is 10min-15min, obtains the mixing materials of SCR honeycomb denitrating catalyst.
In stepb, the water content of mixing materials is 35%.
In the present embodiment, lubricant is glycerine, and plasticizer is dioctyl phthalate, and binding agent is carboxylic propyl methocel.
In the present embodiment, described damaged catalyst is the damaged catalyst after primary drying and the damaged catalyst after redrying, water content due to the damaged catalyst after primary drying is 10%, the water content of the damaged catalyst after redrying is 3%, therefore, damaged catalyst after redrying needs to put it in deionized water after maceration, then drops in mixer with the damaged catalyst after primary drying simultaneously.
The above, be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and those of ordinary skill in the art should be understood that and the present invention includes but the content described in being not limited to detailed description of the invention above.Any amendment not departing from function and structure principle of the present invention all will comprise within the scope of the appended claims.
Claims (4)
1. a calendering process for SCR honeycomb denitrating catalyst, is characterized in that comprising the steps:
A. damaged catalyst and water are added in mixer and stir, mixing speed is 80r/min-120r/min, and mixing time is 10min-15min, softens to make catalyst;
B. lubricant, plasticizer, binding agent are added continuation in mixer and stir, mixing speed is 400r/min-600r/min, and mixing time is 5min-10min, obtains the mixing materials of SCR honeycomb denitrating catalyst; Wherein, described lubricant is glycerine or triethanolamine, and described plasticizer is dioctyl phthalate or dibutyl phthalate, and described binding agent is one or both in polyvinyl alcohol, carboxylic propyl methocel.
2. the calendering process of SCR honeycomb denitrating catalyst as claimed in claim 1, is characterized in that: in step a, adds appropriate tungstic acid and/or ammonium metavanadate aqueous solution.
3. the calendering process of SCR honeycomb denitrating catalyst as claimed in claim 1, it is characterized in that: in stepb, the water content of mixing materials is 28%-35%.
4. the calendering process of SCR honeycomb denitrating catalyst as claimed in claim 1, is characterized in that: described damaged catalyst is the damaged catalyst after primary drying and/or the damaged catalyst after redrying.
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| CN201510229268.7A CN104888805B (en) | 2015-05-07 | 2015-05-07 | A kind of calendering process of SCR honeycombs denitrating catalyst |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10323570A (en) * | 1997-05-26 | 1998-12-08 | Babcock Hitachi Kk | Catalyst for denitration of flue gas and its production |
| CN102166516A (en) * | 2011-03-10 | 2011-08-31 | 青岛华拓电力环保有限公司 | Catalytic agent for denitrating smoke and preparation technology thereof |
| CN103752347A (en) * | 2014-01-26 | 2014-04-30 | 南京宇行环保科技有限公司 | Preparation method of honeycomb denitration catalyst |
| CN104190405A (en) * | 2014-07-23 | 2014-12-10 | 浙江海亮环境材料有限公司 | Mixing process of SCR honeycomb denitration catalyst |
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2015
- 2015-05-07 CN CN201510229268.7A patent/CN104888805B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10323570A (en) * | 1997-05-26 | 1998-12-08 | Babcock Hitachi Kk | Catalyst for denitration of flue gas and its production |
| CN102166516A (en) * | 2011-03-10 | 2011-08-31 | 青岛华拓电力环保有限公司 | Catalytic agent for denitrating smoke and preparation technology thereof |
| CN103752347A (en) * | 2014-01-26 | 2014-04-30 | 南京宇行环保科技有限公司 | Preparation method of honeycomb denitration catalyst |
| CN104190405A (en) * | 2014-07-23 | 2014-12-10 | 浙江海亮环境材料有限公司 | Mixing process of SCR honeycomb denitration catalyst |
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