CN108178654A - A kind of method that hot pressing note technique prepares ceramic filter - Google Patents
A kind of method that hot pressing note technique prepares ceramic filter Download PDFInfo
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- CN108178654A CN108178654A CN201611119793.4A CN201611119793A CN108178654A CN 108178654 A CN108178654 A CN 108178654A CN 201611119793 A CN201611119793 A CN 201611119793A CN 108178654 A CN108178654 A CN 108178654A
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
- C04B38/068—Carbonaceous materials, e.g. coal, carbon, graphite, hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2093—Ceramic foam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/04—Discharging the shaped articles
- B28B13/06—Removing the shaped articles from moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The present invention relates to a kind of methods that hot pressing note technique prepares ceramic filter, include the following steps：The alumina powder of appropriate grain size distribution is mixed according to certain proportioning with paraffin, then the size according to required aperture and distribution, one or more pore creating materials, such as carbon dust, sawdust, aluminium salt, titanium salt, magnesium salts, sodium salt, lanthanum salt, cerium salt etc. are inserted, configures alumina slurry.Under pressure, injection meets the die for molding of shape need, prepares the various special filter device green bodies met the requirements.For green body after row burns, removal pore creating material obtains porous body.Porous body obtains special-shaped aluminium oxide ceramics filter after high temperature sintering.For whole process without special mechanical equipment, the controlled shape of the size of hole, distribution and filter, is a kind of ideal technology that can prepare high porosity, high intensity, non-conventional type ceramic filter.
Description
Technical field
The present invention relates to a kind of method that hot pressing note technique prepares ceramic filter,
Background technology
With the development of society, environmental pressure is on the rise, requirement of each field to filter device is caused to be gradually increased.With
For the industries such as metallurgy, machinery, chemical industry, electric power, not only temperature is high for the high-temperature dusty gas that various industrial furnaces are emitted
(500~1200 DEG C), and be the master for causing environmental pollution containing a large amount of dust (5~30 μm) and corrosion reducibility gas
Want one of factor.Under hot conditions, since dusty gas viscous force has large change, humidity declines to a great extent, and fine grained cohesion is existing
As being greatly lowered, so having to the separation of particle more highly difficult.Fiber bag precipitator cannot bear the high temperature of dusty gas, wet type
Dedusting makes its thermal energy that cannot be comprehensively utilized again；Electrostatic precipitation there is primary investment height again, take up a large area and insulate etc. square
The problem of face.At present, the processing method of China's hot industry dusty gas is by water condensation mostly, and high-temp waste gas is down to
200 DEG C or so, then with bag filter dedusting, investment and operating cost this not only adds condensing plant also make a large amount of
Heat energy loss.It is also higher to the shape need of filter additionally, due to the design of kiln.Therefore, high-temperature dusty gas ceramics mistake
The development and utilization of filter has preferable prospect.
With deepening continuously for porous ceramics research work, technology of preparing is also enriched constantly, is perfect.The system of porous ceramics
Standby technology directly determines the structure and performance of ceramics.Common are extrinsion pressing, addition pore creating material method, foaming,
Sol-gel method etc..Porous ceramics prepared by extrinsion pressing, hole shape, pore size distribution are uniform, but are unsuitable for preparing
Pore-size is less than the porous ceramics of 1mm；Traditional addition pore creating material method prepares porous ceramics, and even air hole distribution is poor,
Be not suitable for preparing the product of high porosity；Foaming adds organic or inorganic pore creating material, is waved by physically or chemically reacting generation
Hair property gas and generate foam, porous ceramics is made after drying and sintering, be unsuitable for prepare with perforation pore structure system
Product；Fabrication of porous ceramics using polymeric sponge dipping method, pore size depend primarily on the pore size of Organic Foam Material, and product cannot
Realize the filtering of molecule；Sol-gel method obtains hole by phase transformation or chemical reaction, and pore-size is nanoscale, hole
Gap rate is relatively low.Since above-mentioned technique is there are certain limitation, the pore-size and porosity obtained is limited in a certain range
It is interior, it is difficult to prepare the special porous ceramic filter of micron order pore-size, high porosity, high intensity, shape.
Invention content
It is unique the purpose of the present invention is hot pressing note technique is used to prepare high porosity, shape for the above-mentioned state of the art
Aluminium oxide ceramics filter, to meet requirement of the high-temperature dusty gas filter to porosity, pore-size and intensity.The present invention
The method for preparing aluminium oxide ceramics filter, the preparation including alumina composite powder, the preparation of aluminium oxide ceramics slurry, slurry
Molding, green body row burn and sintering.It is as follows：(1) preparation of high-performance alumina composite powder
1. according to the requirement of filter hole and shape, varigrained alumina powder and auxiliary material are mixed, made
It is standby go out suitable alumina powder.
2. size and distribution according to required aperture insert the suitable ball-type pore creating material of one or more granularities, such as carbon
Powder, sawdust, aluminium salt, titanium salt, magnesium salts, sodium salt, lanthanum salt, cerium salt etc..Mixing is stirred under room temperature, normal pressure, is aoxidized
Aluminium composite powder.
(2) preparation of slurry
1. alumina composite powder is mixed in a certain ratio with paraffin, 50-100 DEG C of heating temperature, do not stop with 2-12h
Mechanical agitation, preparation obtain uniformly mixed slurry.
2. froth in vacuum.By uniformly mixed slurry, the bubble in slurry is removed under vacuum.
(3) injection-compression molding
Shape need according to filter prepares corresponding mold, and the slurry prepared is passed through common hot-injection molding
Machine injects die for molding.According to different hole and shape need, 30-80 DEG C of mold temperature, briquetting pressure 0.3-0.8MPa,
Molding time 3-60s.
By molding green body in room temperature condition bottom knockout, special filter device green body is obtained.
(4) row burns
Green body after demoulding is positioned over row to burn in stove, heating removal pore creating material makes green body have certain intensity, avoids
It cracks in operation.According to different pore creating materials, temperature is 400-1400 DEG C of room temperature, time 8-48h.
(5) it is sintered
Green body is put into high temperature Muffle furnace, 1350-1550 DEG C of heat preservation 2-8h is warming up to 2-10 DEG C/min, then with stove
Cooling, obtains aluminium oxide ceramics filter.
The aluminium oxide ceramics filter prepared using the method provided by the present invention is had higher porosity and orients perforation
Pore structure, reconfigurable, between open-cell porosity 40-90%, 1-900 microns of pore-size, aperture height aligns, by force
Spend 0.5-67.5MPa.
In conclusion the present invention has the following advantages：
(1) technique is noted using hot pressing convenient for preparing the porous ceramics of the micron order hole of high porosity, oriented linear porosity；
(2) high-performance alumina composite powders can reduce the sintering temperature of aluminium oxide；
(3) the ceramic filter porosity 40-90% for preparing of the present invention can be adjusted in aperture size 1-900 micron ranges
Section, pore size, porosity, distribution of pores are easily controllable；、
(4) the aluminium oxide ceramics filter of special shape that the present invention can be prepared；
(5) ceramic filter maximum operation (service) temperature prepared by the present invention is up to 1300 degree or more；
(6) aluminium oxide ceramics filter prepared by the present invention, can be by repeating to make after being used for multiple times after simply handling
With.
Specific embodiment
Embodiment 1
(1) preparation of high-performance alumina composite powder,
1. by the alumina powder that 1000g granularities are 5 microns, the oxide with calcium, magnesium, iron, potassium, sodium, silicon is respectively
10g, 10g, 20g, 10g, 10g, 20g carry out dry powder ball milling mixing 2h as auxiliary material, obtain alumina powder.
2. using 500g granularities be 400 microns sawdust as pore creating material addition alumina powder in, under room temperature, normal pressure into
Row is stirred, and obtains alumina composite powder.
(2) preparation of slurry
1. alumina composite powder is mixed with paraffin according to proportioning 20/200,60 DEG C of heating temperature, ceaselessly machinery stirs
12h is mixed, preparation obtains good fluidity, uniformly mixed slurry.
2. froth in vacuum.By uniformly mixed slurry, the bubble in slurry is removed under vacuum.
(3) injection-compression molding
The slurry that will be prepared injects the die for molding of rectangular sheet by common hot-injection molding machine.Mold temperature
40 DEG C, briquetting pressure 0.6MPa, molding time 5s of degree.
By molding green body in room temperature condition bottom knockout, rectangular sheet filter blank is obtained.
(4) row burns
Rectangular flake shaped base substrate after demoulding is positioned over row to burn in stove, removes pore creating material.Temperature is 500 DEG C, time 5h, row
Green body has certain intensity after burning.
(5) it is sintered
Green body is put into high temperature Muffle furnace, 1400 DEG C of heat preservation 2h are warming up to 5 DEG C/min, then furnace cooling obtains
Aluminium oxide ceramics filter.
Embodiment 2
(1) preparation of high-performance alumina composite powder,
1. by aluminium oxide 300g, the aluminium oxide 700g that granularity is 50 microns that granularity is 5 microns, with calcium, magnesium, iron, potassium,
Sodium, silicon oxide auxiliary material be respectively 20g, 20g, 10g, 10g, 10g, 20g carry out dry powder ball milling mix 2h, obtain alumina powder
Material.
2. the carbon dust that 200g granularities are 5 microns and being added in as pore creating material for the carbon dust that 300g granularities are 30 microns are aoxidized
In aluminium powder material, mixing is stirred under room temperature, normal pressure, obtains alumina composite powder.
(2) preparation of slurry
1. alumina composite powder is mixed with paraffin by proportioning by 25/200,80 DEG C of heating temperature, ceaselessly machinery stirs
It mixes for 24 hours, preparation obtains good fluidity, uniformly mixed slurry.
2. froth in vacuum.By uniformly mixed slurry, the bubble in slurry is removed under vacuum.
(3) injection-compression molding
The slurry that will be prepared injects the die for molding of tubulose by common hot-injection molding machine.Mold temperature 50
DEG C, briquetting pressure 0.7MPa, molding time 15s.
By molding green body in room temperature condition bottom knockout, tubular filter green body is obtained.
(4) row burns
Tubulose green body after demoulding is positioned over row to burn in stove, removes pore creating material.Temperature be 800 DEG C of room temperatures, time 10h,
Green body has certain intensity after row burns.
(5) it is sintered
Green body is put into high temperature Muffle furnace, 1550 DEG C of heat preservation 2.5h are warming up to 2 DEG C/min, then furnace cooling obtains
To aluminium oxide ceramics filter.
Embodiment 3
(1) preparation of high-performance alumina composite powder,
1. by the aluminium oxide that 300g granularities are 5 microns, 100g granularities are 50 microns, 700g granularities are 100 microns, with calcium,
Magnesium, iron, potassium, sodium, silicon oxide auxiliary material be respectively 15g, 20g, 10g, 10g, 10g, 15g carry out dry powder ball milling mix 2h, obtain
Alumina powder.
2. 700g granularities are added in as pore creating material in alumina powder for 500 microns of ammonium salts, carried out under room temperature, normal pressure
It is stirred, obtains alumina composite powder.
(2) preparation of slurry
1. alumina composite powder is mixed with paraffin according to proportioning 60/200,50 DEG C of heating temperature is ceaselessly mechanical
For 24 hours, preparation obtains good fluidity, uniformly mixed slurry for stirring.
2. froth in vacuum.By uniformly mixed slurry, the bubble in slurry is removed under vacuum.
(3) injection-compression molding
The slurry that will be prepared injects the die for molding of taper by common hot-injection molding machine.Mold temperature 60
DEG C, briquetting pressure 0.5MPa, molding time 10s.
By molding green body in room temperature condition bottom knockout, conical filter green body is obtained.
(4) row burns
Taper green body after demoulding is positioned over row to burn in stove, removes pore creating material.Temperature be 1200 DEG C of room temperatures, time 12h,
Green body has certain intensity after row burns.
(5) it is sintered
Green body is put into high temperature Muffle furnace, 1500 DEG C of heat preservation 2h are warming up to 2 DEG C/min, then furnace cooling obtains
Aluminium oxide ceramics filter.
Claims (5)
1. a kind of method that hot pressing note technique prepares ceramic filter, which is characterized in that include the following steps：
(1) preparation of high-performance alumina composite powder
First according to the requirement for crossing ceramic filter hole and shape, varigrained alumina powder and auxiliary material are mixed,
Alumina powder is prepared, the ratio that auxiliary material accounts for alumina powder is 1%~10%；
Ball-type pore creating material is inserted into above-mentioned alumina powder, mixing is stirred under room temperature, normal pressure, obtains alumina composite
Powder, the ratio that ball-type pore creating material accounts for alumina powder are 2%-5%；
(2) preparation of slurry
Above-mentioned alumina composite powder is mixed with paraffin, 50-100 DEG C of heating temperature, with 2-12h ceaselessly mechanical agitations,
Preparation obtains uniformly mixed slurry；
Froth in vacuum：By uniformly mixed slurry, the bubble in slurry is removed under vacuum；
(3) injection-compression molding
Shape need according to ceramic filter prepares corresponding mold, and the slurry after froth in vacuum in step (2) is passed through heat
Injection-compression molding machine injects die for molding, by molding green body in room temperature condition bottom knockout, obtains special filter device green body；
(4) row burns
Special filter device green body is positioned over row to burn in stove, heating removal pore creating material, temperature is 400-1400 DEG C, time 8-48h；
(5) it is sintered
Special filter device green body in step (4) is put into high temperature Muffle furnace, 1350-1550 DEG C is warming up to 2-10 DEG C/min,
2-8h is kept the temperature, then furnace cooling obtains aluminium oxide ceramics filter.
2. the method that a kind of hot pressing note technique according to claim 1 prepares ceramic filter, which is characterized in that the step
Suddenly oxide of the auxiliary material including calcium, magnesium, iron, potassium, sodium, silicon is mixed in (1).
3. the method that a kind of hot pressing note technique according to claim 1 prepares ceramic filter, which is characterized in that the step
Suddenly 30-80 DEG C of mold temperature in (3), briquetting pressure 0.3-0.8MPa, molding time 3-60s.
4. the method that a kind of hot pressing note technique according to claim 1 prepares ceramic filter, which is characterized in that the step
Suddenly ball-type pore creating material is one or more of carbon dust, sawdust, aluminium salt, titanium salt, magnesium salts, sodium salt, lanthanum salt, cerium salt in (1).
5. the method that a kind of hot pressing note technique according to claim 1 prepares ceramic filter, which is characterized in that the step
Suddenly the ratio that alumina composite powder and paraffin mix in (2) is 10：200~60：Between 200.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108046829A (en) * | 2017-12-20 | 2018-05-18 | 东北大学 | A kind of nonmetallic mineral porous substrate and its preparation method and application |
| CN110981532A (en) * | 2019-12-17 | 2020-04-10 | 佛山欧神诺陶瓷有限公司 | Foaming agent, foaming material, composite foamed ceramic and preparation method thereof |
| CN114105615A (en) * | 2021-09-15 | 2022-03-01 | 杭州大和江东新材料科技有限公司 | Preparation method of alumina porous ceramic |
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| CN1454871A (en) * | 2003-05-30 | 2003-11-12 | 武汉理工大学 | Method of preparing hot pressure casting porous ceramic using organic foam micro ball as perforating agent |
| CN1583271A (en) * | 2004-06-15 | 2005-02-23 | 宜兴市太湖载体厂 | Porous alumina catalyst carrier |
| RU2011119067A (en) * | 2011-05-12 | 2012-11-20 | Общество с ограниченной ответственностью "НЭВЗ-Н" (RU) | METHOD FOR PRODUCING POROUS STRUCTURE OF CERAMIC MATERIAL |
| CN103171023A (en) * | 2011-12-23 | 2013-06-26 | 沈阳临德陶瓷研发有限公司 | Preparation method of special-shaped foaming ceramics formed in die casting mode |
| CN104671749A (en) * | 2013-12-03 | 2015-06-03 | 辽宁法库陶瓷工程技术研究中心 | Preparation method of high-porosity aluminum oxide ceramic filter |
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| CN108046829A (en) * | 2017-12-20 | 2018-05-18 | 东北大学 | A kind of nonmetallic mineral porous substrate and its preparation method and application |
| CN110981532A (en) * | 2019-12-17 | 2020-04-10 | 佛山欧神诺陶瓷有限公司 | Foaming agent, foaming material, composite foamed ceramic and preparation method thereof |
| CN110981532B (en) * | 2019-12-17 | 2021-11-09 | 佛山欧神诺陶瓷有限公司 | Foaming agent, foaming material, composite foamed ceramic and preparation method thereof |
| CN114105615A (en) * | 2021-09-15 | 2022-03-01 | 杭州大和江东新材料科技有限公司 | Preparation method of alumina porous ceramic |
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