CN107573094A - A kind of micropore ceramic filtration medium for hot environment and preparation method thereof - Google Patents
A kind of micropore ceramic filtration medium for hot environment and preparation method thereof Download PDFInfo
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- CN107573094A CN107573094A CN201710814274.8A CN201710814274A CN107573094A CN 107573094 A CN107573094 A CN 107573094A CN 201710814274 A CN201710814274 A CN 201710814274A CN 107573094 A CN107573094 A CN 107573094A
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- haydite
- micropore
- filtration medium
- ceramic filtration
- micropore ceramic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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Abstract
The present invention relates to a kind of micropore ceramic filtration medium for hot environment and preparation method thereof.The micropore ceramic filtration medium is porous haydite, and aperture is controllable at 0.1~100 micron.The micropore ceramic filtration pore size of media of the present invention is controllable at 0.1~100 micron, therefore in filter process less than 20 microns dust are reached with preferable filter effect, and because the characteristic of haydite, it is possible to achieve applied at elevated temperature, such as its temperature in use is up to more than 600 DEG C.
Description
Technical field
The present invention relates to a kind of micropore ceramic filtration medium for hot environment, belong to ceramic industry high temperature filtration medium
Field.
Background technology
Granular bed filters are that dusty gas carries out dust removal by filtration by certain thickness particle layers, and bed medium is mostly
To be in stable condition, high temperature resistant, the inorganic non-metallic material of resistance to acids and bases.The advantages of this filtering technique, is：With especially good
High temperature resistant, resistance to acids and bases, persistence is good, shock resistance, wear-resistant, and bed medium is cheap.
Filter medium common at present has：Quartz sand, activated carbon granule, diatomite etc., these filter mediums respectively have feature,
But simultaneously also all in need solve the problems, such as.Such as quartz sand, cheap, resistance to acids and bases is good, high temperature resistant, but its conduct
It is relatively low to the absorption efficiency of less than 20 microns fine solid particles during Bed Filtration medium.Activated carbon granule is as filter media
Effect is good, but its filtering is to be unable to high temperature resistant, using being restricted.Therefore need to develop a kind of new filter medium, can
To adapt to higher temperature, while filter efficiency of the filter to less than 20 microns particle diameter dust can be improved.Make Bed Filtration
Device has the filter capacity of higher efficiency at high temperature, meets increasingly strict environmental requirement and industrial requirement.
The content of the invention
In order to improve the filter capacity of granular bed filters at high temperature, solution granular bed filters are now existing to ask
Topic, inventor developed a kind of gangue micropore ceramic filtration medium for hot environment, makes granular bed filters to 20
The following particle diameter dust of micron has very high filter efficiency.
On the one hand, the present invention provides a kind of micropore ceramic filtration medium that can adsorb fine particle in high temperature environments, institute
It is porous haydite to state micropore ceramic filtration medium, and aperture is controllable at 0.1~100 micron.
The micropore ceramic filtration pore size of media of the present invention is controllable at 0.1~100 micron therefore micro- to 20 in filter process
The following dust of rice reaches preferable filter effect, and because the characteristic of haydite, it is possible to achieve applied at elevated temperature, such as its temperature in use
Up to more than 600 DEG C.
In the present invention, the porosity of the haydite can be 10~80%.The bulk density of the haydite can be 200~
900kg/m3.In addition, the cylindrical compress strength of the haydite can be 0.2~6.5MPa.The present invention haydite particle diameter it is suitable, and with compared with
High intensity, larger porosity, due to its inorganic non-metallic material performance, thus this haydite high temperature resistant, resistance to acids and bases, persistently
It is the good, shock resistance of property, wear-resistant and cheap.
It is preferred that the raw material of the haydite is selected from least one of gangue, clay, flyash, shale.
On the other hand, the present invention provides the method for preparing above-mentioned micropore ceramic filtration medium, comprises the following steps：
(1) ceramic material powder is well mixed with the pore creating material that particle diameter is 0.05~200 micron, adds water that green compact bead is made；
(2) green compact bead is incubated 5~120 minutes at 200~750 DEG C, then heats to 850~1200 DEG C and be incubated 5~60 points
Clock, obtain the micropore ceramic filtration medium.
It is preferred that the particle diameter of the ceramic material powder is 0.1~500 micron.
It is preferred that the ceramic material powder in gangue powder, clay, flyash, slate flour at least one
Kind.
It is preferred that the pore creating material be 200~750 DEG C can after-flame particle, preferably coal dust, starch, carbonate, paste
At least one of essence, polyethylene particle.
It is preferred that the mass ratio of ceramic material powder and pore creating material is 1：(0.1~4.5).By controlling ceramic raw material powder
End and the mass ratio of pore creating material, the porosity of gained haydite can be controlled.
It is preferred that in step (2), a diameter of 0.5~50mm of the green compact bead.
In the present invention, the aperture of the haydite can be controlled by controlling the particle diameter of pore creating material.
The third aspect, the present invention provide application of the above-mentioned micropore ceramic filtration medium in fine particle is adsorbed, especially
Application in particle layers filter plant.
The present invention micropore ceramic filtration medium be adapted to higher temperature, while can improve filter to 20 microns with
The filter efficiency of lower particle diameter dust, make granular bed filters that there is the filter capacity of higher efficiency at high temperature, meet increasingly tight
The environmental requirement of lattice and industrial requirement.
Fourth aspect, the present invention provide a kind of granular bed filters, and it contains any one above-mentioned micropore ceramic filtration and is situated between
Matter.
5th aspect, the present invention provide a kind of dust removal method, using above-mentioned granular bed filters filter dusty gas with except
Remove dust therein.
Brief description of the drawings
Fig. 1 is the section hole schematic diagram of the haydite of an example of the present invention；
Fig. 2 is haydite cross-section morphology figure made from embodiment 1；
Fig. 3 is haydite cross-section morphology figure made from embodiment 2.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing and following embodiments, it should be appreciated that accompanying drawing and following embodiments
The present invention is merely to illustrate, is not intended to limit the present invention.
Fig. 1 shows the section hole schematic diagram of the micropore haydite of an embodiment of the present invention, as shown in figure 1, the micropore is made pottery
Grain is loose structure, and the shape in hole is not particularly limited.In addition, hole can be evenly distributed in haydite.Aperture is in micron order, example
Such as 0.1~100 micron, preferably 3~30 microns.The material of the micropore haydite is preferably resistant to elevated temperatures ceramics, such as at 600 DEG C
Remain to keep stable above.The porosity of haydite can be 10~80%, preferably 30~60%.Porosity more high filtration effect is more
It is good, but porosity is too high to influence granule strength to a certain extent.
The micropore haydite reaches in filter process to less than 20 microns dust due to suitable micron order aperture
To preferable filter effect.If aperture is excessive, can cause bad for less than 20 microns particulate matter adsorption effects.Also, due to this
Micropore haydite is ceramic material, therefore can realize applied at elevated temperature, such as its temperature in use is up to more than 600 DEG C.For example, this hair
Bright micropore haydite to the absorptivities of less than 20 microns dust in room temperature up to more than 95%, at 600 DEG C up to more than 99%.
Also, as shown in figure 1, micropore haydite can be spherical in shape or subsphaeroidal, its particle diameter can be 0.5~50mm.Micropore haydite
Bulk density can be 200~900kg/m3, preferably 300~650kg/m3.Made pottery with such particle diameter and the micropore of bulk density
Grain be advantageous to when forming particle layers dusty gas by and reaching more preferable pick-up performance.The micropore haydite of the present invention
With higher intensity, its cylindrical compress strength can be 0.2~6.5MPa, preferably 4~6.5MPa.
In the present invention, micropore haydite can be with the relatively inexpensive ceramic raw material haydite that even discarded object is fired into, example
Such as can be coal gangue haydite, clay haydite, lytag, preferably haydites of book structure, coal gangue haydite.Gangue is in coal
With the rock of coal symbiosis, association in charcoal forming process, it is caused solid waste during coal production and dressing of coal by washing, is
One of maximum industrial solid castoff of the current discharge capacity in China.It is cheap that micropore haydite cost is made using gangue, and can
A large amount of consumption gangues, solve the problems, such as its bulk deposition.
Then, the preparation method of the micropore haydite of the present invention is illustrated.
In an embodiment of the present invention, micron order micropore is produced on haydite (such as coal gangue haydite) using pore creating material.
First, ceramic material powder is mixed with pore creating material.Ceramic material powder may be selected from gangue powder, clay, powder
At least one of coal ash, slate flour.The particle diameter of ceramic material powder can be 0.1~500 micron, and preferably 50~100 is micro-
Rice.Ceramic material powder can be by the way that ceramic raw material grinding is obtained.The particle diameter of pore creating material can be 0.05~200 micron, excellent
Elect 3~40 microns as.Pore creating material can be 200~750 DEG C can after-flame particle.In the temperature calcination, pore creating material is fired
Leave hole to the greatest extent.By controlling the particle diameter of pore creating material, the aperture of gained haydite can be controlled.Pore creating material can be organic or inorganic
Pore creating material, such as coal dust, starch, carbonate, dextrin, polyethylene particle etc..The mass ratio of ceramic material powder and pore creating material can
For 1：(0.1~4.5), preferably 1：(0.2~1.5).By controlling the mass ratio, the porosity of gained haydite can be controlled.
Add water into the mixture of ceramic material powder and pore creating material, green compact bead is then made.The addition of water can be
The 3~40% of mixture gross mass.Green compact bead can be made with hand rubbing or in comminutor.The diameter of green compact bead can be 0.5
~50mm.After green compact bead is made, it can be aged 1~48 hour.
Green compact bead is burnt till.(200~750 DEG C) of the first temperature insulation a period of time can be first warming up to, with except
Go pore creating material to form hole, be then warming up to (850~1200 DEG C) insulation a period of times of second temperature again, obtain micropore haydite.
The speed for being warming up to the first temperature can be 0.5~20 DEG C/min.It can be 5~120 minutes in the soaking time of the first temperature.Rise
The speed of temperature to second temperature can be 0.5~20 DEG C/min.It can be 5~60 minutes in the soaking time of second temperature.
After burning till, less than 50 DEG C can be naturally cooled to.
The micropore haydite of the present invention can be used for absorption fine particle (fine solid particle).In one embodiment, of the invention is micro-
Hole haydite can be as the filter medium in granular bed filters.The granular bed filters can be filtered to dusty gas to remove
Dust therein, especially there is excellent filter efficiency to less than 20 microns particle diameter dust at high temperature.Granular bed filters
In,
Micropore haydite as filter medium forms particle layers, and its thickness can be filled according to engineering is actual.
Moreover, the size tunable of the micropore haydite of the present invention, it is appropriate to be carried out according to the particle diameter of fine particle to be adsorbed
Adjust to obtain more preferable adsorption effect.That is, the present invention can realize efficient mistake of the controllable grain size micropore haydite to fine particle
Filter.
The present invention solves the problems, such as that granular bed filters are to fine solid particle poor filtration effect, phase during high-temperature dust removal
For quartz sand, there is very high filter effect to fine solid particle, relative to activated carbon granule, be resistant to very high temperature.
Embodiment is enumerated further below to describe the present invention in detail.It will similarly be understood that following examples are served only for this
Invention is further described, it is impossible to is interpreted as limiting the scope of the invention, those skilled in the art is according to this hair
Some nonessential modifications and adaptations that bright the above is made belong to protection scope of the present invention.Following examples are specific
Technological parameter etc. is also only an example in OK range, i.e. those skilled in the art can be done properly by this paper explanation
In the range of select, and do not really want to be defined in the concrete numerical value of hereafter example.
Embodiment 1
A kind of gangue micropore ceramic filtration medium for hot environment, comprise the following steps：
(1) coal dust is ground 8 hours in ball mill, taken out, dried, sieving, select 5 micron particles；
(2) accurate weighing 500g selects coal dust, is mixed with the gangue powder 1500g of grinding to 50 microns, adds water 400ml,
Green compact bead of the diameter in 0.5~5mm is made in hand rubbing；
The gangue chemical composition of table 1 forms
(3) obtained green compact bead is aged 6 hours；
(4) the green compact bead that step (3) obtains is burnt till, its calcining system is：600 are warming up to 12 DEG C/min speed
DEG C, it is incubated 5min；1050 DEG C are warming up to 20 DEG C/min speed, is incubated 15min；Less than 50 DEG C are naturally cooled to again, are made
Bulk density is 639kg/m3, cylindrical compress strength 4.05MPa micropore ceramic filtration medium.Fig. 2 shows that the micropore ceramic filtration is situated between
The microscopic appearance figure in the section of matter.Measured using mercury injection apparatus, the aperture of the micropore ceramic filtration medium is 3~10 microns, hole
Rate is 31.2%.
Embodiment 2
A kind of gangue micropore ceramic filtration medium for hot environment, comprise the following steps：
(1) starch is ground 10 minutes in vibromill, taken out, dried, sieving, select 15 micron particles；
(2) accurate weighing 100g selects starch, is mixed with the gangue powder 200g of grinding to 30 microns, adds water 30ml, hand rubbing
Green compact bead of the diameter in 0.5~5mm is made；
(3) obtained green compact bead is aged 8 hours；
(4) the green compact bead that step (3) obtains is burnt till, its calcining system is：650 are warming up to 10 DEG C/min speed
DEG C, it is incubated 5min；1050 DEG C are warming up to 22 DEG C/min speed, is incubated 15min；Less than 50 DEG C are naturally cooled to again, are made
Bulk density is 641kg/m3, cylindrical compress strength 6.5MPa micropore ceramic filtration medium.Fig. 3 shows the micropore ceramic filtration medium
Section microscopic appearance figure.Measured using mercury injection apparatus, the aperture of the micropore ceramic filtration medium is 5~20 microns, porosity
For 47.8%.
Respectively by the use of the haydite of embodiment 1 and the gained of embodiment 2 as the filter medium of granular bed filters, in section wind speed
For 1.3m/s, when bed height is 60cm, its filter efficiency respectively reaches 99.12% and 99.65%.Wherein in 20 microns of room temperature
Following particle filtering effect respectively reaches 88.3% and 95.4%, is respectively reached in 600 DEG C of less than 20 microns particle filtering effects
89.7% and 97.4%.
Claims (10)
- A kind of 1. micropore ceramic filtration medium that can adsorb fine particle in high temperature environments, it is characterised in that the micropore pottery Grain filter medium is porous haydite, and aperture is controllable at 0.1~100 micron.
- 2. micropore ceramic filtration medium according to claim 1, it is characterised in that the porosity of the haydite be 10~ 80%。
- 3. micropore ceramic filtration medium according to claim 1 or 2, it is characterised in that the bulk density of the haydite is 200~900kg/m3, the cylindrical compress strength of the haydite is 0.2~6.5MPa.
- A kind of 4. method of the micropore ceramic filtration medium prepared any one of claims 1 to 3, it is characterised in that bag Include following steps：（1）Ceramic material powder is well mixed with the pore creating material that particle diameter is 0.05~200 micron, adds water that green compact bead is made；（2）Green compact bead is incubated 5~120 minutes at 200~750 DEG C, 850~1200 DEG C is then heated to and is incubated 5~60 points Clock, obtain the micropore ceramic filtration medium.
- 5. according to the method for claim 4, it is characterised in that the particle diameter of the ceramic material powder is 0.1~500 micro- Rice, it is preferable that the ceramic material powder is selected from least one of gangue powder, clay, flyash, slate flour.
- 6. the method according to claim 4 or 5, it is characterised in that the pore creating material is can after-flame at 200~750 DEG C At least one of particle, preferably coal dust, starch, carbonate, dextrin, polyethylene particle.
- 7. the method according to any one of claim 4 to 6, it is characterised in that the matter of ceramic material powder and pore creating material Amount is than being 1：（0.1~4.5）.
- 8. the method according to any one of claim 4 to 7, it is characterised in that step（1）In, the green compact bead A diameter of 0.5~50mm.
- 9. a kind of granular bed filters, it is characterised in that contain the micropore ceramic filtration any one of claims 1 to 3 Medium.
- A kind of 10. dust removal method, it is characterised in that usage right requirement 11 described in granular bed filters filtering dusty gas with Remove dust therein.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109650938A (en) * | 2019-01-16 | 2019-04-19 | 赵志刚 | Ceramic filter and its preparation method and application |
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