CN111408283B - Ceramic fiber membrane reinforcing slurry, preparation method and ceramic fiber membrane reinforcing method - Google Patents
Ceramic fiber membrane reinforcing slurry, preparation method and ceramic fiber membrane reinforcing method Download PDFInfo
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- CN111408283B CN111408283B CN202010174703.1A CN202010174703A CN111408283B CN 111408283 B CN111408283 B CN 111408283B CN 202010174703 A CN202010174703 A CN 202010174703A CN 111408283 B CN111408283 B CN 111408283B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0039—Inorganic membrane manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/24—Mechanical properties, e.g. strength
Abstract
The invention discloses ceramic fiber membrane reinforcing slurry, a preparation method and a ceramic fiber membrane reinforcing method, wherein the ceramic fiber membrane reinforcing slurry comprises water, silica sol, water glass, boric acid, aluminum sol and aluminum dihydrogen phosphate solution which are mixed according to a certain proportion, and the solid content of the slurry is 10-20%. The ceramic fiber membrane is sprayed to reinforce the slurry, so that the strength and the scouring performance of the ceramic fiber membrane can be improved, and the service life of a product is greatly prolonged.
Description
Technical Field
The invention relates to the technical field of ceramic membrane materials for high-temperature gas purification, in particular to ceramic fiber membrane reinforced slurry, a preparation method and a ceramic fiber membrane reinforcing method.
Background
The high-temperature ceramic membrane filtration technology is a development direction of hot gas purification, and ceramic membrane materials are the core of the high-temperature ceramic membrane filtration technology.
The high-temperature ceramic membrane material developed at home and abroad at present mainly comprises a high-strength ceramic membrane material and a low-density ceramic fiber membrane material with accumulated particles, wherein the ceramic fiber composite membrane material has the advantages of small filtration resistance, excellent thermal stability, relatively low manufacturing cost and the like, can be widely applied to the fields of high-temperature smoke purification of various industrial boilers, high-temperature gas purification in the coal chemical industry field, smelting, calcium carbide furnace, garbage incinerator and the like, and has a large application market.
A high-temperature ceramic fiber filtering material prepared by adopting a suction filtration forming process has the advantages that the suction pressure of the inner wall and the outer wall is not uniform, the bonding agent amount of the inner side and the outer side of a ceramic fiber membrane material is different, so that the difference between the inner strength and the outer strength is larger, the strength of the inner wall is poorer, the ceramic fiber membrane material is easy to fall off in the washing and back blowing processes, and the dipping or spraying process begins to appear in recent years, for example, a reinforcing method and a reinforced ceramic fiber tube of a ceramic fiber tube of Chinese patent CN 107398133A mainly introduce and select silica sol and resin, a hardening agent is adsorbed to an opening section and a closed section of the ceramic fiber tube by the dipping or spraying process, but the process only enhances the opening section and the closed section, the overall strength is not enhanced, and a patent CN 109650842A (a preparation method of an inorganic bonding ceramic fiber material) sequentially dips an inorganic bonding agent and a pH regulator into a wet blank, so that the wet blank is dipped with the bonding agent, the inorganic bonding agent is mainly distributed on the surface of the material and cannot enter the pore channel, so that the organization structure of the material is uneven, the inorganic bonding agent is gel by adjusting the PH, the process has a long period, the product is deformed, and polluting gas is discharged, so that the process is not economical and environment-friendly.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide ceramic fiber membrane reinforcing slurry, a preparation method and a ceramic fiber membrane reinforcing method, wherein the strength and the scouring performance of a ceramic fiber membrane are improved by spraying the ceramic fiber membrane reinforcing slurry.
According to one aspect of the invention, the ceramic fiber membrane reinforced slurry comprises water, silica sol, water glass, boric acid, aluminum sol and aluminum dihydrogen phosphate solution which are mixed according to a certain proportion, wherein the solid content of the slurry is 10-20%.
Further, the aluminum phosphate solution comprises, by weight, 50-70 parts of water, 10-15 parts of silica sol, 3-5 parts of boric acid, 10-15 parts of water glass, 10-15 parts of aluminum sol and 5-10 parts of aluminum dihydrogen phosphate solution.
Further, the silica sol is acidic, and the solid content of the silica sol is 20-30%;
and/or
The aluminum sol is acidic, and the solid content of the aluminum sol is 25% -30%;
and/or
The solid content of the water glass is 30-50%.
Compared with the prior art, the ceramic fiber membrane reinforced slurry has the following beneficial effects: the ceramic fiber membrane is sprayed to reinforce the slurry, so that the strength and the scouring performance of the ceramic fiber membrane can be improved, and the service life of a product is greatly prolonged.
According to another aspect of the present invention, there is provided a method for preparing a ceramic fiber membrane reinforcing slurry, comprising the steps of:
50-70 parts of water, 10-15 parts of silica sol, 3-5 parts of boric acid, 10-15 parts of water glass, 10-15 parts of aluminum sol and 5-10 parts of aluminum dihydrogen phosphate solution;
and mixing and stirring for 0.5-3h to ensure that the solid content of the slurry is 10-20%, and preparing the slurry.
Compared with the prior art, the preparation method of the ceramic fiber membrane reinforced slurry has the following beneficial effects: the operation is simple and efficient, and the method is suitable for large-scale industrial production.
According to another aspect of the present invention, there is provided a ceramic fiber membrane reinforcing method comprising the steps of:
spraying: spraying the slurry on all or part of the surface of the ceramic fiber membrane by using a spraying device;
and (3) drying: drying for 1-2 h by microwave;
and (3) firing: keeping the temperature for 4-6 h at 600-1200 ℃.
Further, during spraying, the spraying equipment uniformly sprays the reinforcing liquid on the surface of the ceramic fiber membrane at the spraying amount of 240-300 g/min.
Further, the spraying apparatus includes:
a spraying device;
a feed system for supplying ceramic fiber membrane reinforcing slurry to the spraying device;
a bracket for placing the ceramic fiber membrane;
and the driving mechanism can drive the bracket to move relative to the discharge hole of the spraying device according to a preset track so that the spraying device can spray the ceramic fiber membrane reinforced slurry on the whole or part of the surface of the ceramic fiber membrane.
Furthermore, the spraying equipment also comprises a spraying control system, and the driving mechanism and the spraying device are in signal connection with the spraying control system.
Furthermore, the feeding system comprises a slurry storage tank and a delivery pump, and the slurry storage tank is communicated with the spraying device through a delivery pipe.
Furthermore, the driving mechanism comprises a conveying belt and a motor for driving the conveying belt to rotate, a sliding block is arranged on the conveying belt, and the sliding block is connected with the bracket.
Compared with the prior art, the ceramic fiber membrane reinforcing method has the following beneficial effects:
1. the blank body sprayed with the ceramic fiber membrane reinforced slurry is quickly dried by microwaves, so that the binder can be prevented from escaping, the texture structure is uniform, the production efficiency is improved, the blank body is fired once without being fired twice, the production period can be greatly prolonged, the production cost is reduced, and energy conservation and emission reduction are realized.
2. The spraying equipment has the advantages of simple operation, low manufacturing cost, adjustable spraying amount and spraying speed, simple and efficient operation and suitability for large-scale industrial production.
Drawings
FIG. 1 is a schematic view of the construction of the spray coating device of the present invention;
FIG. 2 is an embodiment of a spray coating device;
FIG. 3 is an SEM image of a ceramic fiber membrane of example 2 before reinforcement;
FIG. 4 is an SEM image of a reinforced ceramic fiber membrane of example 2;
FIG. 5 is an SEM image of a ceramic fiber membrane of example 3 before reinforcement
Fig. 6 is an SEM image of the ceramic fiber membrane of example 3 after reinforcement.
Reference numerals shown in the drawings: 1-a spraying device; 2-a feed system; 3-a bracket; 4-a drive mechanism; 41-a conveyor belt; 42-a motor; 43-a slide block; 44-a support frame; 45-buckling; 46-tubular fiber membrane material; 5-spraying control system.
Detailed Description
In order to better understand the technical scheme of the invention, the invention is further explained by combining the drawings and the specific embodiments in the specification.
Example 1:
a ceramic fiber membrane reinforced slurry comprises water, silica sol, water glass, boric acid, aluminum sol and aluminum dihydrogen phosphate solution which are mixed according to a certain proportion, and comprises 50-70 parts of water, 10-15 parts of silica sol, 3-5 parts of boric acid, 10-15 parts of water glass, 10-15 parts of aluminum sol and 5-10 parts of aluminum dihydrogen phosphate solution by weight, wherein the solid content of the slurry is 10-20%, and the silica sol is acidic and the solid content of the silica sol is 20% -40% by weight; the aluminum sol is acidic, and the solid content of the aluminum sol is 15-40%; the solid content of the aluminum dihydrogen phosphate solution is 15-30%.
The embodiment provides a preparation method of the ceramic fiber membrane reinforcing slurry, which comprises the following steps: 50-70 parts of water, 10-15 parts of silica sol, 3-5 parts of boric acid, 10-15 parts of water glass, 10-15 parts of aluminum sol and 5-10 parts of aluminum dihydrogen phosphate solution; and mixing and stirring for 0.5-3h to ensure that the solid content of the slurry is 10-20%, and preparing the slurry.
In this embodiment, the ceramic fiber membrane reinforcing method using the ceramic fiber membrane reinforcing slurry includes the following steps:
and step 3, firing: keeping the temperature for 4-6 h at 600-1200 ℃.
The spray coating device includes:
a spraying device 1;
the feeding system 2 is used for supplying ceramic fiber membrane reinforced slurry to the spraying device 1, the feeding system 2 comprises a slurry storage tank and a delivery pump, and the slurry storage tank is communicated with the spraying device 1 through a delivery pipe;
a bracket 3 for placing a ceramic fiber membrane;
the driving mechanism 4 can drive the bracket 3 to move relative to the discharge hole of the spraying device 1 according to a preset track, so that the spraying device 1 can spray the ceramic fiber membrane reinforced slurry on the whole or part of the surface of the ceramic fiber membrane;
the device also comprises a spraying control system 5, the driving mechanism 4 and the spraying device 1 are in signal connection with the spraying control system 5, through a control system, the driving mechanism 4 can drive the bracket 3 to move relative to the discharge hole of the spraying device 1 according to a preset track, further driving the ceramic fiber membrane, starting the spraying system, adjusting the spraying amount by controlling the moving speed and the spraying flow rate of the bracket 3, in the embodiment, the spraying equipment uniformly sprays the reinforcing liquid on all or part of the surface of the fiber membrane material at the spraying amount of 240-300 g/min, then the ceramic fiber membrane material is dried and sintered by microwave, the blank body after being sprayed with the ceramic fiber membrane reinforcing slurry is quickly dried by microwave, the binder can be ensured not to escape, the tissue structure is uniform, the production efficiency is improved, the binder can be fired once without secondary firing, the production period can be greatly prolonged, the production cost is reduced, and energy conservation and emission reduction are realized.
Example 2:
in this embodiment, taking the tubular fiber membrane material 46 as an example, sealing the bottom end of the tubular fiber membrane material 46, preparing ceramic fiber membrane reinforced slurry weighing 65 parts of water, 10 parts of silica sol, 5 parts of boric acid, 12 parts of alumina sol, 10-15 parts of water glass, and 8 parts of aluminum dihydrogen phosphate solution, mixing, placing in a stirrer, stirring for 1 hour to make the solid content of the slurry be 10-20%, and pouring into a slurry storage tank for later use.
As shown in fig. 2, this embodiment is for spraying tubular fibrous membrane material 46, the spraying apparatus comprising:
the spraying device 1 is characterized in that a spray gun is selected as the spraying device 1;
the feeding system 2 is used for supplying ceramic fiber membrane reinforced slurry to the spraying device 1, and specifically the feeding system 2 comprises a slurry storage tank and a delivery pump, wherein the slurry storage tank is communicated with the spraying device 1 through a delivery pipe;
the bracket 3 is used for placing the ceramic fiber membrane, and a buckle 45 used for fixing the tubular fiber membrane material 46 is arranged on the bracket 3;
the driving mechanism 4 comprises a supporting frame 44, a conveyor belt 41 arranged on the supporting frame 44 and a motor 42 for driving the conveyor belt 41 to rotate, wherein a sliding block 43 is arranged on the conveyor belt 41, and the sliding block 43 is connected with the bracket 3;
and the driving mechanism 4 and the spraying device 1 are in signal connection with the spraying control system 5.
In this embodiment, the ceramic fiber membrane reinforcing method using the ceramic fiber membrane reinforcing slurry includes the following steps:
and 2, drying: drying for 1h by microwave;
and step 3, firing: the temperature is kept at 600 ℃ for 6h, the porosity of the product is reduced by 3 percent, and the compression resistance is improved by 4 MPa.
Example 3:
in this embodiment, taking a tubular fiber membrane material 46 as an example, first, 50 parts of water, 10 parts of silica sol, 10 parts of aluminum sol, 5 parts of boric acid, 13 parts of water glass, and 10 parts of aluminum dihydrogen phosphate solution are weighed to prepare ceramic fiber membrane reinforced slurry, and after mixing, the ceramic fiber membrane reinforced slurry is placed in a stirrer to be stirred for 1 hour, so that the solid content of the slurry is 10 to 20%, and then the slurry is poured into a slurry storage tank for standby.
A spray coating device comprising: a spraying device 1;
the feeding system 2 is used for supplying ceramic fiber membrane reinforced slurry to the spraying device 1, the feeding system 2 comprises a slurry storage tank and a delivery pump, and the slurry storage tank is communicated with the spraying device 1 through a delivery pipe;
a bracket 3 for placing a ceramic fiber membrane;
the driving mechanism 4 comprises a synchronous belt pulley, a speed reducing motor 42 and a guide rail for moving the bracket 3, and is used for driving the bracket 3 to move relative to a discharge port of the spraying device 1 according to a preset track so that the spraying device 1 can spray the ceramic fiber membrane reinforced slurry on the whole or part of the surface of the ceramic fiber membrane;
the spraying device also comprises a spraying control system 5, the driving mechanism 4 and the spraying device 1 are in signal connection with the spraying control system 5, through the control system, the driving mechanism 4 can drive the bracket 3 to move relative to a discharge hole of the spraying device 1 according to a preset track, so as to drive the ceramic fiber membrane, start the spraying system, adjust the spraying amount by controlling the moving speed and the spraying flow rate of the bracket 3,
in this embodiment, the ceramic fiber membrane reinforcing method using the ceramic fiber membrane reinforcing slurry includes the following steps:
And 2, drying: drying for 2h by microwave;
and step 3, firing: the temperature is kept at 1200 ℃ for 4h, the porosity of the product is reduced by 3 percent, and the compression resistance is improved by 2 MPa.
Example 4:
in this embodiment, taking a tubular fiber membrane material 46 as an example, first, 70 parts of water, 10 parts of water glass, 15 parts of silica sol, 12 parts of alumina sol, 3 parts of boric acid and 7 parts of aluminum dihydrogen phosphate solution are prepared, mixed, placed in a stirrer and stirred for 2 hours to enable the solid content of the slurry to be 10-20%, and then poured into a slurry storage tank for standby.
A spray coating device comprising: a spraying device 1;
the feeding system 2 is used for supplying ceramic fiber membrane reinforced slurry to the spraying device 1, the feeding system 2 comprises a slurry storage tank and a delivery pump, and the slurry storage tank is communicated with the spraying device 1 through a delivery pipe;
a bracket 3 for placing a ceramic fiber membrane;
the driving mechanism 4 comprises a synchronous belt pulley, a speed reducing motor 42 and a guide rail for moving the bracket 3, and is used for driving the bracket 3 to move relative to a discharge port of the spraying device 1 according to a preset track so that the spraying device 1 can spray the ceramic fiber membrane reinforced slurry on the whole or part of the surface of the ceramic fiber membrane;
the spraying device also comprises a spraying control system 5, the driving mechanism 4 and the spraying device 1 are in signal connection with the spraying control system 5, through the control system, the driving mechanism 4 can drive the bracket 3 to move relative to a discharge hole of the spraying device 1 according to a preset track, so as to drive the ceramic fiber membrane, start the spraying system, adjust the spraying amount by controlling the moving speed and the spraying flow rate of the bracket 3,
in this embodiment, the ceramic fiber membrane reinforcing method using the ceramic fiber membrane reinforcing slurry includes the following steps:
And 2, drying: drying for 1.5h by microwave;
and step 3, firing: the temperature is kept for 5.5h at 1000 ℃, the porosity of the product is reduced by 2 percent, and the compression resistance is improved by 5 MPa.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. A method of reinforcing a ceramic fibre membrane, comprising the steps of:
spraying: spraying slurry on the whole or part of the inner surface of the ceramic fiber membrane by using spraying equipment, wherein the slurry comprises water, silica sol, water glass, boric acid, aluminum sol and aluminum dihydrogen phosphate solution which are mixed according to a certain proportion, and the solid content of the slurry is 10-20%; the coating comprises, by weight, 50-70 parts of water, 10-15 parts of silica sol, 3-5 parts of boric acid, 10-15 parts of water glass, 10-15 parts of aluminum sol and 5-10 parts of aluminum dihydrogen phosphate solution;
and (3) drying: drying for 1-2 h by microwave;
and (3) firing: preserving heat for 4-6 h at 600-1200 ℃;
the blank body sprayed with the ceramic fiber membrane reinforced slurry is dried by microwave, so that the binder can be prevented from escaping, and the ceramic fiber membrane reinforced slurry can be fired once without being fired twice.
2. The ceramic fiber membrane reinforcing method according to claim 1,
the silica sol is acidic, and the solid content of the silica sol is 20-30%;
and/or
The aluminum sol is acidic, and the solid content of the aluminum sol is 20-30%;
and/or
The solid content of the aluminum dihydrogen phosphate solution is 30-50%.
3. The method of claim 1, wherein the ceramic fiber membrane reinforcing slurry is prepared by a method comprising the steps of: 50-70 parts of water, 10-15 parts of silica sol, 3-5 parts of boric acid, 10-15 parts of water glass, 10-15 parts of aluminum sol and 5-10 parts of aluminum dihydrogen phosphate solution;
and mixing and stirring for 0.5-3h to ensure that the solid content of the slurry is 10-20%, thus preparing the slurry.
4. The method for reinforcing the ceramic fiber membrane according to claim 1, wherein the spraying equipment uniformly sprays the reinforcing liquid on the surface of the ceramic fiber membrane at a spraying amount of 240-300 g/min during spraying.
5. A ceramic fiber membrane reinforcement method according to claim 1, wherein the spray coating apparatus comprises:
a spraying device;
a feed system for supplying ceramic fiber membrane reinforcing slurry to the spraying device;
a bracket for placing the ceramic fiber membrane;
and the driving mechanism can drive the bracket to move relative to the discharge hole of the spraying device according to a preset track so that the spraying device can spray the ceramic fiber membrane reinforced slurry on the whole or part of the surface of the ceramic fiber membrane.
6. The ceramic fiber membrane reinforcing method according to claim 5, wherein the spraying device further comprises a spraying control system, and the driving mechanism and the spraying device are in signal connection with the spraying control system.
7. The method of claim 1, wherein the feed system comprises a slurry tank and a delivery pump, and the slurry tank is communicated with the spraying device through a delivery pipe.
8. A ceramic fiber membrane reinforcement method according to claim 1, wherein the driving mechanism comprises a conveyor belt, and a motor for driving the conveyor belt to rotate, the conveyor belt being provided with a slider, the slider being connected to the bracket.
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| CN111792908B (en) * | 2020-07-21 | 2022-04-26 | 福建龙净环保股份有限公司 | Ceramic fiber porous filter material reinforcing agent, preparation method thereof and ceramic fiber reinforcing material |
| CN115959930A (en) * | 2022-12-16 | 2023-04-14 | 辽宁省轻工科学研究院有限公司 | Surface coating of silicon-aluminum ceramic crucible and preparation method thereof |
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| CN101148366A (en) * | 2007-09-03 | 2008-03-26 | 武汉钢铁(集团)公司 | Dipping treatment solution for fire resistive material and carbon material |
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| CN1081395A (en) * | 1992-07-15 | 1994-02-02 | 国家建筑材料工业局山东工业陶瓷研究设计院 | Gradient ceramics with ceramic fibrous membrane fenestrata |
| US7927405B2 (en) * | 2007-04-23 | 2011-04-19 | Gore Enterprise Holdings, Inc | Porous composite article |
| CN108939697B (en) * | 2017-05-18 | 2021-03-16 | 山东工业陶瓷研究设计院有限公司 | Continuous fiber reinforced high-temperature ceramic fiber filter element and preparation method thereof |
| CN110256059B (en) * | 2019-06-12 | 2021-08-03 | 山东工业陶瓷研究设计院有限公司 | High-flux ceramic flat membrane and preparation method thereof |
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| CN101148366A (en) * | 2007-09-03 | 2008-03-26 | 武汉钢铁(集团)公司 | Dipping treatment solution for fire resistive material and carbon material |
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