CN111517766A - Method for manufacturing porous ceramic filter plate - Google Patents
Method for manufacturing porous ceramic filter plate Download PDFInfo
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- CN111517766A CN111517766A CN202010390442.7A CN202010390442A CN111517766A CN 111517766 A CN111517766 A CN 111517766A CN 202010390442 A CN202010390442 A CN 202010390442A CN 111517766 A CN111517766 A CN 111517766A
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- 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
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- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
- B01D33/17—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with rotary filtering tables
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- 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
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- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/08—Flat membrane modules
- B01D63/081—Manufacturing thereof
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
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- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
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Abstract
The invention relates to the technical field of ceramic filters, and discloses a manufacturing method of a porous ceramic filter plate, which comprises the following steps of preparing 100 parts of deionized water, 1-3 parts of aluminum isopropoxide analytical purity, 2-4 parts of nano-alumina powder and 0.1-0.5 part of 10% HNO3 solution chemical purity, and adding organic binder polyvinyl alcohol into raw material components of a nano-ceramic membrane. The manufacturing method of the porous ceramic filter plate adopts high-quality fused corundum aggregate and high-purity nano alumina micro powder as main components of a formula, and titanium dioxide and the like are added as mineralizers and Y-alumina or organic matters are added as pore-forming agents, so that the filter plate not only has relatively ideal porosity, proper micropore aperture and relatively good strength, but also can resist low-content hydrofluoric acid and working media with pH values of 8-14, and therefore, the ceramic filter plate which can be cleaned by using hydrofluoric acid and strong base and can be used for ore pulp dehydration and filtration containing a small amount of hydrofluoric acid (less than 0.2g/l) can be provided, which can not be achieved by other ceramic filter plates.
Description
Technical Field
The invention relates to the technical field of ceramic filters, in particular to a method for manufacturing a porous ceramic filter plate.
Background
The ceramic filter is a novel, high-efficiency and energy-saving solid-liquid separation device, which mainly comprises a ceramic filter plate, a roller system, a stirring system, a feeding and discharging system, a vacuum system, a filtrate discharge system, a scraping system, a back flushing system, a combined cleaning (ultrasonic cleaning and automatic acid preparation cleaning) system, a full-automatic control system, a tank body and a frame.
As a filter medium, micropores of a ceramic filter plate of the ceramic filter are blocked in the using process, so that a plurality of factors causing the blockage of the ceramic filter plate are provided, wherein one of the main factors is that fine particles contained in ore pulp enter into filter channels of the ceramic membrane along with the filtering process, so that the filtering capacity of the ceramic filter plate is greatly reduced, in order to prevent the filtering capacity of the ceramic filter plate from being weakened, the ceramic filter plate is periodically chemically cleaned and ultrasonically cleaned by the ceramic filter plate, so that the ceramic filter plate is recovered to a higher filtering level, but the cleaning is not thorough, and a small part of substances are remained, so that the ceramic plate is thoroughly blocked and scrapped along with the accumulation of blockage, the existing ceramic filter plate uses a micron-sized ceramic filter membrane, and the fine particles in the ore pulp easily enter into the channels of the ceramic membrane, so that the blockage process is caused, on one hand, the service life of the ceramic filter plate can be seriously influenced, the average service life of the existing ceramic plate is about one year, on the other hand, the use field of the ceramic plate is limited, and the micron-sized ceramic plate can not be suitable for ore pulp with fine granularity, so that the method for manufacturing the porous ceramic filter plate is provided to solve the problem.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for manufacturing a porous ceramic filter plate, which is characterized in that a nano ceramic filter membrane is coated on the surface of the porous ceramic filter plate, so that most of fine particles in ore pulp are effectively blocked, the ceramic plate is not easy to block, the service life of the ceramic plate is prolonged, the advantages of the ceramic filter are widened, the problem that cleaning is not thorough and a small amount of substance remains is solved, so the ceramic plate can be thoroughly blocked and scrapped along with accumulation of blocking objects, the existing ceramic filter plates all use micron-sized ceramic filter membranes, fine particles in the ore pulp can easily enter pore channels of the ceramic membrane, the blocking process is caused, on one hand, the service life of the ceramic filter plate is seriously influenced, the average service life of the existing ceramic plate is about one year, on the other hand, the use field of the ceramic plate is limited, and for ore, the micron-sized ceramic film cannot be applied.
(II) technical scheme
In order to realize the purposes that the nano ceramic filtering membrane is coated on the surface of the porous ceramic filtering plate, so that most of fine particles in ore pulp are effectively blocked, the ceramic plate is not easy to block, the service life of the ceramic plate is prolonged, and the ceramic filtering machine is widened, the invention provides the following technical scheme: the manufacturing method of the porous ceramic filter plate comprises the following steps:
1) preparing 100 parts of deionized water, 1-3 parts of analytically pure aluminum isopropoxide, 2-4 parts of nano-alumina powder and 0.1-0.5 part of chemically pure 10% HNO3 solution, adding organic binder polyvinyl alcohol into raw material components of the nano-ceramic membrane, taking 100 parts of deionized water as a reference, wherein the addition amount of the polyvinyl alcohol is 0.05-0.15 part, hydrolyzing aluminum isopropoxide according to the proportion, then carrying out peptization by using 10% HNO3 solution, then carrying out reflux aging to form aluminum sol, adding nano-alumina powder into the aluminum sol, mixing and dispersing to form uniform nano-membrane gel, uniformly coating the nano-membrane gel on the surface of a substrate by adopting a dip-coating method, drying and firing to obtain the nano-membrane gel;
2) hydrolyzing aluminum salt, heating deionized water to 80-90 ℃, adding aluminum isopropoxide at constant temperature, magnetically stirring for more than 1.5h, standing, slowly forming a precipitate, peptizing, heating to 85-95 'C, volatilizing isopropanol, adding 10% HNO3 solution at constant temperature as peptizing agent, re-dispersing the precipitate, refluxing and aging, pouring the solution into a reflux device, refluxing and aging for more than 24h at 85-95' C, and storing for later use;
3) the substrate comprises, by weight, 120 meshes of fused corundum, more than or equal to 99% (60-70%) of Al2O3, 60-400 nm of alumina powder, more than or equal to 99.9% (7-15%) of Al2O3, 0.25-0.5% of an additional organic binder and 25-40% of water, and the ceramic filter membrane comprises, by weight, 1-5 um of fused corundum, more than or equal to 99.2% (60-73%) of Al2O3, 60-400 nm of alumina powder, more than or equal to 99.9% (7-13%) of Al2O3, 1-5 um (0-10%) of a silicon-free pore former, less than or equal to 44um (17-30%) of a silicon-free ceramic raw material mineralizer, 0.25-0.5% of an additional organic binder and 25-40% of water;
4) uniformly mixing the raw materials according to a ratio, pressing the raw materials into a single filter plate, drying and bonding the single filter plate into a hollow structure, then putting the single filter plate into a kiln for sintering at the sintering temperature of 1400-1580 ℃, processing the plane of the sintered substrate to the required size, coating the peptizing agent prepared in the step 2) on the surface of the substrate, drying the substrate below 100 ℃, sintering the substrate at about 1200-1500 ℃, sealing and assembling to obtain a finished product, grinding the raw materials of the ceramic filter membrane for 6-8 hours by using a ball mill, and coating the ceramic membrane on the substrate to have the thickness of 0.1-0.4 mm.
Preferably, the concentration of the aluminum sol is changed by evaporation or water addition, namely the feed liquid is adjusted to be a uniformly dispersible system with the solid content of 4-5%.
Preferably, the concentration of the aluminum sol is changed by evaporation or water addition, namely the feed liquid is adjusted to be a uniformly dispersible system with the solid content of 4-5%.
Preferably, the PVA solution is added into the nano-film gel, ultrasonic dispersion is carried out for more than 2 hours, and then a magnetic stirrer is used for stirring for more than 2 hours.
Preferably, the dip-coating method is to remove the pollutants on the surface of the substrate, keep the surface of the dip-coating surface flat, smooth and clean, add a small amount of ethanol to remove air bubbles in the slurry, dip the substrate in the slurry, and slowly take out the substrate after dipping for a certain time.
Preferably, the drying of the coated product is drying the product at a constant temperature of 40 ℃ for more than 6h, and then heating to 100 ℃ for drying for more than 2 h.
Preferably, the dried product is fired to be placed in a kiln, the temperature is raised to 450' C within 5-8 hours, then the temperature is raised to 1200-1400C within 8-11 hours, the temperature is kept for 2-3 hours, and the product is naturally cooled to the room temperature.
Preferably, the silicon-free ceramic raw material mineralizer is one or a combination of more of titanium dioxide, carbonate and magnesium fluoride, the silicon-free pore former is gamma-alumina or carbon powder or a combination, the silicon-free pore former is Y-alumina with Al2O3 being more than or equal to 99.5%, the addition amount of the Y-alumina is 5-10%, and the organic binding agent is dextrin or PVA.
(III) advantageous effects
Compared with the prior art, the invention provides a method for manufacturing a porous ceramic filter plate, which has the following beneficial effects:
the manufacturing method of the porous ceramic filter plate adopts high-quality fused corundum aggregate and high-purity nano alumina micro powder as main components of a formula, titanium dioxide and the like are added as mineralizers, and Y-alumina or organic matters are added as pore forming agents, so that the filter plate not only has relatively ideal porosity (30-50%), proper micropore aperture (about 2 mu m) and relatively good strength (30-50 MPa), but also can resist low-content hydrofluoric acid (the concentration is less than 0.2g/1) and a working medium with the pH value of 8-14, and therefore the ceramic filter plate can be cleaned by using hydrofluoric acid and strong base and can be used for dewatering and filtering ore pulp containing a small amount of hydrofluoric acid (less than 0.2g/l), which cannot be achieved by other ceramic filter plates.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
1) preparing 100 parts of deionized water, 1-3 parts of analytically pure aluminum isopropoxide, 2-4 parts of nano-alumina powder and 0.1-0.5 part of chemically pure 10% HNO3 solution, adding organic binder polyvinyl alcohol into raw material components of the nano-ceramic membrane, taking 100 parts of deionized water as a reference, wherein the addition amount of the polyvinyl alcohol is 0.05-0.15 part, hydrolyzing aluminum isopropoxide according to the proportion, then carrying out peptization by using 10% HNO3 solution, then carrying out reflux aging to form aluminum sol, adding nano-alumina powder into the aluminum sol, mixing and dispersing to form uniform nano-membrane gel, uniformly coating the nano-membrane gel on the surface of a substrate by adopting a dip-coating method, drying and firing to obtain the nano-membrane gel;
2) hydrolyzing aluminum salt, heating deionized water to 80-90 ℃, adding aluminum isopropoxide at constant temperature, magnetically stirring for more than 1.5h, standing, slowly forming a precipitate, peptizing, heating to 85-95 'C, volatilizing isopropanol, adding 10% HNO3 solution at constant temperature as peptizing agent, re-dispersing the precipitate, refluxing and aging, pouring the solution into a reflux device, refluxing and aging for more than 24h at 85-95' C, and storing for later use;
3) the substrate comprises the following components in parts by weight, 100 meshes of fused corundum, more than or equal to 99% (65%) of Al2O3, 60-400 nm of alumina powder, more than or equal to 99.9% (15%) of Al2O3, 4% of additional barium carbonate, 4% of magnesium chloride, 0.2% of dextrin and 1.8% of water, wherein the ceramic filtering membrane comprises 1-5 um of fused corundum, more than or equal to 99.2% (60-73%) of Al2O3, 60-400 nm of alumina powder, more than or equal to 99.9% (7-13%) of Al2O3, 1-5 um (0-10%) of silicon-free pore former, less than or equal to 44um (17-30%) of silicon-free ceramic raw material mineralizer, 0.25-0.5% of additional organic binder and 25-40% of water;
4) uniformly mixing the raw materials according to a ratio, pressing the raw materials into a single filter plate, drying and bonding the single filter plate into a hollow structure, then putting the single filter plate into a kiln for sintering at the sintering temperature of 1400-1580 ℃, processing the plane of the sintered substrate to the required size, coating the peptizing agent prepared in the step 2) on the surface of the substrate, drying the substrate below 100 ℃, sintering the substrate at about 1200-1500 ℃, sealing and assembling to obtain a finished product, grinding the raw materials of the ceramic filter membrane for 6-8 hours by using a ball mill, and coating the ceramic membrane on the substrate to have the thickness of 0.1-0.4 mm.
After fully mixing, pressing and forming into a filter single sheet, drying and adhering the blank into a filter plate substrate with a hollow structure, sintering at 1400-1580 ℃, and mechanically processing to the required size.
Example two:
1) preparing 100 parts of deionized water, 1-3 parts of analytically pure aluminum isopropoxide, 2-4 parts of nano-alumina powder and 0.1-0.5 part of chemically pure 10% HNO3 solution, adding organic binder polyvinyl alcohol into raw material components of the nano-ceramic membrane, taking 100 parts of deionized water as a reference, wherein the addition amount of the polyvinyl alcohol is 0.05-0.15 part, hydrolyzing aluminum isopropoxide according to the proportion, then carrying out peptization by using 10% HNO3 solution, then carrying out reflux aging to form aluminum sol, adding nano-alumina powder into the aluminum sol, mixing and dispersing to form uniform nano-membrane gel, uniformly coating the nano-membrane gel on the surface of a substrate by adopting a dip-coating method, drying and firing to obtain the nano-membrane gel;
2) hydrolyzing aluminum salt, heating deionized water to 80-90 ℃, adding aluminum isopropoxide at constant temperature, magnetically stirring for more than 1.5h, standing, slowly forming a precipitate, peptizing, heating to 85-95 'C, volatilizing isopropanol, adding 10% HNO3 solution at constant temperature as peptizing agent, re-dispersing the precipitate, refluxing and aging, pouring the solution into a reflux device, refluxing and aging for more than 24h at 85-95' C, and storing for later use;
3) the substrate comprises 65 meshes of fused corundum, more than or equal to 99 percent (63 percent) of Al2O3, 60-400 nm of alumina powder, more than or equal to 99.9 percent (10 percent) of Al2O3, 8 percent of externally added nano alumina, 12 percent of titanium dioxide, 7 percent of barium carbonate and 32 percent of water, and the ceramic filter membrane comprises 1-5 um of fused corundum, more than or equal to 99.2 percent (60-73 percent) of Al2O3, 60-400 nm of alumina powder, more than or equal to 99.9 percent (7-13 percent) of Al2O3, 1-5 um (0-10 percent) of silicon-free pore-forming agent, less than or equal to 44um (17-30 percent) of silicon-free ceramic raw material mineralizer, 0.25-0.5 percent of externally added organic binder and 25-40 percent of;
4) uniformly mixing the raw materials according to a ratio, pressing the raw materials into a single filter plate, drying and bonding the single filter plate into a hollow structure, then putting the single filter plate into a kiln for sintering at the sintering temperature of 1400-1580 ℃, processing the plane of the sintered substrate to the required size, coating the peptizing agent prepared in the step 2) on the surface of the substrate, drying the substrate below 100 ℃, sintering the substrate at about 1200-1500 ℃, sealing and assembling to obtain a finished product, grinding the raw materials of the ceramic filter membrane for 6-8 hours by using a ball mill, and coating the ceramic membrane on the substrate to have the thickness of 0.1-0.4 mm.
Then adding about 0.4 part of methylcellulose and about 32 parts of water, mixing and ball-milling for 6-8 hours by a ball mill, uniformly coating a ceramic membrane with the thickness of 0.1-0.4mm on a substrate, drying under 100'C, firing at 1200-1500' C, sealing and assembling to obtain the finished product.
Example three:
1) preparing 100 parts of deionized water, 1-3 parts of analytically pure aluminum isopropoxide, 2-4 parts of nano-alumina powder and 0.1-0.5 part of chemically pure 10% HNO3 solution, adding organic binder polyvinyl alcohol into raw material components of the nano-ceramic membrane, taking 100 parts of deionized water as a reference, wherein the addition amount of the polyvinyl alcohol is 0.05-0.15 part, hydrolyzing aluminum isopropoxide according to the proportion, then carrying out peptization by using 10% HNO3 solution, then carrying out reflux aging to form aluminum sol, adding nano-alumina powder into the aluminum sol, mixing and dispersing to form uniform nano-membrane gel, uniformly coating the nano-membrane gel on the surface of a substrate by adopting a dip-coating method, drying and firing to obtain the nano-membrane gel;
2) hydrolyzing aluminum salt, heating deionized water to 80-90 ℃, adding aluminum isopropoxide at constant temperature, magnetically stirring for more than 1.5h, standing, slowly forming a precipitate, peptizing, heating to 85-95 'C, volatilizing isopropanol, adding 10% HNO3 solution at constant temperature as peptizing agent, re-dispersing the precipitate, refluxing and aging, pouring the solution into a reflux device, refluxing and aging for more than 24h at 85-95' C, and storing for later use;
3) the substrate comprises 65 meshes of fused corundum, more than or equal to 99% (60-70%) of Al2O3, 60-400 nm of alumina powder, more than or equal to 99.9% (7-15%) of Al2O3, 0.25-0.5% of an additional organic binder and 25-40% of water, and the ceramic filter membrane comprises 1-5 um of fused corundum, more than or equal to 99.2% (60-73%) of Al2O3, 60-400 nm of alumina powder, more than or equal to 99.9% (7-13%) of Al2O3, 1-5 um (0-10%) of a silicon-free pore former, less than or equal to 44um (17-30%) of a silicon-free ceramic raw material mineralizer, 0.25-0.5% of an additional organic binder and 25-40% of water;
4) uniformly mixing the raw materials according to a ratio, pressing the raw materials into a single filter plate, drying and bonding the single filter plate into a hollow structure, then putting the single filter plate into a kiln for sintering at the sintering temperature of 1400-1580 ℃, processing the plane of the sintered substrate to the required size, coating the peptizing agent prepared in the step 2) on the surface of the substrate, drying the substrate below 100 ℃, sintering the substrate at about 1200-1500 ℃, sealing and assembling to obtain a finished product, grinding the raw materials of the ceramic filter membrane for 6-8 hours by using a ball mill, and coating the ceramic membrane on the substrate to have the thickness of 0.1-0.4 mm.
The invention has the beneficial effects that: the manufacturing method of the porous ceramic filter plate adopts high-quality fused corundum aggregate and high-purity nano alumina micro powder as main components of a formula, titanium dioxide and the like are added as mineralizers, and Y-alumina or organic matters are added as pore forming agents, so that the filter plate not only has relatively ideal porosity (30-50%), proper micropore aperture (about 2 mu m) and relatively good strength (30-50 MPa), but also can resist low-content hydrofluoric acid (the concentration is less than 0.2g/1) and a working medium with the pH value of 8-14, and therefore the ceramic filter plate can be cleaned by using hydrofluoric acid and strong base and can be used for dewatering and filtering ore pulp containing a small amount of hydrofluoric acid (less than 0.2g/l), which cannot be achieved by other ceramic filter plates.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The manufacturing method of the porous ceramic filter plate is characterized by comprising the following steps:
1) preparing 100 parts of deionized water, 1-3 parts of analytically pure aluminum isopropoxide, 2-4 parts of nano-alumina powder and 0.1-0.5 part of chemically pure 10% HNO3 solution, adding organic binder polyvinyl alcohol into raw material components of the nano-ceramic membrane, taking 100 parts of deionized water as a reference, wherein the addition amount of the polyvinyl alcohol is 0.05-0.15 part, hydrolyzing aluminum isopropoxide according to the proportion, then carrying out peptization by using 10% HNO3 solution, then carrying out reflux aging to form aluminum sol, adding nano-alumina powder into the aluminum sol, mixing and dispersing to form uniform nano-membrane gel, uniformly coating the nano-membrane gel on the surface of a substrate by adopting a dip-coating method, drying and firing to obtain the nano-membrane gel;
2) hydrolyzing aluminum salt, heating deionized water to 80-90 ℃, adding aluminum isopropoxide at constant temperature, magnetically stirring for more than 1.5h, standing, slowly forming a precipitate, peptizing, heating to 85-95 'C, volatilizing isopropanol, adding 10% HNO3 solution at constant temperature as peptizing agent, re-dispersing the precipitate, refluxing and aging, pouring the solution into a reflux device, refluxing and aging for more than 24h at 85-95' C, and storing for later use;
3) the substrate comprises, by weight, 120 meshes of fused corundum, more than or equal to 99% (60-70%) of Al2O3, 60-400 nm of alumina powder, more than or equal to 99.9% (7-15%) of Al2O3, 0.25-0.5% of an additional organic binder and 25-40% of water, and the ceramic filter membrane comprises, by weight, 1-5 um of fused corundum, more than or equal to 99.2% (60-73%) of Al2O3, 60-400 nm of alumina powder, more than or equal to 99.9% (7-13%) of Al2O3, 1-5 um (0-10%) of a silicon-free pore former, less than or equal to 44um (17-30%) of a silicon-free ceramic raw material mineralizer, 0.25-0.5% of an additional organic binder and 25-40% of water;
4) uniformly mixing the raw materials according to a ratio, pressing the raw materials into a single filter plate, drying and bonding the single filter plate into a hollow structure, then putting the single filter plate into a kiln for sintering at the sintering temperature of 1400-1580 ℃, processing the plane of the sintered substrate to the required size, coating the peptizing agent prepared in the step 2) on the surface of the substrate, drying the substrate below 100 ℃, sintering the substrate at about 1200-1500 ℃, sealing and assembling to obtain a finished product, grinding the raw materials of the ceramic filter membrane for 6-8 hours by using a ball mill, and coating the ceramic membrane on the substrate to have the thickness of 0.1-0.4 mm.
2. The method of manufacturing a filter plate according to claim 1, wherein: the concentration of the alumina sol is changed by evaporation or water addition, namely the feed liquid is adjusted to be a uniformly dispersible system with solid content of 4-5%.
3. The method of manufacturing a filter plate according to claim 2, wherein: the concentration of the alumina sol is changed by evaporation or water addition, namely the feed liquid is adjusted to be a uniformly dispersible system with solid content of 4-5%.
4. The method of manufacturing a filter plate according to claim 2, wherein: and adding a PVA solution into the nano-film gel, performing ultrasonic dispersion for more than 2 hours, and stirring for more than 2 hours by using a magnetic stirrer.
5. The method of manufacturing a filter plate according to claim 1, wherein: the dip-coating method is to remove the pollutants on the surface of the substrate, keep the surface of the dip-coating surface flat, smooth and clean, add a small amount of ethanol to remove the bubbles in the slurry, dip the substrate into the slurry, and slowly take out the substrate after dipping for a certain time.
6. The method of manufacturing a filter plate according to claim 1, wherein: and the drying of the coated product is to dry the product at the constant temperature of 40 ℃ for more than 6h, and then to dry the product at the temperature of 100 ℃ for more than 2 h.
7. The method of manufacturing a filter plate according to claim 1, wherein: and firing the dried product to obtain a product, placing the product in a kiln, heating to 450' C within 5-8 hours, then heating to 1200-1400C within 8-11 hours, preserving heat for 2-3 hours, and naturally cooling to room temperature.
8. The method of manufacturing a filter plate according to claim 1, wherein: the silicon-free ceramic raw material mineralizer is one or a combination of titanium dioxide, carbonate and magnesium fluoride, the silicon-free pore former is gamma-alumina or carbon powder or a combination, the silicon-free pore former is Y-alumina with Al2O3 being more than or equal to 99.5%, the addition amount of the Y-alumina is 5-10%, and the organic binding agent is dextrin or PVA.
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| CN113644379A (en) * | 2021-01-18 | 2021-11-12 | 华南理工大学 | Porous ceramic fiber diaphragm material for thermal battery and preparation method thereof |
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Application publication date: 20200811 |