CN114699933A - Novel flat ceramic microfiltration membrane - Google Patents
Novel flat ceramic microfiltration membrane Download PDFInfo
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- CN114699933A CN114699933A CN202210314273.8A CN202210314273A CN114699933A CN 114699933 A CN114699933 A CN 114699933A CN 202210314273 A CN202210314273 A CN 202210314273A CN 114699933 A CN114699933 A CN 114699933A
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- 239000012528 membrane Substances 0.000 title claims abstract description 79
- 239000000919 ceramic Substances 0.000 title claims abstract description 54
- 238000001471 micro-filtration Methods 0.000 title claims abstract description 49
- 239000010410 layer Substances 0.000 claims abstract description 24
- 239000002346 layers by function Substances 0.000 claims abstract description 16
- 239000011148 porous material Substances 0.000 claims abstract description 15
- 238000012216 screening Methods 0.000 claims abstract description 9
- 238000005266 casting Methods 0.000 claims description 44
- 239000002002 slurry Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 32
- 238000000498 ball milling Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 239000011230 binding agent Substances 0.000 claims description 18
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- 239000000843 powder Substances 0.000 claims description 17
- 239000002270 dispersing agent Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 15
- 239000002518 antifoaming agent Substances 0.000 claims description 14
- 238000011282 treatment Methods 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 10
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 9
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical group OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 8
- 238000007731 hot pressing Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
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- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229920002678 cellulose Polymers 0.000 claims description 2
- 239000001913 cellulose Substances 0.000 claims description 2
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- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 239000002253 acid Substances 0.000 abstract description 5
- 239000003513 alkali Substances 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
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- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
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- B01D71/025—Aluminium oxide
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
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- B01D71/024—Oxides
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Abstract
The invention discloses a novel flat ceramic microfiltration membrane, which relates to the technical field of membrane separation, and comprises a microporous functional layer positioned in the middle and gradient symmetrical porous layers positioned on two sides, wherein the porosity of the gradient symmetrical porous layers is gradually increased from the inner side to the outer side, the pore diameter of the microporous functional layer is 0.08-12 mu m, the thickness of the microporous functional layer is 45-55 mu m, the pore diameters of the gradient symmetrical porous layers are all larger than 9 mu m, and the thickness of the gradient symmetrical porous layers is 1200 mu m. The microporous functional layer is positioned in the middle to play a role in screening, the gradient porous layers on the two sides play a role in supporting, the mechanical strength of the microfiltration membrane is enhanced, the service life of the membrane is greatly prolonged, and the gradient porous layers on the two sides play a role in protecting the functional layer, so that the microfiltration membrane can keep stable performance for a long time in severe environments such as strong acid, strong alkali and the like.
Description
Technical Field
The invention relates to the technical field of membrane separation, in particular to a novel flat ceramic microfiltration membrane.
Background
The microfiltration technology is a process of separating each component in a solution by using a porous material as a separation medium under the driving of pressure by utilizing a micro-pore screening mechanism of a microfiltration membrane. When the micro-porous membrane is applied to water treatment, small-sized substances such as water, organic low molecules, inorganic ions and the like in the solution can reach the other side of the membrane through the micro-pores, large-sized substances such as thalli, colloids, particles, organic macromolecules and the like in the solution cannot pass through the micro-pores, and the aim of screening different components in the solution is fulfilled by utilizing the micro-pore screening mechanism. The microfiltration membrane separation technology has low operation pressure, is green and environment-friendly, has no by-product, and is widely applied to the industries of water treatment, medicine, food, paint, biotechnology and the like.
Microfiltration membranes are classified into organic polymeric membranes, ceramic membranes and metal membranes according to membrane forming materials, however, three types of membranes have defects in industrial application: for example, the organic polymer film has the problems of no acid and alkali corrosion resistance, poor high temperature and high pressure resistance, no organic solvent resistance and the like; the ceramic membrane has the problems of poor mechanical strength and difficult welding; the metal film has the problems of poor high-temperature oxidation resistance and poor acid-base corrosion resistance, and the wide application of the three films is greatly limited.
At present, the research on the micro-filtration membrane is still based on the surface modification treatment of the existing material, so as to improve the properties of the membrane material, such as strength, pollution resistance, acid and alkali corrosion resistance, but the effect is very little. Therefore, in order to solve the above problems, the present invention provides a novel flat ceramic microfiltration membrane and a preparation method thereof.
Disclosure of Invention
Objects of the invention
In view of the above, the present invention is directed to a novel flat ceramic microfiltration membrane, so as to solve the existing problems in use and preparation of the ceramic microfiltration membrane, simplify the preparation process of the ceramic microfiltration membrane, enable continuous production, and reduce the cost.
(II) technical scheme
In order to achieve the above technical objects, the present invention provides a novel flat ceramic microfiltration membrane:
the microporous membrane comprises a microporous functional layer in the middle and gradient symmetrical porous layers on two sides, wherein the porosity of the gradient symmetrical porous layers gradually increases from the inner side to the outer side, the pore diameter of the microporous functional layer is 0.08-12 mu m, the thickness of the microporous functional layer is 45-55 mu m, the pore diameters of the gradient symmetrical porous layers are all larger than 9 mu m, and the thickness of the gradient symmetrical porous layers is 450-1200 mu m.
Preferably, the pore diameter of the microporous functional layer is 0.1-10 μm, the thickness is 50 μm, the pore diameters of the gradient symmetric porous layers are all larger than 10 μm, and the thickness is 500-1000 μm.
On the other hand, the preparation method of the novel flat plate ceramic microfiltration membrane comprises the following preparation steps:
the method comprises the following steps: mixing and ball-milling ceramic powder, a dispersing agent and deionized water for 5-10h, sequentially adding a binder, a plasticizer and a defoaming agent, continuing ball-milling for 10-12h, and carrying out screening and defoaming treatment to obtain casting slurry 1;
step two: mixing and ball-milling ceramic powder, a pore-forming agent, a dispersing agent and deionized water for 5-10h, sequentially adding a binder, a plasticizer and a defoaming agent, continuing ball-milling for 10-12h, and performing screening and defoaming treatment to obtain porous layer casting slurry; preparing three porous layer casting slurries added with pore-forming agents in different proportions, wherein the addition amount of the pore-forming agents is determined by the mass percentage of the ceramic powder, and the three porous layer casting slurries are casting slurry 2 added with 20 wt% of the pore-forming agents, casting slurry 3 added with 30 wt% of the pore-forming agents and casting slurry 4 added with 40 wt% of the pore-forming agents respectively;
step three: preparing 4 kinds of casting slurry prepared in the first step and the second step into 4 kinds of membrane green bodies by adopting a water-based casting method, and sequentially naming the 4 kinds of membrane green bodies as a green body 1, a green body 2, a green body 3 and a green body 4;
step four: sequentially stacking the 4 membrane green blanks prepared in the step three according to a green blank 4, a green blank 3, a green blank 2, a green blank 1, a green blank 2, a green blank 3 and a green blank 4, and then preparing a flat ceramic microfiltration membrane green blank by adopting a hot pressing method;
step five: sintering the flat ceramic microfiltration membrane green blank obtained in the fourth step by using a muffle furnace, wherein the sintering procedure is divided into two steps, the temperature is slowly raised to 500-plus-materials at 700 ℃ for 1-2h for removing the glue, and the temperature is slowly raised to 1000-plus-materials at 2000 ℃ for 5-10 h.
Preferably, the ceramic powder used in the first step and the second step includes Al2O3、Zr02、Ti02And Si02。
Preferably, the pore-forming agent added in the second step includes one or more of graphite, starch, cellulose, polystyrene microspheres and polymethyl methacrylate microspheres.
Preferably, the ceramic casting slurry prepared in the first step and the second step comprises 40-50 wt% of ceramic casting slurry, 0.8-1 wt% of dispersant, 28-32 wt% of water, 4-6 wt% of binder, 4-6 wt% of plasticizer and 0.3-0.6 wt% of defoaming agent.
Preferably, the ceramic casting slurry prepared in the first step and the second step comprises 40-50 wt% of ceramic casting slurry, 1 wt% of dispersant, 30 wt% of water, 5 wt% of binder, 5 wt% of plasticizer and 0.5 wt% of defoaming agent.
Preferably, the addition amount of the pore-forming agent in the second step accounts for 10-40 wt% of the mass of the ceramic powder.
Preferably, when the hot pressing method is adopted to prepare the flat ceramic microfiltration membrane green body in the fourth step, the operation temperature is 80-100 ℃, the operation pressure is 1-10Mpa, and the pressure maintaining time is controlled to be 5-10 min.
Preferably, the dispersant is a TEA solution, the binder is a PVA binder, the defoamer is a PPG defoamer, and the plasticizer is a PEG2000 plasticizer.
According to the technical scheme, the method has the following beneficial effects:
1. the microporous functional layer is positioned in the middle to play a role in screening, and the gradient porous layers on the two sides play a role in supporting, so that the mechanical strength of the microfiltration membrane is enhanced, and the service life of the membrane is greatly prolonged.
2. The gradient porous layers on the two sides play a role in protecting the functional layer, so that the micro-filtration membrane can keep stable performance for a long time under severe environments such as strong acid, strong alkali and the like.
3. The flat ceramic microfiltration membrane is prepared by combining a water-based tape casting method with a laminating and hot-pressing technology, so that the total structure is controllable, and the microporous functional layer in the middle of the structure is thin and has good separation performance.
4. The combination of stable chemical performance and the regeneration performance of the micro-filtration membrane makes the micro-filtration membrane have greater potential in various water treatments.
The invention not only can effectively control the aperture size of the microfiltration membrane and improve the filtration precision of the microfiltration membrane, but also improves the mechanical strength, acid and alkali corrosion resistance and other properties of the membrane, and is suitable for being used by a push rod.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a ceramic microfiltration membrane prepared by the present invention;
FIG. 2 is a structural view of a ceramic microfiltration membrane prepared according to the present invention;
FIG. 3 is a scanning electron micrograph of a ceramic microfiltration membrane according to example 1 of the invention.
Detailed Description
The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, identical or similar reference numerals indicate identical or similar parts and features. The drawings are only schematic representations of the concepts and principles of the embodiments of the disclosure, and do not necessarily show specific dimensions or proportions of the various embodiments of the disclosure. Certain features that are part of a particular figure may be exaggerated in order to illustrate relevant details or structures of embodiments of the present disclosure.
Referring to FIGS. 1-3:
the first embodiment is as follows:
the method comprises the following steps: first, 10g of alpha-AL is weighed2O3Powder and high speed grinding pretreatment, alpha-AL after grinding treatment2O3Adding 1 wt% of dispersing agent (TEA solution) into the powder, adding 30 wt% of deionized water, mixing and ball-milling for 10h by using zirconia, sequentially adding 4.5 wt% of plasticizer (PEG2000), 4.5 wt% of binder (PVA) and 0.1 wt% of defoaming agent (PPG), continuously mixing and ball-milling for 12h, sieving by using a 200-mesh sieve after ball-milling is finished, and then carrying out vacuum defoaming,obtaining casting slurry 1;
step two: 10g of alpha-AL are weighed2O3Adding 20 wt% of pore-forming agent (corn starch), 2 wt% of dispersing agent (TEA solution) and 35 wt% of deionized water into the powder, mixing and ball-milling the mixture for 10 hours, sequentially adding 4.5 wt% of plasticizer (PEG2000), 4.5 wt% of binder (PVA) and 0.1 wt% of defoaming agent (PPG), continuously mixing and ball-milling the mixture for 12 hours, sieving the mixture by using a 200-mesh sieve after the ball-milling is finished, and then carrying out vacuum defoaming to obtain casting slurry 2; the adding amount of the pore-forming agent in the step is increased to 30 wt% and 40 wt%, and then the casting slurry 3 and the casting slurry 4 can be obtained
Step three: preparing 4 kinds of casting slurry prepared in the first step and the second step into 4 kinds of membrane green bodies by adopting a water-based casting method, and sequentially naming the 4 kinds of membrane green bodies as a green body 1, a green body 2, a green body 3 and a green body 4;
step four: sequentially laminating the 4 membrane green bodies prepared in the third step according to a green body 4, a green body 3, a green body 2, a green body 1, a green body 2, a green body 3 and a green body 4, and preparing a novel flat ceramic microfiltration membrane green body by adopting a hot pressing method, wherein the operation temperature is 90 ℃, the operation pressure is 5Mpa, and the pressure maintaining time is controlled to be 5 min;
step five: sintering the flat ceramic microfiltration membrane green blank obtained in the fourth step by using a muffle furnace, wherein the sintering procedure is divided into three steps, the temperature is raised to 550 ℃ at 1 ℃/min in the first step and is kept for 2h, the glue discharging treatment is carried out, the temperature is kept for about 10h from 2 ℃/min to 1250 ℃ in the second step, the key of membrane forming and densification is realized, and the temperature is lowered to room temperature at 1 ℃/min in the third step, so that the flat ceramic microfiltration membrane with the novel symmetrical structure is obtained, and the total thickness is 800 mu m;
the second embodiment:
the method comprises the following steps: first, 5g of Zr0 was weighed2Adding 2 wt% of dispersing agent (TEA solution) into powder, adding 35 wt% of deionized water, mixing and ball-milling for 10 hours by using zirconia, sequentially adding 4.8 wt% of plasticizer (PEG2000), 4.8 wt% of binder (PVA) and 0.15 wt% of defoaming agent (PPG), continuously mixing and ball-milling for 12 hours, sieving by using a 200-mesh sieve after ball-milling, and performing vacuum defoaming to obtain casting slurry 1;
step two: weighing 5g of Zr02Powder, and 20 wt% pore-forming agent is added into the powderMixing and ball-milling (graphite), 2 wt% of dispersant (TEA solution) and 36 wt% of deionized water for 10 hours, sequentially adding 5 wt% of plasticizer (PEG2000), 5 wt% of binder (PVA) and 0.15 wt% of defoaming agent (PPG), continuously mixing and ball-milling for 12 hours, sieving by using a 200-mesh sieve after ball-milling is finished, and then carrying out vacuum defoaming to obtain casting slurry 2; and increasing the addition amount of the pore-forming agent in the step to 30 wt% and 40 wt% to obtain casting slurry 3 and casting slurry 4.
Step three: preparing 4 kinds of casting slurry prepared in the first step and the second step into 4 kinds of membrane green bodies by adopting a water-based casting method, and sequentially naming the 4 kinds of membrane green bodies as a green body 1, a green body 2, a green body 3 and a green body 4;
step four: sequentially laminating the 4 membrane green bodies prepared in the third step according to a green body 4, a green body 3, a green body 2, a green body 1, a green body 2, a green body 3 and a green body 4, and preparing a novel flat ceramic microfiltration membrane green body by adopting a hot pressing method, wherein the operation temperature is 95 ℃, the operation pressure is 8Mpa, and the pressure maintaining time is controlled to be 6 min;
step five: sintering the flat ceramic microfiltration membrane green blank obtained in the fourth step by using a muffle furnace, wherein the sintering procedure is divided into three steps, the first step is carried out by heating to 700 ℃ at room temperature at 1 ℃/min and carrying out heat preservation for 2h, the second step is carried out by keeping the temperature from 2 ℃/min to 1550 ℃ for 10h, the step is the key of membrane forming and densification, and the third step is carried out by cooling to room temperature at 1 ℃/min to obtain a novel flat microfiltration membrane with a symmetrical structure, wherein the total thickness is 1000 mu m;
example three:
the method comprises the following steps: first, 10g of Ti0 was weighed2Adding 1.5 wt% of dispersant (TEA solution) into the powder, adding 32 wt% of deionized water, mixing and ball-milling for 10 hours by using zirconia, sequentially adding 4.5 wt% of plasticizer (PEG2000), 4.5 wt% of binder (PVA) and 0.1 wt% of defoaming agent (PPG), continuously mixing and ball-milling for 12 hours, sieving by using a 200-mesh sieve after ball-milling is finished, and then carrying out vacuum defoaming to obtain casting slurry 1;
step two: weighing 10g of Ti02 powder, adding 20 wt% of pore-forming agent (polystyrene microspheres), 2 wt% of dispersing agent (TEA solution) and 35 wt% of deionized water, mixing and ball-milling for 10 hours, sequentially adding 4.5 wt% of plasticizer (PEG2000), 4.5 wt% of binder (PVA) and 0.1 wt% of defoaming agent (PPG), continuously mixing and ball-milling for 12 hours, sieving by using a 200-mesh sieve after ball-milling is finished, and then carrying out vacuum defoaming to obtain casting slurry 2; the adding amount of the pore-forming agent in the step is increased to 30 wt% and 40 wt%, and then the casting slurry 3 and the casting slurry 4 can be obtained
Step three: preparing 4 kinds of casting slurry prepared in the first step and the second step into 4 kinds of membrane green bodies by adopting a water-based casting method, and sequentially naming the 4 kinds of membrane green bodies as a green body 1, a green body 2, a green body 3 and a green body 4;
step four: sequentially laminating the 4 membrane green bodies prepared in the third step according to a green body 4, a green body 3, a green body 2, a green body 1, a green body 2, a green body 3 and a green body 4, and preparing a novel flat ceramic microfiltration membrane green body by adopting a hot pressing method, wherein the operation temperature is 85 ℃, the operation pressure is 6Mpa, and the pressure maintaining time is controlled to be 8 min;
step five: and (3) sintering the flat ceramic microfiltration membrane green blank obtained in the fourth step by using a muffle furnace, wherein the sintering procedure is divided into three steps, the temperature is raised to 450 ℃ at 1 ℃/min in the first step, the temperature is kept for 2h, the glue discharging treatment is carried out, the temperature is kept for about 10h from 2 ℃/min to 1350 ℃ in the second step, the key of membrane forming and densification is realized, and the temperature is lowered to room temperature at 1 ℃/min in the third step, so that the flat microfiltration membrane with the novel symmetrical structure is obtained, and the total thickness is 1000 microns.
Exemplary embodiments of the proposed solution of the present disclosure have been described in detail above with reference to preferred embodiments, however, it will be understood by those skilled in the art that many variations and modifications may be made to the specific embodiments described above, and that many combinations of the various technical features and structures presented in the present disclosure may be made without departing from the concept of the present disclosure, without departing from the scope of the present disclosure, which is defined by the appended claims.
Claims (10)
1. The novel flat plate ceramic microfiltration membrane is characterized by comprising a microporous functional layer in the middle and gradient symmetrical porous layers on two sides, wherein the porosity of the gradient symmetrical porous layers is gradually increased from the inner side to the outer side, the pore diameter of the microporous functional layer is 0.08-12 mu m, the thickness of the microporous functional layer is 45-55 mu m, the pore diameter of each gradient symmetrical porous layer is larger than 9 mu m, and the thickness of each gradient symmetrical porous layer is 450-1200 mu m.
2. The novel flat-plate ceramic microfiltration membrane according to claim 1, wherein the pore diameter of the microporous functional layer is 0.1-10 μm, the thickness is 50 μm, the pore diameter of the gradient symmetric porous layer is more than 10 μm, and the thickness is 500-1000 μm.
3. The preparation method of the novel flat ceramic microfiltration membrane is characterized by comprising the following preparation steps:
the method comprises the following steps: mixing and ball-milling ceramic powder, a dispersing agent and deionized water for 5-10h, sequentially adding a binder, a plasticizer and a defoaming agent, continuing ball-milling for 10-12h, and carrying out screening and defoaming treatment to obtain casting slurry 1;
step two: mixing and ball-milling ceramic powder, a pore-forming agent, a dispersing agent and deionized water for 5-10h, sequentially adding a binder, a plasticizer and a defoaming agent, continuing ball-milling for 10-12h, and performing screening and defoaming treatment to obtain porous layer casting slurry; preparing three porous layer casting slurries added with pore-forming agents in different proportions, wherein the addition amount of the pore-forming agent is determined by the mass percent of the ceramic powder, and the three porous layer casting slurries are respectively a casting slurry 2 added with 20 wt% of the pore-forming agent, a casting slurry 3 added with 30 wt% of the pore-forming agent and a casting slurry 4 added with 40 wt% of the pore-forming agent;
step three: preparing 4 kinds of casting slurry prepared in the first step and the second step into 4 kinds of membrane green bodies by adopting a water-based casting method, and sequentially naming the 4 kinds of membrane green bodies as a green body 1, a green body 2, a green body 3 and a green body 4;
step four: sequentially stacking the 4 membrane green blanks prepared in the step three according to a green blank 4, a green blank 3, a green blank 2, a green blank 1, a green blank 2, a green blank 3 and a green blank 4, and then preparing a flat ceramic microfiltration membrane green blank by adopting a hot pressing method;
step five: sintering the flat ceramic microfiltration membrane green blank obtained in the fourth step by using a muffle furnace, wherein the sintering procedure is divided into two steps, the temperature is slowly raised to 500-plus-materials at 700 ℃ for 1-2h for removing the glue, and the temperature is slowly raised to 1000-plus-materials at 2000 ℃ for 5-10 h.
4. The method as claimed in claim 3, wherein the ceramic powder used in the first and second steps comprises Al2O3、Zr02、Ti02And Si02。
5. The method as claimed in claim 3, wherein the pore-forming agent added in step two comprises one or more of graphite, starch, cellulose, polystyrene microspheres and polymethyl methacrylate microspheres.
6. The method for preparing a novel flat ceramic microfiltration membrane according to claim 5, wherein the ceramic casting slurry prepared in the first and second steps comprises 40-50 wt% of ceramic casting slurry, 0.8-1 wt% of dispersant, 28-32 wt% of water, 4-6 wt% of binder, 4-6 wt% of plasticizer and 0.3-0.6 wt% of defoaming agent.
7. The method for preparing a novel flat ceramic microfiltration membrane according to claim 6, wherein the ceramic casting slurry prepared in the first and second steps comprises 40-50 wt% of ceramic casting slurry, 1 wt% of dispersant, 30 wt% of water, 5 wt% of binder, 5 wt% of plasticizer and 0.5 wt% of defoaming agent.
8. The method as claimed in claim 3, wherein the pore-forming agent is added in an amount of 10-40 wt% based on the mass of the ceramic powder.
9. The method for preparing a novel flat-plate ceramic microfiltration membrane according to claim 3, wherein the operation temperature is 80-100 ℃, the operation pressure is 1-10Mpa, and the pressure holding time is controlled within 5-10min when the hot pressing method is adopted to prepare the flat-plate ceramic microfiltration membrane green body in the fourth step.
10. The method for preparing a novel flat-plate ceramic microfiltration membrane according to any one of claims 3 to 8, wherein the dispersant is a TEA solution, the binder is a PVA binder, the defoamer is a PPG defoamer, and the plasticizer is a PEG2000 plasticizer.
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| CN101323528A (en) * | 2008-07-15 | 2008-12-17 | 南京工业大学 | Preparation of continuous hole graded ceramic tube |
| CN108079788A (en) * | 2017-12-27 | 2018-05-29 | 肖汉宁 | A kind of preparation method of asymmetric flat ceramic NF membrane |
| CN111085112A (en) * | 2019-12-04 | 2020-05-01 | 昆明理工大学 | Gradient porous self-supporting symmetrical ceramic membrane, preparation method and application thereof |
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| WO2002046122A1 (en) * | 2000-12-07 | 2002-06-13 | L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et Exploitation Des Procedes Georges Claude | Method for preparing a thin ceramic material with controlled surface porosity gradient, and resulting ceramic material |
| CN101323528A (en) * | 2008-07-15 | 2008-12-17 | 南京工业大学 | Preparation of continuous hole graded ceramic tube |
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