KR20120076073A - Ceramics filter and manufacturing method thereby - Google Patents

Abstract

PURPOSE: A ceramic filter and a method for manufacturing the same are provided to keep the practical intensity of the ceramic filter for a long period of time and to save cost required for manufacturing processes by implement a low energy-based plasticizing process. CONSTITUTION: A ceramic filter includes a porous ceramic base, an intermediate filtering film, and an upper filtering film. The intermediate filtering film is obtained by applying the mixed slurry of titanium dioxide and porous silicon dioxide on the filtering surface of the porous ceramic base and by plasticizing the slurry. The porous ceramic base is obtained by mixing porous silicon dioxide, titanium dioxide, clay powder, organic additives, and water and by shaping and plasticizing the mixture. The upper filtering film is obtained by applying a titanium dioxide sol solution on the intermediate filtering film and plasticizing the sol solution.

Description

Ceramic filter and manufacturing method thereof

The present invention relates to a ceramic filter excellent in filtration performance and backwashing effect and a method of manufacturing the same.

Ceramic filters have excellent heat resistance, durability, and fouling resistance compared to organic polymer membrane filters, and thus are usefully used in various industrial fields as filters for water treatment and liquid or gas filtration.

A number of patents have been proposed for ceramic filters.

Patent registration No. 10-0861078 relates to an asymmetric multilayer ceramic filter, a method of manufacturing the same and a water purification system using the same, the asymmetric multilayer ceramic filter, a cylindrical multilayer ceramic filter, a cylindrical ceramic support layer; At least one ceramic coating layer laminated on the surface of the ceramic support layer, wherein each layer of the ceramic filter has an average pore size of an outer layer of 1/5 to 1/20 of an average pore size of an adjacent inner layer, and an average pore size of an outermost layer. Is 40 nm to 0.2 占 퐉, and each layer of the ceramic filter is characterized by containing silver nanoparticles distributed throughout its volume. And it is described that the ceramic used as a base material of a filter uses alumina powder. When the filter base material is made of alumina, it is relatively finely divided and is sold in a state of uniform quality, so that pore control of the desired filter can be easily performed. There was an advantage that can be. However, although the alumina ceramic substrate has a sintering temperature of the alumina depending on the particle size and the sintering aid, the pores are not distributed in the alumina itself. Since high-temperature firing is required, sufficient bonding strength cannot be secured unless firing at 1350-1750 ° C., which leads to a process that consumes high thermal energy.

As such, the high temperature of 1350 ~ 1750 ℃ consumes a large amount of energy that cannot be compared with the temperature below 1250 ℃, and it consumes almost two to three times more energy than raising the temperature below 1250 ℃. There was a problem with rising cost. In addition, since the filtration is performed using the pores between the particles, there is a limit in the porosity for determining the filtration capacity. In general, the porosity of the ceramic filter having an alumina substrate is generally 33 ± 3% or less when the green body is manufactured and calcined by extrusion molding.

On the other hand, a ceramic filter has been proposed in Japanese Patent Laid-Open No. 7-171321 for reducing the firing temperature to reduce energy consumption during a predetermined process. Japanese Patent Laid-Open No. 7-171321 discloses a method in which a small amount of Y ₂ O ₃ , La ₂ O ₃ , CeO _2, or the like is added to an alumina-based raw material as oxide fine particles of a Group 3A element to lower the firing temperature without lowering the strength. Although the proposed firing temperature is 1730 ℃, the effect of lowering the firing temperature is not so great.

In addition, it is generally described that clay, silica, zirconium oxide, titanium dioxide, glass frit, and the like are used as sintering aids in order to strengthen the bonding between aggregates and reduce the firing temperature. It was difficult to sinter at a temperature below ℃.

In addition, a ceramic filter for producing a filter having a high porosity and a manufacturing method thereof have been proposed in Japanese Patent Laid-Open No. 2005-118657. Japanese Patent Laid-Open No. 2005-118657 is a low soda alumina, ion-exchanged water, ammonium polyacrylate, ammonium lauryl sulfate and ammonium stearate, and gelling agent, which prepares a slurry to foam by introducing air while mixing and stirring an epoxy resin with a stirrer. A slipcasting method was used in which a gelling subsidiary aminobispropylamine was added and gelled while being poured into a mold.

However, although the porosity of the ceramic filter substrate was 60%, it achieved a high porosity, but because it was manufactured by the slip casting method, the secondary pore diameter was 150 μm on average. In addition to not being able to achieve performance, the bending strength of the filter is lowered to about 8 MPa, resulting in a decrease in durability.

In addition, Japanese Patent Laid-Open No. 2003-071751 discloses a ceramic filter which can be used for a long time and can easily remove deposits deposited on the filter by back washing. The ceramic filter of Japanese Patent Laid-Open No. 2003-071751 forms a myriad of honeycomb hollows in the outer circumferential section of the cylindrical ceramic filter in order to overcome the low porosity of the alumina substrate, that is, the low permeability and consequently improve the fluid permeability. The slit-type auxiliary pipe passes through the inner circumferential surface of the honeycomb to the outer circumferential surface, and forms a specific flow path so that the purification fluid passing through the ceramic filter cross section from the inner circumferential surface can easily escape to the outside and connects the specific flow path to the external space. By forming a flow path and connecting the inner and outer surfaces of the ceramic filter to a thickness as thin as possible, to overcome the disadvantages of alumina ceramics with low porosity, that is, low transmittance, to increase the backwash effect as much as possible.

However, the ceramic filter is not a method of increasing the porosity of the alumina ceramic substrate itself, but a method of increasing the porosity of the filter through the physical structure or shape of the ceramic filter. In spite of this increase, low permeation rate is increased compared with the increase in porosity of the pores themselves due to the characteristics of the substrate, and importantly, it is very high pressure extrusion pressure and large equipment to form a myriad honeycomb hollow. Is required, and therefore, extrusion also involves a high energy process, resulting in a cost increase.

The present invention for solving the conventional problems as described above is to manufacture a high-energy manufacturing process due to high temperature firing, which is a disadvantage of the conventional ceramic filter manufacturing process through low energy firing, thereby lowering the manufacturing cost, and mounted on the water treatment apparatus for a long time It is an object to provide a ceramic filter that maintains practical strength that can be used.

In addition, an object of the present invention is to provide a ceramic filter which can not only easily remove the deposit deposited on the filter by back washing, but also has an excellent permeation amount and excellent filtration performance.

The present invention for achieving such an object,

Applying and firing a porous ceramic substrate, a slurry of a mixture of titanium dioxide and porous silicon dioxide on the filtration surface of the porous ceramic substrate, and applying and firing a titanium dioxide sol solution having a nanometer particle diameter to the intermediate filtration membrane It provides a ceramic filter comprising a; upper filter membrane made.

The porous ceramic substrate may be manufactured by molding and firing a mixture obtained by mixing titanium dioxide, clay powder, an organic additive, and water with porous silicon dioxide as a main material, and more preferably 100 parts by weight of titanium dioxide. 1 to 15 parts by weight, 1 to 15 parts by weight of clay powder, 10 to 20 parts by weight of organic additives and 20 to 30 parts by weight of water obtained by mixing and molding the mixture is preferably prepared.

In addition, the porous ceramic substrate preferably has a cylindrical shape or a cylindrical shape in which a plurality of through holes are formed in the axial direction.

The intermediate filtration membrane is formed using a slurry obtained by mixing an inorganic material consisting of titanium dioxide and porous silicon dioxide with water, and the inorganic material is 80 to 99% by weight of the titanium dioxide and 1 to 20% by weight of porous silicon dioxide. It is good to consist of. The slurry is preferably made by mixing 5 to 40% by weight of the inorganic raw material and 60 to 95% by weight of water. In particular, the intermediate filtration membrane is formed by using 1 to 10 parts by weight of one or two or more selected from polyvinyl alcohol, polyacrylamide, polyacrylic resin, and polyester resin to 100 parts by weight of the slurry. desirable.

In addition, the present invention,

a) applying a slurry of a mixture of titanium dioxide and porous silicon dioxide to the filtration surface of the porous ceramic substrate and then firing to form an intermediate filtration membrane;

b) applying a titanium dioxide sol solution having a nanometer particle diameter to the intermediate filtration membrane and calcining to form an upper filtration membrane; providing a method of manufacturing a ceramic filter comprising the.

The porous ceramic substrate may be prepared by molding and firing a mixture obtained by mixing titanium dioxide, clay powder, an organic additive, and water with porous silicon dioxide, and more preferably, 100 parts by weight of titanium dioxide 1 It is preferably prepared by molding and firing the mixture obtained by mixing -15 parts by weight, 1-15 parts by weight of clay powder, 10-20 parts by weight of organic additives and 20-30 parts by weight of water.

In the step a), a slurry obtained by mixing an inorganic raw material consisting of 80 to 99% by weight of titanium dioxide and 1 to 20% by weight of porous silicon dioxide in water is applied to the filter surface of the porous ceramic substrate, and then fired to form an intermediate filter membrane. It is preferable to form 1 to 10 parts by weight of one or two or more selected from polyvinyl alcohol, polyacrylamide, polyacrylic resin, and polyester resin to 100 parts by weight of the slurry of step a).

In particular, in the step a), the slurry is applied to the filter surface of the porous ceramic substrate, and then calcined at 800 to 1000 ° C. in an air atmosphere.

In addition, in step b), after applying a titanium dioxide sol solution having a particle size of 10 to 100 nanometers, it is preferably baked at 600 to 1000 ° C. in an air atmosphere.

Hereinafter, the ceramic filter of the present invention and a manufacturing method thereof will be described in detail.

The ceramic filter of the present invention largely comprises a porous ceramic substrate, an intermediate filtration membrane and an upper filtration membrane.

The porous ceramic substrate is prepared by molding and firing a mixture obtained by mixing titanium dioxide and clay powder, which are sintering aids, and organic additives and water, as a main material, porous silicon dioxide.

In the case of a ceramic substrate of a conventional ceramic filter, alumina is used as a main material, while the present invention uses porous silicon dioxide. In general, the pores of ceramic filters generally obtain filtration due to the size of the pores and the amount of pores, i.e., porosity, resulting from the combination of particles and particles. Therefore, as the firing temperature increases, the pore size decreases. The myriad of pores developed in itself are added with pores between particles, which has the advantage of showing more filtering effect.

Titanium dioxide and clay powders, which are sintering aids, slightly decrease porosity as they are sintered and bonded with porous silicon dioxide when the sintering temperature is reached, while increasing the strength of the substrate. In addition, when applying the slurry mixed with titanium dioxide and porous silicon dioxide to form the intermediate filtration membrane on the surface of the substrate, it is easy to bond with the coating film, so that the bonding strength of the intermediate filtration membrane is excellent, and can withstand the water pressure at a considerable pressure. It works.

Titanium dioxide and clay powder as sintering aids are preferably mixed in an amount of 1 to 15 parts by weight based on 100 parts by weight of porous silicon dioxide. The composition of titanium dioxide and clay powder as a sintering aid for the substrate can be adjusted according to the particle size of the substrate, but if titanium dioxide is mixed in less than 1 part by weight, it will not be possible to increase the additional bonding strength between the substrates at a constant sintering temperature. This is because the binding force between the intermediate filtration membrane and the substrate can no longer be improved, and when mixed to 15 parts by weight or more, the binding force between the substrates and the intermediate filtration membrane and the substrate can be increased, but the shrinkage of the substrate is greatly increased and the porosity is increased. There is a problem falling. In addition, when the clay powder is mixed in less than 1 part by weight, there is a problem in that the bonding strength between the substrates falls below the practical strength, and when mixed in more than 15 weights, the porosity of the substrate is reduced even though the bonding strength of the substrate is increased. Because.

In addition, the organic additive is for improving moldability, and includes one or more selected from a binder, a thickener, and a humectant. The organic additive is preferably 10 to 20 parts by weight based on 100 parts by weight of porous silicon dioxide. When the organic additive is mixed in an amount less than 10 parts by weight, the friction between the inner wall of the extrusion screw and the extruder and the ceramic substrate cannot be reduced, so that the physical properties of the ceramic mixture are changed or an extrusion load is generated. This is because, when mixed with more than a weight part, the molding strength of the green body of the porous ceramic substrate is so low that the shape of the extruded green body is deformed, and thus extrusion molding is impossible.

It is preferable that 20-30 parts by weight of water, which is a solvent, is mixed with respect to 100 parts by weight of porous silicon dioxide. If the content of water is less than 20 parts by weight, the fluidity of the ceramic mixture is lowered and an extrusion load is generated. , When mixed with more than 30 parts by weight, there is a problem that the molding strength of the green body is significantly lowered.

The porous ceramic substrate is obtained by obtaining a ceramic raw material obtained by mixing titanium dioxide and clay particles with porous silicon dioxide, and then mixing the ceramic raw material with a solution containing an organic additive such as a binder, a thickener, a plasticizer, and a humectant in water at least two times. It is knead | mixed uniformly and the clay which is a molding raw material which has extrusion plasticity is produced. Then, the clay is made of green body by vacuum extrusion molding method, dried and calcined at a temperature of 950 ~ 1250 ℃ or less to obtain a porous ceramic substrate. When firing at less than 950 ℃ there is a problem that the durability can not be obtained because the sufficient sintered strength is not obtained, and when firing at a temperature of 1250 ℃ or more there is a problem that the porosity is lowered to 50% or less and the shrinkage is significantly increased.

In particular, the porous silicon dioxide can control the pores by firing, so that the practical strength required for filtration can be achieved at a temperature of 1250 ° C. or less, which is relatively easy to control pore control and relatively easy to control the temperature of the alumina aggregate filter, which is 1350 to 1750 ° C. Branches can obtain a porous ceramic substrate.

At this time, the clay is preferably molded into a cylindrical shape by a vacuum extrusion molding method, or a cylindrical shape in which a plurality of through holes are formed in the axial direction.

Next, the intermediate filtration membrane is formed by applying and firing a filtration slurry on the filtration surface of the porous ceramic substrate.

The intermediate filtration membrane is coated with a slurry made by mixing an inorganic raw material consisting of titanium dioxide and porous silicon dioxide, water, and an organic additive, and calcining it at 800 to 1100 ° C. to complete the intermediate filtration membrane.

 The substrate serves as a support for maintaining the skeleton and the practical strength of the ceramic filter, but the filter layer which separates the fine particles in the liquid, which is the filter medium, and provides direct filtering power is an upper filtration membrane. It is the intermediate filtration membrane layer which forms the intermediate layer of this upper filtration membrane and a base material layer, and this intermediate filtration membrane layer is smaller than a base material, and has a pore size larger than the pore of an upper filtration membrane layer. In addition, since the intermediate filtration membrane layer should be made of a material that can fuse well with the components of the substrate in order to bond the surface layer of the substrate and the upper filtration membrane layer to each other to maintain sufficient bonding strength to withstand high water pressure, The inorganic material included is preferably made of 80 to 99% by weight of titanium dioxide and 1 to 20% by weight of porous silicon dioxide. When the porous silicon dioxide is more than 20% by weight, it is difficult to control the pore size according to the sintering temperature, and it is difficult to obtain an intermediate layer having a uniform porosity, and when it is less than 1% by weight, the bonding strength and durability with the substrate layer are increased. Because it is difficult to do.

The slurry including the inorganic raw material and water is composed of a slurry of the content of the inorganic raw material is 5 to 40% by weight and the water content of 60 to 95% by weight.

In particular, 1 to 10 parts by weight of one or two or more selected from polyvinyl alcohol, polyacrylamide, polyacrylic resin, and polyester resin is preferably mixed with 100 parts by weight of the slurry. When the mixture is less than 1 part by weight, the inorganic materials do not prevent aggregation easily with each other, and thus, it is difficult to form a filtration membrane layer of a certain quality. This is a non-uniform problem.

The slurry is applied to the filtration surface of the porous ceramic substrate to form a membrane, then dried and calcined at 800 to 1100 ° C. to complete the intermediate filtration membrane.

 The filtration membrane slurry is formed on the surface of the substrate or on the surface on which the purified fluid begins to pass to form a filtration membrane, which is dried and then fired at 800 to 1100 ° C. to complete the primary filtration membrane layer. When firing at a temperature below 800 ° C., there is a problem that the durability of the intermediate filtration membrane layer is insufficient due to lack of sintering strength. When firing at a temperature above 1100 ° C., the anatase phase is excessively reduced to 5% or less, resulting in desorption of contaminants. Because.

The filtration membrane is changed from the anatase phase to the rutile crystallization state by sintering, thereby greatly improving the coating film strength of the intermediate filtration membrane, which can withstand the pressure of the water treatment process for advanced treatment for a long time, and greatly improves the service life. have.

The upper filtration membrane is to improve the filtration capacity of the fluid to be purified and to harden the intermediate filtration membrane to prevent the filtration membrane of the intermediate layer from being easily peeled off by the pressure of water treatment. It is made by applying and baking to the intermediate filtration membrane.

In particular, an anatase type titanium dioxide sol solution having a particle size of 10 to 100 nm and having a concentration of 10 to 20% by weight was formed on the surface of the intermediate filtration membrane by dip coating or wash coating, and then dried, followed by drying. Firing at a temperature of ° C completes the upper filtration membrane. In the upper filtration membrane, anatase-type titanium dioxide is changed to 10-90% in a rutile crystal state by firing at a temperature of 600 to 1000 ° C.

Such a ceramic filter is formed of a plurality of layers by sequentially forming an intermediate filtration membrane and an upper filtration membrane smaller than the pore diameter of the porous ceramic substrate, and the purified fluid is filtered through the upper filtration membrane and the intermediate filtration membrane of a smaller pore diameter. Since the filtration of the purified fluid proceeds through the porous ceramic substrate having a larger pore diameter, fouling phenomenon that the filter is clogged due to blockage or closed pores inside can be significantly reduced, which not only prolongs the filter life but also inversely Easy to clean has the advantage that the filter can be used longer.

According to the present invention, a high energy manufacturing process due to high temperature firing, which is a disadvantage of the conventional ceramic filter manufacturing process, is manufactured through low energy firing, thereby lowering the manufacturing cost and maintaining practical strength that can be used in a long-term water treatment device. It works.

In addition, the present invention can significantly reduce the fouling phenomenon in which the filter is clogged due to blockage or closed pores in the inside, and can easily remove the deposit deposited on the filter by back washing, and also has an excellent permeation rate and filtering The performance is excellent.

1 is a photograph taken with an electron microscope of the surface of the ceramic filter of Example 1,
2 is a photograph taken with an electron microscope of a cross section of the ceramic filter of Example 1. FIG.
3 is a view showing the results of the microfiltration test for the ceramic filter of Example 1,
4 is a view showing the results of the microfiltration test for the ceramic filter of Example 2,
5 is a view showing a microfiltration test result for the ceramic filter of Comparative Example 1.
6 is a view schematically showing a continuous simple water treatment apparatus,
7 and 8 are diagrams showing the change in water permeation amount and cumulative water permeability of the ceramic filter of Example 3 according to the operation of the continuous simple water treatment apparatus.

Hereinafter, the present invention will be described in more detail with reference to Examples. The scope of the present invention is not limited to the following Examples.

Example 1

10 parts by weight of titanium dioxide having an average particle diameter of 0.3 μm, 10 parts by weight of clay powder having an average particle diameter of 6.7 μm, and 3 parts by weight of methyl cellulose as a powder thickener, 3 parts by weight of a powder mixer v mixer It was mixed for 4 hours to obtain a ceramic raw material.

A mixture of 25 parts by weight of water and 8 parts by weight of glycerin as a plasticizer and 8 parts by weight of polyethylene glycol as a wetting agent and 100 parts by weight of the mixed ceramic raw material was kneaded two or more times in a state in which the ceramic raw material was added together with the ceramic raw material. A clay for extrusion was made. The clay for extrusion molding was molded in a cylindrical ceramic green body using a vacuum extruder. After drying the ceramic green body in a drying furnace of 80 ℃ for more than 12 hours and calcined for 2 hours at a temperature of 1140 ℃ and cut at intervals of 185mm to prepare a porous ceramic substrate. The porous ceramic substrate had a diameter of 40 mm and a thickness of 9 mm. The porosity of this porous ceramic substrate was 50 ~ 60%, flexural strength was 150kgf / cm ² , compressive strength was 621kg / cm ² , and average pore diameter was 20㎛.

A slurry was obtained by mixing an inorganic raw material in which a powder of titanium dioxide fine particles having an average particle diameter of 0.3 μm and a porous silicon dioxide (M) having an average particle size of 10 μm in a ratio of 95: 5 and water in a ratio of 30:70. Then, 6 parts by weight of the polyester resin was added to 100 parts by weight of the slurry to prepare a final slurry for forming the intermediate filtration membrane.

After the through-hole of the porous ceramic substrate was sealed with a plastic cap, the slurry was supported on the slurry to form a coating film, and then dried at 80 ° C. for at least 12 hours. Thereafter, the seal was removed and calcined at 1000 ° C. for 2 hours to prepare a ceramic filter in which an intermediate filtration membrane was formed.

The photograph of the surface of the ceramic filter of Example 1 taken with an electron microscope is shown in FIG. 1, and the photograph of the cross section of the ceramic filter is shown in FIG. 2.

[Example 2]

Unlike Example 1, the ceramic substrate was calcined at 1180 ° C. for 2 hours to prepare a porous ceramic filter, and then the intermediate filter membrane was formed in the same manner as in Example 1 to prepare the ceramic filter of Example 2.

[Example 3]

The ceramic filter prepared in the same manner as in Example 1 was supported on an anatase-type titanium dioxide sol solution (ST-150W) manufactured by E Company to form a coating film on the surface of the intermediate filtration membrane, and then dried at 80 ° C. for at least 12 hours, and then subjected to drying. Baking at 2 ° C. for 2 hours to prepare a ceramic filter having an upper filtration membrane.

Comparative Example 1

In Example 1, a porous ceramic substrate having no intermediate filtration membrane was used as the ceramic filter of Comparative Example 1.

[Precision filtration test]

One end of the ceramic filter of Examples 1, 2, 3 and Comparative Example 1 was sealed with a plastic cap, and the other end was sealed with a perforated plastic cap so that the filtered water was discharged, and then KS was made. The water quality test was carried out by installing in a precision filtration test apparatus according to M9242. The raw water of the test was a precision filtration test using the river water of Samryecheon, Wanju-gun, Jeonbuk. The microfiltration test results of the ceramic filters of Examples 1 and 2 and Comparative Example 1 are shown in FIGS. 3 to 5, respectively.

In the case of Comparative Example 1, as shown in FIG. 5, the differential pressure gradually increases during the purification, and the differential pressure continues to rise even after the filter is backwashed. This means that as the contaminant enters the filter during the purification process, which blocks the pores of the filter and increases the contamination, the filter is easily contaminated and the water purification capacity is degraded. On the other hand, in the case of Examples 1 and 3, a constant differential pressure is maintained even after water purification or backwashing as shown in FIGS. 3 and 4, and even after long-term water treatment, the filter is not easily blocked, so that constant backwashing is used even for long-term use. It can be seen that contaminants can be easily removed and water treatment proceeds.

[Coliform Group Test]

The coliform groups before and after the filtration test for the ceramic filters of Examples 1 to 3 and Comparative Example 1 were analyzed, and the results are shown in Table 1. Coliform group was measured using water pollution pollution process test method.

Coliform Analysis enemy Example 1 Example 2 Example 3 Comparative Example 1 Coliform group (dog / ml) 105 0 0 0 17.5

In the case of Comparative Example 1 E. coli group was detected 17.5 / ml, but in Examples 1 to 3 was not detected E. coli group.

[Particle count analysis]

The particle size present before and after the filtration test for the ceramic filters of Examples 1 to 3 and Comparative Example 1 was analyzed, and the particle count was used for Particle Counter (Chemtrac, U.S.A).

Result of particle count analysis
Particle size (㎛) 10-20 20-30 30 to 40 40-50 50-60 60-70 70-80 80-100 enemy 88 8 2 One 0 0 0 0 Example 1 0 0 0 0 0 0 0 0 Example 2 0 0 0 0 0 0 0 0 Example 3 0 0 0 0 0 0 0 0 Comparative Example 1 6 0 0 0 0 0 0 0

In Examples 1 to 3, all particles having a size of 10 μm or more were filtered and not detected at all after the filtration test. In Comparative Example 1, 6 particles having a size of 10 to 20 μm were detected.

[Continuous Water Treatment Treatment Performance Test]

The ceramic filter of Example 3 was attached to the continuous simple water treatment apparatus as shown in FIG. 6 to test the continuous water treatment operation performance. 7 and 8 show changes in the permeation rate and the cumulative permeation rate according to the operation of the system.

As shown in FIG. 7, after about 1 hour, the water permeation rate of about 450L was decreased, and after about 3 hours, the water permeation amount was decreased to about 360L, but after 8 hours, the water permeation rate of about 350L was maintained.

Claims (16)

And a middle filtration membrane formed by applying and firing a porous ceramic substrate, and a slurry in which titanium dioxide and porous silicon dioxide are mixed on the filtration surface of the porous ceramic substrate.
The method of claim 1,
And an upper filtration membrane formed by applying and firing a titanium dioxide sol solution having a nanometer particle diameter to the intermediate filtration membrane.
The method according to claim 1 or 2,
The porous ceramic substrate,
Ceramic filter, characterized in that produced by molding and firing the mixture obtained by mixing titanium dioxide, clay powder, organic additives and water as a main porous silicon dioxide.
The method of claim 3,
The porous ceramic substrate,
It is produced by molding and firing the mixture obtained by mixing 1 to 15 parts by weight of titanium dioxide, 1 to 15 parts by weight of clay powder, 10 to 20 parts by weight of organic additives and 20 to 30 parts by weight of water to porous silicon dioxide. Ceramic filter.
The method according to claim 1 or 2,
The porous ceramic substrate is a ceramic filter, characterized in that formed in a cylindrical shape.
The method according to claim 1 or 2,
The porous ceramic substrate is a ceramic filter, characterized in that the cylindrical shape formed with a plurality of through holes in the axial direction.
The method according to claim 1 or 2,
The intermediate filtration membrane is formed using a slurry obtained by mixing 5 to 40 wt% of an inorganic material consisting of titanium dioxide and porous silicon dioxide and 60 to 95 wt% of water, and the inorganic material is 80 to 99 wt% of the titanium dioxide. Ceramic filter, characterized in that consisting of 1 to 20% by weight of porous silicon dioxide.
The method of claim 7, wherein
The intermediate filtration membrane is formed by mixing 1 to 10 parts by weight of one or two or more selected from polyvinyl alcohol, polyacrylamide, polyacrylic resin, and polyester resin to 100 parts by weight of the slurry. Ceramic filter
A method of producing a ceramic filter, comprising the step of applying an slurry of a mixture of titanium dioxide and porous silicon dioxide to a filtration surface of a porous ceramic substrate, followed by baking to form an intermediate filtration membrane.
10. The method of claim 9,
And applying a titanium dioxide sol solution having a nanometer particle diameter to the intermediate filtration membrane, followed by sintering to form an upper filtration membrane.
11. The method according to claim 9 or 10,
The porous ceramic substrate is manufactured by molding and firing a mixture obtained by mixing titanium dioxide, clay powder, an organic additive and water into porous silicon dioxide, which is the main ceramic filter.
11. The method according to claim 9 or 10,
The porous ceramic substrate is molded and fired a mixture obtained by mixing 100 parts by weight of porous silicon dioxide to 1 to 15 parts by weight of titanium dioxide, 1 to 15 parts by weight of clay powder, 10 to 20 parts by weight of organic additives and 20 to 30 parts by weight of water. Method for producing a ceramic filter, characterized in that manufactured by.
11. The method according to claim 9 or 10,
A slurry obtained by mixing an inorganic raw material consisting of 80 to 99% by weight of titanium dioxide and 1 to 20% by weight of porous silicon dioxide in water is applied to the filter surface of the porous ceramic substrate, and then fired to form an intermediate filter membrane. Method for producing a ceramic filter.
The method of claim 13,
Method for producing a ceramic filter, characterized in that 1 to 10 parts by weight of one or two or more selected from polyvinyl alcohol, polyacrylamide, polyacrylic resin, polyester resin to 100 parts by weight of the slurry is mixed.
The method of claim 13,
The slurry is applied to the filter surface of the porous ceramic substrate and then fired at 800 to 1000 ° C. in an air atmosphere.
The method of claim 10,
A method for producing a ceramic filter, characterized in that after firing a titanium dioxide sol solution having a particle size of 10 ~ 100 nanometers and firing at 600 ~ 1000 ℃ in the air atmosphere.

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