KR102517386B1 - Apparatus and method to manufactue ceramic filter having ultra-fine filtration layer - Google Patents

Abstract

A method for manufacturing a ceramic filter having an ultra-fine filtration layer according to an embodiment of the present invention includes manufacturing a ceramic support by combining a ceramic slurry with a support using a ceramic support manufacturing apparatus, and manufacturing the ceramic support as an auxiliary material. It may include a coating step of coating the microfiltration layer of.

Description

Apparatus and method for manufacturing a ceramic filter having an ultra-fine filtration layer

The present invention relates to an apparatus and method for manufacturing a ceramic filter having an ultra-precision filtration layer, and more particularly, dust collection efficiency can be adjusted by adjusting the pore size of a micro-filtration layer deposited on a ceramic filter, and small particles The present invention relates to an apparatus and method for manufacturing a ceramic filter having an ultra-fine filtration layer capable of extending the life of the ceramic filter by first filtering what penetrates into the filter through the microfiltration layer and easily separating particulate matter accumulated on the surface of the filter. .

As the emission regulation for particulate pollutants has changed from particle weight standards to regulations that classify particle size, the technology of high-efficiency devices that simultaneously reduce harmful gases and particulate matter, which are precursors of fine dust, is attracting attention. As the demand for filtration increases, ceramic filters, which are ultra-precision filtration materials, are attracting attention.

Due to the thermal, chemical, and mechanical stability unique to ceramic filters, chemical cleaning using strong acid and strong alkali solutions is easy, and high-temperature and high-pressure cleaning is possible. Since the durability of the material itself is excellent, it is possible to prevent contamination by microbes and bacteria and the decomposition of the filter, which is advantageous for cost reduction because it is possible to operate for a long time.

In the prior art among ceramic filter manufacturing methods, a carrier of sponge or fiber is impregnated with a slurry of a mixture of raw materials such as ceramic powder, inorganic/organic binder, pore-forming agent, water or alcohol, and then molded and dried using a mold and sintering to prepare porous ceramic filters of various specifications.

Porous ceramics simultaneously have the unique properties of porous materials such as separation/collecting (open pore structure) and thermal insulation (closed pore structure), which conventional dense materials do not have, and high thermal and chemical stability of ceramics. Porous ceramics have high porosity, low density, and a wide specific surface area, so they are used in various fields such as exhaust gas purification filters and water treatment filters in addition to household items such as heat insulating materials, sound absorbing materials, and absorbers.

Methods for producing porous ceramics may be classified into a partial sintering method, a sacrificial template method, a direct foaming method, and a replica template method.

Among them, the replication template method is a method of impregnating polymer fibers of a nonwoven fabric with a ceramic slurry and then removing the polymer fibers through a heat treatment process. The porous ceramic support manufactured by this process is characterized by a three-dimensional network structure with high porosity and transmittance at the same time, but the stress is concentrated in the empty space where the polymer fiber is thermally decomposed during the sintering process, resulting in low overall mechanical strength and local cracking. This easily occurs problem occurs, and it is known that it is not easy to maintain the final shape due to shrinkage during the sintering process.

In order to overcome this problem, a method of increasing strength through a winding method in which fibers impregnated with ceramic slurry are wound around a mold and sintered is proposed.

On the other hand, according to the method of manufacturing a porous ceramic filter, a ceramic raw material is applied to a fiber, and a support is formed by winding it several times using a pipe or similar mold, and a sintering process is performed at a temperature of 150 to 450 ° C. and 900 to 1300 ° C. Through this, the fibrous support structure disappeared, and a porous structure having fine spaces was formed through binder binding between ceramic particles.

Meanwhile, according to another related prior art, there is a technique in which a coating process for forming finer pores is added to the manufactured ceramic tube.

In the prior art described above, the process of mixing raw materials such as ceramic powder and auxiliary materials constituting the raw materials, such as binder and water, is very complicated, and the specific gravity of ceramic is very high, so the mixer is used for a long time during the process of transferring the raw materials to the coating process at a constant concentration. There may be some inconveniences that need to be operated.

In addition, in the process of applying the raw material to the fiber, as relatively low-viscosity water or alcohol flows down or rapidly evaporates, it is difficult to apply it with a constant and uniform thickness, and immersion so that the liquid ceramic slurry can settle on the support In the process of repeating and squeezing or applying, the fiber support may be torn or wrinkles peculiar to the fiber may be formed on the surface of the filter support after sintering.

In the sintering process, a large amount of electric energy is required because the equipment is used for a certain period of time and at a high temperature of 1000 ° C or higher. In addition, irregular large (Big) besides micropores cannot be bonded between non-uniformly coated ceramic raw material particles with a binder. Pores may be formed, which may cause the strength of the filter support to be weakened after sintering.

In addition, if irregular large pores exist in a recessed form on the surface of the product, the fine particulate matter to be filtered is accumulated and the filter life is shortened because the material to be filtered is not easily separated even through the dedusting regeneration process using backwash air. It can cause thermal shock damage to the ceramic support due to the local temperature rise of the fine particles accumulated during the high-temperature process operation, and it can be an obstacle to the coating process to secure fine pores when they protrude on the surface. .

On the other hand, among many natural materials, diatomaceous earth is a natural mineral material produced by the fossilization of diatoms having various shapes. It has many internal pores, irregular particle shapes, abundant reserves, and other porous ceramics such as silicon carbide, silicon nitride, alumina, and zirconia. It is cheaper than other materials and can significantly reduce manufacturing costs because it is a silica-based material and has a low sintering temperature.

Pores of diatomaceous earth itself can act as a great advantage in that the air permeability of the coating layer is maintained without completely removing the pores in the heat treatment process after depositing the coating layer on the ceramic support. These characteristics of diatomaceous earth are suitable for depositing a ceramic filter coating layer for purification of exhaust gas complex contaminants requiring fine pores of 1 μm or more.

In an embodiment of the present invention, the dust collection efficiency can be adjusted by adjusting the pore size of the microfiltration layer deposited on the ceramic filter, and the microfiltration layer first filters out small particles from penetrating into the filter, and the microfiltration layer accumulates on the filter surface. Provided is an apparatus and method for manufacturing a ceramic filter having an ultra-precision filtration layer capable of extending the life of the ceramic filter since particulate matter can be easily separated.

The problem to be solved by the present invention is not limited to the above-mentioned problem (s), and another problem (s) not mentioned will be clearly understood by those skilled in the art from the following description.

A method for manufacturing a ceramic filter having an ultra-fine filtration layer according to an embodiment of the present invention includes manufacturing a ceramic support by combining a ceramic slurry with a support using a ceramic support manufacturing apparatus, and manufacturing the ceramic support as an auxiliary material. It may include a coating step of coating the microfiltration layer of. In addition, the step of manufacturing the ceramic support according to an embodiment of the present invention may include a step of preparing a ceramic slurry after weighing the raw material of the ceramic support, and then combining the ceramic slurry to the support, and using a molding device. A molding step of molding the ceramic support body into a mold shape of the molding device and a first drying and sintering step of first drying and sintering the ceramic support body after molding using a drying and sintering device may be included.

In addition, the manufacturing method according to the embodiment of the present invention may further include a secondary drying and sintering step of secondarily drying and sintering the cerami support coated through the coating step using a drying and sintering device.

In addition, the average pore size of the ceramic filter subjected to the secondary drying and sintering step according to an embodiment of the present invention may be 2.5 μm or less, and the average porosity may be 40 to 50%.

In addition, in the step of combining the carrier according to an embodiment of the present invention, the ceramic slurry may be applied to the carrier using a tape casting method.

In addition, the carrier according to an embodiment of the present invention may be paper, corrugated cardboard or tape.

In addition, the ceramic slurry according to an embodiment of the present invention includes 60 to 70 parts by weight of alumina, hydrocarbon or diatomaceous earth as a ceramic raw material, and 30 to 40 parts by weight of sodium silicate, potassium silicate or inorganic binder IB-A10 as a liquid inorganic binder. parts by weight may be included.

In addition, the ceramic slurry according to an embodiment of the present invention includes 2 to 5 parts by weight of wood powder or activated carbon as a pore-forming agent and 3 to 10 parts by weight of an interface as a foaming agent, based on 100 parts by weight of the mixture of the ceramic raw material and the inorganic binder. Active agents may be included.

In addition, the ceramic slurry according to an embodiment of the present invention includes 66 parts by weight of alumina, hydrocarbon or diatomaceous earth as a ceramic raw material, and 34 parts by weight of sodium silicate, potassium silicate or inorganic binder IB-A10 as a liquid inorganic binder, , 3 parts by weight of wood powder or activated carbon based on 100 parts by weight of the mixture of the ceramic raw material and the inorganic binder may be included as a pore-forming agent, and 5 parts by weight of a surfactant may be included as a foaming agent.

In addition, in the coating step according to an embodiment of the present invention, the coating slurry may be prepared by mixing the organic binder and the inorganic binder for 36 hours or more.

In addition, in the coating step according to an embodiment of the present invention, a dip-coating method and a spray coating method may be used to deposit a coating layer as the auxiliary material on the ceramic support.

In addition, in the coating step according to an embodiment of the present invention, the dip coating method may be used once for 1 second to 60 seconds, and the spray coating method may be used 2 to 5 times.

In addition, during the coating step according to an embodiment of the present invention, the coating layer may be coated to a thickness of 100 to 200 μm by the dip coating method and the spray coating method.

In addition, during the primary dry sintering step and the secondary dry sintering step according to an embodiment of the present invention, the molded ceramic support may be dried and sintered at 150 to 450 °C or 900 to 1300 °C.

In addition, in the first dry sintering step and the second dry sintering step according to an embodiment of the present invention, after drying the ceramic support, the ceramic support is heated in an air atmosphere to a temperature of 250 ° C for 1 hour and up to 450 ° C for sintering. It can be cooled naturally for 4 hours, up to 900℃ for 5 hours, and from 900℃ for 3 hours.

On the other hand, a ceramic filter manufacturing apparatus according to an embodiment of the present invention includes a ceramic support manufacturing unit for manufacturing a ceramic support by combining a ceramic slurry with a support, a coating unit for coating an auxiliary material on the ceramic support, and the ceramic support It may include a molding unit for molding by placing it in a mold, and a dry sintering unit for drying and sintering the molded ceramic support.

In addition, the ceramic support according to an embodiment of the present invention bonds the ceramic slurry to the support using a tape casting method, and the support may be paper, corrugated cardboard, or tape.

In addition, the ceramic slurry according to an embodiment of the present invention includes 60 to 70 parts by weight of alumina, hydrocarbon or diatomaceous earth as a ceramic raw material, and 30 to 40 parts by weight of sodium silicate, potassium silicate or inorganic binder IB-A10 as a liquid inorganic binder. parts by weight, compared to 100 parts by weight of the mixture of the ceramic raw material and the inorganic binder as a pore-forming agent 2 to 5 parts by weight of wood powder or activated carbon may be included, and 3 to 10 parts by weight of a surfactant as a foaming agent may be included.

In addition, in order to deposit a coating layer on the ceramic support as the auxiliary material according to an embodiment of the present invention, a dip-coating method and a spray coating method may be used by the coating unit.

In addition, the dry sintering unit according to an embodiment of the present invention may dry and sinter the molded ceramic support at 150 to 450 °C or 900 to 1300 °C.

According to an embodiment of the present invention, not only can the dust collection efficiency be controlled by adjusting the pore size of the microfiltration layer deposited on the ceramic filter, but the microfiltration layer first filters small particles from penetrating into the filter, and then the filter surface Accumulated particulate matter can be easily separated, prolonging the life of the ceramic filter.

In addition, the ceramic microfiltration layer using diatomaceous earth is based on low-cost natural materials with abundant reserves worldwide, so it is possible to avoid the production cost problem that occurs when using expensive ceramic raw materials.

In addition, diatomaceous earth has an irregular particle shape, so when a microfiltration layer is formed, it has a maximized specific surface area, which is additionally advantageous for coating catalyst particles for catalytic reactions, and sintering at low temperatures is possible, resulting in a high-temperature sintering process The production cost problem caused by can also be solved.

By using a liquid inorganic binder, it is possible to maintain a constant viscosity for a long time compared to water and alcohol, so it is easy to apply the slurry to the carrier.

In addition, by using a foaming agent, the drying time is more than twice as fast, so the production speed can be increased.

1 is a flow chart of a method of manufacturing a ceramic filter having an ultrafine filtration layer according to an embodiment of the present invention.
FIG. 2 is a view for explaining a step of manufacturing a ceramic support in the manufacturing method of FIG. 1 .
FIG. 3 is a view showing a device and method for thinly applying a slurry on a base tape and bonding it to a carrier.
FIG. 4 is an image view showing a coating layer of the ceramic filter manufactured in FIG. 1 .
5 is an image diagram of a filter provided with an alumina coating layer in which pores are lost.
6 is a graph showing the flow according to the pressure of the ceramic filter manufactured by the manufacturing method of FIG. 1 .
7 is a view showing a case where slip casting is applied to a ceramic filter according to another embodiment of the present invention.

Advantages and/or features of the present invention, and methods of achieving them, will become apparent with reference to the following detailed description of the embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various forms different from each other, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flow chart of a method of manufacturing a ceramic filter having an ultra-fine filtration layer according to an embodiment of the present invention, FIG. 2 is a view for explaining a ceramic support manufacturing step of the manufacturing method of FIG. 1, and FIG. 3 is a background It is a diagram showing an apparatus and method for applying a slurry thinly on a tape and bonding it to a carrier, and FIG. 4 is an image diagram showing the coating layer of the ceramic filter manufactured by FIG. 1, and FIG. 5 is provided with an alumina coating layer having lost pores 6 is a graph showing the flow according to the pressure of the ceramic filter manufactured by the manufacturing method of FIG. 1.

Referring to FIG. 1 , a method of manufacturing a ceramic filter having an ultra-fine filtration layer according to an embodiment of the present invention includes a ceramic support manufacturing step (S100) of manufacturing a ceramic support, and a micro-filtration layer of the ceramic support as an auxiliary material. A coating step (S200) of coating may be included.

Through these steps, a ceramic filter having an ultrafine filtration layer can be manufactured. In other words, the dust collection efficiency can be adjusted by adjusting the pore size of the microfiltration layer deposited on the manufactured ceramic filter, and the microfiltration layer primarily filters out small particles from penetrating into the filter, and the accumulated particles on the filter surface Since the material can be easily separated, it can greatly contribute to extending the life of the ceramic filter.

Each step will be described. First, in the ceramic support manufacturing step (S100) of this embodiment, as shown in FIGS. 1 to 3, the ceramic slurry 120 is prepared after measuring the raw material of the ceramic support, and then the ceramic slurry A support member bonding step (S110) of coupling the 120 to the support member 110, a molding step (S120) of molding the ceramic support 100 into the frame shape of the molding device using a molding device, and the molded ceramic A primary drying and sintering step (S130) of firstly drying and sintering the support 100 using a drying and sintering apparatus may be included.

First, as shown in FIGS. 2 and 3 , in the carrier bonding bonding step (S110) of the present embodiment, the ceramic slurry 120 is applied to the carrier 110 using a ceramic support manufacturing apparatus (1, see FIG. 3) By combining, the ceramic support 100 may be manufactured.

During the bonding of the carrier (S110), the ceramic slurry 120 may be applied to the carrier 110 using a tape casting method.

In the ceramic filter manufacturing method according to an embodiment of the present invention, a liquid inorganic binder having a high viscosity is selected as a raw material and a foaming agent is added to maintain a constant concentration compared to water and alcohol, thereby transporting the raw material and maintaining a constant thickness. It is easy to apply to (110).

The carrier 110 impregnated with the raw material is not limited to fiber, but paper or corrugated cardboard or tape having a smooth surface is used, and, for example, as shown in FIG. When applied, it can be applied evenly and uniformly, and defects in which the ceramic support 100 is torn can be eliminated.

Referring to FIGS. 2 and 3, in the step of combining the carrier (S110) of the present embodiment, the liquid slurry 120 is directly applied to the carrier 110 using a tape casting method, or the base tape ( It may be bonded to the carrier 110 by thinly applying it on a stainless steel tape, an oil paper tape, or a polymer tape.

The carrier 110 coated with the liquid slurry 120 discharges the liquid material by the primary and secondary compression rollers and repeats the process of overlapping the rod-shaped internal mold several times, for example, a tube-shaped ceramic The support (support layer) can be molded.

In this way, the raw material slurry 120 is evenly and uniformly applied to the concave and concave sections of the corrugated cardboard 110 on which certain irregularities are formed, or the liquid slurry 120 is first applied to the film and then wound around a roller to form a carrier such as paper / corrugated cardboard / fiber The production speed can be improved by the tape casting method applied to (110).

In other words, as shown in Table 1, the ceramic slurry 120 of this embodiment contains 60 to 70 parts by weight of alumina, hydrocarbon, or diatomaceous earth as a ceramic raw material, and sodium silicate, potassium silicate, or inorganic binder as a liquid inorganic binder 30 to 40 parts by weight of IB-A10 may be included.

In addition, the ceramic slurry 120 includes 2 to 5 parts by weight of wood powder or activated carbon based on 100 parts by weight of the mixture of the ceramic raw material and the inorganic binder as a pore-forming agent, and 3 to 10 parts by weight of a surfactant (Expancel 920 DU) as a foaming agent -20) may be included.

More specifically, the ceramic slurry 120 contains 66 parts by weight of alumina, hydrocarbon or diatomaceous earth as a ceramic raw material, and 33 to 34 parts by weight of sodium silicate, potassium silicate or inorganic binder IB-A10 as a liquid inorganic binder. 3 parts by weight of wood powder or activated carbon as a pore-forming agent, and 5 parts by weight of a surfactant as a foaming agent.

Specifically, the liquid inorganic binder may be made of sodium silicate or potassium silicate or inorganic binder IB-A10. As the inorganic binder, inorganic binder PS-C200 for fireproof coating may be used, and the fireproof coating exposed to a temperature of 1000° C. or higher includes an inorganic binder and a fireproof filter.

Alternatively, as an inorganic binder, inorganic binder IB-A33 for molding may be used, and as a main use, it may be applied to molding of expanded vermiculite or pearlite. Can be used with curing aid ECO-H.

At this time, after uniformly mixing the curing agent ECO-H with the powder or granular material to be molded, an inorganic binder is added and mixed. As the curing aid, 10 parts by weight of the binder may be used.

Alternatively, as an inorganic binder, inorganic binder IB-A10 for molding may be used, and it may be applied to molding of foamed vermiculite or pearlite, molding of high-density board, and molding of parts requiring fire resistance. Can be used with curing aid ECO-H.

In other words, in the case of soluble silicate, the heat resistance is 700-800 ° C., but it does not decompose at a temperature higher than that, but melts due to heat. Therefore, in order to exhibit high heat resistance of 1000° C. or more, ceramic powder should be applied together with soluble silicate.

As such, since the liquid inorganic binder can be used to maintain a constant viscosity for a long time compared to water and alcohol, it is easy to apply the slurry to the carrier, and the drying time is more than twice as fast by using a foaming agent, so the production speed can be increased.

Meanwhile, although not shown, the molding step (S120) of the present embodiment is a step of molding the ceramic support 100 using a molding device (not shown) having a molding frame, for example, a tube tube. A ceramic support of the shape can be molded.

On the other hand, in the primary drying and sintering step (S130) of this embodiment, the ceramic support 100 molded using a drying and sintering device (not shown) is heated to 150 to 450 ° C. or 900 to 1300 ° C., more specifically, 259 to 1300 ° C. This is a step of drying and sintering at 900 ° C. In sintering, a support of fiber, paper, or corrugated cardboard material is burned at 259 to 900° C., and a support layer may be formed through a binder bonding process.

In other words, in this first dry sintering step (S400), after drying the ceramic support, for sintering of the ceramic support, in an air atmosphere, 1 hour to a temperature of 250 ° C, 4 hours to 450 ° C, 5 hours to 900 ° C, 900 ° C It can be cooled naturally for 3 hours. In this way, by providing a sufficient temperature rise time during the dry sintering step, it is possible to prevent cracking caused by shrinkage of the coating layer.

In other words, a lot of electrical (thermal) energy is required when sintering at a high temperature (900 to 1300 ° C), but in the case of this embodiment, production costs can be reduced because it is manufactured at a low temperature (250 to 900 ° C).

As such, the ceramic filter manufactured by the above steps has an ultra-precision filtration layer, and the average pore size of the ceramic filter subjected to the dry sintering step (S400) is 2.5 μm or less, and the average porosity may be 40 to 50%. .

More specifically, as a result of observing changes in pore characteristics using mercury porosimetry, the average pore size of the ceramic filter was 2.02 μm and the average porosity was 44.31%.

On the other hand, the coating step (S200) of the present embodiment is a step of coating an auxiliary material on the microfiltration layer of the molded ceramic support 100 using a coating device (not shown), for example, an organic binder and an inorganic binder. It is possible to prepare a coating slurry as an auxiliary material by mixing for more than an hour. Since the coating slurry has a high viscosity, it can be evenly applied to the carrier as an organic material.

This coating slurry was composed of 5 g of polyvinyl alcohol (PVA) as an organic binder, 0.5 g of methyl cellulose (MC) as an organic binder, 3.25 g (13 wt.%) of frit as an inorganic binder, and It can be prepared by mixing 5-10ml of Ludox, 0.01-1g of Dolapix CE 64, 100ml of DI-water, and 25g of Diatomite.

In the coating step (S200) of the present embodiment, a dip-coating method and a spray coating method may be used to deposit a coating layer with the above-described coating slurry on the ceramic support 100.

In other words, the coating slurry can be evenly applied to the ceramic support 100 by performing the dip coating method once for 1 second to 60 seconds and the spray coating method 2 to 5 times. At this time, 5 to 10 ml of glycerol may be additionally used to adjust the viscosity of the coating slurry, and through this, as shown in the image of FIG. 4, the coating layer can be stably deposited at 100 to 200 μm by the dip coating method and the spray coating method. there is.

As such, by using a high-viscosity auxiliary material, the mixing ratio of raw materials is constant, and the use of the SLIP CASTING method, which is made by pouring into a mold, can be manufactured in various shapes and the quality of the product surface can be improved.

In addition, when paper with a smooth surface is used, the viscosity of the slurry is high, so it can be applied evenly and smoothly like applying glue to wallpaper, and the speed of the application process can be improved and wrinkles of the fiber carrier that occur when the liquid material is squeezed out can be prevented. can

Meanwhile, as shown in FIG. 1 , the secondary drying and sintering step (S300) may be performed again on the ceramic support on which the microfiltration layer has been coated by the coating step (S200). Since the secondary dry sintering step (S300) substantially corresponds to the aforementioned primary dry sintering step, a description thereof will be omitted.

In this way, not only can the dust collection efficiency be controlled by adjusting the pore size of the microfiltration layer deposited on the ceramic filter, but the microfiltration layer first filters out small particles from penetrating into the filter, and particulate matter accumulated on the filter surface is removed. It can be easily separated, so the life of the ceramic filter can be extended.

In addition, the ceramic microfiltration layer using diatomaceous earth is based on low-cost natural materials with abundant reserves worldwide, so it is possible to avoid the production cost problem that occurs when using expensive ceramic raw materials.

In addition, diatomaceous earth has an irregular particle shape, so when a microfiltration layer is formed, it has a maximized specific surface area, which is additionally advantageous for coating catalyst particles for catalytic reactions, and sintering at low temperatures is possible, resulting in a high-temperature sintering process The production cost problem caused by can also be solved.

Meanwhile, hereinafter, experimental results according to the ceramic filter manufacturing method according to the present embodiment will be described using tables.

In order to find the optimal conditions for depositing the diatomaceous earth coating layer, the composition of the large diatomaceous earth slurry was controlled four times. As described in Table 2, in the first attempt, the amount of organic binder (PVA) was adjusted, but peeling occurred in the coating layer, and in the second attempt, the amount of inorganic binder (Ludox) was adjusted, but a problem was encountered that it was not evenly seated.

In the third attempt, a coating layer was formed by adjusting the amount of glycerol, but the thickness of the coating layer was not constant, and in the fourth attempt, a coating layer with an appropriate thickness was obtained by adjusting the amount of methyl cellulose (M.C, Methyl cellulose) and Dolapix input. . That is, the best coating layer can be formed when it has a composition of the 4th attempt.

Meanwhile, in order to compare and analyze the characteristics of the diatomaceous earth coating layer with the existing alumina coating layer, as shown in Table 3 above, an experiment of depositing an alumina coating layer on a ceramic filter support was performed three times. The high-purity alumina used in the experiment contained 5 g of PVA, 100 ml of DI-water, 0.26 g (13 wt.%) of Frit, and 0.5 g of methyl cellulose (M.C, 400 cp) other than AKP-30 having a sub-micrometer size among commercial powders. A coating slurry was formulated using 1.5 g.

As for the coating conditions, the dip coating method was conducted by keeping the same at 20 mm/s lowering, 1 mm/s higher, and holding time 60 seconds. The first was to change the AKP-30 to 6.25g to 44g, and the second attempt was to adjust the coating holding time to 10 to 60 seconds, so the coating layer was hardly formed.

In the third attempt, the amount of methyl cellulose was changed from 0.5 g to 1.5 g and the other variables were kept the same to form a coating layer. You can confirm that you lost it. This can be confirmed through the image of FIG. 5 .

As a result of the experiment, due to the characteristics of the dip coating process in actual mass production, the dip coating time of the top and bottom of the ceramic filter is inevitably different. , it can be confirmed that the dip coating process margin was secured.

In addition, as the dip coating time of the diatomaceous earth coating layer increased from 1 second to 60 seconds, the pore size did not change, but the decrease in air permeability increased. That is, it can be confirmed that the thickness of the diatomaceous earth coating layer changes as the dip coating time increases.

Therefore, in actual application, since the thickness of the coating layer is directly related to the stable use period of the product, it is possible to reflect it in the design of the product using the trade-off relationship between the life cycle and the flow rate.

In other words, as shown in the graph of FIG. 6, it can be seen that the ceramic filter equipped with the diatomaceous earth coating layer has a better pressure flow than the filter having the alumina coating layer deposited, and therefore, the dust is collected by adjusting the pore size of the microfiltration layer. Not only can the efficiency be controlled, but the pressure loss can be low because the particles are first filtered through the microfiltration layer.

Hereinafter, other embodiments of the present invention will be described with reference to the drawings.

7 is a view showing a case where slip casting is applied to a ceramic filter according to another embodiment of the present invention.

According to another embodiment, the slurry in which the liquid inorganic binder and the foaming agent are mixed with the ceramic raw material can reduce the drying time while maintaining a constant viscosity for a long time, so a slip casting method of injecting the slurry into a mold may be applied. .

As shown in FIG. 7 , the deformed molded article may be a hollow bent flat tubular tube 200 .

Conventional technology is mounted in a horizontal structure to reduce the installation area of the dust collector, but has a structure that is installed in multiple stages up and down to drop dust attached to the filter downward. A bridge phenomenon that sticks to the top may appear and reduce the filtration efficiency of the filter.

By the way, in the case of the present embodiment, it is possible to prevent the accumulation of dust even when installed horizontally by improving this problem.

Although specific embodiments according to the present invention have been described so far, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, but should be defined by not only the scope of the claims to be described later, but also those equivalent to the scope of these claims.

As described above, the present invention has been described by the limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art in the field to which the present invention belongs can make various modifications and transformation is possible Therefore, the spirit of the present invention should be grasped only by the claims described below, and all equivalent or equivalent modifications thereof will be said to belong to the scope of the spirit of the present invention.

1: ceramic support manufacturing device
100: ceramic support
110: carrier
120: ceramic slurry
S100: ceramic support manufacturing step
S110: carrier bonding step
S120: molding step
S130: Primary dry sintering step
S200: coating step
S300: Secondary dry sintering step

Claims (20)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete a ceramic support manufacturing unit for manufacturing a ceramic support by binding the ceramic slurry to the support;
a coating unit for coating an auxiliary material on the ceramic support;
a molding unit for molding the ceramic support by placing it in a mold; and
a drying and sintering unit for drying and sintering the molded ceramic support;
Including,
The coating slurry used as the auxiliary material is prepared by mixing an organic binder, an inorganic binder, ultrapure water and diatomaceous earth,
The ceramic support combines the ceramic slurry with the support using a tape casting method,
The carrier is paper, cardboard or tape,
The ceramic slurry contains 60 to 70 parts by weight of alumina, hydrocarbon or diatomaceous earth as a ceramic raw material, and 30 to 40 parts by weight of sodium silicate, potassium silicate or inorganic binder IB-A10 as a liquid inorganic binder, and as a pore-forming agent 100 parts by weight of the mixture of the ceramic raw material and the inorganic binder A ceramic filter manufacturing apparatus comprising 2 to 5 parts by weight of wood powder or activated carbon and 3 to 10 parts by weight of a surfactant as a foaming agent. delete delete delete delete

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