KR930005251B1 - Method of ceramic diffuser - Google Patents

Abstract

The ceramic diffuser by a vibration packing method is prepared by (a) putting the preformed core (6) with silicon carbide, corundum and silica sand into the center of the steel mold (5), (b) putting the binder with alumina, silica and epoxy resin for the diffuser molding into the steel mold around the core, (c) molding the body with a tube type by vibration force, (d) heating and curing the molded body at 80-100 deg.C for 20 min. in the drying chamber, and (e) removing the internal core by sintering at high temperature, 1200-1300 deg.C.

Description

Manufacturing method of ceramic diffuser by vibratory filling method

1 is a perspective view of an apparatus for molding an article of the present invention.

2 is a cross-sectional view of the main portion of FIG.

3 is a cross-sectional view of the molded article.

4 is a cross-sectional view of a state of use of the assembled ceramic diffuser.

* Explanation of symbols for main parts of the drawings

1: fixing plate 2: diaphragm

3: spring 4: vibrator

5: steel mold 6: core material core

The present invention relates to a method of manufacturing a CERAMIC DIFFUSER of the micro-processing type, specifically, to purify phenol and sewage into a sewage treatment tank and forcibly blows air into a ceramic (CERAMIC) tube to form an air bubble. The present invention relates to a method for producing a fine multi-porous ceramic diffuser that generates and dissolves oxygen in air in sewage to purify wastewater and sewage. Generally, as a molding method for manufacturing a ceramic diffuser, a press method using a press, an injection method by an injection molding machine, an injection molding method, and the like are known.

Here, the press method using the press is the most ideal method in the form of a thin plate, but in the form of a relatively long (500 mm or more) cylindrical tube, the structure of the upper, middle, and lower portions is not uniform, resulting in uniform pore distribution. There is a problem that the efficiency of oxygen dissolved amount cannot be reduced, and the injection method by the injection molding machine forms a uniform pore distribution, but it is difficult to inject in a coarse particle (24-36 mesh) diffuser. Therefore, the economic burden is a big problem.

In addition, the injection method takes a lot of time to prepare the compound in a slurry state, injects it into a mold, and dries it, and requires dimensional processing. Is.

The present invention devised a new manufacturing method by vibrating filling method to solve the problems of the diffuser manufacturing method according to the conventional method as described above in detail by the accompanying drawings as follows.

1 is a diagram illustrating a configuration of a vibrating filling device applied to the present invention, in which a diaphragm 2 having a vibrater 4 mounted on a center portion thereof is mounted on a fixed base 1 in a spring 3 state. It is installed so as to maintain a constant height (H) and the steel mold (5) made of a metal tube corresponding to the outer diameter of the diffuser on the upper surface of the diaphragm (2) is fixed by mounting means such as bolts.

In order to form the diffuser of the present invention, a core rod material for forming a tube body of a diffuser is required. A variable core material core is required to maintain a rod-shaped body at a low temperature and to lose its original shape by decomposing condensation at a high temperature of 1000 ° C. or higher. .

In other words, if the preform is formed into a tubular shape during the firing of the diffuser and fired at a high temperature of about 1200-1300 ° C, the tubular specification must be deformed during the firing process. Should be maintained to prevent deformation of the tube shape. Therefore, it is necessary to separate the inner core corner to maintain this support.

Core core was prepared by mixing 16 particle size, 95% or more hydrocarbons, Korandam, and silica sand, adding 10 parts of epoxy resin as a temporary binder binder to 100 parts of these mixtures, and circulating 80-100 ℃ hot air. Samjae core 6, which is a standard product made of rod-shaped bodies, is produced in an electric furnace and a drying furnace.

The diffuser molding binder is 30-36 mesh in particle size, more than 95% of inorganic alumina (Al ₂ O ₃ ) or silica (Silica) 100 parts and silicon oxide (SiO ₂ ) inorganic binders 20-25 parts and temporary 6-8 parts of an epoxy resin having a viscosity of 9000-11000CPS at 25 ° C. in a binder was placed in a mixer and mixed for 10-15 minutes to form a blender for forming a diffuser.

It will be described in more detail bar to be produced by the diffuser required by the present invention using the raw material.

The core core 6 is inserted into the steel molds 5 respectively disposed on the diaphragm 2 of the vibrating apparatus as shown in FIG. 1 and supported by the upper and lower fixing jig 6a so as to be temporarily fixed.

In this state, the compound for forming the diffuser is introduced into the inside of the steel mold 5, while the vibrating plate 2 is vibrated by operating the vibrator 4 during the feeding process, and the compound is added while the vibration is applied to the entire steel mold 5. To be.

When the prescribed compounding is completed, the vibration is stopped, the upper plate 6b is introduced, and then the entire mold is transferred from the diaphragm 2 to the drying stand.

At this time, the upper plate (6b) is placed on the opposite side to go to the bottom of the drying table to equalize so that the lower side of the density phenomenon of the density is slightly denser than the upper by the self weight.

In this state, heat-harden for 20-30 minutes in the drying room of 80-110 degreeC, and demold in a demolding apparatus.

Thus studded the cured core material core (6), semi-finished products are baked at a high temperature of 1200-1300 ℃ binder for molding the diffuser soseongjung is silicon oxide is not an organic binder are both oxide (SiO ₂₎ is the main component of the inorganic binder is alumina Join the particles.

In addition, since the core core portion of the inner core core is removed by heat, only the original material remains and the original shape is broken, and the broken material is recovered and reused.

The ceramic diffuser manufactured as described above has a uniform air bubble when the uniformity of the tissue, that is, the pore is uniform, and the raw material is ceramic. If the pores are blocked by the re-burned at a low temperature to open the pores can be used semi-permanently. Referring to the embodiment of the manufacturing method of the diffuser of the present invention.

EXAMPLE

(1) Ceramic Diffuser Dimensions:

Outside diameter 75cm, height 500mm, inside diameter 50mm

(2) Composition of binder for diffuser

30 parts of particle size, 100 parts of alumina or silica (silica) of 95% or more, and 6 parts of organic binder epoxy resins which are temporary binders.

(3) Firing of binder for core core

16 mesh of particle size, 100 parts of 95% or more silicon carbide, and 6 parts of epoxy resins which are organic binders which are temporary binders.

By virtue of the above formulation, the core core part weighed 2.0 kg and the fuser part weighed 2.5 kg in a vibratory manner, and was cured by heating in an 80-100 ° C. drying chamber for 20 minutes, followed by demolding and baking in a calcination furnace at 1280 ° C. .

The ceramic diffuser produced by the above method was prepared as a good ceramic diffuser having a processing size of about 400 µ, a processing rate of 38%, an oxygen dissolved amount of 30%, and a bending strength of 200 kg / f or more.

Claims (1)

In the case of injecting and molding a binder for forming a diffuser mainly composed of alumina silica into the steel mold 5, the core core 6 mainly containing silicon carbide, corandal and silica sand is preliminarily formed in the center of the steel mold 5. After molding and incorporating the diffuser-forming binder into the main surface of the core core 6, applying a vibration force to form a molding binder in a tubular shape, and sintering it by a known method at high temperature to form the core core 6 therein. Method for producing a ceramic diffuser by vibrating filling method characterized in that the removal.

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