JPH11156348A - Active carbon block filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easily a pore appear at a low cost by a method wherein after making a pore appear by breaking a dense layer by spraying compressed air and an active carbon particle onto inner and outer side surfaces of an active carbon block filter wherein a surface molded by coming in contact with a mold in press molding becomes dense, the product is burnt. SOLUTION: An active carbon block 1 is provided wherein water is added to very fine active carbon and clay, kneeded, granulated, and formed in a cylindrical filter with a friction press. After drying, a dense layer is broken by spraying, for example, an active carbon particle of 30 to 60 mesh with compressed air to the dense layers on an outside surface 2 and an inside surface 3 of the filter, and the pore is made to appear by blowing off broken powder with air pressure. Thereafter, biscuit firing treatment is executed by burning. For spraying the active carbon particle, for example, an upper cup type spray gun of a 1 l container is used, and for the inside surface 3, a 200 mm long nose is used. The dense layer can easily be broken thereby, and cutting for measuring up and down can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a block type activated carbon block filter mainly used for household and commercial water purifiers, water treatment and the like.

[0002]

2. Description of the Related Art Conventionally, a cylindrical or unglazed activated carbon block filter obtained by kneading and granulating fine powdered activated carbon and clay, press-molding, and then firing at a high temperature is used. In order to form the dense layer on the surface because the granulation collapses due to the movement along, the inner and outer surfaces are cut with a lathe or the like to remove the dense layer.

[0003]

However, although cutting with a lathe has the effect of sizing, but considering the expendables, the cost per processing time is high. Productivity such as extremely small number of cutting tools, difficulty in processing cutting powder, and extremely limited cutting place where processing is performed. In addition to the poor quality, pollution and industrial waste problems were often involved.

[0004] Therefore, the present invention provides a press-molded article having a particle size adjusted at a stage where the press-molded article has obtained a strength that does not allow the dust to be scattered into the air while leaving moisture, and withstands the blowing of the particles by compressed air. Spraying activated carbon particles limited to a certain amount, destroying the dense layer formed in contact with the mold at the time of press molding, blowing it off with the activated carbon particles, making the pores under the dense layer appear, baking later and unbaking The present invention provides an activated carbon block filter that can be easily and inexpensively manufactured.

[0005] Another object of the present invention is as follows.
An object of the present invention is to provide an activated carbon block filter that can be formed in consideration of shrinkage tightness and breaks a dense layer, thereby eliminating cutting for dimensioning.

[0006]

According to the present invention, activated carbon of fine powder and clay are kneaded by adding water, granulated, and press-molded.
After natural drying to obtain molding strength, the raw material was brought into contact with the mold at the time of press molding. Activated carbon particles are sprayed to destroy the dense layer on the surface of the activated carbon block filter,
The gist of the present invention is that pores can be made to appear by blowing off, and cutting for dimensioning can be omitted in consideration of tightness in firing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a completed view of an activated carbon block filter according to the present invention. The activated carbon block 1 has an outer diameter of 105 mm, an inner diameter of 30 mm, and a height of 180 mm.
Cylindrical shape. As a manufacturing method, 5 pieces of 325 mesh Kibushi clay are added to activated carbon fine powder of 100 mesh under.
After dry powder kneading at a weight ratio of 0:50, water of 50% by weight of the total amount is added, and wet kneading and granulation are carried out for several days so that moisture is not blown, and the mixture is cured by a friction press.
After natural drying for days, the raw material slides on the contact surface with the press mold, and the granulated material collapses due to friction, forming a dense layer on the surface of the activated carbon block that is made with a slight thickness. 2. The compressed layer on the inner surface 3
Activated carbon particles having an adjusted particle size were sprayed on 0 to 60 mesh to break the particles, and the crushed powder was blown off by air pressure. The upper and lower filter caps 4 and 5 are bonded and fixed with a silicone resin.

In order to destroy the outer surface 2 and the inner surface 3 which are dense layers, it is possible to use particles such as silicon nitride and alumina used for shot blast, etc. In addition, it is assumed that not a small number of the carbon particles cut into the surface of the activated carbon block. Therefore, in the examples, activated carbon particles were used. The activated carbon particles were sprayed using an upper cup type spray gun in a 1 liter container, and a long nose of 200 mm was set for the inner surface 3. Nozzle 6 hole diameter is 3.0
mm.

[0009] Initially, it was sprayed onto a material containing a considerable amount of water immediately after being formed by a friction press. However, no matter how the air pressure was adjusted, not only a dense layer but also a deep layer other than the intended one was involved and destroyed. Therefore, it has been found that by performing the drying at the time when the remaining water content is about 30% after natural drying, the viscosity of the binder is reduced and the binder is not destroyed more than necessary. The air was blown at 300 liters per minute, and the breaking force was suppressed to 2.0 kgf / cm ² .

When activated carbon particles are sprayed from the activated carbon injection section 7 at an angle of about 90 to 45 degrees, it is difficult to adjust the thickness of the destruction layer on the surface of the block. It was also found that if the cutting was performed, the finish would be equivalent to cutting. The dense layer on the inner cylinder side was destroyed by inserting the nozzle 6 into the inner cylinder as shown in FIG. 2, setting the injection angle at about 15 degrees, and sliding the nozzle up and down.

In the length direction, if the firing temperature is constant, shrinkage due to shrinkage does not change so much. Therefore, the embodiment is extremely effective in consideration of mass productivity due to cost and processing time limitations. high. Table 1 shows the processing cost and processing time per piece, but the merit will be further enhanced if the ratio of the equipment investment of the compressor and the lathe for processing a plurality of pieces at the same time is taken into consideration.

[0012]

[Table 1]

Table 2 shows the difference in the reproduction of the fine pores obtained by cutting with the lathe and spraying the activated carbon particles from the actual water amount. Activated carbon spray, 30 seconds,
In comparison of the three types of 0.3 mm removal, 1 minute, and 0.6 mm removal, no significant difference was observed,
Decided to produce a second thing.

[0014]

[Table 2]

[0015]

As described above, according to the present invention, activated carbon particles are blown by compressed air onto a dense layer on the inner and outer surfaces of the activated carbon block filter generated during press molding.
It breaks the dense layer, blows out the crushed powder, and has the benefit of making pores easily and inexpensively. Further, according to the present invention, by taking into account the shrinkage tightening dimension, there is a practical advantage that the processing step of upper and lower dimensioning can be omitted.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view illustrating an embodiment of the present invention.

FIG. 2 is a schematic sectional view illustrating a method for processing an inner cylinder according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Activated carbon block 2 Outer side 3 Inner side 4 Filter cap 5 Filter cap 6 Nozzle 7 Activated carbon injection part

Claims (1)

[Claims] 1. Water is added to fine powdered activated carbon and clay, kneaded, granulated, and then hydraulically or frictionally pressed.
In the process after forming and drying the cylindrical filter,
Activated carbon particles are sprayed with compressed air onto a thin dense layer formed on the inner and outer surfaces of the cylindrical filter, where the granulation of the raw material moving on the inner and outer surfaces of the press mold during press molding collapses,
An activated carbon block filter characterized by being able to break down the dense layer to make fine pores appear, and then fire it to form an unglazed state, thereby being able to dramatically improve production efficiency at low cost without depending on cutting of the dense layer.