JPH08310882A - Production of open-cell soft ceramic - Google Patents

Abstract

PURPOSE: To prevent a change in the raw material and process in accordnace with the purpose, to eliminate trouble in selecting a cell forming material and to obviate an increase in cost by incorporating sawdust into a slurry as a mixture of clay and water, forming and then firing the slurry. CONSTITUTION: A clay M as a mixture of water-elutriated clay and saba clay is sent to a kneader 20 by a conveyor 10, a specified amt. of water W is injected, and the mixture is agitated for 2 to 3hr to form a slurry S. The slurry S is sent to a mixer 30 by a pump, 80-190 pts.wt. of sawdust P is added to 100 pts.wt. of the clay, the materials are agitated and mixed for 20 to 30min until an appropriate viscosity is reached, the mixture is forced into the formwork of a forming machine 40, pressed and formed into a rectangular parallelopiped and placed on a pallet. The formed block is introduced into a drying furnace 50 and dried until the surface of the formed block B turns white, placed into a firing furnace by a firing truck and fired at 800-1320 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing continuous pore soft ceramics having fine continuous pores inside, inexpensive and lightweight, and having continuous pores excellent in adsorption, heat insulation and sound absorption. It is about.

[0002]

2. Description of the Related Art Conventionally, what is called hard ceramics that does not have pores inside and is extremely dense and has excellent hardness and strength has been used. It is made by molding clay or other mineral powder and drying it. In addition, it is fired in air or under a nitrogen atmosphere.

Unlike the above-mentioned hard ceramics, the continuous pore soft ceramics having fine pores are lightweight,
It is also well known that it is widely used because of its excellent filterability, adsorptivity, heat insulation, sound absorption, and ability to support a catalyst containing an enzyme.

However, among the above-mentioned conventional ceramics, the continuous pore soft ceramics have different raw materials, additives, and manufacturing methods depending on the purpose of use, which makes it difficult to select a pore-forming material and the treatment conditions are severely limited. However, there is a problem that the cost becomes high.

[0005]

The problem to be solved is that among the above-mentioned conventional ceramics, the continuous pore soft ceramics have different raw materials, additives, and manufacturing methods depending on the purpose of use, and the selection of the pore forming material. However, the present invention provides a method for producing a continuous pore soft ceramics, which solves the above-mentioned problems because the cost is high because the treatment conditions are severely limited and the treatment conditions are severely limited.

[0006]

[Means for Solving the Problems] The first aspect of the present invention is to add ogre powder as a pore-forming material to a slurry prepared by adding and mixing water to clay, molding, drying, and then firing in air or in a nitrogen atmosphere. A method for producing a continuous-pore soft ceramics characterized by the above.

A second aspect of the invention is, in addition to the constitution of the first aspect, 80 to 190 parts by weight of ogre powder mixed with 100 parts by weight of clay.

[0008]

EXAMPLES Examples of the present invention will be described. In producing continuous pore soft ceramics, clay 1 is added as a pore forming material to a slurry prepared by adding and mixing water to clay.
80 to 190 parts by weight of ogre powder is mixed with 00 parts by weight, molded, dried, and then fired in air or in a nitrogen atmosphere.

Explaining in concrete examples, the raw materials and their compounding ratios are as shown in Table 1.

[0010]

[Table 1]

FIG. 1 is a block diagram showing the manufacturing process. Further, the process from kneading to drying is shown in a schematic view of the apparatus as shown in FIG. Clay M, which is a mixture of Suihi clay and mackerel clay, is mixed at the above mixing ratio, and is sent to the kneading machine 20 by the transport machine 10, and a predetermined amount of water W is injected,
Stir for hours to make slurry S. Next, the slurry S of the kneading machine 20 is sent to the mixer 30 by a pump, a predetermined amount of the ogre powder P is added while stirring, and stirring and mixing are continued for 20 to 30 minutes until an appropriate viscosity is reached.

The slurry S which has been mixed is molded by the molding machine 40.
It is pressed into the frame of No. 3, pressurized, molded into a rectangular parallelepiped shape (brick shape), and placed on a pallet. It should be noted that the mixture will ooze out if the pressing force into the mold is too high. The pallet is placed on the shelf of a drying cart and sent to the drying furnace 50, and is dried until the surface of the molding block B becomes white (2 to 3 days and nights). It should be noted that if the drying is insufficient, it will be pulverized into a ash when firing.

The dried molded block B is transferred to a truck for firing. As a stacking method at that time, there are a double girder type shown in FIG. 3 and a vertical arrangement shown in FIG. Both have merits and demerits, and it does not mean that we have to decide which one.
When the forming block B loaded on the trolley for firing is put into the firing furnace 60 and the temperature is raised, the water content flies, the ogre powder is decomposed and burned,
(Or reduction) occurs, the whole structure is broken at 800 ° C or higher, recrystallization occurs, and feldspar is melted at 1100 ° C or higher to react with clay to form glass. Temperature 1,150
When the temperature rises to 1,320 ° C., the amount of melt increases, vitrification and fine needle-like crystallization occur, and the base material is hardened to become continuous pore soft ceramics. A preferable temperature rising curve in the firing furnace is as shown in FIG.

After firing, the fired block taken out is crushed by a crusher 70, divided by a classifier 80 into each particle size, weighed and packed in a cardboard box or the like for shipment.

If necessary, the hydrophobicity can be improved by immersing in a hydrophobic liquid. Also dried,
Deodorizing property can be imparted by immersing in a ferric chloride solution and drying again.

[0016]

The chemical composition of the obtained porous soft ceramics is shown in Table 2, its physical properties are shown in Table 3, and its pore distribution is shown in Table 4.

[0017]

[Table 2]

[0018]

[Table 3]

[0019]

[Table 4]

[0020]

Since the present invention is configured as described above,
It can be manufactured at low cost, and as shown in the above table, it is lightweight, has a high specific surface area, is excellent in heat insulation and sound absorption, and has a floating oil
It has high adsorptivity for dispersed oil / emulsion oil, high oil absorption rate, high processing accuracy, no expansion / shrinkage over a wide temperature range, acid / alkali resistance, and stability against chemicals.

[Brief description of drawings]

FIG. 1 is a block diagram showing steps of an embodiment of the present invention.

FIG. 2 is an apparatus schematic view showing a part of the process of the embodiment of the present invention.

FIG. 3 is a perspective view showing a stacked state of molding blocks.

FIG. 4 is a perspective view showing another stacked state of the molding blocks.

FIG. 5 is a graph showing a temperature rising curve for firing.

[Explanation of symbols]

 10 Transport Machine 20 Kneader 30 Mixer 40 Molding Machine 50 Drying Furnace 60 Incinerator 70 Crusher 80 Classifier B Molding Block M Clay P Ogre Powder S Slurry W Water

Claims (2)

[Claims] 1. A continuous pore soft ceramics characterized in that a slurry prepared by adding water to clay is mixed with ogre powder as a pore forming material, molded, dried, and fired in air or under a nitrogen atmosphere. Production method. 2. Ogre powder 80 to 100 parts by weight of clay
The method for producing a porous soft ceramics having continuous pores according to claim 1, which comprises 190 parts by weight.