JPS61174178A - Soft ceramic sintered body and manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oxide-based soft ceramic sintered body having significant effects on water treatment, greening, processing materials, etc., and a method for producing the same.

Traditionally, new ceramics have been broadly divided into oxide ceramics and non-oxide ceramics, with Al2O having particularly excellent hardness, room temperature strength, corrosion resistance, and electrical insulation properties.
Oxide-based ceramics whose main component is 5 (alumina) became popular at a relatively early stage, mainly as electronic materials that utilize electromagnetic functions, and are also thermally sensitive.

Due to its mechanical function, it is used in insulation materials, super tools, mechanical tools, fluid machinery and parts, etc.

On the other hand, the present invention is an inorganic light clay.

Diatomaceous earth and natural earth materials are molded as they are naturally.

The purpose is to provide an oxide-based soft ceramic sintered body obtained by firing, and its gist is that 62.8 to 67% by weight of SiO□ and 20 to 2'i'
wt% Al2O3 and 0.8-1.0 wt% Fe2O
3 and 0.5-0.65% by weight of K2O. and 0.5~0.
The present invention proposes a method for producing the soft ceramic sintered body. The gist of this is that about 20% by weight of inorganic light clay of about 350 meshes
As before, about 3% by weight of mesh diatomite and about 7% by weight of low-temperature sintering agent made by specially fermenting natural earth materials were uniformly kneaded in a mixer equipped with rollers that can be raised and lowered. After adding about 30% by weight of wood chips or sawdust and about 50% by weight of water to the kneaded raw material, the mixture is stirred and kneaded so that the whole is homogeneous using a mixer to form a soft ceramic raw material.1. After putting the amount into a predetermined case, it is dried at a temperature of 40 to 130°C for a required time, and then fired at a temperature of 1050 to 1160°C for a required time.

Thus, the soft ceramic sintered body according to the present invention has a complex multi-pore, fully connected pore structure, has oil absorption and ion exchange properties, and is capable of adjusting pH, removing SS, lowering COD, and removing proteins from animals and plants. It is used for water treatment as an oil absorbent, and also has water retention and fertilizer retention properties.

Used for greening as a breathable growth base improvement material, lightweight heat insulation, sound absorption, sound insulation, tear resistance, and cushioning properties.

Used in construction work as a hydrophobic and nonflammable building material.

In addition, filters with deodorizing and oil-absorbing properties are highly effective when used to preserve pond water, remove nitrogen, remove blood, etc., and furthermore, after use, filters with deodorizing and oil-absorbing properties can be used to reduce the thermal decomposition temperature of various substances. By incinerating it in a recycling incinerator, it can be reused many times, and no matter where it is disposed of after final use, it will simply be returned to soil and there will be no secondary pollution.

The main raw material for the soft ceramic sintered body according to the present invention is inorganic light V-
) ultra-fine powder (about 350 mesh) and ultra-fine powder (about 350 mesh) of diatomaceous earth from the Tertiary to Quaternary period (J Engineering S standard), 65% feldspathic, 20% siliceous, A low-temperature sintering agent made by specially fermenting a natural earth material having clay elements is suitable. In this case, special fermentation means pouring water onto the natural earth material and heating it to a temperature of about 4o0C, then pouring a sheet or sinter over it from above. This means that if you leave it for 3 to 4 days, it will become feverish.

In order to obtain a soft ceramic sintered body with a double-suction type complex connected porous structure, a mixture of water and sawdust or wood chips of about 48 mm in natural earth material was added to the kneaded main raw material, stirred, and molded. The sintered body obtained by this process is characterized in that it does not release the absorbed oil or moisture. In addition, in order to obtain a soft ceramic sintered body with a connected porous structure, crushed urethane mixed as an aggregate in natural earth raw materials is added to the main raw material of the kneading method, stirred, shaped, and then fired. The sintered body thus obtained has high strength, especially pressure resistance, and is porous and lightweight.

Further, the preferred blending proportions of the main raw materials in the manufacturing method of the present invention are as follows in terms of weight ratio (the specific gravity of each raw material is different).

Inorganic light clay 2.0 Diatom ± (13 Low-temperature sintering agent α7 Wood chips or sawdust 3.0 (mixed in the kneading process) The double suction complex porous structure in the body consists of wood chips or sawdust to be mixed into the main raw material for kneading. The connected porous structure is produced by the calcination of the molded raw material containing sawdust, but the connected porous structure is caused by the water to be added into the kneaded base material.One embodiment of the invention will now be described.

First, appropriate amounts of inorganic light clay, diatomaceous earth, and low-temperature sintering agent adjusted in the proportions described above are weighed and mixed uniformly in a wet pan (mixer) equipped with rollers that can be raised and lowered. The mixed raw materials are transported to the bunker and stored as appropriate. Next.

Wood chips or sawdust (or crushed urethane) and water in the above-mentioned proportions are mixed into the kneaded raw materials from a quantitative supply hopper and a quantitative supply water tank, respectively, and the entire mixed raw material is uniformly mixed with a water content of about 60% using a mixer. The raw materials are stirred and kneaded to produce soft ceramic raw materials, and the raw materials are stored in a raw material tank.

Next, the adjusted raw material is put into a suitably insulated brick-sized case using a pouring hose, etc., and molded. It is desirable to mold uniformly using a molding machine.

Next, the molded product is loaded onto a drying and firing cart and placed in a drying furnace that is connected to each other through a circulation duct to utilize waste heat, and a firing furnace that is equipped with a tunnel kiln type heat source burner, as shown below. It is then dried and fired.

The molded product is molded into an element that has double suction type complex multi-pores and connected pores, and contains a large amount of water to form the connected pores, so the first drying process is carried out at room temperature in the drying oven. to 40°C for about 4 hours, and the second drying step is 80°C.
In the third drying step, which is the final drying step, for about 3 hours at °C,
Drying oven performance.

Although it varies depending on capacity etc., the maximum temperature is 130℃,
In particular, it is necessary to avoid a temperature rise that would ignite wood chips or sawdust on the surface (it takes about 48 hours in the currently used refractory brick furnace).

Next, the dry molded product is placed in a firing furnace and fired.
The firing process is an extended drying process, so the temperature is around 150℃.
Keep it for about 2 hours, and in the second firing process, the temperature rises to around 350℃ and the heat source burner or heating element is stopped, and the temperature reaches the combustion gasification temperature of wood chips or sawdust, so it ignites and becomes like a flower blooming. Leave it in a state of self-combustion. Do not ignite the heat source burner or heating element until self-combustion is completely completed (about 8 hours). When the self-combustion is completed, the temperature is about 500℃, but it is necessary to keep it at around 570℃ for about 1 hour to prepare the first grain boundary layer, and in the fourth firing process as a finishing process, the temperature increases to about 1050-1160℃. The product can be obtained by keeping it warm for about 3 hours.

In addition, in the example above, when producing a double suction type multiporous product, diatomaceous earth, which itself has fine pores, is used to increase the adsorption speed.
When the diatomaceous earth is added, finishing and firing are performed at 1050°C, and if the purpose of the product is to be a filter material, on the other hand, the temperature in the fourth firing step is set to 1160°C in order to use a raw material that does not contain diatomaceous earth.

'□ Next, the finishing process is molded according to the purpose.As the product has a porosity of around 80cm, there is a lot of loss (powderization) during processing, so it is important to shorten even one step, so soft ceramic processing machines are used. It is preferable to use a diamond cutter-two-stage processing machine provided as a diamond cutter.

The physical properties and chemical composition of the soft ceramic sintered body according to the present invention are shown in the table below.

As described above, the soft ceramic sintered body produced by the method of the present invention has the following effects.

(1) Due to its complex multi-porous or connected porosity structure, it does not quickly adsorb and release the fluid from the outside static state due to its initial adsorption motion, allowing the dyeing liquid to pass through and become fresh water. At the same time, hard water can be softened and chemical solutions can also be removed.

(2) Excellent breathability and no deterioration of adsorbed substances such as chemicals and fertilizers.

(3) Because of its softness, it is also effective in deodorizing.

Deodorizes livestock manure, etc. by simply mixing product powder or granules.

Can be dehydrated.

(4) In soil improvement, it is possible to improve the acidity and strong alkalinity by maintaining air permeability, adsorption water properties, and water retention fat properties for a long time and releasing it in small amounts to achieve the maximum effect.

(5) Not only does it adsorb and purify fine sludge from lakes, marshes, rivers, etc., but by using a block-shaped filter when discharging water, the entire discharge channel becomes an over-chamber, making it ideal for mass water purification. It can also be used for primary filtration from seawater to fresh water and for filtration of strong salts and fine dust.

(6) In hydrophobic treatment, only oil is adsorbed, water passes through it very comfortably, and the adsorbed oil is not easily released, so oil and water can be separated reliably and effectively.

(7) Stability through ventilation and hydrophobicity of foundations in buildings.

It is highly effective when used in protective equipment, etc., and also has sound absorption and sound insulation properties.

Demonstrates unique effects on tear resistance, cushioning properties, etc.

Claims (1)

[Claims] (1) 62.8-67% by weight of SiO_2 and 20-27% by weight
wt% Al_2O_3 and 0.8-1.0 wt% Fe
It is characterized by having a composition containing _2O_3, 0.5 to 0.65% by weight of K_2O_3, and 0.5 to 0.7% by weight of CaO, and having an igros content of 6.9 to 7.7%. Soft ceramic sintered body (2) Approximately 20% by weight of inorganic light clay of approximately 350 mesh, approximately 3% by weight of diatomite of mesh as before, and approximately 7% by weight of a low-temperature sintering agent made by specially fermenting natural soil raw materials. Approximately 30%
After adding % by weight of wood chips or sawdust and about 50% by weight of water, the mixture is stirred with a mixer so that the whole is uniform.
After kneading to obtain a soft ceramic raw material, and then putting an appropriate amount of the raw material into a predetermined case, it was heated to 40 to 13
Dry at a temperature of 0℃ for the required time, and then dry at a temperature of 1050~11
A method for producing a soft ceramic sintered body characterized by firing at a temperature of 60°C for a required period of time. (3) A method for producing a soft ceramic sintered body according to claim (2), in which the natural earth material contains 65% feldspathic material, 20% siliceous material, and clay elements. (4) A method for producing a soft ceramic sintered body according to claim (2), in which crushed urethane is added as an aggregate instead of wood chips or sawdust.