JP2003212640A - Inorganic foamed body, its composition and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inorganic foamed body which has a narrow pore size distribution and efficiently exhibits effects on purification of water or air and elution of a mineral by using the function of pores arranged three-dimensionally, is most suitable as a filter medium for water or air, a purifying material, a deodorizing material, a dehumidifying material or a soil conditioning material and has a wide range of application and to provide a composition of the inorganic foamed body, and a method for manufacturing the inorganic foamed body. <P>SOLUTION: This inorganic foamed body is obtained by firing inorganic powder containing the granite porphyry powder obtained by crushing granite porphyry. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic foam using an inorganic waste such as glassy waste, incineration ash, brick waste, etc., an inorganic foam composition and a method for producing an inorganic foam. Is.

Conventionally, glass, which is a kind of inorganic waste material, such as glassy waste material, coal ash, etc., is used to form uniform, independent or continuous bubbles in a matrix of glassy material, etc., and is excellent in heat insulation and soundproofing. Quality foams and lightweight artificial aggregates have been developed. For example, "Patent Document 1" states that "waste glass is crushed to form a powdery granule, and at least one kind of metal carbonate such as sodium carbonate, metal carbide such as silicon carbide, and metal nitride such as silicon nitride is added thereto. A method for producing a glass foam by adding and heating is disclosed.

[Patent Document 2] describes that "a material obtained by crushing bottle glass or the like and limestone powder is mixed and then granulated.
The manufacturing method of the foam glass heated at -960 degreeC is disclosed.

(Patent Document 3) "Artificial lightweight that coal ash is mixed with waste glass, a binder, and a foaming agent such as iron oxide, silicon carbide, carbonaceous material, crushed, and then molded and fired. A method of manufacturing an aggregate "is disclosed.

(Patent Document 4) discloses "a method for producing a glassy foam by mixing coarsely pulverized glass powder and finely pulverized glass powder, adding silicon carbide to the mixture, and heating".

[0006]

[Patent Document 1] Japanese Patent Laid-Open No. 11-343128

[Patent Document 2] Japanese Patent Laid-Open No. 58-60634

[Patent Document 3] Japanese Patent Laid-Open No. 11-335146

[Patent Document 4] Japanese Patent Laid-Open No. 11-236232

[0007]

However, the above conventional techniques have the following problems. In the technology disclosed in (1) (Patent Document 1), since the particle size of powdered waste glass is not specified, the molten state or foaming depends on the particle size of the waste glass even if the raw material heating conditions are constant. There is a problem that the state is different, the specific gravity and the size of bubbles are not stable, and the quality is not stable. (2) The techniques disclosed in (Patent Document 1) to (Patent Document 4) were developed for use in lightweight aggregates, heat insulating materials, soundproofing materials, etc. by utilizing only the characteristics of having bubbles and having low specific gravity. However, the functions of the bubbles arranged three-dimensionally are not fully utilized, and there is a problem that the added value is low and the applicability is lacking. (3) Since the particle size distribution of bubbles is very wide, there is a problem that when used as a filtering agent or a heat insulating material, the filterability and the heat insulating property are insufficient. In particular, when open cells are formed, there is a problem that the heat insulating property is remarkably lacking.

The present invention solves the above-mentioned conventional problems and has a narrow particle size distribution of bubbles and has the effect of purifying water and air, the elution of minerals, etc., and is a filtering material for water and air, a purifying material, a deodorizing material,
It is an object of the present invention to provide an inorganic foam which is optimal as a dehumidifying material or the like or as a soil improving material or the like and which is excellent in applicability. Further, the present invention has water and air purification and mineral elution effects, etc., and is optimal and has excellent applicability as a water and air filter, a purification material, a deodorizing material, a dehumidifying material, etc. An inorganic foam composition capable of producing an inorganic foam can be provided. Furthermore, the present invention provides a method for producing an inorganic foam capable of efficiently producing a water / air purification effect, a mineral elution effect, and the like by using the function of three-dimensionally arranged bubbles. To aim.

[0009]

In order to solve the above-mentioned conventional problems, the inorganic foam, the inorganic foam composition and the method for producing the inorganic foam of the present invention have the following constitutions. .

The inorganic foam according to the first aspect of the present invention has a structure obtained by firing an inorganic waste material containing barite stone powder obtained by pulverizing barley stone. With this configuration, the following effects are obtained. (1) By the action of silicic acid anhydride, etc. of porous barite stone, it is possible to adsorb and remove heavy metals such as chlorine and cadmium dissolved in water, various bacteria, etc., and purify by purifying water and water in the air. Excellent in deodorizing property. (2) Since it contains barley stone, it has an infrared radiation effect and can be used as a heating medium for heating equipment, drying equipment and the like. Also, it is effective in activating and sterilizing water, promoting plant growth, and the like.

Here, as the inorganic powder, a powder obtained by pulverizing an inorganic waste material is used. As the inorganic waste materials, glassy waste materials, incinerated ash, brick waste materials, livestock and fish bones, etc. are used, and one kind or a mixture of two or more kinds thereof can be used. Glassy waste materials are generated from chemical bottles, cosmetic bottles, food seasoning bottles, glass bottles such as beverage bottles, plate glass, window glass, wastes such as glass panels of TVs and displays, and glass product factories. Scrap or the like is used. As the incineration ash, coal ash of a combustion device which mainly uses solid fuel such as coal power generation, garbage power generation, or municipal waste incinerator is used. As the brick waste material, wastes such as red bricks, refractory bricks, lightweight bricks, pavement bricks, glaze bricks, slag bricks, silica ash bricks and cement bricks, scraps generated from brick product factories, etc. are used. The bones of livestock and fish include cows, pigs,
Bone obtained when processing livestock and fish such as horses and chickens is used. Of these inorganic waste materials, glassy waste materials are particularly preferably used. Since many glassy waste materials are softened at a low temperature of 1000 ° C. or less, the load on the equipment such as a heating furnace is small, and the melt is viscous so that bubbles are easily formed and a long inorganic foam such as a plate is formed. This is because it is easy to form the body. Therefore, it can be mixed with other inorganic waste material at a predetermined ratio to lower the melting point and increase the viscosity of the melt.

The inorganic foam composition according to claim 2 of the present invention comprises (a) 100 parts by weight of an inorganic powder obtained by pulverizing an inorganic waste material, and 100 parts by weight of the inorganic powder. ,
(B) Alkali metal or alkaline earth metal carbonate or hydroxide, metal carbide selected from silicon carbide, titanium carbide, boron carbide, tungsten carbide, zirconium carbide, silicon nitride, titanium nitride, boron nitride, aluminum nitride 0.1 to 30 parts by weight of a foaming agent of any one of metal nitrides selected from (1) to 35 parts by weight of (c) barley stone powder obtained by pulverizing barley stone, preferably 2 to Three
And 0 parts by weight. With this configuration, the following effects can be obtained. (1) Since an appropriate amount of the inorganic powder, the foaming agent, and the barley stone powder are contained, the action of the barite stone such as the adsorptivity, and the distribution and mechanical properties of the bubbles of the inorganic foam that retains it. The balance of strength can be optimized, as a lightweight civil engineering and construction material, or as a filtering material for water and air, a purification material,
It is ideal as a deodorant, dehumidifier, etc., or as a soil conditioner, and has excellent applicability. (2) Since it contains an appropriate amount of barley stone powder, the barley stone powder is dispersed and supported in an inorganic foam to increase the bulk, and the far-infrared radiation effect of barley stone is obtained. It is possible to increase the surface area and increase the action of barley stone by increasing the amount of barley stone, which is expensive to produce a body, and uses it in a small amount.

The particle size of the inorganic powder obtained by crushing the inorganic waste material is 0.01 to 3000 μm, preferably 0.1 to 1000 μm, more preferably 0.5 to 5.
00 μm is preferable. When the particle size is 0.5 to 500 μm, it is possible to obtain an inorganic foam which is excellent in mechanical strength and is hard to crack even after cooling after heating and melting. As the particle size becomes smaller than 0.5 μm, the pulverization efficiency of the inorganic waste material decreases, the crushing equipment load and the man-hour increase, and it tends to melt during firing, and it tends to be difficult to control the melting temperature. 0.1μ
This tendency becomes larger as the particle size becomes smaller than m, and the amount collected by the dust collector such as a bag filter at the time of crushing increases, and the load on the crushing equipment tends to increase. Further, as it becomes larger than 500 μm, since the gap between the inorganic powders is large, it is difficult to melt and bond at the time of firing, the mechanical strength is lowered, and the inorganic foam tends to be easily cracked at the time of cooling after heating and melting. This tendency becomes larger as the particle size exceeds 1000 μm, and the specific gravity of the inorganic foam increases depending on the type of the inorganic powder, making it difficult to control the specific gravity of the product of the inorganic foam. Since the thermal conductivity is low, it is difficult to transfer heat to the inside of the inorganic powder during firing, and a portion where the firing is insufficient is formed, and the mechanical strength of the inorganic foam tends to decrease.
Especially if the particle size is smaller than 0.01 μm or 3000 μm
When the value is larger than m, these tendencies are remarkable, and neither is preferable. It is also possible to granulate an inorganic powder having a particle size within this range and use it as a granulated powder having a predetermined particle size.

The particle size distribution of the inorganic powder is 10
100% by weight of integrated sieve of inorganic powder of 00 μm
It is particularly preferable that the content thereof is 50 to 70% by weight in terms of cumulative sieving with a particle size of 250 μm, and 70 to 90% by weight in terms of cumulative sieving with a particle size of 500 μm. The inorganic powder having this particle size distribution has excellent mechanical strength because the sintering progresses sufficiently during heating and melting, and it is possible to form an inorganic foam having excellent homogeneity by uniformly dispersing cells. . The inorganic powder having a particle size of 1000 to 3000 μm can be added and mixed at a ratio of 0 to 30 parts by weight with respect to 100 parts by weight of the inorganic powder having a particle size of 0.1 to 1000 μm. As a result, depending on the amount added,
The specific gravity of the inorganic foam formed can be increased, and the specific gravity of the product of the inorganic foam can be easily controlled. By setting the specific gravity to 1 or more, it easily settles in water under its own weight, which is particularly convenient when performing filtration or activation of water, and by setting the specific gravity to less than 1, weight reduction can be achieved. it can. In addition, 0.1-1
1000 to 30 for inorganic powder having a particle size of 000 μm
When the inorganic powder having a particle diameter of 00 μm is not added (when the addition amount is 0 part by weight), the cells are uniformly dispersed and an inorganic foam having excellent homogeneity can be formed. The addition amount of the inorganic powder having a particle diameter of 1000 to 3000 μm is 30
When the amount is more than the weight part, it is not preferable because the heat is not easily transferred to the inside of the inorganic powder during firing and a large number of locations where the firing is insufficient are formed, and the mechanical strength of the inorganic foam tends to decrease. . When the inorganic powder having a particle size of 1000 to 3000 μm is not added and mixed, the powder can be pulverized again using a crusher such as a hammer crusher to be used as an inorganic powder having a particle diameter of 1000 μm or less.

Examples of the foaming agent include carbonates or hydroxides of alkali metals or alkaline earth metals, metal carbides selected from silicon carbide, titanium carbide, boron carbide, tungsten carbide and zirconium carbide, silicon nitride, titanium nitride,
Any one or more of metal nitrides selected from boron nitride and aluminum nitride are used. Examples of alkali metal or alkaline earth metal carbonates or hydroxides include Na ₂ CO ₃ , K ₂ CO ₃ , CaCO ₃ , MgCO ₃ , and C.
a (OH) _{2 and the} like are preferably used.

The content of the foaming agent is the inorganic powder 10
0.1 to 30 parts by weight is preferably used with respect to 0 parts by weight. When the mixing amount of the foaming agent is less than 0.1 parts by weight, the amount of carbon dioxide gas, nitrogen gas, etc. generated by decomposition of the foaming agent is small, the amount of bubbles is small, and the specific gravity of the inorganic foam is small. It tends to be difficult to make it porous and the like, and as the amount exceeds 30 parts by weight, the amount of carbon dioxide gas generated by decomposition of the foaming agent is large, and cracks are generated on the surface of the inorganic foam and the gas escapes. However, the bulk tends to increase, and the mechanical strength tends to decrease.

The average particle size of the foaming agent is 0.1 to 20.
0 μm, preferably 1 to 100 μm is suitably used.
As the average particle size of the foaming agent becomes smaller than 1 μm, it tends to agglomerate and tends to be difficult to uniformly disperse in the inorganic powder,
As it becomes larger than 100 μm, a large amount of gas is generated when it is heated and decomposed, and it tends to easily form coarse bubbles. In particular, when the average particle size is smaller than 0.1 μm or larger than 200 μm, these tendencies are remarkable, and thus both are not preferable.

Instead of the foaming agent or in addition to the foaming agent, shell powder obtained by crushing bivalves or conch shells such as oysters, scallops, red clams, clams, clams, abalone, turban shells, clams, mussels, and mussels is used. It can be added and mixed. As a result, the following effects are obtained. (1) The shell has not only calcium ions but also magnesium ions, and these reduce the viscosity of the melt in which the inorganic powder is melted and reduce the residual strain generated during cooling, which makes cracking difficult during cooling. It is easy to form a long inorganic foam such as a plate and has excellent moldability. (2) Calcium oxide produced by decomposition of shell powder by heating absorbs water and carbon dioxide, so that an inorganic foam having excellent hygroscopicity can be produced. (3) Since calcium hydroxide produced by absorbing water by calcium oxide is easily eluted, it is possible to manufacture an inorganic foam that can be used as a soil modifier. (4) When the inorganic foam formed by heating is immersed in water as a water purification treatment material, calcium, magnesium, etc. elute in water from the fracture surface of the inorganic foam or the shell residue from which the shell powder is decomposed. . As a result, the phosphoric acid dissolved in water reacts with the eluted calcium or is adsorbed by the calcium component in the inorganic foam to become calcium phosphate (insoluble), which can improve the water quality. In addition, the eluted magnesium can promote the growth of shellfish and algae.

The content of the foaming agent and / or the shell powder is preferably 0.1 to 30 parts by weight based on 100 parts by weight of the inorganic powder. is there.
The reason is the same as that explained in the content of the foaming agent. The particle size of the shell powder is 0.01 to 300.
0 μm is preferable. As the particle size of the shell powder becomes smaller than 0.01 μm, the amount of particles collected by a dust collector such as a bag filter during crushing increases, the load on the crushing equipment and man-hours increase, and the shell powder easily aggregates. It tends to be difficult to uniformly disperse in the inorganic powder, and as it becomes larger than 3000 μm, a large amount of gas is generated when one shell powder is decomposed by heating and coarse bubbles are easily formed,
Since there is a tendency that the inorganic foam easily breaks from that point as a starting point, neither is preferable.

The content of the barley stone powder obtained by pulverizing the barley stone is 1 to 3 parts by weight with respect to 100 parts by weight of the inorganic powder.
5 parts by weight, preferably 2 to 30 parts by weight are suitably used. As the mixing amount of barley stone powder is less than 2 parts by weight, the action of the barley stone such as adsorption power tends to decrease, and the deodorizing action or purifying action tends to decrease, and as the amount exceeds 30 parts by weight, inorganic foaming occurs. There is a tendency that the mechanical strength of the body is lowered and the body is easily broken, and the barley stone powder is easily separated from the inorganic foam. In particular, if the amount is less than 1 part by weight or more than 35 parts by weight, these tendencies are remarkable and neither is preferable.

The grain size of the barley stone powder is 0.1 to 20.
00 μm is preferably used. As the particle size becomes smaller than 0.1 μm, the load and the number of man-hours for pulverizing barley stone tend to increase and the adsorbing action for barley stone tends to decrease.
As it becomes larger than 2000 μm, it tends to be difficult to be held by the inorganic foam and easily fall off. In particular, when the particle size is smaller than 0.1 μm or larger than 2000 μm, these tendencies are remarkable, and thus both are not preferable.

Since the inorganic waste material is the same as that described in claim 1, its description is omitted.

In the method for producing an inorganic foam according to claim 3 of the present invention, (b) an alkali metal or an alkali is added to 100 parts by weight of an inorganic powder obtained by pulverizing an inorganic waste material. Carbonates or hydroxides of earth metals, metal carbides selected from silicon carbide, titanium carbide, boron carbide, tungsten carbide, zirconium carbide, metal nitrides selected from silicon nitride, titanium nitride, boron nitride, aluminum nitride 0.1 to 5 parts by weight of one or more foaming agents, and (c) barley stone powder 1 obtained by pulverizing barley stone
35 parts by weight, preferably 2 to 30 parts by weight, to prepare a barley stone-containing powder preparation step for preparing a barley stone-containing powder, and the barley stone-containing powder obtained in the barite stone-containing powder preparation step And a foaming step of foaming by heating and melting. With this configuration, the following effects can be obtained. (1) Since the inorganic powder in which the barley stone powder is mixed is heated and melted and foamed by the foaming agent, bubbles are formed in the molten inorganic powder to be porous and the surface area is increased. Since the barley stone powder is dispersed and held three-dimensionally, water and air can be efficiently purified by the strong adsorption force of the barley stone. Further, since the barley stone powder is dispersed in the system, the bulk becomes large, and it is possible to manufacture an inorganic foam that can obtain the infrared ray radiating action and the like of barite stone with a small amount of barite stone. (2) Since a porous body having a large surface area, in which fine-grained barley stone powder is three-dimensionally held, is formed, the probability of contacting the water with the barley stone increases when the water comes into contact with the porous body. The mineral elution effect and the water activation effect can be efficiently exhibited.

Here, in the step of preparing the powder containing barley stone, the inorganic waste material, barley stone and, if necessary, the foaming agent are added to the hammer mill, edge runner, screen mill, roller mill, erofol mill, ball mill, jet mill and the like. This is a step of mixing a predetermined amount of the inorganic powder, the barley stone powder, and the foaming agent obtained by pulverizing with a pulverizer. In addition, inorganic waste materials,
The blowing agent, the mixing amount of the blowing agent and the barley stone powder with respect to the inorganic powder, the particle diameters of the inorganic powder and the barite stone powder, and the average particle diameter of the blowing agent are the same as those described in claim 2. Since it is a thing, the description is omitted. In addition, like the one described in claim 2,
Instead of the foaming agent or in addition to the foaming agent, shell powder can be added and mixed. As the content of the foaming agent and / or shell powder, the total amount of the foaming agent and shell powder is 0.1 to 30 with respect to 100 parts by weight of the inorganic powder, as in the case of claim 2.
Weight parts are preferred. The effect of adding shell powder is
The description is omitted because it is the same as that described in claim 2.
A granulation step of forming a granulated powder by granulating an inorganic powder, a foaming agent, or the like may be added after the powder molding step containing the boiled stone. As a result, it is possible to prevent the fine inorganic powder or the like from agglomerating, etc., and improve the moldability of the molded product in the foaming step, which is excellent in workability and the product yield.

In the foaming step, powder containing barley stone is filled in a mold made of stainless steel or is deposited on a mesh belt or caterpillar made of stainless steel.
Alternatively, a molded body formed by molding with a mold or the like is placed in a box furnace,
A shuttle furnace, a roller hearth kiln, a tunnel furnace, or the like that heats intermittently or continuously in a heating furnace to melt the inorganic powder is used. In the foaming step, the melted and softened inorganic powder is foamed by carbon dioxide gas or nitrogen gas generated by decomposition of the foaming agent or shell powder, so that bubbles are formed in the inorganic foam.

The heating temperature in the foaming step depends on the type of the inorganic powder, the foaming agent, etc., but it is 750 to 1100.
C., preferably 900 to 1000.degree. C. is suitably used.
As the heating temperature becomes lower than 900 ° C., the softening of the inorganic powder is insufficient and the foaming agent is hard to be wrapped with the inorganic powder, so that the foaming agent tends to be difficult to foam even when decomposed.
As the temperature rises above 0 ° C, bubbles generated by decomposition of the foaming agent expand and coarsen, making it difficult to obtain fine bubbles, and foamed substances tend to remelt and become smooth glassy. . Especially below 750 ℃ 110
When the temperature is higher than 0 ° C., these tendencies become remarkable, and thus both are not preferable. In the foaming process, 750 to 1100
It is held at a heating temperature of ° C for 5 to 20 minutes depending on the thickness and size of the molded body. As the holding time becomes shorter than 5 minutes, unevenness of foaming tends to occur and the sizes of the bubbles tend to be significantly uneven, and as the holding time becomes longer than 20 minutes, the bubbles tend to expand and become coarse. Absent. Also, depending on the thickness and size of the molded body, heat transfer unevenness may occur and an inhomogeneous inorganic foam may be formed.In order to prevent this, the molded body should have a predetermined thickness according to the size of the heating furnace. Formed in a pod size.

Particularly preferably, the temperature is set to (1) 600 to 750 ° C. and (2) 850 to 9 in a long tunnel type heating furnace.
50 ° C, (3) 950 to 1000 ° C, (4) 900 to 9
What is divided into a plurality of zones previously held at a temperature of 50 ° C., and the mixed powder is conveyed and heated and melted so as to pass through each zone in order for 5 to 20 minutes is used. Since the mixed powder is conveyed through the area that is held at a predetermined temperature in advance,
Excellent productivity with continuous production. Also, 600 to 75
Since it is preheated at 0 ° C and then heated to 850 ° C or higher,
The melting of the inorganic powder and the decomposition / foaming of the foaming agent can be reliably performed, and the product yield can be increased. Further, after that, since the product is heated to 900 to 950 ° C., it is possible to prevent the product from being cracked, obtain the mechanical strength as designed, and improve the product yield.

The molten foam obtained in the foaming step is slowly cooled in a heating furnace, naturally cooled in air, or rapidly cooled with air, water or the like to obtain a long or lumpy inorganic foam. Formed and optionally crushed or cut or cracked. The inorganic foam can be used, for example, as a civil engineering material used for embankment, backfilling, backfilling, etc., a lightweight aggregate such as concrete or asphalt, a heat insulating material, a construction material such as a soundproofing material. In particular, when it is used as a heat insulating material used under the floor of a house or in the attic, it is suitably used because the large surface area and barley stone impart heat insulating properties as well as deodorizing properties and dehumidifying properties. In addition, as a filtering material, purifying material, deodorizing material, dehumidifying material, etc. that uses a large surface area and the adsorptivity of barley stone, the water absorption due to the large number of bubbles and the mineral elution effect of barley stone were used. It is also suitably used as a soil improving material to be mixed with soil for slope greening and roof gardens.

In the method for producing an inorganic foam according to claim 4, (a) an inorganic powder 1 obtained by pulverizing an inorganic waste material
(B) a metal carbide selected from alkali metal or alkaline earth metal carbonates or hydroxides, silicon carbide, titanium carbide, boron carbide, tungsten carbide, zirconium carbide, silicon nitride, and titanium nitride per 100 parts by weight. 0.1 to 30 parts by weight of one or more foaming agents selected from metal nitrides selected from boron nitride and aluminum nitride,
Inorganic mixed powder creating step of mixing to create an inorganic mixed powder, while forming a melt by heating and melting the inorganic mixed powder obtained in the inorganic mixed powder creating step, From the start of heating of the inorganic mixed powder to the cooling and solidification of the melt, barley stone powder obtained by pulverizing barley stone with respect to the inorganic powder is 1 to 35 parts by weight, preferably 2 .About.30 parts by weight is spread on the surface of the inorganic mixed powder or the melt, and a bourhanite powder spraying step is provided. With this configuration, the following effects can be obtained. (1) Since the inorganic powder is melted by heating to form a melt and is foamed by the foaming agent, and the barley stone powder is sprayed on the surface,
Since the surface of the barley stone powder is exposed while the surface of the barley stone is exposed on the surface of the inorganic foam, the surface area of the barley stone that can come into contact with water, air, etc. is large, and thus the strong adsorption effect of barley stone,
The mineral elution effect and the water activation effect can be efficiently expressed. (2) Since the barley stone powder can be held only on a specific surface of the melted material to which the barley stone powder is dispersed,
When used as a purifying agent, deodorizing agent, dehumidifying agent, etc., the barley stone powder can be densely packed only on a specific surface that comes into contact with water, air, etc., and high adsorption efficiency of barley stone is achieved. It is possible to form a filtering material, a purifying material, a deodorizing material, a dehumidifying material, and the like.

In the step of spraying the barley stone powder, an inorganic mixed powder containing an inorganic powder and a foaming agent is filled in a mold made of stainless steel or a mesh belt or caterpillar made of stainless steel or the like. Inorganic materials are formed by depositing them on a mold, etc., or by molding with a mold, and heating them intermittently or continuously in a heating furnace such as a box furnace, shuttle kiln, roller hearth kiln, or tunnel type. A mixed powder (molded body) is melted to obtain a molten body,
Between the start of heating the molded body and the cooling and solidification of the melt, the barley stone powder is sprinkled on the surface of the molded body or the melt. In particular, roller hearth kilns, tunnel furnaces, etc. that can deposit inorganic mixed powders (molded bodies) on stainless steel mesh belts, caterpillars, etc. and melt them continuously, from the start of heating to solidification by cooling. This is preferably used because the fine powdered barley stone powder can be easily held on the upper surface of the melt by spraying the barley stone powder on the upper surface of the molded body or the melt, and the facility load is small.

The amount of the barley stone powder applied in the barley stone powder dispersion step is 1 to 100 parts by weight of the inorganic powder.
35 parts by weight, preferably 2 to 30 parts by weight are suitably used. As the amount of the barley stone powder applied was less than 2 parts by weight, the adsorption power of the barley stone decreased, and the deodorizing action and purification action tended to decrease. Due to the difference between the expansion coefficient and the thermal expansion coefficient of the inorganic foam, the adhesive strength of the barley stone powder to the inorganic foam is reduced, and the barite stone powder tends to fall off from the inorganic foam. . In particular, if the amount of the barley stone powder applied is less than 1 part by weight or more than 35 parts by weight, these tendencies become remarkable, which is not preferable.

The inorganic waste material and the foaming agent are the same as those described in claim 2, and the inorganic mixed powder preparation step is the same as the barley stone-containing powder preparation step described in claim 3. Since the heating temperature in the barley stone powder spraying step is the same as the heating temperature in the foaming step described in claim 3, description thereof will be omitted. Further, in the inorganic powder mixing and producing step, the shell powder can be added and mixed in the same manner as described in claim 3. Since the action of the shell powder has been described in claim 2, the description is omitted. Also,
As described in claim 3, a granulating step can be added after the inorganic mixed powder forming step.

The invention according to claim 5 is the invention according to claim 3 or 4.
The method for producing an inorganic foam according to item 1, wherein the particle size of the inorganic powder is 0.01 to 3000 μm, preferably 0.1.
It has a configuration of 1 to 1000 μm. With this configuration, the following action is obtained in addition to the action obtained in claim 3 or 4. (1) Since the particle size of the inorganic powder is adjusted within a predetermined range, the melting temperature of the inorganic powder is stable, the size of the bubbles is also stable, and the stability of the quality of the inorganic foam is excellent. .

Here, since the particle size of the inorganic powder is the same as that described in claim 2, the description is omitted. Inorganic powders include dry classifiers such as gravity classifiers, inertia classifiers, centrifugal classifiers, and sieving machines, as well as Spitzkasten,
It is preferable to classify into a predetermined particle size by a gravity type wet classifier such as a spiral classifier or a centrifugal force type wet classifier such as a hydrocyclone, because the particle size can be reliably adjusted to a predetermined range. When a wet classifier is used, the temperature is raised after drying or after completely evaporating water or the like at about 200 ° C. when heating in a heating furnace. This is to prevent water and the like in the molded body from expanding in the heating furnace and collapsing the molded body.

The invention according to claim 6 of the present invention is the method for producing an inorganic foam according to any one of claims 3 to 5, wherein the grain size of the barley stone powder is 0. .1 to 200
It has a structure of 0 μm. With this configuration, in addition to the operation obtained in any one of claims 3 to 5, the following operation is obtained. (1) Since the particle size of the barley stone powder is adjusted within a predetermined range, the surface area of the barley stone powder can be adjusted, and the adsorption effect, the mineral elution effect, the water activation effect, etc. possessed by the barley stone can be adjusted. It is obtained stably, and the quality of the inorganic foam is excellent in stability.

Here, since the grain size of the barley stone powder is the same as that described in claim 2, the description is omitted. The barley stone powder can be classified in the same manner as the inorganic powder described in claim 5.

[0037]

EXAMPLES The present invention will be specifically described below with reference to examples. The present invention is not limited to these examples. (Example 1) A glassy waste material such as a glass bottle and a window glass as an inorganic waste material was roughly crushed to an average particle diameter of 2 to 3 mm by using a crusher such as an edge runner. Then, it was finely pulverized using a pulverizer such as an Elofol mill. Next, the particles were classified by a classifier using a 20-mesh standard sieve (opening 850 μm) to obtain an inorganic powder having a particle size of 850 μm or less. Next, granular Chinese barley stone with a particle size of 5 to 10 mm is finely pulverized using a crusher such as an Elofol mill, and then classified using a classifying device such as a vibrating sieve to obtain a particle size of 2000 μm. The following barley stone powder was obtained. In the manufacturing process of powder containing barley stone, pulverized and classified inorganic powder 1
00 parts by weight, 28 parts by weight of barley stone powder, and silicon carbide as a foaming agent (average particle size 3.9 μm, product name C-4000
F, manufactured by Yakushima Electric Co., Ltd.) and 1.0 part by weight were thoroughly mixed with a mixer such as a stirrer to obtain a barley stone-containing powder. In the foaming step, a tunnel type heating furnace was used in which a mesh belt made of stainless steel or the like and having a width of 1.5 m was stretched over a length of 25 m. The mesh belt has a first zone of 600 to 750 ° C., a second zone of 850 ° C. and a third zone of 9.
40 ° C, 4th zone 960 ° C, 5th and 6th zone 940 ° C
It is set so as to pass through each zone in the heating furnace kept at 5 to 10 minutes. On the mesh belt, the obtained powder containing barley stone is about 10 mm in thickness and about 100 in width.
cm to continuously accumulate along the longitudinal direction of the mesh belt to form a molded body, which is melt-foamed in a heating furnace to have a thickness of about 20 m.
A m-shaped inorganic foam of Example 1 was obtained.

Example 2 100 parts by weight of an inorganic powder obtained in the same manner as in Example 1 and silicon carbide as a foaming agent (average particle size 3.9 μm, product name C-4000F, manufactured by Yakushima Electric Works) ) 0.5 parts by weight and 10 parts by weight of shell powder having a particle size of 0.01 to 3000 μm obtained by crushing oyster shells are thoroughly mixed with a mixer such as a stirrer to mix inorganic powder. Got the body The obtained inorganic mixed powder was placed on a mesh belt of a heating furnace similar to that of Example 1 to have a thickness of about 10 mm and a width of about 100 c.
m was continuously deposited along the longitudinal direction of the mesh belt to form a molded body, which was passed through the first to fourth zones of the heating furnace and melt-foamed to form a molten body. Then, the boundary of the fourth zone and the fifth zone of the heating furnace was adjusted so that the weight of the barley stone powder obtained in the same manner as in Example 1 was 8 parts by weight with respect to 100 parts by weight of the inorganic powder. Was uniformly dispersed in the width direction of the surface of the melt from the barley stone powder spraying hole formed above the mesh belt. The melt with the bakuhanishi powder sprinkled on the surface passes through the fifth to sixth zones of the heating furnace and has a thickness of about 2
A 0 mm plate-like inorganic foam of Example 2 was obtained.

Comparative Example 1 An inorganic foamed product of Comparative Example 1 containing no barley stone powder was obtained in the same manner as in Example 1 except that the barley stone powder was not mixed with the inorganic powder.

(Evaluation of infrared radiation characteristics of inorganic foam)
Infrared radiation characteristics of the inorganic foam of Example 1 were evaluated.
A radiation characteristic measuring apparatus (manufactured by JASCO Corporation, EM-101) was used as the measuring apparatus, and 3 at 100 ° C. for each of the inorganic foamed body of Example 1 and the simple substance Imaiishi.
Emissivity was measured at wavelengths of ~ 30 μm. As a result, it was confirmed that the inorganic foam of Example 1 had a very high emissivity of 0.85 to 0.90 at a wavelength of 4 to 24 μm. This was almost the same as the emissivity of bakuhanishi alone. As described above, according to the inorganic foam of the present example, it was revealed that a small amount of bakuhanishi can provide a high emissivity equivalent to that of bakuhanishi alone. By this, a small amount of barley stone powder is dispersed and supported in the inorganic foam to increase the bulk, and it is possible to produce an inorganic foam having a high far-infrared radiation effect equivalent to that of barley stone alone, which is expensive barley rice. It was revealed that the amount of stones can be increased to increase the surface area and enhance the action of barite stones.

(Evaluation of Deodorizing Property etc. of Inorganic Foam) When the specific gravity of the inorganic foams of Examples 1 and 2 was measured,
All were 0.3. When the fracture surface was observed, it was confirmed that bubbles having an inner diameter of 0.1 to 2 mm were uniformly distributed. Next, the inorganic foams of Example 1, Example 2, and Comparative Example 1 were each 200 mm long, 200 mm wide, and about 20 m thick.
After cutting into a size of m, the inorganic foam was sealed together with a hygrometer in a container with a lid having a capacity of 20 L into which 7 ppm of ammonia gas was introduced. The humidity in the container immediately after sealing was 65%. The humidity in the container after 2 hours from the sealing was 51% in Example 1 and 50% in Example 2.
Comparative Example 1 was 64%. Further, when the lid of the container was opened, the smell of ammonia was sensed in Comparative Example 1, whereas the smell of ammonia was not sensed in Examples 1 and 2. As is clear from the above results, the inorganic foam of the present invention contains an appropriate amount of barley stone,
It has been confirmed that it has excellent dehumidifying and deodorizing properties, and is optimal as a filtering material for water and air, a purifying material, a deodorizing material, and a dehumidifying material. In addition, it was confirmed that it is optimal as a lightweight civil engineering and construction material because fine air bubbles are uniformly dispersed. In addition, a small amount of barley stone powder is dispersed in an inorganic foam to increase the bulk by supporting it, and it is possible to produce an inorganic foam having a high far-infrared radiation effect equivalent to that of barley stone alone, which is expensive barley stone. It was clarified that the amount of B. can be increased to increase the surface area by increasing the amount of B. In addition,
Inorganic powder, foaming agent, barley stone powder content, particle size, etc.
The same evaluation was carried out by changing the content within a predetermined range, and it was confirmed that all of them were excellent in dehumidifying property, deodorizing property and the like as in this example.

[0042]

As described above, the inorganic foam of the present invention,
According to the inorganic foam composition and the method for producing the inorganic foam, the following advantageous effects are obtained. According to the invention of claim 1, (1) it is possible to adsorb and remove heavy metals such as chlorine and cadmium dissolved in water, various bacteria and the like by the action of silicic acid anhydride and the like of the porous barite stone. It is possible to provide an inorganic foam that is excellent in cleanability and deodorizing property by purifying water in the air. (2) Since it contains barley stone, it has an infrared radiation effect and can be used as a heating medium for heating equipment, drying equipment, etc., and also effective for activating and sterilizing water, promoting plant growth, etc. It is possible to provide an inorganic foam having excellent infrared radiation.

According to the invention described in claim 2, (1) since it contains an appropriate amount of the inorganic powder, the foaming agent and the barley stone powder, the action of the barley stone such as the adsorbability and the like It is possible to optimize the balance of the bubble distribution and the mechanical strength of the inorganic foam that retains water, as a lightweight civil engineering and construction material, or as a water or air filter material, a purification material,
It is possible to provide an inorganic foam composition which is optimal as a deodorizing material, a dehumidifying material, etc., or as a soil improving material, etc. and has excellent applicability. (2) Since it contains an appropriate amount of barley stone powder, the barley stone powder is dispersed and supported in an inorganic foam to increase the bulk, and the far-infrared radiation effect of barley stone is obtained. To provide an inorganic foam composition which is capable of producing a body and which can increase the surface area by increasing the amount of expensive barley stone by using a small amount to increase the action of barley stone and which is remarkably excellent in the bulking action. You can

According to the invention of claim 3, (1) since the inorganic powder mixed with the barley stone powder is melted by heating and foamed by the foaming agent, bubbles are formed in the molten inorganic powder. Since it is made porous and the surface area is increased, and the barley stone powder is dispersed and held three-dimensionally in it, water and air can be efficiently purified by the strong adsorption force of barley stone. . Further, since the barley stone powder is dispersed in the system, the bulk becomes large, and a method for producing an inorganic foam, which can obtain an inorganic foam having infrared radiation effect of barite stone with a small amount of barite stone, can be obtained. Can be provided. (2) Since a porous body having a large surface area, in which fine-grained barley stone powder is three-dimensionally held, is formed, the probability of contacting the water with the barley stone increases when the water comes into contact with the porous body. It is possible to provide a method for producing an inorganic foam that can obtain an inorganic foam capable of efficiently exhibiting a mineral elution effect and a water activation effect.

According to the invention described in claim 4, (1) since the inorganic powder is heated and melted to form a molten material, which is foamed by the foaming agent, and the barley stone powder is sprayed on the surface,
Since the surface of the barley stone powder is exposed while the surface of the barley stone is exposed on the surface of the inorganic foam, the surface area of the barley stone that can come into contact with water, air, etc. is large, and thus the strong adsorption effect of barley stone,
It is possible to provide a method for producing an inorganic foam capable of efficiently producing a mineral elution effect, a water activation effect, and the like. (2) Since the barley stone powder can be held only on a specific surface of the melted material to which the barley stone powder is dispersed,
When used as a purifying agent, deodorizing agent, dehumidifying agent, etc., the barley stone powder can be densely packed only on a specific surface that comes into contact with water, air, etc., and high adsorption efficiency of barley stone is achieved. It is possible to provide a method for producing an inorganic foam capable of forming a filtering material, a purifying material, a deodorizing material, a dehumidifying material, and the like.

According to the invention of claim 5, claim 3
Or (4) the particle size of the inorganic powder is adjusted within a predetermined range, so that the melting temperature of the inorganic powder is stable and the size of the bubbles is also stable, and the inorganic foam is It is possible to provide a method for producing an inorganic foam having excellent stability of quality.

According to the invention of claim 6, claim 3
In addition to the effect of any one of 5 to 5, (1) since the particle size of the barley stone powder is adjusted within a predetermined range, the surface area of the barley stone powder can be adjusted, and the adsorption of the barite stone It is possible to provide a method for producing an inorganic foam that is stable in the effect, mineral elution effect, water activation effect, and the like, and is excellent in the stability of the quality of the inorganic foam.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiki Yamane             200-2 Miyaya, Gunya-cho, Yazu-gun, Tottori Prefecture             Construction Co., Ltd. (72) Inventor Shiro Hisatomi             1-3-1-21 Tokiwadai, Ube City, Yamaguchi Prefecture (72) Inventor Hiroaki Watanabe             Equity prefecture Niihama city Kubotacho 3-9-20 shares             Within the company Eco City (72) Inventor Naoki Mori             25, Engyoji Temple, Kochi City, Kochi Prefecture             Within F-term (reference) 4G019 FA02                 4G030 AA45 AA46 AA47 AA49 AA50                       AA51 AA52 CA09 GA01 HA25

Claims (6)

[Claims] 1. An inorganic foam, which is obtained by calcining an inorganic powder containing barley stone powder obtained by pulverizing barley stone. 2. (a) 100 parts by weight of an inorganic powder obtained by pulverizing an inorganic waste material, and (b) an alkali metal or alkaline earth metal carbonate with respect to 100 parts by weight of the inorganic powder. Or a metal carbide selected from hydroxide, silicon carbide, titanium carbide, boron carbide, tungsten carbide, zirconium carbide, and a metal nitride selected from silicon nitride, titanium nitride, boron nitride, and aluminum nitride, 1 0.1 to 30 parts by weight of a foaming agent of at least one kind, and (c) 1 to 35 parts by weight, preferably 2 to 30 parts by weight of barley stone powder obtained by pulverizing barley stone. A characteristic inorganic foam composition. 3. (a) 100 parts by weight of an inorganic powder obtained by pulverizing an inorganic waste material, (b) an alkali metal or alkaline earth metal carbonate or hydroxide, silicon carbide,
At least one foaming agent selected from the group consisting of metal carbides selected from titanium carbide, boron carbide, tungsten carbide and zirconium carbide, metal nitrides selected from silicon nitride, titanium nitride, boron nitride and aluminum nitride 0.1 ~ 30
Part by weight, and (c) barley stone powder obtained by crushing barley stone 1 to 35 parts by weight, preferably 2 to 30 parts by weight, to prepare barley stone containing powder to prepare barley stone containing powder Process,
A foaming step of heating and melting the boiled stone-containing powder obtained in the boiled stone-containing powder forming step to expand the powder, the method for producing an inorganic foam. 4. (a) 100 parts by weight of inorganic powder obtained by pulverizing an inorganic waste material, (b) alkali metal or alkaline earth metal carbonate or hydroxide, silicon carbide,
At least one foaming agent selected from the group consisting of metal carbides selected from titanium carbide, boron carbide, tungsten carbide and zirconium carbide, metal nitrides selected from silicon nitride, titanium nitride, boron nitride and aluminum nitride 0.1 ~ 30
By weight, and an inorganic mixed powder making step of making an inorganic mixed powder, and the inorganic mixed powder obtained in the inorganic mixed powder making step is heated and melted to form a melt. 1-35 weight of barley stone powder obtained by pulverizing barley stone with respect to the inorganic powder during the period from the start of heating the inorganic mixed powder to the solidification by cooling the melt while forming Part, preferably 2 to 30 parts by weight, and a step of spraying barley stone powder on the surface of the inorganic mixed powder or the melt,
A method for producing an inorganic foam, comprising: 5. The particle size of the inorganic powder is 0.01 to 3
The method for producing an inorganic foam according to claim 3 or 4, wherein the thickness is 000 µm, preferably 0.1 to 1000 µm. 6. The grain size of the barley stone powder is 0.1 to 20.
It is 00 micrometers, The manufacturing method of the inorganic type foam of any one of Claim 3 thru | or 5 characterized by the above-mentioned.