JPH09188571A - Prepared unshaped refractory containing carbon for bonding to resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a prepared unshaped refractory containing a carbon such as a scaly graphite having large effect on improvement of spalling resistance and strength and excellent in corrosion resistance. SOLUTION: This prepared unshaped refractory containing a carbon for bonding to a resin comprises 100 pts.wt. refractory powder part composed of a pellet and a refractory material and 3-15 pts.wt. resin liquid part. The pellet is composed of a pellet (A) having single dimension and 5-15 mm maximum dimension and obtained by adding a binder to a mixture of a scaly graphite with a refractory aggregate and forming the mixture under pressure and a pellet (B) having one kind or two kinds of single dimensions of at least two or more times based on the maximum dimension of the pellet (A) and having <=100mm maximum dimension, and a weight ratio of the pellet (A) to the pellet (B) is (1:4) to (4:1) and total amount of the pellet is within the range of 60-85wt.% based on the refractory powder part.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a blast furnace gutter, a tow truck,
Amorphous refractory containing resin-bonded carbon used for lining and lining of molten iron and molten steel containers for iron making such as ladle, converter, electric furnace, degasser, tundish, and other high temperature furnaces. Regarding things.

[0002]

2. Description of the Related Art Conventionally, in the field of refractory bricks, bricks containing carbon, especially refractory materials using scaly graphite,
Since it suppresses the wetting of slag components and has excellent spalling resistance, it is widely used in applications such as refining furnaces where erosion is severe. In general, a binder that forms carbon by heating is used for a refractory containing scaly graphite.

On the other hand, in the field of amorphous refractories as well, carbon-containing refractories using various resins as binders have been developed, but they have not reached wide market.

Further, JP-A-57-92581 discloses a basic castable using magnesia and graphite and using a condensed sodium phosphate binder as a binder and high alumina cement, and 5 to graphite
It is also shown that the corrosion resistance is improved by adding 3%. However, when water is added to the compounded mixture and kneaded, it is difficult for the graphite to be wetted by water, and when graphite having a flat shape like scaly graphite is used, the dispersibility is poor and the movement of the material is disturbed. As a result, the workability of construction is significantly reduced. For this reason, it is practically necessary to increase the amount of added water, and as a result, only a construction body having a low packing density can be obtained. In such a construction body having a low packing density and a large porosity, the graphite is often not fully utilized, such that the graphite is oxidized in the heating step and the corrosion resistance is rather lowered.

Further, as a conventional technique relating to a carbon-containing amorphous refractory using pellets, for example, Japanese Patent Laid-Open No. 3-15
No. 0272 discloses that 10-80% by weight of scaly graphite and the balance of a refractory aggregate as a main material, and a mixture obtained by adding a binder thereto is molded into a particle size of 10 to 60 mm with a briquette machine and then heat-treated. Disclosed is a method for producing a refractory for casting with basic properties, characterized in that the pressure-granulated product obtained in this manner is blended in an amount of 10 to 60% by weight based on the whole aggregate.
It is said that the pressurized granulated product has a low porosity, is excellent in oxidation resistance, and has a small friction on the surface of the granulated product, so that the amount of applied water can be reduced. The basic pouring material obtained by this method is said to have solved the problem of cracking due to thermal expansion stress. However, since the casting material is also constructed using water, it is the same that the pressurized granules containing scaly graphite are difficult to wet with water, and the granules have a smooth surface so that they bond with the surroundings. Only weak and strong construction products can be obtained. In addition, when used in an actual furnace, the granules exposed on the working surface easily fall off, causing rapid damage, which makes practical use difficult. In any case, it should be considered that there are major problems in constructing or molding a carbon-containing material using water and a binder that requires water.

On the other hand, Japanese Patent Laid-Open No. 287072/1994 discloses a resin-bonded carbon-containing amorphous refractory composed of a refractory powder part and a resin liquid part, wherein the refractory powder part is composed of pellets and a refractory material. Porosity 3 to 12 in which the pellets are pressure-molded using a resin of the same type as the resin liquid part as a binder in a mixture of at least 5% by weight of scaly graphite and / or carbonaceous fibers and the remainder being a refractory material. %, And the weight ratio of (total carbon amount of pellets) / (total carbon amount of refractory powder part) is 0.5 or more. It is disclosed. According to the publication, the resin is more compatible with scaly graphite than water, and the binding force between the pellet and the surrounding matrix is sufficient, and it is possible to form a stable connective structure with excellent filling properties.

[0007]

The carbon-containing amorphous refractory as described above has been improved in terms of filling property and bondability, but it is far from bricks of the same material formed by a high pressure press. The current situation is that there are none. Therefore, the amorphous refractory is extremely inferior to brick in terms of corrosion resistance, and it has been difficult to put it into practical use.

Accordingly, an object of the present invention is to provide an amorphous refractory material containing carbon such as scaly graphite which is highly effective in improving spalling resistance and strength characteristics and which is excellent in corrosion resistance.

[0009]

That is, the resin-bonded carbon-containing amorphous refractory material of the present invention comprises 100 parts by weight of a refractory powder part made of pellets and refractory material, and 3 to 15 parts by weight of a resin liquid part. In resin-bonded carbon-containing amorphous refractory,
The pellets are single-sized pellets (A) having a maximum size of 5 to 15 mm, which are obtained by adding a binder to a mixture of scaly graphite and a refractory aggregate and press-forming the pellets, and pellets (A) At least twice the maximum dimension of 100m
It consists of one or two single-sized pellets (B) with a maximum size of m or less, and is composed of pellets (A): pellets (B) in a weight ratio of 1: 4 to 4: 1. Moreover, the total amount of the pellets is in the range of 60 to 85% by weight of the refractory powder portion.

In addition, in the resin-bonded carbon-containing amorphous refractory material of the present invention, two types of pellets, a pellet (B) having a smaller maximum size (B ₁ ) and a larger maximum size pellet (B ₂ ) are used. When configured, it is preferred that the maximum dimension of the pellet (B ₂ ) is at least twice the maximum dimension of the pellet (B ₁ ).

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the resin-bonded carbon-containing amorphous refractory material of the present invention (hereinafter, simply referred to as "amorphous refractory material"), ensuring the wettability of the carbonaceous material and the binder ensures stable bonding. Considering that this is a necessary condition for obtaining the structure, the resin liquid portion is used as the liquid component that gives the binder and the moldability. The resin liquid part used for the amorphous refractory material of the present invention is required to have a carbon residue ratio as high as possible in order to form a carbon bond after heating, similarly to the characteristics required for the conventional carbon-containing refractory material. In addition, it must have good wettability with respect to the carbonaceous material. In this respect, phenolic resin,
A furan resin, an epoxy resin, a melamine resin, a urea resin, a resorcinol resin, a polymer of furifuryl alcohol, or the like can be used. Among them, a phenol resin is most preferable, and both a resol type and a novolak type can be preferably used.

For the resin liquid part, it is preferable to use a liquid whose viscosity is adjusted to an optimum value according to the method of construction of the irregular refractory material. For example, in cast molding, a resin having a viscosity as low as possible is easy to apply in order to improve fluidity, and the viscosity of the resin liquid portion is preferably 100 centipoise or less at 20 ° C., while in stamp molding, it is appropriate. The higher the viscosity is, the easier the construction is, and the viscosity of the resin liquid portion is preferably about 50 centipoise or more at 20 ° C. In any case,
The viscosity of the resin liquid part can be adjusted by changing the type and addition amount of the solvent of the resin. As the solvent, generally known alcohols, glycols and the like can be used. However, it should be noted here that when the amount of the solvent added is excessively increased to adjust the viscosity, the solvent volatilizes by heating,
Since it burns, the amount of residual carbon after heating decreases, leading to a decrease in bond strength. Therefore, it is preferable that the concentration of the resin component in the resin liquid portion is at least 35% by weight or more.

When it is necessary to cure the resin at room temperature after construction depending on the conditions of use, it is necessary to add a curing agent for curing the resin at room temperature. Hardeners include
It is possible to use acidic substances such as paratoluenesulfonic acid, benzenesulfonic acid, xylenesulfonic acid, sulfamic acid, oxycarboxylic acid, amino acids, and various esters. These hardeners are added to or mixed with the refractory powder part depending on their properties, that is, whether they are powder, liquid, direct reaction with resin, secondary reaction, etc. It can be used by deciding whether to mix in parts.

Further, in the case of being applied at a temperature of about 100 to 200 ° C. or being heat-cured after the application, a thermosetting type resin such as a resole type phenol resin is used or a thermoplastic resin is used. A curing agent that imparts thermosetting property to the novolac type phenolic resin, such as hexamine, may be added. Further, when applying at a high temperature, it is possible to use only a thermoplastic resin without adding a curing agent.

The mixing ratio of the resin liquid part is within the range of 3 to 15 parts by weight with respect to 100 parts by weight of the refractory powder part described later. If the mixing ratio of the resin liquid part is less than 5 parts by weight, the moldability is insufficient even in a construction method such as stamp construction, and the filling property is lowered, which makes it difficult to obtain a dense construction body, which is not preferable. Further, if the blending ratio exceeds 15 parts by weight, the porosity after heating remarkably increases, and the strength and corrosion resistance decrease, which is not preferable.

In the irregular refractory material of the present invention, pellets are used, which are composed mainly of scaly graphite and refractory aggregate in the refractory powder part, and a binder is added to this to form a compact.

As described above, when the resin liquid portion which is easily wetted by carbon is used as the binder, the bondability between the binder and the carbonaceous material is improved, but the workability as an amorphous refractory is not improved by itself. Hardly improved. Since scaly graphite has a larger surface area than granular materials such as refractory materials, it requires a large amount of liquid to cover the surface of the particles. Also,
Since the shape is flat or fibrous, it is difficult to knead with an ordinary mixer and difficult to uniformly disperse, and the movement of material particles is obstructed even at the time of construction to reduce the filling property. Therefore, in the amorphous refractory of the present invention, scaly graphite which is a cause of reducing such workability,
It is used as a shape that can be handled as a granular material by molding it with a refractory raw material into pellets.

The scaly graphite blended in the pellets used for the amorphous refractory material of the present invention is preferably in the range of 5 to 35% by weight. When the addition amount of the scaly graphite is less than 5% by weight, it is not necessary to pelletize the scaly graphite together with the refractory raw material for use. Unless the pellet contains at least 5% by weight or more of scaly graphite, the effect of the present invention is not apparent. Further, if the addition amount of the scaly graphite exceeds 35% by weight, when heated, the disappearance of the graphite due to oxidation becomes more intense, the porosity increases, and the slag resistance decreases, and the expected effect is obtained. It is not preferable because it can not be done.

In addition to the scaly graphite, the pellets are
As the carbonaceous material, carbon such as artificial graphite, coke, and carbon black, or a material that forms carbon by heating such as resin powder or pitch powder can be used together. When blending these carbonaceous materials, the blending amount is preferably 10% by weight or less. If the blending amount of the carbonaceous material exceeds 10% by weight, the slag resistance and the oxidation resistance are deteriorated and the corrosion resistance is deteriorated, which is not preferable.

The elements other than the scaly graphite and the carbonaceous material constituting the pellet are refractory raw materials. The refractory raw material used for the pellets is not particularly limited, but a refractory raw material having the same quality as the main refractory material constituting the entire amorphous refractory is preferable. For example, in the case of alumina-carbonaceous amorphous refractory, it is preferable that the refractory raw material used in the pellets is also mainly composed of alumina, and in the case of magnesia-carbonaceous amorphous refractory, magnesia is used. Mainly one is preferable. In order to stabilize the bond strength between the pellets and the refractory raw materials other than the pellets of the refractory powder part, in consideration of the difference in the characteristics of the two, it is necessary to use them at high temperatures without unnecessary strain. It is preferable to consider so as not to cause the above. The amount of refractory raw material blended into the pellets is 65
Within the range of up to 95% by weight.

The binder used for molding the pellets is not particularly limited. In order to maintain a stable bond for the entire construction body during heating and heating and use at high temperature, pellets are molded using the same resin as the resin liquid part that bonds the entire amorphous refractory as the binder. That is an effective means. However, since the amorphous refractory material of the present invention contains a large amount of pellets, the quality of the pellets itself is an important factor that determines the quality of the entire construction body. Therefore, when the quality of the pellet itself is deteriorated by using the same kind of resin as the binder, the quality of the entire construction may be deteriorated. Assuming such a case, it is possible to use the optimum binder for the quality of the pellet itself, regardless of the kind of the binder that bonds the entire irregular-shaped refractory.

The blending amount of the binder is the above-mentioned scaly graphite,
It is in the range of 2.5 to 8 parts by weight on the basis of 100 parts by weight of the total amount of the refractory raw material, and optionally the carbonaceous material. When the compounding amount of the binder is less than 2.5 parts by weight, the scaly graphite is difficult to disperse, kneading becomes difficult, and the moldability is deteriorated, which is not preferable, and when it exceeds 8 parts by weight. It is not preferable because cracks are likely to occur at the time of molding, and the volatile matter is vaporized significantly by heating, resulting in an increase in porosity.

As a result of various studies on a method of forming a mixture obtained by mixing the above-mentioned raw materials into pellets, a mixture containing scaly graphite is homogeneously and densely pelletized unless at least a method of granulating by pressurization. It has proven difficult to mold into. The type of molding machine that can be used depends on the particle size of the materials that make up the pellets, especially the refractory raw material that cannot be deformed, and the required size of the pellets.For example, a single-shot type or compression rotary type tablet granulator. It is preferable to use a briquette granulator, a high pressure extrusion type disc pelleter, or the like.

The granules pressure-molded as described above may be left as they are to harden the binder, or they may be heat-treated at 150 to 300 ° C. for about 1 to 10 hours. The binder can also be cured by.

In the amorphous refractory material of the present invention, it is preferable to use pellets having a porosity of 3 to 12%. The porosity can be set to less than 3% depending on the pellet composition and molding method. Considering the pellet itself, it is judged that the smaller the porosity, the better the corrosion resistance, the higher the strength, and the better. It However, in the entire amorphous refractory,
Pellets behave like grains like other refractory materials. Therefore, if the porosity of individual pellets is too low, the resin liquid part, which is the binder, cannot fully infiltrate the pellets when it is applied to the entire amorphous refractory, resulting in only surface adhesion and a strong bond. Inability to form tissue. On the other hand, when the porosity of the pellets exceeds 12%, the corrosion resistance of the pellets itself may be reduced, and the strength may be insufficient to cause cracks during kneading. In addition, since pellets having a high porosity cover poor filling properties due to addition of scaly graphite, it is meaningless to form pellets. For this reason, the porosity of the pellet is preferably about 3 to 12%, more preferably 3 to 7%.

In the amorphous refractory material of the present invention, as the pellet, a pellet (A) of a single size having a maximum size of 5 to 15 mm is used.
And more than twice the maximum size of the pellet (A), and 100
1 or 2 single size pellets not exceeding mm
(B) is a pellet (A): pellet (B) weight ratio of 1: 4 to
It is characterized in that it is used in a ratio of 4: 1 and the total amount of pellets is used within the range of 60 to 85% by weight of the refractory powder portion.

In the present specification, the "maximum dimension" of a pellet refers to its diameter in the case of a spherical shape, its maximum length in the case of other shapes, and "the single dimension". Indicates that the pellets have the same shape and the same size.

The pressure-molded pellets have basically the same quality as bricks of the same material, and are excellent in corrosion resistance and strength. However, the total amount of pellets contained in the amorphous refractory is 60% of the refractory powder part.
If it is less than wt%, the corrosion resistance of the entire amorphous refractory material is limited by the corrosion resistance of the refractory raw material other than the pellets having a non-dense structure, and the effect of using the pellets is reduced. In order to take full advantage of the high corrosion resistance of the pellets, it is necessary to increase the total amount of the pellets as much as possible and reduce the proportion of the refractory material other than the pellets in the refractory powder portion. Therefore, the proportion of the pellets in the refractory powder portion is preferably 60% by weight or more. Further, when the proportion of the pellets in the refractory powder portion exceeds 85% by weight, the proportion of the fine powder in the refractory powder portion becomes too small, the particle size composition becomes inadequate, and the fluidity decreases. Construction becomes very difficult. Therefore, the ratio of pellets in the refractory powder part is 6
It is in the range of 0 to 85% by weight, and more preferably in the range of 65 to 80% by weight.

In the present invention, as means for increasing the content of pellets, pellets (A) having different maximum dimensions and 1
Or two types of pellets (B) are used in combination.

The smallest pellet (A) has a maximum size in the range of 5 to 15 mm. Maximum dimension is 5m
Pellets having a size of less than m are not preferable because the porosity varies greatly and stable physical properties are difficult to obtain. Further, if the maximum size of the pellet (A) exceeds 15 mm, the maximum size of the pellet (B) becomes too large and it becomes difficult to knead, which is not practical.

The maximum size of one or two types of pellets (B) used in combination with the pellets (A) is the pellet (A).
Is more than twice the maximum dimension of, and at most 100 mm
Shall not be exceeded. If the difference in maximum dimension between the pellets (A) and the pellets (B) is less than twice, the gap between the pellets (B) cannot be filled with the pellets (A), and as a result, one type of pellets was used. Only a filling rate that is almost the same as the case can be obtained. If the difference in maximum dimension between the pellets (A) and the pellets (B) is twice or more, the gaps between the pellets (B) will be filled with the pellets (A), and the filling rate of the pellets will be improved. Basically, the difference between the maximum dimensions of both should be more than twice, but in practice, if the pellets are too large, the kneading property and workability will be deteriorated.
It is preferable that the maximum dimension of (B) does not exceed 100 mm at the maximum. Further, the pellets (B) the largest dimension of the pellets is small (B _1), when composed of 2 kinds of pellet each larger than the maximum dimension of the pellets (B _2), for the same reason as above, the pellet (B ₂ It is preferable that the maximum size of) is at least twice the maximum size of the pellet (B ₁ ).

In the amorphous refractory material of the present invention, the pellet (A) and one or two types of pellets (B) are mixed in a ratio of 1: 4 to.
It is mixed in a weight ratio of 4: 1. Pellets (A) and pellets
The compounding ratio of (B) has a great influence on the packing rate of the pellets. If there is a sufficient difference in the maximum size of the pellets, an appropriate blending ratio will improve the filling rate to some extent. In this case, the compounding ratio that gives the maximum filling rate is determined by the maximum size and shape of the pellet. However, the blending ratio that provides the maximum filling rate is not always optimal for other characteristics such as fluidity. It is preferable to determine the compounding ratio of the pellets (A) and the pellets (B) in consideration of these matters. However, pellet (A) / pellet
When the weight ratio of (B) exceeds 1: 4 or the weight ratio is less than 4: 1, the filling rate is slightly improved,
There is no point in formulating pellets with different maximum dimensions. Therefore, in order to sufficiently obtain the effect of improving the filling rate, the pellets (A) and one or two types of pellets (B) are blended in a weight ratio of 1: 4 to 4: 1. Is preferred.

The pellets used for the amorphous refractory material of the present invention are required to have the same shape as it has been molded. What is formed into a large shape and then granulated by crushing or the like is not preferable because one end of scaly graphite or the like appears on the surface of the crushed particles and the workability is deteriorated.

Further, the pellets used for the amorphous refractory material of the present invention may have different materials and manufacturing methods depending on the purpose as well as the maximum size difference.

The refractory powder portion of the amorphous refractory material of the present invention is
Basically, it consists of a refractory material, a carbonaceous material, and other additives like the conventional carbon-containing amorphous refractory material. here,
In the irregular refractory material of the present invention, the pellets are used together as a kind of carbonaceous material that can be treated as a granular material like the refractory material, and 50% by weight or more of the total carbon amount in the refractory powder part is pellets. It is preferable to adjust the blending amounts of the scaly graphite and other carbonaceous materials in the pellets and the blending amount of the pellets so that the pellets are supplied from Of the carbon sources required for the entire amorphous refractory, the amount of carbon supplied from the pellets is small, that is, if there are many carbonaceous materials that are directly mixed with the refractory powder part other than the pellets, flat graphite such as scaly graphite is used. In the case of carbon having a different shape, the filling property at the time of molding cannot be obtained, and only a construction body having high porosity and low strength can be obtained. By supplying 50% by weight or more of the total amount of carbon in the refractory powder portion from the pellets, it is possible to obtain a stable construction body with low porosity and high strength.

The refractory material other than the pellets in the refractory powder portion of the amorphous refractory material of the present invention is not particularly limited, and a refractory material having properties similar to the refractory material forming the pellets is preferable. The type of refractory material is the environment of the application in which the amorphous refractory of the present invention is used, for example, the operating temperature,
It is preferable to select according to the atmosphere component, the slag component, etc., and in the application exposed to the slag having a relatively strong acidity such as the blast furnace gutter and the mixed pig iron wheel, SiO ₂ , ZrO ₂ , Al ₂ O ₃ , S
Acidic or neutral refractory materials mainly composed of iC etc. are good,
On the other hand, a basic or neutral refractory material mainly containing MgO, CaO, Al ₂ O ₃ , Cr ₂ O ₃ or the like is suitable for a slag having a relatively high basicity such as a converter or an electric furnace. .

The total carbon content in the refractory powder part consisting of pellets and refractory material is preferably at least 5% by weight. If it is less than 5% by weight, the effect of carbon addition is small, while
Practically, an amount of 35% by weight or less has a sufficient effect.
In addition, these refractory materials should be adjusted and used so as to have an appropriate particle size composition according to the construction method of each irregular refractory material. For example, in the case of vibration pouring construction, it is common to place importance on the fluidity to obtain a continuous particle size ranging from coarse particles to fine powder. Other construction methods include stamping, vibration pressurization, spraying, trowel coating, press fitting, etc., but it is preferable to use a refractory material whose particle size has been adjusted in consideration of the respective workability and filling property. Improved liquidity,
In order to improve the filling property, it may be necessary to blend the particle size with the addition of ultrafine powder.

In some cases, it may be better to add a small amount of carbonaceous material to the refractory powder part of the amorphous refractory material of the present invention in addition to the pellets. As described above, it is better not to mix scaly graphite or the like from the aspect of filling property, but since the pellets are particles only and not powders, in the case of a formulation that depends on the pellets for the entire amount of carbonaceous material, fine powder In the matrix part, there is no carbonaceous material other than the carbon content due to the carbonization of the resin liquid part which is the binder, and there is a difference in thermal and mechanical properties between the matrix part and the pellet, which may lead to an undesirable state. . This is particularly remarkable in the case of an amorphous refractory having a large amount of carbon such that the total amount of carbon is 20% by weight or more. Therefore, in the refractory powder part, workability, that is, as a carbonaceous material that does not significantly hinder the moldability, artificial graphite, coke, carbon black, etc. It is preferable to add carbon in the form of granules by pretreatment such as forced mixing with the fine powder. If the addition amount at this time is about 10 to 50% by weight of the total carbon amount of the refractory powder portion, the difference between the pellet and the fine powder matrix portion will be practically no problem.

It is possible to add a small amount of a surfactant to the refractory powder part of the amorphous refractory material of the present invention in order to enhance the dispersibility of the fine powder. Further, in order to stabilize the carbon bond due to the carbonization of the resin after heating and to improve the hot strength, metal powder or alloy powder of Al, Si, Mg, etc., SiC, B ₄ C, CaB ₆ etc. Carbides, borides, etc. can also be added. In order to reinforce the carbon bond due to carbonization of the resin liquid part, powdered resin, pitch,
It is also possible to add a small amount of powdery material such as mesophase carbon that produces carbon by heating. In addition, these surfactants, metal powder, alloy powder, carbide, boride,
It is also possible to add a small amount of carbon-producing material to the pellet.

[0040]

EXAMPLES The amorphous refractory material of the present invention will be further described with reference to the following examples. Five types of MgO-C quality pellets having different maximum dimensions were prepared at the blending ratios shown in Table 1 below.
The MgO-C quality pellets 1 and 2 were single-shot briquette granulators, and the MgO-C quality pellets 3 to 5 were pressure-molded using a compression rotary briquette granulator. A resol type phenol resin was used as a binder, and heat treatment was performed at 200 ° C. for 5 hours after molding.

[0041]

[Table 1]

Using these MgO-C quality pellets, amorphous refractories shown in Table 2 were prepared. In addition, except the comparative product 5, a molded product was obtained by pouring while applying vibration with a vibrator. Further, in Comparative product 5, a molded body was obtained by press molding. Each of these molded bodies was heated at 200 ° C. for 5 hours, cut into a predetermined shape, and subjected to an erosion test by a rotary drum system. The corrosion resistance index is shown as a relative erosion amount when the erosion amount of Comparative product 10 is 100. Moreover, after cutting into 40 × 40 × 160 mm, heating was performed at 1000 ° C. for 3 hours in a reducing atmosphere, and the apparent porosity was measured.

[0043]

[Table 2]

In Table 2, pitch-coated scaly graphite is
It is obtained by granulating fine scaly graphite with pitch to impart hydrophilicity.

As is clear from Table 2, the product of the present invention has a low porosity and a high corrosion resistance, and shows a corrosion resistance approaching that of the comparative product 5 (brick). On the other hand, Comparative product 1 is an amorphous refractory that does not use pellets, but has a high porosity and low corrosion resistance. Comparative product 2 uses one type of pellets, and shows good test results as compared with those without pellets. However, since the content of the pellets is smaller than that of the product of the present invention, the porosity is low. It is slightly high and the corrosion resistance is quite poor. Comparative product 3 is a mixture of a larger amount of one type of pellets, but there are too many pellets, and the refractory powder portion other than the pellets does not fill the gaps between the pellets. Is significantly higher and the corrosion resistance is also very low. Comparative product 4 uses two types of pellets to increase the content of pellets, but since the difference in the maximum size of pellets is only 1.5 times, the gap between large pellets is sufficiently filled with small pellets. However, the improvement in porosity and corrosion resistance is slight.

[0046]

The scaly graphite is a very effective material for improving the spalling resistance and slag resistance of refractory materials,
Although it has already been widely used in refractory bricks, it has been difficult to obtain satisfactory filling properties in the case of amorphous refractories, especially due to deterioration of formability. According to the amorphous refractory material of the present invention, even if a large amount of scaly graphite is added and used, it is possible to easily obtain a construction body having excellent filling properties and low porosity. Therefore, since it is possible to obtain a dense and high-strength construction body containing scaly graphite, due to the property that the carbonaceous material has poor wettability to slag, there is little slag infiltration, and slag erosion resistance is excellent in irregular fire resistance. You can get things.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroaki Ishida 4-53-3 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd. (72) Yoshiyasu Shirota 4-chome, Kitahama, Chuo-ku, Osaka City, Osaka Prefecture No. 5 33 Sumitomo Metal Industries, Ltd.

Claims (2)

[Claims] 1. A resin-bonded carbon-containing amorphous refractory material comprising 100 parts by weight of a refractory powder consisting of pellets and a refractory material, and 3 to 15 parts by weight of a resin liquid portion, wherein the pellets are scaly graphite and refractory. Maximum dimensions 5-1 obtained by adding a binder to a mixture of aggregates and press forming
5 mm single size pellet (A) and one or two single size pellets (B) having a maximum size of at least twice the maximum size of the pellet (A) and 100 mm or less.
And the weight ratio of pellets (A): pellets (B) is 1: 4.
A resin-bonded carbon-containing amorphous refractory, characterized in that the total amount of the pellets is in the range of 60 to 85% by weight of the refractory powder part. Wherein when a pellet (B) the largest dimension of the pellets is small (B _1), from 2 kinds of pellet each larger than the maximum dimension of the pellets (B ₂₎ made, the largest dimension of the pellet (B ₂₎ The resin-bonded carbon-containing amorphous refractory material according to claim 1, wherein the size is at least twice the maximum size of the pellet (B ₁ ).