JPH0926267A - Spraying method for unshaped refractory material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spraying method for unshaped refractory in which powder hardly splash to the circumference and a product with small porosity can be obtained. SOLUTION: The ash soil of a castable refractory having a self-fluidity is forcedly fed by a forced feed pump 1 and forced feed pipelines 2a and 2b. Compressed air and a prescribed quantity of an accelerating agent are injected into the body from a compressed air injecting port 10 and an accelerating agent injecting port 11 provided on the downstream side. The body is sprayed on a construction part 8 from a spray nozzle 4 connected to the end of a nozzle pipeline 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for spraying an irregular shaped refractory material capable of constructing an irregular shaped refractory material having a large bulk density.

[0002]

2. Description of the Related Art Spraying an irregular refractory material has an advantage that the construction work can be saved as compared with a construction method by pouring because a mold is not required. For this reason, a method of spraying an irregular shaped refractory has been conventionally practiced.

The conventional spraying method is a so-called dry or semi-dry spraying method, in which there is no flowable kneaded material, that is, a dry amorphous refractory powder composition or an amorphous refractory powder. Moistened kneaded material mixed with an amount of water that does not exhibit fluidity is conveyed to the construction site by piping using compressed air as a carrier, and the spray nozzle is required to have sufficient or insufficient water content for the amorphous refractory Water and quick-setting agent are injected and sprayed from a spray nozzle.

However, according to such a method, fine particles of the refractory powder composition, such as 0.1 mm or less, in the kneaded clay are sprayed in an insufficiently dispersed and wet state of the particles of the refractory powder. As it is installed, a large amount of air is taken into the kneaded clay of the spray-formed amorphous refractory, and as a result, the spray-formed amorphous refractory structure is poured into the irregular refractory. Compared with the construction body of No. 2, the porosity was large (bulk specific gravity was small), and the porosity was large, so that the refractory properties such as corrosion resistance were inferior.

[0005] JP-B-2-27308 and JP-A-62-36
In No. 071, in order to suppress the generation of dust at the time of construction, a certain amount of water is mixed in advance with the powder composition for amorphous refractory, and the insufficient water and the aqueous solution of the quick-setting agent are injected by a spray nozzle. Although a method is proposed, there is a limit to the amount of water that can be premixed with the powder composition for amorphous refractory to prevent the air flow conveying pipe from being blocked by the kneaded clay of the irregular refractory, and air intake The generation of dust and dust could not be avoided sufficiently. In addition, there is also a problem in the working environment that a considerable amount of rebound loss occurs during spraying and dust is scattered around.

In addition, when the remaining water is injected into the wet kneaded material which has been conveyed immediately before the spray nozzle, it is inevitable that the water content in the kneaded material to be sprayed will be non-uniform. In particular, when constructing an irregular refractory in which refractory ultrafine powder is mixed to improve fluidity and densify the irregular refractory, mix it with the powder composition for irregular refractory. The absolute amount of water was small, making spraying more difficult.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, to further save labor during construction, to reduce dust scattering to the surroundings, and to carry out construction. It is an object of the present invention to provide a method for spraying an amorphous refractory material having a large bulk specific gravity and excellent characteristics as a refractory material because the porosity of the body can be reduced.

[0008]

A method for spraying an amorphous refractory according to the present invention comprises a powder composition for an amorphous refractory containing a refractory aggregate, a refractory powder and a small amount of a dispersant (hereinafter, referred to as A kneaded material with self-fluidity obtained by kneading by adding water to (powder composition) is pressure-fed to a construction site by a pressure pump and pressure piping, and a compressed air injection port and a quick connection provided downstream of the pressure piping. Compressed air and the required amount of quick-setting agent were injected into the kneaded material from the agent injection port, and the kneaded material mixed with the quick-setting agent was injected together with the injected compressed air to the spray nozzle connected to the tip by nozzle piping, The feature is that the kneaded clay is sprayed onto the construction site from the spray nozzle.

The main feature of the spraying method of the present invention is that the kneaded clay of a self-fluiding, unshaped refractory is pumped to the construction site by a pump and pumping pipe. According to this method, it is possible to send the kneaded clay of the irregular-shaped refractory that has been mixed with the required water in advance to the construction site with the pressure pump and the pressure-fed piping, and the kneaded clay by mixing the required water in advance. The distribution of water inside is uniform, and there is almost no air around the particles in the kneaded clay until the compressed air is injected,
Most of the air bubbles entrained when compressed air, which is a carrier, is injected into the kneaded clay, and most of the bubbles are released from the kneaded clay during the spraying work. can get.

In the spraying method of the present invention, a required amount of the quick-setting agent is injected into the kneaded material in addition to the compressed air, and the kneaded material sprayed from the spray nozzle to the construction site is injected through the nozzle pipe. After that, the liquidity decreases rapidly. Therefore, for example, even if the kneaded clay is sprayed on the vertical wall surface, the sprayed kneaded clay does not flow down from the wall surface and can be constructed. Further, since the spray nozzle is connected to the tip of the nozzle pipe, only one pipe is required to be connected to the spray nozzle, and the operation of moving the spray nozzle up, down, left, and right is easy. Preferably, the nozzle pipe is made flexible and the nozzle pipe is easily bent, so that manual spraying can be facilitated.

The injection point of the quick-setting agent is preferably located downstream of the injection port of the compressed air or at the same position as the injection port of the compressed air. The kneaded material after the quick-setting agent has been rapidly hardened is sent to the spray nozzle through the nozzle pipe in a state where it is rapidly hardened, and is sprayed from the spray nozzle. The clay after injecting the quick setting agent is
Turbulent agitation during passage through the nozzle pipe causes the powder to be more well dispersed in the clay, and as a result, the required amount of quick-setting agent injected into the clay can be reduced. The length of the nozzle pipe is preferably 100
The effect of turbulent stirring can be obtained by setting the thickness to at least 200 mm, especially at least 200 mm.

If the nozzle piping is not provided or the quick-setting agent injection port is provided in the spraying nozzle portion, the quick-setting agent may be dispersed poorly or the quick-setting failure may occur, and the kneaded clay after spraying may drop. In order to prevent this, injecting a large amount of the quick-setting agent is not preferable because it causes blockage in the spray nozzle portion and deterioration of refractory performance.

The pumping pipe and the nozzle pipe are manually sprayed or moved to different positions, but in order to reduce the pumping load on the pump, the pipe is 50 A or more (JIS G345).
2, the same applies hereinafter) is preferable, and when the inside of the pipe is filled with the clay, the weight becomes considerable.

Here, by providing the injection point of the quick-setting agent downstream of the compressed air injection port, and more preferably by 1 m or more downstream, the kneaded clay in the pipe downstream of the compressed air injection port is
Since it is in the idle state, the weight of the piping is lightened and the handling by hand becomes easy.

If the injection cylinder for the quick-setting agent is located at the same position as the injection port for the compressed air, the empty load load section of the kneaded material after the quick-setting only needs to be the nozzle piping section, and the amount of injected air can be reduced. ,
Particularly low water content (preferably 5-7% on the same basis as in the examples)
It can reduce the amount of dust generated from the irregular shaped refractory. Here, since the pressure feed pipe upstream of the nozzle pipe is filled with kneaded clay and becomes heavy, the pipe size is preferably around 50A.

As one mode for setting the injection cylinder for the quick-setting agent at the same position as the compressed air injection port, a part or all of the compressed air injected into the kneaded clay is used, and the quick-setting agent is injected. To be done. In particular, when all of the compressed air injected into the kneaded material is used to inject the quick-setting agent, the compressed air is injected into the kneaded material through a common pipe together with the quick-setting agent. It can save its own piping to inject.

In the present invention, the fluidity of the kneaded material is evaluated at room temperature of about 20 ° C. using a cone type. That is, the kneaded material immediately after kneading by adding water of about 20 ° C. to the powder composition is immediately kneaded into a cone-shaped cone having an upper inner diameter of 50 mm, a lower inner diameter of 100 mm, a height of 150 mm, and open upper and lower ends. Pour the kneaded material and fill it, and then pull out the cone shape from above to 60
It is indicated by the diameter of the spread when left still for 2 seconds (the average value of the spread in two directions, hereinafter referred to as the flow value).

The kneaded material exhibits self-fluidity when the flow value is 165 mm or more. However, the flow value of the kneaded material pumped by the pressure pump is 180 m so that the kneaded material kneaded by the pressure pump and the piping can be easily and smoothly sent to the construction site.
It is preferably m or more, and more preferably 200 mm or more. If the kneaded material having a large flow value is used, the suction resistance of the pressure feeding pump and the flow resistance in the pressure feeding piping can be reduced, and the diameter of the pressure feeding piping can be reduced and the kneaded material can be fed over a long distance.

The powder composition used in the present invention comprises a refractory aggregate, a refractory powder and a small amount of a dispersant. The refractory powder fills the gaps between the refractory aggregates to form a joint that joins the refractory aggregates. The refractory aggregate, alumina, bauxite, diaspore, mullite, shale shale, chamotte, silica stone, pyrophyllite, sillimanite, andalusite, chromite, spinel, magnesia, zirconia, zircon, chromia, silicon nitride, One or more selected from carbon such as aluminum nitride, silicon carbide, boron carbide and graphite, titanium boride and zirconium boride are preferable.

As the refractory powder, alumina cement,
Alumina, titania, bauxite, diaspore, mullite, gravel shale, chamotte, pyrophyllite, sillimanite, andalusite, silica stone, chromite,
One or more selected from amorphous silica such as spinel, magnesia, zirconia, zircon, chromia, silicon nitride, aluminum nitride, silicon carbide, boron carbide, zirconium boride, titanium boride and fumed silica, and has an average particle diameter. Is preferably 30 μm or less.

If, as part of these refractory powders, ultrafine refractory powders having an average particle size of 10 μm or less, preferably 5 μm or less, such as alumina and fumed silica, are used, the amount of water added to the kneaded clay of the composition is increased. Can be reduced and good fluidity can be imparted to the kneaded material after kneading.

As a part of the refractory powder, the average particle size is 30
Good fluidity can also be imparted to the kneaded clay by using a powder composed of spheroidized particles having a size of μm or less. When alumina cement is used as a part of the refractory powder, the alumina cement functions as a binder for the amorphous refractory material, and the work body can retain its strength in a wide range from normal temperature to high temperature.

As a means for imparting good self-fluidity to the kneaded clay, a powder dispersant selected according to the kind of the refractory aggregate and the refractory powder to be used is blended in the powder composition. Is preferred. As the dispersant, polymetaphosphates, polycarboxylates, polyacrylates and β
-One or more selected from naphthalene sulfonates is preferable, and the total amount of the refractory aggregate and the refractory powder of the powder composition is 1
It is preferable to add 0.02 to 1 part by weight to 100 parts by weight.

The amount of water added to 100 parts by weight of the powder composition varies depending on the specific gravity and the porosity of the aggregate, which is the main raw material to be blended with the powder composition, but to impart self-fluidity. There is a lower limit for the amount of water in the kneaded clay necessary for the above, and it is 4 parts by weight or more with respect to 100 parts by weight of the powder composition (4 in the case of an aggregate such as fused alumina having a large specific gravity and a small porosity). (5 parts by weight can provide self-fluidity). The powder composition is usually transported in the form of a dry powder to the vicinity of the construction site, water is added to the powder composition in a mixer brought to the construction site, and the mixture is kneaded and used for spraying construction. However, the kneaded material obtained by adding water to the powder composition and kneading at the factory can be carried to the construction site by a concrete mixer truck and sprayed.

The water content in the kneaded material pumped by the pump, that is, the water content added to the powder composition, is adjusted so that the porosity of the constructed amorphous refractory material can be reduced and good characteristics as the refractory material can be secured. It is preferably 15 parts by weight or less, more preferably 12 parts by weight or less, relative to 100 parts by weight of the body composition. If the amount of water in the kneaded clay is low, it is possible to prevent the refractory aggregates contained in the kneaded clay from settling down and making the kneaded clay non-homogeneous. Is obtained.

As the quick-setting agent to be poured into the kneaded clay, a quick-setting agent in an aqueous solution can be used, but in order to keep the water content in the kneaded material to be sprayed to a necessary minimum and to secure good refractory properties. , Preferably powder is used. The powdered quick-setting agent is preferably injected into the kneaded clay through a quick-setting agent injection port using compressed air as a carrier. When injecting the quick setting agent of the aqueous solution into the kneaded clay, it is preferable to use an aqueous solution that is as dense as possible. The quick-setting agent is preferably blown with compressed air so as to be uniformly dispersed and injected into the kneaded clay by using the compressed air as a carrier.

As the quick-setting agent, sodium aluminate,
Aluminates such as potassium aluminate and calcium aluminate, carbonates such as sodium carbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate, sulfates such as sodium sulfate, potassium sulfate and magnesium sulfate, CaO · A
l ₂ O ₃ , 12CaO · 7Al ₂ O ₃ , CaO · 2Al
₂ O ₃ , 3CaO ・ Al ₂ O ₃ , 3CaO ・ 3Al ₂ O
One or more selected from calcium aluminates such as ₃ · CaF ₂ and 11CaO · 7Al ₂ O ₃ · CaF ₂ , calcium oxide, calcium hydroxide and their composites or mixtures can be used.

Since the required amount of the quick-setting admixture varies to some extent depending on the type of the quick-setting admixture, the injection amount should be adjusted depending on the type of the quick-setting admixture and the length of the nozzle pipe after the pouring of the quick-setting admixture. Is preferred.

Among these quick-setting agents, it is preferable to use a powder or aqueous solution of sodium aluminate because it is easily available and inexpensive, and its quick-setting property is excellent. Since sodium aluminate has a high melting point, it does not reduce the refractory resistance of refractory materials, and when injected into kneaded clay, it hydrolyzes to form a gel of Al (OH) _{3 in} addition to NaOH and rapidly cures the kneaded clay. .

The injection amount of the quick-setting agent is 0.0 on a dry weight basis with respect to 100 parts by weight of the powder composition excluding water and the dispersant.
Preferably, the amount is 5 to 3 parts by weight. If the amount is less than 0.05 parts by weight, even if the quick-setting agent has good performance, the quick-setting speed is insufficient, and the clay that has been sprayed and formed will flow down.
If it is injected in excess of the weight part, it will harden rapidly to make spraying difficult, and the performance as a refractory such as heat resistance and corrosion resistance will deteriorate.

As the pressure feed pump, a commercially available product is available, and therefore it is preferable to use a piston type or squeeze type pressure feed pump. The squeeze type refers to a diaphragm type pump that drives the diaphragm with compressed air, a pump that presses the elastic tube with a roller, and pressure-feeds the clay. As these pumps, it is preferable to use a pump having a plurality of diaphragms, a plurality of tubes, or a plurality of pistons so as to reduce the pulsation of the clay to be pumped.

Also, with respect to 100 parts by weight of the powder composition,
By adding 0.003 to 0.2 parts by weight of retarder, the pot life of the kneaded kneaded material can be extended, and the pot life can be secured even in the summer when the temperature is high, and the refractory can be stably blown. Can be installed. As the retarder, weak acids such as oxalic acid, boric acid, malic acid and citric acid can be preferably used.

[0033]

【Example】

[Examples 1 to 6, 1'and 2 '] As a refractory aggregate, Al ₂
The contents of O ₃ , SiO ₂ and Fe ₂ O ₃ are each 43
% By weight, 53% by weight and 0.9% by weight, coarse particles having a particle size of 1.68 to 5 mm, particle diameters of 0.1 to 1.68 mm
A chamotte aggregate composed of medium particles and fine particles having a particle diameter of 0.02 to 0.1 mm and an average particle diameter of 0.03 mm was used.

As the refractory powder constituting the joint portion of the refractory, the content of Al ₂ O ₃ and CaO is 55% by weight, respectively.
And alumina cement with 36% by weight and an average particle size of 9 μm,
The purity of Al ₂ O ₃ is 99.6% by weight and the average particle size is 4.3.
μm of Bayer alumina and fumed silica having a purity of SiO ₂ of 93% by weight and an average particle size of 0.8 μm were used. As the dispersant, powder of sodium tetrapolyphosphate having P ₂ O ₅ and Na ₂ O contents of 60.4% by weight and 39.6% by weight, respectively, was used.

The powder composition shown in Table 1 was prepared by mixing the refractory aggregate, the refractory powder and the dispersant, and each composition was mixed with water in the amount shown in Table 1 (the refractory aggregate and the refractory powder). Is the internal weight%,
In all other cases, external weight% was added, and the mixture was kneaded for 3 minutes in a vortex mixer having a capacity of 500 kg to obtain a kneaded clay.
The fluidity of each kneaded material is 50 m at the top inner diameter of each kneaded material.
m, the inner diameter of the lower end is 100 mm, the height is 150 mm, and the kneaded clay just after kneading is poured into a cone-shaped cone shape with upper and lower ends opened, and the cone diameter is pulled out upward and left for 60 seconds, and the spread diameter is 2 The direction was measured with a caliper, and the average value was used as the flow value.

The quick-setting agent is a powder having a particle size of 800 μm or less and an average particle size of about 150 μm, and sodium aluminate (containing about 20% of water of crystallization) and sodium carbonate in a weight ratio of 3: 1. The kneaded material having the composition shown in Table 1 was prepared and sprayed. That is, the spraying apparatus having the configuration shown in the schematic diagram of FIG. 1 was used to spray the wall surface (without anchors) made of a vertical iron plate to a thickness of about 100 mm. These tests were carried out in a room at about 20 ° C. with the composition mixed with water at about 20 ° C., unless otherwise specified.

In FIG. 1, 1 is a pressure feed pump, 2a, 2
Reference numeral b is a pressure feeding pipe, 3 is a nozzle, 4 is a spray nozzle, 5 is a feeder for quick-setting agent, 6 is an air compressor, 7 is a kneaded clay container equipped with kneading means, 8 is a construction wall surface, and 9 is spraying construction. The construction body 10 is a compressed air inlet, 11 is a quick-setting agent inlet, and 12 and 13 are air valves. In the following example, Putzm equipped with two pistons as a pressure pump
Using a pressure pump BSA702 manufactured by Ister, the kneaded material having a kneading speed of 3 tons / hour was used, and compressed air adjusted to 4 to 6 atm was injected from the compressed air inlet to supply the kneaded material to the spray nozzle. .

Further, in order to quantitatively inject the powdered quick-setting agent into the kneaded clay, a Q gun manufactured by Nippon Puribrico Co., Ltd. equipped with a table feeder is used, and the air pressure is controlled within a range of ³ to 4 kg / cm ^2. The injection amount of the quick-setting agent shown in Table 1 was adjusted.

In the spraying apparatus used in the above embodiment, the pressure-feeding pipe 2a from the pressure-feeding pump 1 to the compressed air inlet 10 was squeezed to a steel pipe having a size of 65A and a length of 70m and 65A to 50A. It is assumed that a tapered steel pipe with a length of 1 m is connected, and the pressure feeding pipe 2b from the compressed air inlet 10 to the quick-setting agent inlet 11 has a size of 50 A and a length of 3 m.
Nozzle pipe 3 from the injection port 11 of the quick-setting admixture to the spray nozzle 4 with a size of 50 A and a length of 1.2 m
The rubber hose was connected so that there was no step inside the pipe. Further, a Y-shaped tube was attached to each of the compressed air injection port 10 and the quick-setting agent injection port 11.

Since the spray nozzle 4 is connected to a flexible rubber hose, it is easy to move and change the direction within the range covered by the rubber hose. Therefore, the spray nozzle 4 can be manually held and sprayed onto the wall surface 8. It was constructed. In the construction method of the present invention,
There was almost no rebound and dust generation during spraying, and the construction yield and work environment were extremely good compared to the conventional method for spraying amorphous refractories.

The construction body sprayed on the construction wall to a thickness of about 100 mm was left in a room at 20 ° C. for 24 hours, and a construction body sample of about 30 cm × 30 cm was taken from each construction body, and the collected sample After drying at 110 ° C for 24 hours, J
The porosity and bulk specific gravity were measured according to the method specified in ISR2205.

Examples 1, 2 and 1'and 2'of Table 1 are examples of the present invention, and Examples 3 and 4 are examples in which the injection amount of the quick-setting admixture is inappropriate, and Example 3 In the case, the quick-setting agent was insufficient, and the kneaded material fell down from the wall surface, and a satisfactory construction body could not be obtained. Moreover, in Example 4, since the quick-setting agent was excessive, hardening of the kneaded clay proceeded rapidly,
The spraying from the spraying nozzle became unstable, the rebound loss was large, and the adhesion to the wall surface was poor, and again a satisfactory construction body could not be obtained. Therefore, in Examples 3 and 4, the properties of the construction body have not been measured.

Example 5 and Example 6 are the results obtained for cast bodies of indefinite refractory made by casting the kneaded clay of Examples 1 and 2 into a mold having an internal dimension of 40 mm × 40 mm × 80 mm, respectively. From the comparison between Example 1 and Example 2 shown in Fig. 2, the physical properties such as the bulk specific gravity and the compressive strength of the non-standard refractory material obtained by spraying by the method of the present invention are obtained by casting. It can be seen that the physical properties of the refractory materials of the non-standard refractory materials are almost inferior. Example 1 ′ is an example in which the retardant oxalic acid was added to the powder composition of Example 1, and Example 2 ′ was an example in which the retarder boric acid was added to the powder composition of Example 2. is there.

[Examples 7, 8, 7'and 7 "] Table 2 shows the test results using bauxite as the refractory aggregate instead of chamotte. Al ₂ in the bauxite used
The contents of O ₃ , SiO ₂ and Fe ₂ O ₃ are 89 respectively.
%, 7% and 1.3% by weight, and the coarse, medium and fine grain size ranges were the same as for chamotte aggregates.
However, the average particle size of the fine particles of bauxite is 0.02 mm.
Met. Example 7 in Table 2 is an example of the present invention, and Example 8 is a comparative example in which the same kneaded clay is poured and constructed.

Examples 7'and 7 "are examples in which oxalic acid was added as a retarder to the powder composition of Example 7,"
The test was conducted in the summer when the temperature was about 30 ° C. From the results of Example 7 ", it is possible to extend the pot life of the kneaded material after kneading by adding an appropriate amount of the retarder to the powder composition, and to stabilize the kneaded clay even in the summer temperature of 30 ° C. It turned out that it can be sprayed.

As can be seen from Tables 1 and 2, according to the method for spraying an amorphous refractory of the present invention, the porosity and the bulk specific gravity of the obtained construction body are the same as the castable refractory. Compared to the porosity and bulk specific gravity of the construction product, it is comparable.
The porosity of 12.5% or less is the porosity of the irregular refractory obtained by the conventional spraying method of the irregular refractory (for example, chamotte described in the example of JP-A-62-36071). The porosity of the non-standard refractory sprayed body used as an aggregate is significantly smaller than 16%).

Since the corrosion resistance, which is an important use characteristic of refractory materials, is greatly influenced by the porosity of the refractory materials, the construction method of the present invention makes it possible to compare with the cast bodies of the irregular-shaped refractory materials. It can be applied by spraying an irregular shaped refractory with excellent corrosion resistance.

The spraying apparatus shown in FIG. 2 is an example of another spraying apparatus that can be used to carry out the spraying method of the irregular-shaped refractory of the present invention. A compressed air and quick-setting agent injection port 14 is provided between the pressure-feeding pipe 2a and the spraying pipe 3 so that the agent can be injected into the kneaded clay at the same position, and the portion having the same name as the device of FIG. Are assigned the same reference numerals as in FIG.

[0049]

[Table 1]

[0050]

[Table 2]

[0051]

EFFECTS OF THE INVENTION According to the method for spraying an indeterminate refractory material of the present invention, it is possible to achieve a significant labor saving and a significantly shortened construction period as compared with the method of casting by not requiring a formwork. The advantage is obtained. In addition, the porosity of the construction body is adjusted by the conventional spraying method by pumping the kneaded clay having self-fluidity that is kneaded by adding the required water content to the powder composition. It is possible to obtain a non-standard refractory product having a bulk specific gravity that is significantly smaller than that of the non-standard refractory product cast, and has good bulk specific gravity, that is, good corrosion resistance. This non-standard refractory construction product is remarkably excellent in refractory properties as compared to the non-standard refractory construction product having a small bulk specific gravity obtained by the conventional spraying method.

In addition, since the loss due to rebound during spraying is very small, the yield of irregular refractory products is good,
The working environment is also good because little dust is generated.
Labor saving and ensuring a good working environment are also indispensable requirements for the survival and development of the industry in the future, so its industrial value is enormous.

[Brief description of drawings]

FIG. 1 is a system schematic view of an apparatus used for carrying out a spraying method of an amorphous refractory material according to the present invention.

FIG. 2 is a schematic diagram of the system of another device used to carry out the method for spraying an amorphous refractory of the present invention.

[Explanation of symbols]

 1: Pump for pumping 2a, 2b: Pipe for pumping 3: Pipe for nozzle 4: Spray nozzle 5: Feeder for quick-setting agent 6: Air compressor 7: Kneaded clay container with kneading means 8: Wall surface to be constructed 9: Spraying Constructed construction body 10: Compressed air injection port 11: Quick-setting agent injection port 12, 13: Air valve 14: Compressed air and quick-setting agent injection port

Claims (10)

[Claims] 1. A kneaded clay having self-fluidity obtained by adding water to a powder composition for irregular shaped refractory containing a refractory aggregate, a refractory powder and a small amount of a dispersant, and kneading the mixture with a pressure pump and a pressure pipe. Compressed air and the required amount of quick-setting agent are injected into the kneaded clay from the compressed air inlet and the quick-setting agent inlet provided in the downstream part of the pressure-feeding pipe, respectively, and the compressed air is injected together with the injected compressed air. A method for spraying irregular shaped refractory, characterized in that the kneaded material mixed with a binder is sent to a spraying nozzle connected to the tip of the kneaded material by a nozzle pipe, and the kneaded material is sprayed from the spraying nozzle to the construction site. 2. The method for spraying an irregular-shaped refractory according to claim 1, wherein the quick-setting agent inlet is provided downstream of the compressed air inlet or at the same position as the compressed air inlet. 3. The method for spraying an amorphous refractory material according to claim 1 or 2, wherein the quick-setting agent is injected by using a part or all of the compressed air injected into the kneaded clay. 4. A clay having self-fluidity having an upper end inner diameter of 50%.
mm, inner diameter of lower end 100 mm, height 150 mm, and cone-shaped cone-shaped with upper and lower ends opened. The kneaded clay just after kneading was poured into the cone-shaped cone, and the cone-shaped was pulled out upward and left for 60 seconds. The method for spraying an amorphous refractory material according to claim 1, 2 or 3, which has a fluidity as follows. 5. The method for spraying an amorphous refractory according to claim 1, wherein 12 parts by weight or less of water is added to 100 parts by weight of the powder composition for irregular refractory. 6. The amorphous refractory according to claim 1, wherein 0.05 to 3 parts by weight of a quick-setting agent is added on a dry basis to 100 parts by weight of the powder composition for irregular refractory. Method of spraying objects. 7. The quick-setting agent to be injected is a powder.
The method for spraying an irregular-shaped refractory according to any one of 1. 8. The method of spraying an amorphous refractory according to claim 1, wherein alumina cement is used as a part of the refractory powder. 9. The method for spraying an amorphous refractory according to claim 1, wherein a piston type or squeeze type pressure feeding pump is used as the pressure feeding pump. 10. The amorphous form according to claim 1, wherein 0.002 to 0.2 part by weight of the retarder is added on a dry basis to 100 parts by weight of the amorphous refractory powder composition. Method for spraying refractories.