KR20020011877A - Spray operation method of indeterminate form refractories - Google Patents

Abstract

PURPOSE: To provide a method for executing wet spraying of a monolithic refractory adapted for execution of a small amount of works, such as spray repair of a refractory furnace wall. CONSTITUTION: A monolithic refractory composition contains fire resistant aggregates, fire resistant powder, and liquid body formed that a composition having the particle diameter of 95 mass% or more of a total particles of the composition being 0.20 or less based on the inside diameter of forced feed piping is kneaded is fed with a pressure to a spray nozzle through forced feed piping, having an inside diameter of 35 mm or less, by a forced feed pump and sprayed through the spray nozzle.

Description

SPRAY OPERATION METHOD OF INDETERMINATE FORM REFRACTORIES}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet spray construction method for amorphous refractory materials, and more particularly, to a wet spray construction method for amorphous refractory materials suitable for a small amount of construction, such as spraying a small amount of amorphous refractory material or spraying a fireproof wall.

Conventionally, several methods have been proposed as wet spray application methods of amorphous refractory materials, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-25175. However, these spray construction methods are mainly for the construction of large quantities of amorphous refractory materials, and the whole apparatus is very large and the restrictions on spray conditions or spray materials are not severe, thus the equipment cost is high, and the spray of small irregular refractory sprays is small. In addition, it was not necessarily suitable for a small amount of construction, such as repairing a defective part of a wall by fire resistance.

As a small amount of construction methods, such as repair of the defect part of a fireproof furnace wall, the coating method, the spray construction using various mini guns, etc. are known. However, these methods are convenient and useful when the repair points are very small, but on the contrary, they are too small, and when used to repair a part of a large size, such as a large industrial fire wall, the work becomes complicated, and also the quality of the construction body of the repair points. There was a fear of becoming uneven.

The present invention is suitable for a small amount of construction, such as spraying of small-size irregular refractory or spraying of a fireproof wall, with small and irregular quality, and having excellent and uniform quality without the whole equipment being small and complicated for work. An object of the present invention is to propose a method for wet spraying an amorphous refractory material.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, the present inventors studied the wet spray construction method of the amorphous refractory body suitable for a small amount of construction. As a result, the clay which knead | mixed the amorphous refractory composition containing liquids, such as a refractory aggregate, a refractory powder, and water, When the pump is pumped to the spray nozzle via the pressure feed pipe, and the soil is sprayed from the spray nozzle for a small amount of construction, it is naturally required to make the internal diameter of the pressure feed pipe smaller than before. However, in the case of using a small inner diameter of the pressure feed pipe, when using a kneaded mixture of the conventional amorphous refractory composition, particles are bridged and clogged in the pressure feed pipe within a short time, and the squeeze pump It was found that the discharge resistance was increased and the amount of feeding was significantly lowered so that normal spraying was impossible.

The inventors have found out the cause, and the problem is that the size of each particle contained in the amorphous refractory forming the clay, in particular, the particle size of the refractory aggregate, is a problem. It was found that the inner diameter of the pipe should have a value smaller than the predetermined value.

In addition, when repairing a fireproof wall or the like, a quickener is injected into the soil to be sprayed, and the injection amount of the quickener is changed in the process of spraying. It has also been found that a good quality construction can be obtained by injecting into the soil.

In this way, the present invention is to pressurize the clay which kneads the refractory aggregate, the refractory powder and the liquid containing an amorphous refractory composition to a spray nozzle via a pressure feed pipe by a compression pump, and sprays the clay from the spray nozzle. The method is characterized in that the inner diameter of the pressure feed pipe is 35 mm or less, and 95% by mass or more of all the particles contained in the amorphous refractory composition has a particle diameter of 0.20 or less with respect to the internal diameter of the pressure feed pipe. Provides a wet spray construction method of refractory materials.

In addition, the present invention, in the downstream of the pressure feed pipe, the rapid agent is injected into the clay, and the injection amount of the rapid agent to the clay is changed during spraying, and in particular, the spray agent for the clay is sprayed. It provides a wet spray construction method of amorphous refractory, characterized in that the injection in the final step of.

Hereinafter, the present invention will be described in more detail.

In the wet spray construction method of the amorphous refractory material of the present invention (hereinafter, simply referred to as the main spray construction method), the clay is kneaded by mixing an amorphous refractory material (hereinafter simply referred to as the present refractory composition) containing a refractory aggregate, a refractory powder, and a liquid. The pump pumps the sprayed soil to the spray nozzle via a feed pipe having an inner diameter of 35 mm or less, and wet sprays the soil from the spray nozzle. In this case, when the inner diameter of the pressure feed pipe exceeds 35 mm, the amount of spray per unit time becomes too large, and it is not suitable for the small amount of wet spray construction aimed at by the present invention. On the other hand, if the inner diameter of the pressure feed pipe is too small, pressure loss occurs, so 32 mm or less is particularly preferable. The length of the pressure feed pipe is also related to the pump power, but is preferably 40 m or less because it is suitable for a small amount of spray construction. As the pressure feed pipe, any metal pipe, rubber hose, or the like can be used without particular limitation as long as the pressure feed pump and the spray nozzle can be connected.

In the present spray construction method, as described above, 95 mass% or more of the particles in the present refractory composition has a particle diameter of 0.20 or less with respect to the internal diameter of the pressure feed pipe, that is, (95 mass% or more particle diameter / pressure pipe in the present refractory composition). It is necessary that the ratio of (inner diameter of) is 0.20 or less. Here, a particle diameter is calculated | required using the standard set prescribed | regulated by JIS. If the ratio exceeds 0.20, the particles are bridging in the pressure feed pipe and are easily occluded. In particular, the ratio is preferably 0.18 or less. In addition, although the ratio of the inner diameter of the said particle diameter / pressure piping was 95 mass% or more of the particle | grains in this refractory composition, it is preferable that 97 mass% or more, especially 100 mass% of the particle | grains in this refractory composition have the said ratio.

In this way, the refractory aggregate and refractory powder which form the present refractory composition in the present spray construction method are selected to satisfy the above conditions. In other words, fire-resistant aggregates include alumina, bauxite, diaspore, mullite, kyanite, bento anticancer, chamotte, silica rock, pyrophyll. Pyrophyllite, sillimanite, andalusite, chromite, spinel, magnesia, zirconia, zircon, chromia, silicon nitride, aluminum nitride, silicon carbide, boron carbide, graphite, etc. Preference is given to using one or more selected from carbon, titanium boron and zirconium boron. These fire resistant aggregates preferably have a particle diameter of 12 mm or less, particularly 10 mm or less. In addition, two or more kinds of particle sizes, for example, a combination of granulation, neutrality, and fine grains, are used. In this case, in consideration of other particles, 95 mass% or more of the particles has a particle diameter / inner diameter ratio of the pressure pipe of 0.20 or less. Needs to be

In addition, the refractory powder contained in this refractory composition fills the gap between refractory aggregates, and forms the joint part which couples refractory aggregates, and it is preferable that average particle diameter is 30 micrometers or less. Preferable examples thereof include alumina cement, alumina, titania, bauxite, diaspoa, mullite, panto-cancer, chamotte, pyropyrite, silymanite, andryusite, silica, chromite, spinel, magnesia, zirconia, Amorphous silicas such as zircon, chromia, silicon nitride, aluminum nitride, silicon carbide, boron carbide, boron titanium, zirconium boron, kyyanite, refractory clay, kaolin, bentonite or fumed sileca have. These are used individually or in combination.

As part or all of the refractory powder, if the refractory powder having an average particle diameter of alumina or fumed silica or the like is 10 μm or less, preferably 5 μm or less, the amount of liquid such as water contained in the composition can be reduced, and Good magnetic fluidity can be provided to the clay after kneading. In addition, alumina or silica may be used not only in powder but also in alumina sol, silica sol or colloidal silica. In particular, when alumina cement is used as part of the refractory powder, alumina cement functions as a binder of amorphous refractory materials, and the construction body can maintain strength in a wide range from room temperature to high temperature. As the binder, a phosphate such as phosphoric acid or aluminum phosphate, a silicate such as sodium silicate or potassium silicate, a lignin sulfonate, a water-soluble phenol or the like can be added as a binder as a powder or an aqueous solution.

In order to impart good magnetic fluidity to the clay, this powder is added and used as necessary. As a powder agent, 1 or more types chosen from condensed phosphates, such as sodium tetrapolyphosphate and sodium hexane metaphosphate, polycarboxylates, polyacrylates, melamine sulfonate, and (beta)-naphthalenesulfate, are preferable, and this refractory composition When the content of the refractory aggregate and the refractory powder is 100 parts by mass, it is preferable to add 0.02 to 1 part by mass.

The present refractory composition contains a liquid and is kneaded to form a clay. Although such liquid is preferably water, these may be added alone as water, for example, and components such as refractory aggregates, refractory powders and dispersants may be aqueous solutions. It can be added as an accompanying water in the case of adding in the form of, sol or the like. The amount of the liquid contained is 15 parts by mass or less, further 12 parts by mass or less, based on 100 parts by mass of the solid content in the present refractory composition so that the porosity of the formed amorphous refractory mole can be reduced in the case of water to ensure good properties as a refractory. It is desirable to. When there is little liquid in this refractory composition, the refractory aggregate contained in a clay | rock can settle and the heterogeneity of a clay | rock can be suppressed, and the structure of the amorphous refractory body with a small porosity and a homogeneous structure can be obtained.

As mentioned above, 95 mass% or more of the refractory aggregate and refractory powder which form this refractory composition, and the dispersing agent used as needed have a magnification of 0.20 or less of the particle diameter / inner diameter of the pressure pipe. You need to be satisfied. In this way, especially the particle | grains of the refractory aggregate with a large particle diameter need to be prepared carefully enough to satisfy this.

In the present invention, a commercially available product may be used as the pump for pumping the soil, and it is preferable to use a squeeze pump or a rotary displacement uniaxial screw pump. The squeeze pump refers to a pump for sweeping elastic tubes through a roller and for conveying the soil. It is more preferable when the pressure conveying pump is a squeeze pump and has a pressure conveying path made of a rubber pumping tube having an inner diameter of 35 mm or less.

As a spray nozzle, what is normally used by a wet spray can be used. For example, a taper nozzle etc. can be illustrated. If the cross sectional area of the tip of the spray nozzle is 80% or less in the pressure pipe section, the amount of adhesion to the walls of the refractory furnace is good, and the rebound loss decreases, so that a healthy construction body can be obtained.

In the present invention, when a fastener is added to the clay downstream of the pressure feed pipe, particularly in the vicinity of the spray nozzle, it is preferable that the amorphous refractory body is a good refractory material without being sprayed after being sprayed. In addition, a spray nozzle vicinity means the piping of a spray nozzle or a part near a spray nozzle. As a fastener, what is powder or a liquid can be used. In order to ensure a good refractory property by limiting the amount of water in the sprayed clay to the minimum necessary, powdered fasteners are preferably used. When using the quickener of aqueous solution, it is preferable to use aqueous solution which is as thick as possible, since the compactness of the construction body after spraying does not fall well.

A device capable of uniformly controlling the amount of powder added can be preferably used for conveying the powdery fastener, but an apparatus for conveying the quickener using compressed air as a carrier is usually used. Also, in the case of using a liquid fastener, a liquid pump capable of uniformly controlling the supply amount is preferable, and it is necessary to appropriately select it according to the type of the fastener used, but a plunger pump, a diagram pump, and a rotating volume A uniaxial eccentric screw pump or the like is preferably used.

Examples of the quickener include silicates such as sodium silicate and potassium silicate, aluminates such as sodium aluminate, potassium aluminate and calcium aluminate, carbonates such as sodium carbonate, potassium carbonate and sodium bicarbonate, sodium sulfate, potassium sulfate and magnesium sulfate. Sulfate, CaO-Al ₂ O ₃ , 12CaO- 7Al ₂ O ₃ , CaO- 2Al ₂ O ₃ , 3CaO-Al ₂ O ₃ , 3CaO- 3Al ₂ O ₃ ㆍ CaFe ₂ , 11CaO · 7Al ₂ O ₃ ㆍ CaF ₂ At least one selected from calcium aluminates, calcium oxide, calcium hydroxide, calcium chloride and these complexes or mixtures thereof may be used. Moreover, not only the above, but also a known quickener, a flocculant, etc. can be used.

Although the required amount of the quick setting agent changes to some extent depending on the type of the quick setting agent, it is preferable to adjust the injection amount according to the type of the quick setting agent and the length of the pipe after the quick setting agent is injected. Moreover, in the case of a liquid fastener, it can be used as a solution which disperse | distributed the said powder fastener with water etc.

Among the above-mentioned fasteners, it is preferable to use powder or aqueous solution of sodium aluminate in view of easy availability, low cost, and excellent properties. Because of its high melting point, sodium aluminate does not lower the refractory degree of refractory, and when injected into the clay, it is hydrolyzed to form a gel of Al (OH) _{3 in} addition to NaOH to rapidly cure the clay.

It is preferable that the injection amount of a quickening agent shall be 0.05-3 mass parts with mass on a dry basis with respect to 100 mass parts of this refractory composition except a dispersing agent. If it is less than 0.05 parts by mass, even a good performance fastener may lack spraying speed, causing sprayed clay to flow down, and when more than 3 parts by mass is injected, it hardens rapidly, making it difficult to spray, or heat or corrosion resistance. The performance as a refractory will fall.

In this spray construction method, it is preferable to change the injection amount of the fastener to the clay during the spray construction to obtain a construction body having excellent properties such as durability. For example, in the case of repairing the gap between the walls by refractory, without adding a fastener at the start of construction, a method of injecting a quickener immediately before the final stage of construction, preferably just before completion, A method of injecting a fastener of several mass% to several tens of mass% of the quickener, increasing the amount of the quickener with progress of construction, and finally injecting a predetermined amount of the fastener is selected. By adopting such a fastening agent injection method, since there is little or no quickening agent in the interior of the construction body, the fire resistance is excellent, while on the other hand, there is a sufficient fastening agent in the vicinity of the surface, whereby a construction body having excellent strength characteristics is obtained.

In addition, in the present spray construction method, if necessary, by adding 0.002 to 0.2 parts by mass of a retardant to 100 parts by mass of the present refractory composition, it is possible to ensure the usable time of kneaded clay and spray the refractory stably. Can be installed. As the retardant, weak acids such as oxaluric acid, boronic acid, malic acid, citric acid and lignin sulfonate can be preferably used.

In the present spray construction method, when the soil has magnetic fluidity, it is preferable that the workability is good and that the obtained body also exhibits good characteristics. This self-flowability is applied to the clay immediately after kneading by adding water of about 20 ° C. to the present refractory composition, immediately after kneading into a cone-shaped cone shape having an upper and lower end opened at a top inner diameter of 50 mm, a bottom inner diameter of 100 mm, and a height of 150 mm. The topsoil is filled and filled, and the cone shape is drawn upwards and represented by the diffusion diameter (average of two directions of diffusion measured as a flow value below) when the cone shape is allowed to stand for 60 seconds.

Topsoil shows magnetic fluidity when the flow value is 165 mm or more. However, in order to send the clay kneaded in the pressure pump and the pressure pipe to the construction site easily and without stagnation, the flow value of the clay pumped by the pressure pump is preferably 180 mm or more. In addition, it is particularly preferable that the flow value of the clay is 200 mm or more. When a large flow value is used, the suction resistance of the pressure feed pump and the flow resistance in the pressure feed pipe can be reduced, which helps to reduce the diameter of the pressure feed pipe or to pump the relatively long distance of the clay.

In this way, according to the method of the present invention, a spray such as spray repair of a wall or the like of small-size amorphous refractory spray or fireproof is performed. In this case, when the fireproof furnace wall sprayed is preferably heated to 50 to 500 ° C, It was found that the amount of the fastener was at least as compared with room temperature, and the characteristics of the obtained construction body were also good. Especially this temperature is especially good when it is 100-400 degreeC, especially 200-350 degreeC.

EXAMPLE

In the following, Examples 1 to 4 and Examples 7 to 10 show examples of the present invention, and 5 and 6 show comparative examples of the present invention.

Example 1 to Example 7

Refractory aggregates, as shown in Table 1, are chamostat aggregates having an Al ₂ O ₃ , SiO ₂ and Fe ₂ O ₃ content of 43% by mass, 53% by mass and 0.9% by mass, respectively, and the respective particle sizes are defined below. One having a particle diameter to be used was used. Yellow granules A: 10 to 6 mm, yellow granules (B): 6 to 4.0 mm, assembly A: 4 to 3.5 mm, assembly B: 3.5 to 1.68, neutrality: 1.68 to 1 mm, fine grains: 1.68 mm or less, Fine grain: 0.15 mm or less.

As a refractory powder, alumina cement having Al ₂ O ₃ and CaO content of 74 mass% and 25 mass%, respectively, having an average particle diameter of 8 μm, purity of 99.6 mass% of Al ₂ O ₃ and an average particle diameter of 4.3 μm A fumed silica having a purity of 93 mass% of phosphorus via-alumina and SiO ₂ and an average particle diameter of 0.8 mu m was used. Further, a powder of tetra-sodium polyphosphate content of P ₂ O ₅ and Na ₂ O are respectively 60.4% by weight and 39.6% by weight was used as a dispersant.

Combination of the refractory aggregate, the refractory powder and the dispersant is added thereto, and the amount of water shown in Table 1 (internal mass% for the fire resistant aggregate and the refractory powder, and external mass% for all others) is added, and the mortar mixer in a 100 kg capacity is added. The mixture was kneaded for 3 minutes at to make up the clay.

The fluidity of each clay was filled with each kneaded clay with a top inner diameter of 50 mm, a bottom inner diameter of 100 mm, and a height of 150 mm, and the top and bottom ends were filled with conical rhombuses immediately after kneading, and the cone shape was pulled upwards. The diffusion diameter when left to stand for 60 seconds was measured with the slide calipers about 2 directions, and the average value was made into the flow value.

As a fastener, the clay of the combination shown in Table 1 was prepared using the sodium aluminate aqueous solution (specific gravity: 1.50-1.53, 20 degreeC, powder concentration about 60 mass%), and the wooden wall surface of the vertical 400 mm angle (anchor) was prepared. Is not installed) to a thickness of about 70 mm. These tests were carried out by mixing water at about 20 ° C. with the composition in a room at about 20 ° C. unless otherwise indicated.

In the above example, a squeeze type pressure pump having a pumping tube having internal diameters of 25 mm and 32 mm was used as the pressure pump, and the pressure was adjusted to about 1 ton / hour by kneading the mixed soil, and 0.4 at the compressed air inlet. Compressed air adjusted to ˜0.6 MPa was injected to apply clay to the spray nozzle.

In addition, in order to quantitatively inject the liquid fastener into the clay, a rotary displacement uniaxial screw pump was used, and the amount of the fastener shown in Table 1 was adjusted.

In the spray construction apparatus used in the above embodiment, the pressure feed pipe from the pressure feed pump to the inlet of the compressed air is a rubber hose having an inner diameter of 32 mm or 25 mm and a length of 20 m, and the compressed air and the fastener From the injection port to the nozzle, a steel pipe having the same inner diameter as the rubber hose was used, and a tapered nozzle having a length of 100 mm was connected to the distal end. Each pressure feed pipe, a nozzle, etc. were connected so that there might be no step inside. Here, the compressed air and the fastener are injected into the clay by the Y-shaped tube, but the compressed air and the fastener are mixed before the injection into the clay.

Since the spray nozzle and the rubber hose are sufficiently small and lightweight, and the pressure feed pipe is a rubber hose, the movement and the direction of the rubber hose are easily changed and the direction of the rubber hose is easily changed. In the construction method of the present invention, since rebound and dust are hardly generated during spray construction, and the inner diameter of the pressure feed pipe is small, the mass of the spray nozzle portion is small and the working environment is very good as compared with the conventional wet spray construction method.

The construction body sprayed with a thickness of about 100 mm on the construction wall surface was allowed to stand in a room at 20 ° C. for 24 hours, and a sample having a rectangular parallelepiped shape of 4 cm × 4 cm × 8 cm was adopted for each construction body. After drying at 110 ° C. for 24 hours, the porosity, volume specific gravity, and compressive strength were measured according to the method defined in JIS R2205. The results are shown in Table 1.

In addition, in Table 1, the largest particle diameter shows the largest particle diameter which 95 mass% or more of all the particles in this refractory composition have, (double-circle) is very good, (circle) is good, and x is impossible, and each item is The units are as follows. Moisture content:% by mass, Flow value: mm, Potable use time: min, Pressure pipe diameter: mm, Max. Particle size: mm, Fastener:% by mass, Appearance porosity:%, Compressive strength: MPa. In addition, these are the same also in Table 2 mentioned later.

TABLE 1

Yes One 2 3 4 5 6 7 Chamotte Yellow A Chamotte Yellow B B Chamotte Assemble A Chamotte Assemble B Chamotte Neutral Chamotte Fine Grain Chamotte Fine Buyer-Alumina Fumed Silica Alumina Cement 10525152051010 1030152051010 2515152051010 354051010 10525152051010 105520152051010 7551010 Dispersant water content: Flow Chipping Available Time Self-flowing star 0.19.5≥240120 ◎ 2 0.19.5≥240120 ◎ 2 0.19.5≥250 120 ◎ 2 0.112≥230120 ◎ 2 0.19.5≥250120 ◎- 0.19.5≥240120 ◎- 0.113≥230120 ◎ 2 Pneumatic piping internal diameter: A Maximum particle diameter: BB / A ratio Pump Filling temperature in the pneumatic spray pore: ℃ 3260.19 ○ ◎ -room temperature 3240.13 ◎◎ -room temperature 253.50.14 ◎◎ -room temperature 251.60.07 ○ ◎ -room temperature 2560.24 Impossible--Room Temperature Impossible--Room Temperature 250.150.01 ○ -room temperature Physical appearance porosity specific gravity compressive strength of structure 20.52.1028 ◎ 20.82.1129 ◎ 21.02.1030 ◎ 23.52.0520 ◎ ---- ---- 28.01.9017 ○

Example 8-10

Assuming that the target to be sprayed is to repair the defect of the wall by fireproof instead of the flat wooden wall surface of Examples 1 to 7, a gap between 25 mm in width, 700 mm in vertical direction and 200 mm in depth is formed with chamotte. And sprayed between them.

As a powder composition, the same thing as what was used in Example 3 was used, and the sodium hydroxide aqueous solution of the same density | concentration as Example 3 was used, but the addition method of this quickener was performed as follows. That is, in Example 8, the coating agent was always sprayed with a predetermined amount of a fastener added. In Example 9, a half amount of a predetermined amount was added in the first half, and a predetermined amount was added in the latter half or the last step to spray the inter-pole. And in Example 10, it sprayed between the poles without always adding a fastener. In Example 10, the LPG (liquefied natural gas) gas burner was heated to a surface temperature of 300 ° C. between the chamottes between the poles, half of a predetermined amount of a fastener was added in the first half, and a predetermined amount was added in the second half, followed by spraying between the poles. It was.

The results are shown in Table 2. In addition, in Example 8, it was confirmed that some air holes were formed in the inner depth portions of the poles.

TABLE 2

Yes 8 9 10 Chamotte Yellow A Chamotte Yellow B B Chamotte Assembly A Chamotte Assembly B Chamotte Neutral Chamotte Fine Chamotte Fine Buyer-Alumina Fumed Silica Alumina Cement 2515152051010 2515152051010 2515152051010 Dispersant water content: Flow Chipping Available Time Self-flowing star 0.19.5≥250 120 minutes ◎ 2 0.19.5 ≥ 250 120 minutes ◎ 1st half: 1 2nd half: 2 0.19.5 ≥ 250 120 minutes ◎ Before: 0.7 After: 1.6 Pneumatic piping internal diameter: A Maximum particle diameter: BB / A ratio Pump Filling temperature in the pneumatic spray pore: ℃ 253.50.14 ◎◎ ○ room temperature 253.50.14 ◎◎◎ Room temperature 253.50.14 ◎◎◎ 300 Physical appearance porosity specific gravity compressive strength of structure 22.32.0625 ○ 21.52.1132 ◎ 22.02.0524 ◎

According to the spray construction method of the amorphous refractory material of the present invention, the whole apparatus is small and the work is not complicated, the quality of the construction body is uneven or not, and the excellent quality is achieved, and the spray repair of the wall by spraying or refractory of a small amorphous refractory material A wet spray construction method of amorphous refractory materials of a scale suitable for a small amount of construction is provided.

In addition, when repairing a fireproof wall or the like, a fastener is injected into the above-mentioned sprayed clay, the injection amount of the fastened agent is changed during the spraying process, and in particular, a fastener is injected into the clay only at the final stage of spraying. It was also found that the construction body of was obtained.

Claims (7)

A construction method of spraying clay, which is a mixture of an amorphous refractory composition containing a refractory aggregate, a refractory powder, and a liquid, by a pumping pump to a spray nozzle via a feeding pipe, and spraying the clay from the spray nozzle. The wet spray construction method for an amorphous refractory, characterized in that the inner diameter of the product is 35 mm or less and 95 mass% or more of all the particles contained in the amorphous refractory composition have a particle diameter of 0.20 or less with respect to the internal diameter of the pressure feed pipe. The wet spray construction method according to claim 1, wherein the pressure feeding pump is a squeeze pump or a rotary displacement uniaxial eccentric screw pump having a pressure conveying path having an inner diameter of 35 mm or less. The wet spray construction method of the amorphous refractory of Claim 1 or 2 which injects a quickening agent with respect to the said clay downstream of the said pressure piping. The wet spray construction method according to claim 3, wherein the injection amount of the quickener to the clay is changed during spray construction. 4. The method of claim 3, wherein the refractory agent for the clay is injected at the final stage of spraying. The deficiency part of a wall by a fireproofing is described in any one of Claims 1-5. Wet spray application method of amorphous refractory repaired by wet spray method of amorphous refractory material. The wet spray construction method according to claim 6, wherein the refractory wall is heated to 50 to 500 ° C.