JP2001158671A - Amorphous refractory for wet spray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an amorphous refractory for wet spray capable of enabling the forcefully fed amount of the amorphous refractory for the wet spraying kneaded with water, an aqueous solution or the like to be stable, excellent in properties to be forcefully fed by a pump, and capable of providing the same tolerance as that obtained by casting application. SOLUTION: This amorphous refractory for wet spray consisting essentially of fireproof material having particle diameters regulated so as to be coarse particles to an ultrafine powder, a binder, and the water and/or the aqueous solution is characterized in that the amorphous refractory for the wet spraying contains an additive having air-entraining properties, foamability and expandability, and/or an additive having the air-entraining properties, the foamability, the expandability and dispersibility, and a material after kneading the amorphous refractory for wet spraying, and the water and/or the aqueous solution includes bubbles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an amorphous refractory for wet spraying, and more particularly to a blast furnace gutter, a hot metal pot for the steel industry,
The present invention relates to an amorphous refractory for wet spraying, which is used for construction and repair of mixed iron cars, converters, ladle, RH, TD, etc. and various industrial furnaces.

[0002]

2. Description of the Related Art Irregular refractories are widely used in various kilns because they do not require skilled work such as bricks in construction, and are easy to save labor and automate construction. Above all, the refractory for spraying does not require a construction frame and is excellent in workability. However, the construction obtained by the dry spraying method generally has a higher porosity than the cast material, and is often inferior in durability due to difficulty in densification. In the spraying method, there is dust during construction and rebound loss. As a spraying construction method for solving such a problem, a kneaded irregular-shaped refractory is pumped by a transport pipe by a transporter, and a curing accelerator together with compressed air is compressed by a converging nozzle provided at the tip of the transport pipe. Is added and sprayed.

[0003] The wet spraying method is a construction method in which an amorphous refractory for wet spraying kneaded by a mixer is pump-pumped, a coagulant is added together with air at a nozzle, and sprayed. For this reason, it is necessary that the kneaded material can be stably fed under pressure. One of the major causes of the decrease in pumping performance is separation of coarse particles and fine powder in the kneaded material and solid content and moisture in the kneaded material. In particular, the amorphous refractories for wet spraying tend to have a larger amount of added water than ordinary cast materials in order to reduce the pipe resistance during pressure feeding, so that the viscosity of the material is reduced and the material is easily separated. In wet spraying, since the pipe diameter is reduced to 40 to 50 mm, the pressure tends to be high, and separation is easy. In addition, when the pumping distance is long, or when the kneaded material is stopped for a long time due to the interruption of the construction, the material is easily separated, and the pumping may not be performed. When the pumping becomes impossible, it is necessary to clean a part or the whole of the pipe, and a large amount of labor and time are required for recovery. Further, even when the pumping is not possible, if the material pumping amount is unstable, the addition rate of the curing accelerator fluctuates, which is not preferable. In other words, when the material pumping amount decreases, the addition rate of the hardening accelerator becomes relatively larger than the appropriate value, the material agglomerates quickly, and the construction body tends to be layered toward the working surface, and peeling damage during use occurs. It will be easier. Also, rebound loss increases.

[0004] In general, as a countermeasure for this, separation has been prevented by increasing the proportion of fine powder in the material or by adding clay or a thickener to increase the viscosity. However, there is a problem in that the durability is reduced, such as cracking or peeling due to sintering, or the corrosion resistance is reduced due to the increase in fine powder or the addition of clay.

As an example of using a foaming agent in a spray coating material, Japanese Patent Application Laid-Open No. Sho 62-21766 discloses that a spray material coated on a brick surface of a tundish for continuous casting has a thickness of 1 to 0.5 mm. 20 to 30% by weight, 0.5 to 0.074mm is 20 to 35% by weight,
Refractory aggregate whose particle size has been adjusted to be 35 to 50% by weight of 074 mm or less, 0.5 to 3% by weight of inorganic fiber, 0.1 to 3% by weight of foaming agent and foam stabilizer to 100% by weight There is disclosed a light-weight heat-insulating wet coating material for tundish, which is obtained by adding and mixing 0.05 to 0.3% by weight. This coating material has an extremely high apparent porosity of 40% or more in the construction body, and therefore has high reactivity with slag and molten steel, and is difficult to withstand long-term use. Also, the construction thickness is 30 mm or less, and cannot be applied as a lining material.

[0006] Further, as an example of using a foaming agent in a bubble-containing composition subjected to spraying construction to form a water-permeable layer,
JP-A-10-219248 discloses that a foam-containing composition containing particles, a binder, and a foaming agent that keeps a mixture of the particles and the binder in a flowable state capable of being sprayed is sprayed on a construction surface by a spraying device. There is disclosed a method for forming a water-permeable layer characterized by the following. However, since the bubble-containing composition disclosed in this publication is used for construction and civil engineering work, its durability to molten steel is not considered at all. Furthermore, this composition has water permeability, that is, pores communicating from the back to the back, and is unsuitable as a lining material of a container before durability, and its use as an amorphous refractory for wet spraying. Is completely different.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned drawbacks and problems.
To provide an amorphous refractory for wet spraying which has a stable pumping amount of an amorphous refractory for wet spraying kneaded with water or an aqueous solution, has an excellent pumping property, and has the same durability as that of casting. With the goal.

[0008]

That is, the present invention provides a refractory material having a coarse or ultrafine particle size as an essential component,
A binder and a refractory for wet spraying obtained by kneading water and / or an aqueous solution, wherein the refractory for wet spraying contains an additive having air entrainment, foaming and foaming properties. The present invention relates to an amorphous refractory for wet spraying, wherein the material after kneading the amorphous refractory for wet spraying and water and / or an aqueous solution contains air bubbles.

Further, the present invention relates to an amorphous refractory for wet spraying obtained by kneading a refractory material, a binder, and water and / or an aqueous solution whose particle size has been adjusted to coarse or ultrafine powder as essential components. Amorphous refractory for spraying is air entrained,
Wet spraying comprising an additive having foaming properties, foaming properties and dispersibility, wherein the material after kneading the amorphous refractory for wet spraying and water and / or an aqueous solution contains bubbles. Pertains to irregular shaped refractories.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The amorphous refractory for wet spraying of the present invention can contain stable fine air, that is, bubbles after kneading a refractory material and a binder with water and / or an aqueous solution. Accordingly, sedimentation of the coarse particles in the refractory material, in particular, is suppressed, and the coarse particles and the fine powder, and the solid content and the moisture in the kneaded material are hardly separated. In addition, by containing stable fine air and air bubbles, the viscosity after kneading is reduced, so that the pressure resistance is reduced, and stable construction is possible even during long distance pressure feeding. Further, since the viscosity can be reduced, a homogeneous kneaded material can be supplied and the curing accelerator can be uniformly mixed at the time of spraying, so that a more uniform construction body is obtained and cracks and peeling damage are less likely to occur. Further, since the pressure can be fed with a low moisture content due to a decrease in viscosity, a dense construction body is obtained, and the durability is improved.

The additive having air entrainment, foaming and foaming properties used in the amorphous refractory for wet spraying of the present invention may be any additive having air entrainment, foaming or foaming properties. Anything can be used. In particular, among alkyl sulfates, alkylbenzene sulfonates, polyoxyethylene alkyl ether sulfates, and fatty acid salts, those having air entrainment, foaming and foaming properties can provide stable fine air and bubbles. The effect is great for a long time. In addition, alkyl naphthalene sulfonates and paraffin sulfonates, polyethylene glycol fatty acid esters, alkyl betaines, and higher alcohol phosphates can also be used. Here, the compounding amount of the additive is in the range of 0.003 to 0.5% by weight based on 100% by weight of the total amount of the refractory material and the binder. If the amount of the additive is less than 0.003% by weight, there are few bubbles after kneading with water and / or an aqueous solution, and the pumping property is not improved. On the other hand, when the amount of the additive exceeds 0.5% by weight, there is no problem in the workability, but the air bubbles tend to be excessive, and the effect corresponding to the increase in the amount of the additive cannot be expected. Also, it is not preferable because the cost is increased.

In the present invention, air entrainment, foaming,
Additives having foaming properties and dispersibility can also be added. Such additives include, for example, bisphenolsulfonic acid condensate, naphthalenesulfonic acid formalin condensate, and ligninsulfonate having air entrainment, foaming, foaming and dispersing properties are stable and fine. The effect is great for a long time because air, that is, bubbles are obtained. In addition, aromatic sulfonic acid formalin condensate, sorbitan fatty acid ester, polyoxyethylene alkylamine, polyoxyethylene alkylphenyl ether, polyoxyethylene alkyl ether, and quaternary ammonium salt can also be used. Here, the compounding amount of the additive is 100% by weight of the total amount of the refractory material and the binder.
In the range of 0.005 to 0.5% by weight. If the amount of the additive is less than 0.005% by weight, water and / or
Alternatively, after kneading with an aqueous solution, there are few bubbles, and the pumping property is not improved. Further, when the amount of the additive exceeds 0.5% by weight, although there is no problem in workability, bubbles tend to be excessive, and an effect corresponding to an increase in the amount of the additive cannot be expected. Further, it is not preferable because the cost is increased.

These additives may be used in combination of two or more.

In the amorphous refractory for wet spraying of the present invention, an alumina cement or a thermosetting binder having an alumina content of 50% by weight or more can be used as a binder. Here, it is not preferable that the alumina content of the alumina cement is less than 50% by weight because the corrosion resistance is reduced. Thermosetting binders include starch, colloidal silica, silicates and phosphates that are hardly soluble in water, and thermosetting synthetic resin emulsions that have no curability at room temperature and can be cured by heating. Can be used. When alumina cement is used as the binder, the compounding amount is 25% by weight or less. Here, the compounding amount of the alumina cement is 25% by weight.
If it exceeds, it is not preferable because the corrosion resistance is reduced. When a thermosetting binder is used as the binder, the amount of the binder is 5% by weight or less. Here, if the blending amount of the thermosetting binder exceeds 5% by weight, it is not preferable because the corrosion resistance decreases.

As the refractory material of the amorphous type for wet spraying of the present invention, various commonly used refractory materials whose particle size has been adjusted to coarse or ultrafine powder can be used. For example,
Sintered alumina, fused alumina, bauxite, ban shale, mullite, kyanite, andalusite, chamotte, rhoite, quartzite, naturally occurring magnesite and its calcined products, seawater magnesia obtained from seawater and electrofusion Magnesia, alumina-magnesia composition spinel, electrofused spinel or alloy slag mainly composed of spinel minerals generated as a by-product during alloy refining, chromium ore, sintered or electrofused magnesia-chromium, zircon, zirconia, silicon carbide, graphite , Pitch, treated coke, etc., and bricks using them as raw materials (including post-use products).

Also, as other refractory materials, refractory clay,
Ultra-fine powder such as calcined alumina, ultra-fine powder magnesia, ultra-fine powder spinel of alumina / magnesia composition, ultra-fine titania, ultra-fine zirconia, ultra-fine chromia, fly ash, ultra-fine carbon such as carbon black, and ultra-fine boron carbide, Ultrafine silicon carbide powder can be used in combination.

Water is usually used for kneading the amorphous refractory for wet spraying of the present invention. However, when the refractory aggregate is not a basic material such as magnesia, an aqueous solution of silica sol, amine silicate, ethyl silicate or the like is used. Can also be used.

The coagulant added together with the air at the nozzle is not particularly limited, and any coagulant used in the wet spraying method can be used. For example, sodium silicate, potassium silicate and the like can be used. . Also, the amount of the coagulant added is not particularly limited, and the coagulant can be used in the range of 0.05 to 3.0% by weight in terms of solid content with respect to the amorphous refractory. The coagulant is preferably used in the form of an aqueous solution.

[0019]

EXAMPLES Inventive refractories for wet spraying of the products of the present invention and comparative products and cast materials of comparative products were obtained in the proportions shown in Tables 1 to 3 below. The properties of the obtained refractory for wet spraying of the product of the present invention and the comparative product and the casting material of the comparative product were evaluated according to the following methods: (1) Method of measuring pressure loss The outlet of the pressure pump and the tip of the pipe The pressure difference between the pressure gauge at the pump outlet and the pressure gauge near the pipe tip when the sample is pumped (usually the pressure near the pipe tip is lower than the pressure at the pressure pump outlet). Is reduced), and a pressure loss per meter of piping in the horizontal portion is determined from the pressure difference. (2) Presence or absence of separation About 2 kg of the kneaded sample is poured into a cylindrical container having a diameter of about 100 mm to make the surface horizontal. At this time, vibration is applied as necessary. Cover with a plastic bag so that the surface does not dry, and leave it for 1 hour. The presence or absence of separation is determined by whether or not water floats on the surface. (3) Adhesion rate A piston type pump with a maximum discharge rate of 10 m ³ / hour is used, and the piping is 1 m from the outlet (80 mm in diameter) of the pressure pump.
Squeeze to 50mm pipe diameter, pipe of 50mm diameter 20m
Connect, and reduce the pipe diameter to 40 mm with a length of 1 m.
A 0 m flexible hose is connected, a nozzle is attached to the hose, the sample is fed under pressure, and the adhesion rate is measured by spraying the castable panel at room temperature. About 100 kg of the sample after kneading and standing for 1 hour is used, and the adhesion ratio is calculated from the weight ratio of the rebound dross to the adhered substance. In the column of separation after 1 hour, "No pumping"
For the sample No., the results were obtained by blowing the sample immediately after kneading and spraying. (4) Apparent porosity of sprayed body The sprayed body obtained by the above method is 40 mm x 40 m.
It cuts out to mx 40 mm, and measures the apparent porosity of the construction body after drying at 110 degreeC for 24 hours. (5) Corrosion resistance index The sprayed construction obtained by the above method was processed and subjected to an erosion test at 1650 ° C. for 2 hours using a slag having a CaO / SiO ₂ weight ratio of 3 as an erosion agent by a rotating drum method.
The corrosion resistance index is indicated as an index when the comparative product 7 is set to 100. The smaller the numerical value of the corrosion resistance index, the better. The obtained results are also shown in Tables 1 to 3.

[0020]

[Table 1]

[0021]

[Table 2]

[0022]

[Table 3]

[0023]

As described above, the amorphous refractory for wet spraying of the present invention is an additive having air entrainment, foaming and foaming properties, or air entraining, foaming, foaming and dispersing properties. It is characterized in that it contains fine air in the material after kneading with water or colloidal silica because it contains an additive that has excellent separation resistance even if the kneaded material has low viscosity, and can be pumped over long distances. The pumping amount of the kneaded material is stable even under a high discharge pressure, the pumping performance is excellent, and the fine air does not remain during construction after spraying, and a dense structure can be formed. This has the effect of obtaining the same durability as the construction.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F27D 1/16 F27D 1/16 W (72) Inventor Hisaharu Sasaki 4-7-1 Kudankita, Chiyoda-ku, Tokyo No. Shinagawa Shiro Brick Co., Ltd. (72) Inventor Ichiro Hattori 4-7, Kudankita, Chiyoda-ku, Tokyo F-term (reference) 4G033 AA02 AA12 AA24 AB02 AB04 AB21 AB23 BA02 4K051 AA00 AA01 AA02 AA05 BE03 LA11

Claims (4)

[Claims] 1. An amorphous refractory for wet spraying which is obtained by kneading a refractory material, a binder, and water and / or an aqueous solution whose particle size has been adjusted to coarse or ultrafine powder as essential components,
The amorphous refractory for wet spraying contains an additive having air entrainment, foaming and foaming properties, and the material after kneading the amorphous refractory for wet spraying with water and / or an aqueous solution reduces bubbles. An amorphous refractory for wet spraying characterized by containing. 2. The air entraining, foaming and foaming additive is selected from the group consisting of alkyl sulfates, alkyl benzene sulfonates, polyoxyethylene alkyl ether sulfates and fatty acid salts.
2. The composition for wet spraying according to claim 1, wherein the amount of the additive is at least 0.003 to 0.5% by weight based on 100% by weight of the total amount of the refractory material and the binder. Irregular refractories. 3. An amorphous refractory for wet spraying, which comprises a refractory material, a binder, and water and / or an aqueous solution kneaded as coarse or ultrafine powder as essential components.
A material after kneading an amorphous refractory for wet spraying with an additive having air entrainment, foaming, foaming and dispersing properties, and water and / or an aqueous solution. An amorphous refractory for wet spraying, characterized in that the refractory contains air bubbles. 4. The air entraining, foaming, foaming and dispersing additive is a bisphenolsulfonic acid condensate,
At least one selected from the group consisting of naphthalenesulfonic acid formalin condensate and ligninsulfonic acid salt,
The amount of the additive is 100% of the total amount of the refractory material and the binder.
The amorphous refractory for wet spraying according to claim 3, wherein the content is in the range of 0.005 to 0.5% by weight relative to the weight%.