JP6924579B2 - Wet spray refractory for hot metal containers and its construction method - Google Patents

Description

The present invention relates to a durable wet spray refractory used for lining or repairing a refractory in a hot metal vessel of a steel process.

In the steel process, hot metal pretreatment equipment such as hot metal mills, hot metal pots, KR (Kambara Reactor), and hot metal containers such as hot metal storage furnaces are used for transporting, storing, and refining hot metal. These hot metal containers are lined with refractories at the parts where high-temperature hot metal and slag come into contact or where the heat is received. As the refractory lining, various forms such as those in which a brick is constructed and those in which a pouring material is applied are appropriately selected. In addition, since the refractory lining is damaged as it is used, it is repaired or reconstructed as appropriate before use.

Wet spray refractories are widely used for refractory linings or repairs of hot metal containers. The wet spray refractory is a refractory obtained by adding a quick-setting agent to an amorphous refractory containing a fire-resistant powder raw material and a binder. In the construction method of the wet spray refractory, the kneaded product obtained by adding water to the amorphous refractory material and kneading it is pumped toward the nozzle through a pipe, and the kneaded product is kneaded just before the kneaded material reaches the tip of the nozzle. It is formed by adding a quick-setting agent to the inside and spraying it onto the object. The amount of the binder and the amount of added water are adjusted so that the kneaded product does not solidify during pumping, and the kneaded product is not molded even if it is sprayed as it is. Therefore, by adding a quick-setting agent immediately before spraying and rapidly advancing the bonding of the kneaded material due to the quick-setting property of the quick-setting agent, the sprayed refractory can be formed and applied to the surface of the object. In addition, the molded construction body hardens with the passage of time after spraying.

An aqueous solution of _{sodium aluminate (Na 2} O · Al ₂ O ₃ ) or sodium silicate (Na ₂ O · nSiO ₂ · mH ₂ O) is generally used as a quick-setting agent for wet spray refractories for hot metal containers. It has been. These quick-setting agents have sufficient quick-setting properties for construction, are chemically stable, and do not change their properties for a long period of time if stored in a closed container, so that they can be used stably.

_{On the other hand, a slaked lime slurry in which slaked lime (Ca (OH) 2} , calcium hydroxide) and water are mixed is known as a quick-setting agent for a wet spray refractory that is not for a hot metal container. As a quick-setting agent made of slaked lime slurry is excellent in work safety, for example, Patent Document 1 and Patent Document 2 disclose a quick-setting agent made of slaked lime slurry.

In Patent Document 1, _{it is a quick-setting agent obtained by dissolving calcium chloride (CaCl 2} ) in slaked lime slurry, and the total amount of the solid portion of slaked lime and calcium chloride is 46% by mass or more and 70% by mass or less in the quick-setting agent. A quick-setting admixture containing 1 Pa · S or less in viscosity is disclosed. It is said that the quick-setting admixture described in Patent Document 1 can suppress the fall of the construction body in the construction of the wet sprayed refractory and is less likely to cause transportation trouble.

In Patent Document 2, it is a quick-setting agent composed of a slaked lime slurry, and the concentration of slaked lime is 8% by mass or more, preferably 10% by mass to 20% by mass. Disclosed is a quick-setting agent in which the reactivity and the sedimentation rate of the slaked lime solid are adjusted to obtain excellent quick-setting property, and the solid of slaked lime is hard to settle and the concentration is stable.

Neither Patent Document 1 nor Patent Document 2 is particularly limited in the chemical composition of the amorphous refractory. For example, as an example of Patent Document 2, the combined content of alumina and mullite is 81% by mass, and as a fine powder raw material. A combination of refractory powder raw materials containing 7% by mass of calcined alumina and 5% by mass of evaporated silica is shown. Since mullite is _{a compound of Al 2} O ₃ and SiO ₂ , its chemical composition is only _{Al 2} O ₃ and SiO _2.

Japanese Unexamined Patent Publication No. 2014-65615 Japanese Unexamined Patent Publication No. 2014-101242

Wet-sprayed refractories lined in hot metal containers such as torpedo wagons are generated by melting and wear during transportation and processing of hot metal, oxidation that occurs in contact with the atmosphere at high temperatures, and repeated heating-cooling. Durability against peeling, etc. is required. However, although Patent Document 1 and Patent Document 2 show characteristics related to workability, they do not show durability, and in general, the durability of wet spray refractories is not good except for quick binders. In many cases, only standard refractories were verified, and the optimum combination of the amorphous refractory of the wet spray refractory and the quick-setting admixture was not always achieved.

When sodium aluminate or an aqueous solution of sodium silicate is used as a quick-setting compound, it _{contains sodium oxide (Na 2} O), Na ₂ O has a low melting point of 1132 ° C., and Al ₂ O _{3 is an amorphous refractory.} And SiO _2, and a compound having a melting point of less than 1000 ° C. is formed, which causes a problem of poor corrosion resistance.

If the slaked lime slurry with quick-setting admixture, slaked lime in lime slurry by being heated to 800 ° C. or higher in actual use apart paddles and water (H 2 _O), produces calcium oxide (CaO). Although CaO has a high melting point of 2570 ° C, _{there is a problem that it reacts with Al 2} O ₃ and SiO ₂ in an amorphous refractory to form a compound having a melting point lower than 1400 ° C.

In particular, according to the embodiment of Patent Document 2, the amorphous refractory is composed of only _{Al 2} O ₃ and SiO _2. Therefore, the above-mentioned _{reaction of Al 2} O ₃ , SiO _2, and CaO directly occurs, and there is a problem that many compounds having a low melting point are formed and the corrosion resistance is inferior.

Therefore, in order to solve these problems, the present inventor has conceived the optimum combination of the chemical composition of the amorphous refractory of the wet spray refractory and the quick-setting admixture, and the wet spray has excellent workability and durability in actual machine use. It led to the invention of refractories and construction methods.

The present invention has the following features in a wet spray refractory for a hot metal container obtained by adding a quick-setting admixture to an amorphous refractory containing a fire-resistant powder raw material and a binder, or a method for constructing the same.

(1) In a wet spray refractory for a hot metal container formed by adding a quick-setting admixture to an amorphous refractory containing a fire-resistant powder raw material and a binder, the amorphous refractory contains 7% by mass of a SiC component. It contains 15% by mass or less _{and 40% by mass or more and 70% by mass or less of the Al 2} O ₃ component, and the refractory agent contains 10% by mass or more and 40% by mass or less of refractory lime and has a calcium chloride content of 20. It is composed of a slaked lime slurry having a mass% or less (including 0), and the amount of the quick-setting admixture added is 0.5% by mass or more and 2.5% by mass or less with respect to the amorphous refractory. Wet spray refractory for hot metal containers.

(2) The wet spray refractory for a hot metal container according to (1), wherein the amorphous refractory contains 5% by mass or less of the C component.

(3) The quick-setting agent is characterized by comprising a slaked lime slurry containing 10% by mass or more and 40% by mass or less of slaked lime and 5% by mass or more and 10% by mass or less of calcium chloride (1) or (2). ) For wet sprayed refractories for hot metal containers.

(4) In the method for constructing a wet spray refractory for a hot metal container according to any one of (1) to (3), a kneaded product obtained by adding water to the amorphous refractory and kneading the refractory is nozzleed through a pipe. A method for constructing a wet spray refractory for a hot metal container, which comprises adding the quick-setting agent to the kneaded product immediately before the kneaded product reaches the tip of a nozzle.

(5) The method for constructing a wet spray refractory for a hot metal container according to (4), wherein the quick-setting admixture is heated to 30 ° C. or higher and lower than 60 ° C. and then added to the kneaded product. ..

According to the optimum blending of the amorphous refractory and the slaked lime slurry in which the composition of the present invention is adjusted _{, the reaction between the slaked lime and Al 2} O ₃ and SiO ₂ can be suppressed by SiC in the amorphous refractory, so that excellent corrosion resistance can be obtained. A wet spray refractory that has an effect of suppressing oxidative damage, which will be described later, and exhibits excellent workability and durability when used in a hot metal container can be obtained.

The present invention is characterized in that the amorphous refractory contains SiC in an amount of 7% by mass or more and 15% by mass or less . SiC has a property that it is difficult to form a compound with CaO at a high temperature, and it is difficult to get wet with the liquid phase of the oxide formed by the reaction of _{Al 2} O ₃ , SiO _{2, and CaO.} By the presence of SiC around a refractory powder raw material other than SiC in an amorphous refractory (hereinafter, the refractory powder raw material is also referred to as a refractory powder), it is referred to as a refractory powder. _{It hinders the contact of CaO or the oxide with the liquid phase, and the formation of Al 2 O 3} , SiO _2, and Ca O, which is a problem when the refractory slurry is used as a quick-setting agent, does not proceed easily.

Further, when the present inventor actually used the wet spray refractory of the present invention and observed in detail the vicinity of the operating surface (the surface in contact with hot metal or molten slag), the compound of _{Al 2} O ₃ , SiO _{2, and CaO was observed.} It was confirmed that SiC was not oxidized inside the film, and it was found that the present invention has excellent oxidation resistance. This is because SiC is oxidized near the working surface to generate _{SiO 2 , which reacts with the surrounding Al 2} O ₃ and Ca O, but the compound suppresses the diffusion of oxygen in the atmosphere to the inside. It can be said that it is an effect.

In order to obtain the above-mentioned effect by containing SiC, it is necessary to contain 3% by mass or more of SiC. If the content of SiC is less than 3% by mass, it is too small to obtain the effect of suppressing the reaction of _{Al 2} O ₃ , SiO _{2, and Ca O.} Further, when SiC is contained in an amount of more than 30% by mass, the kneadability of the amorphous refractory is deteriorated. Therefore, the content of SiC in the amorphous refractory is 3% by mass or more and 30% by mass or less, preferably 7% by mass or more and 15% by mass or less.

The present invention is characterized in that the amorphous refractory contains 40% by mass or more and 70% by mass or less _{of the Al 2} O _{3 component.} Al ₂ O ₃ has a high melting point and is excellent in chemical stability even at high temperatures, and the durability of the present invention can be obtained by containing 40% by mass or more. However, Al ₂ O ₃ has a high coefficient of thermal expansion, and if the content is too large, the durability against thermal shock is inferior. Therefore, _{the content of Al 2} O ₃ is 70% by mass or less, preferably 40% by mass. It is 55% by mass or less.

The amorphous refractory of the present invention _{mainly contains SiO 2} as a chemical component other than _{SiC and Al 2} O ₃ . In _{addition to SiO 2} , it contains components such as CaO and metals contained in additives such as binders.

Further, it is more preferable that the amorphous refractory of the present invention contains 5% by mass or less of C (carbon). C has a property that it does not easily react with CaO, and an effect similar to the above-mentioned effect of SiC can be obtained. However, since C has extremely poor wettability with water as compared with others, and if it is contained too much, the fluidity of the kneaded product is significantly deteriorated. Therefore, it is preferably 5% by mass or less.

The quick-setting agent of the present invention is characterized by comprising a slaked lime slurry containing 10% by mass or more and 40% by mass or less of slaked lime. A slaked lime slurry is a solid-liquid mixture in which slaked lime is not completely dissolved in water and solid slaked lime and water are mixed to become cloudy. The concentration of slaked lime in the slaked lime slurry of the present invention is 10% by mass or more and has a rapid binding property. If the concentration of slaked lime in the slaked lime slurry exceeds 40% by mass, it becomes difficult to obtain the fluidity of the slaked lime slurry, so that it becomes difficult to add it to the kneaded product, more preferably 15% by mass or more and 20% by mass or less. be. Further, the slaked lime slurry does not have to be specially treated, and may be a general one used as an acidic wastewater neutralizer.

The present invention is characterized in that the amount of the quick-setting admixture added to the amorphous refractory is 0.5% by mass or more and 2.5% by mass or less. In order to exhibit the rapid binding action, an addition amount of 0.5% by mass or more is required. On the other hand, if the amount added is too large, the amount of water will also increase and the possibility of sagging of the sprayed body will increase, and more CaO will be generated during actual use. There is a need to. It is preferably 0.7% by mass or more and 2.0% by mass or less.

Further, the quick-setting agent of the present invention comprises a slaked lime slurry containing 10% by mass or more and 40% by mass or less of slaked lime, and by containing 20% by mass or less of calcium chloride, the quick-setting action of the slaked lime slurry can be enhanced. .. When calcium chloride exceeds 20% by mass, the time required to reach the required strength increases. The reason why the time required for strength development increases when the amount of calcium chloride added exceeds 20% by mass is not clear, but it is considered that calcium chloride has an effect of preventing the curing of the binder of the amorphous refractory.

More preferably, calcium chloride is in the range of 5% by mass or more and 10% by mass or less. Further, by optimally containing calcium chloride, the amount of the quick-setting admixture added can be reduced, and the amount of the quick-setting admixture added to the amorphous refractory is preferably 0.5% by mass or more and 1.2% by mass or less. Is.

Examples of the refractory powder of the amorphous refractory of the present invention include raw materials and silica stones containing _{Al 2} O _{3 as a main component, such as fused alumina, sintered alumina, bauxite, diaspore, slag rock and calcined alumina. Raw materials containing SiO 2} as the main components such as silica sand, silica flower, and refractory silica, _{and Al 2} O ₃ and SiO ₂ as the main components such as wax stone, chamotte, clay, andalucite, sillimanite, kayanite, and mulite. One or more selected from the raw materials are used, and further, a silicon dioxide raw material and a carbon raw material are combined to obtain a predetermined chemical composition of an amorphous refractory.

It is preferable that the particle size (degree of fineness of particles) of the refractory powder is appropriately adjusted in consideration of the fluidity at the time of construction, the adhesiveness at the time of spraying, and the fineness of the construction body. The silicon carbide raw material is preferably present evenly in the amorphous refractory, preferably has a finer particle size than other refractory powders, and specifically, it is preferable to use a material having a particle size of 0.5 mm or less.

The type and content of the binder for the amorphous refractory of the present invention are not particularly limited, but it is preferable to use alumina cement in an amount of 2% by mass or more and 10% by mass or less in terms of workability. Examples of the binder other than alumina cement include aluminum lactate, calcium lactate, water-hard alumina, phosphate, silicate and the like, and can be used in place of or in combination with alumina cement.

Examples of the inclusions other than the binder of the amorphous refractory include dispersants, organic fibers, thickeners, metals and the like. These are contained for the purpose of adjusting various properties such as fluidity and dryness of amorphous refractories. If the amount of these substances is too large, the durability may be deteriorated. Therefore, the content thereof is preferably 5% by mass or less in the amorphous refractory.

In the wet spray refractory of the present invention, a kneaded product obtained by adding water to an amorphous refractory and kneading it is pressure-fed toward a nozzle through a pipe, and the kneaded material is sent immediately before the kneaded material reaches the tip of the nozzle. A quick-setting agent is added to the pipe and sprayed.

The amount of water added to the amorphous refractory is appropriately adjusted according to the composition of the amorphous refractory. The more water there is, the easier it is to obtain flow during pumping and the better the workability. On the other hand, the less water there is, the better the durability. A suitable range is 7% by mass or more and 15% by mass or less with respect to the amorphous refractory.

Further, the construction equipment such as the kneader and the pumping machine used for the construction of the present invention is not particularly limited. Examples of the kneading machine include a general paddle mixer and a two-axis mixer, and examples of the pumping machine include a squeeze type, a snake type, and a piston type.

At the time of construction, it is preferable that the quick-setting admixture of the present invention is heated to 30 ° C. or higher and lower than 60 ° C. and added to the kneaded product. By warming and adding the quick-setting agent, the quick-setting action is enhanced, and the effect is exhibited at 30 ° C. or higher. However, if the temperature is raised to 60 ° C. or higher, the working environment deteriorates, so that the temperature is preferably lower than 60 ° C.

The wet spray refractory of the present invention was used as an example, and the conventional wet spray refractory was used as a comparative example, and was used for repairing the refractory lining of a torpedo wagon in a steel process. The refractory material lined in the torpedo wagon was cooled to a temperature at which repair work was possible and repaired every 200ch (charge) operation.

In this example, when repairing the refractory lining on the torpedo wagon, a wet spray refractory was applied to the surface of the damaged wear lining, and the quick connection, the time required for curing, and the durability were investigated.

The operating conditions of the targeted torpedo wagon will be explained. The torpedo wagon was a hot metal container that conveys and processes about 450 tons of hot metal per channel. The content of the treatment is mainly de-Si treatment, in which gaseous oxygen (O ₂ ) and solid iron oxide (Fe ₂ O ₃ etc.) are blown into the hot metal to oxidize the Si in the hot metal. Was to be removed. De-Si process intended to reduce ^10-2% by weight of Si concentration in the molten iron per 1ch on average, the processing time is about 15 minutes, implementation rate of the treatment was about 65%. When the Si removal treatment was not performed, the hot metal was mainly transported. The torpedo wagon operated 2 to 4 channels per day, and repairs were appropriately performed every 200 channels of operation.

_{The refractory lining of the torpedo wagon has an Al 2} O _3- SiC-C quality standard brick on the inside (hot metal side) _{as a wear lining and an Al 2} O _{3- SiO 2} quality standard on the outside (iron skin side). It was constructed using brick as a perma lining. Thus the surface of applying a wet spraying refractory in this example was a surface of the sized bricks of damaged Al ₂ O ₃ -SiC-C protein.

Hereinafter, wet spray refractories of Examples and Comparative Examples and their construction methods will be described.

The amorphous refractories of the wet spray refractories of Examples and Comparative Examples include Al ₂ O ₃ , SiC, SiO ₂ , and C in Examples 1 to 9 and Comparative Example 1 to Comparative Examples of Tables 1 to 4. The combination and amount of refractory powder raw materials were adjusted so as to have the chemical composition shown in 10. As the refractory powder raw material, fused alumina, bauxite, mullite, pyrophyllite, silica stone, silicon carbide, and carbon pitch were appropriately selected. These refractory powder raw materials were adjusted to increase the filling rate by combining several types of particle sizes. However, the particle size of silicon carbide was adjusted so that the particle size was 0.5 mm or less.

The binders of Examples and Comparative Examples were all alumina cement, and the content in the amorphous refractory was 5% by mass.

As for the composition of the quick- setting agent, Examples 1 and 2 and Reference Examples 3 to 5 were made into a slaked lime slurry having 18% by mass of slaked lime and 9% by mass of calcium chloride . Examples 6 to 9 were adjusted to the composition of the quick-setting agent shown in Table 2.

In Comparative Examples 1 to 4, the composition and the amount of the quick-setting admixture added were the same as those in Example 1, and the chemical composition of the amorphous refractory was adjusted outside the specification of the present invention. Further, in Comparative Examples 5 to 10, the chemical composition of the amorphous refractory was the same as that of Example 1, and any of the type, composition, and addition amount of the quick-setting admixture was adjusted outside the specification of the present invention.

The construction method will be explained. The construction method was the same for all the examples and comparative examples.

First, a predetermined amount of amorphous refractory was kneaded with a twin-screw mixer. The amount of water added was adjusted so that the fluidity required for pumping could be obtained by observing the condition of each amorphous refractory. Next, the obtained kneaded product was put into a squeeze pump type pumping device and pumped.

The quick-setting admixture was pumped using another pump. When a slaked lime slurry was used as the quick-setting agent, the precipitated solid content was sufficiently stirred in advance. The amount of the quick-setting admixture added was the amount shown in Tables 1 to 4, and was adjusted by controlling the pump for the quick-setting admixture with an inverter. The kneaded product and the quick-setting admixture were mixed with compressed air at the tip of the spraying nozzle. The nozzle was held by the operator and installed on the target surface.

As an evaluation of the quick connection at the time of construction, it was confirmed whether or not a construction body having a thickness of 200 mm could be formed on a vertical surface. At this time, if there is a lack of quick connection or the like, a fall occurs and the construction body is not formed.

Next, the time required for curing was measured by leaving it to stand after construction. The degree of hardening was determined by measuring the penetration resistance value (index) of the construction body using a Yamanaka soil hardness tester. To briefly explain the Yamanaka soil hardness tester, it is a hardness tester that utilizes the characteristic that a conical cone is pressed against an object through a spring to penetrate the object, and the harder the object, the smaller the penetration depth of the cone. Conventionally, the present inventor has empirically determined that the work piece is sufficiently hardened when the penetration resistance value measured by the Yamanaka soil hardness tester is 30 or more. In this embodiment, the penetration resistance value is measured every 15 minutes after the sprayed refractory is applied, and the time required to exceed 30 is defined as the time required for curing, and if it is within 120 minutes, the workability is improved. Judged to be excellent. The ambient temperature at the time of construction was 15 ° C to 18 ° C.

After the construction, it was naturally cured for 12 hours and then dried for 48 hours.

The durability of the wet spray refractory obtained by the above construction was evaluated. The evaluation target was the part constructed on the slag line (the part that comes into contact with the molten slag) of the torpedo wagon with a thickness of 150 mm. The time point was evaluated as a durable ch. The larger the durable ch, the better the durable.

Hereinafter, the evaluation results of each example will be described.
Examples 1 and 2 are preferred examples of the present invention. The curing time was as short as 30 minutes, and the workability was excellent. It is considered that this is because the slaked lime slurry of the quick-setting admixture appropriately contained calcium chloride, and thus excellent workability was exhibited even with a relatively small amount of the quick-setting admixture added. Moreover, it was confirmed that the durable ch was 100 ch, which was excellent.

Reference Example 3 is an example in which the content of SiC is 3% by mass and _{the content of Al 2} O ₃ is the upper limit. Reference Example 4 is an example in which the content of SiC is 30% by mass. Reference Example 5 is an example in which the content of SiC is 20% by mass and the content of C is 5% by mass. Reference Example 3 had a short curing time of 30 minutes and was excellent in workability. It was confirmed that Reference Example 4 and Reference Example 5 have superior durability with 110 and 105 channels, respectively, as compared with Example 1 and Example 2. It is considered that the reason why Reference Example 4 or Reference Example 5 had excellent durability was that SiC or C having excellent corrosion resistance to slag was contained in a larger amount than in Examples 1 and 2.

Example 6 is an example in which calcium chloride is not contained in the slaked lime slurry as compared with Example 1, the amount of the quick-setting agent added is increased, and the quick-setting agent is added without heating. The curing time was as short as 15 minutes, and the workability was excellent. Although the durable ch was inferior to that of Example 1, it was confirmed that the durable ch was 90 ch.

Example 7 is an example in which the slaked lime content of the slaked lime slurry is reduced as compared with Example 6.
The time required for curing was longer than that of Example 6. Moreover, the durable ch was 100 ch, which was an excellent durable. It is considered that the reason why Example 7 had excellent durability is that the low slaked lime content means that the amount of CaO is low and the durability is unlikely to be lowered by the compound having a low melting point.

Example 8 was an example in which the slaked lime content of the slaked lime slurry was increased as compared with Example 1, and the time required for curing was as short as 15 minutes, and the workability was excellent. In addition, the durable ch was inferior to that of Example 1. It is considered that this is because Example 8 has a larger amount of slaked lime of 40% by mass than that of Example 1, so that the amount of CaO is large and the durability is lowered due to the compound having a low melting point. Example 8 had an inferior durability to that of Example 1, but had an excellent durability of 80 channels.

Example 9 is an example in which the content of calcium chloride in the slaked lime slurry was increased and the amount of the quick-setting admixture added was decreased as compared with Example 1, and the time required for curing was longer than in Example 1. The durable ch was inferior to that of Example 1, but the durable ch was 90 ch, which was excellent.

Comparative Example 1 is an example in which SiC is not contained and is inferior in durability. It is considered that this did not contain SiC and the above-mentioned effect of SiC was not obtained.

Comparative Example 2 is an example in which the Al ₂ O ₃ content exceeds 70% by mass, and the service is inferior. It is considered that this is because _{the expansion amount of Al 2} O ₃ was too large and the Al 2 O 3 was peeled off due to thermal expansion.

Comparative Example 3 is an _{example in which the content of Al 2} O ₃ is too small, and the service is inferior. It is considered that the excellent corrosion resistance _{of Al 2} O _{3 was not obtained.}

Comparative Example 4 is an example in which the SiC content is too large, the time required for curing is long, the workability is inferior, and the durability is inferior. It is considered that this is because SiC has a property of being hard to get wet with water, so that the amount of water added increases during irregular kneading, and a precise construction body cannot be obtained.

Comparative Example 5 is an example in which the slaked lime concentration in the slaked lime slurry of the quick-setting agent exceeds the upper limit of the present invention, and is inferior in durability. It is considered that this is because the amount of CaO generated in the wet spray refractory is too large and a compound having a low melting point is formed with _{Al 2} O ₃ and SiO _2.

Comparative Example 6 was an example in which sodium aluminate was applied to the quick-setting agent, and its durability was inferior. This is considered to be due to the influence _{of Na 2 O in sodium aluminate.}

Comparative Example 7 is an example in which the content of slaked lime in the slaked lime slurry is too small, and when the work was carried out to a thickness of 200 mm, the work piece was dropped, the time required for hardening was long, and the workability was inferior. Since it fell during construction, its durability could not be evaluated.

Comparative Example 8 is an example in which the content of calcium chloride in the slaked lime slurry is too large, the time required for curing is long, and the workability is inferior. The durable ch was 70 ch, which was inferior to the durable ch.

Comparative Example 9 is an example in which the amount of the quick-setting admixture added was too small, and when the work was carried out to a thickness of 200 mm, the work piece was dropped, the time required for curing was long, and the workability was inferior. Since it fell during construction, its durability could not be evaluated.

Comparative Example 10 is an example in which the amount of the quick-setting admixture added is too large, and when the work is carried out to a thickness of 200 mm, the work piece drips and the workability is inferior. It is considered that this is because the water content of the slaked lime slurry also increased at the same time as the amount of the quick-setting admixture added increased, so that the water content became too large. Durability could not be evaluated because the construction body fell off during construction.

As described above, the examples of the present invention showed excellent workability and durability.

Claims (5)

In a wet spray refractory for hot metal containers, which is made by adding a quick-setting admixture to an amorphous refractory containing a fire-resistant powder raw material and a binder.
Wherein the monolithic refractory, 15 wt% 7 wt% or more of SiC components less, _Al 2 _{O 3} component containing less than 70 wt% to 40 wt%,
The quick-setting agent comprises a slaked lime slurry containing 10% by mass or more and 40% by mass or less of slaked lime (calcium hydroxide) and having a calcium chloride content of 20% by mass or less (including 0).
A wet spray refractory for a hot metal container, wherein the amount of the quick-setting admixture added is 0.5% by mass or more and 2.5% by mass or less with respect to the amorphous refractory. The wet spray refractory for a hot metal container according to claim 1, wherein the amorphous refractory contains 5% by mass or less of the C component. The hot metal according to claim 1 or 2, wherein the quick-setting admixture comprises a slaked lime slurry containing 10% by mass or more and 40% by mass or less of slaked lime and 5% by mass or more and 10% by mass or less of calcium chloride. Wet spray refractory for containers. In the method for constructing a wet spray refractory for a hot metal container according to any one of claims 1 to 3.
The kneaded product obtained by adding water to the amorphous refractory and kneading the kneaded material is pressure-fed toward the nozzle through a pipe, and the quick-setting agent is added to the kneaded product immediately before the kneaded material reaches the tip of the nozzle. A method of constructing a wet spray refractory for hot metal containers. The method for constructing a wet spray refractory for a hot metal container according to claim 4, wherein the quick-setting admixture is heated to 30 ° C. or higher and lower than 60 ° C. and then added to the kneaded product.