Anti-segregation aluminum-silicon refractory castable containing aluminate cement as well as preparation method and application of anti-segregation aluminum-silicon refractory castable

Abstract

The invention belongs to the technical field of refractory castable, and particularly relates to an aluminate cement-containing segregation-preventing aluminum-silicon refractory castable as well as a preparation method and application of the aluminate cement-containing segregation-preventing aluminum-silicon refractory castable. The refractory castable is prepared from metakaolin and modified magnesium-aluminum hydrotalcite subjected to organic anion intercalation treatment, the total content of silicon dioxide and aluminum oxide of the metakaolin is larger than or equal to 92 wt%, the specific surface area of the metakaolin is larger than or equal to 600 m < 2 > / kg, the organic anion is any one of dodecyl sulfate radical and terephthalic acid radical, and the modified magnesium-aluminum hydrotalcite is modified magnesium-aluminum hydrotalcite subjected to organic anion intercalation treatment. The particle size D50 of the modified magnesium-aluminum hydrotalcite is greater than or equal to 1.5 microns, and the specific surface area is greater than or equal to 120m < 2 > / g.

Description

Technical Field

[0001] This application belongs to the field of refractory castable technology, and particularly relates to an anti-segregation aluminosilicate refractory castable containing aluminate cement, its preparation method and application. Background Technology

[0002] Aluminosilicate refractory castables refer to a class of unshaped refractory materials whose main chemical composition is alumina (Al2O3) and silicon dioxide (SiO2).

[0003] This refractory castable typically uses high-alumina bauxite, corundum, mullite, or silica fume as aggregates and matrix, exhibiting excellent high-temperature strength, thermal shock resistance, and chemical stability. It is widely used in various high-temperature kilns in industries such as metallurgy, building materials, power, and petrochemicals, including components like steel ladles, heating furnaces, and rotary kilns.

[0004] Among them, the aggregates in refractory castables differ significantly from fine powders in terms of density, particle size, and surface properties. Therefore, when refractory castables are mixed with water, pumped, or vibrated for molding, component segregation, or other phenomena, is prone to occur.

[0005] Segregation leads to uneven composition within the cast body, resulting in harmful phenomena such as aggregate enrichment or powder agglomeration in localized areas. This significantly reduces the material's density, strength uniformity, and service life. Segregation is particularly pronounced in large-volume or gravity-flow casting construction.

[0006] On the other hand, aluminate cement is a hydraulic cementitious material with calcium aluminate as the main mineral phase. It is often used as a binder in refractory castables. Its advantages are rapid early strength development, high mid-temperature strength, good compatibility with a variety of refractory raw materials, and rapid hardening at room temperature, which facilitates on-site construction.

[0007] However, traditional aluminate cement-bonded castables are prone to forming low-melting-point phases (such as anorthite and calcite) at high temperatures, which leads to a decrease in high-temperature performance. Simultaneously, cement hydration products are prone to generating numerous microcracks during drying and baking, affecting structural integrity. Furthermore, aluminate cement systems may exacerbate differences in slurry fluidity, indirectly inducing segregation.

[0008] Correspondingly, existing common methods for preventing segregation in aluminosilicate refractory castables mainly involve adding water-reducing agents and thickeners, as well as adjusting particle size distribution. However, these methods generally sacrifice the fluidity and workability of the castable, or make it difficult to balance early strength and high-temperature performance.

[0009] For example, the invention patent application with publication number CN120483692A and publication date of August 15, 2025 discloses an anti-alkali-return aluminate cement-bonded aluminosilicate refractory castable and its preparation method. The raw materials of the refractory castable include basic raw materials and admixtures. The admixtures include alkali inhibitors and water-reducing agents. The alkali inhibitors include mordenite zeolite or nano calcium carbonate.

[0010] The advantages of the aluminum-silicon refractory castable in this invention patent application are: the prepared refractory castable has high strength and excellent resistance to alkali erosion.

[0011] However, in practical applications, this aluminosilicate refractory castable still suffers from at least the following shortcomings in practicality and overall performance, specifically:

[0012] Its anti-segregation performance is insufficient; simply adding water-reducing agents to avoid segregation is far from enough. Summary of the Invention

[0013] This application provides an anti-segregation aluminosilicate refractory castable containing aluminate cement. The technical problem to be solved is: how to make the aluminosilicate refractory castable have both outstanding anti-segregation advantages and sufficient anti-alkali reversion performance.

[0014] In addition, this application also provides a method for preparing the above-mentioned refractory castable and an application of the above-mentioned refractory castable.

[0015] The technical solution adopted by this application to solve the above problems is: an aluminate-containing cement-based anti-segregation aluminosilicate refractory castable, the raw material composition of which includes: metakaolin and modified magnesium aluminum hydrotalcite treated with organic anion exchange.

[0016] The metakaolin has a total silica and alumina content of ≥92wt% and a specific surface area of ​​≥600m². 2 / kg,

[0017] The organic anion is either dodecyl sulfate or terephthalate, and the modified magnesium aluminum hydrotalcite has a particle size D50 ≥ 1.5 μm and a specific surface area ≥ 120 m². 2 / g.

[0018] A further preferred technical solution is that the raw material composition includes: aluminum-silicon aggregate, α-Al2O3 micro powder, metakaolin, aluminate cement, and modified magnesium-aluminum hydrotalcite.

[0019] A further preferred technical solution is that the raw material composition also includes polycarboxylate superplasticizer.

[0020] A further preferred technical solution is that the raw material composition includes the following components by weight:

[0021] Aluminum-silicon aggregate: 75-78%;

[0022] α-Al₂O₃ micro powder: 8.0-12.0%;

[0023] Metakaolin: 7.0-8.5%;

[0024] Aluminate cement: 2-5%;

[0025] Modified magnesium aluminum hydrotalcite: 0.2-0.4%;

[0026] Polycarboxylate superplasticizer: 0.1-0.3%.

[0027] A further preferred technical solution is that the aluminum-silicon aggregate is any one or a mixture of several of the following: high-alumina bauxite clinker, mullite aggregate, and charred gemstone clinker.

[0028] A further preferred technical solution is that the aluminate cement is a low-alkali aluminate cement, and the total content of Na2O and K2O is ≤0.5wt%.

[0029] A method for preparing an anti-segregation aluminosilicate refractory castable containing aluminate cement: before mixing and using the metakaolin and modified magnesium aluminum hydrotalcite, they are first dried until the moisture content is ≤0.5wt%.

[0030] The application of the aluminate-containing cement-based anti-segregation aluminosilicate refractory castable includes the following steps:

[0031] S1. Add water and mix: Add casting material and water to the mixing equipment and mix for 2-5 minutes to obtain a uniform slurry;

[0032] S2. Pouring and Vibration: The uniform slurry is poured into the construction area and vibrated to form the shape, with the vibration time controlled to be ≤60s.

[0033] S3. Curing and demolding: Under conditions of 10-35℃ and relative humidity ≥60%, allow to cure naturally for 12-48 hours, then demold.

[0034] S4. Air curing: After 24-72 hours of air curing, it can be put into use directly.

[0035] A further preferred technical solution is that, in S1, the water-to-material ratio during the water addition operation is 0.12-0.16.

[0036] A further preferred technical solution is that, in S2, the thickness of a single pour is 50-300mm, and the interval between adjacent pouring operations is ≤30min.

[0037] In this application, the anti-segregation mechanism of the refractory castable can be summarized as follows: the above-mentioned metakaolin and modified magnesium aluminum hydrotalcite work together to construct an "anti-settling cementing network" in situ.

[0038] The specific principle is as follows:

[0039] First, metakaolin exhibits volcanic ash activity, referring to the Ca released during the hydration of aluminate cement. 2+ Under high pH conditions, the amorphous SiO2 in metakaolin reacts rapidly to form CASH gel, namely calcium aluminum silicate hydrate.

[0040] Secondly, the gel has a nanofiber / network structure that encapsulates the aggregate and connects the micro powder, significantly improving the viscosity and yield stress of the slurry structure. This allows the slurry structure to effectively "support" the coarse aggregate even when it is in a static state, preventing sedimentation and achieving the purpose of preventing segregation.

[0041] Third, at the same time, modified magnesium aluminum hydrotalcite has a rheological regulation effect. That is, the modified magnesium aluminum hydrotalcite treated with organic anion intercalation slowly dissociates in water and releases positively charged layer fragments. These fragments are adsorbed on the surface of aggregates and micro powders, forming a dual barrier of "steric hindrance and electrostatic stability" to reduce particle agglomeration.

[0042] Fourth, the flaky morphology of the aforementioned layer fragments can physically hinder the relative movement of particles, further suppressing segregation.

[0043] Ultimately, the aforementioned CASH gel provides "chemical locking," while the modified magnesium aluminum hydrotalcite provides "physical barrier." Together, they achieve a relatively efficient anti-segregation effect.

[0044] In addition, it should be noted that no additional thickener is required during the process.

[0045] In this application, the anti-alkali reversion mechanism of the refractory castable can be summarized as: the synergistic effect of the "ion capture" function of the modified magnesium aluminum hydrotalcite and the "alkali fixation" function of metakaolinite.

[0046] The specific principle is as follows:

[0047] First, modified magnesium aluminum hydrotalcite has a typical layered double hydroxide (LDH) structure, which means it possesses the function of "alkali metal ion capture". In an alkaline environment, its structure can be partially dissolved and reassembled, capturing free Na+ ions. + K + Embedded in the crystal lattice or adsorbed onto the surface;

[0048] Secondly, and more importantly, the interlayer organic anions (such as the dodecyl sulfate ion mentioned above) can repel OH-. -Migration reduces the driving force for alkali metal ions to diffuse to the surface, which corresponds to the "ion trapping" function mentioned above.

[0049] Third, metakaolin and Ca 2+ The reaction, in the process of generating the above-mentioned CASH gel, consumes OH groups in the system. - This lowers the pH value of the solution;

[0050] Fourth, the generated CASH gel itself has low permeability, which hinders the migration of water carrying alkali metal ions to the surface;

[0051] Fifth, residual Al in metakaolin 3+ Compatible with Na + The formation of a poorly soluble sodium aluminosilicate phase (such as sodium zeolite precursor) further immobilizes the alkali.

[0052] Ultimately, the effects of the modified magnesium aluminum hydrotalcite can be summarized as "capturing and blocking," while the effects of the metakaolinite can be summarized as "consuming and solidifying." The two pathways work synergistically to suppress the alkali return phenomenon.

[0053] The beneficial effects of this application include at least the following three points.

[0054] First, this refractory castable can significantly suppress aggregate settlement and slurry segregation during construction and curing, with a segregation rate ≤2%. (YB / T 5202.1-2022, "Test Methods for Refractory Castables Part 1: Flowability and Segregation Resistance")

[0055] Secondly, this refractory castable can effectively inhibit surface efflorescence after curing, with an efflorescence area rate of ≤3% after 28 days. (GB / T 34168-2017, visual rating method)

[0056] Third, the batching operation, preparation method, and application method of this refractory castable have relatively high safety and outstanding practicality. Attached Figure Description

[0057] Figure 1 The table shows the average performance test results of the refractory castables in the four examples and five comparative examples.

[0058] Figure 2 This is a product photo of the refractory castable in Example 1.

[0059] Figure 3 These are construction photos of the refractory castable in Example 1.

[0060] Figure 4 for Figure 3 A magnified photo of a specific area. Detailed Implementation

[0061] The following description is merely a preferred embodiment of this application and is not intended to limit the scope of this application.

[0062] Example 1

[0063] An aluminate-containing cement-based anti-segregation aluminosilicate refractory castable, the raw material composition of which is as follows by weight:

[0064] Aluminum-silicon aggregate: 78%;

[0065] α-Al₂O₃ micro powder: 10%;

[0066] Metakaolin: 8%;

[0067] Aluminate cement: 3.5%;

[0068] Modified magnesium aluminum hydrotalcite: 0.4%;

[0069] Polycarboxylate superplasticizer: 0.1%.

[0070] Among them, the aforementioned aluminum-silicon aggregate is high-alumina bauxite clinker.

[0071] Among them, the total silica and alumina content of the above-mentioned metakaolin is ≥92wt%, and the specific surface area is ≥600m². 2 / kg.

[0072] The aluminate cement mentioned above is a low-alkali aluminate cement, with a total Na2O and K2O content of ≤0.5wt%.

[0073] The modified magnesium aluminum layered double hydroxide (MLD) mentioned above is a modified magnesium aluminum layered double hydroxide treated with dodecyl sulfate ion intercalation, with a particle size D50 ≥ 1.5 μm and a specific surface area ≥ 120 m². 2 / g.

[0074] The polycarboxylate superplasticizer mentioned above is in powder form with a solid content of 98%.

[0075] Specifically, the modified magnesium aluminum hydrotalcite treated with dodecyl sulfate ion intercalation can be a commercially available product or can be prepared by the following methods.

[0076] Step 1: Preparation of nitrate precursor solution

[0077] According to Mg 2+ ∶Al 3+ Magnesium nitrate hexahydrate and aluminum nitrate nonahydrate were weighed out in a molar ratio of 3:1 and dissolved in deionized water to prepare a mixed solution with a total metal ion concentration of 1.0-1.5 mol / L.

[0078] Step 2: Co-precipitation synthesis of carbonate-type hydrotalcite

[0079] Under nitrogen protection, the above mixed solution and 1.0 mol / L NaOH / Na2CO3 mixed alkaline solution were added dropwise to the reaction vessel in a co-current manner, with the pH controlled at 10.0 ± 0.2 and the temperature at 60-70℃.

[0080] After the addition is complete, continue crystallization at 70℃ for 12-18 hours;

[0081] Filter by suction, wash with deionized water until the pH of the filtrate is ≤8.0, and dry under vacuum at 60℃ to obtain CO3. 2- Type LDH-CO3 (magnesium aluminum hydrotalcite).

[0082] Step 3: Anion exchange modification

[0083] LDH-CO3 was dispersed in a 0.1-0.3 mol / L sodium dodecyl sulfate (SDS) solution at a solid-liquid ratio of 1 g: 50 mL.

[0084] Stir the reaction at 60-80℃ for 12-24 hours to allow CO3 to react. 2- Targeted organic anion (DS) - ) substitution;

[0085] Filter by suction and wash with warm water 3-5 times to remove free organic ions;

[0086] The modified magnesium aluminum hydrotalcite was obtained by vacuum drying at 60℃ and grinding through a 325-mesh sieve.

[0087] In the preparation method of this refractory castable, the metakaolin and modified magnesium aluminum hydrotalcite are dried before being mixed and used until the moisture content is ≤0.5wt%.

[0088] The application method of this refractory castable includes the following steps in sequence.

[0089] S1. Add water and mix: Add casting material and water to the mixing equipment and mix for 5 minutes to obtain a uniform slurry;

[0090] S2. Pouring and Vibration: The uniform slurry is poured into the construction area and vibrated to form the shape. The vibration time is 40 seconds.

[0091] S3. Curing and demolding: Under conditions of 10-35℃ and relative humidity ≥60%, allow to cure naturally for 24 hours, then demold.

[0092] S4. Air curing: After 48 hours of air curing, it can be put into use directly.

[0093] In S1, the water-to-material ratio for the water-addition operation is 0.14.

[0094] In S2, the thickness of a single pour is 120mm, and the interval between adjacent pouring operations is ≤30min.

[0095] Example 2

[0096] The refractory castable in this embodiment, as well as its preparation and application methods, differ from those in Embodiment 1 in only the following three aspects.

[0097] First, the aluminum-silicon aggregate consists of mullite aggregate and coke clinker, with a weight ratio of 1:1.

[0098] Second, the organic anion in the modified magnesium aluminum hydrotalcite treated with organic anion intercalation is terephthalate ion.

[0099] Third, the raw material composition consists of the following components by weight.

[0100] Aluminum-silicon aggregate: 76%;

[0101] α-Al2O3 micro powder: 12%;

[0102] Metakaolin: 8%;

[0103] Aluminate cement: 3.6%;

[0104] Modified magnesium aluminum hydrotalcite: 0.3%;

[0105] Polycarboxylate superplasticizer: 0.1%.

[0106] Example 3

[0107] The refractory castable in this embodiment, as well as its preparation and application methods, differ from those in Embodiment 1 in only the following two aspects.

[0108] First, the aluminum-silicon aggregate consists of high-alumina bauxite clinker and mullite aggregate, with a weight ratio of 1:1.

[0109] Second, the raw material composition consists of the following components by weight.

[0110] Aluminum-silicon aggregate: 77%;

[0111] α-Al2O3 micro powder: 12%;

[0112] Metakaolin: 7%;

[0113] Aluminate cement: 3.6%;

[0114] Modified magnesium aluminum hydrotalcite: 0.3%;

[0115] Polycarboxylate superplasticizer: 0.1%.

[0116] Example 4

[0117] The refractory castable in this embodiment, as well as its preparation and application methods, differ from those in Embodiment 1 in only one aspect.

[0118] The raw material consists of the following components by weight:

[0119] Aluminum-silicon aggregate: 77%;

[0120] α-Al₂O₃ micro powder: 11%;

[0121] Metakaolin: 8.5%;

[0122] Aluminate cement: 3%;

[0123] Modified magnesium aluminum hydrotalcite: 0.4%;

[0124] Polycarboxylate superplasticizer: 0.1%.

[0125] Comparative Example 1

[0126] The refractory castable in this comparative example, as well as its preparation and application methods, differ from those in Example 1 in only one aspect, as follows.

[0127] The aforementioned metakaolin is not added; instead, it is replaced with an equal weight of α-Al2O3 micro powder.

[0128] Among them, α-Al2O3 micro powder is chemically inert and has physical properties similar to metakaolin. It only compensates for volume / mass and does not participate in the reaction.

[0129] Comparative Example 2

[0130] The refractory castable in this comparative example, as well as its preparation and application methods, differ from those in Example 1 in only one aspect, as follows.

[0131] The modified magnesium aluminum hydrotalcite mentioned above is not added; instead, it is replaced with an equal weight of α-Al2O3 micro powder.

[0132] Comparative Example 3

[0133] The refractory castable in this comparative example, as well as its preparation and application methods, differ from those in Example 1 in only one aspect, as follows.

[0134] The aforementioned metakaolin and modified magnesium aluminum hydrotalcite are not added; instead, they are replaced with an equal weight of α-Al2O3 micro powder.

[0135] Comparative Example 4

[0136] The refractory castable in this comparative example, as well as its preparation and application methods, differ from those in Example 1 in only one aspect, as follows.

[0137] The above-mentioned modified magnesium aluminum hydrotalcite was replaced with ordinary CO3. 2- The type of magnesium aluminum hydrotalcite, i.e., without intercalation treatment.

[0138] Comparative Example 5

[0139] The refractory castable in this comparative example, as well as its preparation and application methods, differ from those in Example 1 in only one aspect, as follows.

[0140] In the above modified magnesium aluminum hydrotalcite, the organic anions are replaced by Cl. - That is, the synthesis of Cl - It is a type of LDH, no longer an organic anionic LDH.

[0141] Performance testing

[0142] Attached Figure 1 The five test items are: segregation rate (%), 28-day efflorescence area ratio (%), room temperature flexural strength (MPa), room temperature compressive strength (MPa), and flow value (mm). Sampling tests were conducted on the above four examples and five comparative examples. Each data point for each example / comparative example was tested at least three times, and the average value was recorded in the appendix. Figure 1 In the table.

[0143] The specific reference standards for the above tests are as follows.

[0144] Segregation rate (%): YB / T 5202.1-2022, "Test Methods for Refractory Castables - Part 1: Flowability and Segregation Resistance"

[0145] 28-day efflorescence area rate (%): GB / T 34168-2017, visual rating method

[0146] Flexural strength at room temperature (MPa): Appendix A (Mechanical properties at room temperature) of GB / T 30873-2014 "Test Methods for Thermal Shock Resistance of Refractory Materials"

[0147] Compressive strength at room temperature (MPa): Appendix A (Mechanical properties at room temperature) of GB / T 30873-2014 "Test Methods for Thermal Shock Resistance of Refractory Materials"

[0148] Flow value (mm): YB / T 5202.1-2022 (jump table method)

[0149] Test Result Analysis

[0150] First, both metakaolin and modified magnesium aluminum hydrotalcite are indispensable:

[0151] The significantly increased segregation rate in Comparative Example 1 indicates that the CASH gel formed by metakaolinite is crucial for inhibiting sedimentation; the alkali return rate in Comparative Example 2 reached 8.7%, proving that the modified magnesium aluminum hydrotalcite is the core component for capturing alkali metal ions.

[0152] Secondly, metakaolin and modified magnesium aluminum hydrotalcite have a synergistic effect:

[0153] In Comparative Example 3, the removal of both of these factors resulted in a sharp deterioration in both segregation rate and alkali return rate, far exceeding the sum of Comparative Examples 1 and 2. This indicates a positive coupling mechanism between metakaolinite (function: alkali fixation + gelation) and modified hydrotalcite (function: alkali capture + barrier).

[0154] Third, organic anionic intercalation modification is irreplaceable:

[0155] Although Comparative Examples 4 and 5 retained the LDH structure, their alkali return rates were still as high as 9–10%, indicating that only large molecular organic anions (such as DS) could achieve this. - TPA 2- Only then can OH be effectively blocked. - Migrate and stabilize the layered structure.

[0156] Fourth, the formula has wide adaptability:

[0157] Examples 1-4, using different aluminum-silicon aggregates and adjusting the proportions, all simultaneously met the requirements of segregation rate ≤2% and alkali return rate ≤3%, proving that the technical solution of the present invention has good industrial applicability.

[0158] Fifth, core performance improvement without sacrificing basic performance:

[0159] The room temperature strength and flowability of all embodiments are at the industry standard level, indicating that the realization of the "anti-segregation + anti-alkali return" function is not at the expense of workability or mechanical properties.

[0160] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this application. These are non-inventive modifications and are protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. A type of aluminate-containing cement-based anti-segregation aluminosilicate refractory castable, characterized in that... The raw material composition includes: metakaolin and modified magnesium aluminum hydrotalcite treated with organic anion intercalation. The metakaolin has a total silica and alumina content of ≥92wt% and a specific surface area of ​​≥600m². 2 / kg, The organic anion is either dodecyl sulfate or terephthalate, and the modified magnesium aluminum hydrotalcite has a particle size D50 ≥ 1.5 μm and a specific surface area ≥ 120 m². 2 / g.

2. The aluminate-containing cement-based anti-segregation aluminosilicate refractory castable according to claim 1, characterized in that... The raw material composition includes: aluminum-silicon aggregate, α-Al2O3 micro powder, metakaolin, aluminate cement, and modified magnesium-aluminum hydrotalcite.

3. The aluminate-containing cement-based anti-segregation aluminosilicate refractory castable according to claim 2, characterized in that: The raw material composition also includes polycarboxylate superplasticizer.

4. The aluminate-containing cement-based anti-segregation aluminosilicate refractory castable according to claim 3, characterized in that... The raw material composition includes the following components by weight: Aluminum-silicon aggregate: 75-78%; α-Al₂O₃ micro powder: 8.0-12.0%; Metakaolin: 7.0-8.5%; Aluminate cement: 2-5%; Modified magnesium aluminum hydrotalcite: 0.2-0.4%; Polycarboxylate superplasticizer: 0.1-0.3%.

5. The aluminate-containing cement-based anti-segregation aluminosilicate refractory castable according to claim 2, characterized in that: The aluminum-silicon aggregate is any one or a mixture of several of the following: high-alumina bauxite clinker, mullite aggregate, and charred gemstone clinker.

6. The aluminate-containing cement-based anti-segregation aluminosilicate refractory castable according to claim 2, characterized in that: The aluminate cement is a low-alkali aluminate cement with a total Na2O and K2O content of ≤0.5wt%.

7. A method for preparing an anti-segregation aluminosilicate refractory castable containing aluminate cement as described in any one of claims 1-6, characterized in that: Before mixing and using the metakaolin and modified magnesium aluminum hydrotalcite, they are first dried until the moisture content is ≤0.5wt%.

8. The application of an anti-segregation aluminosilicate refractory castable containing aluminate cement as described in any one of claims 1-6, characterized in that... The application method includes the following steps in sequence: S1. Add water and mix: Add casting material and water to the mixing equipment and mix for 2-5 minutes to obtain a uniform slurry; S2. Pouring and Vibration: The uniform slurry is poured into the construction area and vibrated to form the shape, with the vibration time controlled to be ≤60s. S3. Curing and demolding: Under conditions of 10-35℃ and relative humidity ≥60%, allow to cure naturally for 12-48 hours, then demold. S4. Air conditioning: After 24-72 hours of air conditioning, it can be put into use directly.

9. The application of the aluminate-containing cement anti-segregation aluminosilicate refractory castable according to claim 8, characterized in that: In S1, the water-to-material ratio for the water-addition operation is 0.12-0.

16.

10. The application of the aluminate-containing cement anti-segregation aluminosilicate refractory castable according to claim 8, characterized in that: In S2, the thickness of a single pour is 50-300mm, and the interval between adjacent pouring operations is ≤30min.

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