Lightweight self-flowing insulating castable based on modified aggregate and preparation method thereof

Abstract

This invention relates to a lightweight self-flowing thermal insulation castable based on modified aggregates, comprising the following raw materials in parts by weight: 40-50 parts modified expanded perlite, 8-12 parts mullite hollow sphere aggregate, 5-10 parts hollow glass microsphere aggregate, 6-10 parts kyanite powder, 4-5 parts pyrophyllite, 5-8 parts silica fume, 20-30 parts high-alumina cement, 0.9-1.5 parts explosion-proof fiber, 0.001-0.002 parts cellulose ether, and 0.4-0.5 parts water-reducing agent. The lightweight self-flowing thermal insulation castable based on modified aggregates of this invention has a high self-flow value, good fluidity, and low bulk density, resulting in good thermal insulation performance.

Description

Technical Field

[0001] This invention belongs to the field of refractory ceramics technology, specifically relating to a lightweight self-flowing insulating castable based on modified aggregate and its preparation method. Background Technology

[0002] Lightweight insulating castable is a castable made primarily of lightweight aggregates such as expanded perlite, vermiculite, lightweight ceramsite, and alumina hollow spheres. It has low bulk density and low thermal conductivity and is mainly used for insulation layers in industrial kilns.

[0003] Conventional lightweight insulating castables use lightweight aggregates with high water absorption, resulting in extremely poor flowability during casting. This necessitates the use of vibrators for assisted casting, which easily leads to the lightweight aggregates floating, severe segregation, incomplete filling of the castable, tree cavities, and mold displacement. Therefore, a balance needs to be struck between the lightweight aggregate and casting performance. Summary of the Invention

[0004] The purpose of this invention is to provide a lightweight self-flowing thermal insulation castable based on modified aggregate, so as to solve the technical problem that lightweight aggregates tend to float during the casting of lightweight self-flowing thermal insulation castables in the prior art.

[0005] Another object of the present invention is to provide a method for preparing a lightweight self-flowing thermal insulation castable based on modified aggregate.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A lightweight self-flowing thermal insulation castable based on modified aggregate, comprising the following raw materials in parts by weight: The mixture contains 40-50 parts modified expanded perlite, 8-12 parts mullite hollow sphere aggregate, 5-10 parts hollow glass microsphere aggregate, 6-10 parts kyanite powder, 4-5 parts pyrophyllite, 5-8 parts silica powder, 20-30 parts high-alumina cement, 0.9-1.5 parts explosion-proof fiber, 0.001-0.002 parts cellulose ether, and 0.4-0.5 parts water-reducing agent.

[0007] Furthermore, the preparation method of the modified expanded perlite includes the following steps: mixing expanded perlite with polyethylene glycol and then drying it to obtain the product.

[0008] Furthermore, the amount of polyethylene glycol used is 6-8% of the mass of expanded perlite.

[0009] Furthermore, the preparation method of the mullite hollow sphere aggregate includes the following steps: S1: Disperse wood pulp cellulose in water to form a wood pulp cellulose suspension; S2: Add mullite hollow spheres to the wood pulp cellulose suspension and ultrasonically disperse for 10-30 minutes to obtain a composite suspension; S3: Add aluminum sol to the composite suspension, stir evenly, adjust the pH value to 6-8, gel, then dry and pulverize to obtain the final product.

[0010] Further, in step S1, the mass fraction of wood pulp cellulose in the wood pulp cellulose suspension is 10-20%; in step S2, the mass ratio of mullite hollow spheres to wood pulp cellulose suspension is 1:1.5-1:2; and in step S3, the mass ratio of the composite suspension to aluminum sol is 1:0.2-1:0.3.

[0011] Furthermore, the preparation method of the hollow glass microsphere aggregate includes the following steps: preparing a polyvinylpyrrolidone adhesive solution, mixing the hollow glass microspheres and the polyvinylpyrrolidone adhesive solution in a mixer, and then drying and pulverizing them after mixing.

[0012] Furthermore, the polyvinylpyrrolidone adhesive solution contains 10-12% polyvinylpyrrolidone by mass, and the mass ratio of hollow glass microspheres to the polyvinylpyrrolidone adhesive solution is 10:0.4-10:0.6.

[0013] Furthermore, the modified expanded perlite has a particle size of 8–1 mm, the mullite hollow sphere aggregate has a particle size of 5–1 mm, and the hollow glass microsphere aggregate has a particle size of 2–1 mm.

[0014] Furthermore, the kyanite powder is a powder that has passed through a 400-mesh sieve, and the pyrophyllite is a powder that has passed through a 200-mesh sieve.

[0015] The preparation method of lightweight self-flowing thermal insulation castable based on modified aggregate includes the following steps: mixing and stirring the modified expanded perlite, mullite hollow sphere aggregate, hollow glass microsphere aggregate, kyanite powder, pyrophyllite, silica powder, high alumina cement, explosion-proof fiber, cellulose ether, water-reducing agent and dispersant in the specified amounts until uniform, thus obtaining the final product.

[0016] The beneficial effects of this invention are: This invention relates to a lightweight self-flowing thermal insulation castable based on modified aggregates. The modified expanded perlite is modified with polyethylene glycol (PEG), which enhances its hydrophilicity during casting. Combined with a water-reducing agent, this prevents the expanded perlite from floating, ensuring uniform casting. At high temperatures, PEG decomposes, revealing a porous structure within the expanded perlite. Mullite hollow sphere aggregate is cast after being loaded with wood pulp cellulose. The hydrophilic nature of wood pulp cellulose allows for uniform dispersion of the mullite hollow spheres in the castable. Furthermore, at high temperatures, the wood pulp cellulose carbonizes, forming a porous structure, reducing bulk density, and improving thermal insulation performance. Hollow glass microsphere aggregate is modified with polyvinylpyrrolidone (PVP), enhancing its hydrophilicity. Combined with a water-reducing agent, this ensures uniform dispersion of the hollow glass microsphere aggregate, preventing floating. PVP decomposes at high temperatures, forming a porous structure within the hollow glass microspheres. The added water-reducing agent improves the flowability of the modified aggregate-based lightweight self-flowing thermal insulation castable, allowing for uniform casting without the need for vibration. Attached Figure Description

[0017] Figure 1 The results show the self-flow value of the lightweight self-flowing thermal insulation castables based on modified aggregates prepared in Examples 1-3 and Comparative Examples 1-4. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0019] Example 1 The lightweight self-flowing thermal insulation castable based on modified aggregate in this embodiment includes the following raw materials in parts by weight: The mixture consists of 45 kg of modified expanded perlite, 10 kg of mullite hollow sphere aggregate, 8 kg of hollow glass microsphere aggregate, 15 kg of kyanite powder, 5 kg of pyrophyllite, 6 kg of silica powder, 8 kg of high-alumina cement, 1.2 kg of explosion-proof fiber, 0.001 kg of cellulose ether, and 0.5 kg of water-reducing agent.

[0020] The preparation method of modified expanded perlite includes the following steps: pulverizing expanded perlite, mixing it with polyethylene glycol, ball milling for 120 minutes, and then drying and pulverizing to obtain the final product. The amount of polyethylene glycol used is 8% of the mass of the expanded perlite.

[0021] The preparation method of mullite hollow sphere aggregate includes the following steps: S1: Disperse wood pulp cellulose in water to form a wood pulp cellulose suspension; S2: Add mullite hollow spheres to the wood pulp cellulose suspension and ultrasonically disperse for 20 minutes to obtain a composite suspension; S3: Add aluminum sol to the composite suspension, stir evenly, adjust the pH to 7, gel, then dry and pulverize to obtain the final product. The mass fraction of wood pulp cellulose in the wood pulp cellulose suspension is 15%; the mass ratio of mullite hollow spheres to wood pulp cellulose suspension in step S2 is 1:1.5; the mass ratio of the composite suspension to aluminum sol in step S3 is 1:0.3.

[0022] The preparation method of hollow glass microsphere aggregate includes the following steps: preparing a polyvinylpyrrolidone (PVP) adhesive solution; mixing the hollow glass microspheres and the PPVP adhesive solution in a mixer; and then drying and pulverizing the mixture. The mass fraction of PPVP in the PPVP adhesive solution is 12%, and the mass ratio of hollow glass microspheres to the PPVP adhesive solution is 10:0.4.

[0023] The particle size of modified expanded perlite is 8-1 mm, the particle size of mullite hollow sphere aggregate is 5-1 mm, and the particle size of hollow glass microsphere aggregate is 2-1 mm.

[0024] The kyanite powder is a powder that has passed through a 400-mesh sieve, and the pyrophyllite is a powder that has passed through a 200-mesh sieve.

[0025] The preparation method of lightweight self-flowing thermal insulation castable based on modified aggregate includes the following steps: mixing and stirring the modified expanded perlite, mullite hollow sphere aggregate, hollow glass microsphere aggregate, kyanite powder, pyrophyllite, silica powder, high alumina cement, explosion-proof fiber, cellulose ether, water-reducing agent and dispersant in the specified amounts until uniform, thus obtaining the final product.

[0026] Example 2 The lightweight self-flowing thermal insulation castable based on modified aggregate in this embodiment includes the following raw materials in parts by weight: The mixture consists of 50 kg of modified expanded perlite, 8 kg of mullite hollow sphere aggregate, 10 kg of hollow glass microsphere aggregate, 18 kg of kyanite powder, 5 kg of pyrophyllite, 8 kg of silica powder, 10 kg of high-alumina cement, 1.5 kg of explosion-proof fiber, 0.002 kg of cellulose ether, and 0.4 kg of water-reducing agent.

[0027] The preparation method of modified expanded perlite includes the following steps: pulverizing expanded perlite, mixing it with polyethylene glycol, ball milling for 90 minutes, and then drying and pulverizing to obtain the final product. The amount of polyethylene glycol used is 6% of the mass of the expanded perlite.

[0028] The preparation method of mullite hollow sphere aggregate includes the following steps: S1: Disperse wood pulp cellulose in water to form a wood pulp cellulose suspension; S2: Add mullite hollow spheres to the wood pulp cellulose suspension and ultrasonically disperse for 10 min to obtain a composite suspension; S3: Add aluminum sol to the composite suspension, stir evenly, adjust the pH to 8, gel, then dry and pulverize to obtain the final product. The mass fraction of wood pulp cellulose in the wood pulp cellulose suspension is 10%; the mass ratio of mullite hollow spheres to wood pulp cellulose suspension in step S2 is 1:2; the mass ratio of the composite suspension to aluminum sol in step S3 is 1:0.3.

[0029] The preparation method of hollow glass microsphere aggregate includes the following steps: preparing a polyvinylpyrrolidone (PVP) adhesive solution; mixing the hollow glass microspheres and the PPVP adhesive solution in a mixer; drying and pulverizing after thorough mixing. The mass fraction of PPVP in the PPVP adhesive solution is 10%, and the mass ratio of hollow glass microspheres to the PPVP adhesive solution is 10:0.6.

[0030] The particle size of modified expanded perlite is 8-1 mm, the particle size of mullite hollow sphere aggregate is 5-1 mm, and the particle size of hollow glass microsphere aggregate is 2-1 mm.

[0031] The kyanite powder is a powder that has passed through a 400-mesh sieve, and the pyrophyllite is a powder that has passed through a 200-mesh sieve.

[0032] The preparation method of lightweight self-flowing thermal insulation castable based on modified aggregate includes the following steps: mixing and stirring the modified expanded perlite, mullite hollow sphere aggregate, hollow glass microsphere aggregate, kyanite powder, pyrophyllite, silica powder, high alumina cement, explosion-proof fiber, cellulose ether, water-reducing agent and dispersant in the specified amounts until uniform, thus obtaining the final product.

[0033] Example 3 The lightweight self-flowing thermal insulation castable based on modified aggregate in this embodiment includes the following raw materials in parts by weight: The mixture consists of 45 kg of modified expanded perlite, 12 kg of mullite hollow sphere aggregate, 8 kg of hollow glass microsphere aggregate, 12 kg of kyanite powder, 4 kg of pyrophyllite, 5 kg of silica powder, 5 kg of high-alumina cement, 0.9 kg of explosion-proof fiber, 0.002 kg of cellulose ether, and 0.5 kg of water-reducing agent.

[0034] The preparation method of modified expanded perlite includes the following steps: pulverizing expanded perlite, mixing it with polyethylene glycol, ball milling for 120 minutes, and then drying and pulverizing to obtain the final product. The amount of polyethylene glycol used is 6-8% of the mass of the expanded perlite.

[0035] The preparation method of mullite hollow sphere aggregate includes the following steps: S1: Disperse wood pulp cellulose in water to form a wood pulp cellulose suspension; S2: Add mullite hollow spheres to the wood pulp cellulose suspension and ultrasonically disperse for 30 minutes to obtain a composite suspension; S3: Add aluminum sol to the composite suspension, stir evenly, adjust the pH to 6, gel, then dry and pulverize to obtain the final product. The mass fraction of wood pulp cellulose in the wood pulp cellulose suspension is 20%; the mass ratio of mullite hollow spheres to wood pulp cellulose suspension in step S2 is 1:2; the mass ratio of the composite suspension to aluminum sol in step S3 is 1:0.2.

[0036] The preparation method of hollow glass microsphere aggregate includes the following steps: preparing a polyvinylpyrrolidone (PVP) adhesive solution; mixing the hollow glass microspheres and the PPVP adhesive solution in a mixer; drying and pulverizing after thorough mixing. The mass fraction of PPVP in the PPVP adhesive solution is 10%, and the mass ratio of hollow glass microspheres to the PPVP adhesive solution is 10:0.4.

[0037] The particle size of modified expanded perlite is 8-1 mm, the particle size of mullite hollow sphere aggregate is 5-1 mm, and the particle size of hollow glass microsphere aggregate is 2-1 mm.

[0038] The kyanite powder is a powder that has passed through a 400-mesh sieve, and the pyrophyllite is a powder that has passed through a 200-mesh sieve.

[0039] The preparation method of lightweight self-flowing thermal insulation castable based on modified aggregate includes the following steps: mixing and stirring the modified expanded perlite, mullite hollow sphere aggregate, hollow glass microsphere aggregate, kyanite powder, pyrophyllite, silica powder, high alumina cement, explosion-proof fiber, cellulose ether, water-reducing agent and dispersant in the specified amounts until uniform, thus obtaining the final product.

[0040] Example 4 The lightweight self-flowing thermal insulation castable based on modified aggregate in this embodiment includes the following raw materials in parts by weight: The mixture consists of 40 kg of modified expanded perlite, 12 kg of mullite hollow sphere aggregate, 5 kg of hollow glass microsphere aggregate, 15 kg of kyanite powder, 5 kg of pyrophyllite, 6 kg of silica powder, 8 kg of high-alumina cement, 1.2 kg of explosion-proof fiber, 0.001 kg of cellulose ether, and 0.4 kg of water-reducing agent.

[0041] The preparation method of modified expanded perlite includes the following steps: pulverizing expanded perlite, mixing it with polyethylene glycol, ball milling for 90-120 minutes, and then drying and pulverizing to obtain the final product. The amount of polyethylene glycol used is 6-8% of the mass of the expanded perlite.

[0042] The preparation method of mullite hollow sphere aggregate includes the following steps: S1: Disperse wood pulp cellulose in water to form a wood pulp cellulose suspension; S2: Add mullite hollow spheres to the wood pulp cellulose suspension and ultrasonically disperse for 10 min to obtain a composite suspension; S3: Add aluminum sol to the composite suspension, stir evenly, adjust the pH to 6, gel, then dry and pulverize to obtain the final product. The mass fraction of wood pulp cellulose in the wood pulp cellulose suspension is 20%; the mass ratio of mullite hollow spheres to wood pulp cellulose suspension in step S2 is 1:2; the mass ratio of the composite suspension to aluminum sol in step S3 is 1:0.2.

[0043] The preparation method of hollow glass microsphere aggregate includes the following steps: preparing a polyvinylpyrrolidone (PVP) adhesive solution; mixing the hollow glass microspheres and the PPVP adhesive solution in a mixer; and then drying and pulverizing the mixture. The mass fraction of PPVP in the PPVP adhesive solution is 12%, and the mass ratio of hollow glass microspheres to the PPVP adhesive solution is 10:0.4.

[0044] The particle size of modified expanded perlite is 8-1 mm, the particle size of mullite hollow sphere aggregate is 5-1 mm, and the particle size of hollow glass microsphere aggregate is 2-1 mm.

[0045] The kyanite powder is a powder that has passed through a 400-mesh sieve, and the pyrophyllite is a powder that has passed through a 200-mesh sieve.

[0046] The preparation method of lightweight self-flowing thermal insulation castable based on modified aggregate includes the following steps: mixing and stirring the modified expanded perlite, mullite hollow sphere aggregate, hollow glass microsphere aggregate, kyanite powder, pyrophyllite, silica powder, high alumina cement, explosion-proof fiber, cellulose ether, water-reducing agent and dispersant in the specified amounts until uniform, thus obtaining the final product.

[0047] Example 5 The lightweight self-flowing thermal insulation castable based on modified aggregate in this embodiment includes the following raw materials in parts by weight: The mixture consists of 45 kg of modified expanded perlite, 8 kg of mullite hollow sphere aggregate, 8 kg of hollow glass microsphere aggregate, 12 kg of kyanite powder, 4 kg of pyrophyllite, 5 kg of silica powder, 10 kg of high-alumina cement, 0.9 kg of explosion-proof fiber, 0.001 kg of cellulose ether, and 0.5 kg of water-reducing agent.

[0048] The preparation method of modified expanded perlite includes the following steps: pulverizing expanded perlite, mixing it with polyethylene glycol, ball milling for 90-120 minutes, and then drying and pulverizing to obtain the final product. The amount of polyethylene glycol used is 6-8% of the mass of the expanded perlite.

[0049] The preparation method of mullite hollow sphere aggregate includes the following steps: S1: Disperse wood pulp cellulose in water to form a wood pulp cellulose suspension; S2: Add mullite hollow spheres to the wood pulp cellulose suspension and ultrasonically disperse for 30 minutes to obtain a composite suspension; S3: Add aluminum sol to the composite suspension, stir evenly, adjust the pH to 8, gel, then dry and pulverize to obtain the final product. The mass fraction of wood pulp cellulose in the wood pulp cellulose suspension is 10%; the mass ratio of mullite hollow spheres to wood pulp cellulose suspension in step S2 is 1:1.5; the mass ratio of the composite suspension to aluminum sol in step S3 is 1:0.3.

[0050] The preparation method of hollow glass microsphere aggregate includes the following steps: preparing a polyvinylpyrrolidone (PVP) adhesive solution; mixing the hollow glass microspheres and the PPVP adhesive solution in a mixer; and then drying and pulverizing the mixture. The mass fraction of PPVP in the PPVP adhesive solution is 12%, and the mass ratio of hollow glass microspheres to the PPVP adhesive solution is 10:0.6.

[0051] The particle size of modified expanded perlite is 8-1 mm, the particle size of mullite hollow sphere aggregate is 5-1 mm, and the particle size of hollow glass microsphere aggregate is 2-1 mm.

[0052] The kyanite powder is a powder that has passed through a 400-mesh sieve, and the pyrophyllite is a powder that has passed through a 200-mesh sieve.

[0053] The preparation method of lightweight self-flowing thermal insulation castable based on modified aggregate includes the following steps: mixing and stirring the modified expanded perlite, mullite hollow sphere aggregate, hollow glass microsphere aggregate, kyanite powder, pyrophyllite, silica powder, high alumina cement, explosion-proof fiber, cellulose ether, water-reducing agent and dispersant in the specified amounts until uniform, thus obtaining the final product.

[0054] Comparative Example 1 The lightweight self-flowing thermal insulation castable based on modified aggregate in this comparative example is roughly the same as that in Example 1, except that the expanded perlite is not modified with polyethylene glycol.

[0055] Comparative Example 2 The lightweight self-flowing thermal insulation castable based on modified aggregate in this comparative example is roughly the same as that in Example 1, except that the mullite hollow spheres are not loaded with wood pulp cellulose.

[0056] Comparative Example 3 The lightweight self-flowing thermal insulation castable based on modified aggregate in this comparative example is roughly the same as that in Example 1, except that the hollow glass microspheres are not modified with polyvinylpyrrolidone.

[0057] Comparative Example 4 The lightweight self-flowing thermal insulation castable based on modified aggregate in this comparative example has the same general scheme as that in Example 1, except that no water-reducing agent is added.

[0058] Test case The lightweight self-flowing thermal insulation castables based on modified aggregates prepared in Examples 1-3 and Comparative Examples 1-4 were respectively mixed with 15-25% water by weight of the castables, cast into molds, dried at 110°C for 24 hours, and kept at 1000°C for 3 hours. The following tests were conducted, and the test results are shown in Table 1.

[0059] Bulk density: Refer to GB / T4513.6-2017 Unshaped refractories Part 6: Determination of physical properties to test the bulk density; Flexural strength: The flexural strength was tested according to the method in GB / T 3001-2017 "Test Method for Flexural Strength of Refractory Materials at Room Temperature"; Compressive strength: The compressive strength was tested in accordance with the method of GB / T 5072-2023 "Test Method for Compressive Strength of Refractory Materials at Room Temperature".

[0060] Thermal conductivity: The thermal conductivity was tested in accordance with the method specified in GB / T5990-2021 "Test Method for Thermal Conductivity of Refractory Materials".

[0061] Table 1 Performance test results.

[0062]

[0063] From Table 1 and Figure 1 It can be seen that the lightweight self-flowing thermal insulation castables based on modified aggregates in Examples 1-3 of the present invention have high self-flow values, which can meet the casting requirements. Furthermore, the lightweight self-flowing thermal insulation castables based on modified aggregates in Examples 1-3 of the present invention have low bulk density and good thermal insulation performance.

[0064] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the content of the present invention's specification shall also be included within the scope of protection of the present invention.

Claims

1. A lightweight self-flowing thermal insulation castable based on modified aggregate, characterized in that, The raw materials include the following parts by weight: The mixture contains 40-50 parts modified expanded perlite, 8-12 parts mullite hollow sphere aggregate, 5-10 parts hollow glass microsphere aggregate, 6-10 parts kyanite powder, 4-5 parts pyrophyllite, 5-8 parts silica powder, 20-30 parts high-alumina cement, 0.9-1.5 parts explosion-proof fiber, 0.001-0.002 parts cellulose ether, and 0.4-0.5 parts water-reducing agent.

2. The lightweight self-flowing thermal insulation castable based on modified aggregate according to claim 1, characterized in that, The preparation method of the modified expanded perlite includes the following steps: mixing expanded perlite with polyethylene glycol and then drying it to obtain the product.

3. The lightweight self-flowing thermal insulation castable based on modified aggregate according to claim 2, characterized in that, The amount of polyethylene glycol used is 6 to 8% of the mass of expanded perlite.

4. The lightweight self-flowing thermal insulation castable based on modified aggregate according to claim 1, characterized in that, The preparation method of the mullite hollow sphere aggregate includes the following steps: S1: Disperse wood pulp cellulose in water to form a wood pulp cellulose suspension; S2: Add mullite hollow spheres to the wood pulp cellulose suspension and ultrasonically disperse for 10-30 minutes to obtain a composite suspension; S3: Add aluminum sol to the composite suspension, stir evenly, adjust the pH value to 6-8, gel, then dry and pulverize to obtain the final product.

5. The lightweight self-flowing thermal insulation castable based on modified aggregate according to claim 4, characterized in that, In step S1, the mass fraction of wood pulp cellulose in the wood pulp cellulose suspension is 10-20%; in step S2, the mass ratio of mullite hollow spheres to wood pulp cellulose suspension is 1:1.5-1:2; in step S3, the mass ratio of the composite suspension to aluminum sol is 1:0.2-1:0.

3.

6. The lightweight self-flowing thermal insulation castable based on modified aggregate according to claim 1, characterized in that, The preparation method of the hollow glass microsphere aggregate includes the following steps: preparing a polyvinylpyrrolidone adhesive solution, mixing the hollow glass microspheres and the polyvinylpyrrolidone adhesive solution in a mixer, and then drying and pulverizing them after mixing.

7. The lightweight self-flowing thermal insulation castable based on modified aggregate according to claim 6, characterized in that, The polyvinylpyrrolidone adhesive solution contains 10-12% polyvinylpyrrolidone by mass, and the mass ratio of hollow glass microspheres to the polyvinylpyrrolidone adhesive solution is 10:0.4-10:0.

6.

8. The lightweight self-flowing thermal insulation castable based on modified aggregate according to claim 1, characterized in that, The modified expanded perlite has a particle size of 8–1 mm, the mullite hollow sphere aggregate has a particle size of 5–1 mm, and the hollow glass microsphere aggregate has a particle size of 2–1 mm.

9. The lightweight self-flowing thermal insulation castable based on modified aggregate according to claim 1, characterized in that, The kyanite powder is a powder that has passed through a 400-mesh sieve, and the pyrophyllite powder is a powder that has passed through a 200-mesh sieve.

10. The method for preparing lightweight self-flowing thermal insulation castable based on modified aggregate as described in claim 1, characterized in that, The process includes the following steps: mixing and stirring the modified expanded perlite, mullite hollow sphere aggregate, hollow glass microsphere aggregate, kyanite powder, pyrophyllite, silica powder, high alumina cement, explosion-proof fiber, cellulose ether, water-reducing agent and dispersant in the specified amounts until homogeneous.

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