A high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material and its preparation method

Abstract

This invention discloses a high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material and its preparation method, comprising dry material, wet material, and foaming agent. The dry material, by weight, consists of the following components: 50-70 parts of solid waste-based sulfur-aluminum-iron cementitious material, 5-20 parts of slag powder, 5-15 parts of steel slag powder, 0.2-0.8 parts of calcium carbide slag, 0.3-1 parts of calcium stearate, and 0.01-0.05 parts of cellulose ether. The wet material consists of the following components: 20-30 parts of undisturbed desulfurized gypsum, 2-5 parts of undisturbed red mud, 0.1-0.5 parts of polycarboxylate superplasticizer, 0.05-0.3 parts of composite retarder, 0.01-0.5 parts of chopped fibers, 0.5-2 parts of polymer emulsion, and a water-cement ratio of 0.3-0.4. The foaming agent is hydrogen peroxide, added at 1-3% of the total mass of the thermal insulation material. The raw material section is divided into two components: dry and wet. The synergistic hydration and microstructure filling effect of solid waste-based sulfur-aluminum-iron cementitious materials with slag powder, steel slag powder, desulfurized gypsum, etc., significantly improves the basic mechanical properties and other parameters of lightweight insulation materials. In addition, the coupled pressure-slip foaming process has a positive effect on improving the performance and strengthening the cell structure of lightweight insulation materials.

Description

Technical Field

[0001] This invention belongs to the field of solid waste resource utilization technology, specifically relating to a high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material and its preparation method. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] Carbon emissions during the building operation phase account for 21.7% of the nation's total carbon emissions, and thermal insulation is key to reducing building envelope energy consumption and carbon emissions. Therefore, it is necessary to develop high-performance, low-energy-consumption lightweight insulation materials for prefabricated buildings.

[0004] Currently, lightweight thermal insulation materials are generally based on autoclaved aerated concrete (AAC) panels / blocks. To ensure product performance, their preparation process typically requires curing in an autoclave at 180-200℃ and 1.1-2 MPa saturated steam pressure for 8-24 hours. This curing process involves high energy consumption and CO2 emissions, accounting for approximately 20% of the overall environmental impact. Furthermore, its raw materials usually require cement, lime, and silica sand.

[0005] The cement and lime industries account for approximately 8% and 1% of global anthropogenic CO2 emissions, respectively. Overexploitation of sand and gravel severely threatens the stability of river channels and ecosystems. This not only limits the low-carbon, sustainable development of lightweight insulation materials for prefabricated buildings but also contributes to environmental degradation.

[0006] Furthermore, although autoclaved aerated concrete (AAC) possesses excellent strength, its pore structure is predominantly interconnected, resulting in poor pore quality and consequently high water absorption and poor thermal insulation. Non-autoclaved aerated concrete (NAC) cannot achieve the strength requirements of AAC, and its pore structure is difficult to control homogeneously. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material and its preparation method.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0009] In a first aspect, the present invention provides a high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material, comprising dry material, wet material and foaming agent, wherein, by weight, the dry material is composed of the following components: 50-70 parts of solid waste-based sulfur-aluminum-iron cementitious material, 5-20 parts of slag powder, 5-15 parts of steel slag powder, 0.2-0.8 parts of calcium carbide slag, 0.3-1 parts of calcium stearate, and 0.01-0.05 parts of cellulose ether;

[0010] The wet material consists of the following components: 20-30 parts of raw by-product gypsum, 2-5 parts of raw red mud, 0.1-0.5 parts of polycarboxylate superplasticizer, 0.05-0.3 parts of composite retarder, 0.01-0.5 parts of chopped fiber, 0.5-2 parts of polymer emulsion, and a water-cement ratio of 0.3-0.4.

[0011] The foaming agent is hydrogen peroxide, and its addition amount is 1-3% of the total mass of the insulation material.

[0012] Raw by-product gypsum refers to desulfurized gypsum, phosphogypsum, fluorogypsum, etc., in their original state with high water content, without undergoing pretreatment such as drying;

[0013] Raw red mud refers to red mud with high water content in its original state, without undergoing pretreatment such as drying.

[0014] The functions of each component are as follows:

[0015] Solid waste-based sulfur-aluminum-iron cementitious materials: are the main source of strength for lightweight thermal insulation materials. They play a cementing role and have the characteristics of early strength, high strength and fast hardening. They give full play to their early strength advantage, thus eliminating the need for autoclaving.

[0016] Slag powder: The silicon and aluminum ions it dissolves can promote the formation of C(A)-SH, and improve and enhance the later strength and stability of solid waste-based sulfur-aluminum-iron cementitious materials;

[0017] Steel slag powder: Similar to slag powder, it has certain hydration activity; in addition, the calcium oxide it contains can increase the liquid phase alkalinity of the composite cementitious system, thereby further promoting the hydration process and strength gain; on the other hand, the high iron content can replace traditional MnO2 and play a catalytic role in the decomposition of hydrogen peroxide (rapid decomposition of hydrogen peroxide is necessary for foaming, but rapid decomposition of hydrogen peroxide requires a catalyst, 40-55℃ or pH value of 12-13, but the temperature of the mixing system of this invention is the ambient temperature, generally below 30℃, and the pH value of the mixing system is 10-11.5, so under normal conditions, hydrogen peroxide cannot decompose rapidly, and therefore cannot play a rapid foaming role), thereby improving foaming efficiency. This catalytic effect is the first time proposed by the inventor and has not been reported before.

[0018] Calcium carbide slag: Its main component is calcium hydroxide. It promotes the hydration process by increasing the alkalinity of the liquid phase, and at the same time affects the rheological and coagulation characteristics of the slurry, thereby improving the pore distribution of the foam material.

[0019] Calcium stearate: As a foam stabilizer, it is used to stabilize foam structure and adjust pore size;

[0020] Cellulose ethers: improve the stability of foam slurries by increasing slurry consistency;

[0021] Original by-product gypsum: Its main component is calcium sulfate dihydrate, which provides a sufficient source of calcium sulfate for the hydration of solid waste-based sulfur-aluminum-iron cementitious materials and slag powder, accelerates the hydration process, and participates in the hydration reaction.

[0022] Unprocessed red mud: On the one hand, its particles are small and fluffy, which can give full play to its microstructure filling effect; on the other hand, its high iron content can replace traditional MnO2 and play a role in catalyzing the decomposition of hydrogen peroxide. This catalytic effect was first proposed by the inventor and has not been reported.

[0023] Polycarboxylate superplasticizer: regulates the rheological properties of composite cementitious systems and enhances the fluidity of slurry;

[0024] Composite retarder: Adjusts the setting time of composite gelling paste so that the setting time of foam paste matches the foaming and expansion process;

[0025] Short-cut fibers: toughening and modifying effect, while also helping to promote foam stability;

[0026] Polymer emulsions: On the one hand, their film-forming properties can enhance the thickness and adhesion of cell walls; on the other hand, they can reduce the resistance to foam formation and stabilize the cell structure by lowering the surface tension of the slurry.

[0027] In some embodiments, the fineness of solid waste-based sulfur-aluminum-iron cementitious materials, slag powder, steel slag powder, and carbide slag is sieved through a 200-mesh sieve.

[0028] In some embodiments, the composite retarder includes tartaric acid retarder and boric acid retarder, wherein the mass ratio of tartaric acid retarder to boric acid retarder is 1-3:1.

[0029] In some embodiments, the polymer emulsion is a VAE emulsion, a silicone-acrylic emulsion, or a styrene-acrylic emulsion.

[0030] In some embodiments, the length of the chopped fibers is 6-12 mm.

[0031] In some embodiments, the foaming agent is hydrogen peroxide with a mass fraction of 30%.

[0032] Secondly, the present invention provides a method for preparing the high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material, comprising the following steps:

[0033] Solid waste-based sulfur-aluminum-iron cementitious materials, slag powder, steel slag powder and carbide slag are mixed in proportion and then ground until the residue on a 200-mesh square hole sieve is less than 10%, thus obtaining mixed powder.

[0034] After adding calcium stearate and cellulose ether to the mixed powder, mix well to obtain dry material;

[0035] The raw desulfurized gypsum, red mud, polycarboxylate superplasticizer, composite retarder, short-cut fiber, polymer emulsion and water are mixed in proportion to obtain a wet material;

[0036] The dry and wet materials are mixed to form a mixed slurry;

[0037] Stir the mixed slurry, add hydrogen peroxide during the stirring process, and then stir rapidly for 20-40 seconds to obtain foam slurry;

[0038] The obtained foam slurry is subjected to variable pressure foaming, molding and set time, and finally cured to obtain a high-performance, low-energy solid waste-based lightweight thermal insulation material.

[0039] In some embodiments, after mixing the dry and wet materials, the mixture is first slowly stirred for 20-40 seconds, and then quickly stirred for 2-5 minutes to form a mixed slurry.

[0040] Preferably, the stirring rate of the slow stirring is 100-160 r / min; the stirring rate of the fast stirring is 250-300 r / min.

[0041] In some embodiments, the variable pressure foaming and molding are performed in a variable pressure foaming mold box.

[0042] Preferably, the movable pressure plate of the variable pressure foaming mold box is connected to the top of the variable pressure foaming mold box via a spring assembly. Variable pressure foaming can significantly suppress mold collapse, optimize the pore structure, and greatly shorten the curing and demolding time of the foam.

[0043] More preferably, during the pressure variation foaming process, the pressure range of the movable pressure plate on the foaming system is 5-20N, corresponding to a 100×100mm... 2 The area under pressure.

[0044] Preferably, the time for pressure foaming and molding is 4-6 hours.

[0045] The beneficial effects achieved by one or more embodiments of the present invention described above are as follows:

[0046] Compared with existing technologies, the lightweight thermal insulation material prepared by this invention eliminates the need for high-temperature, high-pressure, and steam curing in an autoclave, making the preparation process simpler, safer, and significantly reducing equipment investment.

[0047] In terms of raw material selection, all materials are derived from bulk industrial solid waste. Solid wastes such as carbide slag and red mud are used as functional regulators. The addition of organic components such as calcium stearate and polymer emulsions strengthens the pore structure, establishing coupling and bridging effects between organic components and inorganic hydration products, ultimately forming a stable embedded pore wall structure. Leveraging the early strength, rapid hardening, and high strength characteristics of solid waste-based sulfur-aluminum-iron cementitious materials, the addition of slag powder, steel slag powder, and by-product gypsum further enhances the synergistic hydration effect and microstructure filling effect of the cementitious materials, significantly improving the basic mechanical properties and other parameters of the lightweight thermal insulation material.

[0048] During the mixing process of raw materials, a combination of dry and wet components was chosen. The process is naturally suitable for the direct use of high-moisture solid waste, eliminating the need for pretreatment processes such as drying of high-moisture solid waste, and further reducing the cost and energy consumption of the raw material stage.

[0049] Furthermore, a pressure-variable foaming method was introduced, achieving dynamic equilibrium of foam stress through pressure changes. This strengthens the cell structure, expands the range of stable foaming requirements for the slurry to a certain extent, reduces the amount of admixtures, further lowers raw material costs and potential energy consumption, and ensures sufficient hydration of the cementitious system. Most importantly, in terms of product performance, the specific compressive strength, thermal conductivity, and water absorption of the solid waste-based lightweight insulation material completely exceed the performance indicators of autoclaved aerated concrete. Ultimately, a high-performance, low-energy-consumption solid waste-based lightweight insulation material for prefabricated buildings was prepared. This not only improves the energy efficiency and living comfort of buildings but also promotes the green transformation of building materials, having a positive impact on achieving sustainable development in the construction industry. Attached Figure Description

[0050] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0051] Figure 1 This is a process flow diagram of an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram of the structure of the variable pressure foaming device according to an embodiment of the present invention;

[0053] Figure 3 This is an enlarged view of the lightweight thermal insulation material of this invention. Detailed Implementation

[0054] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0055] The present invention will be further described below with reference to the embodiments.

[0056] Example 1

[0057] This invention provides a high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material. The raw materials of this lightweight thermal insulation material consist of two parts: dry materials and wet materials. In general, it uses solid waste-based sulfur-aluminum-iron cementitious materials, slag powder, steel slag powder, and undisturbed desulfurized gypsum as the main cementitious materials, carbide slag and red mud as solid waste-based functional regulators, calcium stearate and cellulose ether as foam stabilizers, polymer emulsion as cell reinforcement agents, chopped fibers as toughening materials, polycarboxylate superplasticizer and composite retarder as rheology modifiers, and 30% hydrogen peroxide as a foaming agent. The water used meets the requirements for concrete mixing water.

[0058] The preparation method of this high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material includes the following steps:

[0059] (1) Take 55 parts of solid waste-based sulfur-aluminum-iron cementitious material, add 15 parts of slag powder, 5 parts of steel slag powder, and 0.4 parts of carbide slag, and grind and premix them. The fineness requirement is to meet the requirements of 200 mesh square hole sieve, with a sieve residue of less than 10%.

[0060] (2) Add 0.5 parts of calcium stearate and 0.02 parts of cellulose ether to the mixture in step (1) and dry mix for 1 minute to obtain the dry material component for later use.

[0061] (3) Take 25 parts of undisturbed desulfurized gypsum, 2 parts of undisturbed red mud, 0.2 parts of polycarboxylate superplasticizer, 0.2 parts of composite retarder (the mass ratio of tartaric acid and boric acid is 1:1), 0.2 parts of short chopped fiber, 1 part of VAE emulsion, and 30 parts of water. Mix them wet for 1 minute to make wet material components for later use.

[0062] (4) Take the dry material component from step (2) and mix it with the wet material component from step (3). Stir slowly for 30 seconds, then stir quickly for 3 minutes to make a mixed slurry.

[0063] (5) During the slow stirring of the slurry in step (4), add 1.5 parts of hydrogen peroxide with a mass fraction of 30%, and then stir quickly for 20 seconds;

[0064] (6) Pour the foam slurry mixed in step (5) into a specially made variable pressure foaming mold box. That is, on the basis of the mold box, a "piston-type cover plate" with springs that can extend and retract up and down is added. When the foam slurry expands freely to a certain position, it will contact the cover plate and thus be subjected to downward variable pressure. Finally, the lightweight insulation material is demolded 5 hours after molding. After that, it can be properly cured in a standard curing room to obtain high-performance, low-energy solid waste-based lightweight insulation material.

[0065] Example 2

[0066] This invention provides a high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material. The raw materials of this lightweight thermal insulation material consist of two parts: dry materials and wet materials. In general, it uses solid waste-based sulfur-aluminum-iron cementitious materials, slag powder, steel slag powder, and undisturbed desulfurized gypsum as the main cementitious materials, carbide slag and red mud as solid waste-based functional regulators, calcium stearate and cellulose ether as foam stabilizers, polymer emulsion as cell reinforcement agents, chopped fibers as toughening materials, polycarboxylate superplasticizer and composite retarder as rheology modifiers, and 30% hydrogen peroxide as a foaming agent. The water used meets the requirements for concrete mixing water.

[0067] This invention proposes a high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material and its preparation method, comprising the following steps:

[0068] (1) Take 60 parts of solid waste-based sulfur-aluminum-iron cementitious material, add 5 parts of slag powder, 5 parts of steel slag powder, and 0.6 parts of carbide slag, and grind and premix them. The fineness requirement is that the residue on a 200-mesh square hole sieve is less than 10%.

[0069] (2) Add 0.8 parts of calcium stearate and 0.03 parts of cellulose ether to the mixture in step (1) and dry mix and stir to make dry material components for later use;

[0070] (3) Take 30 parts of undisturbed desulfurized gypsum, 3 parts of red mud, 0.3 parts of polycarboxylate superplasticizer, 0.3 parts of composite retarder (the mass ratio of tartaric acid and boric acid is 1:1), 0.4 parts of short fiber, 2 parts of silicone acrylic emulsion, and 40 parts of water, mix them wet and stir them as wet material components for later use.

[0071] (4) Take the dry material component from step (2) and mix it with the wet material component from step (3). Stir slowly for 30 seconds, then stir quickly for 3 minutes to make a mixed slurry.

[0072] (5) During the slow stirring of the slurry in step (4), add 2 parts of hydrogen peroxide with a mass fraction of 30%, and then stir quickly for 30 seconds;

[0073] (6) Pour the foam slurry mixed in step (5) into a specially made variable pressure foaming mold box. That is, on the basis of the mold box, a "piston-type cover plate" with springs that can extend and retract up and down is added. When the foam slurry expands freely to a certain position, it will contact the cover plate and thus be subjected to downward variable pressure. Finally, the lightweight insulation material is demolded 6 hours after molding. After that, it can be properly cured in a standard curing room to obtain a high-performance, low-energy solid waste-based lightweight insulation material.

[0074] Example 3

[0075] This invention provides a high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material. The raw materials of this lightweight thermal insulation material consist of two parts: dry materials and wet materials. In general, it uses solid waste-based sulfur-aluminum-iron cementitious materials, slag powder, steel slag powder, and undisturbed desulfurized gypsum as the main cementitious materials, carbide slag and red mud as solid waste-based functional regulators, calcium stearate and cellulose ether as foam stabilizers, polymer emulsion as cell reinforcement agents, chopped fibers as toughening materials, polycarboxylate superplasticizer and composite retarder as rheology modifiers, and 30% hydrogen peroxide as a foaming agent. The water used meets the requirements for concrete mixing water.

[0076] A high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material and its preparation method, comprising the following steps:

[0077] (1) Take 70 parts of solid waste-based sulfur-aluminum-iron cementitious material, add 5 parts of slag powder, 5 parts of steel slag powder, and 0.2 parts of carbide slag, and grind and premix them. The fineness requirement is that the residue on a 200-mesh square hole sieve is less than 10%.

[0078] (2) Add 0.3 parts of calcium stearate and 0.01 parts of cellulose ether to the mixture in step (1) and dry mix and stir to make it into a dry material component for later use.

[0079] (3) Take 20 parts of undisturbed desulfurized gypsum, 5 parts of red mud, 0.4 parts of polycarboxylate superplasticizer, 0.1 parts of composite retarder (the mass ratio of tartaric acid and boric acid is 1:1), 0.1 parts of chopped fiber, 0.5 parts of styrene-acrylic emulsion, and 35 parts of water, mix them by wet method, and use them as wet material components for later use.

[0080] (4) Take the dry material component from step (2) and mix it with the wet material component from step (3). Stir slowly for 30 seconds, then stir quickly for 3 minutes to make a mixed slurry.

[0081] (5) During the slow stirring of the slurry in step (4), add 1.2 parts of hydrogen peroxide with a mass fraction of 30%, and then stir rapidly for 40 seconds;

[0082] (6) Pour the foam slurry mixed in step (5) into a specially made variable pressure foaming mold box. That is, on the basis of the mold box, a "piston-type cover plate" with springs that can extend and retract up and down is added. When the foam slurry expands freely to a certain position, it will contact the cover plate and thus be subjected to downward variable pressure. Finally, the lightweight insulation material is demolded 4 hours after molding. After that, it can be properly cured in a standard curing room to obtain high-performance, low-energy solid waste-based lightweight insulation material.

[0083] Comparative Example 1

[0084] The difference from Example 1 is that the slag powder is omitted, but everything else is the same as in Example 1.

[0085] Comparative Example 2

[0086] The difference from Example 1 is that the steel slag powder is omitted, while the rest is the same as Example 1.

[0087] Comparative Example 3

[0088] The difference from Example 1 is that the carbide slag is omitted, and everything else is the same as Example 1.

[0089] Comparative Example 4

[0090] The difference from Example 1 is that calcium stearate is omitted, otherwise it is the same as Example 1.

[0091] Comparative Example 5

[0092] The difference from Example 1 is that the cellulose ether is omitted; otherwise, it is the same as Example 1.

[0093] Comparative Example 6

[0094] The difference from Example 1 is that the polymer emulsion is omitted, otherwise it is the same as Example 1.

[0095] Comparative Example 7

[0096] The difference from Example 1 is that constant pressure foaming and molding are used, while the rest is the same as Example 1.

[0097] Table 1. Performance of the solid waste-based lightweight thermal insulation materials prepared in Examples 1-3

[0098]

[0099]

[0100] In Table 1, the density of the product varies due to the different amounts of foaming agent added in different embodiments, thus corresponding to different index requirements in the standard.

[0101] Table 2 shows the performance of the solid waste-based lightweight thermal insulation materials prepared in Comparative Examples 1-7.

[0102]

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material, characterized in that: It includes dry materials, wet materials and foaming agents. The dry materials, by weight, consist of the following components: 50-70 parts of solid waste-based sulfur-aluminum-iron cementitious material, 5-20 parts of slag powder, 5-15 parts of steel slag powder, 0.2-0.8 parts of calcium carbide slag, 0.3-1 parts of calcium stearate, and 0.01-0.05 parts of cellulose ether. The wet material consists of the following components: 20-30 parts of undisturbed desulfurized gypsum, 2-5 parts of undisturbed red mud, 0.1-0.5 parts of polycarboxylate superplasticizer, 0.1-0.3 parts of composite retarder, 0.1-0.4 parts of chopped fiber, 0.5-2 parts of polymer emulsion, and a water-cement ratio of 0.3-0.

4. The foaming agent is hydrogen peroxide, and its addition amount is 1-3% of the total mass of the insulation material.

2. The high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 1, characterized in that: Solid waste-based sulfur-aluminum-iron cementitious materials, slag powder, steel slag powder, and carbide slag have a fineness of passing through a 200-mesh sieve.

3. The high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 1, characterized in that: The composite retarder includes tartaric acid retarder and boric acid retarder, with a mass ratio of tartaric acid retarder to boric acid retarder of 1-3:

1.

4. The high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 1, characterized in that: The polymer emulsion is a VAE emulsion, a silicone-acrylic emulsion, or a styrene-acrylic emulsion.

5. The high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 1, characterized in that: The chopped fibers are 6-12 mm long.

6. The high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 1, characterized in that: The foaming agent is hydrogen peroxide with a mass fraction of 25-30%.

7. The preparation method of the high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to any one of claims 1-6, characterized in that: Includes the following steps: Solid waste-based sulfur-aluminum-iron cementitious materials, slag powder, steel slag powder and carbide slag are mixed in proportion and then ground until the residue on a 200-mesh square hole sieve is less than 10%, thus obtaining mixed powder. After adding calcium stearate and cellulose ether to the mixed powder, mix well to obtain dry material; The raw desulfurized gypsum, red mud, polycarboxylate superplasticizer, composite retarder, short-cut fiber, polymer emulsion and water are mixed in proportion to obtain a wet material; The dry and wet materials are mixed to form a mixed slurry; Stir the mixed slurry, add hydrogen peroxide during the stirring process, and then stir rapidly for 20-40 seconds to obtain foam slurry; The obtained foam slurry is subjected to variable pressure foaming, molding and set time, and finally cured to obtain a high-performance, low-energy solid waste-based lightweight thermal insulation material.

8. The method for preparing high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 7, characterized in that: After mixing the dry and wet materials, stir slowly for 20-40 seconds, then stir quickly for 2-5 minutes to make a mixed slurry.

9. The method for preparing high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 8, characterized in that: The stirring rate of the slow stirring is 100-160 r / min; the stirring rate of the fast stirring is 250-300 r / min.

10. The method for preparing high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 7, characterized in that: The variable pressure foaming and molding are carried out in a variable pressure foaming mold box.

11. The method for preparing high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 7, characterized in that: The movable pressure plate of the variable pressure foaming mold box is connected to the top of the variable pressure foaming mold box via a spring assembly.

12. The method for preparing high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 11, characterized in that: During the pressure variation foaming process, the movable pressure plate exerts a pressure range of 5-20 N on the foaming system, corresponding to a 100×100mm diameter. 2 The area under pressure.

13. The method for preparing high-performance, low-energy-consumption solid waste-based lightweight thermal insulation material according to claim 11, characterized in that: The time for pressure foaming and molding is 4-6 hours.

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