A method for preparing and utilizing a phosphogypsum slag-based aerogel thermal insulation material

Abstract

The application discloses a kind of based on phosphogypsum slag solid waste aerogel heat insulation material preparation and resource utilization method, it is related to the technical field of aerogel heat insulation material.A kind of based on phosphogypsum slag solid waste aerogel heat insulation material, it includes the following mass parts of raw materials: phosphogypsum slag pretreatment powder 100 parts, silicon source 50-150 parts, stabilizer 0.5-5 parts, surfactant 0.1-5 parts, solvent 1000-2000 parts.By converting industrial solid waste phosphogypsum slag into core raw material, significantly reduce its pollution, realize solid waste resource utilization.Compared with traditional aerogel relies on high-purity silicon source, the present application replaces part of silicon source with phosphogypsum slag, reduces the dependence on primary mineral resources, promotes the low-carbon cycle of industrial solid waste in the field of building materials.The present application is based on solid waste resource utilization, forms triple breakthrough in environmental protection, economy and performance, realizes "waste control waste" at the same time, promotes the large-scale application of high-performance thermal insulation materials.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of aerogel thermal insulation materials, and particularly relates to an aerogel thermal insulation material preparation and resource utilization method based on phosphogypsum slag solid waste. BACKGROUND

[0002] In the fields of industrial production and construction, thermal insulation materials are widely used, and their performance directly affects energy utilization efficiency and cost. Traditional thermal insulation materials such as rock wool and glass wool have defects such as high thermal conductivity, poor thermal insulation effect, easy moisture absorption and powderization, and short thermal insulation life, and have been difficult to meet the increasingly strict energy saving and environmental protection standards.

[0003] Phosphogypsum is a major by-product of the phosphorus chemical industry, and its annual output is huge. Its large-scale storage not only occupies land, but also causes serious pollution to the surrounding soil, water and air due to the presence of harmful impurities such as un-washed phosphoric acid and fluoride, becoming a major problem for the sustainable development of the industry. Although there are currently various ways to utilize phosphogypsum resources, such as producing sulfuric acid, cement retarder and soil conditioner, the overall utilization rate is still low, and a large amount of phosphogypsum still cannot be properly disposed of.

[0004] Aerogels have extremely low thermal conductivity and excellent thermal insulation performance due to their unique nano-porous structure, and are known as "super thermal insulation materials", and have great application potential in the field of thermal insulation. However, the production cost of traditional aerogels is high, mainly due to the high price of raw materials, complex production process and high energy consumption, which seriously limits its large-scale commercial application. If aerogel thermal insulation materials can be prepared from phosphogypsum slag, it will open up a new way for the resource utilization of phosphogypsum, significantly reduce the production cost of aerogels, have environmental and economic benefits, promote the efficient recycling of industrial solid waste in the building materials field, help building energy saving and green and sustainable development, and have far-reaching significance for related industries. SUMMARY

[0005] The application aims to provide an aerogel thermal insulation material based on phosphogypsum slag solid waste to realize resource utilization of industrial solid waste, improve thermal insulation effect, reduce production cost and promote environmental protection and energy saving development.

[0006] To achieve the above purpose, the technical scheme adopted by the application is as follows: an aerogel thermal insulation material based on phosphogypsum slag solid waste, comprising the following raw materials by mass: 100 parts of phosphogypsum slag pretreated powder, 50-150 parts of silicon source, 0.5-5 parts of stabilizer, 0.1-5 parts of surfactant and 1000-2000 parts of solvent.

[0007] The stabilizer is a structure shown in formula 1:

[0008] Formula 1

[0009] R1 is selected from the group consisting of methyl, ethyl, propyl, tert-butyl, phenyl.

[0010] Further, the preparation method of the phosphogypsum slag pretreated powder is as follows: the phosphogypsum slag is ground and grinded through a 200-mesh screen to obtain the phosphogypsum slag pretreated powder, and the content of CaSO4·2H2O in the phosphogypsum slag pretreated powder should not exceed 5%.

[0011] Further, the silicon source is a mixture of tetraethyl orthosilicate and silicon dioxide, and the mass ratio of the two is 1:1.5.

[0012] Further, the surfactant is hexadecyl trimethyl ammonium bromide.

[0013] Further, the solvent is water.

[0014] Further, the stabilizer is any one of the compounds shown in the following structures:

[0015]

[0016] .

[0017] A preparation method of an aerogel thermal insulation material based on phosphogypsum slag solid waste, comprising the following steps:

[0018] S1. Gelation: the phosphogypsum slag pretreated powder, the silicon source, the stabilizer, and the surfactant are added into the solvent, and stirred and mixed uniformly at 40-90°C, the pH value is adjusted to 4-8, and the wet gel is formed by standing or slightly stirring to make the sol-gel transition occur;

[0019] S2. Aging: the wet gel is subjected to aging treatment at 50-90°C for 1-48 hours to form an aged wet gel;

[0020] S3. Solvent exchange: the aged wet gel is sequentially immersed in a water-alcohol mixed solvent and a pure alcohol solvent for solvent exchange treatment, each exchange time is 4-24 hours, and the exchange number is ≥2 times; the alcohol solvent is one or more of methanol, ethanol, or isopropanol;

[0021] S4. Atmospheric pressure drying: the gel after completing the solvent exchange is placed in an atmospheric pressure drying device and dried at 60-120°C until the solvent is completely volatilized, to obtain an aerogel thermal insulation material based on phosphogypsum slag solid waste.

[0022] Further, in the gelation process, the stirring speed is 100-500 rpm, and the gelation time is 0.5-8 hours; in the solvent exchange, the volume fraction of alcohol in the water-alcohol mixed solvent is 30%-70%.

[0023] Further, the normal pressure drying adopts a gradient temperature mode: drying at 40-60 DEG C for 2-6 hours, drying at 60-80 DEG C for 2-6 hours, drying at 80-100 DEG C for 2-8 hours, and drying at 100-120 DEG C for 1-4 hours.

[0024] A resource utilization method of an aerogel thermal insulation material based on phosphogypsum slag solid waste, the aerogel thermal insulation material based on phosphogypsum slag solid waste is used as a thermal insulation material in the fields of industry, building or pipeline.

[0025] Further, the aerogel thermal insulation material based on phosphogypsum slag solid waste is applied to:

[0026] an outer thermal insulation layer of an industrial furnace, a thermal equipment or a chemical storage tank;

[0027] a thermal insulation layer of an outer wall, a roof or a floor of a building;

[0028] a thermal insulation layer of a pipeline for petroleum, chemical industry or electric power;

[0029] a thermal insulation layer of a low-temperature cold insulation system.

[0030] An efficient low-carbon building material system based on resource utilization of phosphogypsum slag solid waste, comprising an aerogel thermal insulation material based on phosphogypsum slag solid waste as a core thermal insulation function layer, to realize comprehensive benefits of industrial solid waste resource recycling and building energy saving and consumption reduction.

[0031] The present application uses phosphogypsum slag solid waste as a core raw material, and has the following advantages compared with bentonite adsorption material: the bentonite adsorption material has limited thermal insulation performance in low-level thermal insulation application, is easy to absorb moisture, and may involve mining and processing energy consumption in the production process. The present application directly uses industrial solid waste phosphogypsum slag to prepare high-performance aerogel thermal insulation material, instead of using bentonite or other traditional materials. The phosphogypsum slag is used as a silicon source supplement and a structure reinforcing component, combined with a silicon source, a stabilizer and a surfactant, to form the aerogel through a silica sol-gel process.

[0032] In the solvent exchange and drying process of the aerogel, the capillary pressure in the gel is extremely easy to cause the shrinkage or collapse of the nano-porous structure. The stabilizer modifies the surface of the gel skeleton through its hydrophobic group (R1, aryl), significantly reduces the surface tension, thereby resisting the capillary pressure and maintaining the integrity of the porous structure. The silane group in the stabilizer molecule can strengthen the cross-linking strength of the gel skeleton. At the same time, R1 provides a steric hindrance effect, reduces particle agglomeration. The hydrophobic group forms a molecular barrier on the surface of the gel, reduces the hydrolysis erosion of water molecules, and improves the chemical stability of the gel in the subsequent water phase treatment and drying process. The Si-C bond has high hydrolysis stability and can resist the water phase environment in the gelation and solvent exchange process, ensuring that the structure of the stabilizer molecule is not destroyed.

[0033] The phosphogypsum slag pretreated powder described in the present application replaces part of the silicon source to provide calcium / sulfur element to enhance the skeleton strength. Direct consumption of industrial solid waste phosphogypsum reduces land occupation and environmental pollution, and replaces expensive pure silicon source (such as tetraethyl orthosilicate), significantly reducing the cost of raw materials. The content of CaSO4·2H2O in phosphogypsum is less than or equal to 5%, which ensures less impurities and avoids the destruction of gel network stability by crystallization water, ensuring the final aerogel porosity.

[0034] The silicon source described in the present application constructs the main body of the siloxane (-Si-O-Si-) three-dimensional nanoporous skeleton. Hydrolysis of tetraethyl orthosilicate provides active silicon hydroxyl groups to form an initial gel network; silica nanoparticles fill and enhance the rigidity of the skeleton. By optimizing the pore size distribution and porosity at a specific ratio (1:1.5), an ultra-low thermal conductivity is achieved. The mixed use is less expensive than pure tetraethyl orthosilicate, while ensuring better performance than traditional materials.

[0035] The surfactant described in the present application promotes the uniform dispersion of phosphogypsum powder and silica in the solvent, preventing agglomeration. The surfactant forms micelles, guiding the formation of uniform mesoporous structures and optimizing the thermal insulation performance. It ensures the close combination of phosphogypsum and silicon source, avoiding defects that cause the thermal conductivity to rise. Together with the stabilizer, it maintains the stability of the sol and promotes the controllable gelation process.

[0036] Compared with the prior art, the present application has the following beneficial effects:

[0037] 1. Resource recycling and environmental protection benefits: By converting industrial solid waste phosphogypsum slag into a core raw material, the pollution caused by its storage is significantly reduced, realizing the resource utilization of solid waste. Compared with traditional aerogels that rely on high-purity silicon sources, the present application replaces part of the silicon source with phosphogypsum slag, reducing the dependence on primary mineral resources and promoting the low-carbon recycling of industrial solid waste in the building materials field.

[0038] 2. Production cost optimization: Using phosphogypsum slag as a low-cost raw material, combined with a normal pressure drying process, simplifies the production process and reduces energy consumption. At the same time, the synergistic effect of stabilizers and surfactants improves process stability, reduces waste caused by structural collapse, and reduces the overall production cost of aerogels.

[0039] 3. Improved comprehensive performance of materials: The optimized formula forms a more uniform nanoporous structure, significantly reducing the thermal conductivity and improving the thermal insulation efficiency. The hydrophobic modification of the stabilizer enhances the rigidity of the gel skeleton, making it more resistant to external deformation; at the same time, it reduces the hydrolytic degradation of the material in the use environment, prolonging the service life. The material is lightweight, low thermal conductivity, and weather-resistant, and can be widely used in building, industrial equipment, and pipeline insulation scenarios, solving the problem of moisture absorption and short service life of traditional materials (such as rock wool). BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1The stabilizer 1 of the present application is characterized in that 1 HNMR chart. DETAILED DESCRIPTION

[0041] The technical solutions of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] Synthesis Example 1

[0043] Synthesis of the stabilizer 1:

[0044] ;

[0045] First step: under nitrogen atmosphere, 20.00 g of raw material 1, 49.91 g of raw material 2, 3.68 g of tris(dibenzylideneacetone)dipalladium, 37.05 g of potassium carbonate, 1.36 g of tri-tert-butylphosphine and 300 g of toluene were sequentially added into the reaction system, the temperature was raised to 120℃, and the reaction was refluxed for 12 h; after the reaction was completed, the temperature was slightly lowered, diatomite was used for filtration to remove the salt and catalyst, the filtrate was cooled to room temperature, washed with water for three times, the organic phase was reserved, and then the water phase was extracted with ethyl acetate; after the organic phases were combined, anhydrous magnesium sulfate was used for drying, rotary evaporation, and silica gel column chromatography was performed with petroleum ether and ethyl acetate mixture as eluent to obtain 38.59 g of intermediate 1.

[0046] Second step: under nitrogen atmosphere, 38.59 g of intermediate 1, 54.30 g of potassium phosphate trihydrate, 0.12 g of pyridine-2-carboxylic acid, 1 g of CuI and 350 g of DMSO were sequentially added into the reaction system, stirred uniformly, 100 g of DMSO solution containing 31.82 g of raw material 3 was slowly added dropwise, stirred uniformly, the temperature was raised to 85℃, and the reaction was heated for 16 h; after cooling, the reaction mixture was extracted with ammonia solution and methyl tert-butyl ether, the organic phase was washed with water for five times, and then washed with saturated NaCl solution for two times; finally, the combined organic phase was dried with anhydrous magnesium sulfate, filtered, rotary evaporated, and column chromatography was performed with petroleum ether and ethyl acetate mixture as eluent, rotary evaporated to obtain 46.65 g of intermediate 2.

[0047] Third step: under nitrogen atmosphere, 46.65 g of intermediate 2, 27.23 g of raw material 4, 2.30 g of tris(dibenzylideneacetone)dipalladium, 23.12 g of potassium carbonate, 0.8 g of tri-tert-butylphosphine and 500 g of toluene were sequentially added into the reaction system, the temperature was raised to 120°C, and the reaction was refluxed for 12 h; after the reaction was completed, the temperature was slightly lowered, diatomite was used for filtration to remove the salt and catalyst, the filtrate was cooled to room temperature, washed with water for three times, the organic phase was reserved, and then the water phase was extracted with ethyl acetate; after the organic phases were combined, anhydrous magnesium sulfate was used for drying, rotary evaporation was performed, and silica gel column chromatography was performed with petroleum ether and ethyl acetate mixture as the eluent to obtain 47.46 g of stabilizer 1.

[0048] Structure identification:

[0049] M / Z [MS+H] of intermediate 1 + : 379;

[0050] M / Z [MS+H] of intermediate 2 + : 558;

[0051] M / Z [MS+H] of stabilizer 1 + : 732;

[0052] 1H NMR of stabilizer 1-CDCl3: δ 7.76-7.69 (m, 1H), 7.57 (m, 1H), 7.38-7.27 (m, 6H), 7.32-7.16 (m, 4H), 7.15 (m, 2H), 7.08 (m, 1H), 6.93 (d, 1H), 6.86 (dd, 1H), 6.78 (dd, 1H), 6.47 (m, 1H), 5.70 (d, 1H), 5.59 (d, 1H), 3.87 (m, 1H), 3.75 (m, 1H), 3.56 (m, 1H), 2.81 (m, 2H), 2.71-2.47 (m, 1H), 2.49 (s, 1H), 2.49 (d, 3H), 2.10-1.84 (m, 3H), 1.84-1.67 (m, 1H), 0.29-0.14 (m, 18H).

[0053] Synthesis examples 2-5

[0054] Stabilizers 2-5 were sequentially synthesized in synthesis examples 2-5, and the synthesis method of synthesis example 1 was referred to, and raw material 3 therein was replaced, and the rest was the same as synthesis example 1. The structures of raw material 3, stabilizers 2-5, and M / Z [MS+H] + The data are shown in Table 1.

[0055] Table 1. Structures of raw material 3, stabilizers 2-5, and M / Z [MS+H] involved in synthesis examples 2-5+ Data.

[0056]

[0057] Example 1

[0058] Preparation of a phosphogypsum slag solid waste-based aerogel thermal insulation material:

[0059] Raw material preparation (by mass fraction):

[0060] Phosphogypsum slag pretreated powder 100 parts (phosphogypsum slag is ground and sieved through a 200-mesh screen, and the CaSO4·2H2O content is measured to be ≤3.5%); silicon source is a mixture of tetraethyl orthosilicate and silicon dioxide, 100 parts in total (mass ratio 1:1.5, i.e. tetraethyl orthosilicate 40 parts, silicon dioxide 60 parts); stabilizer (selected from the stabilizer prepared in Synthesis Example 1) 12.0 parts; surfactant (selected from cetyltrimethylammonium bromide) 3 parts; solvent (selected from water) 1500 parts.

[0061] Preparation method:

[0062] S1. Gelation: phosphogypsum slag pretreated powder, silicon source, stabilizer 1, cetyltrimethylammonium bromide are added to deionized water, and stirred and mixed at 300 rpm under constant temperature water bath at 70°C. Adjust the pH to 6.0 (use 0.1M HCl or NaOH solution), continue to stir for 4 hours to form a uniform sol, stand for 1 hour to complete the sol-gel transition, and form a wet gel.

[0063] S2. Aging: the wet gel is aged in a 70°C oven for 24 hours to form an aged wet gel.

[0064] S3. Solvent exchange: 1) immerse the aged wet gel in an ethanol-water mixed solvent (ethanol volume fraction 50%), stand at 25°C for 12 hours; 2) transfer to pure ethanol solvent, stand at 25°C for 12 hours; repeat steps S3-1 and S3-2 twice, a total of 3 times of solvent exchange.

[0065] S4. Normal pressure drying: adopt gradient temperature rising mode: 50°C for 4 hours, 70°C for 4 hours, 90°C for 5 hours, 110°C for 3 hours, until the solvent is completely volatilized, to obtain a white block-shaped phosphogypsum slag solid waste-based aerogel thermal insulation material.

[0066] Examples 2-5

[0067] In Examples 2-5, a phosphogypsum slag solid waste-based aerogel thermal insulation material is prepared, and the preparation method of Example 1 is referred to, and the stabilizer therein is replaced by stabilizers 2-5 prepared in Synthesis Examples 2-5 in turn, and the rest remains the same as in Example 1.

[0068] Comparative Example 1

[0069] A kind of preparation of aerogel thermal insulation material based on phosphogypsum slag solid waste, with reference to the preparation method of Example 1, without adding the stabilizer therein, the rest remains the same as Example 1.

[0070] Comparative Example 2

[0071] A kind of preparation of aerogel thermal insulation material based on phosphogypsum slag solid waste, with reference to the preparation method of Example 1, without adding the silica therein, the rest remains the same as Example 1.

[0072] Comparative Example 3

[0073] A kind of preparation of aerogel thermal insulation material based on phosphogypsum slag solid waste, with reference to the preparation method of Example 1, the mass fraction of the phosphogypsum slag pretreatment powder therein is replaced by 50 parts, the rest remains the same as Example 1.

[0074] Performance test:

[0075] 1. Thermal conductivity test: a kind of aerogel thermal insulation material based on phosphogypsum slag solid waste prepared in the example and comparative example is tested for thermal conductivity according to GB / T10294-2008, and the data is shown in Table 2.

[0076] 2. Deformation test: a kind of aerogel thermal insulation material based on phosphogypsum slag solid waste prepared in the example and comparative example is modified into a sample with a length of 330 mm, a width of 122 mm and a height of 3 mm, and is pressurized to 0.25 MPa (loading rate 2 mm / min, preloading force 3 N) using a mechanical property testing machine. After the test is completed, the deformation-stress curve is derived, and the deformation value corresponding to the stress of 0.25 MPa is obtained. The data is shown in Table 2.

[0077] 3. Mass loss rate test: a kind of aerogel thermal insulation material based on phosphogypsum slag solid waste prepared in the example and comparative example is tested for mass loss rate according to GB / T34336-2017, and the data is shown in Table 2.

[0078] Table 2. Performance test data of a kind of aerogel thermal insulation material based on phosphogypsum slag solid waste prepared in the example and comparative example.

[0079] Thermal conductivity at room temperature W / (m·k) Deformation value corresponding to stress of 0.25 MPa / % Mass loss rate / % Example 1 0.018 50.42 0.25 Example 2 0.017 61.05 0.23 Example 3 0.019 55.04 0.28 Example 4 0.016 63.56 0.20 Example 5 0.010 58.79 0.30 Comparative Example 1 0.025 30.58 0.86 Comparative Example 2 0.030 32.67 0.79 Comparative Example 3 0.035 29.67 0.51

[0080] The thermal conductivity of the examples at room temperature is significantly lower than that of the comparative examples, indicating that the addition of stabilizers, sufficient phosphogypsum powder and silicon dioxide can effectively optimize the porous structure of the material and improve the thermal insulation performance. The comparative examples have higher thermal conductivity and lower thermal insulation effect due to the lack of key ingredients. The deformation value of the examples under 0.25 MPa pressure is generally higher than that of the comparative examples, indicating that the synergistic effect of stabilizers and silicon dioxide enhances the rigidity of the gel skeleton and the resistance to external force deformation is stronger. The comparative examples are more prone to compression deformation due to the lack of ingredients, resulting in a loose structure. The mass loss rate of the examples is much lower than that of the comparative examples, verifying that the hydrophobic modification of the stabilizer and the pretreatment of the phosphogypsum can significantly improve the chemical stability of the material and reduce degradation during use. The durability of the comparative examples is significantly reduced due to the lack of stabilizers or adjustment of the formula. The formula of the examples is superior to that of the comparative examples in terms of thermal insulation, mechanical strength and durability, confirming the key role of stabilizers in maintaining the nanostructure of aerogels and the improvement of comprehensive performance by a complete raw material system.

[0081] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An aerogel insulation material based on phosphogypsum slag solid waste, characterized in that, The raw materials contain the following parts by weight: 100 parts of phosphogypsum residue pretreated powder, 50-150 parts of silicon source, 0.5-5 parts of stabilizer, 0.1-5 parts of surfactant, and 1000-2000 parts of solvent. The stabilizer has the structure shown in Formula 1: Formula 1 R1 is selected from: methyl, ethyl, propyl, tert-butyl, phenyl; The silicon source is a mixture of tetraethyl orthosilicate and silicon dioxide, with a mass ratio of 1:1.

5.

2. The aerogel insulation material based on phosphogypsum slag solid waste as described in claim 1, characterized in that, The preparation method of the phosphogypsum residue pretreated powder is as follows: the phosphogypsum residue is crushed and ground and passed through a 200-mesh sieve to obtain the phosphogypsum residue pretreated powder, and the content of CaSO4·2H2O in the phosphogypsum residue pretreated powder shall not exceed 5%.

3. The aerogel insulation material based on phosphogypsum slag solid waste as described in claim 1, characterized in that, The surfactant is hexadecyltrimethylammonium bromide; The solvent is water.

4. A method for preparing an aerogel thermal insulation material based on phosphogypsum slag solid waste as described in any one of claims 1-3, characterized in that, Includes the following steps: S1. Gelation: Add the pretreated phosphogypsum residue powder, silicon source, stabilizer, and surfactant to the solvent, stir and mix evenly at 40-90℃, adjust the pH value to 4-8, and let it stand or stir slightly to allow it to undergo sol-gel transformation to form a wet gel. S2. Aging: The wet gel is aged at 50-90℃ for 1-48 hours to form an aged wet gel; S3. Solvent exchange: The aged wet gel is sequentially immersed in a water-alcohol mixed solvent and a pure alcohol solvent for solvent exchange treatment. Each exchange time is 4-24 hours, and the number of exchanges is ≥2 times. The alcohol solvent is one or more of methanol, ethanol, or isopropanol. S4. Atmospheric pressure drying: The gel after solvent exchange is placed in an atmospheric pressure drying device and dried at 60-120℃ until the solvent is completely evaporated, to obtain an aerogel thermal insulation material based on phosphogypsum slag solid waste.

5. The method for preparing an aerogel insulation material based on phosphogypsum slag solid waste according to claim 4, characterized in that, During the gelation process, the stirring speed is 100-500 rpm and the gelation time is 0.5-8 hours; during the solvent exchange, the volume fraction of alcohol in the water-alcohol mixed solvent is 30%-70%.

6. The method for preparing an aerogel insulation material based on phosphogypsum slag solid waste according to claim 4, characterized in that, The atmospheric pressure drying adopts a gradient temperature rise mode: drying at 40-60℃ for 2-6 hours, drying at 60-80℃ for 2-6 hours, drying at 80-100℃ for 2-8 hours, and drying at 100-120℃ for 1-4 hours.

7. A method for resource utilization of an aerogel thermal insulation material based on phosphogypsum slag solid waste as described in any one of claims 1-3, characterized in that, The aforementioned aerogel insulation material based on phosphogypsum slag solid waste is used as a thermal insulation material in industrial, building, or pipeline applications.

8. A method for resource utilization of aerogel insulation material based on phosphogypsum slag solid waste as described in claim 7, characterized in that, The aforementioned aerogel insulation material based on phosphogypsum slag solid waste is applied to: External insulation layer for industrial furnaces, thermal equipment, and chemical storage tanks; Thermal insulation layers for building exterior walls, roofs, and floors; Insulation layers for petroleum, chemical, and power pipelines; Insulation layer of low-temperature cold preservation system.

9. A high-efficiency, low-carbon building material system based on the resource utilization of phosphogypsum slag solid waste, characterized in that, The invention incorporates an aerogel insulation material based on phosphogypsum slag solid waste as described in any one of claims 1-3 as the core thermal insulation functional layer, thereby achieving the comprehensive benefits of industrial solid waste resource recycling and building energy conservation and consumption reduction.

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