Method for preparing heat insulation material by resource utilization of phosphogypsum

Abstract

The invention discloses a method for preparing a thermal insulation material by resource utilization of ardealite, and relates to the technical field of non-metallic materials. Comprising the following steps: screening a phosphogypsum raw material to remove impurities; carrying out heat treatment on the screened ardealite raw material to remove moisture so as to obtain ardealite particles with uniform granularity; the temperature range of the heat treatment is 300-500 DEG C, and the treatment time is 1-3 hours. A sol-gel method is adopted to stably fix antibacterial and mildew-proof components on the surfaces of ardealite particles, so that the modified ardealite keeps excellent heat insulation performance, the heat insulation effect of the material is further enhanced through surface modification and reasonable proportioning of the composite material, and the material also has good environmental adaptability and is suitable for popularization and application. The device is especially suitable for being used in humid and warm environments where mould breeding easily occurs, so that the device can stably work for a long time in various environments.

Description

Technical Field

[0001] The invention relates to the technical field of non-metallic materials, in particular to a method for making a heat-insulating material using phosphogypsum as a resource. Background Art

[0002] Phosphogypsum is a by-product produced during the production of phosphate fertilizers. Its main component is calcium sulfate dihydrate, which also contains small amounts of phosphorus, magnesium, aluminum and other elements. With the continuous expansion of the scale of phosphate fertilizer production and phosphoric acid production, the accumulation of phosphogypsum has increased year by year, becoming an industrial waste that needs to be treated urgently. According to relevant statistics, the global annual production of phosphogypsum is about 250 million tons, most of which is piled up or treated, resulting in increasingly serious problems of resource waste and environmental pollution. With increasingly stringent environmental protection regulations, the resource utilization of phosphogypsum has gradually become an important topic for the development of the industry. In recent years, researchers have proposed a variety of methods for the resource utilization of phosphogypsum, mainly focusing on the fields of building materials, soil improvement, and environmental remediation. For example, phosphogypsum is widely used in the production of gypsum boards, compound fertilizers, cement and soil conditioners.

[0003] In addition to traditional applications, more and more research has begun to focus on the high-value utilization of phosphogypsum, among which the application of phosphogypsum as a thermal insulation material has become a new development direction. Studies have shown that through appropriate modification, phosphogypsum has good performance in low thermal conductivity, flame retardancy, pressure resistance, etc. Therefore, the use of phosphogypsum to prepare thermal insulation materials can not only effectively alleviate the environmental pressure caused by the accumulation of phosphogypsum, but also provide an environmentally friendly and efficient thermal insulation material for the construction industry.

[0004] However, in the prior art, the application of phosphogypsum in thermal insulation materials still faces some challenges, especially in terms of the material's stability, moisture resistance, and antibacterial and mildew-proof properties. Although some phosphogypsum thermal insulation materials are compounded with thermal insulation materials such as expanded perlite and polymers to improve the thermal conductivity and compressive strength of the materials, these composite materials generally lack adaptability to humid environments. In a humid or high-temperature environment, phosphogypsum materials easily absorb moisture and expand, causing their structure to be damaged and losing their thermal insulation function. In addition, phosphogypsum may also breed bacteria and mold during long-term use, which poses a potential threat to the material's service life and environmental hygiene. Therefore, how to introduce antibacterial, mildew-proof and other functions into phosphogypsum thermal insulation materials to improve their application effect in humid environments has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the problems existing in the above background technology, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to solve the problem of insufficient stability and durability of the phosphogypsum thermal insulation material in a humid environment in the prior art.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: In the first aspect, an embodiment of the present invention provides a method for producing an insulating material for recycling phosphogypsum resources, comprising: screening phosphogypsum raw materials to remove impurities; subjecting the screened phosphogypsum raw materials to heat treatment to remove moisture and obtain phosphogypsum particles with uniform particle size; the heat treatment temperature range is 300°C to 500°C, and the treatment time is 1 to 3 hours; and dynamic temperature control technology is introduced during the heat treatment process to adjust the temperature according to the moisture content monitored in real time.

[0008] As a preferred embodiment of the method for making thermal insulation materials of phosphogypsum resources according to the present invention, the heat treatment temperature is 350°C to 450°C, the treatment time is 1.5 hours to 2.5 hours, and the moisture content of the phosphogypsum particles is reduced to below 3%; the dynamic temperature control technology includes a feedback adjustment mechanism based on the real-time moisture content to achieve optimal matching of the treatment temperature and time.

[0009] As a preferred scheme of the method for resource utilization of phosphogypsum as an insulating material of the present invention, it also includes: performing antibacterial and mildew-proof surface modification on the phosphogypsum particles, combining the antibacterial and mildew-proof components with the surface of the phosphogypsum particles; the antibacterial and mildew-proof components are metal compounds of silver, copper or zinc; the mass ratio of the antibacterial and mildew-proof components is 0.1% to 5% of the phosphogypsum particles.

[0010] As a preferred scheme of the method for resource utilization of phosphogypsum as an insulating material of the present invention, the antibacterial and mildew-proof surface modification treatment adopts a sol-gel method, in which silver ions, zinc ions or copper ion compounds are dissolved in a solution with a pH of 5 to 7, and an interfacial reaction occurs with the phosphogypsum particles to form a stable antibacterial layer; the surface coverage of the antibacterial and mildew-proof component is 70% to 95%.

[0011] As a preferred scheme of the method for resource utilization of phosphogypsum as an insulating material of the present invention, the mass ratio of the antibacterial and mildew-proof component is 0.5% to 3% of the phosphogypsum particles, and the antibacterial properties of the material are optimized by controlling the metal ion concentration.

[0012] As a preferred embodiment of the method for making thermal insulation materials by recycling phosphogypsum as described in the present invention, it also includes: mixing the surface-modified phosphogypsum particles with other thermal insulation materials to obtain a composite material; the thermal insulation material includes expanded perlite, polymer-based materials or low thermal conductivity mineral particles, and the mass ratio of the phosphogypsum particles to the expanded perlite is 3:1 to 7:1.

[0013] As a preferred scheme of the method for resource utilization of phosphogypsum as an insulating material of the present invention, the mixing ratio of the composite material is 40% to 70% by mass of phosphogypsum particles, expanded perlite and polymer-based material: 10% to 30% by mass: 10% to 20%; the composite material is formed by a mold to obtain an insulating material board or block in the desired shape; the mold forming process includes press molding or injection molding, the pressure is 5MPa to 20MPa, and the molding temperature is 40°C to 80°C.

[0014] As a preferred embodiment of the method for making thermal insulation materials of phosphogypsum resource utilization according to the present invention, the composite material after mold forming is dried and cured; the drying temperature is 40°C to 70°C, and the curing time is 4 to 12 hours; the curing process is carried out in an environment with a relative humidity of 40% to 60%, and the density of the obtained composite material is 0.3g / cm³ to 1.5g / cm³.

[0015] As a preferred solution of the method for resource utilization of phosphogypsum as an insulating material of the present invention, the polymer-based material is polyurethane or polystyrene, and a blending method is used to ensure uniform dispersion and form a stable microstructure.

[0016] As a preferred solution of the method for insulating material for resource utilization of phosphogypsum described in the present invention, the dynamic temperature control technology in the heat treatment process realizes precise temperature control by real-time moisture content monitoring, and dynamically adjusts the temperature range of the heat treatment through feedback.

[0017] The beneficial effects of the present invention are as follows: the present invention performs antibacterial and mildew-proofing modification on the surface of phosphogypsum particles, uses metal compounds such as silver, copper or zinc as antibacterial and mildew-proofing components, and combines them with the surface of phosphogypsum particles, thereby significantly improving the antibacterial and mildew-proofing properties of the material.

[0018] At the same time, the present invention adopts the sol-gel method to stably fix the antibacterial and mildew-proof components on the surface of phosphogypsum particles, so that the modified phosphogypsum maintains excellent thermal insulation performance. The thermal insulation effect of the material is further enhanced by surface modification and the reasonable ratio of the composite material, and it also has good environmental adaptability, and is particularly suitable for use in humid, warm and other environments prone to mold growth, so that it can work stably for a long time in a variety of environments. The present invention effectively solves the problem of insufficient stability and durability of phosphogypsum thermal insulation materials in humid environments in the prior art, and improves its extensiveness and long-term use effect in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A flow chart of a method for resource utilization of phosphogypsum as an insulating material. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0024] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0025] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example 1 Reference Figure 1 , which is the first embodiment of the present invention, provides a thermal insulation performance experiment of phosphogypsum particles, and the materials used include screened phosphogypsum raw materials, expanded perlite, a mold, a compression molding machine, a heat flow meter and an oven. The specific operations are as follows: Select phosphogypsum raw materials with smaller particles and less impurities, and screen them through a sieve to remove impurities with particle sizes less than 0.5 mm and greater than 5 mm. The raw material particles after screening range from 0.5 mm to 5 mm.

[0028] The screened phosphogypsum particles are placed in a heat treatment furnace.

[0029] Dynamic temperature control technology is introduced during the heat treatment process to monitor the moisture content of phosphogypsum particles in real time and automatically adjust the temperature according to the moisture changes. The initial temperature is set at 350°C, the dynamic adjustment range is 350°C to 400°C, and the treatment time is 1.5 hours to ensure that the moisture content is reduced to less than 3%.

[0030] Specifically, at the initial stage of heat treatment, the preset temperature is 350°C, which is a relatively conservative temperature that can effectively start the dehydration process of phosphogypsum particles while avoiding excessively high temperatures that cause particle cracking. In the initial stage, the temperature control system will maintain a relatively low temperature to slow down the evaporation rate of water and avoid excessive evaporation that causes the outer layer of the particles to dehydrate too quickly and crack.

[0031] As the moisture content gradually decreases, the temperature control system automatically adjusts the temperature according to the moisture data. When the moisture content decreases to a certain level, the furnace temperature will be gradually increased (for example, to 400°C) to accelerate the evaporation of the remaining moisture.

[0032] It should be noted that high temperature and rapid evaporation of water will cause an overly hard shell to form on the surface of phosphogypsum particles, leading to cracking. Through dynamic temperature control technology, when it is detected that the water is about to be completely removed, the temperature will be lowered in time to avoid thermal expansion and cracking of particles caused by excessive temperature differences.

[0033] In order to ensure that the surface and internal moisture of phosphogypsum particles are removed simultaneously, a progressive temperature control strategy is adopted. For example, the temperature is 350°C in the initial stage to ensure gentle dehydration, and then the temperature is increased to 400°C in the later stage to accelerate dehydration, ultimately ensuring that the surface moisture of the particles is less than 3%.

[0034] Dynamic adjustment of temperature helps to improve dehydration efficiency and prevent cracking of phosphogypsum particles. Dynamic temperature control ensures efficient use of energy, avoids energy waste at excessively high temperatures, and reduces the total energy consumption of the heat treatment process.

[0035] The heat-treated phosphogypsum particles were mixed with expanded perlite in a mass ratio of 4:1. The two materials were evenly stirred using a mixer.

[0036] The mixed composite material was placed in a mold and molded using a press molding machine at a temperature of 60°C, with the pressure set to 10 MPa and the molding time being 10 minutes to produce an insulation board with a thickness of 10 mm.

[0037] The molded material was dried in an oven with the temperature set at 70°C, the drying time being 12 hours, and the curing time being 4 hours.

[0038] The thermal conductivity of the material was tested using the heat flow meter method. The test environment temperature was set to 25°C and the humidity was 50%. Multiple measurements were performed at 25°C, 35°C, and 45°C. Each step of the process was strictly carried out in accordance with the steps in the invention. In order to ensure the accuracy of the data, multiple groups of experiments were conducted, and the processing results and related data of each group of experiments were recorded, as shown in Table 1: Table 1 Thermal conductivity test results of thermal insulation materials

[0039] As can be seen from Table 1, with the increase of phosphogypsum particle content, the thermal conductivity of the composite material gradually decreases. In particular, when the phosphogypsum particle content reaches 70%, the thermal conductivity drops to 0.025 W / m·K, showing excellent thermal insulation performance. The introduction of dynamic temperature control technology improves the stability and efficiency of the heat treatment process, allowing the phosphogypsum particles to be dehydrated more evenly during the treatment process, further enhancing the thermal insulation performance.

[0040] The stability test also shows that the composite material can still maintain good thermal stability under changes in temperature and humidity, and the stability is maintained at more than 92%. This result shows that the thermal insulation material of the present invention has good thermal isolation performance and can effectively cope with temperature changes in different environments.

[0041] Example 2 The second embodiment of the present invention provides an antibacterial and mildew-proof performance experiment of phosphogypsum particles to verify the antibacterial and mildew-proof performance of the phosphogypsum particle composite material. The specific steps are as follows: Select phosphogypsum raw materials with smaller particles and less impurities, and screen them through a sieve to remove impurities with particle sizes less than 0.5 mm and greater than 5 mm. The raw material particles after screening range from 0.5 mm to 5 mm.

[0042] The screened phosphogypsum particles are placed in a heat treatment furnace.

[0043] Dynamic temperature control technology is introduced during the heat treatment process to monitor the moisture content of phosphogypsum particles in real time and automatically adjust the temperature according to the moisture changes. The initial temperature is set at 350°C, the dynamic adjustment range is 350°C to 400°C, and the treatment time is 1.5 hours to ensure that the moisture content is reduced to less than 3%.

[0044] Specifically, at the initial stage of heat treatment, the preset temperature is 350°C, which is a relatively conservative temperature that can effectively start the dehydration process of phosphogypsum particles while avoiding excessively high temperatures that cause particle cracking. In the initial stage, the temperature control system will maintain a relatively low temperature to slow down the evaporation rate of water and avoid excessive evaporation that causes the outer layer of the particles to dehydrate too quickly and crack.

[0045] As the moisture content gradually decreases, the temperature control system automatically adjusts the temperature according to the moisture data. When the moisture content decreases to a certain level, the furnace temperature will be gradually increased (for example, to 400°C) to accelerate the evaporation of the remaining moisture.

[0046] It should be noted that high temperature and rapid evaporation of water will cause an overly hard shell to form on the surface of phosphogypsum particles, leading to cracking. Through dynamic temperature control technology, when it is detected that the water is about to be completely removed, the temperature will be lowered in time to avoid thermal expansion and cracking of particles caused by excessive temperature differences.

[0047] In order to ensure that the surface and internal moisture of phosphogypsum particles are removed simultaneously, a progressive temperature control strategy is adopted. For example, the temperature is 350°C in the initial stage to ensure gentle dehydration, and then the temperature is increased to 400°C in the later stage to accelerate dehydration, ultimately ensuring that the surface moisture of the particles is less than 3%.

[0048] Dynamic adjustment of temperature helps to improve dehydration efficiency and prevent cracking of phosphogypsum particles. Dynamic temperature control ensures efficient use of energy, avoids energy waste at excessively high temperatures, and reduces the total energy consumption of the heat treatment process.

[0049] A silver ion compound (such as silver nitrate AgNO3) is dissolved in an aqueous solution with a pH of 6.0, and the concentration is controlled at 0.5 M. An appropriate amount of alcohol solvent and gelling agent are added to ensure that the silver ions are stably suspended in the solution.

[0050] Add the heat-treated phosphogypsum particles (with a particle size range of 0.5 mm to 5 mm) into the antibacterial solution and stir evenly so that their surfaces can fully contact the solution.

[0051] Through the sol-gel method, silver ions react with the surface of phosphogypsum particles to form a stable antibacterial layer.

[0052] The reaction is carried out at room temperature for 30 minutes to 1 hour to ensure that the silver ions are uniformly deposited on the surface of the particles.

[0053] The surface coverage of the phosphogypsum particles after antibacterial modification reaches 85%, and the mass ratio of the antibacterial and mildew-proof components is 2% of the phosphogypsum particles.

[0054] The antibacterial modified phosphogypsum particles were dried at 60 °C for 2 h to remove excess solvent from the surface and stabilize the antibacterial layer.

[0055] The antibacterial modified phosphogypsum particles and expanded perlite are mixed in a mass ratio of 3:1 to obtain a composite material.

[0056] Escherichia coli and Candida albicans were selected as test bacteria, and the antibacterial inhibition rate was determined by the inhibition ring method. Each group of experiments was measured three times, as follows: Table 2 Antibacterial and antifungal performance test results

[0057] It can be seen from the data in Table 2 that with the increase of silver ion content, the antibacterial performance of phosphogypsum particles is significantly improved. At a silver ion content of 1.0%, the antibacterial effect is very significant, and the inhibition rates of Escherichia coli and Candida albicans reach 85% and 90%, respectively. This shows that the present invention significantly enhances the antibacterial and mildew-proof ability of the material through surface modification treatment, and has obvious antibacterial advantages compared with conventional materials.

[0058] Example 3 The third embodiment of the present invention provides an environmental adaptability experiment of a composite material to verify the stability and adaptability of the composite material under different environmental conditions. The specific steps are as follows: Select phosphogypsum raw materials with smaller particles and less impurities, and screen them through a sieve to remove impurities with particle sizes less than 0.5 mm and greater than 5 mm. The raw material particles after screening range from 0.5 mm to 5 mm.

[0059] Dynamic temperature control technology is introduced during the heat treatment process to monitor the moisture content of phosphogypsum particles in real time and automatically adjust the temperature according to the moisture changes. The initial temperature is set at 350°C, the dynamic adjustment range is 350°C to 400°C, and the treatment time is 1.5 hours to ensure that the moisture content is reduced to less than 3%.

[0060] Specifically, at the initial stage of heat treatment, the preset temperature is 350°C, which is a relatively conservative temperature that can effectively start the dehydration process of phosphogypsum particles while avoiding excessively high temperatures that cause particle cracking. In the initial stage, the temperature control system will maintain a relatively low temperature to slow down the evaporation rate of water and avoid excessive evaporation that causes the outer layer of the particles to dehydrate too quickly and crack.

[0061] As the moisture content gradually decreases, the temperature control system automatically adjusts the temperature according to the moisture data. When the moisture content decreases to a certain level, the furnace temperature will be gradually increased (for example, to 400°C) to accelerate the evaporation of the remaining moisture.

[0062] It should be noted that high temperature and rapid evaporation of water will cause an overly hard shell to form on the surface of phosphogypsum particles, leading to cracking. Through dynamic temperature control technology, when it is detected that the water is about to be completely removed, the temperature will be lowered in time to avoid thermal expansion and cracking of particles caused by excessive temperature differences.

[0063] In order to ensure that the surface and internal moisture of phosphogypsum particles are removed simultaneously, a progressive temperature control strategy is adopted. For example, the temperature is 350°C in the initial stage to ensure gentle dehydration, and then the temperature is increased to 400°C in the later stage to accelerate dehydration, ultimately ensuring that the surface moisture of the particles is less than 3%.

[0064] Dynamic adjustment of temperature helps to improve dehydration efficiency and prevent cracking of phosphogypsum particles. Dynamic temperature control ensures efficient use of energy, avoids energy waste at excessively high temperatures, and reduces the total energy consumption of the heat treatment process.

[0065] A silver ion compound (such as silver nitrate AgNO3) is dissolved in an aqueous solution with a pH of 6.0, and the concentration is controlled at 0.5 M. An appropriate amount of alcohol solvent and gelling agent are added to ensure that the silver ions are stably suspended in the solution.

[0066] Add the heat-treated phosphogypsum particles (with a particle size range of 0.5 mm to 5 mm) into the antibacterial solution and stir evenly so that their surfaces can fully contact the solution.

[0067] Through the sol-gel method, silver ions react with the surface of phosphogypsum particles to form a stable antibacterial layer.

[0068] The reaction is carried out at room temperature for 30 minutes to 1 hour to ensure that the silver ions are uniformly deposited on the surface of the particles.

[0069] The surface coverage of the phosphogypsum particles after antibacterial modification reaches 85%, and the mass ratio of the antibacterial and mildew-proof components is 2% of the phosphogypsum particles.

[0070] The antibacterial modified phosphogypsum particles were dried at 60 °C for 2 h to remove excess solvent from the surface and stabilize the antibacterial layer.

[0071] Take antibacterial modified phosphogypsum particles, expanded perlite and polyurethane (or polystyrene) based materials, and mix them according to the mass ratio. The mass ratio of phosphogypsum particles to expanded perlite is 4:1, and the mass ratio of phosphogypsum particles to polymer based materials is 6:1.

[0072] The mixed material was placed in a mold and pressurized by a press molding machine at a pressure of 15 MPa for 10 minutes, and then dried in an oven at a temperature set to 70°C for 12 hours.

[0073] The composite materials were exposed to high temperature and high humidity (50°C, 80% RH) and low temperature and low humidity (-5°C, 30% RH) environments for 30 days. The compressive strength and thermal conductivity tests were performed every week. Part of the treatment results and related data of each group of experiments were recorded, as shown in Table 3: Table 3 Environmental adaptability test results

[0074] From the data in Table 3, it can be seen that the compressive strength and thermal conductivity of the composite material in different environments change little, showing excellent environmental adaptability. In particular, under high temperature and high humidity environments, the thermal conductivity and compressive strength of the composite material only decrease slightly, showing its strong stability. This shows that the composite material of the present invention can adapt to various harsh environments and maintain its efficient thermal insulation effect.

[0075] In summary, it can be seen that the present invention adopts the sol-gel method to stably fix the antibacterial and mildew-proof components on the surface of phosphogypsum particles, so that the modified phosphogypsum maintains excellent thermal insulation performance. The thermal insulation effect of the material is further enhanced by surface modification and the reasonable ratio of the composite material. It also has good environmental adaptability and is particularly suitable for use in humid, warm and other environments prone to mold growth, so that it can work stably for a long time in a variety of environments. The present invention effectively solves the problem of insufficient stability and durability of phosphogypsum thermal insulation materials in humid environments in the prior art, and improves its extensiveness and long-term use effect in practical applications.

[0076] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for making a thermal insulation material of phosphogypsum resource utilization, characterized in that: include: Screening of phosphogypsum raw materials to remove impurities; The screened phosphogypsum raw material is subjected to heat treatment to remove moisture, thereby obtaining phosphogypsum particles with uniform particle size; The temperature range of the heat treatment is 300°C to 500°C, and the treatment time is 1 to 3 hours; Dynamic temperature control technology is introduced during the heat treatment process to adjust the temperature according to the real-time monitored moisture content.

2. The method for making thermal insulation material of phosphogypsum resource utilization according to claim 1, characterized in that: The heat treatment temperature is 350°C to 450°C, the treatment time is 1.5 hours to 2.5 hours, and the moisture content of the phosphogypsum particles is reduced to less than 3%; The dynamic temperature control technology includes a feedback adjustment mechanism based on real-time moisture content to achieve optimal matching of processing temperature and time.

3. The method for making thermal insulation material of phosphogypsum resource utilization according to claim 1, characterized in that: Also includes: Performing antibacterial and anti-mildew surface modification on phosphogypsum particles, combining antibacterial and anti-mildew components with the surface of phosphogypsum particles; The antibacterial and anti-mildew component is a metal compound of silver, copper or zinc; The mass ratio of the antibacterial and anti-mildew component is 0.1% to 5% of the phosphogypsum particles.

4. The method for making thermal insulation material of phosphogypsum resource utilization according to claim 3, characterized in that: The antibacterial and mildew-proof surface modification treatment adopts a sol-gel method, wherein silver ions, zinc ions or copper ion compounds are dissolved in a solution with a pH of 5 to 7, and react with phosphogypsum particles to form a stable antibacterial layer; The surface coverage of the antibacterial and anti-mildew component is 70% to 95%.

5. The method for making thermal insulation material of phosphogypsum resource utilization according to claim 4, characterized in that: The mass ratio of the antibacterial and anti-mildew component is 0.5% to 3% of the phosphogypsum particles, and the antibacterial property of the material is optimized by controlling the metal ion concentration.

6. The method for making thermal insulation material of phosphogypsum resource utilization according to claim 3, characterized in that: Also includes: The surface-modified phosphogypsum particles are mixed with other thermal insulation materials to obtain a composite material; The thermal insulation material comprises expanded perlite, polymer-based materials or low thermal conductivity mineral particles, and the mass ratio of the phosphogypsum particles to the expanded perlite is 3:1 to 7:

1.

7. The method for making thermal insulation material of phosphogypsum resource utilization according to claim 6, characterized in that: The mixing ratio of the composite material is 40% to 70% by mass of phosphogypsum particles, expanded perlite and polymer-based material: 10% to 30% by mass: 10% to 20% by mass; The composite material is molded by a mold to obtain a heat-insulating material board or block in a desired shape; The mold forming process includes compression molding or injection molding, the pressure is 5MPa to 20MPa, and the molding temperature is 40°C to 80°C.

8. The method for making thermal insulation material of phosphogypsum resource utilization according to claim 7, characterized in that: The composite material after mold forming is dried and cured; Drying temperature is 40°C to 70°C, and curing time is 4 to 12 hours; The curing process is carried out in an environment with a relative humidity of 40% to 60%, and the density of the resulting composite material is 0.3g / cm³ to 1.5g / cm³.

9. The method for making thermal insulation material of phosphogypsum resource utilization according to claim 8, characterized in that: The polymer-based material is polyurethane or polystyrene, which is uniformly dispersed and forms a stable microstructure through a blending method.

10. The method for making thermal insulation material of phosphogypsum resource utilization according to claim 1, characterized in that: The dynamic temperature control technology in the heat treatment process achieves precise temperature control by real-time monitoring of moisture content, and dynamically adjusts the temperature range of the heat treatment through feedback.

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