A high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material and its preparation method

Abstract

This invention provides a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material and its preparation method, belonging to the technical field of phosphogypsum materials. This invention prepares a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material by mixing solid wastes such as phosphogypsum, fly ash, rice husk ash, and shrimp shells. This invention achieves high-value and efficient resource utilization of solid wastes such as phosphogypsum, fly ash, and rice husk ash. The super-insulating high-temperature resistant material obtained by this invention has a thermal conductivity of only 0.096 W / (m·K) at 1000℃, and its commercial value is as high as 9800 yuan / m². 3 This maximizes the high-value utilization of solid waste.

Description

Technical Field

[0001] This invention relates to the field of phosphogypsum materials technology, and in particular to a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material and its preparation method. Background Technology

[0002] Phosphogypsum is a major byproduct of wet-process phosphoric acid production; typically, 4-5 tons of phosphogypsum are produced for every ton of phosphoric acid produced. With the rapid development of the phosphate fertilizer and phosphate chemical industries, global annual phosphogypsum production has been increasing year by year, especially in China, where annual production has exceeded 100 million tons, and stockpiles are rising annually. This not only occupies a large amount of land resources but also brings serious environmental problems. Phosphogypsum contains small amounts of soluble phosphorus, fluorides, and heavy metals, and long-term stockpiling can pollute soil and water sources, potentially causing dust pollution and radioactive threats. Therefore, how to efficiently treat and utilize phosphogypsum has become an urgent issue to be addressed in the fields of environmental protection and resource utilization.

[0003] Although phosphogypsum's main component is calcium sulfate dihydrate (CaSO4·2H2O), theoretically possessing high utilization potential, its practical application is limited due to its high impurity content and unstable properties, resulting in low utilization rates in building materials, soil conditioners, and other fields, thus restricting its large-scale application. Furthermore, large-scale utilization of phosphogypsum faces technical challenges in impurity removal. Therefore, promoting research on the high-value and large-scale utilization of phosphogypsum is not only significant for resource recycling but can also effectively alleviate the ecological and environmental threats posed by its stockpiling.

[0004] In recent years, the comprehensive utilization of phosphogypsum has received widespread attention both domestically and internationally, with its use in the production of building materials such as lightweight wall panels, insulation boards, and cementitious materials gradually becoming a research hotspot. However, due to the presence of impurities in phosphogypsum, these applications often require complex pretreatment processes, increasing production costs. Meanwhile, in the chemical industry, research on the co-production of sulfuric acid and other high-value-added products using phosphogypsum is also emerging, providing new possibilities for the resource utilization of phosphogypsum.

[0005] CN116621562B discloses a lightweight, heat-insulating, and high-temperature-resistant material based on phosphogypsum and coal gangue, and its preparation method. This invention utilizes all solid waste as raw materials to prepare a lightweight, heat-insulating, and high-temperature-resistant material and its preparation method, realizing the high-value utilization of bulk solid waste. The resource utilization of phosphogypsum is a major challenge among all solid wastes, concerning the economic crisis of major phosphate chemical enterprises and the environmental governance of the middle and lower reaches of the Yangtze River. However, existing high-temperature-resistant materials have low phosphogypsum content, resulting in limited large-scale utilization; furthermore, during high-temperature calcination, the waste gas generated is not collected for secondary recycling, wasting SO2 gas resources.

[0006] Therefore, how to achieve high-value and efficient resource utilization of solid wastes such as phosphogypsum and obtain high-value high-temperature resistant materials is a technical problem that needs to be solved. Summary of the Invention

[0007] The purpose of this invention is to provide a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material and its preparation method, which can solve the technical problem that large amounts of solid waste such as phosphogypsum cannot be efficiently utilized.

[0008] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0009] This invention provides a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material, prepared from raw materials comprising the following parts by mass:

[0010]

[0011] The particle size of phosphogypsum A is <30μm, and the particle size range of phosphogypsum B is 30-75μm;

[0012] The contents of rice husk ash, shrimp shell powder, and binder are all 0.

[0013] Furthermore, the fly ash has a particle size ≤75μm, and the fly ash contains 6-12wt% C, 25-45wt% Al2O3, and 40-60wt% SiO2.

[0014] Furthermore, the CaSO4 content in phosphogypsum A and phosphogypsum B is 75–95 wt%.

[0015] Furthermore, the particle size of the rice husk ash is ≤2μm, and the SiO2 content in the rice husk ash is ≥70wt%.

[0016] Furthermore, the binder is phosphogypsum that has been treated at a high temperature of 200°C.

[0017] Furthermore, the particle size of the shrimp shell powder is ≤30μm.

[0018] This invention provides a method for preparing a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material, comprising the following steps:

[0019] (1) Mix phosphogypsum A, phosphogypsum B, fly ash, rice husk ash and shrimp shell powder to obtain an initial mixture;

[0020] (2) Mix the initial mixture, binder and water to obtain the mixture;

[0021] (3) After the mixture is trapped, it is pressed into shape and dried to obtain the initial blank;

[0022] (4) The initial green body is subjected to programmed heating and calcination to obtain a high-content phosphogypsum-based super-insulating porous high-temperature resistant material.

[0023] Furthermore, the time for acclimation is 0.5 to 5 hours, the pressure for pressing is 5 to 8 MPa, the drying temperature is 60 to 110°C, and the drying time is 18 to 36 hours.

[0024] Furthermore, the programmed heating calcination specifically includes: first heating the initial billet from 20-30°C to 300°C at a rate of 1-2°C / min, then heating it from 300°C to 800-1000°C at a rate of 2-5°C / min, and then heating it to 1100-1400°C at a rate of 5-8°C / min, and holding it at that temperature for 2-5 hours.

[0025] Furthermore, in steps (1) and (2), the mixing is carried out under stirring until the mixture is homogeneous.

[0026] The beneficial effects of this invention are:

[0027] (1) The present invention has a high phosphogypsum content, which can better realize the large-scale utilization of phosphogypsum. Since the decomposition temperature of phosphogypsum is higher than the lowest eutectic point of impurity elements, the phosphogypsum in the inner layer of the stacked state that has not been completely decomposed is stopped from decomposing due to being encapsulated by the liquid phase that appears too early in the raw material, which reduces the quality of cement. The present invention takes advantage of this defect and proposes a novel treatment scheme. The produced super-insulated porous high-temperature resistant material makes full use of impurity burn-off and liquid phase generation to achieve the purpose of in-situ pore formation. Through thermogravimetric analysis, it was found that the preparation of porous material does not prevent further decomposition of phosphogypsum. On the one hand, due to the generation of liquid phase, some impurities, including elements such as arsenic and selenium, will migrate into the liquid phase due to kinetic mechanisms; on the other hand, the liquid phase can promote the sintering and densification of porous high-temperature resistant material, and elements such as arsenic and selenium will be solidified inside the material, reducing the content of impurity components in the furnace gas.

[0028] (2) The present invention uses fly ash as raw material, and the carbon and other elements contained therein have a reducing decomposition effect on the calcination of phosphogypsum, which can reduce the calcination temperature of phosphogypsum. Therefore, there is no need to add reducing carbon powder and fuel carbon powder.

[0029] (3) The value of the high-dosage phosphogypsum material for preparing ultra-insulating and high-temperature resistant materials proposed in this invention far exceeds that of the cement industry. This invention studies ultra-insulating and high-temperature resistant materials with a thermal conductivity of only 0.096 W / (m·K) at 1000℃, and its commercial value is as high as 9800 yuan / m. 3 This maximizes the high-value utilization of solid waste. Detailed Implementation

[0030] This invention provides a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material, prepared from raw materials comprising the following parts by mass:

[0031]

[0032] The particle size of phosphogypsum A is <30μm, and the particle size range of phosphogypsum B is 30-75μm;

[0033] The contents of rice husk ash, shrimp shell powder, and binder are all 0.

[0034] In this invention, the content of phosphogypsum A is preferably 35 to 40 parts by weight, and more preferably 40 parts by weight.

[0035] In this invention, the content of phosphogypsum B is preferably 35 to 40 parts by weight, and more preferably 40 parts.

[0036] In this invention, the content of fly ash is preferably 8 to 12 parts by weight, and more preferably 10 parts by weight.

[0037] In this invention, the content of rice husk ash is preferably 2 to 9 parts by weight, and more preferably 5 to 8 parts by weight.

[0038] In this invention, the content of the adhesive, based on parts by weight, is preferably 3 to 9 parts, more preferably 4 to 7 parts.

[0039] In this invention, the water content is preferably 8 to 12 parts by mass, and more preferably 10 parts by mass.

[0040] In this invention, the particle size of the fly ash is preferably ≤75μm, the C content in the fly ash is 6-12wt%, preferably 8-10wt%; the Al2O3 content is 25-45wt%, preferably 30-40wt%; and the SiO2 content is 40-60wt%, preferably 45-55wt%.

[0041] In this invention, the CaSO4 content in phosphogypsum A and phosphogypsum B is 75-95 wt%, preferably 80-90 wt%, and more preferably 85 wt%.

[0042] In this invention, the preferred particle size of the rice husk ash is ≤2μm, and the SiO2 content in the rice husk ash is ≥70wt%.

[0043] In this invention, the binder is preferably phosphogypsum that has been treated at a high temperature of 200°C.

[0044] In this invention, the particle size of the shrimp shell powder is preferably ≤30μm.

[0045] This invention provides a method for preparing a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material, comprising the following steps:

[0046] (1) Mix phosphogypsum A, phosphogypsum B, fly ash, rice husk ash and shrimp shell powder to obtain an initial mixture;

[0047] (2) Mix the initial mixture, binder and water to obtain the mixture;

[0048] (3) After the mixture is trapped, it is pressed into shape and dried to obtain the initial blank;

[0049] (4) The initial green body is subjected to programmed heating and calcination to obtain a high-content phosphogypsum-based super-insulating porous high-temperature resistant material.

[0050] In this invention, the time for acclimating the material is 0.5 to 5 hours, preferably 2 to 4 hours; the pressure for pressing and molding is 5 to 8 MPa, preferably 6 MPa; the drying temperature is 60 to 110°C, preferably 90 to 100°C; and the drying time is 18 to 36 hours, preferably 24 hours.

[0051] In this invention, the programmed temperature rise calcination specifically includes: first raising the initial green body from 20-30°C to 300°C at a rate of 1-2°C / min, then raising it from 300°C to 800-1000°C at a rate of 2-5°C / min, and then raising it to 1100-1400°C at a rate of 5-8°C / min, and holding it at that temperature for 2-5 hours; preferably, the initial green body is first raised from 25°C to 300°C at a rate of 1°C / min, then raised it from 300°C to 900°C at a rate of 3°C / min, and then raised it to 1200°C at a rate of 8°C / min, and held at that temperature for 4 hours.

[0052] In this invention, in steps (1) and (2), the mixing is carried out under stirring until the mixture is homogeneous.

[0053] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0054] Example 1

[0055] (1) First, add 30 parts of phosphogypsum A (particle size ≤ 30 μm), 45 parts of phosphogypsum B (30 μm ≤ particle size ≤ 75 μm), 10 parts of fly ash (particle size ≤ 2 μm, 12 wt% ≥ C content ≥ 6 wt%), 10 parts of rice husk ash (particle size ≤ 2 μm) and 5 parts of shrimp shell powder (particle size ≤ 30 μm), stir evenly to obtain the initial mixture; then add 4 parts of deionized water, stir evenly to obtain the final mixture;

[0056] (2) The mixture is left to stand for 2 hours, pressed into shape, and dried at 110°C for 24 hours to obtain the initial blank;

[0057] (3) The initial blank is heated from room temperature to 300℃ at a rate of 1℃ / min, then heated to 800℃ at a rate of 2℃ / min, and then heated to 1100℃ at a rate of 5℃ / min. The temperature is held for 2 hours and then cooled to room temperature in the furnace to obtain a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material.

[0058] The high-content phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, including a room temperature compressive strength of 8.74 MPa, an apparent porosity of 57.2%, and a bulk density of 1.17 g / cm³. 3 Thermal conductivity 0.26 W / (m·K) (1000℃).

[0059] Example 2

[0060] (1) First, add 35 parts of phosphogypsum A (particle size ≤ 30 μm), 40 parts of phosphogypsum B (30 μm ≤ particle size ≤ 75 μm), 14 parts of fly ash (particle size ≤ 2 μm, 12 wt% ≥ C content ≥ 6 wt%), 9 parts of rice husk ash (particle size ≤ 2 μm) and 4 parts of shrimp shell powder (particle size ≤ 30 μm), stir evenly to obtain the initial mixture; then add 3 parts of binder and 4 parts of deionized water, stir evenly to obtain the final mixture;

[0061] (2) The mixture is left to stand for 2 hours, pressed into shape, and dried at 110°C for 24 hours to obtain the initial blank;

[0062] (3) The initial blank is heated from room temperature to 300℃ at a rate of 1℃ / min, then heated to 900℃ at a rate of 3℃ / min, and then heated to 1200℃ at a rate of 6℃ / min. The temperature is held for 2 hours and then cooled to room temperature in the furnace to obtain a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material.

[0063] The high-content phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, including a room temperature compressive strength of 9.27 MPa, an apparent porosity of 60.17%, and a bulk density of 1.07 g / cm³. 3 Thermal conductivity 0.11 W / (m·K) (1000℃).

[0064] Example 3

[0065] (1) First, add 40 parts of phosphogypsum A (particle size ≤ 30 μm), 35 parts of phosphogypsum B (30 μm ≤ particle size ≤ 75 μm), 14 parts of fly ash (particle size ≤ 2 μm, 12 wt% ≥ C content ≥ 6 wt%), 8 parts of rice husk ash (particle size ≤ 2 μm) and 4 parts of shrimp shell powder (particle size ≤ 30 μm), stir evenly to obtain the initial mixture; then add 4 parts of binder and 4 parts of deionized water, stir evenly to obtain the final mixture;

[0066] (2) The mixture is left to stand for 2 hours, pressed into shape, and dried at 100°C for 24 hours to obtain the initial blank.

[0067] (3) The initial blank is heated from room temperature to 300℃ at a rate of 2℃ / min, then heated to 1000℃ at a rate of 4℃ / min, and then heated to 1300℃ at a rate of 6℃ / min. The temperature is held for 2 hours and then cooled to room temperature in the furnace to obtain a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material.

[0068] The high-content phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, including a room temperature compressive strength of 14.3 MPa, an apparent porosity of 65.2%, and a bulk density of 0.97 g / cm³. 3 Thermal conductivity 0.096 W / (m·K) (1000℃).

[0069] Example 4

[0070] (1) First, add 40 parts of phosphogypsum A (particle size ≤ 30 μm), 35 parts of phosphogypsum B (30 μm ≤ particle size ≤ 75 μm), 15 parts of fly ash (particle size ≤ 2 μm, 12 wt% ≥ C content ≥ 6 wt%), 6 parts of rice husk ash (particle size ≤ 2 μm) and 2 parts of shrimp shell powder (particle size ≤ 30 μm), stir evenly to obtain the initial mixture; then add 7 parts of binder and 8 parts of deionized water, stir evenly to obtain the final mixture;

[0071] (2) The mixture is left to stand for 3 hours, pressed into shape, and dried at 100°C for 24 hours to obtain the initial blank.

[0072] (3) The initial blank is heated from room temperature to 300℃ at a rate of 2℃ / min, then heated to 900℃ at a rate of 4℃ / min, and then heated to 1400℃ at a rate of 5℃ / min. The temperature is held for 3 hours and then cooled to room temperature in the furnace to obtain a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material.

[0073] The high-content phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, including a room temperature compressive strength of 10.03 MPa, an apparent porosity of 63.44%, and a bulk density of 0.99 g / cm³. 3Thermal conductivity 0.107 W / (m·K) (1000℃).

[0074] Example 5

[0075] (1) First, add 40 parts of phosphogypsum A (particle size ≤ 30 μm), 35 parts of phosphogypsum B (30 μm ≤ particle size ≤ 75 μm), 15 parts of fly ash (particle size ≤ 2 μm, 12 wt% ≥ C content ≥ 6 wt%), 5 parts of rice husk ash (particle size ≤ 2 μm) and 1 part of shrimp shell powder (particle size ≤ 30 μm), stir evenly to obtain the initial mixture; then add 9 parts of binder and 12 parts of deionized water, stir evenly to obtain the final mixture;

[0076] (2) The mixture is left to stand for 4 hours, pressed into shape, and dried at 100°C for 24 hours to obtain the initial blank.

[0077] (3) The initial blank is heated from room temperature to 300℃ at a rate of 2℃ / min, then heated to 1000℃ at a rate of 4℃ / min, and then heated to 1400℃ at a rate of 8℃ / min. The temperature is held for 4 hours and then cooled to room temperature in the furnace to obtain a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material.

[0078] The high-content phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, including a room temperature compressive strength of 7.07 MPa, an apparent porosity of 61.38%, and a bulk density of 1.04 g / cm³. 3 Thermal conductivity 0.126 W / (m·K) (1000℃).

[0079] Example 6

[0080] (1) First, add 45 parts of phosphogypsum A (particle size ≤ 30 μm), 30 parts of phosphogypsum B (30 μm ≤ particle size ≤ 75 μm), 16 parts of fly ash (particle size ≤ 2 μm, 12 wt% ≥ C content ≥ 6 wt%), and 2 parts of rice husk ash (particle size ≤ 2 μm), and stir evenly to obtain the initial mixture; then add 12 parts of binder and 15 parts of deionized water, and stir evenly to obtain the mixture;

[0081] (2) The mixture is left to stand for 5 hours, pressed into shape, and dried at 100°C for 24 hours to obtain the initial blank.

[0082] (3) The initial blank is heated from room temperature to 300℃ at a rate of 2℃ / min, then heated to 800℃ at a rate of 4℃ / min, and then heated to 1100℃ at a rate of 5℃ / min. The temperature is held for 5 hours and then cooled to room temperature in the furnace to obtain a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material.

[0083] The high-content phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, including a room temperature compressive strength of 5.38 MPa, an apparent porosity of 59.74%, and a bulk density of 1.21 g / cm³. 3 Thermal conductivity 0.133 W / (m·K) (1000℃).

[0084] Example 7

[0085] (1) First, add 45 parts of phosphogypsum A (particle size ≤ 30 μm), 30 parts of phosphogypsum B (30 μm ≤ particle size ≤ 75 μm), 16 parts of fly ash (particle size ≤ 2 μm, 12 wt% ≥ C content ≥ 6 wt%) and 1 part of rice husk ash (particle size ≤ 2 μm), stir evenly to obtain the initial mixture; then add 13 parts of binder and 15 parts of deionized water, stir evenly to obtain the mixture;

[0086] (2) The mixture is left to stand for 5 hours, pressed into shape, and dried at 90°C for 24 hours to obtain the initial blank.

[0087] (3) The initial blank is heated from room temperature to 300℃ at a rate of 2℃ / min, then heated to 950℃ at a rate of 5℃ / min, and then heated to 1300℃ at a rate of 6℃ / min. The temperature is held for 5 hours and then cooled to room temperature in the furnace to obtain a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material.

[0088] The high-content phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, including a room temperature compressive strength of 3.52 MPa, an apparent porosity of 58.83%, and a bulk density of 1.29 g / cm³. 3 Thermal conductivity 0.139 W / (m·K) (1000℃).

[0089] Example 8

[0090] (1) First, add 45 parts of phosphogypsum A (particle size ≤ 30 μm), 30 parts of phosphogypsum B (30 μm ≤ particle size ≤ 75 μm), 16 parts of fly ash (particle size ≤ 2 μm, 12 wt% ≥ C content ≥ 6 wt%) and 1 part of shrimp shell powder (particle size ≤ 30 μm), stir evenly to obtain the initial mixture; then add 13 parts of binder and 15 parts of deionized water, stir evenly to obtain the mixture;

[0091] (2) The mixture is left to stand for 5 hours, pressed into shape, and dried at 90°C for 24 hours to obtain the initial blank.

[0092] (3) The initial blank is heated from room temperature to 300℃ at a rate of 2℃ / min, then heated to 950℃ at a rate of 5℃ / min, and then heated to 1300℃ at a rate of 6℃ / min. The temperature is held for 5 hours and then cooled to room temperature in the furnace to obtain a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material.

[0093] The high-content phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, including a room temperature compressive strength of 2.36 MPa, an apparent porosity of 56.7%, and a bulk density of 1.32 g / cm³. 3 Thermal conductivity 0.142 W / (m·K) (1000℃).

[0094] As can be seen from the above embodiments, the present invention provides a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material and its preparation method. The preparation process of the present invention is simple; compression molding can improve the yield and reduce production losses, realizing the resource-based and full-scale utilization of phosphogypsum without generating secondary pollution. Furthermore, the prepared high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material has a bulk density as low as 0.97 g / cm³. 3 It has a compressive strength of 15.8 MPa and a thermal conductivity of 0.096 W / (m·K) at 1400℃. It maximizes the high-value and resource utilization of phosphogypsum, has a high temperature resistance of up to 1400℃, and has a wide range of applications.

[0095] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-content phosphogypsum-based super-insulating porous high-temperature resistant material, characterized in that, It is prepared from the following parts by weight of raw materials: Phosphogypsum A 30-45 parts; Phosphogypsum B 30-45 parts; 5-16 parts fly ash; 0-10 parts of rice husk ash; 0-5 parts shrimp shell powder; 0-13 parts of adhesive; 4-15 parts water; The particle size of phosphogypsum A is <30μm, and the particle size range of phosphogypsum B is 30~75μm; The contents of rice husk ash, shrimp shell powder, and binder are all 0.

2. The high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to claim 1, characterized in that, The fly ash has a particle size ≤75μm, and the C content in the fly ash is 6~12wt%, the Al2O3 content is 25~45wt%, and the SiO2 content is 40~60wt%.

3. The high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to claim 1 or 2, characterized in that, The CaSO4 content in phosphogypsum A and phosphogypsum B is 75~95wt%.

4. The high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to claim 3, characterized in that, The rice husk ash has a particle size ≤2μm and a SiO2 content ≥70wt%.

5. The high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to claim 1, 2, or 4, characterized in that, The binder is phosphogypsum that has been treated at 200°C.

6. The high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to claim 5, characterized in that, The particle size of the shrimp shell powder is ≤30μm.

7. The preparation method of the high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to any one of claims 1 to 6, characterized in that, Includes the following steps: (1) Mix phosphogypsum A, phosphogypsum B, fly ash, rice husk ash and shrimp shell powder to obtain an initial mixture; (2) The initial mixture, binder and water are mixed to obtain the mixture; (3) After the mixture is trapped, it is pressed into shape and dried to obtain the initial green body; (4) The initial green body is subjected to programmed heating and calcination to obtain a high-content phosphogypsum-based super-insulating porous high-temperature resistant material.

8. The preparation method of the high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to claim 7, characterized in that, The material is trapped for 0.5 to 5 hours, the pressing pressure is 5 to 8 MPa, the drying temperature is 60 to 110°C, and the drying time is 18 to 36 hours.

9. The preparation method of the high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to claim 7 or 8, characterized in that, The programmed heating and calcination process specifically includes: first heating the initial green body from 20-30℃ to 300℃ at a rate of 1-2℃ / min, then heating it from 300℃ to 800-1000℃ at a rate of 2-5℃ / min, and then heating it to 1100-1400℃ at a rate of 5-8℃ / min, and holding it at that temperature for 2-5 hours.

10. The preparation method of the high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to claim 9, characterized in that, In steps (1) and (2), the mixing is carried out under stirring until the mixture is homogeneous.

Images