High-content phosphogypsum-based super-adiabatic porous high-temperature-resistant material and preparation method thereof

Abstract

The invention provides a high-content ardealite-based super-adiabatic porous high-temperature-resistant material and a preparation method thereof, and belongs to the technical field of ardealite materials. According to the invention, solid wastes such as ardealite, fly ash, rice hull ash and shrimp shells are mixed to prepare the high-content ardealite-based super-adiabatic porous high-temperature-resistant material. According to the invention, high-value and high-efficiency resource utilization of solid wastes such as ardealite, fly ash and rice hull ash is realized. The heat conductivity coefficient of the obtained super-heat-insulation high-temperature-resistant material at 1000 DEG C is only 0.096 W / (m.K), the commercial value of the super-heat-insulation high-temperature-resistant material is as high as 9800 yuan / m < 3 >, and high-value utilization of solid waste is achieved to the maximum extent.

Description

Technical Field

[0001] The present invention relates to the technical field of phosphogypsum materials, and in particular to a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material and a preparation method thereof. Background Art

[0002] Phosphogypsum is the main by-product in the production of wet-process phosphoric acid. For every ton of phosphoric acid produced, 4-5 tons of phosphogypsum are usually produced. With the rapid development of the phosphate fertilizer and phosphorus chemical industries, the annual output of phosphogypsum in the world has increased year by year, especially in China, where the annual production of phosphogypsum has exceeded 100 million tons, and the stockpile volume has increased year by year. This not only occupies a large amount of land resources, but also brings serious environmental problems. Phosphogypsum contains a small amount of impurities such as soluble phosphorus, fluoride and heavy metals. If it is stored for a long time, it will not only pollute the soil and water sources, but also may cause dust pollution and potential radioactive threats. Therefore, how to efficiently treat and utilize phosphogypsum has become a topic that needs to be urgently solved in the current field of environmental protection and resource utilization.

[0003] Although the main component of phosphogypsum is calcium sulfate dihydrate (CaSO4·2H2O), it theoretically has a high utilization potential. However, in practical applications, due to its high impurity content and unstable properties, its use in building materials, soil conditioners and other fields is not high, and its large-scale utilization is limited. In addition, the large-scale utilization of phosphogypsum also faces the technical difficulty of impurity removal. Therefore, promoting the research on the high value and large-scale utilization of phosphogypsum is not only of great significance to the recycling of resources, but also can effectively alleviate the ecological and environmental threats caused by its storage.

[0004] In recent years, the comprehensive utilization of phosphogypsum has received extensive attention at home and abroad, among which the use of it to produce building materials such as lightweight wallboards, insulation boards, and cementitious materials has gradually become a research hotspot. However, due to the presence of impurities in phosphogypsum, these applications often require complex pretreatment processes, which increases production costs. At the same time, in the chemical industry, research on the use of phosphogypsum to co-produce sulfuric acid and other high-value-added products has also gradually emerged, which provides new possibilities for the resource utilization of phosphogypsum.

[0005] A phosphogypsum-coal gangue-based lightweight heat-insulating and high-temperature-resistant material and a preparation method thereof CN116621562B provides a phosphogypsum-coal gangue lightweight heat-insulating and high-temperature-resistant material and a preparation method thereof. The invention utilizes all solid waste as raw materials to prepare a lightweight heat-insulating and high-temperature-resistant material and a preparation method thereof, thereby realizing the high-value utilization of bulk solid waste. The problem of resource utilization of phosphogypsum is the most difficult problem among all solid wastes, and it is related to the economic crisis of major phosphorus chemical companies and the environmental governance of the middle and lower reaches of the Yangtze River. However, the amount of phosphogypsum doped in the high-temperature resistant materials of the prior art is small, and the effect of realizing its large-scale utilization is relatively small; at the same time, during high-temperature calcination, the exhaust gas generated by the calcination is not collected for secondary recycling, which wastes 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 at present. Summary of the invention

[0007] The object of the present invention is to provide a high-doped phosphogypsum-based super-insulating porous high-temperature resistant material and a preparation method thereof, which are used to solve the technical problem that a large amount of solid waste such as phosphogypsum cannot be efficiently utilized as a resource.

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

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

[0010]

[0011] The particle size of the phosphogypsum A is less than 30 μm, and the particle size of the phosphogypsum B is in the range of 30 to 75 μm;

[0012] The contents of the rice husk ash, shrimp shell powder and binder are not all 0 at the same time.

[0013] Furthermore, the particle size of the fly ash is ≤75 μm, the C content in the fly ash is 6-12wt%, the Al2O3 content is 25-45wt%, and the SiO2 content is 40-60wt%.

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

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

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

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

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

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

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

[0021] (3) pressing the mixed material into a shape and drying it to obtain an initial green body;

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

[0023] Furthermore, the material trapping time is 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.

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

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

[0026] Beneficial effects of the present invention:

[0027] (1) The present invention has a high dosage of phosphogypsum, 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 that has not been completely decomposed in the accumulation state will stop decomposing because it is wrapped by the liquid phase that appears prematurely in the raw material, thereby reducing the quality of cement. The present invention takes advantage of this defect and proposes a novel treatment scheme. The produced super-insulating porous high-temperature resistant material fully utilizes the impurity burnout and the generation of liquid phase to achieve the purpose of in-situ pore formation. Through thermogravimetric experimental analysis, it is found that the preparation of porous materials will not prevent the further decomposition of phosphogypsum. On the one hand, due to the generation of liquid phase, some impurities, including arsenic, selenium and other elements, will migrate to 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 materials, and arsenic, selenium and other elements 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. The carbon and other elements contained in fly ash have a reducing and decomposing 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-doped phosphogypsum super-insulating high-temperature resistant material proposed in the present invention is far higher than that of the cement industry. The present invention studies the super-insulating high-temperature resistant material, the thermal conductivity of which is only 0.096 W / (m·K) at 1000°C, and its commercial value is as high as 9800 yuan / m 3 , achieving the high-value utilization of solid waste to the greatest extent. DETAILED DESCRIPTION

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

[0031]

[0032] The particle size of the phosphogypsum A is less than 30 μm, and the particle size of the phosphogypsum B is in the range of 30 to 75 μm;

[0033] The contents of the rice husk ash, shrimp shell powder and binder are not all 0 at the same time.

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

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

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

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

[0038] In the present invention, the content of the binder is preferably 3 to 9 parts by mass, and more preferably 4 to 7 parts by mass.

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

[0040] In the present 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%; the SiO2 content is 40-60wt%, preferably 45-55wt%.

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

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

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

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

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

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

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

[0048] (3) pressing the mixed material into a shape and drying it to obtain an initial green body;

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

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

[0051] In the present invention, the programmed temperature calcination specifically comprises: heating the initial green body from 20 to 30 ° C to 300 ° C at a rate of 1 to 2 ° C / min, heating from 300 ° C to 800 to 1000 ° C at a rate of 2 to 5 ° C / min, and then heating to 1100 to 1400 ° C at a rate of 5 to 8 ° C / min, and keeping warm for 2 to 5 hours; preferably, the initial green body is first heated from 25 ° C to 300 ° C at a rate of 1 ° C / min, heated from 300 ° C to 900 ° C at a rate of 3 ° C / min, and then heated to 1200 ° C at a rate of 8 ° C / min, and kept warm for 4 hours.

[0052] In the present invention, in step (1) and step (2), the mixing is carried out under stirring until the mixture is uniform.

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

[0054] Example 1

[0055] (1) firstly 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 an initial mixture; then add 4 parts of deionized water, stir evenly to obtain a mixture;

[0056] (2) trapping the mixture for 2 hours, pressing and molding, and drying at 110° C. for 24 hours to obtain an initial green body;

[0057] (3) The initial green body is first heated from room temperature to 300°C at a rate of 1°C / min, then heated to 800°C at a rate of 2°C / min, and then heated to 1100°C at a rate of 5°C / min, kept warm for 2 hours, and furnace cooled to room temperature to obtain a high-doped phosphogypsum-based super-insulating porous high-temperature resistant material.

[0058] The high-doped phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, among which the room temperature compressive strength was 8.74 MPa; the apparent porosity was 57.2%; the volume density was 1.17 g / cm 3 ; Thermal conductivity 0.26W / (m·K) (1000℃).

[0059] Example 2

[0060] (1) firstly 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 an initial mixture; then add 3 parts of a binder and 4 parts of deionized water, stir evenly to obtain a mixture;

[0061] (2) trapping the mixture for 2 hours, pressing and molding, and drying at 110° C. for 24 hours to obtain an initial green body;

[0062] (3) The initial green body is first heated from room temperature to 300°C at a rate of 1°C / min, then heated to 900°C at a rate of 3°C / min, and then heated to 1200°C at a rate of 6°C / min, kept warm for 2 hours, and furnace cooled to room temperature to obtain a high-doped phosphogypsum-based super-insulating porous high-temperature resistant material.

[0063] The high-doped phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, among which the room temperature compressive strength was 9.27 MPa; the apparent porosity was 60.17%; the volume density was 1.07 g / cm 3 ; Thermal conductivity 0.11W / (m·K) (1000℃).

[0064] Example 3

[0065] (1) firstly 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 an initial mixture; then add 4 parts of a binder and 4 parts of deionized water, stir evenly to obtain a mixture;

[0066] (2) The mixed material is trapped for 2 hours, pressed into a shape, and dried at 100° C. for 24 hours to obtain an initial green body;

[0067] (3) The initial green body is first heated from room temperature to 300°C at a rate of 2°C / min, then heated to 1000°C at a rate of 4°C / min, and then heated to 1300°C at a rate of 6°C / min, kept warm for 2 hours, and furnace cooled to room temperature to obtain a high-doped phosphogypsum-based super-insulating porous high-temperature resistant material.

[0068] The high-doped phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, among which the room temperature compressive strength was 14.3 MPa; the apparent porosity was 65.2%; the volume density was 0.97 g / cm 3 ; Thermal conductivity 0.096W / (m·K) (1000℃).

[0069] Example 4

[0070] (1) firstly 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 an initial mixture; then add 7 parts of a binder and 8 parts of deionized water, stir evenly to obtain a mixture;

[0071] (2) trapping the mixture for 3 hours, pressing and molding, and drying at 100° C. for 24 hours to obtain an initial green body;

[0072] (3) The initial green body is first heated from room temperature to 300°C at a rate of 2°C / min, then heated to 900°C at a rate of 4°C / min, and then heated to 1400°C at a rate of 5°C / min, kept warm for 3 hours, and furnace cooled to room temperature to obtain a high-doped phosphogypsum-based super-insulating porous high-temperature resistant material.

[0073] The high-doped phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, among which the room temperature compressive strength was 10.03MPa; the apparent porosity was 63.44%; the volume density was 0.99g / cm 3; Thermal conductivity 0.107W / (m·K) (1000℃).

[0074] Example 5

[0075] (1) firstly 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 an initial mixture; then add 9 parts of a binder and 12 parts of deionized water, stir evenly to obtain a mixture;

[0076] (2) The mixed material is trapped for 4 hours, pressed into a shape, and dried at 100° C. for 24 hours to obtain an initial green body;

[0077] (3) The initial green body is first heated from room temperature to 300°C at a rate of 2°C / min, then heated to 1000°C at a rate of 4°C / min, and then heated to 1400°C at a rate of 8°C / min, kept warm for 4 hours, and furnace cooled to room temperature to obtain a high-doped phosphogypsum-based super-insulating porous high-temperature resistant material.

[0078] The high-doped phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, among which the room temperature compressive strength was 7.07 MPa; the apparent porosity was 61.38%; the volume density was 1.04 g / cm 3 ; Thermal conductivity 0.126W / (m·K) (1000℃).

[0079] Example 6

[0080] (1) firstly 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 an initial mixture; then add 12 parts of a binder and 15 parts of deionized water, and stir evenly to obtain a mixture;

[0081] (2) The mixed material is trapped for 5 hours, pressed into a shape, and dried at 100° C. for 24 hours to obtain an initial green body;

[0082] (3) The initial green body was first heated from room temperature to 300°C at a rate of 2°C / min, then heated to 800°C at a rate of 4°C / min, and then heated to 1100°C at a rate of 5°C / min, kept warm for 5 hours, and furnace cooled to room temperature to obtain a high-doped phosphogypsum-based super-insulating porous high-temperature resistant material.

[0083] The high-doped phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, among which the room temperature compressive strength was 5.38MPa; the apparent porosity was 59.74%; the volume density was 1.21g / cm 3 ; Thermal conductivity 0.133W / (m·K) (1000℃).

[0084] Example 7

[0085] (1) firstly 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 an initial mixture; then add 13 parts of a binder and 15 parts of deionized water, stir evenly to obtain a mixture;

[0086] (2) the mixture is trapped for 5 hours, pressed into shape, and dried at 90° C. for 24 hours to obtain an initial green body;

[0087] (3) The initial green body was first heated from room temperature to 300°C at a rate of 2°C / min, then heated to 950°C at a rate of 5°C / min, and then heated to 1300°C at a rate of 6°C / min, kept warm for 5 hours, and then cooled to room temperature to obtain a high-doped phosphogypsum-based super-insulating porous high-temperature resistant material.

[0088] The high-doped phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, among which the room temperature compressive strength was 3.52MPa; the apparent porosity was 58.83%; the volume density was 1.29g / cm 3 ; Thermal conductivity 0.139W / (m·K) (1000℃).

[0089] Example 8

[0090] (1) firstly 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 an initial mixture; then add 13 parts of a binder and 15 parts of deionized water, stir evenly to obtain a mixture;

[0091] (2) the mixture is trapped for 5 hours, pressed into shape, and dried at 90° C. for 24 hours to obtain an initial green body;

[0092] (3) The initial green body was first heated from room temperature to 300°C at a rate of 2°C / min, then heated to 950°C at a rate of 5°C / min, and then heated to 1300°C at a rate of 6°C / min, kept warm for 5 hours, and then cooled to room temperature to obtain a high-doped phosphogypsum-based super-insulating porous high-temperature resistant material.

[0093] The high-doped phosphogypsum-based super-insulating porous high-temperature resistant material prepared in this embodiment was subjected to various performance tests, among which the room temperature compressive strength was 2.36MPa; the apparent porosity was 56.7%; the volume density was 1.32g / cm 3 ; Thermal conductivity 0.142W / (m·K) (1000℃).

[0094] It can be seen from the above embodiments that the present invention provides a high-doped phosphogypsum-based super-insulating porous high-temperature resistant material and a preparation method thereof. The preparation process of the present invention is simple, and the compression molding can improve the yield rate and reduce production losses, thereby realizing the resource and full-quantity utilization of phosphogypsum without generating secondary pollution; and the prepared high-doped phosphogypsum-based super-insulating porous high-temperature resistant material has a volume density as low as 0.97 g / cm 3 The compressive strength reaches 15.8MPa and the thermal conductivity is 0.096W / (m·K) at 1400℃. It realizes the high value and resource utilization of phosphogypsum to the greatest extent. The high temperature resistance can reach 1400℃ and has a wide range of applications.

[0095] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high-doped phosphogypsum-based super-insulating porous high-temperature resistant material, characterized in that: Prepared from the following raw materials in parts by weight: The particle size of the phosphogypsum A is less than 30 μm, and the particle size of the phosphogypsum B is in the range of 30 to 75 μm; The contents of the rice husk ash, shrimp shell powder and binder are not all 0 at the same time.

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

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 the phosphogypsum A and the 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 particle size of the rice husk ash is ≤2 μm, and the content of SiO2 in the rice husk ash is ≥70 wt%.

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 treated at a high temperature of 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 ≤30 μm.

7. The method for preparing a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) mixing phosphogypsum A, phosphogypsum B, fly ash, rice husk ash and shrimp shell powder to obtain an initial mixture; (2) mixing the initial mixture, the binder and water to obtain a mixture; (3) pressing the mixed material into a shape and drying it to obtain an initial green body; (4) The initial green body is subjected to programmed temperature calcination to obtain a high-doped phosphogypsum-based ultra-insulating porous high-temperature resistant material.

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

9. The method for preparing a high-dosage phosphogypsum-based super-insulating porous high-temperature resistant material according to claim 7 or 8, characterized in that: The programmed temperature calcination specifically comprises: heating the initial green body from 20-30°C to 300°C at a rate of 1-2°C / min, heating from 300°C to 800-1000°C at a rate of 2-5°C / min, and then heating to 1100-1400°C at a rate of 5-8°C / min, and keeping the temperature for 2-5h.

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

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