Process for preparing foaming material from waste incineration fly ash

Abstract

The invention relates to the technical field of mortar forming treatment, and provides a process for preparing a foaming material by utilizing waste incineration fly ash, which comprises the following steps: S1, pyrolysis treatment: performing pyrolysis treatment on the waste incineration fly ash under an anaerobic condition and in an environment of 450-800 DEG C; s2, washing dechlorination treatment: carrying out washing dechlorination treatment on the waste incineration fly ash obtained in the step S1; s3, preparing slurry: mixing the waste incineration fly ash obtained in the step S2 with a basic material and an auxiliary foaming agent, and performing wet milling by using a ball mill to prepare the slurry; s4, granulation: performing spray granulation on the slurry to obtain powder particles; s5, firing: filling a mold with the powder particles obtained in the step S4, and performing calcination treatment in an air atmosphere to obtain a semi-finished product of the foaming material; and S6, cutting and forming are conducted, specifically, the semi-finished foaming material is cut to obtain a finished foaming material, and by means of the technology, the resource utilization efficiency of the waste incineration fly ash is greatly improved.

Description

Technical Field

[0001] This application relates to the field of mortar molding and processing technology, and more specifically, to a process for preparing foamed materials using fly ash from waste incineration. Background Technology

[0002] Municipal solid waste incineration for power generation has become a new solution to the problem of urban waste accumulation. Data shows that after incineration, the volume of municipal solid waste can be reduced by more than 90%, and its weight by more than 80%. Of the solid waste generated, slag accounts for about 15-17%, and fly ash accounts for about 3-5%, demonstrating a significant reduction in volume and making it one of the most suitable methods for treating municipal solid waste. However, there are always two sides to every coin. While municipal solid waste incineration projects have played a positive role in waste reduction, the fly ash produced has become a new challenge for environmental protection in some cities. Improper management and disposal of fly ash from municipal solid waste incineration will cause secondary environmental pollution and health impacts. It is noteworthy that some areas are already experiencing problems with the illegal disposal of fly ash. Some places have not followed the national requirements for zoned landfilling of fly ash, instead storing it together with municipal solid waste. Some places have not taken standardized measures to prevent dust, rain, and seepage (leakage) when storing fly ash. Some places have also illegally piled up fly ash indiscriminately under the guise of temporary storage, all of which pose serious environmental risks. Therefore, the scientific and economical disposal of fly ash is an urgent need for ecological environmental protection and urban construction management! Municipal solid waste incineration fly ash refers to the ash collected by the flue gas purification system of municipal solid waste incineration facilities, as well as the bottom ash settling at the bottom of the flue and chimney. The particle size of fly ash generally ranges from 0.3 to 300 μm, with a high specific surface area and strong activity. It contains a large amount of soluble chloride salts and is enriched with large amounts of toxic heavy metals such as Zn, Pb, Cu, Cr, Ni, Mn, As, Cd, Co, Ag, and Hg. It is also enriched with large amounts of dioxins, making it a dual hazardous waste possessing both heavy metal hazard characteristics and persistent organic toxicity hazards, posing a significant threat to human health and the ecological environment. Overall, current technologies have not effectively achieved the harmless treatment and resource utilization of municipal solid waste incineration fly ash. Summary of the Invention

[0003] In view of this, this application provides a process for preparing foamed materials using fly ash from municipal solid waste incineration, in order to solve the technical problem in the prior art that fly ash from municipal solid waste incineration is not effectively treated for harmlessness and utilized for resource recovery.

[0004] This application provides a process for preparing foamed materials using waste incineration fly ash, wherein the process for preparing foamed materials using waste incineration fly ash includes the following steps: S1. Pyrolysis treatment: The fly ash from waste incineration is pyrolyzed under anaerobic conditions in an environment of 450°C to 800°C to decompose the dioxins in the fly ash. S2, Water washing and dechlorination treatment: The pyrolysis fly ash obtained in step S1 is subjected to water washing and dechlorination treatment to obtain purified fly ash. S3. Making slurry: Mix the purified waste incineration fly ash obtained in step S2 with the base materials and auxiliary foaming agent, and wet grind it into slurry using a ball mill. S4. Granulation: The above slurry is spray-granulated to obtain powder particles; S5. Firing: The powder particles obtained in step S4 are filled into the mold and calcined in air atmosphere at a sintering temperature of 1100℃ to 1250℃ to obtain a semi-finished foamed material. S6. Cutting and shaping: Cut the semi-finished foamed material to obtain the finished foamed material.

[0005] Further, in step S1, the waste incineration fly ash undergoes pyrolysis treatment in a pyrolysis device, the pyrolysis device comprising: A drive motor and a rotary mixing chamber connected to the output shaft of the drive motor. The rotary mixing chamber includes a circular base plate and an annular side plate connected to the side edge of the circular base plate. The circular base plate is arranged coaxially with the output shaft of the drive motor. The circular base plate has a nitrogen inlet hole. The annular side plate and the circular base plate form a total mixing cavity. The annular side plate forms an opening of the total mixing cavity on the side opposite to the circular base plate. A first sealing structure and a second sealing structure. The first sealing structure has a nitrogen inlet transfer chamber connected to a nitrogen supply source. The second sealing structure has a fly ash inlet transfer chamber and a fly ash outlet transfer chamber. The nitrogen inlet transfer chamber can communicate with the mixing chamber through a nitrogen inlet hole. Both the fly ash inlet transfer chamber and the fly ash outlet transfer chamber can communicate with the mixing chamber through an opening in the mixing chamber.

[0006] Further, the first sealing structure includes a first sealing plate, the nitrogen inlet transfer chamber is disposed on the first sealing plate, the nitrogen inlet transfer chamber is provided with a nitrogen inlet pipe, the nitrogen inlet transfer chamber is connected to the nitrogen supply source through the nitrogen inlet pipe, the first sealing plate has a first through hole communicating with the nitrogen inlet transfer chamber, the rotating mixing chamber is located at one end of the circular base plate and is rotatably sealed to the first sealing plate, and the first sealing plate is sealed to the circular base plate, the rotating mixing chamber can rotate to a position where the first through hole communicates with the nitrogen inlet hole; the first... The dual-end structure includes a second sealing plate. The fly ash input transfer chamber and the fly ash output transfer chamber are disposed on the second sealing plate. The second sealing plate seals the opening of the mixing chamber. The fly ash input transfer chamber is provided with a fly ash input pipe and a first valve. The fly ash output transfer chamber is provided with a fly ash output pipe and a second valve. The second sealing plate has a second through hole and a third through hole. The mixing chamber is connected to the fly ash input transfer chamber through the second through hole, and the mixing chamber is connected to the fly ash output transfer chamber through the third through hole.

[0007] Furthermore, the mixing chamber is provided with multiple partitions, which divide the mixing chamber into multiple mixing unit chambers arranged sequentially at intervals along the circumference of the circular base plate. The circular base plate is provided with multiple nitrogen inlet holes at positions corresponding to each mixing unit chamber. The rotating mixing chamber can be rotated to a position where the first through hole is connected to all the nitrogen inlet holes corresponding to the same mixing unit chamber.

[0008] Furthermore, the second and third through holes are aligned with and connected to different mixing unit cavities, respectively.

[0009] Furthermore, the outer edge of the first sealing plate forms a first sealing edge, and the outer edge of the second sealing plate forms a second sealing edge. Both the first sealing edge and the second sealing edge are sealed to the outer side of the annular side plate.

[0010] Furthermore, a first sealing bearing is provided between the first sealing edge and the outer side of the annular side plate, and a second sealing bearing is provided between the second sealing edge and the outer side of the annular side plate.

[0011] Furthermore, a nitrogen heating chamber is provided between the nitrogen inlet transfer chamber and the nitrogen supply source.

[0012] Further, the water washing dechlorination treatment in step S2 includes: mixing the pyrolyzed fly ash obtained from the pyrolysis of the waste incineration fly ash obtained in step S1 with the washing liquid at a solid-liquid ratio of 1:4 to 1:8, mechanically stirring and washing at 30°C to 60°C for 30 to 60 minutes, and then separating the solid and liquid after washing to obtain the water-washed fly ash and chlorine-containing wastewater, wherein the washing liquid is deionized water or a dilute nitric acid or dilute acetic acid solution with a pH value adjusted to 3 to 5.

[0013] Furthermore, the auxiliary foaming agent includes one or more of silicon carbide, calcium carbonate, and silicon dioxide, and the base material includes clay, lithium tailings, feldspar, hydroxyl salts, and polyacrylates.

[0014] The beneficial effects of the process for preparing foamed materials using fly ash from waste incineration provided by this invention are as follows: Compared to existing technologies, the process for preparing foamed materials using waste incineration fly ash provided in this application, through pyrolysis treatment, water washing and dechlorination treatment, slurry preparation, granulation, firing and cutting molding steps, can remove harmful substances such as dioxins and chlorine from waste incineration fly ash. In particular, it can produce finished foamed materials such as foamed ceramics from waste incineration fly ash. Foamed ceramics can be widely used in housing construction, interior decoration and other scenarios. It can not only effectively treat the fly ash from municipal solid waste incineration, but also greatly improve the resource utilization efficiency of waste incineration fly ash. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a simplified flowchart of a process for preparing foamed materials using fly ash from waste incineration, according to an embodiment of this application. Figure 2 This is a three-dimensional schematic diagram of the pyrolysis equipment used in a process for preparing foamed materials from waste incineration fly ash according to an embodiment of this application; Figure 3 This is another perspective schematic diagram of the pyrolysis equipment used in the process of preparing foamed materials from waste incineration fly ash according to an embodiment of this application; Figure 4 This is a three-dimensional schematic diagram of a portion of the structure of the pyrolysis equipment used in the process of preparing foamed materials from waste incineration fly ash according to an embodiment of this application. Figure 5This is another three-dimensional schematic diagram of a portion of the structure of the pyrolysis equipment used in the process of preparing foamed materials from waste incineration fly ash according to an embodiment of this application; Figure 6 This is a three-dimensional schematic diagram of the rotary mixing chamber in the pyrolysis equipment used in the process of preparing foamed materials from waste incineration fly ash according to an embodiment of this application; Figure 7 This is another perspective view of the rotary mixing chamber in the pyrolysis equipment used in the process of preparing foamed materials from waste incineration fly ash according to an embodiment of this application; Figure 8 This is a three-dimensional schematic diagram of the first sealing plate in the pyrolysis equipment used in the process of preparing foamed materials from waste incineration fly ash according to an embodiment of this application; Figure 9 This is another perspective view of the first sealing plate in the pyrolysis equipment used in the process of preparing foamed materials from waste incineration fly ash according to an embodiment of this application; Figure 10 This is a three-dimensional schematic diagram of the second sealing plate in the pyrolysis equipment used in the process of preparing foamed materials from waste incineration fly ash according to an embodiment of this application; Figure 11 This is another perspective view of the second sealing plate in the pyrolysis equipment used in the process of preparing foamed materials from waste incineration fly ash according to an embodiment of this application; Figure 12 This is a schematic diagram of the assembly of some structures in the pyrolysis equipment used in the process of preparing foamed materials from waste incineration fly ash according to an embodiment of this application.

[0017] Explanation of reference numerals in the attached figures: 1-Drive motor; 2-Nitrogen inlet transfer chamber; 3-Fly ash inlet transfer chamber; 4-Fly ash outlet transfer chamber; 5-Nitrogen inlet pipe; 6-Fly ash inlet pipe; 7-Fly ash outlet pipe; 8-First valve; 9-Second valve; 10-Third valve; 11-First sealed bearing; 12-Second sealed bearing; 13-Nitrogen heating chamber; 14-Output shaft; 100-Rotating mixing chamber; 101-Circular base plate; 102-Annular side plate; 103-Nitrogen inlet hole; 104-Partition plate; 105-Mixing unit chamber; 106-Mixing main chamber; 200-First sealing plate; 201-First through hole; 202-First sealing edge; 300-Second sealing plate; 301-Second through hole; 302-Third through hole; 303-Second sealing edge. Detailed Implementation

[0018] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. One or more embodiments of this application are exemplarily shown in the drawings to provide a more accurate and thorough understanding of the technical solutions disclosed herein. However, it should be understood that this application can be implemented in many different forms and is not limited to the embodiments described below.

[0019] In the accompanying drawings of this application, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0021] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0022] See Figure 1 This application provides a process for preparing foamed materials using waste incineration fly ash, wherein the process for preparing foamed materials using waste incineration fly ash includes the following steps: S1. Pyrolysis treatment: The fly ash from waste incineration is pyrolyzed under anaerobic conditions in an environment of 450°C to 800°C to decompose the dioxins in the fly ash. S2, Water washing and dechlorination treatment: The pyrolysis fly ash obtained in step S1 is subjected to water washing and dechlorination treatment to obtain purified fly ash. S3. Making slurry: The purified waste incineration fly ash obtained in step S2 is mixed with the base materials and auxiliary foaming agent, and then wet-milled using a ball mill to make slurry (mixed waste ash slurry). S4. Granulation: The above slurry is spray-granulated to obtain powder particles; S5. Firing: The powder particles obtained in step S4 are filled into the mold and calcined in air atmosphere at a sintering temperature of 1100℃ to 1250℃ to obtain a semi-finished foamed material. S5. Cutting and shaping: Cut the semi-finished foamed material to obtain the finished foamed material, especially foamed ceramics. Foamed ceramics have the following advantages: light weight, high strength, good sound insulation, good waterproof and moisture-proof performance, not easy to crack, no need for plastering, high weather resistance, energy saving and environmental protection, and can be used as A1-level fireproof material. Foamed ceramics can be widely used in housing construction, interior decoration and other scenarios.

[0023] The process for preparing foamed materials from waste incineration fly ash provided in this application involves pyrolysis, water washing for dechlorination, slurry preparation, granulation, firing, and cutting. This process can remove harmful substances such as dioxins and chlorine from waste incineration fly ash. In particular, it can produce finished foamed materials such as foamed ceramics from waste incineration fly ash. Foamed ceramics can be widely used in building construction, interior decoration, and other applications. This process not only effectively treats waste incineration fly ash but also greatly improves the resource utilization efficiency of waste incineration fly ash.

[0024] According to a preferred embodiment of this application, the dechlorination treatment in step S2 includes: mixing the pyrolyzed fly ash obtained from the pyrolysis of waste incineration fly ash in step S1 with a washing liquid at a solid-liquid ratio of 1:4 to 1:8, mechanically stirring and washing at 30°C to 60°C for 30 to 60 minutes, followed by solid-liquid separation to obtain washed fly ash and chlorine-containing wastewater, wherein the washing liquid is deionized water or a dilute nitric acid or dilute acetic acid solution with a pH adjusted to 3 to 5. Alternatively, other known dechlorination treatment technologies can also be used.

[0025] According to a preferred embodiment of this application, in the slurry preparation step, the auxiliary foaming agent includes one or more of silicon carbide, calcium carbonate, and silicon dioxide, and the base materials include clay, lithium tailings, feldspar, rare earth materials, hydroxy acid salts, and polyacrylates. The ratio of fly ash to the raw materials composed of clay, lithium tailings, feldspar, hydroxy acid salts, polyacrylates, and auxiliary foaming agent can be as follows: fly ash, 15-30 parts; clay, 20-30 parts; lithium tailings, 30-40 parts; feldspar, 20-30 parts; hydroxy acid salts, 1-2 parts; polyacrylates, 1-2 parts; auxiliary foaming agent, 0.5-1 part. It is understood that the above-mentioned components and ratios of raw materials are merely examples, and this application is not limited to the above-mentioned components and ratios of raw materials. The components of the above-mentioned raw materials can be changed and the corresponding ratios can be redesigned according to actual needs.

[0026] See Figures 2 to 12 According to one embodiment of this application, in step S1, the fly ash from waste incineration undergoes pyrolysis treatment in a pyrolysis device, which includes: The drive motor 1 and the rotary mixing chamber 100 connected to the output shaft 14 of the drive motor 1. The rotary mixing chamber 100 includes a circular base plate 101 and an annular side plate 102 connected to the side edge of the circular base plate 101. The circular base plate 101 is arranged coaxially with the output shaft 14 of the drive motor 1. The circular base plate 101 has a nitrogen inlet hole 103. The annular side plate 102 and the circular base plate 101 form a mixing cavity 106. The annular side plate 102 forms an opening of the mixing cavity 106 on the side away from the circular base plate 101. The first sealing structure has a nitrogen inlet transfer chamber 2, which is connected to a nitrogen supply source. The second sealing structure has a fly ash inlet transfer chamber 3 and a fly ash outlet transfer chamber 4. The nitrogen inlet transfer chamber 2 can be connected to the mixing chamber 106 through a nitrogen inlet hole 103. Both the fly ash inlet transfer chamber 3 and the fly ash outlet transfer chamber 4 can be connected to the mixing chamber 106 through openings in the mixing chamber 106. In specific operation... Nitrogen gas can be heated to 450°C to 800°C and introduced into the mixing chamber 106 to create an environment of 450°C to 800°C. Waste incineration fly ash enters the mixing chamber 106 through the fly ash input transfer chamber 3, and the drive motor 1 is started to drive the rotating mixing chamber 100 to rotate, so as to fully mix with the nitrogen gas at 450°C to 800°C. Finally, the waste incineration fly ash after pyrolysis (dioxin removal) is output through the fly ash output transfer chamber 4 and arrives at the water washing and dechlorination treatment process.

[0027] According to a specific embodiment of this application, the first sealing structure includes a first sealing plate 200, a nitrogen inlet transfer chamber 2 is disposed on the first sealing plate 200, a nitrogen inlet pipe 5 is disposed on the nitrogen inlet transfer chamber 2, a third valve 10 can be disposed on the nitrogen inlet pipe 5, the nitrogen inlet transfer chamber 2 is connected to a nitrogen supply source through the nitrogen inlet pipe 5, the first sealing plate 200 has a first through hole 201 communicating with the nitrogen inlet transfer chamber 2, a rotating mixing chamber 100 is located at one end of a circular base plate 101 and is rotatably sealed to the first sealing plate 200, and the first sealing plate 200 is sealed to the circular base plate 101, the rotating mixing chamber 100 can be rotated to make the first through hole 201 communicate with the nitrogen inlet hole 10 3. The second sealing structure includes a second sealing plate 300, a fly ash input transfer chamber 3 and a fly ash output transfer chamber 4 are disposed on the second sealing plate 300, the second sealing plate 300 sealably covers the opening of the mixing chamber 106, a fly ash input pipe 6 is disposed on the fly ash input transfer chamber 3, a first valve 8 is disposed on the fly ash input pipe 6, a fly ash output pipe 7 is disposed on the fly ash output transfer chamber 4, a second valve 9 is disposed on the fly ash output pipe 7, the second sealing plate 300 has a second through hole 301 and a third through hole 302, the mixing chamber 106 is connected to the fly ash input transfer chamber 3 through the second through hole 301, and the mixing chamber 106 is connected to the fly ash output transfer chamber 4 through the third through hole 302.

[0028] According to a preferred embodiment of this application, the rotary mixing chamber 100 includes multiple partitions 104 disposed within the main mixing chamber 106. The partitions 104 divide the main mixing chamber 106 into multiple mixing unit chambers 105 arranged sequentially at intervals along the circumference of a circular base plate 101. The circular base plate 101 is provided with multiple nitrogen inlet holes 103 at positions corresponding to each mixing unit chamber 105. The rotary mixing chamber 100 can rotate to a position where the first through hole 201 is connected to all nitrogen inlet holes 103 corresponding to the same mixing unit chamber 105. In this way, the waste incineration fly ash and... Nitrogen gas at 450℃ to 800℃ can be fully mixed in each independent mixing unit chamber 105. Multiple nitrogen gas inlet holes 103 are directly injected into multiple points of the waste incineration fly ash entering the mixing unit chamber 105, so that the waste incineration fly ash is heated quickly and evenly. During the heating and mixing process, the second valve 9 is kept closed. After the rotating mixing chamber 100 is rotated to fill each mixing unit chamber 105 with nitrogen gas and waste incineration fly ash, the first valve 8 and the third valve 10 are closed. After heating for the required time, the second valve 9 is opened, and the pyrolyzed waste incineration fly ash is output through the fly ash output pipe 7.

[0029] According to a specific embodiment of this application, the second through hole 301 and the third through hole 302 are respectively aligned with and connected to different mixing unit cavities 105.

[0030] According to one embodiment of this application, the outer edge of the first sealing plate 200 forms a first sealing edge 202, and the outer edge of the second sealing plate 300 forms a second sealing edge 303. Both the first sealing edge 202 and the second sealing edge 303 are sealed to the outer side of the annular side plate 102.

[0031] According to one embodiment of this application, a first sealing bearing 11 is provided between the first sealing edge 202 and the outer side of the annular side plate 102, and a second sealing bearing 12 is provided between the second sealing edge 303 and the outer side of the annular side plate 102.

[0032] According to one embodiment of this application, a nitrogen heating chamber 13 is provided between the nitrogen inlet transfer chamber 2 and the nitrogen supply source. The nitrogen heating chamber 13 heats the nitrogen inside to 450°C to 800°C or even higher than 800°C, and then the nitrogen is transported to the nitrogen inlet transfer chamber 2.

[0033] It should be noted that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting this application. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of this application, such as combining different features in various embodiments, and these should all fall within the protection scope of this application.

Claims

1. A process for preparing foamed materials using fly ash from waste incineration, characterized in that, The process for preparing foamed materials using fly ash from waste incineration includes the following steps: S1. Pyrolysis treatment: The fly ash from waste incineration is pyrolyzed under anaerobic conditions in an environment of 450°C to 800°C to decompose the dioxins in the fly ash. S2, Water washing and dechlorination treatment: The pyrolysis fly ash obtained in step S1 is subjected to water washing and dechlorination treatment to obtain purified fly ash. S3. Making slurry: Mix the purified waste incineration fly ash obtained in step S2 with the base materials and auxiliary foaming agent, and wet grind it into slurry using a ball mill. S4. Granulation: The above slurry is spray-granulated to obtain powder particles; S5. Firing: The powder particles obtained in step S4 are filled into the mold and calcined in air atmosphere at a sintering temperature of 1100℃ to 1250℃ to obtain a semi-finished foamed material. S6. Cutting and shaping: Cut the semi-finished foamed material to obtain the finished foamed material.

2. The process for preparing foamed materials using fly ash from waste incineration according to claim 1, characterized in that, In step S1, the waste incineration fly ash undergoes pyrolysis treatment in a pyrolysis device, the pyrolysis device comprising: A drive motor and a rotary mixing chamber connected to the output shaft of the drive motor. The rotary mixing chamber includes a circular base plate and an annular side plate connected to the side edge of the circular base plate. The circular base plate is arranged coaxially with the output shaft of the drive motor. The circular base plate has a nitrogen inlet hole. The annular side plate and the circular base plate form a total mixing cavity. The annular side plate forms an opening of the total mixing cavity on the side opposite to the circular base plate. A first sealing structure and a second sealing structure. The first sealing structure has a nitrogen inlet transfer chamber connected to a nitrogen supply source. The second sealing structure has a fly ash inlet transfer chamber and a fly ash outlet transfer chamber. The nitrogen inlet transfer chamber can communicate with the mixing chamber through a nitrogen inlet hole. Both the fly ash inlet transfer chamber and the fly ash outlet transfer chamber can communicate with the mixing chamber through an opening in the mixing chamber.

3. The process for preparing foamed materials using fly ash from waste incineration according to claim 2, characterized in that, The first sealing structure includes a first sealing plate, a nitrogen inlet transfer chamber disposed on the first sealing plate, a nitrogen inlet transfer chamber being provided with a nitrogen inlet pipe, the nitrogen inlet transfer chamber being connected to the nitrogen supply source through the nitrogen inlet pipe, the first sealing plate having a first through hole communicating with the nitrogen inlet transfer chamber, the rotating mixing chamber located at one end of the circular base plate being rotatably sealed to the first sealing plate, and the first sealing plate being sealed to the circular base plate, the rotating mixing chamber being able to rotate to a position where the first through hole and the nitrogen inlet hole are connected; The second sealing structure includes a second sealing plate. The fly ash input transfer chamber and the fly ash output transfer chamber are disposed on the second sealing plate. The second sealing plate seals the opening of the mixing chamber. The fly ash input transfer chamber is provided with a fly ash input pipe and a first valve. The fly ash output transfer chamber is provided with a fly ash output pipe and a second valve. The second sealing plate has a second through hole and a third through hole. The mixing chamber is connected to the fly ash input transfer chamber through the second through hole, and the mixing chamber is connected to the fly ash output transfer chamber through the third through hole.

4. The process for preparing foamed materials using fly ash from waste incineration according to claim 3, characterized in that, The mixing chamber is provided with multiple partitions, which divide the mixing chamber into multiple mixing unit chambers arranged at intervals along the circumference of the circular base plate. The circular base plate is provided with multiple nitrogen inlet holes at positions corresponding to each mixing unit chamber. The rotating mixing chamber can be rotated to a position where the first through hole is connected to all the nitrogen inlet holes corresponding to the same mixing unit chamber.

5. The process for preparing foamed materials using fly ash from waste incineration according to claim 4, characterized in that, The second and third through holes are aligned with and connected to different mixing unit cavities, respectively.

6. The process for preparing foamed materials using fly ash from waste incineration according to claim 3, characterized in that, The outer edge of the first sealing plate forms a first sealing edge, and the outer edge of the second sealing plate forms a second sealing edge. Both the first sealing edge and the second sealing edge are sealed to the outer side of the annular side plate.

7. The process for preparing foamed materials using fly ash from waste incineration according to claim 6, characterized in that, A first sealing bearing is provided between the first sealing edge and the outer side of the annular side plate, and a second sealing bearing is provided between the second sealing edge and the outer side of the annular side plate.

8. The process for preparing foamed materials using fly ash from waste incineration according to claim 2, characterized in that, The nitrogen gas supply is located between the nitrogen gas transfer chamber and the nitrogen gas supply source, and there is a nitrogen gas heating chamber.

9. The process for preparing foamed materials using fly ash from waste incineration according to any one of claims 1 to 8, characterized in that, The water washing and dechlorination treatment in step S2 includes: mixing the pyrolyzed fly ash obtained from the pyrolysis of the waste incineration fly ash obtained in step S1 with the washing liquid at a solid-liquid ratio of 1:4 to 1:8, and mechanically stirring and washing at 30°C to 60°C for 30 to 60 minutes. After washing, solid and liquid separation is performed to obtain the water-washed fly ash and chlorine-containing wastewater, wherein the washing liquid is deionized water or a dilute nitric acid or dilute acetic acid solution with a pH value adjusted to 3 to 5.

10. The process for preparing foamed materials using fly ash from waste incineration according to any one of claims 1 to 8, characterized in that, The auxiliary foaming agent includes one or more of silicon carbide, calcium carbonate, and silicon dioxide, and the base materials include clay, lithium tailings, feldspar, hydroxy acid salts, and polyacrylates.

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