A radioactive nuclide 137 Rapid Remediation Device and Method for Cs-Contaminated Soil

Abstract

A radioactive nuclide 137 A rapid remediation device and method for Cs-contaminated soil includes an inlet for adding an activator and raw materials, a power supply, a microwave device, an auxiliary extrusion rod, a pressure plate containing a spray head, and a solid pressure plate. The solid pressure plate is located above the pressure plate containing the spray head, and the power supply and microwave device are positioned above the solid pressure plate. A spray head is provided on the pressure plate containing the spray head, and the auxiliary extrusion rod passes through the solid pressure plate and enters the spray head to extrude it. The spray head contains the activator and raw materials, and the auxiliary extrusion rod pushes the activator and raw materials into the soil. This application's solution combines microwave and solidification technologies to achieve remediation of soil containing radioactive nuclides. 137 Advantages of Cs in soil remediation.

Description

Technical Field

[0001] This invention relates to the field of nuclear safety technology in environmental protection, specifically to a handheld rapid repair method for radionuclides based on microwave-accelerated curing. 137 Apparatus and method for soil contamination by Cs (Cesium-137). Background Technology

[0002] With the development and widespread application of nuclear energy, the problem of radioactively contaminated soil has gradually attracted attention. This soil mainly originates from nuclear waste treatment and storage facilities, as well as the mining of radioactive minerals (uranium ore, rare earth associated minerals). Because the half-lives of radioactive materials can last for decades or even millennia, this contamination poses a long-term threat to the environment and human health. However, traditional methods for treating radioactively contaminated soil include chemical, biological, and physical treatments. While these methods can reduce the radioactivity in the soil, they have limitations. For example, soil washing technology in chemical remediation, although effective, involves large-scale engineering and is costly, making large-scale application difficult. Bioremediation technologies involving plants, animals, and microorganisms have strict requirements for external environmental conditions and require long remediation times. Physical remediation methods such as soil replacement / incineration are costly and energy-intensive, and can easily damage the soil's ecological structure and cause secondary pollution. Therefore, developing a rapid, effective, and environmentally friendly device and method for remediating radioactively contaminated soil is of great significance.

[0003] In recent years, the application of microwave technology in the environmental protection field has gradually gained attention. Microwave technology stands out due to its ability to heat materials efficiently and uniformly; secondly, the rapid vibration of molecules under microwave influence causes chemical bonds to break, significantly accelerating chemical reactions; and thirdly, its ability to heat rapidly to a preset temperature in a short time, thus greatly reducing energy consumption. Furthermore, in solidification technology, the addition of microwaves significantly improves solidification efficiency and effectiveness. On the one hand, microwave heating can quickly and uniformly heat materials, avoiding the high costs and energy consumption of soil replacement / incineration methods; on the other hand, microwave technology can accelerate chemical reactions and improve solidification efficiency. When microwaves are combined with solidification technology, they can solve the problems of limited large-scale application in soil washing technology and the strict requirements for external environmental conditions and long remediation times in bioremediation technology. Therefore, with its rapid and uniform heating characteristics, improved chemical reaction efficiency, environmental friendliness and energy saving, and minimal impact on soil microorganisms, microwave technology has broad prospects and profound significance in the field of contaminated soil remediation. Summary of the Invention

[0004] This application addresses the aforementioned shortcomings of the prior art by providing a method that combines microwave and curing technologies to achieve the curing of radioactive nuclides. 137 Cs-based soil remediation using radioactive nuclides137 Rapid remediation device for Cs contaminated soil.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is: a radioactive nuclide. 137 The rapid remediation device for Cs-contaminated soil includes an activator and raw material addition port, a power supply, a microwave device, an auxiliary extrusion rod, a pressure plate containing a spray head, and a solid pressure plate (the two plates do not need to be connected; the solid pressure plate is simply placed on top). The solid pressure plate is located above the pressure plate containing the spray head, and the power supply and microwave device are positioned above the solid pressure plate. The pressure plate containing the spray head has a spray head, and the auxiliary extrusion rod passes through the solid pressure plate and enters the spray head to extrude the spray head. The spray head contains the activator and raw materials, and the auxiliary extrusion rod pushes the activator and raw materials into the soil.

[0006] Using the above-described scheme, the device of this application integrates a microwave device, an auxiliary extrusion rod, and a jet head. The auxiliary extrusion rod and jet head deliver the activator and raw materials into the soil, thereby reacting with radioactive nuclides in the soil. 137 Cs(cesium-137) reacts to form a stable geopolymer; finally, utilizing the rapid and uniform heating of microwaves and the properties of low-melting-point additives (rapid sintering), the resulting product containing Cs(cesium-137) is sintered in a short time (0.5h-1h). 137 Cs geopolymer rapid curing and molding; the device of this application can achieve rapid curing and solidification combination, and can quickly dispose of radionuclides. 137 Cs contaminated soil, to achieve 137 Cs rapidly solidifies, greatly enhancing the performance of nuclides. 137 The efficiency of emergency treatment of Cs-contaminated soil reduces the risk of radionuclides spreading into the environment and safeguards the environment and the safety of life and property.

[0007] Furthermore, the power source is a lithium battery, used to power the microwave device; this structure allows for easy implementation of the microwave device's functions without the need for an external power cord.

[0008] Furthermore, the spray head protrudes from the bottom surface of the pressure plate containing the spray head, and this structure facilitates the entry of the activator and raw materials into the soil.

[0009] Furthermore, the sidewall of the solid pressure plate is provided with an assembly structure, which is used for assembling adjacent solid pressure plates; by adopting this structure, the area of ​​the device of this application can be expanded when large-area soil treatment is carried out, thereby improving the treatment efficiency.

[0010] Furthermore, four microwave devices are provided, located at the four corners of the solid pressure plate; this structure allows for more uniform heating, resulting in more even soil heating and better soil solidification.

[0011] Furthermore, the pressure plate containing the spray nozzle is equipped with one spray nozzle every 10cm x 10cm; this allows for more even soil remediation.

[0012] This application also provides a method utilizing the above-mentioned radionuclides. 137 The method for rapid remediation of Cs-contaminated soil using a Cs-contaminated soil remediation device includes the following specific steps:

[0013] (1) First, place the radioactive nuclide of the device 137 The rapid remediation device for Cs-contaminated soil is placed on top of the soil to be treated. Then, low-melting-point additives and active silica-alumina raw materials are poured into the space between the solid pressure plate and the nozzle plate. Next, using an auxiliary extrusion rod, the pressure plate equipped with the nozzle (with the upper pressure plate stationary, the nozzle itself is pressed down into the soil; the solid pressure plate has slide rails on its side walls and grooves on the opposite side, allowing the slide rails to slide within the grooves, thus combining multiple solid pressure plates; alternatively, corresponding slide rails and grooves can be installed on the other pair of side walls to extend the solid pressure plate to all sides; this structure allows for expansion of the device's area and improved treatment efficiency when treating large areas of soil) is pressed down into the soil.

[0014] (2) Next, the low melting point additive and active silicon-aluminum raw material are extruded into the soil to a depth of 5cm using an auxiliary extrusion rod;

[0015] (3) Subsequently, the ternary composite activator was poured into the space between the solid pressure plate and the nozzle, and the auxiliary extrusion rod was used again to squeeze the ternary composite activator to a depth of 5 cm below the soil surface; the activator reacted with the active silica-alumina raw material and 137 Cs-contaminated soil undergoes a chemical reaction to generate stable geopolymers.

[0016] (4) Finally, the microwave device is activated to rapidly and uniformly heat the product, taking advantage of the characteristics of the low-melting-point additive (rapid sintering), thus promoting the formation of the product containing... 137 Cs geopolymer rapidly cures and molds.

[0017] Furthermore, the low-melting-point additive is phosphate glass powder, and the active aluminosilicate raw material is high-alumina slag.

[0018] Furthermore, the ternary composite activator is sodium hydroxide, calcium hydroxide, and sodium carbonate, with a weight ratio of 1:1.5-3:0.5-1.5.

[0019] Furthermore, the weight ratio of the active silicon-aluminum raw material, the ternary composite activator, and the low-melting-point additive is 20-30:18-22:1.

[0020] Furthermore, the weight ratio of the active silicon-aluminum raw material, the ternary composite activator, and the low-melting-point additive is 25:20:1.

[0021] Furthermore, this method is applicable to [the following]: 137 Cs is greater than 1.48x10 -2 Soil remediation treatment at Bq / g.

[0022] Furthermore, the heating time for rapid and uniform heating by starting the microwave device is 0.5h-1h.

[0023] The advantages and beneficial effects of this application are as follows:

[0024] 1. Compared with traditional remediation methods, this application introduces activated aluminosilicate raw materials (high-alumina slag), ternary composite activators (sodium hydroxide, calcium hydroxide, and sodium carbonate), and low-melting-point additives (phosphate glass powder) as solidification agents for radioactive nuclides. 137 Based on the raw materials of Cs-contaminated soil, a method and device combining microwave rapid curing and solidification processes can be used to rapidly dispose of radionuclides. 137 Cs contaminated soil, to achieve 137 Cs rapid solidification; this method and apparatus greatly enhance the efficiency of nuclides. 137 The efficiency of emergency treatment of Cs-contaminated soil has reduced the risk of radionuclides entering the environment and protected the environment and the safety of life and property.

[0025] 2. The active silica-alumina raw material used in this application is mainly high-alumina slag, which provides the silicon and aluminum elements required to generate geopolymers and generates a special three-dimensional network structure of geopolymer hydration products through geopolymerization reaction. The type, composition and properties of the raw material directly affect the performance of the geopolymer, such as mechanical strength, chemical stability and thermal stability. The selection of the above-mentioned active silica-alumina raw material can improve the mechanical strength, chemical stability and thermal stability of the geopolymer obtained in this application.

[0026] 3. In the preparation process of this application, the main function of using low-melting-point additives is to reduce the formation temperature of geopolymer, thereby effectively saving energy and economic costs; while the active silica-alumina raw materials and ternary composite activators produce geopolymer cementitious materials through geopolymerization reaction, which can effectively fix radionuclides in radioactive contaminated soil; moreover, this application uses an auxiliary extrusion rod to press the pressure plate equipped with the injection head into the soil, while avoiding direct contact between contaminated soil disposal personnel and the soil, reducing the probability of radioactive hazards; considering the soil density and the internal capacity of the device, pressing the pressure plate into the soil to a depth of 5cm is the optimal choice.

[0027] 4. In the preparation process of this application, a low-melting-point additive (phosphate glass powder) and active aluminosilicate raw material (high-alumina slag) are compressed into the soil to a depth of 5 cm using an auxiliary extrusion rod. Subsequently, a ternary composite activator solution (sodium hydroxide: calcium hydroxide: sodium carbonate = 1:2:1) is poured into the space between the solid pressure plate and the nozzle, and the handle is again secured using the auxiliary extrusion rod to compress the ternary composite activator to a depth of 5 cm below the soil surface. It is important to note that the low-melting-point additive, aluminosilicate raw material, and ternary composite activator solution cannot be added simultaneously, as the low-melting-point additive and active aluminosilicate raw material are in powder form, while the ternary composite activator solution is in liquid form. Simultaneous addition would cause a chemical reaction, reducing the fluidity of the mixture and making effective extrusion difficult. These activators react chemically with the active aluminosilicate raw material and 137Cs-contaminated soil to generate a stable geopolymer. Finally, utilizing the rapid and uniform heating of microwaves and the characteristics of the low-melting-point additive (rapid sintering), the generated geopolymer is accelerated within a short time (0.5-1 hour). 137 Cs geopolymer rapidly cures and molds.

[0028] 5. This application is the first to effectively combine microwaves, activated aluminosilicate raw materials, ternary composite activators, and low-melting-point additives. Firstly, the formation temperature of geopolymers is lowered by using specific low-melting-point additives (phosphate glass powder) and activated aluminosilicate raw materials (high-alumina slag), thereby effectively saving energy and reducing disposal costs. Then, specific ternary composite activators (sodium hydroxide, calcium hydroxide, and sodium carbonate) and activated aluminosilicate raw materials are used... 137 After a chemical reaction, Cs-contaminated soil generates stable geopolymers, which can effectively immobilize radionuclides in the contaminated soil. Finally, by utilizing the rapid and uniform heating of microwaves and the properties of low-melting-point additives (rapid sintering), the formation of Cs-contaminated soil containing radionuclides is accelerated within a short time (0.5h-1h). 137 Cs geopolymer rapidly cures and molds. Attached Figure Description

[0029] Figure 1 For the radionuclides of this application137 Schematic diagram of a rapid remediation device for Cs-contaminated soil.

[0030] Figure 2 For the radionuclides of this application 137 Cross-sectional view of the rapid remediation device for Cs-contaminated soil.

[0031] Figure 3 For the radionuclides of this application 137 Cross-sectional view of the rapid remediation device for Cs contaminated soil (state after the auxiliary extrusion rod is pressed down).

[0032] Figure 4 This is a schematic diagram of the structure that allows for the assembly of solid pressure plates.

[0033] As shown in the attached diagram: 1. Initiator and raw material addition port, 2. Power supply, 3. Microwave device, 4. Auxiliary extrusion rod, 5. Pressure plate with nozzle, 501. Nozzle, 6. Solid pressure plate, 601. Slide rail, 602. Slide groove. Detailed Implementation

[0034] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are merely preferred embodiments, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] Furthermore, it should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or it may be fixed via another intermediate component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or it may be fixed via another intermediate component. When a component is referred to as being "set on" another component, it can be set directly on the other component or it may be fixed via another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] The following description uses specific embodiments and the following apparatus:

[0037] As attached Figure 1-4 The image shows a radionuclide of this application.137 The rapid remediation device for Cs contaminated soil includes an activator and raw material addition port 1, a power supply 2, a microwave device 3, an auxiliary extrusion rod 4, a pressure plate 5 containing a spray head, and a solid pressure plate 6. The solid pressure plate 6 is located above the pressure plate 5 containing the spray head. The power supply 2 and the microwave device 3 are positioned above the solid pressure plate 6 (on its upper surface; the power supply provides power to the microwave device, and they can be connected via an internal power cord). The pressure plate 5 containing the spray head is equipped with a spray head 501. The auxiliary extrusion rod 4 passes through the solid pressure plate 6. The material is fed into the spray head 5 and used to compress the spray head 5 (an auxiliary compression rod is slidably fitted inside the spray head, the two are adapted to each other, and used to push the material inside the spray head into the soil; a through hole for the auxiliary compression rod to slide into is provided on the upper solid plate, and a cavity for accommodating the material and the end of the auxiliary compression rod is provided on the lower pressure plate containing the spray head, the cavity being connected to the spray head located on the bottom surface of the pressure plate of the spray head, so that the material enters the soil through the spray head); the spray head 5 is used to contain the activator and raw materials, and the auxiliary compression rod 4 is used to push the activator and raw materials into the soil.

[0038] Using the above-described scheme, the device of this application integrates a microwave device, an auxiliary extrusion rod, and a jet head. The auxiliary extrusion rod and jet head deliver the activator and raw materials into the soil, thereby reacting with radioactive nuclides in the soil. 137 Cs(cesium-137) reacts to form a stable geopolymer; finally, utilizing the rapid and uniform heating of microwaves and the properties of low-melting-point additives (rapid sintering), the resulting product containing Cs(cesium-137) is sintered in a short time (0.5h-1h). 137 Cs geopolymer rapid curing and molding; the device of this application can achieve rapid curing and solidification combination, and can quickly dispose of radionuclides. 137 Cs contaminated soil, to achieve 137 Cs rapidly solidifies, greatly enhancing the performance of nuclides. 137 The efficiency of emergency treatment of Cs-contaminated soil reduces the risk of radionuclides spreading into the environment and safeguards the environment and the safety of life and property.

[0039] As an example, the power source 2 described in this application is a lithium battery (portable rechargeable battery) used to power the microwave device 3. With this structure, the function of the microwave device can be easily realized without the need for an external power cord. Moreover, it is easy to carry and more conducive to outdoor operation.

[0040] As attached Figure 2-3As shown, the spray head 501 of this application protrudes from the bottom surface of the pressure plate 5 containing the spray head, that is, multiple spray head structures are integrally set directly on the lower surface of the pressure plate. With this structure, it is convenient for the activator and raw materials to enter the soil. Figure 3 This diagram illustrates the structure used to press the material into the soil below, with the bottommost structure representing the soil structure, where the injection head is inserted into the soil.

[0041] As attached Figure 4 As shown, the solid pressure plate 6 described in this application has an assembly structure on its sidewalls, which is used for assembling adjacent solid pressure plates. Specifically, a slide rail can be provided on one sidewall of the pressure plate, and a slide groove can be provided on the opposite side. The slide rail slides into the slide groove to achieve the combination of multiple solid pressure plates. Of course, corresponding slide rail and slide groove structures can also be provided on the other pair of sidewalls to extend the solid pressure plates on each side. With this structure, when treating a large area of ​​soil, the area of ​​the device of this application can be expanded, and the treatment efficiency can be improved.

[0042] As attached Figure 1 As shown, the microwave device 3 described in this application is provided in four parts, which are located at the four corners of the solid pressure plate 6. With this structure, heating can be carried out more evenly, so that the soil is heated evenly and is more conducive to soil solidification.

[0043] As an example, the pressure plate 5 containing spray heads described in this application is configured with one spray head 501 every 10cm x 10cm; this can achieve more even soil remediation.

[0044] Both the solid pressure plate and the pressure plate containing the spray head in this application are cuboid structures, stacked one on top of the other.

[0045] Example 1

[0046] First, slowly pour the low-melting-point additive (phosphate glass powder) and activated aluminosilicate raw material (high-alumina slag) into the space between the solid pressure plate and the nozzle plate. Using an auxiliary extrusion rod to hold the solid pressure plate, force the low-melting-point additive (phosphate glass powder) and activated aluminosilicate raw material (high-alumina slag) into the soil to a depth of 5cm (pressing the nozzle tip 5cm into the soil). Then, pour the ternary composite activator (sodium hydroxide: calcium hydroxide: sodium carbonate = 1:2:1) into the space between the solid pressure plate and the nozzle, and again use the auxiliary extrusion rod to hold the handle, squeezing the ternary composite activator to a depth of 5cm below the soil surface. These activators, along with the activated aluminosilicate raw material and... 137Cs-contaminated soil undergoes a chemical reaction and is then microwave-sintered (within 0.5-1 hour) to generate a stable geopolymer. The weight ratio of the aforementioned active silica-alumina raw material, ternary composite activator, and low-melting-point additive is 25:20:1. The geopolymer exhibits a leaching resistance (leaching rate) of 1.26 × 10⁻⁶ after a cumulative leaching time of 42 days in deionized water at 25°C. -4 cm / d, the compressive strength of the geopolymer is 27.5 MPa.

[0047] Example 2

[0048] Activated aluminosilicate raw materials (high-alumina slag) and ternary composite activators (sodium hydroxide, calcium hydroxide, and sodium carbonate) are mixed, while low-melting-point additives (phosphate glass powder) are added. These activators react with the activated aluminosilicate raw materials and... 137 Cs-contaminated soil undergoes a chemical reaction and is then microwave-sintered at 700℃ for 1 hour to generate a stable geopolymer. The weight ratio of the aforementioned active silica-alumina raw material, ternary composite activator, and low-melting-point additive is 24:20:1. The geopolymer undergoes a cumulative leaching time of 42 days in deionized water at 25℃. 137 The leaching resistance (leaching rate) of Cs is 1.25 × 10⁻⁶. -4 cm / d, the compressive strength of the geopolymer is 28.3 MPa.

[0049] Comparative Example 1

[0050] Solidified Body No. 1: Fly ash and SrSO4 were mixed in equal proportions of 30 wt.%, and then the mixture was wet-milled in mortar with alcohol as the medium. After uniform pulverization, it was dried again and cold isostatically pressed at 200 MPa into pellets with a diameter of 10 mm and a thickness of 3 mm. Subsequently, it was microwave sintered at 1300℃ for 30 minutes, with a leaching resistance of 0.4 × 10⁻⁶. -3 cm / d, compressive strength is 11.5MPa.

[0051] This comparative example is a preparation process of geopolymer ceramics conducted by other researchers. It is not related to this scheme and is a specific example for comparison with this scheme.

[0052] Comparative Example 2

[0053] Cured Body No. 2: An alkaline activator prepared from boron oxide, kaolin, and other powders with silica sol, sodium hydroxide, and cesium hydroxide is mixed and stirred. Ultrasonic oscillation is used to remove as many air bubbles as possible from the slurry. After 40 minutes, an aluminosilicate polymer slurry is obtained. The slurry is poured into a pre-prepared mold, sealed in a sealed bag, and then cured in a constant-temperature forced-air drying oven at 60℃ for 7 days to obtain the geopolymer cured body, with an leaching resistance of 5x10⁻⁶. -4 cm / d, compressive strength is 18.9MPa.

[0054] Comparative Example 3

[0055] Solidified material No. 3: First, an alkali activator prepared from sodium hydroxide (10M) and sodium silicate solution was mixed with metakaolin and stirred for 5 minutes. Then, the slurry was poured into a plastic mold with a diameter of 15 mm; it was vibrated for 5 minutes to remove air from the slurry, sealed, and stored at room temperature for 72 hours. The geopolymer sample was then pulverized into a fine powder of 0.5 mm and sieved. The geopolymer sample was then calcined at 1000℃ for 2 hours, yielding a leaching resistance of 3.35 × 10⁻⁶. -4 cm / d geopolymer solids.

[0056] Based on the above examples and comparative examples, and according to the explicit provisions in my country's national standard "Requirements for Solidified Bodies of Low and Intermediate Level Radioactive Waste - Cement Solidified Bodies" (GB 14569.1-2011), the leaching resistance of the solidified body should meet the following requirements: Cs + The leaching rate was less than 4 × 10 on day 42. -3 The compressive strength of the cured body is higher than 7 MPa, indicating that the geopolymer prepared using the apparatus and method of this application fully meets the above requirements. This application combines microwave and curing technologies, and simultaneously selects specific ternary composite activators and low-melting-point additives to obtain geopolymers with excellent mechanical strength, stable chemical properties, and good thermal stability under shorter curing times, thereby achieving the control of radionuclides. 137 Rapid remediation of Cs-contaminated soil.

Claims

1. A radioactive nuclide 137 The rapid remediation device for Cs-contaminated soil is characterized by: The device includes an inlet for adding activator and raw materials, a power supply, a microwave device, an auxiliary extrusion rod, a pressure plate containing a nozzle, and a solid pressure plate. The solid pressure plate is located above the pressure plate containing the nozzle. The power supply and microwave device are positioned above the solid pressure plate. The pressure plate containing the nozzle has nozzles. The auxiliary extrusion rod passes through the solid pressure plate and enters the nozzle to extrude the nozzle. The nozzle contains the activator and raw materials, and the auxiliary extrusion rod pushes the activator and raw materials into the soil. Four microwave devices are provided, located at the four corners of the solid pressure plate.

2. The radionuclide according to claim 1 137 The rapid remediation device for Cs-contaminated soil is characterized by: The power source is a lithium battery, which is used to power the microwave device.

3. The radionuclide according to claim 1 137 The rapid remediation device for Cs-contaminated soil is characterized by: The spray head protrudes from the bottom surface of the pressure plate containing the spray head.

4. The radionuclide according to claim 1 137 The rapid remediation device for Cs-contaminated soil is characterized by: The solid pressure plate has an assembly structure on its side wall, which is used for assembling adjacent solid pressure plates.

5. The radionuclide according to claim 1 137 The rapid remediation device for Cs-contaminated soil is characterized by: The pressure plate containing the spray head is configured with one spray head every 10cm x 10cm.

6. A method utilizing the radionuclide according to any one of claims 1-5 137 A method for soil remediation using a rapid Cs-contaminated soil remediation device, characterized by: The specific steps include: (1) First, the radioactive nuclide 137 The rapid remediation device for Cs contaminated soil is placed on top of the soil to be treated; then, low-melting-point additives and active silica-alumina raw materials are poured into the space between the solid pressure plate and the nozzle plate; then, using an auxiliary extrusion rod, the pressure plate equipped with the nozzle is pressed down into the soil; (2) Next, the low melting point additive and active silicon aluminum raw material are squeezed into the soil to a depth of 5cm by using the auxiliary extrusion rod to hold the solid pressure plate. (3) Subsequently, the ternary composite activator is poured into the space between the solid pressure plate and the nozzle, and the handle is held in place again using the auxiliary extrusion rod to squeeze the ternary composite activator to a depth of 5 cm below the soil surface; the activator reacts with the active silica-alumina raw material and 137 Cs-contaminated soil undergoes a chemical reaction to generate stable geopolymers. (4) Finally, the rapid and uniform heating of the microwave device and the characteristics of the low-melting-point additives promote the formation of the product containing... 137 Cs geopolymer rapidly cures and molds.

7. The soil remediation method according to claim 6, characterized in that: The low-melting-point additive is phosphate glass powder, and the active aluminosilicate raw material is high-alumina slag; the ternary composite activator is sodium hydroxide, calcium hydroxide, and sodium carbonate, with a weight ratio of 1:1.5-3:0.5-1.5; the weight ratio of the active aluminosilicate raw material, the ternary composite activator, and the low-melting-point additive is 20-30:18-22:1; the heating time for rapid and uniform heating with the microwave device is 0.5h-1h.

8. The soil remediation method according to claim 7, characterized in that: The ternary composite activator is sodium hydroxide, calcium hydroxide and sodium carbonate, with a weight ratio of 1:2:1; the weight ratio of the active silicon-aluminum raw material, the ternary composite activator and the low melting point additive is 25:20:

1.

9. The soil remediation method according to claim 7, characterized in that: This method is applicable to containing 137 Remediation treatment for soils with Cs greater than 1.48 x 10⁻² Bq / g.

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