Multi-element solid waste and co2 mineralization simulation experiment device and method

Abstract

The application discloses a kind of multi-solid waste synergic CO2 mineralization simulation experimental device and method, including multi-solid waste injection control system, CO2 injection and pressure control system, data acquisition system, multi-solid waste mixing system and solid waste mineralization simulation sampling system;Multi-solid waste injection control system is nitrogen as power push multiple solid waste suspension, through mass flowmeter accurate control each solid waste's mixing ratio, simultaneously provide inert environment to avoid solid waste advance oxidation and mineralization;Multi-solid waste mixing system realizes the full mixing of multi-solid waste suspension by vibration table;Solid waste mineralization simulation sampling system is built-in movable sealing plate, and the original mineralization product can be pushed out by bottom water injection hole to push sealing plate as a whole. The application can realize multi-solid waste synergic CO2 mineralization simulation experiment under different proportion, temperature, pressure conditions, with the advantages of accurate proportion, fully mixed, sampling lossless, to provide reliable experimental platform for multi-solid waste synergic mineralization law and mechanism research.

Description

Technical Field

[0001] This invention relates to the field of environmental engineering geology and solid waste resource utilization technology, specifically to an experimental apparatus and method for simulating the synergistic CO2 mineralization process of various industrial solid wastes such as fly ash, coal gangue, and steel slag. Background Technology

[0002] Currently, billions of tons of bulk industrial solid waste, such as steel slag, fly ash, and coal gangue, are generated annually, accumulating to a massive amount. This not only occupies land resources but also poses ecological risks such as heavy metal leaching and dust pollution. Furthermore, large quantities of solid waste resources containing calcium and magnesium active components are left idle and wasted. Therefore, synergistic technologies for the harmless treatment of industrial solid waste and CO2 emission reduction and storage have become a key research focus in the field of low-carbon environmental protection.

[0003] CO2 mineralization carbon sequestration technology utilizes the alkaline calcium and magnesium components in solid waste to react with CO2 in a carbonation reaction, generating stable carbonate minerals. This simultaneously achieves permanent CO2 sequestration, solid waste harmlessness, and resource utilization. Compared to single-waste mineralization, multi-waste synergistic mineralization can overcome the shortcomings of single-waste active components, low reaction efficiency, and poor product stability through component complementarity and reaction coupling effects, significantly increasing carbon sequestration and solid waste utilization rate, and has broader prospects for industrial application.

[0004] However, existing solid waste mineralization experiments mostly employ conventional high-pressure reactors, which have the following significant drawbacks: First, the mixing ratio of multiple solid wastes cannot be precisely controlled, and the solid wastes are prone to premature oxidation or pre-mineralization upon contact with air during feeding, affecting experimental accuracy. Second, multi-component solid wastes are often directly added to the reactor for mixing, resulting in poor mixing and premature contact with CO2, making it impossible to achieve independent process control of "mixing before mineralization." Third, sampling after the reaction is often done by opening the reactor and scraping or extracting the slurry, which easily damages the original structure of the mineralization products, making it impossible to obtain complete solid-phase mineralization products for subsequent characterization and analysis. Currently, there is no integrated simulation experimental device specifically designed for the synergistic mineralization of multi-component solid wastes, which severely restricts the research progress on the synergistic mineralization mechanism and process parameter optimization of multi-component solid wastes. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a simulation experimental device and method for the synergistic CO2 mineralization of multiple solid wastes. This method enables an integrated experimental simulation of the entire process, including precise proportioning and feeding of multiple solid wastes, premixing in an inert environment, controlled temperature and pressure mineralization, and non-destructive sampling of undisturbed products. It provides a standardized testing platform for the study of the laws and mechanisms of synergistic CO2 mineralization of multiple industrial solid wastes.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a multi-component solid waste synergistic CO2 mineralization simulation experimental device, characterized in that it includes a multi-component solid waste injection control system, a CO2 injection and pressure control system, a data acquisition system, a multi-component solid waste mixing system, and a solid waste mineralization simulation sampling system.

[0007] The multi-component solid waste injection control system includes a nitrogen cylinder, at least two sets of solid waste suspension containers, and a mass flow meter corresponding to each solid waste suspension container. The nitrogen cylinder is connected to the inlet of each solid waste suspension container via a pipeline, which is then connected to a pressure reducing valve, a gas valve, and a first gas pressure controller. The outlet of each solid waste suspension container is connected to the multi-component solid waste mixing system via the corresponding mass flow meter. At the same time, the nitrogen atmosphere can prevent the oxidation or premature mineralization of the active components of the solid waste.

[0008] The multi-component solid waste mixing system includes a sealed mixing container and a vibrating table. The mixing container is placed on the vibrating table, and the top of the mixing container is respectively provided with a feed inlet, a first exhaust port, and a gas pressure injection port. The feed inlet is connected to the liquid outlet of the multi-component solid waste injection control system, and the gas pressure injection port is connected to the gas outlet branch of a nitrogen cylinder. The multi-component solid waste suspension enters the mixing container under nitrogen protection and is thoroughly and uniformly mixed by vibration on the vibrating table, all within an inert environment.

[0009] The solid waste mineralization simulation sampling system includes a mineralization reaction container and a constant-temperature oil bath. The mineralization reaction container is placed inside the constant-temperature oil bath for temperature control. The mineralization reaction container has a movable sealing plate that can slide up and down, dividing the container into an upper solid waste mineralization product chamber and a lower water chamber. A water injection hole is located at the bottom of the container, communicating with the water chamber. The mineralization reaction takes place within the product chamber. During sampling, water is injected through the water injection hole to increase pressure, pushing the movable sealing plate upwards and ejecting the solid mineralization product as a whole.

[0010] The CO2 injection and pressure control system includes a CO2 cylinder, which is connected to the air inlet of the solid waste mineralization product cavity via a pressure reducing valve, a gas valve, and a second pressure controller; it is used to introduce CO2 into the mineralization reaction vessel and precisely control the mineralization pressure to simulate different pressure conditions.

[0011] The data acquisition system, with a computer at its core, is connected to various mass flow meters, pressure controllers, and constant temperature oil baths to collect flow, pressure, and temperature parameters in real time, enabling digital monitoring of the experimental process.

[0012] Furthermore, each solid waste suspension container is equipped with a stirrer to continuously stir and maintain the uniform suspension state of the solid waste suspension.

[0013] Furthermore, the top of the mixing container is provided with a first sealing cover, and the feed inlet, the first exhaust port, and the air pressure injection port are all opened on the first sealing cover. A first exhaust valve is installed at the first exhaust port.

[0014] Furthermore, a second sealing cover is provided on the top of the mineralization reaction vessel, and the feed end, air inlet end and second exhaust port of the solid waste mineralization product cavity are all provided on the second sealing cover, and a second exhaust valve is installed at the second exhaust port.

[0015] Furthermore, a multi-component solid waste outflow valve and a multi-component solid waste inflow valve are sequentially installed on the connecting pipeline between the mixing container and the mineralization reaction container.

[0016] Furthermore, the solid waste suspension container is provided in three sets, which are used to hold fly ash suspension, coal gangue suspension and steel slag suspension respectively.

[0017] The method for conducting a simulation experiment on the synergistic CO2 mineralization of multiple solid wastes using the above-mentioned device includes the following steps: S1. System inertization pretreatment: Open the nitrogen cylinder and purge the mixing container and the mineralization reaction container with nitrogen for 3-10 minutes at a pressure of 0.1-0.3 MPa. After purging the air from the containers, close all exhaust passages.

[0018] S2. Preset constant temperature environment: Turn on the constant temperature oil bath, set the target experimental temperature, so that the mineralization reaction vessel is heated as a whole and maintained at a constant temperature.

[0019] S3. Precise feeding and mixing of multiple solid wastes: Set the target injection volume of the corresponding solid waste suspension through each mass flow meter, open the outlet valve of each solid waste suspension, and use nitrogen as power to push each group of solid waste suspensions into the mixing container; after feeding is completed, close the feed valve and the first exhaust valve, turn on the vibration table, the vibration frequency of the vibration table is 100~300r / min, and the mixing time is 5~30min, to vibrate and mix the multiple solid waste suspensions in the mixing container.

[0020] S4. Constant Pressure Mineralization Reaction: After mixing, nitrogen is used to push all the multi-component solid waste suspension in the mixing container into the solid waste mineralization product cavity of the mineralization reaction container; the material conveying passage is closed, the CO2 injection and pressure control system is turned on, CO2 is introduced into the solid waste mineralization product cavity and regulated to the target mineralization pressure by the second pressure controller, and the mineralization reaction is carried out under preset temperature and pressure conditions. The temperature range of the mineralization reaction is 20~80℃, and the mineralization pressure range is 0.1~5MPa.

[0021] S5. Non-destructive sampling of undisturbed products: After the reaction is completed, the CO2 gas source is turned off and the pressure in the mineralization reaction container is slowly released. The second sealing cover is opened, and clean water is injected into the water cavity at a constant speed through the bottom water injection hole. The water pressure pushes the movable sealing plate to move upward and push the undisturbed mineralization products in the solid waste mineralization product cavity out of the container as a whole, thus completing the sampling.

[0022] Compared with the prior art, the present invention has the following advantages: 1. This invention uses multiple sets of mass flow meters to independently control the injection volume of different solid waste suspensions, which can flexibly adjust the mixing ratio of multiple solid wastes; nitrogen is used as the power to push the material, and the inert environment throughout the process avoids oxidation and premature mineralization of the active components of solid waste, thereby improving the accuracy and repeatability of experimental data.

[0023] 2. The present invention sets up an independent mixing container and a vibration table for oscillation and mixing, which results in a more uniform mixing effect compared to the stirring method in the kettle, and can realize independent control of the mixing-mineralization process, making it convenient to study the influence of the degree of mixing on the mineralization effect separately.

[0024] 3. The present invention adopts a sampling structure of movable sealing plate + bottom water injection and ejection, which can eject the mineralized solid product as a whole intact, avoiding the damage to the morphology and pore structure of the product by traditional sampling methods, and providing a complete sample for subsequent mineralogical characterization and microstructure analysis.

[0025] 4. This invention can flexibly adjust the mineralization temperature and pressure through a constant temperature oil bath and a pressure controller to simulate different geological and engineering conditions; it is applicable to single-component or multi-component synergistic mineralization experiments of various industrial solid wastes such as fly ash, coal gangue, steel slag, and carbide slag, and has strong versatility.

[0026] 5. This invention modularizes and integrates the functions of feeding, mixing, mineralization, and sampling. The pipeline and valve layout is clear, and the operation process is coherent, which can effectively improve experimental efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention.

[0028] Figure 2 This is a schematic diagram of the internal structure of the mineralization reaction vessel during the mineralization reaction process of the present invention.

[0029] Figure 3 This is a schematic diagram of the internal structure of the mineralization reaction vessel during the water injection sampling process of this invention.

[0030] In the diagram: I - Multi-element solid waste injection control system, II - CO2 injection and pressure control system, III - Data acquisition system, IV - Multi-element solid waste mixing system, V - Solid waste mineralization simulation sampling system; 1 - Nitrogen cylinder, 2 - Pressure reducing valve, 3 - Gas valve, 4 - First pressure controller, 5 - Solid waste suspension container I, 6 - Solid waste suspension container II, 7 - Solid waste suspension container III, 8 - Agitator, 9 - Mass flow meter I, 10 - Mass flow meter II, 11 - Mass flow meter III; 12 - CO2 cylinder, 13 - Pressure reducing valve, 14 - Gas valve, 15 - Second pressure controller; 6-Solid waste suspension I injection valve, 17-Solid waste suspension II injection valve, 18-Solid waste suspension III injection valve, 19-First vent valve, 20-First sealing cover, 21-Mixing container, 22-Gas pressure injection valve, 23-Multi-component solid waste outflow valve, 24-Vibration table; 25-Computer, 26-Multi-component solid waste inflow valve, 27-Second vent valve, 28-CO2 injection valve, 29-Second sealing cover, 30-Mineralization reaction container, 301-Solid waste mineralization product cavity, 302-Modible sealing plate, 303-Water injection hole, 304-Water cavity; 31-Constant temperature oil bath. Detailed Implementation

[0031] The present invention will be further described below.

[0032] like Figure 1 As shown, the multi-component solid waste synergistic CO2 mineralization simulation experimental device of the present invention consists of five parts: multi-component solid waste injection control system I, CO2 injection and pressure control system II, data acquisition system III, multi-component solid waste mixing system IV, and solid waste mineralization simulation sampling system V.

[0033] The multi-component solid waste injection control system I includes a nitrogen cylinder 1, a pressure reducing valve 2, a gas valve 3, a first gas pressure controller 4, a solid waste suspension container I 5, a solid waste suspension container II 6, a solid waste suspension container III 7, a stirrer 8, a mass flow meter I 9, a mass flow meter II 10, and a mass flow meter III 11. The outlet of the nitrogen cylinder 1 is sequentially connected to the pressure reducing valve 2, the gas valve 3, and the first gas pressure controller 4, and then splits into three paths, which are respectively connected to the top air inlets of the three solid waste suspension containers. Each solid waste suspension container is equipped with a stirrer 8, and the liquid outlet at the bottom is connected to the mixing container 21 through the mass flow meters I 9, II 10, and III 11, respectively, and then through the solid waste suspension I injection valve 16, the solid waste suspension II injection valve 17, and the solid waste suspension III injection valve 18.

[0034] The multi-component solid waste mixing system IV includes a first sealing cover 20, a mixing container 21, a gas pressure injection valve 22, a multi-component solid waste outflow valve 23, and a vibration table 24. The mixing container 21 is a pressure-resistant sealed container placed on the table surface of the vibration table 24; the first sealing cover 20 seals the top of the mixing container 21, and the cover has an inlet, a first vent, and a gas pressure injection port; the first vent is equipped with a first vent valve 19, the gas pressure injection port is connected to a branch pipeline of the nitrogen cylinder 1 via the gas pressure injection valve 22, and the multi-component solid waste outflow valve 23 is installed at the bottom outlet of the mixing container 21.

[0035] The solid waste mineralization simulation sampling system V includes a multi-element solid waste inflow valve 26, a second vent valve 27, a CO2 injection valve 28, a second sealing cover 29, a mineralization reaction vessel 30, and a constant temperature oil bath 31. The mineralization reaction vessel 30 is placed vertically inside the constant temperature oil bath 31. The second sealing cover 29 is placed on the top of the mineralization reaction vessel 30, and the cover has a feed inlet, an air inlet, and a second vent. The multi-element solid waste outflow valve 23 is connected to the multi-element solid waste inflow valve 26 via a pipeline and then connected to the feed inlet. The second vent valve 27 is installed at the second vent.

[0036] like Figure 2 , Figure 3 As shown, the mineralization reaction container 30 is equipped with a movable sealing plate 302 that slides and seals with the inner wall, dividing the interior of the container into an upper solid waste mineralization product cavity 301 and a lower water cavity 304; a water injection hole 303 is opened at the center of the bottom surface of the mineralization reaction container 30, which is connected to the water cavity 304 and connected to an external water injection pipeline.

[0037] The CO2 injection and pressure control system II includes a CO2 cylinder 12, a pressure reducing valve 13, a gas valve 14, and a second pressure controller 15. The outlet of the CO2 cylinder 12 is connected in sequence to the pressure reducing valve 13, the gas valve 14, and the second pressure controller 15, and then connected to the inlet at the top of the mineralization reaction vessel 30 via the CO2 injection valve 28.

[0038] The data acquisition system III includes a computer 25, which is connected to mass flow meter I9, mass flow meter II10, mass flow meter III11, first pressure controller 4, second pressure controller 15, and constant temperature oil bath 31 via data transmission lines to realize real-time acquisition and setting control of flow, pressure, and temperature parameters.

[0039] Simulation Experiment of Co-mineralization of Fly Ash-Coal Gangue-Steel Slag: This embodiment uses three typical industrial solid wastes—fly ash, coal gangue, and steel slag—as raw materials and conducts a synergistic mineralization simulation experiment using the aforementioned device. The specific steps are as follows: S1. Preparation of experimental materials: Take dried fly ash, coal gangue and steel slag and crush them to below 200 mesh. Mix them with deionized water at a solid-liquid mass ratio of 1:10 to prepare fly ash suspension, coal gangue suspension and steel slag suspension respectively. Add them to solid waste suspension container I5, solid waste suspension container II6 and solid waste suspension container III7 respectively. Turn on the stirrer 8 to stir continuously to prevent solid waste from settling.

[0040] S2. System Inertization Purging: Open nitrogen cylinder 1, adjust pressure reducing valve 2 and first pressure controller 4 to control nitrogen pressure to 0.2 MPa; open pressure injection valve 22 and first vent valve 19, purge nitrogen into mixing container 21 for 5 minutes, and close first vent valve 19 after exhausting internal air. Simultaneously open second vent valve 27 and multi-element solid waste inflow valve 26, purge nitrogen into mineralization reaction container 30 for 5 minutes, and close second vent valve 27 and multi-element solid waste inflow valve 26 after exhausting air.

[0041] S3. Preset constant temperature environment: Turn on the constant temperature oil bath 31, set the experimental temperature to 50℃, preheat the mineralization reaction vessel 30, and maintain the constant temperature state after the temperature stabilizes.

[0042] S4. Precise Feeding and Mixing of Multiple Solid Waste Suspensions: The target injection volumes for mass flow meters I9, II10, and III11 are set to 300 mL, 300 mL, and 400 mL respectively (corresponding to a solid waste mass ratio of fly ash: coal gangue: steel slag = 3:3:4) via computer 25. Simultaneously, injection valves 16, II, and III for solid waste suspension I, II, and III are opened. Under nitrogen pressure, the three solid waste suspensions are metered by the mass flow meters and then enter the mixing container 21. After all three mass flow meters reach their set flow rates and feeding stops, the three solid waste suspension injection valves and the first exhaust valve 19 are closed. The vibration table 24 is then turned on, and the oscillation frequency is set to 200 r / min. The mixture is vibrated and mixed for 15 minutes to ensure thorough and uniform mixing of the three solid waste suspensions.

[0043] S5. Constant Pressure Mineralization Reaction: After mixing, the vibrating table 24 is closed, and the gas injection valve 22, the multi-component solid waste outflow valve 23, and the multi-component solid waste inflow valve 26 are opened. Under nitrogen pressure, the mixed multi-component solid waste suspension enters the solid waste mineralization product chamber 301 of the mineralization reaction container 30. Then, the nitrogen cylinder 1, gas valve 3, and related material valves are closed. The CO2 cylinder 12 is opened, and the pressure reducing valve 13 and the second gas pressure controller 15 are adjusted to set the mineralization pressure to 2 MPa. The CO2 injection valve 28 is slowly opened to introduce CO2 into the solid waste mineralization product chamber 301. After the pressure stabilizes at 2 MPa, the mineralization reaction is carried out under constant temperature and pressure conditions for 24 hours. During the reaction, the pressure and temperature changes are monitored in real time by the computer 25.

[0044] S6. Non-destructive sampling of undisturbed mineralized products: After the reaction is completed, close the CO2 cylinder 12 and the second pressure controller 15, and slowly open the second exhaust valve 27 to depressurize the mineralization reaction container 30 until the internal pressure is balanced with the external atmospheric pressure; unscrew the second sealing cap 29. Inject clean water into the water chamber 304 at a uniform speed through the water injection hole 303. As the water volume and water pressure in the water chamber 304 increase, the movable sealing plate 302 is pushed smoothly upward along the inner wall of the container, thereby pushing the undisturbed mineralized products in the solid waste mineralization product chamber 301 upward out of the container opening; use a sample shovel to completely collect the mineralized products to obtain a structurally intact undisturbed mineralized sample for subsequent XRD, SEM, thermogravimetric analysis, and other tests.

[0045] Comparative verification: A comparative experiment was conducted using a traditional high-pressure reactor with the same proportions and temperature and pressure conditions: Three solid waste suspensions were directly added to the reactor and stirred for 5 minutes. CO2 was introduced to 2 MPa and reacted at 50°C for 24 hours. After the reaction was completed, the bottom product was scraped off.

[0046] The comparative results show that the mineralized products obtained by the device of the present invention are integrally formed and structurally intact, with no damage to the internal pores and mineral distribution; while the products obtained by the traditional scraping method are fragmented and scattered, with severe damage to the microstructure. Furthermore, the solid waste proportioning error of the device of the present invention is ≤1%, significantly better than the proportioning error of traditional manual feeding (≥5%), and the experimental parallelism and data accuracy are greatly improved.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-element solid waste synergistic CO2 mineralization simulation experimental device, characterized in that, It includes a multi-component solid waste injection control system, a CO2 injection and pressure control system, a data acquisition system, a multi-component solid waste mixing system, and a solid waste mineralization simulation sampling system; The multi-component solid waste injection control system includes a nitrogen cylinder, at least two sets of solid waste suspension containers, and a mass flow meter corresponding to each solid waste suspension container. The nitrogen cylinder is connected to the inlet end of each solid waste suspension container via a pipeline, which is then connected to a pressure reducing valve, a gas valve, and a first gas pressure controller. The outlet end of each solid waste suspension container is connected to the multi-component solid waste mixing system via the corresponding mass flow meter. The multi-component solid waste mixing system includes a mixing container and a vibrating table. The mixing container is sealed and placed on the vibrating table. The top of the mixing container is provided with a feed inlet, a first exhaust port and a gas pressure injection port. The feed inlet is connected to the liquid outlet of the multi-component solid waste injection control system, and the gas pressure injection port is connected to the gas outlet branch of the nitrogen cylinder. The solid waste mineralization simulation sampling system includes a mineralization reaction container and a constant temperature oil bath. The mineralization reaction container is placed inside the constant temperature oil bath. The interior of the mineralization reaction container is equipped with a movable sealing plate that can slide and seal against the inner wall of the container. The movable sealing plate divides the internal space of the mineralization reaction container into an upper solid waste mineralization product cavity and a lower water cavity. The bottom of the mineralization reaction container is equipped with a water injection hole that communicates with the water cavity. The discharge port of the mixing container is connected to the feed end of the solid waste mineralization product cavity through a pipeline. The CO2 injection and pressure control system includes a CO2 cylinder, which is connected to the air inlet of the solid waste mineralization product cavity after passing through a pressure reducing valve, a gas valve, and a second pressure controller. The data acquisition system is connected to the signals of each mass flow meter, the first pressure controller, the second pressure controller, and the constant temperature oil bath, and is used to collect and control experimental parameters in real time.

2. The apparatus according to claim 1, characterized in that, Each solid waste suspension container is equipped with a stirrer to continuously agitate and maintain the uniform suspension state of the solid waste suspension.

3. The apparatus according to claim 1, characterized in that, The top of the mixing container is provided with a first sealing cover, and the feed inlet, the first exhaust port and the air pressure injection port are all opened on the first sealing cover. A first exhaust valve is installed at the first exhaust port.

4. The apparatus according to claim 1, characterized in that, The top of the mineralization reaction vessel is provided with a second sealing cover. The feed end, air inlet end and second exhaust port of the solid waste mineralization product cavity are all located on the second sealing cover. A second exhaust valve is installed at the second exhaust port.

5. The apparatus according to claim 1, characterized in that, The connecting pipeline between the mixing container and the mineralization reaction container is equipped with a multi-component solid waste outflow valve and a multi-component solid waste inflow valve in sequence.

6. The apparatus according to claim 1, characterized in that, The solid waste suspension containers are provided in three sets, which are used to hold fly ash suspension, coal gangue suspension and steel slag suspension respectively.

7. A method for conducting a simulation experiment on the synergistic CO2 mineralization of multiple solid wastes using the apparatus described in claim 1, characterized in that, Includes the following steps: S1. System inertization pretreatment: Open the nitrogen cylinder and purge the mixing container and mineralization reaction container with nitrogen gas respectively. After the air in the container is discharged, close all exhaust passages. S2. Constant temperature environment preset: Turn on the constant temperature oil bath, set the target experimental temperature, so that the mineralization reaction vessel is heated as a whole and maintained at a constant temperature. S3. Precise feeding and mixing of multiple solid wastes: The target injection volume of the corresponding solid waste suspension is set by each mass flow meter, and the outlet valve of each solid waste suspension is opened. Nitrogen gas is used to push each group of solid waste suspensions into the mixing container. After feeding is completed, close the feed valve and the first exhaust valve, turn on the vibrating table, and shake and mix the multi-component solid waste suspension in the mixing container. S4. Constant pressure mineralization reaction: After mixing, nitrogen is used to push all the multi-component solid waste suspension in the mixing container into the solid waste mineralization product cavity of the mineralization reaction container; the material conveying passage is closed, the CO2 injection and pressure control system is turned on, CO2 is introduced into the solid waste mineralization product cavity and regulated to the target mineralization pressure by the second pressure controller, and the mineralization reaction is carried out under the preset temperature and pressure conditions. S5. Non-destructive sampling of undisturbed products: After the reaction is completed, the CO2 gas source is turned off and the pressure in the mineralization reaction container is slowly released. The second sealing cover is opened, and clean water is injected into the water cavity at a constant speed through the bottom water injection hole. The water pressure pushes the movable sealing plate to move upward and push the undisturbed mineralization products in the solid waste mineralization product cavity out of the container as a whole, thus completing the sampling.

8. The method according to claim 7, characterized in that, In step S3, the oscillation frequency of the vibration table is 100~300 r / min, and the mixing time is 5~30 min.

9. The method according to claim 7, characterized in that, In step S4, the temperature range of the mineralization reaction is 20~80℃, and the mineralization pressure range is 0.1~5MPa.

10. The method according to claim 7, characterized in that, In step S1, the nitrogen purging time is 3~10 min and the purging pressure is 0.1~0.3 MPa.

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