Fluidized bed and method for capturing carbon dioxide in mineralized industrial waste gas

Abstract

The invention provides a fluidized bed and method for capturing carbon dioxide in mineralized industrial waste gas, and relates to the field of carbon dioxide mineralization. According to the method, purified carbon dioxide is divided into two branches, one branch is used for mixing concrete raw materials, and the other branch is used for ventilating mixed concrete; a mixing mechanism is arranged, carbon dioxide gas and water are mixed firstly, and then liquid in which carbon dioxide is dissolved is mixed with concrete aggregate; a fluidized bed is arranged and used for ventilating the mixed concrete, the inlet end of the fluidized bed is connected with the input mixed concrete, and the concrete mixed with carbon dioxide is discharged from the outlet end of the fluidized bed. According to the method for capturing the carbon dioxide in the mineralization industrial waste gas, the carbon dioxide is introduced into the concrete in two times, the use amount of the carbon dioxide in the mineralization process is increased, especially the step of dissolving the carbon dioxide in water is increased, the use amount of the carbon dioxide is increased, and mineralization of the carbon dioxide is better achieved.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide mineralization, specifically to a fluidized bed and method for capturing carbon dioxide from waste gas in the mineralization industry. Background Technology

[0002] Concrete mineralization of carbon dioxide is an innovative and effective method for capturing carbon dioxide from industrial waste gas. Specifically, this process involves introducing carbon dioxide from industrial waste gas into a fluidized bed containing concrete with a specific mix ratio. The carbon dioxide then reacts chemically with the mineral components in the concrete, thereby achieving carbon dioxide mineralization and fixation. This method not only efficiently captures and converts carbon dioxide, reducing its emissions into the atmosphere, but also improves the performance of concrete to some extent, increasing its strength and durability.

[0003] Existing patent CN114426419B describes a method for sealing carbon dioxide in inorganic solid waste ceramsite mineralized concrete. The method includes the following steps: preparing inorganic solid waste ceramsite filter balls; preparing aminated ceramsite filter balls; obtaining saturated carbon dioxide filter balls after the aminated ceramsite filter balls fully absorb carbon dioxide; and mixing the saturated carbon dioxide filter balls with cement mortar concrete to form mineralized lightweight concrete specimens. This invention treats inorganic solid waste ceramsite filter balls with amino acid salt solution and / or amino ionic liquid, then introduces them into a high-concentration CO2 environment such as factory chimney gas to adsorb saturated CO2. These saturated CO2 particles are then directly added to concrete as an additive. During cement mixing, hydration heat, or steam curing, the released CO2 rapidly mineralizes the curing cementitious material, converting it into calcium carbonate, the main component of concrete, thus achieving CO2 conversion and sealing. However, this technical solution involves first adsorbing carbon dioxide into the ceramsite filter balls, then mixing the ceramsite filter balls into the concrete aggregate. Other aggregates capable of adsorbing carbon dioxide are not adsorbed, resulting in low carbon dioxide utilization. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a fluidized bed and method for capturing carbon dioxide from waste gas in the mineralization industry, thus solving the problem of low carbon dioxide utilization rate mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for capturing carbon dioxide in waste gas from mineralizing industries, comprising the following steps: S1. The purified carbon dioxide is divided into two branches. One branch is used for mixing concrete raw materials, and the other branch is used for ventilating the mixed concrete. S2. Set up a mixing mechanism to first mix carbon dioxide gas with water, and then mix the liquid containing dissolved carbon dioxide with concrete aggregate. S3. Set up a fluidized bed to aerate the mixed concrete. The inlet end of the fluidized bed is connected to the input of the mixed concrete, and the outlet end of the fluidized bed discharges the concrete mixed with carbon dioxide. S4. Discharge the concrete injected with carbon dioxide from the fluidized bed and set up an exhaust gas collection device to collect excess carbon dioxide.

[0006] Preferably, S2 includes the following steps: S21. Set up a high-pressure, low-temperature environment to mix carbon dioxide gas with water; S22. The water that dissolves carbon dioxide gas is first initially mixed with the concrete aggregate to form a water film that coats the particles. Then, the water film coated particles in the fluidized bed are transported to replenish the remaining water in the mix.

[0007] A fluidized bed for capturing carbon dioxide in waste gas from a mineral processing industry includes a box body with an inlet and an outlet on both sides of the bottom end of the box body. A flow channel communicating with the inlet and outlet is provided inside the box body. A partition, closed at the top and open at the bottom, divides the box body into multiple chambers. Each chamber is connected to a flow channel. Each chamber is equipped with an inlet pipe inserted into the flow channel and an exhaust pipe connected to the next chamber and inserted into the flow channel. The exhaust pipe of the last chamber is connected to a waste gas collection device.

[0008] Preferably, the flow channel is inclined, with the inlet side higher than the outlet side, and the baffle is parallel to the inner bottom wall of the flow channel.

[0009] Preferably, both the air inlet pipe and the air outlet pipe are provided with nozzles pointing towards the outlet of the flow channel.

[0010] Preferably, the nozzle is conical in shape, with its end face located at the outlet side of the flow channel. The nozzle is provided with nozzle holes pointing towards the outlet side of the flow channel. The surfaces of the air inlet pipe and the exhaust pipe located inside the flow channel are provided with nozzle holes. The outer surfaces of the air inlet pipe and the exhaust pipe are slidably connected to a sleeve that slides down to cover the nozzle holes of the air inlet pipe and the exhaust pipe, and a drive unit for driving the sleeve to move up and down.

[0011] Preferably, the flow channel is provided with an auger rotating mechanism. The air outlet of the air inlet pipe and the air outlet of the exhaust pipe are both divided into a fixed section and a sliding section that extends and retracts on the outer surface of the fixed section. The sliding section is controlled by the control unit to move up and down with the edge of the auger rotating mechanism.

[0012] Preferably, the auger rotating mechanism is divided into two groups, with the air intake pipe and exhaust pipe both located between the two groups of auger rotating mechanisms.

[0013] Preferably, the mixing mechanism includes a container for holding water, a refrigeration unit is provided on the outer ring of the container, control valves are provided at both the water inlet and outlet of the container, a constant pressure exhaust valve is provided in the container, the constant pressure exhaust valve is connected to the exhaust gas collection device, one water outlet of the container is connected to and passes through a feeding chamber for quantitatively dispensing concrete aggregate, the feeding chamber is injected into the box body by a pump, and the other water outlet of the container is connected to the connection between the pump and the box body.

[0014] Preferably, the outlet end of the housing is connected to and passes through a concrete mold via a flexible hose, and an exhaust pipe for connecting the exhaust gas collection device is provided above the concrete mold.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This method for capturing carbon dioxide in waste gas from the mineralization industry increases the use of carbon dioxide in the mineralization process by introducing carbon dioxide into the concrete in two stages. In particular, it adds a step of dissolving carbon dioxide in water, thereby increasing the amount of carbon dioxide used and better realizing the mineralization of carbon dioxide.

[0016] 2. The method for capturing carbon dioxide in the waste gas of the mineralization industry improves the solubility of carbon dioxide by setting up a refrigeration unit to cool the container during the carbon dioxide dissolution process, and divides the mixing process with concrete aggregate into two steps to reduce the carbon dioxide overflow caused by stirring, thereby achieving better mineralization of carbon dioxide.

[0017] 3. The fluidized bed for capturing carbon dioxide in the chemical industry waste gas has a conical nozzle with its end face located at the outlet side of the flow channel. The nozzle is equipped with spray holes pointing towards the outlet side of the flow channel. This design can reduce the resistance when concrete flows. The surfaces of the air inlet pipe and the air outlet pipe located inside the flow channel are equipped with spray holes. The outer surfaces of the air inlet pipe and the air outlet pipe are slidably connected to a sleeve that slides down to cover the spray holes of the air inlet pipe and the air outlet pipe, as well as a drive unit that drives the sleeve to move up and down. When material needs to be discharged, the drive unit drives the sleeve to move downward so that only the spray holes corresponding to the nozzles work, which can increase the force of pushing the concrete flow outward.

[0018] 4. The fluidized bed for capturing carbon dioxide in the chemical industry waste gas has an auger rotating mechanism inside the flow channel. The outlet ends of the inlet pipe and the outlet pipe are divided into a fixed section and a sliding section that extends and retracts on the outer surface of the fixed section. The sliding section is controlled by the control unit to move up and down with the edge of the auger rotating mechanism. With this setting, the auger rotating mechanism is used to push and stir the concrete, and the gas is controlled to be introduced into the concrete during the rotation of the auger.

[0019] 5. The fluidized bed for capturing carbon dioxide in chemical industrial waste gas has an inlet pipe inserted into the flow channel in each chamber and an exhaust pipe connected to the next chamber and inserted into the flow channel. The exhaust pipe of the last chamber is connected to the exhaust gas collection device. This optimizes the ventilation and sequence, improves the gas utilization rate, and allows for the replenishment of new gas in each chamber, as well as the injection of unused gas from the previous chamber into the current chamber. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial sectional view of the housing of the present invention; Figure 3 This is a schematic diagram showing the connection between the intake pipe and the exhaust pipe of the present invention; Figure 4 This is a schematic diagram of the nozzle connection of the present invention; Figure 5 This is a schematic diagram of the hybrid mechanism of the present invention; Figure 6 This is a schematic diagram of the container connection of the present invention; Figure 7 This is a schematic diagram of the concrete mold of the present invention; Figure 8 This is a schematic diagram of the auger rotating mechanism of the present invention.

[0021] In the diagram: 1. Box body; 2. Flow channel; 3. Baffle plate; 4. Air inlet pipe; 5. Exhaust pipe; 6. Nozzle; 7. Spray hole; 14. Sleeve; 8. Drive unit; 9. Mixing mechanism; 51. Fixed section; 52. Sliding section; 10. Control unit; 11. Screw auger rotation mechanism; 12. Concrete mold; 13. Exhaust pipe; 901. Container; 902. Control valve; 903. Constant pressure exhaust valve; 904. Dispensing chamber; 905. Pump; 906. Refrigeration unit. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of 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.

[0023] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0024] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] Furthermore, the use of terms such as "first" and "second" in this application is 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0026] like Figures 1-8 As shown, a fluidized bed for capturing carbon dioxide in waste gas from a mineralizing industry is described. The fluidized bed includes a box 1 with an inlet and an outlet on both sides of the bottom. A circular flow channel 2, connected to the inlet and outlet, is installed inside the box 1. A partition 3, closed at the top and open at the bottom, divides the box 1 into multiple chambers. The injected concrete covers the lower edge of the partition 3, making each chamber relatively independent. Each chamber is connected to the flow channel 2 and has an inlet pipe 4 inserted into the flow channel 2, and an exhaust pipe 5 connected to the next chamber and inserted into the flow channel 2. The exhaust pipe 5 of the last chamber is connected to a tail gas collection device. This optimizes ventilation and sequence, improves gas utilization, and allows for the replenishment of new gas in each chamber, while also injecting unused gas from the previous chamber into that chamber.

[0027] The flow channel 2 is inclined, with the inlet side higher than the outlet side. Valves are installed at both the outlet and inlet of the flow channel 2. When the valves are closed, the box 1 becomes a closed space. The partition 3 is parallel to the inner bottom wall of the flow channel 2. This arrangement enables the concrete to flow by gravity.

[0028] In the second embodiment, both the air inlet pipe 4 and the air outlet pipe 5 are equipped with nozzles 6 pointing towards the outlet of the flow channel 2. The air sprayed outward through the nozzles 6 can accelerate the flow of concrete.

[0029] Furthermore, the nozzle 6 is conical in shape, with its end face located at the outlet side of the flow channel 2. The nozzle 6 is provided with nozzle holes 7 pointing towards the outlet side of the flow channel 2. This arrangement can reduce the resistance when concrete flows. The air inlet pipe 4 and the exhaust pipe 5 are provided with nozzle holes 7 on their surfaces inside the flow channel 2. The nozzle holes 7 are larger inside and smaller outside to maintain ventilation and prevent concrete from entering the nozzle holes 7. The outer surfaces of the air inlet pipe 4 and the exhaust pipe 5 are slidably connected to a sleeve 14 that slides down to cover the nozzle holes 7 of the air inlet pipe 4 and the exhaust pipe 5, as well as a drive unit 8 that drives the sleeve 14 to move up and down. When discharge is required, the drive unit 8 drives the sleeve 14 to move downward so that only the nozzle hole 7 corresponding to the nozzle 6 works, which can increase the force of pushing the concrete flow outward.

[0030] In embodiment 3, an auger rotating mechanism 11 is provided inside the flow channel 2. The auger rotating mechanism 11 includes at least a central shaft, support rings at both ends, and an auger section between the two support rings. The power part is connected to the central shaft by an external gear ring. The middle part of the external gear ring and the support ring can be set to a hollow state by a crossbeam. The air outlet of the air inlet pipe 4 and the air outlet of the exhaust pipe 5 are divided into a fixed section 51 and a sliding section 52 that is sleeved on the outer surface of the fixed section 51 and extends and retracts vertically. The sliding section 52 is controlled by the control unit 10 to move up and down with the edge of the auger rotating mechanism 11. With this setting, the auger rotating mechanism 11 is used to push and stir the concrete, and the gas is controlled to enter the concrete during the rotation of the auger.

[0031] In Example 4, the design of the mixing mechanism 9 further improves the efficiency of carbon dioxide dissolution and concrete mixing. The container 901, used to hold water, is made of high-strength, corrosion-resistant material, ensuring it will not be damaged by water quality or carbon dioxide corrosion during long-term use. A cooling unit 906, located around the outer ring of container 901, precisely cools the container 901 during carbon dioxide dissolution, effectively increasing the solubility of carbon dioxide and allowing more carbon dioxide to dissolve in the water, thereby enhancing the subsequent mineralization reaction. Control valves 902 at the water inlet and outlet of container 901 precisely control the water flow rate, ensuring the stability of the mixing process. A constant-pressure exhaust valve 903 promptly discharges excess gas generated by carbon dioxide dissolution within container 901, preventing excessive pressure inside the container. This discharged gas is guided to a tail gas collection device, preventing gas leakage and waste or environmental pollution. The quantitative concrete aggregate dispensing chamber 904, in conjunction with pump 905, accurately injects the initial concrete mix into the tank 1 according to a preset ratio, ensuring uniform concrete composition in each mix. The other outlet of container 901 is connected to the connection between pump 905 and tank 1. This design makes the entire mixing process smoother and reduces the possibility of material loss or uneven mixing in the intermediate links.

[0032] In embodiment four, the auger rotating mechanism 11 is divided into two groups, with the intake pipe 4 and exhaust pipe 5 both located between the two groups of auger rotating mechanisms 11. This arrangement allows the intake pipe 4 and exhaust pipe 5 to remain stationary.

[0033] When the two sets of auger rotating mechanisms 11 are in operation, they form a relatively stable material flow zone. The air inlet pipe 4 and the exhaust pipe 5 are located in the middle of this zone, allowing gas to be stably introduced into the concrete. The gas, aided by the material circulation and disturbance created by the operation of the two sets of auger rotating mechanisms 11, is more evenly dispersed within the concrete. Even without the need for the air inlet pipe 4 and the exhaust pipe 5 to move themselves, the gas and concrete can still be effectively mixed thoroughly, improving overall processing efficiency and ensuring the processing quality of the concrete in the fluidized bed.

[0034] Furthermore, the mixing mechanism 9 includes a container 901 for holding water. A refrigeration unit 906 is provided on the outer ring of the container 901 to increase the volume of carbon dioxide by lowering the temperature. The container 901 is equipped with control valves 902 at both the inlet and outlet ends of the water. The container 901 is also equipped with a constant pressure exhaust valve 903, which is connected to the exhaust gas collection device. One outlet end of the container 901 is connected to and passes through a feeding chamber 904 for quantitatively dispensing concrete aggregate. There are various methods for quantitatively dispensing concrete aggregate, such as quantitative dispensing by a belt scale or dispensing by a feeding hopper at the bottom of a fixed volume cavity. It should be noted that this part adopts a direct connection method, using the gravity of water to achieve flow and avoid stirring. The surface of the pipe at the outlet end located in the feeding chamber 904 is provided with a through hole. The feeding chamber 904 injects the initially mixed concrete into the box 1 through a pump 905. The other outlet end of the container 901 is connected to the connection between the pump 905 and the box 1.

[0035] This design achieves highly efficient mixing of carbon dioxide and concrete materials by precisely controlling the water temperature and flow rate, combined with the quantitative addition of concrete aggregate. The refrigeration unit 906 not only improves the dissolution efficiency of carbon dioxide but also controls the reaction rate during the mixing process by adjusting the temperature. The precise operation of the control valve 902 ensures that water and concrete aggregate are mixed in a predetermined ratio, avoiding uneven mixing caused by imbalances. The constant-pressure exhaust valve 903 ensures stable gas pressure during mixing, preventing adverse effects from pressure fluctuations. Simultaneously, the direct connection method utilizes the gravity of water for flow, avoiding the energy consumption and wear issues that may arise from traditional mixing methods, thus improving the stability and durability of the entire system.

[0036] Furthermore, the outlet end of the housing 1 is connected to the concrete mold 12 via a flexible hose, and an exhaust pipe 13 for connecting the exhaust gas collection device is provided above the concrete mold 12. Since gas will enter the mold during the pouring process, an exhaust pipe 13 is provided to discharge exhaust gas in order to ensure that the concrete can fully fill the mold.

[0037] Its working principle includes: S1. The purified carbon dioxide is divided into two branches. One branch is used for mixing concrete raw materials, and the other branch is used for ventilating the mixed concrete. S2. Set up a mixing mechanism 9 to first mix carbon dioxide gas with water, and then mix the liquid containing dissolved carbon dioxide with concrete aggregate. S21. Set up a high-pressure, low-temperature environment to mix carbon dioxide gas with water; S22. The water that dissolves carbon dioxide gas is first initially mixed with the concrete aggregate to form a water film that coats the particles. Then, the water film coated particles in the fluidized bed are transported to replenish the remaining water in the mix.

[0038] S3. Set up a fluidized bed to aerate the mixed concrete. The inlet end of the fluidized bed is connected to the input of the mixed concrete, and the outlet end of the fluidized bed discharges the concrete mixed with carbon dioxide. S4. Discharge the concrete injected with carbon dioxide from the fluidized bed and set up an exhaust gas collection device to collect excess carbon dioxide.

[0039] In practical applications, the fluidized bed method for capturing carbon dioxide from industrial waste gas in this mineralization process has demonstrated significant advantages. Firstly, by introducing carbon dioxide into the concrete in two stages, the amount of carbon dioxide used in the mineralization process is greatly increased. Especially in the step of dissolving carbon dioxide in water, the cooling effect of the refrigeration unit 906 further improves the solubility of carbon dioxide, allowing more carbon dioxide to participate in the subsequent mineralization reaction, thus achieving better capture and mineralization. Secondly, the two-step mixing method during the mixing of dissolved carbon dioxide with concrete aggregates effectively reduces carbon dioxide overflow caused by stirring. This step-by-step mixing method allows carbon dioxide to come into more complete contact with the concrete aggregates and react, improving the efficiency and effectiveness of the mineralization reaction.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0041] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are 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.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for capturing carbon dioxide in waste gas from the mineral processing industry, characterized in that: Includes the following steps: S1. The purified carbon dioxide is divided into two branches. One branch is used for mixing concrete raw materials, and the other branch is used for ventilating the mixed concrete. S2. Set up a mixing mechanism (9), first mix carbon dioxide gas with water, and then mix the liquid containing dissolved carbon dioxide with concrete aggregate; S3. Set up a fluidized bed to aerate the mixed concrete. The inlet end of the fluidized bed is connected to the input of the mixed concrete, and the outlet end of the fluidized bed discharges the concrete mixed with carbon dioxide. S4. Discharge the concrete injected with carbon dioxide from the fluidized bed and set up an exhaust gas collection device to collect excess carbon dioxide.

2. The method for capturing carbon dioxide in waste gas from the mineral processing industry according to claim 1, characterized in that: S2 includes the following steps: S21. Set up a high-pressure, low-temperature environment to mix carbon dioxide gas with water; S22. The water that dissolves carbon dioxide gas is first initially mixed with the concrete aggregate to form a water film that coats the particles. Then, the water film coated particles in the fluidized bed are transported to replenish the remaining water in the mix.

3. A fluidized bed for capturing carbon dioxide from waste gas in the mineral processing industry, characterized in that: The fluidized bed includes a box (1), with an inlet and an outlet on both sides of the bottom end of the box (1). The box (1) is provided with a flow channel (2) that communicates with the inlet and outlet. The box (1) is provided with a partition (3) that is closed at the top and open at the bottom. The partition (3) divides the box (1) into multiple cavities. Each cavity is connected to the flow channel (2). Each cavity is provided with an air inlet pipe (4) that is inserted into the flow channel (2) and an exhaust pipe (5) that is connected to the next cavity and inserted into the flow channel (2). The exhaust pipe (5) of the last cavity is connected to the exhaust gas collection device.

4. The fluidized bed for capturing carbon dioxide in waste gas from the mineral processing industry according to claim 3, characterized in that: The flow channel (2) is inclined, with the inlet side higher than the outlet side, and the baffle (3) is parallel to the inner bottom wall of the flow channel (2).

5. The fluidized bed for capturing carbon dioxide in waste gas from mineral processing industries according to claim 3 or 4, characterized in that: Both the air inlet pipe (4) and the air outlet pipe (5) are equipped with nozzles (6) pointing to the outlet of the flow channel (2).

6. The fluidized bed for capturing carbon dioxide from waste gas in the mineral processing industry according to claim 5, characterized in that: The nozzle (6) is conical in shape, with its end face located at the outlet side of the flow channel (2). The nozzle (6) is provided with nozzle holes (7) pointing towards the outlet side of the flow channel (2). The surfaces of the air inlet pipe (4) and the exhaust pipe (5) located inside the flow channel (2) are provided with nozzle holes (7). The outer surfaces of the air inlet pipe (4) and the exhaust pipe (5) are slidably connected to a sleeve (14) that slides down to cover the nozzle holes (7) of the air inlet pipe (4) and the exhaust pipe (5), and a drive unit (8) that drives the sleeve (14) to move up and down.

7. The fluidized bed for capturing carbon dioxide from waste gas in the mineral processing industry according to claim 3 or 4, characterized in that: The flow channel (2) is equipped with a screw conveyor rotating mechanism (11). The air outlets of the air inlet pipe (4) and the exhaust pipe (5) are divided into a fixed section (51) and a sliding section (52) that extends and retracts on the outer surface of the fixed section (51). The sliding section (52) is controlled by the control unit (10) to move up and down along the edge of the screw conveyor rotating mechanism (11).

8. The fluidized bed for capturing carbon dioxide in waste gas from the mineral processing industry according to claim 7, characterized in that: The auger rotating mechanism (11) is divided into two groups, with the air inlet pipe (4) and the exhaust pipe (5) both located between the two groups of auger rotating mechanisms (11).

9. The fluidized bed for capturing carbon dioxide in waste gas from mineral processing industries according to claim 6 or 8, characterized in that: The mixing mechanism (9) includes a container (901) for holding water. A refrigeration unit (906) is provided on the outer ring of the container (901). A control valve (902) is provided at both the inlet and outlet of the water in the container (901). A constant pressure exhaust valve (903) is provided in the container (901). The constant pressure exhaust valve (903) is connected to the exhaust gas collection device. One outlet of the container (901) is connected to and passes through a feeding chamber (904) for quantitatively feeding concrete aggregate. The feeding chamber (904) injects the initial concrete into the box (1) through a pump (905). The other outlet of the container (901) is connected to the connection between the pump (905) and the box (1).

10. The fluidized bed for capturing carbon dioxide from waste gas in the mineral processing industry according to claim 9, characterized in that: The outlet end of the box (1) is connected to and penetrates a concrete mold (12) via a flexible hose, and an exhaust pipe (13) for connecting the exhaust gas collection device is provided above the concrete mold (12).

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