Civil engineering solid waste recycled aggregate preparation system based on multistage separation

Abstract

The invention relates to the technical field of civil engineering, and discloses a civil engineering solid waste recycled aggregate preparation system based on multistage separation, which comprises a coarse separation unit, an impurity removal unit, a cleaning unit, a collection unit, a center unit, a carbon sequestration unit and a collection unit, the coarse sorting unit is used for sorting solid waste, the impurity removal unit is used for removing impurities from the solid waste treated by the coarse sorting unit, the cleaning unit is used for cleaning the solid waste subjected to impurity removal, the collecting unit is used for collecting working data of the coarse sorting unit, the impurity removal unit and the cleaning unit, and the carbon sequestration unit is used for sequestration of carbon in the coarse sorting unit to form recycled aggregate; the solid waste is crushed and then sorted, so that the solid waste is separated according to different particle diameters, noise damage to equipment due to different sizes is avoided, the impurity rate of the finally generated solid waste is low, carbon sequestration treatment is carried out, carbon dioxide is absorbed, and the effect of protecting the environment is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and more particularly to a preparation system for recycled aggregates of civil engineering solid waste based on multi-stage separation. Background Art

[0002] Recycled aggregates of civil engineering solid waste refer to artificial aggregates that can replace natural sand and gravel obtained by physically or chemically crushing, separating, cleaning, and strengthening waste materials generated from civil engineering such as buildings, roads, and bridges. Recycled aggregates of civil engineering solid waste belong to a kind of resource-recycled material and are widely used in fields such as concrete, subgrade filling, and building materials products; Recycled aggregates of civil engineering solid waste come from waste removal, excess construction waste generated during new construction projects, and construction waste generated after disasters. When recycling them, they need to be pretreated by manual or mechanical sorting, and then crushed after pretreatment, sorted after crushing, and the sorted solid waste is recycled after sorting; Nowadays, when preparing recycled aggregates of civil engineering solid waste, due to the complexity of civil engineering solid waste, the current separation efficiency is low and the quality of the aggregates fluctuates greatly. The existing technologies mostly use single-stage crushing and screening, which are difficult to accurately separate impurities and control the aggregate gradation, and lack a real-time quality feedback mechanism and cannot be adjusted in time. As a result, the quality of the recycled aggregates is poor, and the carbon capture and storage technology is not effectively combined during the solid waste recycling process, resulting in a high carbon footprint during the resource recycling process. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a preparation system for recycled aggregates of civil engineering solid waste based on multi-stage separation to solve the technical problems proposed in the background art.

[0004] To achieve the above object, the present invention provides the following technical solution: A preparation system for recycled aggregates of civil engineering solid waste based on multi-stage separation, comprising a coarse separation unit, an impurity removal unit, a cleaning unit, a collection unit, a central unit, a carbon sequestration unit, and a collection unit. The coarse separation unit is used for crushing and primary separation of solid waste. The impurity removal unit removes impurities from the solid waste processed by the coarse separation unit. The cleaning unit is used for cleaning the solid waste after impurity removal. The collection unit is used for collecting the working data during the operation of the coarse separation unit, the impurity removal unit, and the cleaning unit. The central unit is used for controlling all units. The carbon sequestration unit is used for carbon sequestration in the coarse separation unit. The collection unit collects the processed solid waste to form recycled aggregates; The coarse separation unit includes a crushing module and a separation module. The crushing module uses a jaw crusher to coarsely crush the waste to a diameter within 100 mm. The separation module passes the coarsely crushed solid waste through two layers of sieve meshes. The aperture of the first layer of sieve mesh is 20 mm, and the aperture of the second layer of sieve mesh is 5 mm. The solid waste that fails to pass through the first layer of sieve mesh is returned to the jaw crusher for further crushing. The solid waste that passes through the first layer of sieve mesh is screened by the second layer of sieve mesh. The large-diameter solid waste that fails to pass through the second layer of sieve mesh and the finely crushed solid waste that passes through the second layer of sieve mesh are separately sent into the impurity removal unit.

[0005] In a preferred embodiment, the acquisition unit acquires the first load data information FZ1 received during the screening of the first layer of sieve mesh in the separation module and the second load data information FZ2 received during the screening of the second layer of sieve mesh, and the acquisition unit sends the acquired first load data information FZ1 and second load data information FZ2 to the central unit. The central unit receives the first load data information FZ1 and second load data information FZ2 and compares them with the first load upper threshold FS1, first load lower threshold FX1, second load upper threshold FS2, and second load lower threshold FX2 inside it.

[0006] In a preferred embodiment, when the first load data information FZ1 ≥ the first load threshold FY1, the central unit increases the vibration frequency and tilt angle during the screening of the first layer of sieve mesh until the first load data information FZ1 < the first load threshold FY1, and then stops the adjustment. When the first load data information FZ1 ≤ the first load lower threshold FX1, the central unit decreases the vibration frequency and tilt angle during the screening of the first layer of sieve mesh until the first load data information FZ1 > the first load lower threshold FX1.

[0007] In a preferred embodiment, when the second load data information FZ2 ≥ the second load threshold FY2, the central unit increases the vibration frequency and tilt angle during the screening of the second layer of sieve mesh until the second load data information FZ2 < the second load threshold FY2, and then stops the adjustment. When the second load data information FZ2 ≤ the second load lower threshold FX2, the central unit decreases the vibration frequency and tilt angle during the screening of the second layer of sieve mesh until the second load data information FZ2 > the second load lower threshold FX2.

[0008] In a preferred embodiment, the impurity removal unit includes a heavy metal module, a light metal module, and a light impurity module. The heavy metal module uses a magnetic separator to separately separate the heavy metals in the large-diameter solid waste and the finely crushed solid waste. The light metal module uses eddy current separation to remove the light metals in the large-diameter solid waste and the finely crushed solid waste. The light impurity module uses a flotation cell to remove the light impurities in the large-diameter solid waste and the finely crushed solid waste.

[0009] In a preferred embodiment, the cleaning unit adopts a water jet impact device to wash away the impurity attachments adhered to the surfaces of large-diameter solid waste and finely crushed solid waste. Before the cleaning unit operates, the acquisition unit acquires the average hardness data YD, average particle size data LD, and the nozzle area data MJ of all the solid waste fed into the cleaning unit.

[0010] In a preferred embodiment, the acquisition unit sends the acquired data information to the central unit. The central unit receives the acquired data information and calculates the water jet power value P. The calculation formula for the water jet power value P is , where BZ is the working frequency of the water jet impact device under standard conditions, C1 is the hardness correlation coefficient, k2 is the particle size correlation coefficient, k3 is the area correlation coefficient. The central unit controls the operation of the water jet impact device using the calculated water jet power value P.

[0011] In a preferred embodiment, the carbon sequestration unit injects carbon dioxide gas when the coarse separation unit performs crushing. And when the acquisition unit acquires the data information of the temperature WD, humidity SD, and carbon dioxide concentration ND during the operation in the crushing module when the carbon sequestration unit injects carbon dioxide, the acquisition unit sends the acquired data to the central unit.

[0012] In a preferred embodiment, the central unit receives the acquired data and calculates the carbon dioxide injection amount ZR. The calculation formula for the carbon dioxide injection amount ZR is , where k1 and k2 are both weights, and ND is the standard carbon dioxide concentration most suitable for carbon sequestration. The central unit controls the amount of carbon dioxide introduced during carbon sequestration by the carbon sequestration unit using the calculated carbon dioxide injection amount ZR.

[0013] The technical effects and advantages of the present invention: After the coarse separation unit crushes the solid waste and then separates it, the present invention enables the solid waste to be separated according to different particle diameters. Therefore, during subsequent processing, different powers and the sizes of processing equipment can be adopted according to different diameters, avoiding equipment noise damage due to different sizes. Finally, the impurity content in the generated solid waste is relatively low, and carbon sequestration treatment is carried out to absorb carbon dioxide, achieving the effect of environmental protection; In the impurity removal unit of the present invention, the heavy metal module removes metals that can be magnetically attracted, the light metal module removes metals that cannot be magnetically attracted by using eddy current separation, and the light quality module removes some lighter impurities such as plastics, foams, and woods. The present application adopts different removal methods for different impurities, thereby ensuring that the impurities contained in the solid waste after treatment are relatively low; When the cleaning unit of the present invention uses a water jet impact device for flushing, it collects the average hardness data YD, the average particle size data LD, and the nozzle area data MJ of the water jet device. When the average hardness data YD and the average particle size data LD are large, the power is increased. When the nozzle area data MJ of the water jet device is large, the power is increased, so that the water jet impact device of the present application is more suitable for the size of the solid waste during cleaning, ensuring that the surface of the solid waste is cleaned while ensuring the integrity of the solid waste. When the present invention performs crushing, carbon dioxide gas is injected and absorbed, thereby protecting the environment. It can fill the gaps of the solid waste, reduce the water absorption rate of the solid waste, improve the frost resistance and chloride ion erosion resistance, and the calcium carbonate formed by the absorption of carbon dioxide is inert in chemical properties, thereby reducing the risk of volume expansion of the aggregate in an alkaline environment. Brief Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the overall system composition of the present invention. Detailed Embodiments

[0015] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the drawings in the present invention. In addition, the forms of each structure described in the following embodiments are only examples. A civil engineering solid waste recycled aggregate preparation system based on multi-stage sorting involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0016] Referring to Figure 1 , the present invention provides a civil engineering solid waste recycled aggregate preparation system based on multi-stage sorting, including a coarse sorting unit, an impurity removal unit, a cleaning unit, a collection unit, a central unit, a carbon sequestration unit, and a collection unit. The coarse sorting unit is used for crushing and primary sorting of solid waste. The impurity removal unit removes impurities from the solid waste processed by the coarse sorting unit. The cleaning unit is used for cleaning the solid waste after impurity removal. The collection unit is used to collect the working data during the operation of the coarse sorting unit, the impurity removal unit, and the cleaning unit. The central unit is used for controlling all units. The carbon sequestration unit is used for carbon sequestration in the coarse sorting unit. The collection unit collects the processed solid waste to form recycled aggregates. In the embodiments of the present application, when preparing recycled aggregates from civil engineering solid waste, the solid waste is first crushed by the coarse separation unit and then sorted, so that the solid waste is separated according to different particle diameters. Therefore, when performing subsequent processing, different powers and the sizes of processing equipment can be adopted according to different diameters, avoiding noise damage to the equipment due to different sizes. When treating solid waste, metals, plastics, and surface attachments in the solid waste can be treated, so that the impurity content in the finally generated solid waste is relatively low, improving the quality of the aggregates, and carbon sequestration treatment can be carried out to absorb carbon dioxide, achieving the effect of environmental protection.

[0017] Referring to Figure 1 , the coarse separation unit includes a crushing module and a sorting module. The crushing module uses a jaw crusher to coarsely crush the solid waste to a diameter within 100 mm. The sorting module passes the coarsely crushed solid waste through two layers of sieves. The aperture of the first layer of sieve is 20 mm, and the aperture of the second layer of sieve is 5 mm. The solid waste that fails to pass through the first layer of sieve is returned to the jaw crusher for further crushing. The solid waste that passes through the first layer of sieve is screened by the second layer of sieve. The large-diameter solid waste that fails to pass through the second layer of sieve and the finely crushed solid waste that passes through the second layer of sieve are separately sent into the impurity removal unit.

[0018] In the embodiments of the present application, when the coarse separation unit of the present application processes the raw solid waste, the crushing module is first used to crush it. When crushing, the solid waste that fails to pass through the first layer of sieve is returned to the jaw crusher for further crushing, avoiding the situation where the solid waste has a large size and cannot be processed subsequently. The large-diameter solid waste that fails to pass through the second layer of sieve and the finely crushed solid waste that passes through the second layer of sieve are separately sent into the impurity removal unit because it is difficult to crush some relatively hard solid waste into a particularly fine state during the treatment of solid waste. Therefore, the present application directly classifies the solid waste into large-diameter solid waste and finely crushed solid waste, enabling them to perform different processing tasks and adopting different processing powers and processing sizes for them.

[0019] Referring to Figure 1, the acquisition unit acquires the first load data information FZ1 received during the screening of the first layer of sieve mesh in the sorting module and the second load data information FZ2 received during the screening of the second layer of sieve mesh, and the acquisition unit sends the acquired first load data information FZ1 and second load data information FZ2 to the central unit. The central unit receives the first load data information FZ1 and second load data information FZ2 and compares them with the first load upper threshold FS1, the first load lower threshold FX1, the second load upper threshold FS2, and the second load lower threshold FX2 inside it. When the first load data information FZ1 ≥ the first load threshold FY1, the central unit increases the vibration frequency and tilt angle during the screening of the first layer of sieve mesh until the first load data information FZ1 < the first load threshold FY1, and then stops the adjustment. When the first load data information FZ1 ≤ the first load lower threshold FX1, the central unit decreases the vibration frequency and tilt angle during the screening of the first layer of sieve mesh until the first load data information FZ1 > the first load lower threshold FX1. When the second load data information FZ2 ≥ the second load threshold FY2, the central unit increases the vibration frequency and tilt angle during the screening of the second layer of sieve mesh until the second load data information FZ2 < the second load threshold FY2, and then stops the adjustment. When the second load data information FZ2 ≤ the second load lower threshold FX2, the central unit decreases the vibration frequency and tilt angle during the screening of the second layer of sieve mesh until the second load data information FZ2 > the second load lower threshold FX2.

[0020] In the embodiment of the present application, by acquiring the first load data information FZ1 received during the screening of the first layer of sieve mesh and the second load data information FZ2 received during the screening of the second layer of sieve mesh, the working state of the sieve mesh can be understood. When the first load data information FZ1 and the second load data information FZ2 are relatively large, the pressure received by the sieve mesh at this time is relatively large, and good screening work cannot be carried out. Therefore, in the present application, the first load data information FZ1, the second load data information FZ2 are compared with the first load upper threshold FS1, the first load lower threshold FX1, the second load upper threshold FS2, and the second load lower threshold FX2. When the first load data information FZ1 ≥ the first load threshold FY1, the load pressure is relatively large at this time, and the vibration frequency and tilt angle during the screening of the first layer of sieve mesh are promptly increased to ensure the screening effect. When the first load data information FZ1 ≤ the first load lower threshold FX1, the load of the first layer of sieve mesh is relatively low at this time, and operating at this power will cause waste of resources. The vibration frequency and tilt angle during the screening of the first layer of sieve mesh are promptly decreased, and the second layer of sieve mesh is adjusted in the same way, reducing energy consumption while ensuring the screening effect.

[0021] Refer to Figure 1, the impurity removal unit includes a heavy metal module, a light metal module, and a light impurity module. The heavy metal module uses a magnetic separator to separately separate heavy metals from large-diameter solid waste and finely crushed solid waste. The light metal module uses eddy current separation to remove light metals from large-diameter solid waste and finely crushed solid waste. The light impurity module uses a flotation cell to remove light impurities from large-diameter solid waste and finely crushed solid waste.

[0022] In the embodiment of the present application, the heavy metal module removes metals that can be magnetically attracted, such as iron, steel, etc. The light metal module removes metals that cannot be magnetically attracted, such as copper, aluminum, etc. Therefore, eddy current separation is used for removal. The light impurity module removes some lighter impurities such as plastics, foams, and woods. The present application uses different removal methods for different impurities, thereby ensuring that the impurities contained in the solid waste after treatment are relatively low.

[0023] Refer to Figure 1 , the cleaning unit uses a water jet impact device to wash away the impurity attachments adhered to the surfaces of large-diameter solid waste and finely crushed solid waste. Before the cleaning unit operates, the acquisition unit acquires the average hardness data YD, average particle size data LD, and the nozzle area data MJ of the water jet device for all the solid waste fed into the cleaning unit. The acquisition unit sends the acquired data information to the central unit. The central unit receives the acquired data information and calculates the water jet power value P. The calculation formula for the water jet power value P is , where BZ is the operating frequency of the water jet impact device under standard conditions, C1 is the hardness correlation coefficient, k2 is the particle size correlation coefficient, k3 is the area correlation coefficient. The central unit controls the operation of the water jet impact device using the calculated water jet power value P.

[0024] In the embodiment of the present application, when cleaning solid waste using a water jet impact device, if the same method is used to impact and clean different solid wastes, it is impossible to ensure that they are cleaned thoroughly. And when flushing soft solid waste with a large flow rate, it will cause damage to it. Therefore, the present application acquires the average hardness data YD, average particle size data LD, and the nozzle area data MJ of the water jet device. When the average hardness data YD and average particle size data LD are large, the power is increased. When the nozzle area data MJ of the water jet device is large, the power is increased, making the water jet impact device of the present application more suitable for the size of the solid waste during cleaning, ensuring that the surface of the solid waste is cleaned thoroughly and ensuring the integrity of the solid waste.

[0025] Refer to Figure 1, the carbon sequestration unit injects carbon dioxide gas during the crushing process of the coarse separation unit. When the collection unit collects the carbon dioxide injection by the carbon sequestration unit, the temperature data information WD, humidity data information SD, and carbon dioxide concentration data ND during the operation of the crushing module are collected. The collection unit sends the collected data to the central unit. The central unit receives the collected data and calculates the carbon dioxide injection amount ZR. The calculation formula for the carbon dioxide injection amount ZR is , where k1 and k2 are both weights, and ND is the standard carbon dioxide concentration most suitable for carbon sequestration. The central unit controls the amount of carbon dioxide introduced during carbon sequestration by the carbon sequestration unit using the calculated carbon dioxide injection amount ZR.

[0026] In the embodiment of the present application, carbon dioxide gas is injected during crushing. After the carbon dioxide is injected, the solid waste can absorb the carbon dioxide, thereby protecting the environment. Moreover, after the carbon dioxide enters the solid waste, it can fill the gaps, reduce the water absorption rate of the solid waste, and improve the frost resistance and chloride ion erosion resistance. And the calcium carbonate formed by the absorption of carbon dioxide has an inert chemical property, thereby reducing the risk of volume expansion of the aggregate in an alkaline environment. When the present application injects carbon dioxide, the temperature data information WD, humidity data information SD, and carbon dioxide concentration data ND are collected, and the calculated carbon dioxide injection amount ZR is used for control to avoid the problem that when too much carbon dioxide is injected, it cannot be diluted, and the problem that when too little carbon dioxide is injected, a high carbon sequestration effect cannot be achieved.

[0027] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The units and algorithm steps described in the embodiments can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0028] In several embodiments provided by this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0029] As described above, this is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0030] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A preparation system for recycled aggregate of civil engineering solid waste based on multi-stage sorting, characterized in that: It includes a coarse separation unit, an impurity removal unit, a cleaning unit, a data collection unit, a central unit, a carbon sequestration unit, and a collection unit. The coarse separation unit is used for crushing and primary separation of solid waste. The impurity removal unit removes impurities from the solid waste processed by the coarse separation unit. The cleaning unit is used to clean the solid waste after impurity removal. The data collection unit is used to collect the working data during the operation of the coarse separation unit, the impurity removal unit, and the cleaning unit. The central unit is used for controlling all units. The carbon sequestration unit is used for carbon sequestration in the coarse separation unit. The collection unit collects the processed solid waste to form recycled aggregates. The coarse separation unit includes a crushing module and a separation module. The crushing module uses a jaw crusher to coarsely crush the solid waste to a diameter within 100 mm. The separation module passes the coarsely crushed solid waste through two layers of sieves. The aperture of the first layer of sieve is 20 mm, and the aperture of the second layer of sieve is 5 mm. The solid waste that fails to pass through the first layer of sieve is returned to the jaw crusher for further crushing. The solid waste that passes through the first layer of sieve is screened by the second layer of sieve. The large-diameter solid waste that fails to pass through the second layer of sieve and the finely crushed solid waste that passes through the second layer of sieve are separately sent into the impurity removal unit.

2. The preparation system of recycled aggregate for civil engineering solid waste based on multi-stage sorting according to claim 1, wherein: The data collection unit collects the first load data information FZ1 received when the first layer of sieve in the separation module is screening and the second load data information FZ2 received when the second layer of sieve is screening. And the data collection unit sends the collected first load data information FZ1 and second load data information FZ2 to the central unit. The central unit receives the first load data information FZ1 and second load data information FZ2 and compares them with the first load upper threshold FS1, the first load lower threshold FX1, the second load upper threshold FS2, and the second load lower threshold FX2 inside it.

3. A preparation system for recycled aggregates of civil engineering solid waste based on multi-stage sorting according to claim 2, characterized in that: When the first load data information FZ1 ≥ the first load threshold FY1, the central unit increases the vibration frequency and tilt angle when the first layer of sieve is screening until the first load data information FZ1 < the first load threshold FY1, and then stops adjusting. When the first load data information FZ1 ≤ the first load lower threshold FX1, the central unit decreases the vibration frequency and tilt angle when the first layer of sieve is screening until the first load data information FZ1 > the first load lower threshold FX1.

4. A civil engineering solid waste recycled aggregate preparation system based on multi-stage sorting according to claim 3, characterized in that: When the second load data information FZ2 ≥ the second load threshold FY2, the central unit increases the vibration frequency and tilt angle when the second layer of sieve is screening until the second load data information FZ2 < the second load threshold FY2, and then stops adjusting. When the second load data information FZ2 ≤ the second load lower threshold FX2, the central unit decreases the vibration frequency and tilt angle when the second layer of sieve is screening until the second load data information FZ2 > the second load lower threshold FX2.

5. A preparation system for recycled aggregate of civil engineering solid waste based on multi-stage sorting according to claim 1, characterized in that: The impurity removal unit includes a heavy metal module, a light metal module, and a light impurity module. The heavy metal module uses a magnetic separator to separately separate heavy metals from large-diameter solid waste and finely crushed solid waste. The light metal module uses eddy current separation to remove light metals from large-diameter solid waste and finely crushed solid waste. The light impurity module uses a flotation cell to remove light impurities from large-diameter solid waste and finely crushed solid waste.

6. The preparation system for recycled aggregate of civil engineering solid waste based on multi-stage sorting according to claim 1, wherein: The cleaning unit uses a water jet impact device to wash away the impurity attachments adhered to the surfaces of large-diameter solid waste and finely crushed solid waste. Before the cleaning unit operates, the acquisition unit acquires the average hardness data YD, the average particle size data LD, and the nozzle area data MJ of all the solid waste fed into the cleaning unit.

7. The preparation system for recycled aggregate of civil engineering solid waste based on multi-stage sorting according to claim 6, characterized in that: The acquisition unit sends the acquired data information to the central unit, and the central unit receives the acquired data information and calculates the water jet power value P. The calculation formula for the water jet power value P is , where BZ is the working frequency of the water jet impact device under standard conditions, C1 is the hardness correlation coefficient, k2 is the particle size correlation coefficient, k3 is the area correlation coefficient, and the central unit controls the operation of the water jet impact device using the calculated water jet power value P.

8. A preparation system for recycled aggregates of civil engineering solid waste based on multi-stage sorting according to claim 1, characterized in that: The carbon fixation unit injects carbon dioxide gas during the crushing in the rough sorting unit. Moreover, when the carbon fixation unit injects carbon dioxide, the acquisition unit acquires the temperature data information WD, the humidity data information SD, and the carbon dioxide concentration data ND during the operation in the crushing module. The acquisition unit sends the acquired data to the central unit.

9. The preparation system for recycled aggregates of civil engineering solid waste based on multi-stage sorting according to claim 8, characterized in that: The central unit receives the collected data and calculates the carbon dioxide injection amount ZR. The calculation formula for the carbon dioxide injection amount ZR is , where k1 and k2 are both weights, ND is the standard concentration of carbon dioxide when carbon sequestration is most suitable. The central unit controls the amount of carbon dioxide introduced by the carbon sequestration unit during carbon sequestration using the calculated carbon dioxide injection amount ZR.

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