Bituminous pavement reclaimed material original biochemical separation process and equipment

Abstract

The invention belongs to the technical field of road engineering material recycling, and particularly relates to an asphalt pavement reclaimed material original biochemical separation process and equipment, and the process comprises the following steps: 1, recovering an old asphalt pavement to obtain an old asphalt mixture; step 2, carrying out dust removal treatment on the recycled old asphalt mixture; 3, preliminarily scattering the old asphalt mixture in a flexible scattering manner; 4, the scattered materials are subjected to primary screening; step 5, performing primary crushing on the coarse material subjected to primary screening; step 6, performing secondary crushing on the materials subjected to primary crushing; step 7, carrying out deasphalting membrane treatment on the crushed material by adopting a physical or chemical method; and step 8, performing fine screening on the material after the asphalt film is removed. Through the steps of flexible scattering, multi-stage crushing, fine screening and the like, excessive crushing of aggregates can be effectively avoided, coarse and fine aggregates with different particle sizes can be accurately separated out, and the quality and applicability of the aggregates are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of recycling and utilization of road engineering materials, and particularly to a primary separation process and equipment for recycled asphalt pavement materials. Background Art

[0002] With the development of traffic infrastructure construction, the renovation and reconstruction projects of old asphalt pavements are increasing day by day, generating a large amount of old asphalt mixtures. The traditional treatment methods often involve abandoning or simply landfilling the old asphalt mixtures, which not only causes waste of resources but also has an adverse impact on the environment. In recent years, the recycling and utilization of recycled asphalt pavement materials have gradually received attention. However, there are many problems in the existing recycling and separation processes: for example, the aggregates are excessively crushed during the separation process, affecting their performance; the efficiency of asphalt film removal is low, and the residual asphalt is difficult to effectively remove; the screening accuracy is insufficient, and it is difficult to obtain aggregates with precise particle sizes and qualified quality; the dust removal effect is unstable and cannot adapt to different working conditions. In addition, the dust removal devices used in the existing separation equipment also have defects such as single function and low intelligence, and it is difficult to meet the requirements of efficient and high-quality recycling and utilization. Therefore, there is an urgent need for a new primary separation process and equipment for recycled asphalt pavement materials to solve the above problems. Summary of the Invention

[0003] Based on the technical problems existing in the prior art, the present invention proposes a primary separation process and equipment for recycled asphalt pavement materials.

[0004] A primary separation process for recycled asphalt pavement materials proposed by the present invention includes the following steps:

[0005] Step 1, Recycling old asphalt mixture: Recycling the old asphalt pavement by milling or mechanical excavation to obtain the old asphalt mixture;

[0006] Step 2, Dust removal: Performing dust removal treatment on the recycled old asphalt mixture to remove surface dust and impurities;

[0007] Step 3, Flexible dispersion: Initially dispersing the old asphalt mixture by a flexible dispersion method to avoid excessive crushing;

[0008] Step 4, Primary screening: Performing primary screening on the dispersed material to separate out one type of fine aggregate;

[0009] Step 5, First-stage crushing: Crushing the coarse material after primary screening to reduce its particle size;

[0010] Step 6, Second-stage crushing: Crushing the material after first-stage crushing to further reduce the particle size;

[0011] Step 7, Asphalt film removal: Performing asphalt film removal treatment on the crushed material by physical or chemical methods to strip the asphalt film on the surface of the aggregate;

[0012] Step Eight: Fine Screening: Fine-screen the material after deasphalting membrane to obtain 4 - 5 kinds of coarse and fine aggregates with different particle sizes.

[0013] Preferably, in Step Seven, microwave radiation and mechanical peeling are used in combination to remove the asphalting membrane. The microwave frequency is 2.45 GHz, the power density is 0.6 - 1.0 W / g, and the asphalting membrane is directionally heated to the softening point (80 - 120 °C), combined with the impact of high-speed air flow for peeling. The film removal efficiency is increased by more than 40%, and thermal damage to the aggregates is avoided.

[0014] Preferably, in Step Eight, hyperspectral imaging (wavelength range 400 - 2500 nm) and AI recognition algorithm are integrated to detect the residual asphalt content on the surface of the aggregates in real time (error < 0.5%), and unqualified particles are accurately removed through pneumatic nozzles.

[0015] Preferably, it further includes Step Nine: Interface activation and regeneration treatment of the aggregates after fine screening. Use a silane-epoxy resin composite modifier with a concentration of 0.3 - 0.5% to increase the adhesion work of asphalt-aggregates to 5.2×10⁻³ J / m² (the traditional process is 3.8×10⁻³ J / m²).

[0016] The present invention also proposes an original biochemical separation equipment for recycled asphalt pavement materials, including: a recycling device: used for milling or mechanically excavating the old asphalt pavement; a dust removal device: used for removing dust and impurities in the old asphalt mixture; a flexible dispersion device: used for initially dispersing the old asphalt mixture; a primary screening device: used for separating out 1 kind of fine aggregate; a primary crusher and a secondary crusher: used for multi-stage crushing of the material; a deasphalting membrane device: used for peeling the asphalting membrane on the surface of the aggregates; a fine screening device: used for separating out 4 - 5 kinds of coarse and fine aggregates with different particle sizes. First, in Step One, the old asphalt pavement is milled or mechanically excavated by the recycling device, then in Step Two, the dust and impurities in the old asphalt mixture are removed by the dust removal device. Then in Step Three, the old asphalt mixture is initially dispersed by the flexible dispersion device. Then in Step Four, which follows Step Two, 1 kind of fine aggregate is separated by the primary screening device. Then in Steps Five and Six, the material is multi-stage crushed by the primary crusher and the secondary crusher respectively. Then in Step Seven, the asphalting membrane on the surface of the aggregates is peeled by the deasphalting membrane device. Then in Step Eight, 4 - 5 kinds of coarse and fine aggregates with different particle sizes are separated by the fine screening device, thus completing the entire original biochemical separation process of recycled asphalt pavement materials.

[0017] Preferably, the dust removal device is a pulse dust collector, which includes an intermediate housing, a discharge hopper, and a top cover. The intermediate housing is fixed on a bracket, the discharge hopper is fixed at the bottom of the intermediate housing, the top cover is fixed at the top of the intermediate housing. An air inlet is provided on the side of the discharge hopper, a dust discharge system is arranged at the bottom of the discharge hopper, an exhaust pipe is provided on the side of the top cover, and a centrifugal fan is connected to the outlet of the exhaust pipe. The centrifugal fan is fixed on the side of the intermediate housing through a fixing seat. A porous plate for partitioning the intermediate housing is fixed inside the top cover. Filter bag frames are respectively fixed below multiple round holes on the porous plate. A pulse cleaning system is arranged on the top cover. Multiple air outlet pipes of the pulse cleaning system are arranged inside the top cover, and multiple air nozzles on the air outlet pipes are respectively aligned with the corresponding round holes below. The dust-containing gas is introduced into the intermediate housing from the air inlet. Under the action of the centrifugal fan, the dust in the dust-containing gas is filtered onto the outer surface of the filter bag frame to form a dust cake. The purified gas is discharged from the air outlet of the centrifugal fan. The pulse cleaning system is started regularly. The pulse valve is opened, the gas enters the air outlet pipe and then sprays out from the air nozzle. Then the gas enters the filter bag frame from the round hole, causing the filter bag frame to expand instantaneously, so as to clean the dust cake on the filter bag frame. The dust cake stays in the discharge hopper temporarily, and the dust cake in the discharge hopper can be discharged regularly through the dust discharge system.

[0018] Preferably, the dust discharge system includes a dust discharge cover fixedly connected to the bottom outlet of the discharge hopper. A wind wheel is installed inside the dust discharge cover. One end of the dust discharge cover is fixed with a motor, and the output shaft of the motor is fixedly connected to the end of the wind wheel. The output shaft of the motor drives the wind wheel to rotate, and the dust cake in the discharge hopper can be discharged from the bottom outlet of the dust discharge cover through the rotating wind wheel, so as to realize the cleaning of the dust cake.

[0019] Preferably, it further includes a dust concentration acquisition module, a control module, and a material flow acquisition module. The control module is fixed on the top cover. The dust concentration acquisition module is fixed inside the discharge hopper. The material flow acquisition module is installed on the external conveyor belt. The material flow acquisition module is used to detect the raw material processing amount per unit time of the conveyor belt. The dust concentration acquisition module is used to monitor the concentration of suspended particulate matter in the air flow in real time. The control module receives the data collected by the material flow acquisition module and the dust concentration acquisition module in real time, conducts comprehensive analysis, and then generates an evaluation coefficient. By comparing the evaluation coefficient with the pre-set evaluation coefficient reference threshold, it is judged whether the current dust removal state of the equipment is within a reasonable range, and the working state of the actuator is controlled according to the comparison result. If the current dust removal state of the equipment is not within a reasonable range, the control module will automatically adjust the current working states of the pulse cleaning system and the centrifugal fan.

[0020] Preferably, a hierarchical control decision is determined according to the numerical range of the evaluation coefficient, and the corresponding control action is triggered:

[0021] The action executed under the overload condition (K≥1.2) is:

[0022] a. PID speed regulation: Dynamically adjust the fan speed (n) through the proportional-integral-derivative algorithm;

[0023] b. Activation of the pulse dust cleaning system: Start the pulse dust cleaning system and shorten the dust cleaning interval to 5 - 8 seconds per time;

[0024] The actions performed under the steady-state condition (0.8 < K < 1.2) are as follows:

[0025] a. Maintain the current speed of the variable-frequency centrifugal fan and prohibit speed regulation operations;

[0026] b. Turn off the pulse dust cleaning system to reduce energy consumption;

[0027] The actions performed under the low-efficiency condition (K ≤ 0.8) are as follows:

[0028] a. Frequency reduction operation: Reduce the speed of the centrifugal fan to 70% of the reference value;

[0029] b. Shut-down of auxiliary equipment: Completely turn off the pulse dust cleaning system and the auxiliary air supply device.

[0030] Preferably, the calculation formula for the evaluation coefficient is:

[0031]

[0032] In the formula, is the dust concentration, is the material flow rate, is the reference dust concentration, is the rated material flow rate, is the flow rate influence factor.

[0033] Compared with the prior art, the present invention provides an original biochemical separation process and equipment for recycled materials of asphalt pavement, having the following beneficial effects:

[0034] 1. An original biochemical separation process and equipment for recycled materials of asphalt pavement can effectively avoid excessive crushing of aggregates, accurately separate coarse and fine aggregates with different particle sizes through a series of steps such as flexible dispersion, multi-stage crushing, and fine screening, improving the quality and applicability of the aggregates.

[0035] 2. An original biochemical separation process and equipment for recycled materials of asphalt pavement adopt the synergistic de-asphalt film technology of microwave radiation and mechanical stripping, use microwave to directionally heat the asphalt film to the softening point, cooperate with high-speed air flow impact stripping, the de-film efficiency is increased by more than 40%, and at the same time, the thermal damage of the aggregates is avoided, ensuring the performance of the aggregates.

[0036] 3. A process and equipment for the original biochemical separation of recycled asphalt pavement materials. In the fine screening step, hyperspectral imaging and AI recognition algorithms are integrated to detect the residual asphalt content on the surface of aggregates in real time, with an error < 0.5%. Unqualified particles are accurately removed through pneumatic nozzles, ensuring the quality of aggregates.

[0037] 4. A process and equipment for the original biochemical separation of recycled asphalt pavement materials. The aggregates after fine screening are subjected to interfacial activation and regeneration treatment, and a silane-epoxy resin composite modifier is used to greatly improve the adhesion work between asphalt and aggregates, which is increased from 3.8×10⁻³ J / m² in the traditional process to 5.2×10⁻³ J / m², facilitating the improvement of the performance of recycled asphalt mixtures.

[0038] 5. A process and equipment for the original biochemical separation of recycled asphalt pavement materials. The dust removal device uses a pulse dust collector, which is combined with a dust concentration acquisition module, a control module, and a material flow acquisition module. It can automatically adjust the working states of the pulse cleaning system and the centrifugal fan according to different working conditions (overload, steady state, low efficiency), ensuring the dust removal effect while achieving energy conservation and consumption reduction. Through hierarchical control decisions such as PID speed regulation and adjustment of the cleaning interval, the stability and reliability of the equipment operation are improved. Description of the Drawings

[0039] Figure 1 It is a schematic structural diagram of the first angle of the dust removal device in a piece of equipment for the original biochemical separation of recycled asphalt pavement materials proposed by the present invention;

[0040] Figure 2 It is a schematic structural diagram of the second angle of the dust removal device in a piece of equipment for the original biochemical separation of recycled asphalt pavement materials proposed by the present invention;

[0041] Figure 3 It is a schematic internal structure diagram of the dust removal device in a piece of equipment for the original biochemical separation of recycled asphalt pavement materials proposed by the present invention;

[0042] Figure 4 It is a schematic installation structure diagram of the pulse cleaning system of the dust removal device in a piece of equipment for the original biochemical separation of recycled asphalt pavement materials proposed by the present invention;

[0043] Figure 5 It is a schematic structural diagram of the ash discharge system of the dust removal device in a piece of equipment for the original biochemical separation of recycled asphalt pavement materials proposed by the present invention;

[0044] Figure 6 It is a schematic internal structure diagram of the discharge hopper of the dust removal device in a piece of equipment for the original biochemical separation of recycled asphalt pavement materials proposed by the present invention;

[0045] Figure 7 It is a schematic principle diagram of the dust removal device in a piece of equipment for the original biochemical separation of recycled asphalt pavement materials proposed by the present invention;

[0046] Figure 8 This is a flow chart of the original biochemical separation process for recycled materials from asphalt pavements proposed by the present invention.

[0047] In the figure: 1, intermediate housing; 2, discharge hopper; 3, top cover; 4, perforated plate; 5, filter bag frame; 6, pulse jet cleaning system; 7, outlet pipe; 8, air inlet; 9, ash discharge system; 10, exhaust pipe; 11, air nozzle; 12, ash discharge hood; 13, wind wheel; 14, motor; 15, fixed seat; 16, centrifugal fan; 17, support; 18, dust concentration acquisition module; 19, control module. Specific embodiments

[0048] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0050] Refer to Figures 1 - 8 , an original biochemical separation process for recycled materials from asphalt pavements, comprising the following steps:

[0051] Step 1, recycling old asphalt mixture: recycling the old asphalt pavement by milling or mechanical excavation to obtain the old asphalt mixture;

[0052] Step 2, dust removal: performing dust removal treatment on the recycled old asphalt mixture to remove surface dust and impurities;

[0053] Step 3, flexible dispersion: preliminarily dispersing the old asphalt mixture by a flexible dispersion method to avoid excessive crushing;

[0054] Step 4, primary screening: performing primary screening on the dispersed material to separate out one type of fine aggregate;

[0055] Step 5, primary crushing: performing primary crushing on the coarse material after primary screening to reduce its particle size;

[0056] Step 6, secondary crushing: performing secondary crushing on the material after primary crushing to further reduce the particle size;

[0057] Step Seven, Asphalt Film Removal: Physically or chemically treat the crushed material to remove the asphalt film and strip the asphalt film on the surface of the aggregate.

[0058] Step Eight, Fine Screening: Fine-screen the material after asphalt film removal to obtain 4 to 5 types of coarse and fine aggregates with different particle sizes.

[0059] Further, in Step Seven, microwave radiation and mechanical stripping are used in combination to remove the asphalt film. The microwave frequency is 2.45 GHz, the power density is 0.6 - 1.0 W / g, the asphalt film is directionally heated to the softening point (80 - 120 °C), and it is combined with the impact stripping of high-speed air flow. The film removal efficiency is increased by more than 40%, and thermal damage to the aggregate is avoided.

[0060] Further, in Step Eight, hyperspectral imaging and AI recognition algorithms are integrated to detect the residual asphalt content on the surface of the aggregate in real time (error < 0.5%), and unqualified particles are accurately removed through pneumatic nozzles; the wavelength coverage of the hyperspectral imaging system is 400 - 2500 nm, of which 1700 - 1750 nm is used to detect the carbonyl absorption peak of asphalt, and 2300 - 2350 nm is used to detect the combination frequency of C-H bonds; the AI recognition algorithm uses the DCNN model, the input is a data cube of 64×64 pixels×200 bands, and the output is the predicted value of asphalt coverage; the working pressure of the pneumatic nozzle is 0.6 MPa, the nozzle diameter is 0.8 mm, and the trigger response time ≤ 10 ms.

[0061] Further, it also includes Step Nine: Interface activation and regeneration treatment of the aggregates after fine screening, using a silane-epoxy resin composite modifier with a concentration of 0.3 - 0.5% to increase the asphalt-aggregate adhesion work to 5.2×10⁻³ J / m² (the traditional process is 3.8×10⁻³ J / m²).

[0062] Key parameters corresponding to this embodiment:

[0063]

[0064] Comparison of the technical indicators corresponding to this embodiment with the traditional process:

[0065]

[0066] In addition, the present invention also proposes an original biochemical separation equipment for recycled asphalt pavement materials, including: Recycling equipment: used for milling or mechanically excavating old asphalt pavements; Dust removal device: used for removing dust and impurities in old asphalt mixtures; Flexible dispersion equipment: used for initially dispersing old asphalt mixtures; Primary screening equipment: used for separating out 1 type of fine aggregate; Primary crusher and secondary crusher: used for multi-stage crushing of materials; Asphalt film removal device: used for stripping the asphalt film on the surface of the aggregate; Fine screening equipment: used for separating out 4 to 5 types of coarse and fine aggregates with different particle sizes.

[0067] During operation, in Step 1, the old asphalt pavement is milled or mechanically excavated by a recycling device. Then, in Step 2, the dust and impurities in the old asphalt mixture are removed by a dust removal device. Next, in Step 3, the old asphalt mixture is preliminarily dispersed by a flexible dispersion device. Then, in Step 4 (after Step 2), 1 type of fine aggregate is separated by a primary screening device. Next, in Steps 5 and 6, the material is multi-stage crushed by a primary crusher and a secondary crusher respectively. Then, in Step 7, the asphalt film on the surface of the aggregate is stripped by a deasphalting film device. Finally, in Step 8, 4 - 5 types of coarse and fine aggregates with different particle sizes are separated by a fine screening device, thus completing the entire original biochemical separation process of asphalt pavement recycled materials.

[0068] Among them, the dust removal device is a pulse dust collector, which includes an intermediate housing 1, a discharge hopper 2, and a top cover 3. The intermediate housing 1 is fixed on a bracket 17, the discharge hopper 2 is fixed at the bottom of the intermediate housing 1, the top cover 3 is fixed on the top of the intermediate housing 1. An air inlet 8 is provided on the side of the discharge hopper 2, a dust discharge system 9 is arranged at the bottom of the discharge hopper 2, an exhaust pipe 10 is provided on the side of the top cover 3, and the outlet of the exhaust pipe 10 is connected to a centrifugal fan 16. The centrifugal fan 16 is fixed on the side of the intermediate housing 1 through a fixing seat 15. A perforated plate 4 for partitioning the intermediate housing 1 is fixed inside the top cover 3. Below each of the multiple round holes on the perforated plate 4, a filter bag frame 5 is fixed respectively. A pulse cleaning system 6 is arranged on the top cover 3. Multiple air outlet pipes 7 of the pulse cleaning system 6 are arranged inside the top cover 3, and multiple air nozzles 11 on the air outlet pipes 7 are respectively aligned with the corresponding round holes below;

[0069] During operation, the dust-containing gas is introduced into the intermediate housing 1 from the air inlet 8. Under the action of the centrifugal fan 16, the dust in the dust-containing gas is filtered onto the outer surface of the filter bag frame 5 to form a dust cake. The purified gas is discharged from the air outlet of the centrifugal fan 16. The pulse cleaning system 6 is started regularly. The pulse valve is opened, and the gas enters the air outlet pipe 7 and then sprays out from the air nozzle 11. Then, the gas enters the filter bag frame 5 from the round hole, causing the filter bag frame 5 to expand instantaneously, thereby cleaning the dust cake on the filter bag frame 5. The dust cake temporarily stays in the discharge hopper 2, and the dust cake in the discharge hopper 2 can be discharged regularly through the dust discharge system 9.

[0070] Among them, the dust discharge system 9 includes a dust discharge cover 12 fixedly connected to the bottom outlet of the discharge hopper 2. A wind wheel 13 is installed inside the dust discharge cover 12. One end of the dust discharge cover 12 is fixed with a motor 14, and the output shaft of the motor 14 is fixedly connected to the end of the wind wheel 13;

[0071] During operation, the output shaft of the motor 14 drives the wind wheel 13 to rotate, and the dust cake in the discharge hopper 2 can be discharged from the bottom outlet of the dust discharge cover 12 through the rotating wind wheel 13, thus realizing the cleaning of the dust cake.

[0072] Further, it also includes a dust concentration acquisition module 18, a control module 19, and a material flow acquisition module. The control module 19 is fixed on the top cover 3, the dust concentration acquisition module 18 is fixed inside the discharge hopper 2, and the material flow acquisition module is installed on the external conveyor belt. The material flow acquisition module is used to detect the raw material processing amount per unit time of the conveyor belt, and the dust concentration acquisition module 18 is used to monitor the concentration of suspended particulate matter in the air flow in real time;

[0073] It should be noted that the dust concentration acquisition module 18 can be a laser scattering dust sensor or other devices capable of monitoring the concentration of suspended particulate matter in the air flow in real time. The material flow acquisition module can be a belt scale weighing sensor + speed encoder or other devices capable of detecting the raw material processing amount per unit time of the conveyor belt. The control module 19 is an embedded controller (such as the STM32 series) integrated with a data fusion algorithm. Therefore, the dust concentration acquisition module 18, the material flow acquisition module, and the control module 19 are not specifically limited here and can be selected according to actual needs;

[0074] During operation, the control module 19 receives the data collected by the material flow acquisition module and the dust concentration acquisition module 18 in real time, conducts comprehensive analysis, and then generates an evaluation coefficient. By comparing the evaluation coefficient with a pre-set evaluation coefficient reference threshold, it determines whether the current dust removal state of the equipment is within a reasonable range, and controls the working state of the actuator according to the comparison result. If the current dust removal state of the equipment is not within a reasonable range, the control module 19 will automatically adjust the current working states of the pulse dust cleaning system 6 and the centrifugal fan 16.

[0075] In another embodiment, through the cooperation among the dust concentration acquisition module 18, the material flow acquisition module, and the control module 19, a hierarchical control decision is determined according to the value range of the evaluation coefficient, and the corresponding control actions are triggered, specifically as follows:

[0076] Under the overload working condition (K≥1.2), the actions to be executed are:

[0077] a. PID speed regulation: Dynamically adjust the fan speed (n) through the proportional-integral-derivative algorithm;

[0078] b. Activation of the pulse dust cleaning system 6: Start the pulse dust cleaning system 6, and shorten the dust cleaning interval to 5 - 8 seconds / time;

[0079] Under the steady-state working condition (0.8<K<1.2), the actions to be executed are:

[0080] a. Maintain the current speed of the variable-frequency centrifugal fan 16 and prohibit speed regulation operations;

[0081] b. Turn off the pulse dust cleaning system 6 to reduce energy consumption;

[0082] The actions to be performed under low-efficiency operating conditions (K ≤ 0.8) are as follows:

[0083] a. Frequency reduction operation: Reduce the speed of the centrifugal fan 16 to 70% of the reference value;

[0084] b. Shutdown of auxiliary equipment: Completely shut down the pulse dust cleaning system 6 and the auxiliary air supply device.

[0085] Among them, the calculation formula for the evaluation coefficient is:

[0086]

[0087] In the formula, is the dust concentration, is the material flow rate, is the reference dust concentration (set value), is the rated material flow rate (equipment design value), is the flow rate influence factor (empirical coefficient).

[0088] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A process for the original biochemical separation of recycled asphalt pavement materials, characterized in that, The following steps are involved: Step 1: Recycling old asphalt mixture: Recycling old asphalt pavement by milling or mechanical excavation to obtain old asphalt mixture; Step 2: Dust removal: The recycled old asphalt mixture is subjected to dust removal to remove surface dust and impurities; Step 3: Flexible breaking up: Preliminary breaking up of the old asphalt mixture by flexible breaking up to avoid excessive breaking; Step 4: Primary screening: Perform primary screening on the dispersed materials to separate one type of fine aggregate; Step 5: Primary crushing: The coarse material after primary screening is crushed to reduce its particle size; Step 6: Secondary crushing: The material after primary crushing is subjected to secondary crushing to further reduce the particle size; Step 7: Deasphalting: Physical or chemical methods are used to remove the asphalt film from the crushed material to peel off the asphalt film on the aggregate surface; Step 8. Fine screening: Finely screen the material after deasphalting, integrate hyperspectral imaging and AI recognition algorithms, detect the residual asphalt content on the aggregate surface in real time, and accurately remove unqualified particles through pneumatic nozzles to obtain 4 to 5 coarse and fine aggregates with different particle sizes.

2. The original biochemical separation process of recycled materials for asphalt pavement according to claim 1, characterized in that, In step seven, microwave radiation and mechanical stripping are used to synergistically deasphalt the asphalt film. The microwave frequency is 2.45 GHz, the power density is 0.6-1.0 W / g, the asphalt film is heated to the softening point, and the asphalt film is stripped in combination with high-speed airflow impact.

3. A primary separation process for asphalt pavement recycled materials according to claim 1 or 2, characterized in that The method also includes step nine: performing interface activation and regeneration treatment on the finely screened aggregate, using a silane-epoxy resin composite modifier with a concentration of 0.3-0.5%.

4. A primary separation equipment for recycled asphalt pavement materials, characterized in that, The invention comprises a recycling device, a dust removal device, a flexible disintegration device, a primary screening device, a primary crusher and a secondary crusher, a deasphalting membrane device and a fine screening device; the dust removal device is a pulse dust collector, comprising an intermediate shell (1), a discharge hopper (2) and a top cover (3); the intermediate shell (1) is fixed on a bracket (17); the discharge hopper (2) is fixed on the bottom of the intermediate shell (1); the top cover (3) is fixed on the top of the intermediate shell (1); an air inlet (8) is provided on the side of the discharge hopper (2); an ash discharge system (9) is provided on the bottom of the discharge hopper (2); and an exhaust port (8) is provided on the side of the top cover (3). An air pipe (10), the outlet of the exhaust pipe (10) is connected to a centrifugal fan (16), the centrifugal fan (16) is fixed to the side of the intermediate shell (1) via a fixing seat (15), a porous plate (4) for separating the intermediate shell (1) is fixed in the top cover (3), filter bag frames (5) are respectively fixed below the multiple circular holes on the porous plate (4), a pulse cleaning system (6) is provided on the top cover (3), multiple air outlet pipes (7) of the pulse cleaning system (6) are arranged in the top cover (3), and multiple air nozzles (11) on the air outlet pipes (7) are respectively aligned with the corresponding circular holes below; It further includes a dust concentration acquisition module (18), a control module (19), and a material flow acquisition module. The control module (19) is fixed on the top cover (3), the dust concentration acquisition module (18) is fixed inside the discharge hopper (2), and the material flow acquisition module is installed on the external conveyor belt. The material flow acquisition module is used to detect the raw material processing amount per unit time of the conveyor belt, the dust concentration acquisition module (18) is used to monitor the concentration of suspended particulate matter in the air stream in real time, the control module (19) receives the data collected by the material flow acquisition module and the dust concentration acquisition module (18) and generates an evaluation coefficient, compares it with a preset reference threshold, and controls the working states of the pulse dust cleaning system (6) and the centrifugal fan (16) according to the comparison result.

5. An original biochemical separation equipment for recycled materials of asphalt pavement according to claim 4, characterized in that, The recycling equipment is used for milling or mechanically excavating old asphalt pavements; the dust removal device is used to remove dust and impurities in the old asphalt mixture; the flexible dispersion equipment is used to preliminarily disperse the old asphalt mixture; the primary screening equipment is used to separate out 1 type of fine aggregate; the primary crusher and the secondary crusher are used for multi-stage crushing of the material; the asphalt film stripping device is used to strip the asphalt film on the surface of the aggregate; the fine screening equipment is used to separate out 4 - 5 types of coarse and fine aggregates with different particle sizes.

6. The original biochemical separation equipment for recycled asphalt pavement materials according to claim 4, characterized in that, The ash discharge system (9) includes an ash discharge hood (12) fixedly connected to the bottom outlet of the discharge hopper (2). A wind wheel (13) is installed inside the ash discharge hood (12), and a motor (14) is fixed at one end of the ash discharge hood (12). The output shaft of the motor (14) is fixedly connected to the end of the wind wheel (13).

7. An original biochemical separation equipment for recycled asphalt pavement materials according to claim 4, characterized in that, Determine the hierarchical control decision according to the numerical range of the evaluation coefficient K, and trigger the corresponding control actions: When K≥1.2, the actions performed under the overload condition are: a. PID speed regulation: Dynamically adjust the fan speed through the proportional-integral-derivative algorithm; b. Activation of the pulse dust cleaning system (6): Start the pulse dust cleaning system (6), and shorten the dust cleaning interval to 5 - 8 seconds / time; When 0.8<K<1.2, the actions performed under the steady-state condition are: a. Maintain the current speed of the variable-frequency centrifugal fan (16), and prohibit speed regulation operations; b. Turn off the pulse dust cleaning system (6) to reduce energy consumption; When K≤0.8, the actions performed under the low-efficiency condition are: a. Frequency reduction operation: Reduce the speed of the centrifugal fan (16) to 70% of the reference value; b. Shut down of auxiliary equipment: Completely turn off the pulse dust cleaning system (6) and the auxiliary air supply device.

8. An original biochemical separation equipment for recycled asphalt pavement materials according to claim 7, characterized in that, The calculation formula of the evaluation coefficient is: Wherein, is the dust concentration, is the material flow rate, is the reference dust concentration, is the rated material flow rate is the flow rate influence factor.

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