Oil-stone separation process for waste asphalt mixture

Abstract

The invention provides an oil-stone separation process for a waste asphalt mixture. The oil-stone separation process specifically comprises the following steps: step 1, pretreating the waste asphalt mixture; 2, performing low-temperature pyrolysis on the waste asphalt mixture; step 3, vortex airflow separation; 4, high-frequency vibration screening is conducted; 5, electrostatic adsorption purification of the asphalt film; 6, activating the surface of the aggregate; and 7, product fractionation and collection. According to the method, the temperature can be reduced to 120-150 DEG C (energy consumption is 52kWh / t, which is reduced by 38.8%) by utilizing stepped low-temperature pyrolysis and microwave assistance, asphalt molecules are selectively heated by utilizing microwaves (2.45 GHz), the heat absorption loss of aggregates is avoided, and meanwhile, an oxidation reaction is inhibited by utilizing a nitrogen protection environment (the oxygen content is less than 5%), so that the problems of high energy consumption and asphalt aging of a hot mixing method are solved; the waste asphalt and the waste aggregate in the waste asphalt pavement material can be effectively separated, the quality of the regenerated mixture and the utilization rate of the waste material are improved, the dependence on fresh petroleum resources is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of waste asphalt mixture regeneration, and in particular relates to a waste asphalt mixture oilstone separation process. Background Art

[0002] With the rapid development of my country's economy, roads built in the early days can no longer meet their traffic functions, and many roads have entered the maintenance and renovation stages. This will generate a large amount of waste asphalt pavement materials, which will not only cause a huge waste of resources and occupy a large amount of land resources, but also cause serious pollution to the environment. In the context of the country vigorously advocating energy conservation and emission reduction and sustainable development, and repeatedly emphasizing the protection of the ecological environment, especially after the "carbon peak and carbon neutrality" goals were proposed, transportation solid waste carbon emissions have become increasingly difficult to achieve carbon neutrality. Therefore, the reuse of waste road asphalt mixtures is particularly important. The effective use of these wastes can solve problems such as land occupation, air pollution, and water pollution. It can also recycle mineral resources and asphalt resources, bringing better economic and environmental benefits.

[0003] In addition, the Chinese patent publication number is CN113786669B, and the invention is named "Method for Separating Oil and Aggregate from Waste Road Asphalt Mixture". The waste road asphalt mixture is transported to a waste road asphalt mixture oil and aggregate separation device, and is washed and dried in sequence under the vibration action of a multi-layer vibrating filter screen. The waste road asphalt mixture is then subjected to oil and aggregate separation treatment using an extracting liquid, and the asphalt and aggregate separated from the oil and aggregate are collected separately; the extracting liquid is a polar solvent, a non-polar solvent, or a mixed solvent obtained by mixing a polar solvent with a non-polar solvent.

[0004] Oil-stone separation technology uses solvents to extract the asphalt components from waste road asphalt mixtures to separate asphalt and aggregate, thereby enabling the reuse of both. However, traditional hot-mix methods consume a lot of energy and are prone to asphalt aging. Solvent extraction methods are contaminated by residual organic solvents, while cold crushing methods cannot completely separate asphalt and aggregate, resulting in generally low oil-stone separation efficiency in existing processes.

[0005] In view of this, it is very necessary to invent a waste asphalt mixture oilstone separation process. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a waste asphalt mixture oil-stone separation process to solve the problems of high energy consumption and easy aging of asphalt in the traditional hot mixing method, residual organic solvent pollution in the solvent extraction method, or the inability of the cold crushing method to achieve complete separation of asphalt and aggregate, thereby making the oil-stone separation efficiency of the existing process generally low.

[0007] A waste asphalt mixture oilstone separation process specifically comprises the following steps:

[0008] Step 1: Pretreatment of waste asphalt mixture;

[0009] Step 2: low-temperature pyrolysis of waste asphalt mixture;

[0010] Step 3: vortex airflow sorting;

[0011] Step 4: high-frequency vibration screening;

[0012] Step 5: Asphalt membrane electrostatic adsorption purification;

[0013] Step 6: Aggregate surface activation treatment;

[0014] Step 7: product fractionation and collection.

[0015] Preferably, in step one, the pretreatment of the waste asphalt mixture adopts a multi-stage crushing and screening machine (jaw crusher + impact crusher), an electromagnetic iron remover and an infrared moisture detector to crush and remove impurities from the waste asphalt mixture; the magnetic field strength of the electromagnetic iron remover is ≥1.2T; the measurement accuracy of the infrared moisture detector is ±0.5%.

[0016] Preferably, in step one, the crushing particle size is controlled as follows: primary crushing of the mixture particles to ≤50 mm (jaw crusher); secondary crushing to the target particle size (impact crusher, regulated by the sieve aperture), wherein the ordinary asphalt layer is 10-15 mm, and the asphalt mastic (SMA asphalt) layer is 5-10 mm.

[0017] Preferably, in step one, the electromagnetic iron remover is used to remove impurities, wherein metal impurities are removed by two-stage iron removal (roughing + fine separation), fiber impurities are separated by air flow (wind speed 8m / s), and the moisture content is controlled by drying to ≤1% (105°C hot air circulation).

[0018] Preferably, in step 2, the low-temperature pyrolysis of the waste asphalt mixture adopts a stepped low-temperature pyrolysis system, which is equipped with a microwave resonant cavity, a three-zone heating belt and a nitrogen protection system, and adopts three-zone temperature control (120°C / 135°C / 150°C) to soften the asphalt step by step, and at the same time cooperates with microwave assisted heating (2.45GHz, adjustable power) to reduce energy consumption by 30%.

[0019] Preferably, in step 2, the microwave resonant cavity adopts a 2.45GHz magnetron array, and the oxygen content of the nitrogen protection system is less than 5%; the temperature of zone one in the three-zone heating zone is controlled at 120±5°C, and the residence time is 3 minutes, and its main function is to soften the surface asphalt; the temperature of zone two in the three-zone heating zone is controlled at 135±3°C, and the residence time is 4 minutes, and its main function is to dissociate the asphalt aggregate interface; the temperature of zone three in the three-zone heating zone is controlled at 150±2°C, and the residence time is 12 minutes, and its main function is to melt the internal asphalt.

[0020] Preferably, in step 2, the power density of the microwave resonant cavity is: 0.5-1.2 W / g (dynamically adjusted according to the RAP water content), and the frequency modulation is: pulsed radiation (on / off ratio 1:3) to prevent local overheating.

[0021] Preferably, in steps three and four, the vortex airflow separation adopts a vortex airflow-mechanical coupling separation device, in which a spiral airflow channel with an adjustable inclination angle (15-30°) is introduced, and a high-frequency vibration plate (50-100 Hz) is set to promote asphalt stripping.

[0022] Preferably, in step 3 and step 4, the key components of the vortex airflow-mechanical coupling separation include a spiral airflow channel and a high-frequency vibration unit; the inclination angle of the spiral airflow channel is adjustable in the range of 15-30 degrees and is hydraulically driven; the airflow velocity gradient of the spiral airflow channel is from 12 m / s at the bottom to the top.

[0023] Preferably, the vibration speed regulation of the eccentric block of the high-frequency vibration unit is 50-100 Hz stepless speed regulation, and the amplitude of the high-frequency vibration unit is 0.5-2 mm (controlled in conjunction with the air flow speed).

[0024] Preferably, in step 3 and step 4, the separation mechanism used is density difference separation: asphalt particles (1.01-1.05g / cm 3 ) is carried upward by the air flow; the second is vibration-assisted stripping: mechanical vibration destroys the residual asphalt-aggregate adhesion; the graded collection used is a first-stage cyclone separator: collects asphalt particles > 75μm, and a second-stage bag dust removal: collects fine particles < 75μm.

[0025] Preferably, in step five, the asphalt film electrostatic adsorption purification uses an asymmetric electrode plate (voltage 5-10 kV) to adsorb residual asphalt particles; and cooperates with a negative pressure collection system to achieve an asphalt recovery rate of >92%.

[0026] Preferably, in step six, the aggregate surface activation treatment is performed by plasma treatment (Ar / O2 mixed gas) to restore the surface activity of the aggregate; and the adhesion between the recycled aggregate and the fresh asphalt is increased by 40%.

[0027] Preferably, in step five, the asymmetric electrode plate: positive electrode: serrated tungsten electrode (curvature radius 0.1 mm); negative electrode: porous titanium plate (pore size 2 mm); the electric field parameters generated therein are: voltage gradient: 5 kV / cm (positive and negative electrode spacing 10 cm), pulse frequency: 20 Hz (duty cycle 50%).

[0028] Preferably, in step five, the workflow of the electrostatic adsorption purification of the asphalt film is as follows: charged particles are generated, and corona discharge makes the asphalt particles positively charged; directional adsorption: the negative plate applies a high voltage of -8kV to attract particles; self-cleaning system: periodic backflushing (0.6MPa compressed air).

[0029] Preferably, in step six, the aggregate surface activation treatment includes a plasma treatment unit, a dielectric barrier discharge (DBD) reactor, wherein the electrode spacing is 5 mm, the working gas is Ar (90%) + O2 (10%) mixture, and the power density is 1.2 W / cm 2 The activation mechanism of the aggregate surface activation treatment involves physical action: plasma etching to form micro-nano structures, and chemical action: generation of active groups such as carboxyl (-COOH) and hydroxyl (-OH) on the surface.

[0030] Preferably, in step seven, the products are separated and collected by classification, and the oilstones produced in the above steps can be collected by classification.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The invented waste asphalt mixture oil-stone separation process uses stepped low-temperature pyrolysis + microwave assistance to reduce the temperature to 120-150°C (energy consumption 52kWh / t, a decrease of 38.8%), and uses microwaves to selectively heat asphalt molecules (2.45GHz) to avoid aggregate heat loss. At the same time, nitrogen is used to protect the environment (oxygen content <5%) to inhibit oxidation reactions, thereby solving the problems of high energy consumption and asphalt aging in the hot mix method.

[0033] 2. The waste asphalt mixture oil stone separation process of the invention uses a pure physical separation technology route, adopts vortex airflow sorting (without chemical additives), and an electrostatic adsorption module instead of solvent cleaning:

[0034] Asphalt recovery rate 92% vs. 88% for solvent method, VOC emission <10mg / m 3 , meeting relevant national standards, thereby solving the problem of eliminating pollution residues in the solvent extraction method.

[0035] 3. The waste asphalt mixture oil stone separation process of the invention utilizes multi-field synergistic deep separation technology and thermo-mechanical coupling to achieve low-temperature pyrolysis and softening of asphalt (viscosity reduced to 10 3 Pa·s), high-frequency vibration (80Hz) provides shear force to promote peeling; the asphalt residue on the surface of plasma-activated aggregate is less than 0.5% (microscopic infrared detection), and the surface energy is increased to 52.3mJ / m 2 (vs virgin aggregate 54.1mJ / m 2 ).

[0036] The synergistic effect of multiple physical fields enables efficient separation under mild conditions, combining environmental and economic benefits. This technology is particularly suitable for recycling applications with high RAP ratios (>50%). Through oil-rock separation technology, the old asphalt and old aggregate in waste asphalt pavement materials can be effectively separated, improving the quality of the recycled mixture and the utilization rate of the old materials, reducing dependence on fresh oil resources, lowering production costs, and preventing the environmental damage and resource waste caused by ore mining. This further optimizes the separation effect. This technology not only improves the correlation between separation effect and material quality, but also has the potential to achieve 100% recycling of oil-rich fines, significantly increasing the recycling value of waste asphalt pavement materials. These waste materials can be effectively utilized, reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a process flow chart for separating oilstone from waste asphalt mixture according to the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings:

[0039] Example:

[0040] As attached Figure 1 As shown, the present invention provides a process for separating oilstone from waste asphalt mixture, which specifically includes the following steps:

[0041] S101: Pretreatment of waste asphalt mixture: In S101, the waste asphalt mixture is pretreated by using a multi-stage crushing and screening machine (jaw crusher + impact crusher), an electromagnetic iron remover and an infrared moisture detector to crush and remove impurities from the waste asphalt mixture; the magnetic field strength of the electromagnetic iron remover is ≥1.2T; the measurement accuracy of the infrared moisture detector is ±0.5%.

[0042] S102: Low-temperature pyrolysis of waste asphalt mixture: In S102, the low-temperature pyrolysis of the waste asphalt mixture adopts a stepped low-temperature pyrolysis system, which is equipped with a microwave resonant cavity, a three-zone heating zone and a nitrogen protection system. It uses three-zone temperature control (120℃ / 135℃ / 150℃) to soften the asphalt step by step, and is combined with microwave assisted heating (2.45GHz, power adjustable) to reduce energy consumption by 30%.

[0043] S103: vortex airflow sorting;

[0044] S104: high-frequency vibration screening;

[0045] S105: Asphalt membrane electrostatic adsorption purification: In S105, the asphalt membrane electrostatic adsorption purification adopts an asymmetric electrode plate (voltage 5-10kV) to adsorb residual asphalt particles; cooperates with the negative pressure collection system to achieve an asphalt recovery rate of >92%; in S105, the asymmetric electrode plate: positive electrode: serrated tungsten electrode (curvature radius 0.1mm); negative electrode: porous titanium plate (pore size 2mm); the electric field parameters generated therein: voltage gradient: 5kV / cm (positive and negative electrode distance 10cm), pulse frequency: 20Hz (duty cycle 50%).

[0046] In the above implementation scheme, specifically, in S105, the workflow of the electrostatic adsorption purification of the asphalt film is: charged particles are generated, and corona discharge makes the asphalt particles positively charged; directional adsorption: the negative plate applies a high voltage of -8kV to attract particles; self-cleaning system: periodic backflushing (0.6MPa compressed air).

[0047] S106: Aggregate surface activation treatment: In S106, the aggregate surface activation treatment includes a plasma treatment unit, a dielectric barrier discharge (DBD) reactor, wherein the electrode spacing is 5 mm, the working gas is Ar (90%) + O2 (10%) mixture, and the power density is 1.2 W / cm 2 The activation mechanism of the aggregate surface activation treatment involves physical action: plasma etching to form micro-nano structures, and chemical action: generation of active groups such as carboxyl (-COOH) and hydroxyl (-OH) on the surface.

[0048] S107: Product classification, separation and collection: The product classification, separation and collection is to classify and collect the oilstones produced in the above steps.

[0049] In the above embodiment, specifically, in S101, the crushing particle size is controlled as follows: primary crushing of the mixture particles to ≤50 mm (jaw crusher); secondary crushing to the target particle size (impact crusher, regulated by the sieve aperture), wherein the ordinary asphalt layer is 10-15 mm, and the asphalt mastic (SMA asphalt) layer is 5-10 mm.

[0050] In the above implementation scheme, specifically, in S101, the electromagnetic iron remover is used to remove impurities, wherein metal impurities are removed by two-stage iron removal (roughing + fine separation), fiber impurities: air flow separation (wind speed 8m / s), and the moisture content is controlled to ensure: drying to ≤1% (105℃ hot air circulation).

[0051] In the above implementation scheme, specifically, in S102, the microwave resonant cavity adopts a 2.45GHz magnetron array, and the oxygen content of the nitrogen protection system is <5%; the temperature of zone one in the three-zone heating zone is controlled at 120±5°C, and the residence time is 3 minutes, and its main function is to soften the surface asphalt; the temperature of zone two in the three-zone heating zone is controlled at 135±3°C, and the residence time is 4 minutes, and its main function is to dissociate the asphalt aggregate interface; the temperature of zone three in the three-zone heating zone is controlled at 150±2°C, and the residence time is 12 minutes, and its main function is to melt the internal asphalt; in S102, the power density of the microwave resonant cavity is: 0.5-1.2W / g (dynamically adjusted according to the RAP moisture content), and the frequency modulation is: pulsed radiation (on / off ratio 1:3) to prevent local overheating.

[0052] In the above embodiment, specifically, in S103 and S104, the vortex airflow sorting adopts a vortex airflow-mechanical coupling sorting device, in which a spiral airflow channel with an adjustable inclination angle (15-30°) is introduced, and a high-frequency vibration plate (50-100Hz) is set to promote asphalt stripping.

[0053] In the above embodiment, specifically, in S103 and S104, the key components of the vortex airflow-mechanical coupling separation include a spiral airflow channel and a high-frequency vibration unit; the inclination angle of the spiral airflow channel is adjustable in the range of 15-30 degrees and is hydraulically driven; the airflow velocity gradient of the spiral airflow channel is from 12 m / s at the bottom to the top.

[0054] In the above embodiment, specifically, the eccentric block of the high-frequency vibration unit has a stepless speed regulation of 50-100 Hz, and the amplitude of the high-frequency vibration unit is 0.5-2 mm (controlled in conjunction with the air flow speed); in S103 and S104, the separation mechanism used is density difference separation: asphalt particles (1.01-1.05 g / cm 3 ) is carried upward by the air flow; the second is vibration-assisted stripping: mechanical vibration destroys the residual asphalt-aggregate adhesion; the graded collection used is a first-stage cyclone separator: collects asphalt particles > 75μm, and a second-stage bag dust removal: collects fine particles < 75μm.

[0055] In the above embodiment, specifically, in S106, the aggregate surface activation treatment restores the surface activity of the aggregate through plasma treatment (Ar / O2 mixed gas); and increases the adhesion between the recycled aggregate and fresh asphalt by 40%.

[0056] The invented waste asphalt mixture oil-rock separation process uses a stepped low-temperature pyrolysis + microwave-assisted method to reduce the temperature to 120-150°C (energy consumption 52kWh / t, a decrease of 38.8%). Microwaves are used to selectively heat asphalt molecules (2.45GHz) to avoid heat loss from aggregate absorption. Nitrogen is used to protect the environment (oxygen content <5%) and inhibit oxidation reactions, thereby solving the high energy consumption and asphalt aging problems of the hot mix method. The data comparison of the stepped low-temperature pyrolysis + microwave-assisted method is shown in Table 1:

[0057] index Traditional hot mix method The present invention Test standards Changes in asphalt softening point +8.5℃ +1.2℃ ASTM D36 Rotational viscosity (135℃) 45% increase 7% increase ASTM D4402

[0058] Table 1

[0059] The separation efficiency data comparison is shown in Table 2:

[0060] Particle size range (mm) Residual rate of cold crushing method The residual rate of the present invention ＞5 18.70％ 1.20％ 2.36-5 22.40％ 2.80％ ＜2.36 31.50％ 4.10％

[0061] Table 2

[0062] Through precise control of low-temperature physical fields, energy consumption, environmental protection and separation efficiency have been overcome at the same time. The comparison data of technology generations is shown in Table 3:

[0063] Technical Dimension First generation (hot mix) Second generation (solvent) Third generation (this invention) Separation principle High temperature melting Dissolution Extraction Physical Field Collaboration Asphalt performance maintenance △(Severe aging) ○(Partial degradation) ◎(No thermal damage) Environmental friendliness ×(High carbon emissions) ×(Solvent contamination) ◎(Zero pollution) Completeness of separation ○(Residual 8-12%) ◎(Residual 5-8%) ◎(Residue <3%)

[0064] Table 3

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations 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 understood as limiting the present invention.

[0066] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A waste asphalt mixture oil stone separation process, characterized in that: The production process of the waste asphalt mixture oil-stone separation process specifically includes the following steps: Step 1: Pretreatment of waste asphalt mixture; Step 2: low-temperature pyrolysis of waste asphalt mixture; Step 3: vortex airflow sorting; Step 4: high-frequency vibration screening; Step 5: Asphalt membrane electrostatic adsorption purification; Step 6: Aggregate surface activation treatment; Step 7: product fractionation and collection.

2. The process for separating oilstone from waste asphalt mixture according to claim 1, characterized in that: In step 1, the waste asphalt mixture is pretreated by using a multi-stage crushing and screening machine (jaw crusher + impact crusher), an electromagnetic iron remover and an infrared moisture detector to crush and remove impurities from the waste asphalt mixture; the magnetic field strength of the electromagnetic iron remover is ≥1.2T; the measurement accuracy of the infrared moisture detector is ±0.5%;.

3. The process for separating oilstone from waste asphalt mixture according to claim 1, characterized in that In step 1, the electromagnetic iron remover is used to remove impurities, wherein metal impurities are removed by two stages (roughing + cleaning), fiber impurities are separated by air flow (wind speed 8m / s), and the moisture content is controlled by drying to ≤1% (105℃ hot air circulation).

4. The process for separating oilstone from waste asphalt mixture according to claim 1, wherein: In step 2, the low-temperature pyrolysis of the waste asphalt mixture adopts a stepped low-temperature pyrolysis system, which is equipped with a microwave resonant cavity, a three-zone heating belt and a nitrogen protection system. It also adopts three-zone temperature control (120°C / 135°C / 150°C) to soften the asphalt step by step, and at the same time cooperates with microwave-assisted heating (2.45GHz, adjustable power) to reduce energy consumption by 30%.

5. The process for separating oilstone from waste asphalt mixture according to claim 1, characterized in that: In step 2, the microwave resonant cavity adopts a 2.45GHz magnetron array, and the oxygen content of the nitrogen protection system is less than 5%; the temperature of zone one in the three-zone heating zone is controlled at 120±5°C, and the residence time is 3 minutes, and its main function is to soften the surface asphalt; the temperature of zone two in the three-zone heating zone is controlled at 135±3°C, and the residence time is 4 minutes, and its main function is to dissociate the asphalt aggregate interface; the temperature of zone three in the three-zone heating zone is controlled at 150±2°C, and the residence time is 12 minutes, and its main function is to melt the internal asphalt.

6. The process for separating oilstone from waste asphalt mixture according to claim 1, characterized in that In steps three and four, the key components of the vortex airflow-mechanical coupling sorting include a spiral airflow channel and a high-frequency vibration unit; the inclination angle of the spiral airflow channel can be adjusted from 15 to 30 degrees and is hydraulically driven; the airflow velocity gradient of the spiral airflow channel is from 12 m / s at the bottom to the top.

7. The process for separating oilstone from waste asphalt mixture according to claim 1, characterized in that: In step five, the electrostatic adsorption purification of the asphalt membrane adopts an asymmetric electrode plate (voltage 5-10kV) to adsorb residual asphalt particles; cooperates with the negative pressure collection system to achieve an asphalt recovery rate of >92%; in step five, the asymmetric electrode plate: positive electrode: serrated tungsten electrode (curvature radius 0.1mm); negative electrode: porous titanium plate (pore size 2mm); the electric field parameters generated therein are: voltage gradient: 5kV / cm (positive and negative electrode distance 10cm), pulse frequency: 20Hz (duty cycle 50%).

8. The process for separating oilstone from waste asphalt mixture according to claim 1, wherein: In step five, the workflow of the electrostatic adsorption purification of the asphalt film is as follows: charged particles are generated, and corona discharge makes the asphalt particles positively charged; directional adsorption: the negative plate applies a high voltage of -8kV to attract particles; self-cleaning system: periodic backflushing (0.6MPa compressed air).

9. The process for separating oilstone from waste asphalt mixture according to claim 1, wherein: In step 6, the aggregate surface activation treatment includes a plasma treatment unit, a dielectric barrier discharge (DBD) reactor, wherein the electrode spacing is 5 mm, the working gas is Ar (90%) + O2 (10%) mixture, and the power density is 1.2 W / cm 2 The activation mechanism of the aggregate surface activation treatment involves physical action: plasma etching to form micro-nano structures, and chemical action: generation of active groups such as carboxyl (-COOH) and hydroxyl (-OH) on the surface.

10. The process for separating oilstone from waste asphalt mixture according to claim 1, characterized in that: In steps 3 and 4, the separation mechanism used is density difference separation: asphalt particles (1.01-1.05g / cm 3 ) is carried upward by the air flow; the second is vibration-assisted stripping: mechanical vibration destroys the residual asphalt-aggregate adhesion; the graded collection used is a first-stage cyclone separator: collects asphalt particles > 75μm, and a second-stage bag dust removal: collects fine particles < 75μm.

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