CN114713595B - Separation method for recycling asphalt and aggregate in old asphalt concrete - Google Patents
Separation method for recycling asphalt and aggregate in old asphalt concrete Download PDFInfo
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- CN114713595B CN114713595B CN202210379659.7A CN202210379659A CN114713595B CN 114713595 B CN114713595 B CN 114713595B CN 202210379659 A CN202210379659 A CN 202210379659A CN 114713595 B CN114713595 B CN 114713595B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 309
- 238000000926 separation method Methods 0.000 title claims abstract description 65
- 239000011384 asphalt concrete Substances 0.000 title claims abstract description 59
- 238000004064 recycling Methods 0.000 title claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 96
- 239000000463 material Substances 0.000 claims abstract description 85
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 239000000428 dust Substances 0.000 claims abstract description 36
- 230000008014 freezing Effects 0.000 claims abstract description 34
- 238000007710 freezing Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 239000004927 clay Substances 0.000 claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 238000012216 screening Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 29
- 239000003795 chemical substances by application Substances 0.000 claims description 26
- 239000012535 impurity Substances 0.000 claims description 24
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 22
- 239000012528 membrane Substances 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 12
- RFRXIWQYSOIBDI-UHFFFAOYSA-N benzarone Chemical compound CCC=1OC2=CC=CC=C2C=1C(=O)C1=CC=C(O)C=C1 RFRXIWQYSOIBDI-UHFFFAOYSA-N 0.000 claims description 11
- 230000000975 bioactive effect Effects 0.000 claims description 11
- 239000002608 ionic liquid Substances 0.000 claims description 11
- 239000011297 pine tar Substances 0.000 claims description 11
- 229940068124 pine tar Drugs 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- 239000003784 tall oil Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000003595 mist Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 9
- 230000002349 favourable effect Effects 0.000 description 8
- 238000004506 ultrasonic cleaning Methods 0.000 description 8
- 230000003213 activating effect Effects 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 239000002699 waste material Substances 0.000 description 4
- 238000005119 centrifugation Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Working-Up Tar And Pitch (AREA)
Abstract
The invention provides a separation method for asphalt and aggregate in recycled old asphalt concrete, which relates to the technical field of asphalt processing and comprises the following steps: recycling old asphalt concrete blocks, cleaning, screening, and removing dust and clay to obtain recycled asphalt treatment materials; crushing the treated recycled asphalt treatment material into asphalt old material particles; stirring the old asphalt particles by using an electromagnetic roller; according to the invention, old asphalt particles are obtained by crushing, firstly, the frozen asphalt film on the surfaces of the old asphalt particles is separated by freezing and centrifugal treatment, so that the asphalt film and aggregate are obtained, the obtained product is used as first separation, then the asphalt film is melted into liquid state by heating, so that residual asphalt on the surface of the aggregate is melted and flows out, after solid-liquid separation, unmelted fine materials and asphalt film melt in the asphalt film are obtained, and the obtained aggregate and residual asphalt melt are obtained, so that the obtained product is used as second separation, and the freezing and heating are matched, thereby being beneficial to separating residual asphalt in the old asphalt and being more sufficient.
Description
Technical Field
The invention relates to the technical field of asphalt processing, in particular to a separation method for recycling asphalt and aggregate in old asphalt concrete.
Background
Asphalt concrete is commonly called asphalt concrete, which is a mixture prepared by manually selecting mineral aggregate, crushed stone or crushed gravel, stone scraps or sand, mineral powder and the like with a certain grading composition and mixing the mineral aggregate with road asphalt material in a certain proportion under a strictly controlled condition, and has extremely wide application range in building construction such as pavement paving and the like and huge use amount;
the current asphalt concrete has extremely slow natural degradation and weathering speed after finishing paving operation, when the construction, pavement and other structures are required to be renovated and maintained, a large amount of waste asphalt concrete is generated, and the waste asphalt concrete is required to be separated and recycled, and in the prior art, as disclosed in an authorized publication No. CN 109736160B, a method for separating asphalt and aggregate in recycled old asphalt concrete comprises four steps of collecting, crushing, separating, mixing and regenerating the waste asphalt concrete, and the waste asphalt concrete is recycled efficiently; however, in the above technology, when asphalt is separated from aggregate, only simple heating separation is adopted, asphalt recovery is insufficient, pretreatment is not complete enough, and impurities affecting asphalt quality remain in the asphalt, so the invention provides a separation method for recovering asphalt and aggregate in old asphalt concrete to solve the problems in the prior art.
Disclosure of Invention
Aiming at the problems, the invention provides a method for separating asphalt and aggregate in recycled old asphalt concrete, which is favorable for separating residual asphalt in old materials by matching with the method for separating asphalt and aggregate in recycled old asphalt concrete through freezing and heating, and has more sufficient separation.
In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: a method for separating asphalt from aggregate in recycled old asphalt concrete comprises the following steps:
recycling old asphalt concrete blocks, cleaning, screening, and removing dust and clay to obtain recycled asphalt treatment materials;
crushing the treated recycled asphalt treatment material into asphalt old material particles;
stirring old asphalt particles by using an electromagnetic roller, and adsorbing metal impurities in the particles;
freezing old asphalt particles, centrifuging after freezing, enabling asphalt films frozen on the surfaces of the old asphalt particles to fall off by utilizing centrifugal force and friction, and screening to obtain asphalt films and aggregates;
preparing a regenerated separating agent, namely respectively adding the regenerated separating agent into an asphalt film and an aggregate, and respectively heating the asphalt film and the aggregate to enable the asphalt film to be melted into a liquid state, so that residual asphalt on the surface of the aggregate flows out in a melting way;
carrying out solid-liquid separation on the melt of the asphalt membrane to separate unmelted fine materials and asphalt membrane melt, and carrying out solid-liquid separation on the aggregate to separate aggregate and residual asphalt melt;
and adding the residual asphalt melt into the asphalt film melt to obtain recycled asphalt, and then respectively recycling and storing the separated aggregate as coarse material and fine material to obtain the aggregate.
The further improvement is that: spraying water mist to spray and rinse the old asphalt concrete blocks for 30-60min, controlling the temperature at normal temperature, dissolving and flushing dust and clay on the surfaces of the old asphalt concrete blocks, then ultrasonically cleaning the surfaces of the old asphalt concrete blocks by ultrasonic waves, controlling the ultrasonic frequency at 30KHz-60KHz, and removing residual dust and clay again to obtain the recycled asphalt treated material.
The further improvement is that: crushing the recovered asphalt treatment material by using a crusher, wherein the crushing temperature is controlled at 0 ℃, and crushing the recovered asphalt treatment material into asphalt old material particles with the diameter of 50-90 mm.
The further improvement is that: pouring old asphalt particles into a mixing hopper, inserting an electromagnetic roller into the old asphalt particles, electrifying the electromagnetic roller and eccentrically rotating in the mixing hopper to adsorb out metal impurities in the particles, controlling the temperature to be normal temperature in the process, and controlling the eccentric rotating speed of the electromagnetic roller to be 30r/min.
The further improvement is that: freezing the old asphalt particles at-50deg.C to-10deg.C for 10-20min to frost the surfaces of the old asphalt particles, wherein a liquid nitrogen cooler is used for freezing.
The further improvement is that: centrifuging the frozen old asphalt particles by using a centrifuge, controlling the rotating speed of the centrifuge to be 1500-2000r/min, controlling the centrifuging temperature to be-10-0 ℃, rubbing and falling off the frozen asphalt film on the surfaces of the old asphalt particles, synchronously starting a dust remover, capturing dust with the particle size less than or equal to 0.075mm, centrifuging, screening the centrifuged materials by using a vibrating screen, and separating the asphalt film and aggregate.
The further improvement is that: preparing a regenerated separating agent, and preparing the following raw materials in mass ratio: 15-20 parts of benzofuran, 5-8 parts of pine tar, 5-9 parts of tall oil, 8-12 parts of bioactive powder, 15-20 parts of ionic liquid and 55-65 parts of n-pentane, and stirring and mixing the raw materials at 30-50 ℃, controlling the rotating speed to be 50-100r/min to obtain a regenerated separating agent, and preserving at normal temperature.
The further improvement is that: adding the regenerated separating agent into the asphalt film and the aggregate respectively, heating the asphalt film and the aggregate respectively by adopting heat radiation, controlling the temperature to be 500-800 ℃, and preserving the heat for 10-15min to enable the asphalt film to be melted into a liquid state, mixing the fine materials in the liquid state, enabling residual asphalt on the surface of the aggregate to be melted and flow out, and mixing the asphalt into the aggregate.
The further improvement is that: and (3) carrying out solid-liquid separation on the melt of the asphalt membrane by adopting a solid-liquid separator, cleaning, drying and recycling the separated unmelted fine materials, carrying out solid-liquid separation on the aggregate by adopting the solid-liquid separator, and cleaning, drying and recycling the separated aggregate.
The further improvement is that: adding the residual asphalt melt into the asphalt film melt, storing at a constant temperature of 500-600 ℃ to obtain recycled asphalt, and respectively and intensively storing the separated aggregate as coarse material and fine material at a temperature of 10-25 ℃ to obtain the aggregate.
The beneficial effects of the invention are as follows:
1. according to the invention, old asphalt particles are obtained by utilizing a crushing means, firstly, the frozen asphalt film on the surfaces of the old asphalt particles is subjected to freezing and centrifugal treatment, so that the asphalt film and aggregate are obtained, the old asphalt particles are used as first separation, then, the asphalt film is melted into a liquid state by heating, so that residual asphalt on the surfaces of the aggregates flows out in a melting way, after solid-liquid separation, unmelted fine materials and asphalt film melt in the asphalt film are obtained, and the aggregates and residual asphalt melt are obtained, so that the old asphalt particles are used as second separation, and the freezing and the heating are matched, so that the residual asphalt in the old asphalt is separated, the separation is more sufficient, the separated aggregates are separated and recovered as coarse materials and separated fine materials, the aggregate classification is finer, and the secondary utilization is facilitated.
2. Before separation, dust and clay on old asphalt concrete blocks are removed by means of spraying water mist and ultrasonic cleaning, after crushing, an electromagnetic roller is inserted into old asphalt particles, the electromagnetic roller is electrified and eccentrically rotates in a mixing hopper to adsorb metal impurities in the particles, so that the removal of various impurities in the old asphalt concrete blocks is facilitated, the quality of asphalt and aggregate after separation is prevented from being influenced, and the method is more reliable.
3. According to the invention, the regenerated separating agent is prepared from benzofuran, pine tar, tall oil, bioactive powder, ionic liquid and n-pentane, and verified, so that the method is favorable for improving the oil yield, activating old asphalt, improving the quality of asphalt and facilitating sustainable recycling of asphalt.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be further described in detail with reference to the following examples, which are only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Example 1
According to fig. 1, this embodiment provides a method for separating asphalt from aggregate in recycled old asphalt concrete, comprising the following steps:
recycling old asphalt concrete blocks, cleaning, screening, and removing dust and clay to obtain recycled asphalt treatment materials;
crushing the treated recycled asphalt treatment material into asphalt old material particles;
stirring old asphalt particles by using an electromagnetic roller, and adsorbing metal impurities in the particles;
freezing old asphalt particles, centrifuging after freezing, enabling asphalt films frozen on the surfaces of the old asphalt particles to fall off by utilizing centrifugal force and friction, and screening to obtain asphalt films and aggregates;
preparing a regenerated separating agent, namely respectively adding the regenerated separating agent into an asphalt film and an aggregate, and respectively heating the asphalt film and the aggregate to enable the asphalt film to be melted into a liquid state, so that residual asphalt on the surface of the aggregate flows out in a melting way;
carrying out solid-liquid separation on the melt of the asphalt membrane to separate unmelted fine materials and asphalt membrane melt, and carrying out solid-liquid separation on the aggregate to separate aggregate and residual asphalt melt;
and adding the residual asphalt melt into the asphalt film melt to obtain recycled asphalt, and then respectively recycling and storing the separated aggregate as coarse material and fine material to obtain the aggregate.
According to the invention, old asphalt particles are obtained by utilizing a crushing means, firstly, the frozen asphalt film on the surfaces of the old asphalt particles is subjected to freezing and centrifugal treatment, so that the asphalt film and aggregate are obtained, the old asphalt particles are used as first separation, then the asphalt film is melted into a liquid state by heating, so that residual asphalt on the surfaces of the aggregates flows out in a melting way, after solid-liquid separation, unmelted fine materials and asphalt film melt in the asphalt film are obtained, and the aggregates and residual asphalt melt are obtained, and are used as second separation, and the freezing and heating are matched, so that the residual asphalt in the old materials is separated, the separation is more sufficient, the separated aggregates are separated and recovered as coarse materials and separated fine materials, the aggregate classification is finer, and the secondary utilization is facilitated;
before separation, dust and clay on old asphalt concrete blocks are removed through cleaning and screening, after crushing, old asphalt particles are stirred by using an electromagnetic roller, metal impurities in the particles are adsorbed, various impurities in the old asphalt are removed, the quality of asphalt and aggregate after separation is prevented from being influenced, and the method is more reliable.
Example two
The embodiment provides a separation method for recycling asphalt and aggregate in old asphalt concrete, which comprises the following steps:
spraying water mist is adopted to spray and rinse the old asphalt concrete blocks, the spraying time is 50min, the temperature is controlled to be normal temperature, dust and clay on the surfaces of the old asphalt concrete blocks are dissolved and washed down, then ultrasonic waves are adopted to carry out ultrasonic cleaning on the surfaces of the old asphalt concrete blocks, the ultrasonic frequency is controlled to be 50KHz, and residual dust and clay are removed again, so that the recycled asphalt treatment material is obtained.
Crushing the recovered asphalt treatment material by using a crusher, wherein the crushing temperature is controlled at 0 ℃, and crushing the recovered asphalt treatment material into asphalt old material particles with the diameter of 50-90 mm.
Pouring old asphalt particles into a mixing hopper, inserting an electromagnetic roller into the old asphalt particles, electrifying the electromagnetic roller and eccentrically rotating in the mixing hopper to adsorb out metal impurities in the particles, controlling the temperature to be normal temperature in the process, and controlling the eccentric rotating speed of the electromagnetic roller to be 30r/min. Before separation, dust and clay on old asphalt concrete blocks are removed by means of spraying water mist and ultrasonic cleaning, after crushing, an electromagnetic roller is inserted into old asphalt particles, the electromagnetic roller is electrified and eccentrically rotates in a mixing hopper to adsorb metal impurities in the particles, so that the removal of various impurities in the old asphalt concrete blocks is facilitated, the quality of asphalt and aggregate after separation is prevented from being influenced, and the method is more reliable.
Freezing the old asphalt particles, controlling the temperature to be minus 35 ℃, and freezing for 15min to enable the surfaces of the old asphalt particles to frost, wherein a liquid nitrogen cooler is adopted for freezing.
Centrifuging the frozen old asphalt particles by using a centrifuge, controlling the rotation speed of the centrifuge to 1800r/min, controlling the centrifugation temperature to-5 ℃, rubbing and falling off the frozen asphalt film on the surface of the old asphalt particles, synchronously starting a dust remover, capturing dust with the particle size less than or equal to 0.075mm, centrifuging, screening the centrifuged materials by using a vibrating screen, and separating the asphalt film and aggregate. When in use, the dust remover is used for capturing dust with the particle size less than or equal to 0.075mm, which is favorable for removing tiny splashed impurities and avoiding polluting the environment. According to the invention, old asphalt particles are obtained by utilizing a crushing means, and the frozen asphalt film on the surfaces of the old asphalt particles is separated by freezing and centrifugal treatment, so that the asphalt film and aggregate are obtained and are used as first separation.
Preparing a regenerated separating agent, and preparing the following raw materials in mass ratio: 15 parts of benzofuran, 5 parts of pine tar, 5 parts of tall oil, 8 parts of bioactive powder, 15 parts of ionic liquid and 55 parts of n-pentane, and stirring and mixing the raw materials at 40 ℃ at the rotating speed of 80r/min to obtain a regenerated separating agent, and preserving at normal temperature. According to the invention, the regenerated separating agent is prepared from benzofuran, pine tar, tall oil, bioactive powder, ionic liquid and n-pentane, and verified, so that the method is favorable for improving the oil yield, activating old asphalt, improving the quality of asphalt and facilitating sustainable recycling of asphalt.
Adding the regenerated separating agent into the asphalt film and the aggregate respectively, heating the asphalt film and the aggregate respectively by adopting heat radiation, controlling the temperature to be 700 ℃, and preserving the heat for 12min to enable the asphalt film to be melted into a liquid state, mixing the fine materials in the liquid state, enabling the residual asphalt on the surface of the aggregate to be melted and flow out, and mixing the asphalt into the aggregate.
And (3) carrying out solid-liquid separation on the melt of the asphalt membrane by adopting a solid-liquid separator, cleaning, drying and recycling the separated unmelted fine materials, carrying out solid-liquid separation on the aggregate by adopting the solid-liquid separator, and cleaning, drying and recycling the separated aggregate. According to the invention, the asphalt film is melted into a liquid state through heating, so that residual asphalt on the surface of the aggregate flows out through melting, and after solid-liquid separation, unmelted fine materials in the asphalt film and the asphalt film melt are obtained, so that the aggregate and the residual asphalt melt are obtained, and are used as a second part for separation, and the combination of freezing and heating is beneficial to separating residual asphalt in the old materials, so that the separation is more sufficient.
Adding the residual asphalt melt into the asphalt membrane melt, storing at a constant temperature of 550 ℃ to obtain recycled asphalt, and respectively and intensively storing the separated aggregate as coarse material and fine material in an environment of 20 ℃ to obtain the aggregate. The invention saves the recycled asphalt and the aggregate through a proper temperature, avoids the deterioration of the recycled asphalt and the aggregate, ensures the quality and is convenient for secondary utilization.
Example III
The embodiment provides a separation method for recycling asphalt and aggregate in old asphalt concrete, which comprises the following steps:
spraying water mist is adopted to spray and rinse the old asphalt concrete blocks, the spraying time is 50min, the temperature is controlled to be normal temperature, dust and clay on the surfaces of the old asphalt concrete blocks are dissolved and washed down, then ultrasonic waves are adopted to carry out ultrasonic cleaning on the surfaces of the old asphalt concrete blocks, the ultrasonic frequency is controlled to be 50KHz, and residual dust and clay are removed again, so that the recycled asphalt treatment material is obtained.
Crushing the recovered asphalt treatment material by using a crusher, wherein the crushing temperature is controlled at 0 ℃, and crushing the recovered asphalt treatment material into asphalt old material particles with the diameter of 50-90 mm.
Pouring old asphalt particles into a mixing hopper, inserting an electromagnetic roller into the old asphalt particles, electrifying the electromagnetic roller and eccentrically rotating in the mixing hopper to adsorb out metal impurities in the particles, controlling the temperature to be normal temperature in the process, and controlling the eccentric rotating speed of the electromagnetic roller to be 30r/min. Before separation, dust and clay on old asphalt concrete blocks are removed by means of spraying water mist and ultrasonic cleaning, after crushing, an electromagnetic roller is inserted into old asphalt particles, the electromagnetic roller is electrified and eccentrically rotates in a mixing hopper to adsorb metal impurities in the particles, so that the removal of various impurities in the old asphalt concrete blocks is facilitated, the quality of asphalt and aggregate after separation is prevented from being influenced, and the method is more reliable.
Freezing the old asphalt particles, controlling the temperature to be minus 35 ℃, and freezing for 15min to enable the surfaces of the old asphalt particles to frost, wherein a liquid nitrogen cooler is adopted for freezing.
Centrifuging the frozen old asphalt particles by using a centrifuge, controlling the rotation speed of the centrifuge to 1800r/min, controlling the centrifugation temperature to-5 ℃, rubbing and falling off the frozen asphalt film on the surface of the old asphalt particles, synchronously starting a dust remover, capturing dust with the particle size less than or equal to 0.075mm, centrifuging, screening the centrifuged materials by using a vibrating screen, and separating the asphalt film and aggregate. When in use, the dust remover is used for capturing dust with the particle size less than or equal to 0.075mm, which is favorable for removing tiny splashed impurities and avoiding polluting the environment. According to the invention, old asphalt particles are obtained by utilizing a crushing means, and the frozen asphalt film on the surfaces of the old asphalt particles is separated by freezing and centrifugal treatment, so that the asphalt film and aggregate are obtained and are used as first separation.
Preparing a regenerated separating agent, and preparing the following raw materials in mass ratio: 18 parts of benzofuran, 7 parts of pine tar, 8 parts of tall oil, 10 parts of bioactive powder, 18 parts of ionic liquid and 60 parts of n-pentane, and stirring and mixing the raw materials at 40 ℃ at the rotating speed of 80r/min to obtain a regenerated separating agent, and preserving at normal temperature. According to the invention, the regenerated separating agent is prepared from benzofuran, pine tar, tall oil, bioactive powder, ionic liquid and n-pentane, and verified, so that the method is favorable for improving the oil yield, activating old asphalt, improving the quality of asphalt and facilitating sustainable recycling of asphalt.
Adding the regenerated separating agent into the asphalt film and the aggregate respectively, heating the asphalt film and the aggregate respectively by adopting heat radiation, controlling the temperature to be 700 ℃, and preserving the heat for 12min to enable the asphalt film to be melted into a liquid state, mixing the fine materials in the liquid state, enabling the residual asphalt on the surface of the aggregate to be melted and flow out, and mixing the asphalt into the aggregate.
And (3) carrying out solid-liquid separation on the melt of the asphalt membrane by adopting a solid-liquid separator, cleaning, drying and recycling the separated unmelted fine materials, carrying out solid-liquid separation on the aggregate by adopting the solid-liquid separator, and cleaning, drying and recycling the separated aggregate. According to the invention, the asphalt film is melted into a liquid state through heating, so that residual asphalt on the surface of the aggregate flows out through melting, and after solid-liquid separation, unmelted fine materials in the asphalt film and the asphalt film melt are obtained, so that the aggregate and the residual asphalt melt are obtained, and are used as a second part for separation, and the combination of freezing and heating is beneficial to separating residual asphalt in the old materials, so that the separation is more sufficient.
Adding the residual asphalt melt into the asphalt membrane melt, storing at a constant temperature of 550 ℃ to obtain recycled asphalt, and respectively and intensively storing the separated aggregate as coarse material and fine material in an environment of 20 ℃ to obtain the aggregate. The invention saves the recycled asphalt and the aggregate through a proper temperature, avoids the deterioration of the recycled asphalt and the aggregate, ensures the quality and is convenient for secondary utilization.
Example IV
The embodiment provides a separation method for recycling asphalt and aggregate in old asphalt concrete, which comprises the following steps:
spraying water mist is adopted to spray and rinse the old asphalt concrete blocks, the spraying time is 50min, the temperature is controlled to be normal temperature, dust and clay on the surfaces of the old asphalt concrete blocks are dissolved and washed down, then ultrasonic waves are adopted to carry out ultrasonic cleaning on the surfaces of the old asphalt concrete blocks, the ultrasonic frequency is controlled to be 50KHz, and residual dust and clay are removed again, so that the recycled asphalt treatment material is obtained.
Crushing the recovered asphalt treatment material by using a crusher, wherein the crushing temperature is controlled at 0 ℃, and crushing the recovered asphalt treatment material into asphalt old material particles with the diameter of 50-90 mm.
Pouring old asphalt particles into a mixing hopper, inserting an electromagnetic roller into the old asphalt particles, electrifying the electromagnetic roller and eccentrically rotating in the mixing hopper to adsorb out metal impurities in the particles, controlling the temperature to be normal temperature in the process, and controlling the eccentric rotating speed of the electromagnetic roller to be 30r/min. Before separation, dust and clay on old asphalt concrete blocks are removed by means of spraying water mist and ultrasonic cleaning, after crushing, an electromagnetic roller is inserted into old asphalt particles, the electromagnetic roller is electrified and eccentrically rotates in a mixing hopper to adsorb metal impurities in the particles, so that the removal of various impurities in the old asphalt concrete blocks is facilitated, the quality of asphalt and aggregate after separation is prevented from being influenced, and the method is more reliable.
Freezing the old asphalt particles, controlling the temperature to be minus 35 ℃, and freezing for 15min to enable the surfaces of the old asphalt particles to frost, wherein a liquid nitrogen cooler is adopted for freezing.
Centrifuging the frozen old asphalt particles by using a centrifuge, controlling the rotation speed of the centrifuge to 1800r/min, controlling the centrifugation temperature to-5 ℃, rubbing and falling off the frozen asphalt film on the surface of the old asphalt particles, synchronously starting a dust remover, capturing dust with the particle size less than or equal to 0.075mm, centrifuging, screening the centrifuged materials by using a vibrating screen, and separating the asphalt film and aggregate. When in use, the dust remover is used for capturing dust with the particle size less than or equal to 0.075mm, which is favorable for removing tiny splashed impurities and avoiding polluting the environment. According to the invention, old asphalt particles are obtained by utilizing a crushing means, and the frozen asphalt film on the surfaces of the old asphalt particles is separated by freezing and centrifugal treatment, so that the asphalt film and aggregate are obtained and are used as first separation.
Preparing a regenerated separating agent, and preparing the following raw materials in mass ratio: 20 parts of benzofuran, 8 parts of pine tar, 9 parts of tall oil, 12 parts of bioactive powder, 20 parts of ionic liquid and 65 parts of n-pentane, and stirring and mixing the raw materials at 40 ℃, controlling the rotating speed to 80r/min, thus obtaining the regenerated separating agent, and preserving at normal temperature. According to the invention, the regenerated separating agent is prepared from benzofuran, pine tar, tall oil, bioactive powder, ionic liquid and n-pentane, and verified, so that the method is favorable for improving the oil yield, activating old asphalt, improving the quality of asphalt and facilitating sustainable recycling of asphalt.
Adding the regenerated separating agent into the asphalt film and the aggregate respectively, heating the asphalt film and the aggregate respectively by adopting heat radiation, controlling the temperature to be 700 ℃, and preserving the heat for 12min to enable the asphalt film to be melted into a liquid state, mixing the fine materials in the liquid state, enabling the residual asphalt on the surface of the aggregate to be melted and flow out, and mixing the asphalt into the aggregate.
And (3) carrying out solid-liquid separation on the melt of the asphalt membrane by adopting a solid-liquid separator, cleaning, drying and recycling the separated unmelted fine materials, carrying out solid-liquid separation on the aggregate by adopting the solid-liquid separator, and cleaning, drying and recycling the separated aggregate. According to the invention, the asphalt film is melted into a liquid state through heating, so that residual asphalt on the surface of the aggregate flows out through melting, and after solid-liquid separation, unmelted fine materials in the asphalt film and the asphalt film melt are obtained, so that the aggregate and the residual asphalt melt are obtained, and are used as a second part for separation, and the combination of freezing and heating is beneficial to separating residual asphalt in the old materials, so that the separation is more sufficient.
Adding the residual asphalt melt into the asphalt membrane melt, storing at a constant temperature of 550 ℃ to obtain recycled asphalt, and respectively and intensively storing the separated aggregate as coarse material and fine material in an environment of 20 ℃ to obtain the aggregate. The invention saves the recycled asphalt and the aggregate through a proper temperature, avoids the deterioration of the recycled asphalt and the aggregate, ensures the quality and is convenient for secondary utilization.
According to the second, third and fourth embodiments, the invention is obtained by the following raw materials in mass ratio: 15-20 parts of benzofuran, 5-8 parts of pine tar, 5-9 parts of tall oil, 8-12 parts of bioactive powder, 15-20 parts of ionic liquid and 55-65 parts of n-pentane, and the prepared regenerated separating agent is beneficial to improving the oil yield, activating old asphalt, improving the quality of asphalt and facilitating the sustainable recycling of asphalt.
Verification example: road performance inspection of asphalt and aggregate separated by the invention
| Project | Example two | Example III | Example IV |
| Dynamic stability/(sub-mm) -1 ) | 3688 | 3687 | 3689 |
| Freeze thawing split strength ratio/% | 86 | 86.9 | 87.1 |
| Coefficient of water permeability/(mL. Min) -1 ) | Water-impermeable | Water-impermeable | Water-impermeable |
According to the invention, old asphalt particles are obtained by utilizing a crushing means, firstly, the frozen asphalt film on the surfaces of the old asphalt particles is subjected to freezing and centrifugal treatment, so that the asphalt film and aggregate are obtained, the old asphalt particles are used as first separation, then, the asphalt film is melted into a liquid state by heating, so that residual asphalt on the surfaces of the aggregates flows out in a melting way, after solid-liquid separation, unmelted fine materials and asphalt film melt in the asphalt film are obtained, and the aggregates and residual asphalt melt are obtained, so that the old asphalt particles are used as second separation, and the freezing and the heating are matched, so that the residual asphalt in the old asphalt is separated, the separation is more sufficient, the separated aggregates are separated and recovered as coarse materials and separated fine materials, the aggregate classification is finer, and the secondary utilization is facilitated. Before separation, dust and clay on old asphalt concrete blocks are removed by means of spraying water mist and ultrasonic cleaning, after crushing, electromagnetic rollers are inserted into old asphalt particles, the electromagnetic rollers are electrified and eccentrically rotate in a mixing hopper to adsorb out metal impurities in the particles, so that the removal of various impurities in the old asphalt concrete blocks is facilitated, the quality of asphalt and aggregate after separation is prevented from being influenced, and the method is more reliable. Meanwhile, the regenerated separating agent is prepared from benzofuran, pine tar, tall oil, bioactive powder, ionic liquid and n-pentane, and is verified to be beneficial to improving the oil yield, activating old asphalt, improving the quality of asphalt and facilitating sustainable recycling of asphalt.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The method for separating asphalt from aggregate in recycled old asphalt concrete is characterized by comprising the following steps of:
recycling old asphalt concrete blocks, cleaning, screening, and removing dust and clay to obtain recycled asphalt treatment materials;
crushing the treated recycled asphalt treatment material into asphalt old material particles;
stirring old asphalt particles by using an electromagnetic roller, and adsorbing metal impurities in the particles;
freezing old asphalt particles, centrifuging after freezing, enabling asphalt films frozen on the surfaces of the old asphalt particles to fall off by utilizing centrifugal force and friction, and screening to obtain asphalt films and aggregates;
preparing a regenerated separating agent, and preparing the following raw materials in mass ratio: 15-20 parts of benzofuran, 5-8 parts of pine tar, 5-9 parts of tall oil, 8-12 parts of bioactive powder, 15-20 parts of ionic liquid and 55-65 parts of n-pentane, stirring and mixing the raw materials at 30-50 ℃, controlling the rotating speed to be 50-100r/min to obtain a regenerated separating agent, storing at normal temperature, respectively adding the regenerated separating agent into an asphalt film and an aggregate, respectively heating the asphalt film and the aggregate to enable the asphalt film to be melted into a liquid state, and enabling asphalt remained on the surface of the aggregate to flow out in a melting way;
carrying out solid-liquid separation on the melt of the asphalt membrane to separate unmelted fine materials and asphalt membrane melt, and carrying out solid-liquid separation on the aggregate to separate aggregate and residual asphalt melt;
and adding the residual asphalt melt into the asphalt film melt to obtain recycled asphalt, and then respectively recycling and storing the separated aggregate as coarse material and fine material to obtain the aggregate.
2. The method for separating asphalt from aggregate in recycled old asphalt concrete according to claim 1, wherein: spraying water mist to spray and rinse the old asphalt concrete blocks for 30-60min, controlling the temperature at normal temperature, dissolving and flushing dust and clay on the surfaces of the old asphalt concrete blocks, then ultrasonically cleaning the surfaces of the old asphalt concrete blocks by ultrasonic waves, controlling the ultrasonic frequency at 30KHz-60KHz, and removing residual dust and clay again to obtain the recycled asphalt treated material.
3. The method for separating asphalt from aggregate in recycled old asphalt concrete according to claim 2, wherein: crushing the recovered asphalt treatment material by using a crusher, wherein the crushing temperature is controlled at 0 ℃, and crushing the recovered asphalt treatment material into asphalt old material particles with the diameter of 50-90 mm.
4. A method for separating asphalt from aggregate in recycled old asphalt concrete according to claim 3, wherein: pouring old asphalt particles into a mixing hopper, inserting an electromagnetic roller into the old asphalt particles, electrifying the electromagnetic roller and eccentrically rotating in the mixing hopper to adsorb out metal impurities in the particles, controlling the temperature to be normal temperature in the process, and controlling the eccentric rotating speed of the electromagnetic roller to be 30r/min.
5. The method for separating asphalt from aggregate in recycled old asphalt concrete according to claim 4, wherein: freezing the old asphalt particles at-50deg.C to-10deg.C for 10-20min to frost the surfaces of the old asphalt particles, wherein a liquid nitrogen cooler is used for freezing.
6. The method for separating asphalt from aggregate in recycled old asphalt concrete according to claim 5, wherein: centrifuging the frozen old asphalt particles by using a centrifuge, controlling the rotating speed of the centrifuge to be 1500-2000r/min, controlling the centrifuging temperature to be-10-0 ℃, rubbing and falling off the frozen asphalt film on the surfaces of the old asphalt particles, synchronously starting a dust remover, capturing dust with the particle size less than or equal to 0.075mm, centrifuging, screening the centrifuged materials by using a vibrating screen, and separating the asphalt film and aggregate.
7. The method for separating asphalt from aggregate in recycled old asphalt concrete according to claim 6, wherein: adding the regenerated separating agent into the asphalt film and the aggregate respectively, heating the asphalt film and the aggregate respectively by adopting heat radiation, controlling the temperature to be 500-800 ℃, and preserving the heat for 10-15min to enable the asphalt film to be melted into a liquid state, mixing the fine materials in the liquid state, enabling residual asphalt on the surface of the aggregate to be melted and flow out, and mixing the asphalt into the aggregate.
8. The method for separating asphalt from aggregate in recycled old asphalt concrete according to claim 7, wherein: and (3) carrying out solid-liquid separation on the melt of the asphalt membrane by adopting a solid-liquid separator, cleaning, drying and recycling the separated unmelted fine materials, carrying out solid-liquid separation on the aggregate by adopting the solid-liquid separator, and cleaning, drying and recycling the separated aggregate.
9. The method for separating asphalt from aggregate in recycled old asphalt concrete according to claim 8, wherein: adding the residual asphalt melt into the asphalt film melt, storing at a constant temperature of 500-600 ℃ to obtain recycled asphalt, and respectively and intensively storing the separated aggregate as coarse material and fine material at a temperature of 10-25 ℃ to obtain the aggregate.
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| JP2001133595A (en) * | 1999-11-09 | 2001-05-18 | Toshiba Corp | Disposal method for asphalt solidified body |
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| JP2021139101A (en) * | 2020-03-02 | 2021-09-16 | 株式会社Nippo | Manufacturing method and manufacturing device of recycled asphalt mixture |
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| CA1073723A (en) * | 1975-12-31 | 1980-03-18 | Cutler Repaving | Asphalt pavement recycling apparatus |
| CN105440305A (en) * | 2015-11-16 | 2016-03-30 | 江苏云端重工科技有限公司 | Solvent used for separating and recycling asphalt and aggregates of old asphalt mixture used in roads |
| US20180141866A1 (en) * | 2016-11-18 | 2018-05-24 | Stojan Kotefski | Methods for reclaiming or recycling asphalt and asphalt and asphalt components produced thereby |
| CN108330778A (en) * | 2018-03-06 | 2018-07-27 | 南安市达腾商务服务有限公司 | A kind of safety-type bitumen regeneration equipment of favorable regeneration effect for pavement patching |
| CN110523638B (en) * | 2019-07-24 | 2020-10-02 | 福建省铁拓机械股份有限公司 | Method for stripping fine aggregate from surface of waste asphalt mixture aggregate |
| CN110885564B (en) * | 2019-12-05 | 2022-06-17 | 邓棋文 | Hot-recycling asphalt mixture recycling agent |
| CN215593567U (en) * | 2021-12-14 | 2022-01-21 | 新乡格林机械股份有限公司 | Regeneration circulation system for old materials of asphalt pavement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001133595A (en) * | 1999-11-09 | 2001-05-18 | Toshiba Corp | Disposal method for asphalt solidified body |
| CN109736160A (en) * | 2019-03-19 | 2019-05-10 | 成都瑞欣沥青科技有限公司 | A kind of asphalt and aggregate separation method in recycling old asphalt concrete |
| JP2021139101A (en) * | 2020-03-02 | 2021-09-16 | 株式会社Nippo | Manufacturing method and manufacturing device of recycled asphalt mixture |
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