CN117049820A - Asphalt sand mixture of residue of direct coal liquefaction and preparation method thereof - Google Patents
Asphalt sand mixture of residue of direct coal liquefaction and preparation method thereof Download PDFInfo
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- CN117049820A CN117049820A CN202311316449.4A CN202311316449A CN117049820A CN 117049820 A CN117049820 A CN 117049820A CN 202311316449 A CN202311316449 A CN 202311316449A CN 117049820 A CN117049820 A CN 117049820A
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- 239000003245 coal Substances 0.000 title claims abstract description 243
- 239000010426 asphalt Substances 0.000 title claims abstract description 183
- 239000000203 mixture Substances 0.000 title claims abstract description 136
- 239000004576 sand Substances 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 151
- 239000002245 particle Substances 0.000 claims abstract description 80
- 239000011159 matrix material Substances 0.000 claims abstract description 79
- 239000000843 powder Substances 0.000 claims abstract description 70
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 65
- 239000011707 mineral Substances 0.000 claims abstract description 65
- 239000011275 tar sand Substances 0.000 claims abstract description 61
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims description 57
- 238000000034 method Methods 0.000 claims description 27
- 238000012360 testing method Methods 0.000 claims description 26
- 235000019738 Limestone Nutrition 0.000 claims description 22
- 239000006028 limestone Substances 0.000 claims description 22
- 239000002699 waste material Substances 0.000 claims description 21
- 238000010276 construction Methods 0.000 claims description 18
- 239000011269 tar Substances 0.000 claims description 8
- 239000011449 brick Substances 0.000 claims description 4
- 239000004567 concrete Substances 0.000 claims description 4
- 239000012634 fragment Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 239000003607 modifier Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004517 catalytic hydrocracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a coal direct liquefaction residue tar sand mixture and a preparation method thereof, wherein the coal direct liquefaction residue tar sand mixture comprises matrix asphalt, fine aggregates and mineral powder, the particle size of the fine aggregates comprises 2.36mm grade, 1.18mm grade, 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade, and the fine aggregates with the particle size of 2.36mm grade and 1.18mm grade are respectively replaced by coal direct liquefaction residues with the particle size of 2.36mm grade and 1.18mm grade; the preparation method comprises the following steps: preheating each substance; sequentially pouring fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm into a stirrer for stirring; pouring the coal direct liquefaction residues with the particle size of 1.18mm and 2.36mm into a stirrer in sequence for stirring; and sequentially pouring the matrix asphalt and the mineral powder into a stirrer for stirring, thus obtaining the coal direct liquefaction residue asphalt sand mixture. The invention improves the high temperature performance and the low temperature performance of the asphalt sand mixture of the residues of direct coal liquefaction and opens up a new idea for the application of the residues of direct coal liquefaction in an asphalt sand mixture system.
Description
Technical Field
The invention belongs to the technical field of preparation of road building materials, and particularly relates to a coal direct liquefaction residue asphalt sand mixture and a preparation method thereof.
Background
The direct coal liquefaction technology is a process of converting coal into liquid fuel through hydrocracking under the action of hydrogen and a catalyst, however, in the process of preparing oil products by coal liquefaction, direct coal liquefaction residues (Direct coal liquefaction residue, DCLR for short) which are heavy byproducts accounting for about 30% of raw material coal are inevitably produced. The direct coal liquefaction residues are often piled up as garbage or burnt directly as fuel, the utilization rate is low, the environment is polluted, if the direct coal liquefaction residues cannot be effectively utilized, huge resource waste can be generated, and meanwhile, certain negative effects can be generated on the ecological environment.
In the construction and maintenance process of asphalt pavement, the demand for natural sand and stone is large, the cost is high, the yield of the direct liquefaction residues of byproduct coal is large, and the problems of resource waste, environmental pollution and the like can be caused in the piling and discarding process, so that many expert students at home and abroad have conducted research work of applying the direct liquefaction residues of coal to the preparation technology of asphalt pavement materials. The direct coal liquefaction residue is a mixture with complex components, does not contain water, has high carbon, high sulfur and high ash content, has higher heat productivity and stronger cohesiveness, contains heavy oil and asphaltene products which are up to 30-50%, can be used as a modifier of asphalt to improve the performance of the asphalt, and then uses the asphalt modified by the direct coal liquefaction residue to prepare an asphalt mixture. Laboratory studies show that the direct coal liquefaction residues can significantly enhance the high temperature performance and the water damage resistance of the asphalt mixture, but can deteriorate the low temperature performance of the asphalt mixture.
At present, the prior art mainly focuses on the research of directly liquefying coal residues, namely, modifying matrix asphalt by taking the directly liquefying coal residues as a modifier, and preparing asphalt mixture by utilizing the modified matrix asphalt, so that the performance of the asphalt mixture is improved, but the technology for preparing the asphalt mixture by taking directly liquefying coal residues as aggregate or replacing aggregate is not recorded. It is known that asphalt mixture and asphalt sand mixture are two completely different pavement materials, the asphalt mixture mainly consists of coarse aggregate, fine aggregate, mineral powder, asphalt and the like, and is used for preparing pavement layers (such as stress layers), while the asphalt sand mixture mainly consists of fine aggregate, mineral powder, asphalt and the like, and is used for preparing functional layers (such as stress absorbing layers, ultrathin wearing layers, waterproof bonding layers and the like). At present, no report has been found on the technology of modifying matrix asphalt by using coal direct liquefaction residues as a modifier and then preparing an asphalt sand mixture, or the technology of preparing the asphalt sand mixture by using the coal direct liquefaction residues to replace aggregates, so that development of the coal direct liquefaction residues asphalt sand mixture and a preparation method thereof are urgently needed to make up for the technical blank.
The invention patent with the application publication number of CN105174824A discloses a modified asphalt mixture of direct coal liquefaction residues and a preparation method thereof, wherein the asphalt mixture contains 91-95% of aggregate, 1.5-4% of mineral powder and 3-5% of modified asphalt of direct coal liquefaction residues, and the aggregate comprises coarse aggregate and fine aggregate; the preparation method comprises the following steps: testing various performances of the coal direct liquefaction residues, the matrix asphalt, the aggregates and the mineral powder, preparing coal direct liquefaction residues modified asphalt, pretreating the coal direct liquefaction residues modified asphalt, the aggregates and the mineral powder, and mixing the coal direct liquefaction residues modified asphalt, the aggregates and the mineral powder to obtain the coal direct liquefaction residues modified asphalt mixture. According to the technical scheme, instead of the technical scheme that coal is directly liquefied to residue to modify asphalt, and then modified asphalt is used to prepare asphalt mixture, asphalt sand mixture is prepared.
The invention patent with application publication number of CN104591575A discloses a preparation method of modified asphalt cement from residues of direct coal liquefaction, which comprises the following steps: testing various performance indexes of the direct coal liquefaction residues, matrix asphalt and limestone mineral powder; processing the coal direct liquefaction residues to form powdery coal direct liquefaction residues; adding coal direct liquefaction residues with different addition amounts into the matrix asphalt to prepare modified asphalt, and determining the optimal addition amount of the coal direct liquefaction residues; adding limestone mineral powder with different addition amounts into the modified asphalt of the direct coal liquefaction residues to prepare modified asphalt cement, and determining the optimal addition amount of the limestone mineral powder; and adding the coal direct liquefaction residues and limestone mineral powder into the matrix asphalt to prepare the coal direct liquefaction residues modified asphalt cement. The technical scheme is also that asphalt is modified by using coal direct liquefaction residues as a modifier, then asphalt cement and asphalt mixture are prepared, and the technical scheme for preparing asphalt sand mixture by using coal direct liquefaction residues is not adopted.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a coal direct liquefaction residue asphalt sand mixture, which comprises matrix asphalt, fine aggregates and mineral powder, wherein the particle size of the fine aggregates comprises 2.36mm grade, 1.18mm grade, 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade, and the fine aggregates with the particle size of 2.36mm grade and 1.18mm grade in the fine aggregates are respectively replaced by coal direct liquefaction residues with the particle size of 2.36mm grade and 1.18mm grade.
Preferably, each substance in the coal direct liquefaction residue asphalt sand mixture accounts for 9-11wt% of the coal direct liquefaction residue asphalt sand mixture, 72-80wt% of the matrix asphalt and 11-17wt% of the mineral powder.
In any of the above schemes, it is preferable that the mass percentage of the substances with particle diameters of each grade in the fine aggregate is 19-20wt% of the direct coal liquefaction residues with particle diameters of 2.36mm, 12-13wt% of the direct coal liquefaction residues with particle diameters of 1.18mm, 25-27wt% of the fine aggregate with particle diameters of 0.6mm, 18-20wt% of the fine aggregate with particle diameters of 0.3mm, 8-10wt% of the fine aggregate with particle diameters of 0.15mm and 13-14wt% of the fine aggregate with particle diameters of 0.075 mm.
In any of the above schemes, it is preferable that the fine aggregates with the grain sizes of 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade are any one or more of limestone, basalt, natural sand and machine-made sand; the mineral powder is any one or more of limestone, fly ash and construction waste, the particle size of the mineral powder is less than 0.075mm, and the construction waste is waste material obtained by crushing any one or more of concrete blocks, brick fragments, muck and crushed stone; the matrix asphalt is SK-90 asphalt.
The invention also provides a preparation method of the coal direct liquefaction residue tar sand mixture, which is used for preparing any one of the coal direct liquefaction residue tar sand mixture, and comprises the following steps in sequence:
step one: testing various performance indexes of the coal direct liquefaction residues, the matrix asphalt, the fine aggregates and the mineral powder, and ensuring that various performance indexes of the matrix asphalt used for preparing the coal direct liquefaction residues, the asphalt and the sand are in accordance with the related technical requirements of the Highway asphalt pavement construction technical Specification and the various performance indexes of the fine aggregates and the mineral powder are in accordance with the related technical requirements of the Highway engineering aggregate test Specification;
step two: respectively weighing direct coal liquefaction residues with the particle sizes of 2.36mm and 1.18mm, fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm, mineral powder and matrix asphalt according to design requirements for later use;
step three: directly liquefying residues of coal with the grain diameters of 2.36mm and 1.18mm are respectively placed into a baking oven for preheating treatment, fine aggregates with the grain diameters of 0.6mm, 0.3mm, 0.15mm and 0.075mm are respectively placed into the baking oven for preheating treatment, and mineral powder and matrix asphalt are respectively placed into the baking oven for preheating treatment;
Step four: after the preheating treatment is finished, sequentially pouring fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm into a stirrer, and simultaneously starting the stirrer to stir;
step five: after the mixing of the fine aggregates with the grain diameters of 0.6mm, 0.3mm, 0.15mm and 0.075mm is finished, keeping the stirrer in a starting state and improving the stirring speed, and simultaneously pouring the coal liquefaction residues with the grain diameters of 1.18mm into the stirrer for continuous mixing; after the mixing of the direct coal liquefaction residues with the particle size of 1.18mm is finished, keeping the stirrer in a starting state without changing the stirring speed, and simultaneously pouring the direct coal liquefaction residues with the particle size of 2.36mm into the stirrer for continuous mixing;
step six: after the direct coal liquefaction residues with the particle size of 2.36mm are mixed, keeping the stirrer in a starting state, reducing the stirring speed, and simultaneously pouring matrix asphalt into the stirrer for continuous mixing;
step seven: after the matrix asphalt is mixed, keeping the stirrer in a starting state without changing the stirring speed, and pouring mineral powder into the stirrer for primary mixing; standing for a certain time after the first mixing is finished, and then continuing the second mixing; and after the second mixing is finished, the coal direct liquefaction residue asphalt sand mixture can be prepared.
Preferably, in the third step, the preheating treatment temperature of the direct coal liquefaction residues with the particle size of 2.36mm is 150-160 ℃ and the preheating treatment time is 2-3 hours; the preheating treatment temperature of the direct coal liquefaction residues with the grain diameter of 1.18mm is 150-160 ℃ and the preheating treatment time is 1-2h; the preheating treatment temperature of fine aggregates with the grain diameters of 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade is 160-170 ℃ and the preheating treatment time is 4-5h; the preheating treatment temperature of the mineral powder is 160-170 ℃ and the preheating treatment time is 4-5h; the preheating treatment temperature of the matrix asphalt is 160-170 ℃ and the preheating treatment time is 1-2h.
In any of the above schemes, preferably, in the fourth step, the fine aggregates with the grain diameters of 0.6mm, 0.3mm, 0.15mm and 0.075mm are sequentially poured into a stirrer for stirring, wherein the stirring parameters are that the speed of the circumferential motion of the blades of the stirrer around the blade shaft is 75-78r/min, the speed of the circumferential motion of the blades of the stirrer near the inner wall of the stirring pot is 45-48r/min, the stirring temperature is 160-170 ℃, and the stirring time is 60-90s.
In any of the above schemes, preferably, in the fifth step, the coal liquefaction residues with the grain diameter of 1.18mm are poured into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer which do circular motion around the blade shaft is 78-80r/min, the speed of the blades of the stirrer which do circular motion near the inner wall of a stirring pot is 48-50r/min, the stirring temperature is 160-170 ℃, and the stirring time is 60-90s; pouring the coal direct liquefaction residues with the particle size of 2.36mm into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around a blade shaft is 78-80r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of a stirring pot is 48-50r/min, the stirring temperature is 160-170 ℃, and the stirring time is 90-120s.
In any of the above schemes, preferably, in the step six, the matrix asphalt is poured into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around the blade shaft is 75-78r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of the stirring pot is 45-48r/min, the stirring temperature is 160-170 ℃, and the stirring time is 90-120s.
In any of the above schemes, preferably, in the step seven, the mineral powder is poured into a stirrer for stirring, and parameters of the first stirring are that the speed of the circumferential motion of the blades of the stirrer around the blade shaft is 75-78r/min, the speed of the circumferential motion of the blades of the stirrer near the inner wall of the stirring pot is 45-48r/min, the stirring temperature is 160-170 ℃, and the stirring time is 90-120s; standing for 5-10s after the first mixing is finished; the parameters of the secondary mixing are that the speed of the blades of the stirrer doing circular motion around the blade shaft is 75-78r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of the mixing pot is 45-48r/min, the mixing temperature is 160-170 ℃, and the mixing time is 90-120s.
In the present invention, the particle diameters are 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm, that is, the particle diameters are 2.36 to 4.75mm, 1.18 to 2.36mm, 0.6 to 1.18mm, 0.3 to 0.6mm, 0.15 to 0.3mm and 0.075 to 0.15mm, such as: the grain size is 2.36mm grade, namely the material with the grain size between 2.36 and 4.75mm is obtained after the material sequentially passes through 4.75mm sieve holes and 2.36mm sieve holes. The paddle of the stirrer performs circular motion around the paddle shaft, namely, the paddle rotates; the blades of the stirrer do circular motion near the inner wall of the stirring pot, namely the blades revolve.
In the application, the direct coal liquefaction residue is used as a coal-based waste, and has the potential of being used as fine aggregate for preparing the asphalt sand mixture. A large number of experiments prove that the high-temperature performance and the low-temperature performance of the tar sand mixture can be simultaneously improved by applying the direct coal liquefaction residues to the preparation of the tar sand mixture.
In the preparation process of the tar sand mixture, the direct coal liquefaction residues with the particle diameters of 2.36mm and 1.18mm are used for respectively replacing fine aggregates with the same particle diameter grade, and then other raw materials are matched for preparation to obtain the direct coal liquefaction residue tar sand mixture.
The direct coal liquefaction residue may have a mass loss at high temperature, but the mass loss is very small (see a four-component table after the direct coal liquefaction residue is burned out in the embodiment of the application). In order to reduce the quality loss of the direct coal liquefaction residues at high temperature, the direct coal liquefaction residues can fully play the role of aggregates with corresponding particle sizes, so that the prepared tar sand mixture has better high-temperature performance and low-temperature performance, and experiments find that the direct coal liquefaction residues with the particle sizes of 2.36mm and 1.18mm are preheated for 2-3 hours and 1-2 hours respectively, so that the direct coal liquefaction residues can be guaranteed to have good preheating effect, and the prepared tar sand mixture can be guaranteed to have good high-temperature performance and low-temperature performance. Meanwhile, when the coal direct liquefaction residues are mixed, the revolution speed and the rotation speed of the paddles are improved, so that the coal direct liquefaction residues are uniformly dispersed in the tar sand mixture, and the overall performance of the coal direct liquefaction residues tar sand mixture is ensured to be kept stable.
The coal direct liquefaction residue tar sand mixture and the preparation method thereof have the following beneficial effects:
(1) Compared with the tar sand mixture prepared by directly liquefying the residues without using coal, the high-temperature performance of the tar sand mixture prepared by directly liquefying the residues with coal is greatly improved. The test index (dynamic modulus at 40 ℃) for representing the high-temperature performance can be improved by about 50%, because the direct coal liquefaction residues have mass loss at high temperature, the lost direct coal liquefaction residues can enter the matrix asphalt in the mixing process to perform a partial modification effect on the matrix asphalt, so that the high-temperature performance of the direct coal liquefaction residue asphalt sand mixture is greatly improved. Meanwhile, under the proportion of the coal direct liquefaction residues and the preheating time, the mass loss of the coal direct liquefaction residues is extremely small, the supporting effect of the coal direct liquefaction residues serving as fine aggregates in the mixture is basically unchanged, and finally, the coal direct liquefaction residues and tar sand mixture shows excellent high-temperature performance.
(2) Compared with the tar sand mixture prepared by directly liquefying the residues without using coal, the low-temperature performance of the tar sand mixture prepared by directly liquefying the residues with coal is improved. The test index for representing the low-temperature performance (the breaking energy at minus 12 ℃) can be improved by about 8 percent, in the research of the prior art on the modified asphalt of the direct coal liquefaction residues, the direct coal liquefaction residues are directly added into the asphalt as asphalt modifiers, so that the low-temperature performance of the asphalt is greatly reduced, and the direct coal liquefaction residues are used for replacing fine aggregates to prepare the asphalt sand mixture, so that the low-temperature performance of the asphalt sand mixture is effectively improved. This is mainly due to the fact that the mass loss of the direct coal liquefaction residues after preheating is very small, the amount of the residues entering the matrix asphalt is very small, and the adverse effect on the low-temperature performance of the tar sand mixture is very small. Meanwhile, after the coal direct liquefaction residue asphalt sand mixture is preheated, when the coal direct liquefaction residue, the fine aggregate and the matrix asphalt are mixed, the coal direct liquefaction residue has certain viscosity at high temperature, the part of the coal direct liquefaction residue entering the matrix asphalt can obviously improve the viscosity of the matrix asphalt, the fine aggregate-matrix asphalt-coal direct liquefaction residue has excellent adhesion between every two, the improved adhesion is a main factor for improving the low-temperature performance of the asphalt sand mixture, and finally, the coal direct liquefaction residue asphalt sand mixture shows better low-temperature performance.
(3) According to the invention, the direct coal liquefaction residues are directly used for replacing fine aggregates in the preparation of the tar sand mixture, so that the economy in the direct coal liquefaction process can be improved, the environmental protection problem caused by the direct coal liquefaction process is solved, the exploitation of natural sand and the damage to the ecological environment can be reduced, the application of the direct coal liquefaction residues in road engineering and the resource fusion of coal and traffic industries are promoted, and the method has remarkable economic and social benefits.
(4) The invention opens up a new idea for the application of the direct coal liquefaction residues in the asphalt sand mixture system, improves the utilization rate of the direct coal liquefaction residues in road surface engineering, and has important significance for promoting the recycling of the direct coal liquefaction residues.
Drawings
FIG. 1 is a process flow diagram of a preferred embodiment of a coal direct liquefaction residue tar sands blend and method of making the same according to the present invention;
FIG. 2 is a photograph of a coal direct liquefaction residue of the embodiment of FIG. 1, wherein: (a) A direct coal liquefaction residue with a particle size of 2.36mm, and (b) a direct coal liquefaction residue with a particle size of 1.18 mm;
fig. 3 is a photograph of a real object of the fine aggregate (limestone) in the embodiment shown in fig. 1, wherein: (a) fine aggregate having a particle size of 0.6mm, (b) fine aggregate having a particle size of 0.3mm, (c) fine aggregate having a particle size of 0.15mm, and (d) fine aggregate having a particle size of 0.075 mm;
FIG. 4 is a photograph of the embodiment of FIG. 1 showing the ore powder (construction waste material);
FIG. 5 is a photograph of a mixture of coal directly liquefying residual tar sands prepared in the example shown in FIG. 1;
FIG. 6 is a photograph of a real object of the ore powder (limestone) in another preferred embodiment of the coal direct liquefaction residue tar sands mix and method of preparing the same according to the present invention;
FIG. 7 is a photograph of the 40℃dynamic modulus test procedure for three examples and comparative examples;
FIG. 8 is a photograph of a semicircular bending (SCB) test procedure of three examples and comparative examples;
FIG. 9 is a graph of 40℃dynamic modulus for three examples and comparative examples;
fig. 10 is a graph of-12 ℃ breaking energy for three examples and comparative examples;
fig. 11 is a graph of-12 ℃ stiffness for three examples and comparative examples.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the following examples.
Embodiment one:
according to a preferred embodiment of the coal direct liquefaction residue tar sand mixture of the present invention, the asphalt direct liquefaction residue tar sand mixture comprises base asphalt, fine aggregates and mineral powder, wherein the particle size of the fine aggregates comprises 2.36mm grade, 1.18mm grade, 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade, and the fine aggregates with the particle sizes of 2.36mm grade and 1.18mm grade are respectively replaced by coal direct liquefaction residues with the particle sizes of 2.36mm grade and 1.18mm grade.
The mass percentage of each substance in the coal direct liquefaction residue asphalt sand mixture is 9wt% of matrix asphalt, 80wt% of fine aggregate and 11wt% of mineral powder.
The mass percentage of the substances with the grain diameter of each grade in the fine aggregate is 20 percent by weight of coal direct liquefaction residues with the grain diameter of 2.36mm, 13 percent by weight of coal direct liquefaction residues with the grain diameter of 1.18mm, 25 percent by weight of fine aggregate with the grain diameter of 0.6mm, 20 percent by weight of fine aggregate with the grain diameter of 0.3mm, 8 percent by weight of fine aggregate with the grain diameter of 0.15mm and 14 percent by weight of fine aggregate with the grain diameter of 0.075 mm.
The fine aggregates with the grain diameters of 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade are limestone; the mineral powder is construction waste material with the particle size smaller than 0.075mm, and the construction waste material is waste material obtained by crushing concrete blocks, brick fragments and slag soil; the matrix asphalt is SK-90 asphalt.
As shown in fig. 1, this embodiment also provides a method for preparing a coal direct liquefaction residue tar sand mixture, which is used for preparing any one of the above coal direct liquefaction residue tar sand mixtures, and includes the following steps in order:
Step one: testing various performance indexes of the coal direct liquefaction residues, the matrix asphalt, the fine aggregates and the mineral powder, and ensuring that various performance indexes of the matrix asphalt used for preparing the coal direct liquefaction residues, the asphalt and the sand are in accordance with the related technical requirements of the Highway asphalt pavement construction technical Specification and the various performance indexes of the fine aggregates and the mineral powder are in accordance with the related technical requirements of the Highway engineering aggregate test Specification;
step two: respectively weighing direct coal liquefaction residues with the particle sizes of 2.36mm and 1.18mm, fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm, mineral powder and matrix asphalt according to design requirements for later use;
step three: directly liquefying residues of coal with the grain diameters of 2.36mm and 1.18mm are respectively placed into a baking oven for preheating treatment, fine aggregates with the grain diameters of 0.6mm, 0.3mm, 0.15mm and 0.075mm are respectively placed into the baking oven for preheating treatment, and mineral powder and matrix asphalt are respectively placed into the baking oven for preheating treatment;
step four: after the preheating treatment is finished, sequentially pouring fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm into a stirrer, and simultaneously starting the stirrer to stir;
Step five: after the mixing of the fine aggregates with the grain diameters of 0.6mm, 0.3mm, 0.15mm and 0.075mm is finished, keeping the stirrer in a starting state and improving the stirring speed, and simultaneously pouring the coal liquefaction residues with the grain diameters of 1.18mm into the stirrer for continuous mixing; after the mixing of the direct coal liquefaction residues with the particle size of 1.18mm is finished, keeping the stirrer in a starting state without changing the stirring speed, and simultaneously pouring the direct coal liquefaction residues with the particle size of 2.36mm into the stirrer for continuous mixing;
step six: after the direct coal liquefaction residues with the particle size of 2.36mm are mixed, keeping the stirrer in a starting state, reducing the stirring speed, and simultaneously pouring matrix asphalt into the stirrer for continuous mixing;
step seven: after the matrix asphalt is mixed, keeping the stirrer in a starting state without changing the stirring speed, and pouring mineral powder into the stirrer for primary mixing; standing for a certain time after the first mixing is finished, and then continuing the second mixing; and after the second mixing is finished, the coal direct liquefaction residue asphalt sand mixture can be prepared.
In the first step, various performance indexes of matrix asphalt, direct coal liquefaction residues, fine aggregates and mineral powder are tested, and test results are shown in tables 1-6.
From the above test results, it can be seen that the various performance indexes of the matrix asphalt (SK-90 asphalt) meet the related technical requirements of the Highway asphalt pavement construction technical Specification, and the various performance indexes of the fine aggregate (limestone) and the mineral powder (construction waste) meet the related technical requirements of the Highway engineering aggregate test Specification. In table 3, the test method of four components after burning loss of the direct coal liquefaction residue at 170 ℃ is referred to NB/SH/T0509-2010, the colloid instability factor ic= (asphaltene+saturated fraction)/(aromatic fraction+colloid).
In this example, a physical photograph of the direct coal liquefaction residue is shown in fig. 2, wherein: (a) A direct coal liquefaction residue with a particle size of 2.36mm, and (b) a direct coal liquefaction residue with a particle size of 1.18 mm. A physical photograph of the fine aggregate (limestone) is shown in fig. 3, in which: (a) fine aggregate having a particle size of 0.6mm, (b) fine aggregate having a particle size of 0.3mm, (c) fine aggregate having a particle size of 0.15mm, and (d) fine aggregate having a particle size of 0.075 mm. A photograph of the ore powder (construction waste material) is shown in fig. 4.
In the third step, the preheating treatment temperature of the direct coal liquefaction residues with the grain diameter of 2.36mm is 155 ℃ and the preheating treatment time is 2.5h; the preheating treatment temperature of the direct coal liquefaction residues with the grain diameter of 1.18mm is 155 ℃ and the preheating treatment time is 1.5h; the preheating treatment temperature of the fine aggregates with the grain diameters of 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade is 165 ℃ and the preheating treatment time is 4.5h; the preheating treatment temperature of the mineral powder is 165 ℃ and the preheating treatment time is 4.5 hours; the preheating treatment temperature of the matrix asphalt is 165 ℃ and the preheating treatment time is 1.5h.
And in the fourth step, sequentially pouring the fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around the blade shaft is 76r/min, the speed of the blades of the stirrer doing circular motion close to the inner wall of a stirring pot is 46r/min, the stirring temperature is 165 ℃, and the stirring time is 75s.
Pouring the coal direct liquefaction residues with the particle size of 1.18mm into a stirrer for stirring, wherein the stirring parameters are that the speed of the circumferential motion of a blade of the stirrer around a blade shaft is 79r/min, the speed of the circumferential motion of the blade of the stirrer near the inner wall of a stirring pot is 49r/min, the stirring temperature is 165 ℃, and the stirring time is 75s; the coal direct liquefaction residues with the grain diameter of 2.36mm are poured into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around a blade shaft is 79r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of a stirring pot is 49r/min, the stirring temperature is 165 ℃, and the stirring time is 105s.
And step six, pouring the matrix asphalt into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around the blade shaft is 76r/min, the speed of the blades of the stirrer doing circular motion close to the inner wall of the stirring pot is 46r/min, the stirring temperature is 165 ℃, and the stirring time is 105s.
Pouring mineral powder into a stirrer for stirring, wherein the parameters of the first stirring are that the speed of the circular motion of a blade of the stirrer around a blade shaft is 76r/min, the speed of the circular motion of the blade of the stirrer close to the inner wall of a stirring pot is 46r/min, the stirring temperature is 165 ℃, and the stirring time is 105s; after the first mixing is finished, standing for 8s; the parameters of the second mixing are that the speed of the blades of the stirrer doing circular motion around the blade shaft is 76r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of the mixing pot is 46r/min, the mixing temperature is 165 ℃, and the mixing time is 105s.
In this example, particle diameters of 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm are mentioned, i.e., particle diameters of 2.36-4.75mm, 1.18-2.36mm, 0.6-1.18mm, 0.3-0.6mm, 0.15-0.3mm and 0.075-0.15mm. The paddle of the stirrer performs circular motion around the paddle shaft, namely, the paddle rotates; the blades of the stirrer do circular motion near the inner wall of the stirring pot, namely the blades revolve.
In the embodiment, the direct coal liquefaction residues are used as coal-based waste, and have the potential of being used as fine aggregates for preparing asphalt sand mixtures. A large number of experiments prove that the high-temperature performance and the low-temperature performance of the tar sand mixture can be simultaneously improved by applying the direct coal liquefaction residues to the preparation of the tar sand mixture. In the whole preparation process of the coal direct liquefaction residue tar sand mixture, the mass percent of each component, the addition sequence of each component, the technological parameters of each step, the secondary mixing process of mineral powder and the like are very critical, and only the synergistic effect of each parameter can achieve the expected technical effect of the embodiment. A physical photograph of the coal direct liquefaction residue tar sand mixture prepared in this example is shown in FIG. 5.
The coal direct liquefaction residue tar sand mixture and the preparation method thereof have the following beneficial effects:
(1) The high-temperature performance of the coal direct liquefaction residue tar sand mixture prepared by the embodiment is greatly improved, and the quality loss of the coal direct liquefaction residue at high temperature is caused, so that the lost coal direct liquefaction residue can enter the matrix asphalt in the mixing process to perform a partial modification effect on the matrix asphalt, and the high-temperature performance of the coal direct liquefaction residue tar sand mixture is greatly improved. Meanwhile, under the proportion of the coal direct liquefaction residues and the preheating time, which are designed in the embodiment, the mass loss of the coal direct liquefaction residues is extremely small, the supporting effect of the coal direct liquefaction residues serving as fine aggregates in the mixture is basically unchanged, and finally, the coal direct liquefaction residues and the tar sand mixture show excellent high-temperature performance.
(2) In the research on the modified asphalt of the direct coal liquefaction residues in the prior art, the direct coal liquefaction residues are directly added into the asphalt as asphalt modifiers, so that the low-temperature performance of the asphalt is greatly reduced, and the direct coal liquefaction residues are used for replacing fine aggregates to prepare the asphalt sand mixture, so that the low-temperature performance of the asphalt sand mixture is effectively improved. This is mainly due to the fact that the mass loss of the direct coal liquefaction residues after preheating is very small, the amount of the residues entering the matrix asphalt is very small, and the adverse effect on the low-temperature performance of the tar sand mixture is very small. Meanwhile, after the coal direct liquefaction residue asphalt sand mixture is preheated, when the coal direct liquefaction residue, the fine aggregate and the matrix asphalt are mixed, the coal direct liquefaction residue has certain viscosity at high temperature, the part of the coal direct liquefaction residue entering the matrix asphalt can obviously improve the viscosity of the matrix asphalt, the fine aggregate-matrix asphalt-coal direct liquefaction residue has excellent adhesion between every two, the improved adhesion is a main factor for improving the low-temperature performance of the asphalt sand mixture, and finally, the coal direct liquefaction residue asphalt sand mixture shows better low-temperature performance.
(3) According to the embodiment, the direct coal liquefaction residues are directly used for replacing fine aggregates in the preparation of the tar sand mixture, so that the economical efficiency of the direct coal liquefaction process can be improved, the environmental protection problem caused by the direct coal liquefaction process is solved, the exploitation of natural sand and the damage to the ecological environment can be reduced, the application of the direct coal liquefaction residues in road engineering and the resource fusion of coal and traffic industries are promoted, and obvious economic and social benefits are achieved.
(4) The embodiment opens up a new idea for the application of the direct coal liquefaction residues in the asphalt sand mixture system, improves the utilization rate of the direct coal liquefaction residues in road surface engineering, and has important significance for promoting the recycling of the direct coal liquefaction residues.
Embodiment two:
according to another preferred embodiment of the direct coal liquefaction residue tar sand mixture of the present invention, the formulation, preparation method, equipment used, technical principle and beneficial effects of the tar sand mixture are substantially the same as those of the first embodiment, except that:
(1) Asphalt sand mixture for direct coal liquefaction residues
The mass percentage of each substance in the coal direct liquefaction residue asphalt sand mixture is that the matrix asphalt accounts for 11wt%, the fine aggregate accounts for 72wt% and the mineral powder accounts for 17wt%.
The mass percentage of the substances with the grain diameter of each grade in the fine aggregate is 19wt% of coal direct liquefaction residues with the grain diameter of 2.36mm, 12wt% of coal direct liquefaction residues with the grain diameter of 1.18mm, 27wt% of fine aggregate with the grain diameter of 0.6mm, 18wt% of fine aggregate with the grain diameter of 0.3mm, 10wt% of fine aggregate with the grain diameter of 0.15mm and 14wt% of fine aggregate with the grain diameter of 0.075 mm.
The fine aggregates with the grain diameters of 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade are limestone; the mineral powder is limestone, and the particle size of the mineral powder is smaller than 0.075mm; the matrix asphalt is SK-90 asphalt.
(2) Preparation method of residue asphalt sand mixture for direct coal liquefaction
In the first step, the performance test results of the ore powder (limestone) are shown in table 7.
From the above table, it can be seen that each performance index of the mineral powder (limestone) meets the related technical requirements of the highway engineering aggregate test procedure. In this example, a photograph of a real object of the ore powder (limestone) is shown in fig. 6.
In the third step, the preheating treatment temperature of the direct coal liquefaction residues with the particle size of 2.36mm is 160 ℃ and the preheating treatment time is 2 hours; the preheating treatment temperature of the direct coal liquefaction residues with the grain diameter of 1.18mm is 160 ℃, and the preheating treatment time is 1h; the preheating treatment temperature of the fine aggregates with the grain diameters of 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade is 170 ℃ and the preheating treatment time is 4 hours; the preheating treatment temperature of the mineral powder is 170 ℃ and the preheating treatment time is 4 hours; the preheating treatment temperature of the matrix asphalt is 170 ℃ and the preheating treatment time is 1h.
And in the fourth step, sequentially pouring the fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around a blade shaft is 78r/min, the speed of the blades of the stirrer doing circular motion close to the inner wall of a stirring pot is 48r/min, the stirring temperature is 170 ℃, and the stirring time is 60s.
Pouring the coal direct liquefaction residues with the particle size of 1.18mm into a stirrer for stirring, wherein the stirring parameters are that the speed of the circumferential motion of a blade of the stirrer around a blade shaft is 80r/min, the speed of the circumferential motion of the blade of the stirrer near the inner wall of a stirring pot is 50r/min, the stirring temperature is 170 ℃, and the stirring time is 60s; the coal direct liquefaction residues with the grain diameter of 2.36mm are poured into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around a blade shaft is 80r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of a stirring pot is 50r/min, the stirring temperature is 170 ℃, and the stirring time is 90s.
And step six, pouring the matrix asphalt into a stirrer for stirring, wherein the stirring parameters are that the speed of the circumferential motion of a blade of the stirrer around a blade shaft is 78r/min, the speed of the circumferential motion of the blade of the stirrer near the inner wall of a stirring pot is 48r/min, the stirring temperature is 170 ℃, and the stirring time is 90s.
Pouring mineral powder into a stirrer for stirring, wherein the parameters of the first stirring are that the speed of the circular motion of a blade of the stirrer around a blade shaft is 78r/min, the speed of the circular motion of the blade of the stirrer near the inner wall of a stirring pot is 48r/min, the stirring temperature is 170 ℃, and the stirring time is 90s; after the first mixing is finished, standing for 10s; the parameters of the second mixing are that the speed of the blades of the stirrer doing circular motion around the blade shaft is 78r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of the mixing pot is 48r/min, the mixing temperature is 170 ℃, and the mixing time is 90s.
Embodiment III:
according to another preferred embodiment of the direct coal liquefaction residue tar sand mixture of the present invention, the formulation, preparation method, equipment used, technical principle and beneficial effects of the tar sand mixture are substantially the same as those of the first embodiment, except that:
(1) Asphalt sand mixture for direct coal liquefaction residues
The mass percentage of each substance in the coal direct liquefaction residue asphalt sand mixture is that the matrix asphalt accounts for 10wt%, the fine aggregate accounts for 76wt% and the mineral powder accounts for 14wt%.
The mass percentage of the substances with the grain diameter of each grade in the fine aggregate is 19.5wt% of coal direct liquefaction residues with the grain diameter of 2.36mm, 12.5wt% of coal direct liquefaction residues with the grain diameter of 1.18mm, 26.5wt% of fine aggregate with the grain diameter of 0.6mm, 19.5wt% of fine aggregate with the grain diameter of 0.3mm, 9wt% of fine aggregate with the grain diameter of 0.15mm and 13wt% of fine aggregate with the grain diameter of 0.075 mm.
The fine aggregates with the grain diameters of 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade are limestone; the mineral powder is construction waste material with the particle size smaller than 0.075mm, and the construction waste material is waste material obtained by crushing concrete blocks, brick fragments and slag soil; the matrix asphalt is SK-90 asphalt.
(2) Preparation method of residue asphalt sand mixture for direct coal liquefaction
In the third step, the preheating treatment temperature of the direct coal liquefaction residues with the particle size of 2.36mm is 150 ℃ and the preheating treatment time is 3 hours; the preheating treatment temperature of the direct coal liquefaction residues with the grain diameter of 1.18mm is 150 ℃ and the preheating treatment time is 2 hours; the preheating treatment temperature of fine aggregates with the grain diameters of 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade is 160 ℃ and the preheating treatment time is 5 hours; the preheating treatment temperature of the mineral powder is 160 ℃ and the preheating treatment time is 5 hours; the preheating treatment temperature of the matrix asphalt is 160 ℃ and the preheating treatment time is 2 hours.
And in the fourth step, sequentially pouring the fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around a blade shaft is 75r/min, the speed of the blades of the stirrer doing circular motion close to the inner wall of a stirring pot is 45r/min, the stirring temperature is 160 ℃, and the stirring time is 90s.
Pouring the coal direct liquefaction residues with the particle size of 1.18mm into a stirrer for stirring, wherein the stirring parameters are that the speed of the circumferential motion of a blade of the stirrer around a blade shaft is 78r/min, the speed of the circumferential motion of the blade of the stirrer near the inner wall of a stirring pot is 48r/min, the stirring temperature is 160 ℃, and the stirring time is 90s; the coal direct liquefaction residues with the grain diameter of 2.36mm are poured into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around a blade shaft is 78r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of a stirring pot is 48r/min, the stirring temperature is 160 ℃, and the stirring time is 120s.
And step six, pouring the matrix asphalt into a stirrer for stirring, wherein the stirring parameters are that the speed of the circumferential motion of the blades of the stirrer around the blade shaft is 75r/min, the speed of the circumferential motion of the blades of the stirrer near the inner wall of the stirring pot is 45r/min, the stirring temperature is 160 ℃, and the stirring time is 120s.
Pouring mineral powder into a stirrer for stirring, wherein the parameters of the first stirring are that the speed of the circular motion of a blade of the stirrer around a blade shaft is 75r/min, the speed of the circular motion of the blade of the stirrer near the inner wall of a stirring pot is 45r/min, the stirring temperature is 160 ℃, and the stirring time is 120s; after the first mixing is finished, standing for 5s; the parameters of the second mixing are that the speed of the blades of the stirrer doing circular motion around the blade shaft is 75r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of the mixing pot is 45r/min, the mixing temperature is 160 ℃, and the mixing time is 120s.
Comparative example:
the three embodiments adopt the coal direct liquefaction residues to replace fine aggregates with the particle size of 2.36mm and 1.18mm, and simultaneously cooperate with the synergistic effect of all the technological parameters to prepare the coal direct liquefaction residues, the tar sand mixture. In the comparative test, the coal direct liquefaction residues are not used for replacing fine aggregates, and the asphalt sand mixture is prepared by directly using matrix asphalt, fine aggregates with various particle size grades and mineral powder.
The asphalt sand mixture comprises, by mass, 10% of matrix asphalt, 76% of fine aggregates and 14% of mineral powder. The mass percentage of the substances with the grain diameters of each grade in the fine aggregate is that the fine aggregates with the grain diameters of 2.36mm grade, 1.18mm grade, 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade respectively account for 19.5wt%, 12.5wt%, 26wt%, 19wt%, 9.5wt% and 13.5wt%. The fine aggregate and the mineral powder are limestone, the particle size of the mineral powder is smaller than 0.075mm, and the matrix asphalt is SK-90 asphalt. Various performance indexes of limestone and SK-90 asphalt are the same as those of the first embodiment.
The preparation process of the tar sand mixture comprises the following steps: weighing matrix asphalt, fine aggregates with different particle sizes and mineral powder according to the quality requirements, placing the fine aggregates and the mineral powder in a baking oven with the temperature of 165 ℃ for preheating for more than 4 hours, and placing the matrix asphalt in the baking oven with the temperature of 165 ℃ for preheating for 1 hour; after preheating, pouring the fine aggregate into a stirrer to stir for 90s, pouring the matrix asphalt into the stirrer to stir for 90s, and finally pouring the mineral powder into the stirrer to stir for 90s to obtain the asphalt sand mixture. In the stirring process of each working procedure, the speed of the stirring paddle of the stirrer is 47r/min revolution and 76r/min rotation.
The above three examples and comparative examples were subjected to a 40℃dynamic modulus test and a semicircular bending (SCB) test, using the same test equipment, test environment, test conditions, sample shape and size. The high temperature performance of the tar sand mixture can be represented by the 40 ℃ dynamic modulus test result, the low temperature performance of the tar sand mixture can be represented by the semicircle bending (SCB) test result, and the photographs of the test process are shown in fig. 7 and 8 respectively. The 40 ℃ dynamic modulus graph, the-12 ℃ breaking energy graph and the-12 ℃ stiffness graph are shown in figures 9-11 respectively.
As can be seen from fig. 9, the high temperature performance of the coal direct liquefaction residue tar sand mixture of the three examples was significantly better than that of the comparative examples. This is because the fine aggregates used in the tar sand mixture of the comparative example were all limestone, while some of the fine aggregates in the three examples were replaced with direct coal liquefaction residues. The direct coal liquefaction residues have extremely small mass loss in the heating process, and the lost components can enter the matrix asphalt in the stirring process to perform partial modification on the matrix asphalt, so that the high-temperature performance of the tar sand mixture is improved. Meanwhile, the loss quality caused by heating the coal direct liquefaction residues is extremely small, the supporting effect of the coal direct liquefaction residues serving as aggregates in the mixture is not influenced, and finally, the dynamic modulus of the coal direct liquefaction residues asphalt sand mixture of the three embodiments is obviously higher than that of the comparative example. Meanwhile, the high-temperature performance of the first embodiment is the best among the three embodiments, on the one hand, because the amount of the matrix asphalt in the first embodiment is small, and on the other hand, because the substitution amount of the direct coal liquefaction residues in the first embodiment is the largest, both of which can lead to the improvement of the high-temperature performance of the tar sand mixture. Although the mineral powder in example one used construction waste, the high temperature performance of the tar-sand mixture in example one was found to be still the best, which illustrates that the use of construction waste mineral powder is a viable test method.
As can be seen from fig. 10 to 11, the low temperature performance of the coal direct liquefaction residue tar sand mixture of the three examples was improved to a different extent as compared with the comparative examples. The viscosity of the matrix asphalt can be improved due to the fact that a small amount of coal direct liquefaction residues enter the matrix asphalt, so that the aggregate-matrix asphalt-coal direct liquefaction residues have excellent adhesion between every two, the improved adhesion is a main factor for improving the low-temperature performance of the tar sand mixture, and finally, the coal direct liquefaction residues and the tar sand mixture are enabled to show good low-temperature performance. From the test results of fracture energy and rigidity, the low-temperature performance of the tar-sand mixture of the second embodiment is best, and the low-temperature performance of the tar-sand mixture of the first embodiment is equivalent to that of the tar-sand mixture of the third embodiment. On the one hand, the asphalt sand mixture of the second embodiment has a better low-temperature performance as a whole due to the larger amount of matrix asphalt of the asphalt sand mixture of the second embodiment; on the other hand, the blending amount of the direct coal liquefaction residues in the second embodiment is small, and the preheating time of the direct coal liquefaction residues is shortest, so that the amount of the direct coal liquefaction residues in the second embodiment entering the matrix asphalt is obviously lower than that in the first embodiment and the third embodiment, the adverse effect of the direct coal liquefaction residues entering the asphalt on the low-temperature performance of the asphalt is minimized, and the tar sand mixture in the second embodiment finally shows the best low-temperature performance.
The specific description is as follows: the technical scheme of the invention relates to a plurality of parameters, and the beneficial effects and remarkable progress of the invention can be obtained by comprehensively considering the synergistic effect among the parameters. In addition, the value ranges of all the parameters in the technical scheme are obtained through a large number of tests, and aiming at each parameter and the mutual combination of all the parameters, the inventor records a large number of test data, and the specific test data are not disclosed herein for a long period of time.
It will be appreciated by those skilled in the art that the coal direct liquefaction residue tar sands mixture and method of making the same of the present invention includes any combination of the above summary of the invention and detailed description of the invention and the various parts shown in the drawings, is limited in scope and does not describe each of these combinations in any way for brevity. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a direct liquefaction of coal residue tar sand mixture, includes matrix pitch, fine aggregate and powdered ore, the particle diameter of fine aggregate includes 2.36mm shelves, 1.18mm shelves, 0.6mm shelves, 0.3mm shelves, 0.15mm shelves and 0.075mm shelves, its characterized in that: the fine aggregate with the grain diameter of 2.36mm and the grain diameter of 1.18mm in the fine aggregate are respectively replaced by coal direct liquefaction residues with the grain diameter of 2.36mm and the grain diameter of 1.18 mm.
2. The coal direct liquefaction residue tar sands mixture of claim 1, wherein: the mass percentage of each substance in the coal direct liquefaction residue asphalt sand mixture is 9-11wt%, the mass percentage of matrix asphalt is 72-80wt% and the mass percentage of mineral powder is 11-17wt%.
3. The coal direct liquefaction residue tar sands mixture of claim 2, wherein: the mass percentage of each grade of grain diameter substances in the fine aggregate is 19-20wt% of coal direct liquefaction residues with grain diameter of 2.36mm, 12-13wt% of coal direct liquefaction residues with grain diameter of 1.18mm, 25-27wt% of fine aggregate with grain diameter of 0.6mm, 18-20wt% of fine aggregate with grain diameter of 0.3mm, 8-10wt% of fine aggregate with grain diameter of 0.15mm and 13-14wt% of fine aggregate with grain diameter of 0.075 mm.
4. A coal direct liquefaction residue tar sands mixture as recited in claim 3, wherein: the fine aggregates with the grain diameters of 0.6mm, 0.3mm, 0.15mm and 0.075mm are any one or more of limestone, basalt, natural sand and machine-made sand; the mineral powder is any one or more of limestone, fly ash and construction waste, the particle size of the mineral powder is less than 0.075mm, and the construction waste is waste material obtained by crushing any one or more of concrete blocks, brick fragments, muck and crushed stone; the matrix asphalt is SK-90 asphalt.
5. A preparation method of a coal direct liquefaction residue tar sand mixture is characterized by comprising the following steps: a process for preparing the mixture of tar sands containing residues from direct liquefaction of coal as claimed in any one of claims 1 to 4, comprising, in succession,
step one: testing various performance indexes of the coal direct liquefaction residues, the matrix asphalt, the fine aggregates and the mineral powder, and ensuring that various performance indexes of the matrix asphalt used for preparing the coal direct liquefaction residues, the asphalt and the sand are in accordance with the related technical requirements of the Highway asphalt pavement construction technical Specification and the various performance indexes of the fine aggregates and the mineral powder are in accordance with the related technical requirements of the Highway engineering aggregate test Specification;
step two: respectively weighing direct coal liquefaction residues with the particle sizes of 2.36mm and 1.18mm, fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm, mineral powder and matrix asphalt according to design requirements for later use;
step three: directly liquefying residues of coal with the grain diameters of 2.36mm and 1.18mm are respectively placed into a baking oven for preheating treatment, fine aggregates with the grain diameters of 0.6mm, 0.3mm, 0.15mm and 0.075mm are respectively placed into the baking oven for preheating treatment, and mineral powder and matrix asphalt are respectively placed into the baking oven for preheating treatment;
Step four: after the preheating treatment is finished, sequentially pouring fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm into a stirrer, and simultaneously starting the stirrer to stir;
step five: after the mixing of the fine aggregates with the grain diameters of 0.6mm, 0.3mm, 0.15mm and 0.075mm is finished, keeping the stirrer in a starting state and improving the stirring speed, and simultaneously pouring the coal liquefaction residues with the grain diameters of 1.18mm into the stirrer for continuous mixing; after the mixing of the direct coal liquefaction residues with the particle size of 1.18mm is finished, keeping the stirrer in a starting state without changing the stirring speed, and simultaneously pouring the direct coal liquefaction residues with the particle size of 2.36mm into the stirrer for continuous mixing;
step six: after the direct coal liquefaction residues with the particle size of 2.36mm are mixed, keeping the stirrer in a starting state, reducing the stirring speed, and simultaneously pouring matrix asphalt into the stirrer for continuous mixing;
step seven: after the matrix asphalt is mixed, keeping the stirrer in a starting state without changing the stirring speed, and pouring mineral powder into the stirrer for primary mixing; standing for a certain time after the first mixing is finished, and then continuing the second mixing; and after the second mixing is finished, the coal direct liquefaction residue asphalt sand mixture can be prepared.
6. The method for preparing the coal direct liquefaction residue tar sand mixture according to claim 5, wherein the method comprises the following steps: step three, preheating the direct coal liquefaction residues with the particle size of 2.36mm at 150-160 ℃ for 2-3 hours; the preheating treatment temperature of the direct coal liquefaction residues with the grain diameter of 1.18mm is 150-160 ℃ and the preheating treatment time is 1-2h; the preheating treatment temperature of fine aggregates with the grain diameters of 0.6mm grade, 0.3mm grade, 0.15mm grade and 0.075mm grade is 160-170 ℃ and the preheating treatment time is 4-5h; the preheating treatment temperature of the mineral powder is 160-170 ℃ and the preheating treatment time is 4-5h; the preheating treatment temperature of the matrix asphalt is 160-170 ℃ and the preheating treatment time is 1-2h.
7. The method for preparing the coal direct liquefaction residue tar sand mixture according to claim 6, wherein the method comprises the following steps: and step four, sequentially pouring fine aggregates with the particle sizes of 0.6mm, 0.3mm, 0.15mm and 0.075mm into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around a blade shaft is 75-78r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of a stirring pot is 45-48r/min, the stirring temperature is 160-170 ℃, and the stirring time is 60-90s.
8. The method for preparing the coal direct liquefaction residue tar sand mixture according to claim 7, wherein: pouring the coal direct liquefaction residues with the particle size of 1.18mm into a stirrer for stirring, wherein the stirring parameters are that the speed of the circumferential motion of a blade of the stirrer around a blade shaft is 78-80r/min, the speed of the circumferential motion of the blade of the stirrer near the inner wall of a stirring pot is 48-50r/min, the stirring temperature is 160-170 ℃, and the stirring time is 60-90s; pouring the coal direct liquefaction residues with the particle size of 2.36mm into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around a blade shaft is 78-80r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of a stirring pot is 48-50r/min, the stirring temperature is 160-170 ℃, and the stirring time is 90-120s.
9. The method for preparing the coal direct liquefaction residue tar sand mixture according to claim 8, wherein the method comprises the following steps: and step six, pouring the matrix asphalt into a stirrer for stirring, wherein the stirring parameters are that the speed of the blades of the stirrer doing circular motion around the blade shaft is 75-78r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of the stirring pot is 45-48r/min, the stirring temperature is 160-170 ℃, and the stirring time is 90-120s.
10. The method for preparing the coal direct liquefaction residue tar sand mixture according to claim 9, wherein: pouring mineral powder into a stirrer for stirring, wherein the parameters of the first stirring are that the speed of the circular motion of a blade of the stirrer around a blade shaft is 75-78r/min, the speed of the circular motion of the blade of the stirrer near the inner wall of a stirring pot is 45-48r/min, the stirring temperature is 160-170 ℃, and the stirring time is 90-120s; standing for 5-10s after the first mixing is finished; the parameters of the secondary mixing are that the speed of the blades of the stirrer doing circular motion around the blade shaft is 75-78r/min, the speed of the blades of the stirrer doing circular motion near the inner wall of the mixing pot is 45-48r/min, the mixing temperature is 160-170 ℃, and the mixing time is 90-120s.
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