CN115259710A - Artificial aggregate based on lithium slag, preparation method thereof and asphalt mixture - Google Patents
Artificial aggregate based on lithium slag, preparation method thereof and asphalt mixture Download PDFInfo
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- CN115259710A CN115259710A CN202211027777.8A CN202211027777A CN115259710A CN 115259710 A CN115259710 A CN 115259710A CN 202211027777 A CN202211027777 A CN 202211027777A CN 115259710 A CN115259710 A CN 115259710A
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- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
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- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/144—Slags from the production of specific metals other than iron or of specific alloys, e.g. ferrochrome slags
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- 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
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
Abstract
The invention discloses an artificial aggregate based on lithium slag, a preparation method thereof and an asphalt mixture, wherein the artificial aggregate based on the lithium slag comprises the lithium slag, an alkali activator and a cementing material, wherein the weight ratio of the lithium slag to the cementing material is (1.5-3.0): 1, the volume of the alkali-activator and the total weight ratio of the lithium slag and the cementing material are (0.28-0.32) ml:1g of a compound; the alkali activator comprises-OH and-SiO 3 Wherein the content of-OH is 2.0 mol/L-3.2 mol/L, and the-SiO 3 The content of (b) is 3.6mol/L to 4.7mol/L. The invention can improve the utilization rate of the lithium slag, save the use proportion of natural aggregates in the asphalt mixture, reduce the energy consumption and carbon emission in the production process of the asphalt mixture and realize the sustainable development of the society.
Description
Technical Field
The invention belongs to the technical field of aggregates, and particularly relates to an artificial aggregate based on lithium slag, a preparation method of the artificial aggregate and an asphalt mixture.
Background
The development of new energy automobiles promotes the exploitation and utilization of lithium ores, a factory can generate a large amount of lithium slag in the process of extracting lithium salts, and according to actual investigation: approximately 30 tons of lithium slag are produced per ton of lithium carbonate produced. The traditional lithium slag treatment method is open-air storage and landfill, which not only occupies land resources, but also threatens the safety of the surrounding environment and underground water resources.
In 2020, china puts forward the targets of 'carbon peak reaching' and 'carbon neutralization', the carbon emission generated by the exploitation and utilization of a large amount of resources in the construction of highway infrastructures in the field of transportation is concerned by the industry, and the feasibility of recycling lithium slag as a waste material in asphalt pavements is demonstrated. However, due to the limitation of the diameter of the lithium slag (< 2.36 mm), the lithium slag in the asphalt mixture with different specifications is often used as fine aggregate or filler, and the use ratio is 5-10%. Therefore, at present, although the lithium slag can be utilized in the asphalt mixture, the problem of a large amount of lithium slag generated in the current industrial production process is difficult to solve due to low utilization rate. In addition, considering the problem of long-distance transportation cost for use across regions, the use of lithium slag is limited by the region range. In order to improve the utilization rate of the lithium slag as much as possible in a specific area and reduce the influence of the lithium slag on the environment, how to further improve the use ratio of the lithium slag in the asphalt mixture becomes a problem to be solved urgently at present.
By analyzing the composition characteristics of the asphalt mixture, the lithium slag mainly comprises coarse aggregates, fine aggregates, fillers and asphalt, so that in order to improve the use proportion of the lithium slag in the asphalt mixture, the use particle size of the lithium slag is firstly changed, and the lithium slag can be used as part of the coarse aggregates for the asphalt mixture. The artificial aggregate is formed by aggregating powdery materials such as industrial solid waste, construction waste dust and the like, increasing the particle size to form aggregate, and then achieving the expected strength through later strengthening treatment, so that the artificial aggregate partially or completely replaces natural aggregate, and the sustainable development of the aggregate is indirectly promoted. However, in the current research on artificial aggregates, no research on artificial aggregates of lithium slag has been found, and no research on the feasibility of making artificial aggregates of lithium slag for asphalt mixtures has been found. Therefore, artificial aggregate based on lithium slag is urgently needed to be provided, feasibility of the artificial aggregate when the artificial aggregate is used for replacing coarse aggregate in asphalt mixture is proved, and the problem of efficient utilization of the lithium slag is solved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the artificial aggregate based on the lithium slag, the preparation method thereof and the asphalt mixture, which can improve the utilization rate of the lithium slag, save the use proportion of the natural aggregate in the asphalt mixture, reduce the energy consumption and carbon emission in the production process of the asphalt mixture and realize the sustainable development of the society.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the artificial aggregate based on the lithium slag comprises the lithium slag, an alkali activator and a cementing material, wherein the weight ratio of the lithium slag to the cementing material is (1.5-3.0): 1, the volume of the alkali activator and the total weight ratio of the lithium slag and the cementing material are (0.28-0.32) ml:1g of a compound; the alkali activator comprises-OH and-SiO 3 Wherein the content of-OH is 2.0 mol/L-3.2 mol/L, and the-SiO 3 The content of (b) is 3.6mol/L to 4.7mol/L.
Further, the lithium slag is at least one of lepidolite lithium slag and spodumene lithium slag.
Further, the alkali activator is a mixed solution of a sodium hydroxide solution and/or a potassium hydroxide solution and a sodium silicate solution.
Further, the cementing material is at least one of kaolin, cement, blast furnace slag, bentonite and diatomite.
A preparation method of artificial aggregate based on lithium slag comprises the following steps:
uniformly mixing the dried lithium slag with the cementing material to obtain a powder system;
putting the powder system into granulation equipment, starting the granulation equipment, and spraying the alkali activator to the powder system for granulation to obtain a particle system;
and curing the particle system under set conditions to obtain the artificial aggregate.
Further, the granulating equipment is a disk granulator; when the alkali activator is sprayed to the powder system, the included angle between the disc of the disc granulator and the normal is 35-50 degrees, and the rotating speed of the disc granulator is 40-60 r/min.
Further, when the alkali activator is sprayed to the powder system, a spray type spraying manner is adopted.
Furthermore, the granulation time is 15min to 20min.
Further, the maintaining the particle system under the set condition specifically includes:
the curing temperature is 20-30 ℃, the relative humidity is 80-90%, and the curing time is 14-28 days.
The asphalt mixture comprises the artificial aggregate, the natural mineral powder, the natural aggregate and asphalt, wherein the artificial aggregate accounts for 40-90% of the weight of the asphalt mixture, the natural mineral powder accounts for 3-8% of the weight of the asphalt mixture, the natural aggregate accounts for 0-50% of the weight of the asphalt mixture, and the asphalt accounts for 4-6% of the weight of the asphalt mixture.
Compared with the prior art, the invention at least has the following beneficial effects:
the artificial aggregate based on the lithium slag provided by the invention is prepared by mixing the lithium slag with a cementing material,the invention can prepare artificial aggregates with different particle sizes, realizes the full utilization of the lithium slag material, improves the utilization rate of the lithium slag material in the asphalt mixture to a certain extent, can improve the problem of insufficient natural aggregates in the road construction process, embodies the environment-friendly concept of green sustainable development, and is beneficial to realizing the aim of double carbon. Specifically, in the previous research, lithium slag is a waste material, which causes pollution to soil, water resources and the like, and in order to effectively utilize the lithium slag, the lithium slag is often directly mixed into the asphalt mixture and is affected by the particle size of the lithium slag, the lithium slag in the asphalt mixture is often used as fine aggregates or fillers, and the use ratio of the lithium slag in the asphalt mixture is 5% -10% due to the limited use ratio of the fine aggregates in the asphalt mixture, and the use ratio is low. In order to improve the utilization rate of the lithium slag in the asphalt mixture, the invention provides the artificial aggregate based on the lithium slag, which can be used for preparing artificial aggregates containing the lithium slag with different grain diameters, and the artificial aggregates can replace the use proportion of natural aggregates with different grain diameters in the asphalt mixture, thereby achieving the purpose of improving the use proportion of the lithium slag in the asphalt mixture. According to the invention, the cementing material is mixed with the lithium slag, and the alkali activator is added to ensure that the cementing material and the lithium slag generate hydration, so that the strength of the artificial aggregate is ensured to meet the application requirement in engineering. The main component of the lithium slag is SiO 2 、Al 2 O 3 、CaO、Na 2 O、K 2 O、Fe 2 O 3 And SO 3 The content ratio of Ca, al and Si is less than 1, so that SiO in the lithium slag 2 、Al 2 O 3 The Al-Si phase precursor material can be decomposed into Al-Si monomer structural units under the action of an alkali activator, and then a new Al-Si unit is formed through polymerization reaction. However, due to the limitation of low content of the components, the use of the cementing material improves SiO in the lithium slag 2 、Al 2 O 3 The content of the aluminum-silicon phase precursor material is equal, so that the precursor material is decomposed into more aluminum-silicon monomer structural units under the action of an alkali activator and is subjected to polymerization reaction to form more new aluminum-silicon units, and the aluminum-silicon units in the particles are continuously recombined to generate new polymer condensateGlue, thereby remarkably improving the strength of the artificial aggregate. The cementing material contains a large amount of SiO with strong activity 2 、Al 2 O 3 And (3) waiting for aluminum-silicon phase materials. The invention is simple and practical, the granulation speed is high, the particle size can meet the requirements of various particle sizes used by the asphalt mixture, and the prepared artificial aggregate can form high strength after being maintained for 14-28 days. After the artificial aggregate with good strength is obtained after maintenance, grading is carried out by a screening method, the mix proportion design of the asphalt mixture with different grading types can be carried out according to the actual mixing amount requirement, and then the performance of the corresponding asphalt mixture is tested.
The invention adopts a mechanical granulation technology to form the artificial aggregate containing the cementing material, the lithium slag and the alkali activator, and the artificial aggregate can form different particle sizes by adjusting different granulation parameters. And then, maintaining the artificial aggregates with different particle sizes, promoting the hydration of the cementing materials and the lithium slag in the artificial aggregates, and further forming polymer gel to enable the artificial aggregates to achieve higher strength.
In conclusion, the invention can fully utilize the waste lithium slag resources, realize the purposes of recycling resources, saving energy and reducing emission, simultaneously mix the lithium slag with the cementing material and the alkali activator, and prepare the lithium slag with higher strength and different grain diameters for the asphalt mixture through hydration and polymerization, thereby reducing the requirement on natural aggregates in the asphalt mixture, improving the utilization rate of the lithium slag in the asphalt mixture, and ensuring that the service performance of the asphalt mixture meets the engineering requirement. The invention effectively ensures the quality of the asphalt mixture while saving resources and financial resources, has important popularization significance for realizing the aim of 'double carbon', is worthy of further exploration in future research and practice, and realizes the aim of 100 percent replacement of natural aggregates.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the following detailed description of the preferred embodiments is provided in conjunction with the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below, and it is apparent that, the drawings in the following description are some embodiments of the invention, and it is obvious to those skilled in the art that other drawings can be obtained from the drawings without inventive effort.
FIG. 1 shows the results of stability and flow value tests of asphalt mixtures according to different embodiments of example 1;
FIG. 2 shows the results of the stability and flow value tests of asphalt mixtures according to different embodiments of example 2;
FIG. 3 shows the results of stability and flow value tests on asphalt mixtures according to different design schemes in example 3;
FIG. 4 shows the results of the stability and flow test of the asphalt mixture according to different embodiments of example 4;
FIG. 5 shows the results of the stability and flow value tests of the asphalt mixtures according to different embodiments of example 5.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an artificial aggregate based on lithium slag, which comprises the lithium slag, an alkali activator and a cementing material, wherein the weight ratio of the lithium slag to the cementing material is (1.5-3.0): 1, the volume of the alkali activator and the total weight ratio of the lithium slag and the cementing material are (0.28-0.32) ml:1g; the alkali activator comprises-OH and-SiO 3 Wherein the content of-OH in the alkali activator is 2.0mol/L to 3.2mol/L, -SiO 3 The content of (b) is 3.6mol/L to 4.7mol/L.
The invention utilizes hydration among lithium slag, cementing material and alkali activator to strengthen the performance of artificial aggregate, and the basic principle is as follows:
AI 2 O 3 +3H 2 O+2OH-→2[AI(OH) 4 ] -
SiO 2 +H 2 O+OH - →[Si(OH) 3 ] -
SiO 2 +2OH-→[SiO 2 (OH) 2 ] -
preferably, the lithium slag is at least one of lepidolite lithium slag and spodumene lithium slag.
In this embodiment, the lepidolite lithium slag used in the test is from Jiang Li, yichun, jiangxi province, and the raw lepidolite ore is mainly from lepidolite ore and lepidolite ore in Yichun, wherein the lepidolite mainly comprises quartz, albite and muscovite, and the lepidolite is a secondary mineral of granite. The lepidolite lithium slag in a dry state is offwhite powder with strong water absorption capacity and apparent density of 2.317g/cm 3 ～2.600g/cm 3 。
In this embodiment, the spodumene slag used in the test was from the Jiangxi Fengjian Li industry, new Rich city, jiangxi province, and the raw lithium ore was from the Grignard spodumene deposit in southwestern of Yeer hillock, western Australia, and associated spodumene with aplite, pegsite and quartz vein. The spodumene lithium slag in a dry state is light yellow porous powder, has strong water absorption capacity and apparent density of 3.226g/cm 3 ～3.237g/cm 3 。
Preferably, the alkali activator is a mixed solution of sodium hydroxide solution and/or potassium hydroxide solution and sodium silicate solution. Specifically, mixing a sodium hydroxide solution and a sodium silicate solution to obtain an alkali activator, or mixing a potassium hydroxide solution and a sodium silicate solution to obtain an alkali activator, or mixing a sodium hydroxide solution, a potassium hydroxide solution and a sodium silicate solution to obtain an alkali activator, stirring the mixture for not less than 5min, and standing the mixture for 24h after the stirring is completed. In the present embodiment, the content of-OH in the sodium hydroxide or sodium hydroxide solution is 9 to 11mol/L, and the content of-SiO in the sodium silicate solution is 3 The content of (b) is 5mol/L to 6mol/L.
Preferably, the cementitious material is at least one of kaolin, cement, blast furnace slag, bentonite and diatomaceous earth. Kaolin, cement, blast furnace slag, bentonite and diatomite all belong to materials with hydration activity or potential pozzolanic activity, and are beneficial to improving the compressive strength of the artificial aggregate, and the strength of the artificial aggregate can be improved by adding a cementing material.
In this embodiment, kaolin used in the test was derived from the Zhuo Chuang chemical industry of Zheng City, henan province, and was a white powder in a dry state. The particle sizes of D10, D50 and D90 of the kaolin were 0.95 μm, 2.88 μm and 13.18 μm, respectively. The kaolin comprises the following chemical components: siO 2 2 And Al 2 O 3 The ratio of the components is 50.69% and 46.04%, respectively.
In the present embodiment, the cement used in the test was PO52.5 cement from Yang Chun cement, ltd, which is a grayish blue powder in a dry state. The D10, D50 and D90 particle sizes of the cements were 2.19 μm, 15.14 μm and 52.48 μm, respectively. The cement comprises the following chemical components: caO, siO 2 And Al 2 O 3 The ratios are 55.28%, 21.24% and 7.69%, respectively.
In this embodiment, the blast furnace slag used in the test was from the autonomous region of Uygur autonomous region of Xinjiang and was in the form of yellowish-earthy crushed stone particles in a dry state. The D10, D50 and D90 particle sizes of the blast furnace slag were 5.75 μm, 30.20 μm and 89.60 μm, respectively. The blast furnace slag mainly comprises the following chemical components: caO, siO 2 And Al 2 O 3 The ratio of the components is 34.28%, 29.97% and 34.28% respectively.
In the present embodiment, the bentonite used in the test was calcium bentonite, and it was a beige powder in a dry state. The particle sizes of D10, D50 and D90 of the bentonite were 8.71 μm, 52.48 μm and 181.97 μm, respectively. The bentonite comprises the following main chemical components: caO, siO 2 And Fe 2 O 3 The percentages are 57.92%, 19.07% and 8.39%, respectively.
In the present embodiment, the diatomaceous earth used in the test was derived from jiekang diatomaceous earth available from zheng city, southern hui province, and was a white powder in a dry state. The particle sizes of the diatomaceous earth, D10, D50 and D90, were 5.75 μm, 19.55 μm and 39.81 μm, respectively. The chemical composition of the diatomite is SiO 2 、Na 2 O and Al 2 O 3 The ratio of the components is 90.05 percent respectively,2.95% and 2.81%.
Example 1
An artificial aggregate based on lithium slag is prepared by the following steps:
step 1: and (3) taking 600.0g of lepidolite lithium slag and 400.0g of cement material, drying for 12h in a drying oven at 105 ℃, and then putting the dried lepidolite lithium slag and the cement material into a stirrer to be stirred for 1min to achieve uniform mixing, thereby obtaining a powder system.
Step 2: and pouring the uniformly stirred powder system into a disc granulator, opening a switch of the disc granulator, and spraying the prepared alkali activator for granulation to obtain a particle system. The alkali activator adopts sodium hydroxide solution with-OH of 10.0mol/L and-SiO 3 5.5mol/L of Na 2 SiO 3 Mixing the solution with 80.0ml of sodium hydroxide solution 2 SiO 3 The solution was 240.0ml. the-OH content in the prepared alkali activator is 2.5mol/L and-SiO 3 It was 4.1mol/L. The alkali activator adopts a spray type spraying mode, the spraying amount is 320.0ml, the granulation time is 20min, the included angle between a disc of a disc granulator and a normal line is 50 degrees, and the rotating speed of the disc granulator is 55r/min.
And step 3: and after granulation, taking out the particle system for maintenance at the temperature of 20 ℃, the relative humidity of 80 percent and the maintenance time of 28 days, thereby forming the artificial aggregate.
The compressive strength test of the artificial aggregate based on the lithium slag prepared in the embodiment can reach 16.18MPa after 28 d.
An asphalt mixture comprises natural mineral powder, natural aggregate, asphalt and the artificial aggregate based on lithium slag prepared in the embodiment. The I-D type SBS modified asphalt is selected as asphalt mixture cementing material, the natural mineral powder is limestone mineral powder, and the natural aggregate is limestone aggregate. The artificial aggregate and the natural aggregate prepared in the example were respectively sieved to obtain classified granules with the particle diameters of 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm and 16 mm. And replacing the artificial aggregate with the particles with the particle sizes with the natural aggregate with the corresponding particle sizes according to the designed mass ratio.
According to the design proportion of each material and the dosage of different materials, an AC-13 type asphalt mixture with different artificial aggregate addition amounts is respectively designed, and the use proportion and dosage results of different materials are shown in a table 1.
TABLE 1 design proportions of different material dosages
According to different design proportions, asphalt mixture test pieces with different design schemes are respectively prepared, and the method comprises the following steps: various materials are uniformly stirred at the temperature of 155 +/-5 ℃, and a test piece is formed under the pressure of 20Mpa, wherein the geometric dimension of the test piece is as follows: cylindrical test pieces 63.5mm high and 101.6mm in diameter. The stability and flow index of the test piece under different schemes are tested, and the result is shown in figure 1. As can be seen from FIG. 1, the test results of the stability and fluidity of the asphalt mixture according to different design schemes meet the requirements of JTG F40-2004 technical Specification for construction of asphalt pavements for roads, which indicates that the artificial aggregate based on lithium slag prepared in this example can be used for designing and applying the asphalt mixture.
Example 2
The method comprises the following steps: and (3) taking 750.0g of lepidolite lithium slag and 250.0g of kaolin material, drying for 18h in a drying oven at the temperature of 115 ℃, and then putting the dried lepidolite lithium slag and the diatomite material into a stirrer to be stirred for 1min to achieve uniform mixing, thereby obtaining a powder system.
Step two: and pouring the uniformly stirred powder system into a disc granulator, opening a switch of the disc granulator, and simultaneously spraying the prepared alkali activator for granulation to obtain a granule system. The alkali activator adopts sodium hydroxide solution with-OH of 7.0mol/L and-SiO 3 Na of 6.58mol/L 2 SiO 3 Mixing the solution with 80.0ml of sodium hydroxide solution 2 SiO 3 The solution was 200.0ml. The content of-OH in the prepared alkali excitant is 2.0mol/L and-SiO 3 It was 4.7mol/L. The alkali activator adopts spray type spray mode, the spray amount is 280.0ml, the granulation time is 15min, the included angle between the disc of the disc granulator and the normal line is 45 degrees, and the rotating speed of the disc granulator is 60 degreesr/min。
Step three: and after granulation, taking out the particle system for maintenance at the temperature of 25 ℃, at the relative humidity of 85 percent for 28 days, thereby forming the artificial aggregate.
The compressive strength test of the artificial aggregate based on the lithium slag prepared in the embodiment shows that the compressive strength of the artificial aggregate based on the lithium slag in 28 days can reach 14.3MPa.
An asphalt mixture comprises natural mineral powder, natural aggregate, asphalt and the artificial aggregate based on lithium slag prepared in the embodiment. The I-D type SBS modified asphalt is selected as asphalt mixture cementing material, the natural mineral powder is limestone mineral powder, and the natural aggregate is limestone aggregate. The artificial aggregate and the natural aggregate prepared in the example were respectively sieved to obtain classified granules with the particle diameters of 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm and 16 mm. And replacing the artificial aggregate with the particles with the particle sizes with the natural aggregate with the corresponding particle sizes according to the designed mass ratio.
According to the design proportion of each material and the dosage of different materials, an AC-13 type asphalt mixture with different artificial aggregate addition amounts is respectively designed, and the results of the use proportion and dosage of different materials are shown in table 1 in example 1.
According to different design proportions, asphalt mixture test pieces with different design schemes are respectively prepared, and the method comprises the following steps: various materials are uniformly stirred at the temperature of 155 +/-5 ℃, and a test piece is formed under the pressure of 20Mpa, wherein the geometric dimension of the test piece is as follows: cylindrical test pieces 63.5mm in height and 101.6mm in diameter. The stability and flow index of the test piece under different schemes are tested, and the result is shown in fig. 2. As can be seen from FIG. 2, the stability and fluidity test results of the asphalt mixture with different design schemes meet the requirements of JTG F40-2004 technical Specification for construction of asphalt road pavement on roads, which indicates that the artificial aggregate based on lithium slag prepared in the embodiment can be used for the design and application of the asphalt mixture.
Example 3
The method comprises the following steps: taking 700.0g of spodumene lithium slag and 300.0g of blast furnace slag material, drying in an oven at 110 ℃ for 24h, and then putting the dried spodumene lithium slag and kaolin material into a stirrer to stir for 1min so as to obtain a powder system after uniform mixing.
Step two: and pouring the uniformly stirred powder system into a disc granulator, opening a switch of the disc granulator, and simultaneously spraying the prepared alkali activator for granulation to obtain a granule system. The alkali activator adopts sodium hydroxide solution with-OH of 8.0mol/L and-SiO 3 Na of 6.72mol/L 2 SiO 3 Mixing the solution with 96.0ml of sodium hydroxide solution 2 SiO 3 The solution was 224.0ml. the-OH content in the prepared alkali activator is 2.4mol/L and-SO 3 It was 4.7mol/L. The alkali activator adopts a spray type spraying mode, the spraying amount is 320.0ml, the granulation time is 18min, the included angle between a disc of the disc granulator and a normal line is 35 degrees, and the rotating speed of the disc granulator is 50r/min.
Step three: and taking out the particle system after granulation is finished, and maintaining the particle system at the temperature of 30 ℃, the relative humidity of 80 percent and the maintenance time of 14 days to form the artificial aggregate.
The artificial aggregate based on the lithium slag prepared in the embodiment is subjected to a compressive strength test, and the compressive strength of 14d can reach 14.3MPa.
An asphalt mixture comprises natural mineral powder, natural aggregate, asphalt and the artificial aggregate based on lithium slag prepared in the embodiment. The I-D type SBS modified asphalt is selected as asphalt mixture cementing material, the natural mineral powder is limestone mineral powder, and the natural aggregate is limestone aggregate. The artificial aggregate and the natural aggregate prepared in the example were respectively sieved to obtain classified granules with particle diameters of 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm and 16 mm. And replacing the artificial aggregate with the particles with the particle sizes with the natural aggregate with the corresponding particle sizes according to the designed mass ratio.
According to the design proportion of each material and the dosage of different materials, an AC-13 type asphalt mixture with different artificial aggregate addition amounts is respectively designed, and the results of the use proportion and dosage of different materials are shown in table 1 in example 1.
According to different design proportions, asphalt mixture test pieces with different design schemes are respectively prepared, and the method comprises the following steps: various materials are uniformly stirred at the temperature of 155 +/-5 ℃, and a test piece is formed under the pressure of 20Mpa, wherein the geometric dimension of the test piece is as follows: cylindrical test pieces 63.5mm in height and 101.6mm in diameter. The stability and flow index of the test piece under different schemes were tested, and the results are shown in fig. 3. As can be seen from FIG. 3, the test results of the stability and fluidity of the asphalt mixture according to different design schemes meet the requirements of JTG F40-2004 technical Specification for construction of asphalt pavements for roads, which indicates that the artificial aggregate based on lithium slag prepared in this example can be used for designing and applying the asphalt mixture.
Example 4
The method comprises the following steps: and (3) taking 642.9g of spodumene lithium slag and 357.1g of bentonite material, drying the spodumene lithium slag and the bentonite material in an oven at the temperature of 100 ℃ for 12 hours, and then putting the dried spodumene lithium slag and the blast furnace slag material into a stirrer to stir for 1min to achieve uniform mixing, thereby obtaining a powder system.
Step two: and pouring the uniformly stirred powder system into a disc granulator, opening a switch of the disc granulator, and spraying the prepared alkali activator for granulation to obtain a particle system. The alkali activator adopts sodium hydroxide solution with-OH of 10.0mol/L and-SiO 3 5.29mol/L of Na 2 SiO 3 Mixing the solution with 96.0ml of sodium hydroxide solution and Na 2 SiO 3 The solution was 204.0ml. The content of-OH in the prepared alkali activator is 3.2mol/L and-SO 3 Is 3.6mol/L. The alkali activator adopts a spray type spraying mode, the spraying amount is 300.0ml, the granulation time is 20min, the included angle between the disc of the disc granulator and the normal line is 50 degrees, and the rotating speed of the disc granulator is 40r/min.
Step three: and after granulation, taking out the particle system for maintenance at the temperature of 20 ℃, at the relative humidity of 90% for 20 days, thereby forming the artificial aggregate.
The compressive strength of the artificial aggregate based on the lithium slag prepared in the embodiment can reach 12.45MPa after 20d of compressive strength test.
An asphalt mixture comprises natural mineral powder, natural aggregate, asphalt and the artificial aggregate based on lithium slag prepared in the embodiment. The I-D type SBS modified asphalt is selected as asphalt mixture cementing material, the natural mineral powder is limestone mineral powder, and the natural aggregate is limestone aggregate. The artificial aggregate and the natural aggregate prepared in the example were respectively sieved to obtain classified granules with the particle diameters of 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm and 16 mm. And replacing the artificial aggregate with the particles with the particle sizes with the natural aggregate with the corresponding particle sizes according to the designed mass ratio.
According to the design proportion of each material and the dosage of different materials, an AC-13 type asphalt mixture with different artificial aggregate addition amounts is respectively designed, and the results of the use proportion and dosage of different materials are shown in table 1 in example 1.
According to different design proportions, asphalt mixture test pieces with different design schemes are respectively prepared, and the method comprises the following steps: various materials are uniformly stirred at the temperature of 155 +/-5 ℃, and a test piece is formed under the pressure of 20Mpa, wherein the geometric dimension of the test piece is as follows: cylindrical test pieces 63.5mm in height and 101.6mm in diameter. The stability and flow index of the test piece under different schemes were tested, and the results are shown in fig. 4. As can be seen from FIG. 4, the stability and fluidity test results of the asphalt mixture with different design schemes meet the requirements of JTG F40-2004 technical Specification for construction of asphalt pavement for roads, which indicates that the artificial aggregate based on lithium slag prepared in this example can be used for the design and application of asphalt mixture.
Example 5
The method comprises the following steps: taking 300.0g of spodumene lithium slag, 350.0g of lepidolite lithium slag and 300.0g of diatomite material, drying in an oven at 105 ℃ for 24 hours, and then putting the dried spodumene lithium slag, the lepidolite lithium slag and the bentonite material into a stirrer to stir for 1min to achieve uniform mixing, thereby obtaining a powder system.
Step two: and pouring the uniformly stirred powder system into a disc granulator, opening a switch of the disc granulator, and simultaneously spraying the prepared alkali activator for granulation to obtain a granule system. The alkali activator adopts sodium hydroxide solution with-OH of 10.0mol/L and-SiO 3 Na of 6.91mol/L 2 SiO 3 Mixing the solution with 94.1ml of sodium hydroxide solution 2 SiO 3 The solution was 199.9ml. The content of-OH in the prepared alkali activator is 3.2mol/L and-SO 3 It was 4.7mol/L. AlkaliThe exciting agent adopts a spray type spraying mode, the spraying amount is 294.0ml, the granulation time is 15min, the included angle between a disc of the disc granulator and a normal line is 35 degrees, and the rotating speed of the disc granulator is 60r/min.
Step three: and after granulation, taking out the particle system for curing at the temperature of 30 ℃, at the relative humidity of 90 percent for 14 days, thereby forming the artificial aggregate.
The compressive strength test of the artificial aggregate based on the lithium slag prepared in the embodiment shows that the compressive strength of 14d can reach 13.92MPa.
An asphalt mixture comprises natural mineral powder, natural aggregate, asphalt and the artificial aggregate based on lithium slag prepared in the embodiment. The I-D type SBS modified asphalt is selected as asphalt mixture cementing material, the natural mineral powder is limestone mineral powder, and the natural aggregate is limestone aggregate. The artificial aggregate and the natural aggregate prepared in the example were respectively sieved to obtain classified granules with the particle diameters of 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm and 16 mm. And replacing the artificial aggregate with the particles with the particle sizes with the natural aggregate with the corresponding particle sizes according to the designed mass ratio.
According to the design proportion of each material and the dosage of different materials, an AC-13 type asphalt mixture with different artificial aggregate addition amounts is respectively designed, and the results of the use proportion and dosage of different materials are shown in table 1 in example 1.
According to different design proportions, asphalt mixture test pieces with different design schemes are respectively prepared, and the method comprises the following steps: various materials are uniformly stirred at the temperature of 155 +/-5 ℃, and a test piece is formed under the pressure of 20Mpa, wherein the geometric dimension of the test piece is as follows: cylindrical test pieces 63.5mm in height and 101.6mm in diameter. The stability and flow index of the test piece under different schemes were tested, and the results are shown in fig. 5. As can be seen from FIG. 5, the test results of the stability and fluidity of the asphalt mixture according to different design schemes satisfy the requirements of JTG F40-2004 technical Specification for construction of asphalt pavements for roads, which indicates that the artificial aggregate based on lithium slag prepared in this example can be used for designing and applying the asphalt mixture.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The artificial aggregate based on the lithium slag is characterized by comprising the lithium slag, an alkali activator and a cementing material, wherein the weight ratio of the lithium slag to the cementing material is (1.5-3.0): 1, the volume of the alkali activator and the total weight ratio of the lithium slag and the cementing material are (0.28-0.32) ml:1g of a compound; the alkali activator comprises-OH and-SiO 3 Wherein the content of-OH is 2.0 mol/L-3.2 mol/L, and the-SiO 3 The content of (b) is 3.6mol/L to 4.7mol/L.
2. The artificial aggregate based on lithia slag according to claim 1, wherein the lithia slag is at least one of lepidolite lithia slag and spodumene lithia slag.
3. The artificial aggregate based on lithium slag according to claim 1, wherein the alkali activator is a mixed solution of sodium hydroxide solution and/or potassium hydroxide solution and sodium silicate solution.
4. The artificial aggregate based on lithium slag according to claim 1, wherein the gelling material is at least one of kaolin, cement, blast furnace slag, bentonite and diatomite.
5. The method for preparing artificial aggregate based on lithium slag according to any one of claims 1 to 4, comprising:
uniformly mixing the dried lithium slag with the cementing material to obtain a powder system;
putting the powder system into granulation equipment, starting the granulation equipment, and spraying the alkali activator to the powder system for granulation to obtain a particle system;
and curing the particle system under set conditions to obtain the artificial aggregate.
6. The method for preparing the artificial aggregate based on the lithium slag as claimed in claim 5, wherein the granulating device is a disc granulator; when the alkali activator is sprayed to the powder system, the included angle between the disc of the disc granulator and the normal is 35-50 degrees, and the rotating speed of the disc granulator is 40-60 r/min.
7. The method for preparing artificial aggregate based on lithium slag according to claim 5, wherein the alkali-activating agent is sprayed to the powder system by a spray-type spraying method.
8. The method for preparing the artificial aggregate based on the lithium slag according to claim 5, wherein the granulation time is 15-20 min.
9. The method for preparing artificial aggregate based on lithium slag according to claim 5, wherein curing the particle system under the set conditions specifically comprises:
the curing temperature is 20-30 ℃, the relative humidity is 80-90%, and the curing time is 14-28 days.
10. An asphalt mixture, which comprises the artificial aggregate, the natural mineral powder, the natural aggregate and the asphalt of any one of claims 1 to 4, wherein the weight of the artificial aggregate accounts for 40 to 90 percent of the weight of the asphalt mixture, the weight of the natural mineral powder accounts for 3 to 8 percent of the weight of the asphalt mixture, the weight of the natural aggregate accounts for 0 to 50 percent of the weight of the asphalt mixture, and the weight of the asphalt accounts for 4 to 6 percent of the weight of the asphalt mixture.
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| CN116813292A (en) * | 2023-06-12 | 2023-09-29 | 江西省交通科学研究院有限公司 | Lithium slag cement stabilized macadam base material and preparation method thereof |
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| JP2007112657A (en) * | 2005-10-19 | 2007-05-10 | Sanyo Special Steel Co Ltd | Method of improving wear resistance of aggregate comprising steel making slag by granulation |
| CN114538813A (en) * | 2020-11-24 | 2022-05-27 | 香港理工大学深圳研究院 | Geopolymer artificial aggregate based on disc granulator and preparation method thereof |
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| JP2007112657A (en) * | 2005-10-19 | 2007-05-10 | Sanyo Special Steel Co Ltd | Method of improving wear resistance of aggregate comprising steel making slag by granulation |
| CN114538813A (en) * | 2020-11-24 | 2022-05-27 | 香港理工大学深圳研究院 | Geopolymer artificial aggregate based on disc granulator and preparation method thereof |
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| CN116813292A (en) * | 2023-06-12 | 2023-09-29 | 江西省交通科学研究院有限公司 | Lithium slag cement stabilized macadam base material and preparation method thereof |
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