Cement stabilized macadam mixture based on large-dosage lithium slag and preparation method of cement stabilized macadam mixture

Abstract

The invention provides a cement stabilized macadam mixture based on large-dosage lithium slag and a preparation method of the cement stabilized macadam mixture, and relates to the technical field of preparation of cement stabilized macadam layers.The preparation method comprises the steps that aggregate, cement, fly ash, lithium slag powder and a second exciting agent are mixed and stirred to be uniform, and the cement stabilized macadam mixture is obtained; and uniformly stirring the cement stabilized macadam mixture and water, and carrying out compression molding to obtain the cement stabilized macadam mixture based on the high-doping-amount lithium slag. According to the application, the lithium slag is subjected to activation, curing granulation and other processes to replace a part of cementing materials and graded broken stones in a cement stabilized broken stone layer, so that recycling, large-scale energy utilization and high-performance utilization of the lithium slag are realized; the lithium slag, the lithium slag powder and the active and non-active tailing smelting slag are prepared into the autoclaved artificial aggregate, and the autoclaved artificial aggregate is prepared into the cement stabilized macadam mixture, so that large-scale utilization of the lithium slag is realized, and the cost is reduced; the industrial waste and the lepidolite lithium slag are utilized, so that the environmental pollution is reduced, and the resource utilization of the waste is realized.

Description

Technical Field

[0001] The invention relates to the technical field of cement-stabilized crushed stone layer preparation, and in particular to a cement-stabilized crushed stone mixture based on a large amount of lithium slag and a preparation method thereof. Background Art

[0002] With the rapid development of the lithium industry, a large amount of lithium slag is produced, and the stockpile volume is increasing year by year. If lithium slag is not used on a large scale, it will restrict the development of the lithium battery industry and affect the ecological environment.

[0003] Cement stabilized gravel is a typical semi-rigid material, which is widely used in road engineering in my country. It has the advantages of high strength, high rigidity, good water stability and good frost resistance, and is particularly suitable for the use of heavy-load and heavy-traffic roads. The cement stabilized gravel layer (abbreviated as: water-stabilized layer) is made of graded gravel as aggregate, a certain amount of cementitious materials and sufficient mortar volume are used to fill the gaps in the aggregate, and it is spread, compacted and cured according to the principle of interlocking and squeezing.

[0004] In the prior art, the water-stabilizing layer is generally prepared by recycled aggregate and reinforced fiber. Specifically, the recycled aggregate and the reinforced fiber are both of a core-shell structure with a soft shell and a hard core to improve the mechanical strength of the water-stabilizing layer material. At the same time, nano-silicon dioxide is used to fill the gaps in the recycled aggregate. The modified polyester side chain on the surface of the reinforced fiber contains a siloxane structure. During the raw material blending process, the siloxane will hydrolyze and then combine with the active hydroxyl groups on the surface of other raw materials, thereby increasing the coordination between the reinforced fiber and other raw materials. The modified polyester main chain contains an organic silicon segment that can weaken the water absorption effect of the water-stabilizing layer. The polyacrylate side chain cooperates with the polyester main chain to further improve the mechanical strength of the water-stabilizing layer. However, the water-stabilizing layer preparation method in the prior art is highly polluting, expensive, and has a complicated process. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a cement-stabilized gravel mixture based on a large amount of lithium slag and a preparation method thereof, which is used to solve the technical problems of the water-stabilizing layer preparation method in the prior art, which is highly polluting, expensive and has a complicated process.

[0006] The present invention provides a method for preparing a cement-stabilized crushed stone mixture based on a large amount of lithium slag, comprising:

[0007] The aggregate, cement, fly ash, lithium slag powder and the second activator are mixed and stirred evenly to obtain a cement-stabilized gravel mixture; the cement-stabilized gravel mixture is mixed evenly with water and pressed into a shape to obtain a cement-stabilized gravel mixture based on a large amount of lithium slag;

[0008] The mass proportions of the components are: 70-82 parts of aggregate, 3-5 parts of cement, 3-8 parts of fly ash, 2-5 parts of lithium slag powder, 2-3 parts of the second activator, and 8-12 parts of water;

[0009] Among them, the aggregate components are lithium slag, artificial aggregate and crushed stone; the second activator is one or more of gypsum and lime; among them, the particle size of 0-0.6mm is lithium slag (10-16%), the particle size of 0.6-4.75mm (26-30%), 4.75-9.5mm (18-27%), 9.5-16.0mm (17-20%) is artificial aggregate, and 16.0-26.5mm (20-26%) is crushed stone.

[0010] In addition, the cement-stabilized crushed stone mixture based on a large amount of lithium slag according to the present invention may also have the following additional technical features:

[0011] Furthermore, the preparation method of lithium slag powder is:

[0012] After drying the lithium slag, mix it with 8%-10% limestone and grind it evenly to a specific surface area of ​​480-550m 2 / kg;

[0013] The lithium slag powder is then obtained after calcining at 950°C-1100°C for 1h-2h.

[0014] Furthermore, the preparation method of the artificial aggregate is:

[0015] After lithium slag, lithium slag powder, tailings, smelting slag, the first activator and water are uniformly mixed, the mixture is passed through a double-roll extrusion granulator to hydrothermally synthesize artificial aggregate; the synthesized artificial aggregate is then crushed into different particle sizes by a crusher to obtain artificial aggregates of different particle sizes;

[0016] Among them: the proportion of lithium slag and lithium slag powder is ≥70%; the first activator is one or more of water glass and sodium sulfate; the crushing value of artificial aggregate is ≤35%.

[0017] Further, in the step of mixing and stirring the aggregate, cement, fly ash, lithium slag powder and the second activator to obtain a cement-stabilized gravel mixture:

[0018] The proportion of lithium slag in cement-stabilized gravel mixture is 65%-75%.

[0019] Another aspect of the present invention provides a cement-stabilized crushed stone mixture based on a large amount of lithium slag, which is prepared by the above-mentioned method for preparing a cement-stabilized crushed stone mixture based on a large amount of lithium slag.

[0020] The above-mentioned cement-stabilized gravel mixture based on a large amount of lithium slag and its preparation method are obtained by mixing aggregate, cement, fly ash, lithium slag powder and a second activator to obtain a cement-stabilized gravel mixture, wherein the second activator is one or more of gypsum and lime; then the cement-stabilized gravel mixture is evenly mixed with water and pressed to form a cement-stabilized gravel mixture based on a large amount of lithium slag. Firstly, by activating and solidifying the lithium slag to replace part of the cementitious materials and graded gravel in the cement-stabilized gravel layer, the resource utilization, large-scale energy utilization and high-performance utilization of lithium slag are realized; secondly, lithium slag, lithium slag powder, active and inactive tailings smelting slag are prepared into autoclaved artificial aggregate, which is prepared into a cement-stabilized gravel mixture, and the proportion of lithium slag in the mixture can reach 65-75%, realizing the large-scale utilization of lithium slag and reducing costs; furthermore, the use of industrial waste and lithium mica lithium slag also reduces environmental pollution and realizes the resource utilization of waste. The method solves the technical problems of the prior art method for preparing cement-stabilized crushed stone layer, which is highly polluting, expensive and has a complicated process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the process of the preparation method of the present invention;

[0022] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] The present application provides a cement-stabilized gravel mixture based on a large amount of lithium slag and a preparation method thereof. The cement-stabilized gravel mixture prepared by the preparation method can improve the utilization rate of lithium slag in engineering fields such as roads, while solving the problems of land occupation and environmental pollution caused by large-scale storage of lithium slag, thereby saving natural resources.

[0026] Specifically, the method for preparing a cement-stabilized gravel mixture based on a large amount of lithium slag provided in the present application comprises steps S101-S102:

[0027] S101, mixing aggregate, cement, fly ash, lithium slag powder and a second activator to obtain a cement-stabilized gravel mixture.

[0028] Among them, the proportion of lithium slag in the cement-stabilized crushed stone mixture is 65%-75%; the preparation method of lithium slag powder is: the lithium slag is dried and mixed with 8%-10% limestone and evenly ground to a specific surface area of ​​480-550m 2 / kg; and then calcined at 950℃-1100℃ for 1h-2h to obtain lithium slag powder.

[0029] On the one hand, by activating and solidifying lithium slag to replace part of the cementitious materials and graded crushed stone in the cement-stabilized crushed stone layer, the resource utilization, large-scale energy utilization and high-performance utilization of lithium slag are realized. Secondly, under high temperature and grinding conditions, the limestone and feldspar minerals in the lithium slag react with gypsum to form dicalcium silicate and tricalcium aluminate, both of which can participate in the hydration of cementitious materials in the later water-stabilized layer, thereby improving the activity of lithium slag.

[0030] S102, mixing the cement-stabilized crushed stone mixture with water evenly and pressing and molding to obtain a cement-stabilized crushed stone mixture based on a large amount of lithium slag.

[0031] Lithium slag, lithium slag powder, active and inactive tailings smelting slag are prepared into autoclaved artificial aggregate, which is then prepared into cement-stabilized crushed stone mixture. The proportion of lithium slag in the mixture can reach 65-75%, realizing the large-scale utilization of lithium slag. Secondly, the use of industrial waste and lithium mica lithium slag also reduces environmental pollution and realizes the resource utilization of waste.

[0032] The cement-stabilized gravel mixture based on a large amount of lithium slag provided by the present application comprises the following components in proportion by mass: 70-82 parts of aggregate, 3-5 parts of cement, 3-8 parts of fly ash, 2-5 parts of lithium slag powder, 2-3 parts of a second activator, and 8-12 parts of water; wherein the aggregate components are lithium slag, artificial aggregate, and gravel; the second activator is one or more of gypsum and lime; wherein the particle size of 0-0.6 mm is lithium slag (10-16%), the particle sizes of 0.6-4.75 mm (26-30%), 4.75-9.5 mm (18-27%), and 9.5-16.0 mm (17-20%) are artificial aggregate, and 16.0-26.5 mm (20-26%) are gravel.

[0033] Furthermore, the preparation method of artificial aggregate is: after lithium slag, lithium slag powder, tailings, smelting slag, a first activator and water are uniformly mixed, artificial aggregate is synthesized by hydrothermal method through a double-roll extrusion granulator; the synthesized artificial aggregate is crushed into different particle sizes by a crusher to obtain artificial aggregates of different particle sizes; wherein: the proportion of lithium slag and lithium slag powder is ≥70%; the first activator is one or more of water glass and sodium sulfate; the crushing value of artificial aggregate is ≤35%.

[0034] In order to facilitate understanding of the present invention, several embodiments of the present invention are provided below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0035] Embodiment 1:

[0036] The method for preparing a cement-stabilized gravel mixture based on a large amount of lithium slag provided in this embodiment is composed of the following raw materials in parts by mass: 75 parts of aggregate, 4 parts of cement, 5 parts of fly ash, 3 parts of lithium slag powder, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0037] Among them, among the aggregates, the particle size of 0-0.6 mm is lithium slag (10%), the particle sizes of 0.6-4.75 mm (28%), 4.75-9.5 mm (20%), and 9.5-16.0 mm (18%) are artificial aggregates, and 16.0-26.5 mm (24%) are crushed stone.

[0038] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0039] Embodiment 2:

[0040] The method for preparing a cement-stabilized gravel mixture based on a large amount of lithium slag provided in this embodiment is composed of the following raw materials in parts by mass: 75 parts of aggregate, 4 parts of cement, 5 parts of fly ash, 3 parts of lithium slag powder, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0041] Among them, among the aggregates, the particle size of 0-0.6 mm is lithium slag (15%), the particle sizes of 0.6-4.75 mm (26%), 4.75-9.5 mm (22%), and 9.5-16.0 mm (17%) are artificial aggregates, and 16.0-26.5 mm (20%) are crushed stone.

[0042] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0043] Embodiment 3:

[0044] The method for preparing a cement-stabilized gravel mixture based on a large amount of lithium slag provided in this embodiment is composed of the following raw materials in parts by mass: 75 parts of aggregate, 4 parts of cement, 5 parts of fly ash, 3 parts of lithium slag powder, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0045] Among them, among the aggregates, the particle size of 0-0.6 mm is lithium slag (10%), the particle sizes of 0.6-4.75 mm (26%), 4.75-9.5 mm (24%), and 9.5-16.0 mm (20%) are artificial aggregates, and 16.0-26.5 mm (20%) are crushed stone.

[0046] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0047] Embodiment 4:

[0048] The method for preparing a cement-stabilized gravel mixture based on a large amount of lithium slag provided in this embodiment is composed of the following raw materials in parts by mass: 80 parts of aggregate, 3 parts of cement, 3 parts of fly ash, 2 parts of lithium slag powder, 1 part of gypsum, 1 part of quicklime, and 10 parts of water.

[0049] Among them, among the aggregates, the particle size of 0-0.6 mm is lithium slag (10%), the particle sizes of 0.6-4.75 mm (28%), 4.75-9.5 mm (20%), and 9.5-16.0 mm (18%) are artificial aggregates, and 16.0-26.5 mm (24%) are crushed stone.

[0050] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0051] Embodiment 5:

[0052] The method for preparing a cement-stabilized gravel mixture based on a large amount of lithium slag provided in this embodiment is composed of the following raw materials in parts by mass: 80 parts of aggregate, 3 parts of cement, 3 parts of fly ash, 2 parts of lithium slag powder, 1 part of gypsum, 1 part of quicklime, and 10 parts of water.

[0053] Among them, among the aggregates, the particle size of 0-0.6 mm is lithium slag (15%), the particle sizes of 0.6-4.75 mm (26%), 4.75-9.5 mm (22%), and 9.5-16.0 mm (17%) are artificial aggregates, and 16.0-26.5 mm (20%) are crushed stone.

[0054] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0055] Embodiment 6:

[0056] The method for preparing a cement-stabilized gravel mixture based on a large amount of lithium slag provided in this embodiment is composed of the following raw materials in parts by mass: 80 parts of aggregate, 3 parts of cement, 3 parts of fly ash, 2 parts of lithium slag powder, 1 part of gypsum, 1 part of quicklime, and 10 parts of water.

[0057] Among them, among the aggregates, the particle size of 0-0.6 mm is lithium slag (10%), the particle sizes of 0.6-4.75 mm (26%), 4.75-9.5 mm (24%), and 9.5-16.0 mm (20%) are artificial aggregates, and 16.0-26.5 mm (20%) are crushed stone.

[0058] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0059] Embodiment 7:

[0060] The method for preparing a cement-stabilized gravel mixture based on a large amount of lithium slag provided in this embodiment is composed of the following raw materials in parts by mass: 70 parts of aggregate, 5 parts of cement, 8 parts of fly ash, 4 parts of lithium slag powder, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0061] Among them, among the aggregates, the particle size of 0-0.6m is lithium slag (10%), the particle sizes of 0.6-4.75mm (28%), 4.75-9.5mm (20%), and 9.5-16.0mm (18%) are artificial aggregates, and 16.0-26.5mm (24%) are crushed stone.

[0062] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0063] Embodiment 8:

[0064] The method for preparing a cement-stabilized gravel mixture based on a large amount of lithium slag provided in this embodiment is composed of the following raw materials in parts by mass: 70 parts of aggregate, 5 parts of cement, 8 parts of fly ash, 4 parts of lithium slag powder, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0065] Among them, among the aggregates, the particle size of 0-0.6 mm is lithium slag (15%), the particle sizes of 0.6-4.75 mm (26%), 4.75-9.5 mm (22%), and 9.5-16.0 mm (17%) are artificial aggregates, and 16.0-26.5 mm (20%) are crushed stone.

[0066] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0067] Embodiment 9:

[0068] The method for preparing a cement-stabilized gravel mixture based on a large amount of lithium slag provided in this embodiment is composed of the following raw materials in parts by mass: 70 parts of aggregate, 5 parts of cement, 8 parts of fly ash, 4 parts of lithium slag powder, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0069] Among them, among the aggregates, the particle size of 0-0.6 mm is lithium slag (10%), the particle sizes of 0.6-4.75 mm (26%), 4.75-9.5 mm (24%), and 9.5-16.0 mm (20%) are artificial aggregates, and 16.0-26.5 mm (20%) are crushed stone.

[0070] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0071] Comparative Example 1:

[0072] The method for preparing a cement-stabilized crushed stone mixture provided in this comparative example comprises the following raw materials in parts by weight: 75 parts of aggregate, 4 parts of cement, 8 parts of fly ash, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0073] Among them, the aggregates with particle sizes of 0-0.6mm (10%), 0.6-4.75mm (28%), 4.75-9.5mm (20%), 9.5-16.0mm (18%), and 16.0-26.5mm (24%) are all natural crushed stones.

[0074] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0075] Comparative Example 2:

[0076] The method for preparing a cement-stabilized crushed stone mixture provided in this comparative example comprises the following raw materials in parts by weight: 75 parts of aggregate, 4 parts of cement, 8 parts of fly ash, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0077] Among them, the aggregates with particle sizes of 0-0.6mm (15%), 0.6-4.75mm (26%), 4.75-9.5mm (22%), 9.5-16.0mm (17%), and 16.0-26.5mm (20%) are all natural crushed stones.

[0078] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0079] Comparative Example 3:

[0080] The method for preparing a cement-stabilized crushed stone mixture provided in this comparative example comprises the following raw materials in parts by weight: 75 parts of aggregate, 4 parts of cement, 8 parts of fly ash, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0081] Among them, the aggregates with particle sizes of 0-0.6mm (10%), 0.6-4.75mm (26%), 4.75-9.5mm (24%), 9.5-16.0mm (20%), and 16.0-26.5mm (20%) are all natural crushed stones.

[0082] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0083] Comparative Example 4:

[0084] The method for preparing a cement-stabilized crushed stone mixture provided in this comparative example comprises the following raw materials in parts by weight: 80 parts of aggregate, 3 parts of cement, 5 parts of fly ash, 1 part of gypsum, 1 part of quicklime, and 10 parts of water.

[0085] Among them, the aggregates with particle sizes of 0-0.6mm (10%), 0.6-4.75mm (28%), 4.75-9.5mm (20%), 9.5-16.0mm (18%), and 16.0-26.5mm (24%) are all natural crushed stones.

[0086] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0087] Comparative Example 5:

[0088] The method for preparing a cement-stabilized crushed stone mixture provided in this comparative example comprises the following raw materials in parts by weight: 80 parts of aggregate, 3 parts of cement, 5 parts of fly ash, 1 part of gypsum, 1 part of quicklime, and 10 parts of water.

[0089] Among the aggregates, particle sizes of 0-0.6mm (15%), 0.6-4.75mm (26%), 4.75-9.5mm (22%), 9.5-16.0mm (17%), and 16.0-26.5mm (20%) are all natural crushed stones.

[0090] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0091] Comparative Example 6:

[0092] The method for preparing a cement-stabilized crushed stone mixture provided in this comparative example comprises the following raw materials in parts by weight: 80 parts of aggregate, 3 parts of cement, 5 parts of fly ash, 1 part of gypsum, 1 part of quicklime, and 10 parts of water.

[0093] Among them, the aggregates with particle sizes of 0-0.6mm (10%), 0.6-4.75mm (26%), 4.75-9.5mm (24%), 9.5-16.0mm (20%), and 16.0-26.5mm (20%) are all natural crushed stones.

[0094] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0095] Comparative Example 7:

[0096] The method for preparing a cement-stabilized crushed stone mixture provided in this comparative example comprises the following raw materials in parts by weight: 70 parts of aggregate, 5 parts of cement, 12 parts of fly ash, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0097] Among them, the aggregates with particle sizes of 0-0.6mm (10%), 0.6-4.75mm (28%), 4.75-9.5mm (20%), 9.5-16.0mm (18%), and 16.0-26.5mm (24%) are all natural crushed stones.

[0098] Weigh the raw materials according to the above ratio, add them into the mixer and mix them evenly to finally obtain the cement-stabilized gravel mixture.

[0099] Comparative Example 8:

[0100] The method for preparing a cement-stabilized crushed stone mixture provided in this comparative example comprises the following raw materials in parts by weight: 70 parts of aggregate, 5 parts of cement, 12 parts of fly ash, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0101] Among them, the aggregates with particle sizes of 0-0.6 mm (15%), 0.6-4.75 mm (26%), 4.75-9.5 mm (22%), 9.5-16.0 mm (17%), and 16.0-26.5 mm (20%) are all natural crushed stones. Raw materials are weighed according to the above proportions, added into a mixer and stirred evenly, and finally a cement-stabilized crushed stone mixture is obtained.

[0102] Comparative Example 9:

[0103] The method for preparing a cement-stabilized crushed stone mixture provided in this comparative example comprises the following raw materials in parts by weight: 70 parts of aggregate, 5 parts of cement, 12 parts of fly ash, 1 part of gypsum, 2 parts of quicklime, and 10 parts of water.

[0104] Among them, the aggregates with particle sizes of 0-0.6 mm (10%), 0.6-4.75 mm (26%), 4.75-9.5 mm (24%), 9.5-16.0 mm (20%), and 16.0-26.5 mm (20%) are all natural crushed stones. Raw materials are weighed according to the above ratios, added into a mixer and stirred evenly, and finally a cement-stabilized crushed stone mixture is obtained. The raw material components of each embodiment and comparative example are shown in Table 1 and Table 2.

[0105] Table 1: Composition and content of each raw material %

[0106]

[0107]

[0108] Table 2: Aggregate composition and content

[0109]

[0110]

[0111]

[0112] The cement-stabilized crushed stone mixture obtained by using the raw material ratios of the above embodiment and the comparative example was tested, and the obtained 7d unconfined compressive strength is shown in Table 3 below:

[0113] Table 3:

[0114]

[0115]

[0116] It can be seen from Table 3 that the material strength of the cement-stabilized crushed stone mixture based on a large amount of lithium slag obtained in the present application is high, and its 7d unconfined compressive strength is above 4.5MPa, which can meet the needs of the pavement base and subbase of heavy traffic highways of level II and below (i.e., level III and level IV highways).

[0117] In summary, the cement-stabilized gravel mixture based on a large amount of lithium slag in the above-mentioned embodiment of the present invention is obtained by mixing aggregate, cement, fly ash, lithium slag powder and a second activator to obtain a cement-stabilized gravel mixture, wherein the second activator is one or more of gypsum and lime; then the cement-stabilized gravel mixture is evenly mixed with water and pressed to form a cement-stabilized gravel mixture based on a large amount of lithium slag. Firstly, by activating and solidifying the lithium slag to replace part of the cementitious materials and graded gravel in the cement-stabilized gravel layer, the resource utilization, large-scale energy utilization and high-performance utilization of lithium slag are realized; secondly, lithium slag, lithium slag powder, active and inactive tailings smelting slag are prepared into autoclaved artificial aggregate, which is prepared into a cement-stabilized gravel mixture, and the proportion of lithium slag in the mixture can reach 65-75%, realizing the large-scale utilization of lithium slag and reducing costs; furthermore, the use of industrial waste and lithium mica lithium slag also reduces environmental pollution and realizes the resource utilization of waste. The method solves the technical problems of the prior art method for preparing cement-stabilized crushed stone layer, which is highly polluting, expensive and has a complicated process.

[0118] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0119] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing a cement-stabilized crushed stone mixture based on a large amount of lithium slag, characterized in that: include: The aggregate, cement, fly ash, lithium slag powder and the second activator are mixed and stirred evenly to obtain a cement-stabilized gravel mixture; the cement-stabilized gravel mixture is mixed evenly with water and pressed into a shape to obtain a cement-stabilized gravel mixture based on a large amount of lithium slag; The mass proportions of the components are: 70-82 parts of aggregate, 3-5 parts of cement, 3-8 parts of fly ash, 2-5 parts of lithium slag powder, 2-3 parts of the second activator, and 8-12 parts of water; Among them, the aggregate components are lithium slag, artificial aggregate and crushed stone; the second activator is one or more of gypsum and lime; among them, the particle size of 0-0.6mm is lithium slag (10-16%), the particle size of 0.6-4.75mm (26-30%), 4.75-9.5mm (18-27%), 9.5-16.0mm (17-20%) is artificial aggregate, and 16.0-26.5mm (20-26%) is crushed stone.

2. The method for preparing cement-stabilized crushed stone mixture based on high-doped lithium slag according to claim 1, characterized in that: The preparation method of lithium slag powder is: After drying the lithium slag, mix it with 8%-10% limestone and grind it evenly to a specific surface area of ​​480-550m 2 / kg; The lithium slag powder is then obtained after calcining at 950°C-1100°C for 1h-2h.

3. The method for preparing cement-stabilized crushed stone mixture based on high-doped lithium slag according to claim 1, characterized in that: The preparation method of artificial aggregate is: After lithium slag, lithium slag powder, tailings, smelting slag, the first activator and water are uniformly mixed, the mixture is passed through a double-roll extrusion granulator to hydrothermally synthesize artificial aggregate; the synthesized artificial aggregate is then crushed into different particle sizes by a crusher to obtain artificial aggregates of different particle sizes; Among them: the proportion of lithium slag and lithium slag powder is ≥70%; the first activator is one or more of water glass and sodium sulfate; the crushing value of artificial aggregate is ≤35%.

4. The method for preparing cement-stabilized crushed stone mixture based on high-doped lithium slag according to claim 1, characterized in that: In the step of mixing and stirring aggregate, cement, fly ash, lithium slag powder and a second activator to obtain a cement-stabilized crushed stone mixture: The proportion of lithium slag in cement-stabilized gravel mixture is 65%-75%.

5. A cement-stabilized crushed stone mixture based on a large amount of lithium slag, characterized in that: The cement-stabilized crushed stone mixture is prepared by the method for preparing a cement-stabilized crushed stone mixture based on a large amount of lithium slag as described in any one of claims 1 to 4.

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