CN-122010469-A - Soft soil curing agent based on industrial waste residues and preparation method and application thereof

Abstract

The invention discloses a soft soil curing agent based on industrial waste residues, a preparation method and application thereof, belonging to the technical field of soft soil curing agents, wherein waste residues generated by lithium batteries are subjected to material selection, water washing desalination and low-temperature roasting to obtain pretreated lithium battery residues, cobalt, nickel and manganese oxides contained in the pretreated lithium battery residues are synergistic with the lithium residues and cement clinker to rapidly generate gelled products such as hydrated calcium silicate, ettringite and the like, the early strength of the curing agent is improved, the 7d compressive strength is more than or equal to 3.5MPa, the rapid reinforcing requirement of a soft soil foundation is met, aluminate components in the red mud can optimize the microstructure of the cured body, the compressibility is reduced, carbide slag provides an alkaline environment, the dissolution of active components of all raw materials is promoted, the compatibility of the curing agent and soft soil is enhanced, the adaptability of the curing agent is strong, and powder or slurry products can be prepared by adjusting the water-material ratio.

Inventors

• LIN HAIMING
• BIAN ZIJUN
• ZHANG FAJIE
• WU GUOXUN
• LIN GUANGYUAN
• CHEN ZHONGYONG
• LUO GUAN
• You Lianhuan
• WANG LIPENG
• LU CHENGZHENG
• JIN LIPENG
• CHEN XING
• BAO QIANG
• LI LETIAN
• ZHENG YUN
• WANG FENG
• Zeng Chuidong
• LI ANG
• ZHANG YONGLIANG
• WANG RUNSHENG
• JIAO ZIGUO

Assignees

• 华能罗源发电有限责任公司
• 苏州西热节能环保技术有限公司
• 西安热工研究院有限公司

Dates

Publication Date

20260512

Application Date

20260122

Claims (10)

1. 1. The preparation method of the soft soil curing agent based on the industrial waste residues is characterized by comprising the following steps: The method comprises the steps of selecting materials, washing and desalting waste residues generated by a lithium battery, roasting at a low temperature to obtain pretreated lithium battery residues, mixing 35% -45% of pretreated lithium battery residues with 15% -25% of lithium residues, 20% -30% of cement clinker, 5% -10% of red mud and 5% -10% of carbide slag by mass percent to obtain mixed materials, ball-milling the mixed materials to a specific surface area of 400-500m 2 /kg to obtain a soft soil curing agent based on industrial waste residues; The initial setting time of the soft soil curing agent based on the industrial waste residues is more than or equal to 45min, the final setting time is less than or equal to 10h and 7d the compressive strength is more than or equal to 3.5MPa.
2. 2. The method for preparing the industrial residue-based soft soil curing agent according to claim 1, wherein the material selection conditions comprise screening residues generated in the lithium battery production and disassembly process, and removing metal scraps, plastic impurities and blocky particles with the particle size of more than 5mm from the residues; The conditions of water washing and desalting comprise that the lithium battery slag after material selection is soaked in deionized water, the liquid-solid ratio is 3:1-5:1, the soaking temperature is 25-35 ℃, the stirring speed is 100-150r/min, the soaking time is 2-4h, and water is changed for 2-3 times; The low-temperature roasting condition comprises roasting the lithium battery slag after water washing and desalting at 300-400 ℃ for 1-2h, and naturally cooling to room temperature.
3. 3. The method for preparing the industrial residue-based soft soil curing agent according to claim 1, wherein the lithium residue is a byproduct of lithium extraction from lithium ores, and the water content is less than or equal to 5%; the cement clinker is P.O42.5 grade cement clinker, and the content of free calcium oxide is less than or equal to 1.5 percent; The red mud is Bayer process red mud in aluminum industry, and is dried to constant weight at 105 ℃; The carbide slag is a byproduct of acetylene production, and the content of calcium hydroxide is more than or equal to 85%.
4. 4. The preparation method of the industrial waste residue-based soft soil curing agent according to claim 1, wherein the particle size of lithium slag is 1-3mm, the particle size of cement clinker is 1-3mm, the particle size of red mud is 1-3mm, and the particle size of carbide slag is 1-3mm.
5. 5. The method for preparing an industrial residue-based soft soil curing agent according to claim 1, wherein the mixing speed is 200-300r/min, and the mixing time is 15-20min.
6. 6. The method for preparing the industrial waste residue-based soft soil curing agent according to claim 1, wherein the ball milling medium is alumina balls, the ball-material ratio is 8:1-10:1, and the milling time is 2-3h.
7. 7. The method for preparing the industrial residue-based soft soil curing agent according to claim 1, wherein the temperature of a grinding cavity of the ball mill is less than or equal to 60 ℃.
8. 8. The method for preparing the industrial residue-based soft soil curing agent according to claim 1, wherein deionized water is added in the ball milling process, the water-material ratio is 0.4:1-0.5:1, and the slurry-shaped industrial residue-based soft soil curing agent is obtained after uniform stirring.
9. 9. An industrial waste residue-based soft soil curing agent, characterized in that the industrial waste residue-based soft soil curing agent is prepared by the preparation method of any one of claims 1-8.
10. 10. The use of the industrial residue-based soft soil hardener prepared by the method for preparing industrial residue-based soft soil hardener of any one of claims 1 to 8 in highway subgrade, foundation pit backfill, dyke seepage prevention, road base and parking lot foundation.

Description

Soft soil curing agent based on industrial waste residues and preparation method and application thereof Technical Field The invention belongs to the technical field of soft soil curing agents, and particularly relates to an industrial waste residue-based soft soil curing agent, a preparation method and application thereof. Background The soft soil curing agent is a functional material capable of improving the physical and mechanical properties of soft soil, and mainly reduces the moisture content of the soft soil and enhances the bonding force among particles through physical adsorption, chemical reaction (such as ion exchange and gelation reaction) or physical and chemical action, so that the strength, stability and impermeability of soft soil are improved, the compressibility and settlement are reduced, the soft soil curing agent is various in types, is widely applied to projects such as highway, railway, harbor and building foundation treatment, and can be used for selecting the type and the doping amount of the adaptive curing agent according to the causes, components (such as organic matter content and sticky particle proportion) of the soft soil and the engineering requirements, thereby realizing the rapid improvement and stability of the soft soil foundation and meeting the requirements of engineering construction on the bearing capacity and durability of the foundation. Industrial waste residues are used as byproducts of industrial production, such as fly ash, slag, steel slag and the like, have huge stock, and if the industrial waste residues are piled up for a long time, not only occupy land resources, but also possibly cause environmental risks, in recent years, the utilization of the industrial waste residues as resources in the field of building materials becomes a research hot spot, and active ingredients such as silicon, aluminum, calcium and the like contained in the industrial waste residues can be subjected to physical-chemical reaction with moisture and clay minerals in soft soil under specific conditions, so that the industrial waste residues have the potential of being converted into functional curing materials. The Chinese patent application with publication number of CN105016661A provides a soft soil curing method based on industrial waste residues, which belongs to the field of civil engineering soft soil reinforcement treatment, and adopts fly ash or lime slag as a soft soil curing agent as a curing agent, and achieves the effect of soft soil curing through mixing and tamping with soft soil. Although the method can realize the 'waste treatment with waste' through industrial waste residues such as fly ash, lime slag and the like, the raw material cost of the curing agent is reduced, the process operation (mixing and tamping) is simple, the method is suitable for the conventional soft soil reinforcement scene, but the method does not have special suitability for soft soil with high water content, the early strength of the cured soft soil is improved to a limited extent (generally 7d unconfined compressive strength is less than 0.8 MPa), the recycling of high-risk industrial waste residues such as lithium batteries is not involved, the problem of heavy metal and electrolyte pollution caused by the storage of the lithium battery waste residues cannot be solved, and meanwhile, the curing agent is single in form (only suitable for dry mixing), and the method is difficult to meet the diversified construction requirements such as wet spraying grouting and the like. Therefore, a novel environment-friendly industrial waste residue-based soft soil curing agent is needed, and the problems that the pollution of lithium battery industrial waste residues is difficult to treat, the suitability of the curing agent for high-water-content soft soil is poor, the early strength is insufficient, and the form is single and cannot be adapted to multiple construction processes are solved. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide the industrial waste residue-based soft soil curing agent and the preparation method and application thereof, so as to solve the technical problems that the conventional curing agent has high pollution risk of industrial waste residue of the lithium battery, has poor suitability for soft soil with high water content, has limited early strength improvement and single product form, and is difficult to meet the requirements of diversified construction processes. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: the invention discloses a preparation method of a soft soil curing agent based on industrial waste residues, which comprises the following steps: The method comprises the steps of selecting materials, washing and desalting waste residues generated by a lithium battery, roasting at a low temperature to obtain pretreated lithium battery residues, mixing 35% -