Large-scale storage method of high-purity nanometer powder based on stabilization treatment technology

Abstract

The application discloses a high-purity nanometer powder large-scale storage method based on a stabilization treatment technology, first, high-purity nanometer powder is selected, second, a nanometer powder growth module coupled with multiple physical fields is constructed, factors of negative pressure difference, cold trap temperature and steam flow rate are considered, the influence of different operation conditions on powder size, uniformity and sphericity is analyzed through monitoring a model, then, a Laval nozzle module based on negative pressure and cold trap tuning is established to improve airflow characteristics and particle formation and adjust relevant parameters to optimize powder characteristics, next, a surface micro passivation treatment of nanometer particles is carried out by combining a gas deposition method and a mechanical mixing method to reduce surface energy and inhibit agglomeration, finally, inert atmosphere assisted powder collection and liquid phase packaging technology are used for large-scale storage of superfine nanometer powder; through powder multi-stage sorting module treatment, the application realizes stabilization treatment and large-scale safe storage of high-purity nanometer powder.

Description

Technical Field

[0001] This invention belongs to the field of nanopowder production technology, and in particular relates to a method for large-scale storage of high-purity nanopowders based on stabilization treatment technology. Background Technology

[0002] With the rapid development of nanotechnology, nanopowders are being used more and more widely in the fields of electronics, medicine, and catalysts. High-purity nanopowders are receiving increasing attention due to their excellent performance and small size. However, there are many challenges in the production and storage of high-purity nanopowders, including particle agglomeration, size inhomogeneity, and stability issues during storage. Traditional powder processing and storage methods are difficult to effectively address these challenges.

[0003] First, the high specific surface area of ​​nanoparticles makes them prone to agglomeration during storage and processing, which not only affects the flowability of the powder but may also affect the performance of the final product. Second, in the production process of nanoparticles, the uniformity, sphericity, and size control of the powder are key technical challenges, and existing technologies often struggle to maintain the stability of these indicators in large-scale production.

[0004] To address these issues, researchers have proposed several new methods and technologies, but most still have room for improvement. In particular, ensuring the high purity, uniformity, and stability of nanoparticles during large-scale production and storage is a significant challenge in current technologies. Therefore, an innovative method for large-scale storage of high-purity nanoparticles is needed to improve production efficiency, ensure powder quality, and overcome the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to solve the problem of difficulty in ensuring the high purity, uniformity and stability of nanopowders during the large-scale production and storage of existing nanopowders, and to provide a method for large-scale storage of high-purity nanopowders based on stabilization treatment technology.

[0006] This invention achieves the above objective through the following technical solution: a method for large-scale storage of high-purity nanopowders based on stabilization treatment technology, comprising the following steps:

[0007] S01. High-purity nanopowder is used, wherein the particle size of the nanopowder is between 10 nm and 40 nm.

[0008] S02. Construction of a nanopowder growth module under multi-physics coupling: Construct a monitoring model that considers the effects of negative pressure difference, cold trap temperature, and steam flow rate on nanopowder growth, analyze the influence of different operating conditions on powder size, uniformity, and sphericity, and determine the optimal flow rate range to ensure the high quality of nanopowder.

[0009] S03. Construction of Laval Nozzle Module: Based on the data from the nanopowder growth module under multi-physics coupling, a Laval nozzle module based on negative pressure and cold trap tuning is constructed. This module includes inlet and outlet diameters, throat diameter, and expansion section length to improve airflow characteristics and nanoparticle formation. During the adjustment process, the negative pressure difference, cold trap temperature, and steam flow rate are adjusted to achieve the optimal effect of powder size, uniformity, and sphericity.

[0010] S04. Micro-passivation treatment of nanoparticle surface: The nanoparticle surface is micro-passivated using a combination of vapor deposition and mechanical mixing to reduce the surface energy of the powder, inhibit particle agglomeration, and optimize the passivation treatment conditions, including gas type, gas flow rate and temperature, to ensure that the nanoparticles are uniformly passivated in a fluidized state, forming a gas adsorption layer and reducing the van der Waals attraction thermal energy between particles.

[0011] S05. Inert large-scale storage of nanoparticles: The inert atmosphere-assisted powder collection and liquid phase encapsulation integrated technology is used for the large-scale storage, collection and encapsulation of ultrafine nanoparticles. The optimization of dispersant type, inert gas flow rate and liquid-gas ratio is used to improve the collection rate and encapsulation effect of ultrafine powders.

[0012] Furthermore, the nanopowder growth module under multi-physics coupling in step S02 includes a module for real-time adjustment of negative pressure difference, cold trap temperature and steam flow rate, so as to optimize the size uniformity and sphericity control of powder under different operating conditions.

[0013] Furthermore, the structural parameters of the Laval nozzle module in step S03 are optimized through CFD-DEM coupled simulation to achieve optimal flow field characteristics and uniform distribution of nanopowder.

[0014] Furthermore, the gas type for the nanoparticle surface micro-passivation treatment in step S04 includes, but is not limited to, nitrogen, argon, and helium, and the treatment temperature range is -50°C to 300°C.

[0015] Furthermore, the dispersant in the inert large-scale storage liquid-phase encapsulation of nanoparticles in step S05 includes, but is not limited to, surfactants and ion exchange resins. The optimization of its flow rate and liquid-to-gas ratio ensures that the ultrafine powder is uniformly dispersed during the encapsulation process, thereby ensuring its particle size uniformity and sphericity.

[0016] Beneficial effects: This invention has a reasonable design, simple and stable structure, strong practicality, and the following advantages:

[0017] 1. Improve the purity and uniformity of powders. This method ensures that the particle size of nanopowders is within the range of 10 nm to 40 nm by precisely controlling the growth process of nanopowders and combining a growth module under multi-physics field coupling. The size uniformity and sphericity of the nanopowders are optimized. This precise control not only improves the quality of nanopowders, but also provides a reliable guarantee for their use in high-tech applications.

[0018] 2. Optimize the formation and processing of nanopowders. By optimizing the design of the Laval nozzle module, adjusting the negative pressure difference, cold trap temperature and steam flow rate, the airflow characteristics can be improved, making the nanopowders more uniform during the formation process and reducing particle agglomeration. This optimized design makes the size and morphology of the nanopowders more stable, thereby improving the overall performance of the powder.

[0019] 3. Effectively reduce the surface energy and agglomeration of powders. In the surface micro-passivation treatment of nanoparticles, the combination of vapor deposition and mechanical mixing can effectively reduce the surface energy of powders and inhibit the agglomeration between particles. This treatment method reduces the van der Waals attraction between nanoparticles, thereby improving the flowability and storage stability of powders.

[0020] 4. Improve the efficiency of large-scale powder storage. With the application of inert atmosphere-assisted powder collection and liquid phase encapsulation integrated technology, by optimizing the type of dispersant, the flow rate of inert gas and the liquid-to-gas ratio, the collection rate and encapsulation effect of ultrafine powder can be effectively improved. This method ensures the stability of powder during storage and transportation, reduces loss and pollution, and extends the effective storage time of powder. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the process structure of the present invention. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Example 1:

[0024] Combination Figure 1 The method for large-scale storage of high-purity nanopowders based on stabilization technology, as shown, includes the following steps:

[0025] S01. High-purity nanopowders are used, with particle sizes ranging from 10 nm to 40 nm, to ensure excellent physical and chemical properties in applications and meet specific performance requirements.

[0026] S02. Construction of a Nanopowder Growth Module under Multiphysics Coupling: Construct a monitoring model considering the effects of negative pressure difference, cold trap temperature, and steam flow rate on nanopowder growth. This model should be able to capture the influence of these physical parameters on the nanopowder generation process in real time. Negative pressure difference affects the gas flow rate and the deposition behavior of nanopowder. Too low a negative pressure difference may lead to uneven deposition of particles in the airflow, while too high a negative pressure difference may increase the aggregation of powder. The model should be designed to adjust the negative pressure difference to achieve optimal particle distribution and particle size control. Cold trap temperature affects the condensation rate of the gas and the cohesion of nanoparticles. A lower cold trap temperature can make the gas condense rapidly, which is conducive to the formation of nanoparticles, but may lead to particle agglomeration. The model needs to adjust the cold trap temperature in real time to optimize the sphericity and uniformity of the particles. Steam flow rate affects the migration speed and uniformity of powder in the airflow. Excessive flow rate may lead to uneven particle distribution, while excessively slow flow rate may lead to sediment accumulation. The model should determine the optimal steam flow rate range to balance particle generation rate and quality control. Through a multiphysics coupled monitoring model, simulation and experimental verification can be performed to analyze the effects of different operating conditions on powder size, uniformity, and sphericity. The model should have real-time adjustment capabilities to ensure rapid response to parameter changes in actual production and optimize powder quality. Finally, by comprehensively considering negative pressure difference, cold trap temperature, and steam flow rate, the optimal flow rate range is determined to ensure the high quality of nanopowders.

[0027] S03. Construction of the Laval Nozzle Module: A Laval nozzle module based on negative pressure and cold trap tuning was constructed using data from a nanopowder growth module under multiphysics coupling. This module includes inlet and outlet diameters, throat diameter, and expansion section length. The inlet and outlet diameters directly affect the gas velocity distribution and particle acceleration process. The inlet diameter should be designed according to the inlet flow rate and velocity requirements to ensure sufficient gas inflow. The outlet diameter affects the acceleration of the airflow within the nozzle and the final particle outflow velocity. The throat diameter is the part of the nozzle where the gas velocity reaches its maximum value; its design needs to balance the requirements of airflow acceleration and particle formation. The throat diameter determines the degree of airflow compression, thus affecting the airflow velocity and particle kinetic energy within the nozzle. Through precise calculation and adjustment... The diameter of the throat can optimize airflow characteristics, ensuring the uniformity and sphericity of the powder. Optimizing these diameters can effectively control particle formation and collection efficiency. The expansion section is the part of the nozzle where the airflow gradually expands. Its length determines the expansion process of the airflow from the throat to the outlet. The design of the expansion section should consider the gas expansion behavior to reduce particle agglomeration during the flow process. An appropriate expansion section length can balance the airflow velocity and the final particle size, so that the particle morphology and distribution reach an ideal state, thereby improving airflow characteristics and nanoparticle formation. During the adjustment process, the negative pressure difference, cold trap temperature and steam flow rate are adjusted. Through a closed-loop control system, the airflow characteristics can be continuously optimized in actual production to ensure that the size, uniformity and sphericity of the nanoparticles meet the requirements.

[0028] S04. Micro-passivation treatment of nanoparticle surface: A combination of vapor deposition and mechanical mixing techniques is used to perform micro-passivation treatment on nanoparticle surface. The combination of vapor deposition and mechanical mixing can give full play to the advantages of both methods. Vapor deposition can uniformly deposit a passivation layer on the surface of nanoparticles, while mechanical mixing can further optimize the distribution and stability of the passivation layer. Combining these two techniques can achieve more efficient and uniform nanoparticle surface treatment, thereby significantly improving particle dispersibility and flowability, reducing the surface energy of powder, inhibiting particle agglomeration, and optimizing passivation treatment conditions, including gas type, gas flow rate and temperature, to ensure uniform passivation of nanoparticles in a fluidized state, forming a gas adsorption layer, reducing the van der Waals attraction thermal energy between particles, thereby reducing particle agglomeration and improving its performance in applications.

[0029] S05. Inertial large-scale storage of nanoparticles: This technology utilizes an integrated inert atmosphere-assisted powder collection and liquid-phase encapsulation technique for the large-scale storage, collection, and encapsulation of ultrafine nanoparticles. This technology involves using inert gas to maintain the stability of the powder and prevent it from reacting with oxygen or moisture in the air during storage and processing. Optimization of dispersant type, inert gas flow rate, and liquid-to-gas ratio improves the collection rate and encapsulation effect of the ultrafine powder. Different dispersants can alter the surface properties and flowability of the powder, affecting its distribution and collection efficiency in gas flow. Selecting a suitable dispersant can reduce powder aggregation, improve dispersion performance, and thus increase the powder collection rate. Gas flow rate directly affects the contact time and distribution uniformity of the powder with the gas during collection. An appropriate flow rate helps avoid powder sedimentation and agglomeration while ensuring uniform distribution in the powder collection device. The liquid-to-gas ratio in liquid-phase encapsulation is also crucial to the encapsulation effect. A reasonable liquid-to-gas ratio ensures that the powder is adequately protected during encapsulation, reducing its contact with the external environment and maintaining the integrity and quality of the powder.

[0030] In step S02, the design of the nanopowder growth module under multiphysics coupling includes several key components. First, the module integrates a negative pressure difference regulation system, which enables precise control of the pressure within the reaction chamber during powder growth, thereby optimizing the powder deposition process. Second, the cold trap temperature real-time regulation module ensures uniform cooling of the powder at different temperatures by finely controlling the cooling conditions, further improving the size uniformity and sphericity of the powder. Finally, the steam flow rate control module adjusts the airflow rate in real time to promote uniform distribution and synthesis of the powder. The coordinated operation of these systems ensures high-quality generation of nanopowders under different operating conditions, improving the consistency and performance of the overall product.

[0031] In step S03, the structural parameters of the Laval nozzle module are optimized using CFD-DEM coupled simulation technology. This process first uses computational fluid dynamics (CFD) to simulate the airflow characteristics inside the nozzle, accurately depicting the velocity, pressure, and temperature distribution of the flow field. Then, discrete element method (DEM) is used to simulate the motion and distribution of nanoparticles inside the nozzle. The coupled analysis of the two can provide a detailed understanding of the interaction between the airflow and the powder particles, thereby adjusting the geometric parameters of the nozzle, such as the throat diameter and diffusion angle, to optimize the flow field characteristics of the nozzle. This optimization design not only improves the stability of the flow field inside the nozzle but also significantly improves the uniformity of nanoparticle distribution, ensuring the high quality and consistency of the final powder product.

[0032] In step S04, the surface micro-passivation treatment of nanoparticles utilizes various gas types, including but not limited to nitrogen, argon, and helium. Nitrogen, due to its chemical inertness, effectively prevents oxidation reactions on the particle surface; argon provides a stable processing environment and reduces interference from other gases; while helium, with its excellent thermal conductivity and low density, helps to quickly and uniformly conduct heat. During the treatment, the selection and use of these gases can be adjusted according to specific needs to optimize the treatment effect. Furthermore, the processing temperature range is precisely set between -50°C and 300°C. This wide temperature range allows for flexible micro-passivation treatment of different types of nanoparticles. At low temperatures, the treatment helps control the reaction rate and the stability of the particle surface structure, while at high temperatures, it promotes the formation of a surface passivation layer and improves the chemical stability of the particles. By precisely adjusting the gas type and processing temperature, the surface properties of the nanoparticles can be accurately controlled to meet the needs of different applications.

[0033] In step S05, during the inert, large-scale storage liquid-phase encapsulation of nanoparticles, various types of dispersants are employed to ensure uniform dispersion of the ultrafine powder. These dispersants include, but are not limited to, surfactants and ion exchange resins. Surfactants help the powder particles disperse uniformly in the liquid phase and prevent agglomeration by reducing the interfacial tension between the liquid and the powder. Ion exchange resins, through their excellent ion exchange properties, further stabilize the dispersion of the powder and reduce the mutual attraction between particles. During encapsulation, the optimization of flow rate and liquid-to-gas ratio is crucial to ensuring uniform dispersion of the ultrafine powder. Appropriate flow rate control can prevent the powder from settling or becoming unevenly suspended in the liquid, while adjusting the liquid-to-gas ratio helps maintain the fluidity of the liquid phase and the dispersion effect of the gas, thereby ensuring the uniformity of the powder particle size and sphericity. By precisely adjusting these parameters, the high-quality characteristics of the powder can be maintained during encapsulation, avoiding performance differences caused by uneven dispersion.

[0034] In summary, this method for large-scale storage of high-purity nanoparticles utilizes stabilization technology and optimizes the processing and storage of nanoparticles through a series of refined steps. First, high-purity nanoparticles with particle sizes ranging from 10 nm to 40 nm are used for processing. Next, a multi-physics coupled nanoparticle growth module is constructed to monitor and optimize negative pressure difference, cold trap temperature, and vapor flow rate to ensure the size uniformity and sphericity of the powder. Then, based on an optimized Laval nozzle module, the airflow characteristics are improved, thereby enhancing the quality of powder formation. The nanoparticles undergo surface micro-passivation treatment through a combination of vapor deposition and mechanical mixing to reduce surface energy and suppress agglomeration. Finally, an inert atmosphere-assisted liquid-phase encapsulation technology, utilizing optimized dispersants, flow rates, and liquid-to-gas ratios, ensures uniform dispersion and efficient encapsulation of the ultrafine powder. This method comprehensively considers multiple factors, ensuring the high quality and stable performance of nanoparticles in large-scale storage.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for large-scale storage of high-purity nanopowders based on stabilization treatment technology, characterized in that: Includes the following steps: S01. High-purity nanopowder is used, wherein the particle size of the nanopowder is between 10 nm and 40 nm. S02. Construction of a nanopowder growth module under multi-physics coupling: Construct a monitoring model that considers the effects of negative pressure difference, cold trap temperature, and steam flow rate on nanopowder growth, analyze the influence of different operating conditions on powder size, uniformity, and sphericity, and determine the optimal flow rate range to ensure the high quality of nanopowder. S03. Construction of Laval Nozzle Module: Based on the data from the nanopowder growth module under multi-physics coupling, a Laval nozzle module based on negative pressure and cold trap tuning is constructed. This module includes inlet and outlet diameters, throat diameter, and expansion section length to improve airflow characteristics and nanoparticle formation. During the adjustment process, the negative pressure difference, cold trap temperature, and steam flow rate are adjusted to achieve the optimal effect of powder size, uniformity, and sphericity. S04. Micro-passivation treatment of nanoparticle surface: The nanoparticle surface is micro-passivated using a combination of vapor deposition and mechanical mixing to reduce the surface energy of the powder, inhibit particle agglomeration, and optimize the passivation treatment conditions, including gas type, gas flow rate and temperature, to ensure that the nanoparticles are uniformly passivated in a fluidized state, forming a gas adsorption layer and reducing the van der Waals attraction thermal energy between particles. S05. Inert large-scale storage of nanoparticles: The inert atmosphere-assisted powder collection and liquid phase encapsulation integrated technology is used for the large-scale storage, collection and encapsulation of ultrafine nanoparticles. The optimization of dispersant type, inert gas flow rate and liquid-gas ratio is used to improve the collection rate and encapsulation effect of ultrafine powders.

2. The method for large-scale storage of high-purity nanopowders based on stabilization treatment technology according to claim 1, characterized in that: The nanopowder growth module under multi-physics coupling in step S02 includes a module for real-time adjustment of negative pressure difference, cold trap temperature and steam flow rate to optimize the size uniformity and sphericity control of powder under different operating conditions.

3. The method for large-scale storage of high-purity nanopowders based on stabilization treatment technology according to claim 2, characterized in that: The structural parameters of the Laval nozzle module in step S03 are optimized through CFD-DEM coupled simulation to achieve optimal flow field characteristics and uniform distribution of nanopowder.

4. The method for large-scale storage of high-purity nanopowders based on stabilization treatment technology according to claim 3, characterized in that: The gas types for the micro-passivation treatment of nanoparticle surfaces in step S04 include, but are not limited to, nitrogen, argon, and helium, and the treatment temperature range is -50°C to 300°C.

5. The method for large-scale storage of high-purity nanopowders based on stabilization treatment technology according to claim 4, characterized in that: In step S05, the dispersant in the inert, large-scale storage liquid-phase encapsulation of nanoparticles includes, but is not limited to, surfactants and ion exchange resins. The optimization of the flow rate and liquid-to-gas ratio ensures that the ultrafine powder is uniformly dispersed during the encapsulation process, thus guaranteeing its particle size uniformity and sphericity.

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