Multi-stage continuous grinding method for ceramic powder

Abstract

The invention discloses a multi-stage continuous grinding method for ceramic powder. The multi-stage continuous grinding method has the following beneficial effects that (1) the grinding efficiency is improved, specifically, a multi-stage continuous grinding mode is adopted, so that the grinding efficiency can be effectively improved, and the energy consumption is reduced; (2) powder pollution is reduced: a closed-loop circulation system that powder output by a third-stage grinding machine is fed back to a second-stage grinding machine for sieving and classification is adopted, so that the powder pollution can be effectively reduced; (3) controlling the particle size of the powder, namely effectively controlling the particle size and particle size distribution of the powder by adopting different grinding media and grinding rotating speeds; (4) intelligent control: the rotating speed of a grinding machine of the grinding equipment can be adjusted in real time according to the grinding stage and the powder particle size distribution, so that the grinding efficiency and the grinding ball loss are optimized; (5) cost reduction: compared with a traditional chemical method, the cost can be reduced, and the process is simple; and (6) green and environmental protection: compared with a traditional chemical method, the grinding method disclosed by the invention does not generate a large amount of environmental pollution.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic powder grinding, in particular to a multi-stage continuous grinding method for ceramic powder. Background Art

[0002] Alumina ceramic materials are widely used in electronics, machinery, aerospace and other fields due to their excellent physical and chemical properties. The performance of alumina ceramic materials is closely related to their microstructure, which in turn is closely related to factors such as the particle size, particle size distribution and morphology of the powder. Therefore, the key to preparing high-performance alumina ceramic materials is to obtain alumina powder, i.e. ceramic powder, with fine particle size, uniform particle size distribution and regular morphology.

[0003] At present, the preparation methods of alumina powder mainly include mechanical grinding and chemical method; mechanical grinding method: use ball mill, vibration mill and other equipment to grind the alumina raw materials to obtain fine particle size powder; chemical method: use precipitation method, sol-gel method and other chemical methods to prepare alumina powder, which can obtain powder with finer particle size and more regular morphology.

[0004] However, the traditional mechanical grinding method has the following disadvantages: low grinding efficiency: single-stage grinding cannot effectively grind the alumina raw materials to the nanometer level; high energy consumption: mechanical grinding requires a lot of energy; powder pollution: powder pollution is easily generated during the grinding process; grinding ball loss control: the grinding process has a large grinding ball loss, and the mixing of the slurry causes large fluctuations in the composition, which also leads to increased costs.

[0005] The traditional chemical method for preparing alumina powder has the following disadvantages: complex process: the chemical preparation process is complicated and difficult to operate; high cost: the chemical preparation cost is relatively high; environmental pollution: the chemical preparation will cause certain environmental pollution. Summary of the invention

[0006] 1. Technical issues to be solved

[0007] In view of the shortcomings of the prior art, the present invention provides a multi-stage continuous grinding method for ceramic powder, aiming to overcome the shortcomings of the prior art and provide an efficient, energy-saving and environmentally friendly method for preparing alumina powder to meet the needs of preparing high-performance alumina ceramic materials.

[0008] (II) Technical solution

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: a multi-stage continuous grinding method of ceramic powder, comprising the following steps:

[0010] S1, putting the alumina raw material into the first-stage grinder for coarse grinding to output the first powder;

[0011] S2, putting the first powder into the second-stage grinding machine for fine grinding to output the second powder;

[0012] S3, putting the second powder into the third-stage grinding machine for ultrafine grinding to output the third powder;

[0013] S4, the third powder is returned to the second-stage grinder for screening and classification, and further, the third powder that meets the requirements is collected, and the third powder that does not meet the requirements is left in the second-stage grinder for further grinding.

[0014] Preferably, the first-stage grinder is provided with a first output port, the second-stage grinder is provided with a first input port, and the first powder enters the first input port from the first output port through a first pipeline.

[0015] Preferably, the second-stage grinder is provided with a second output port, the third-stage grinder is provided with a second input port, and the second powder enters the second input port from the second output port through the second pipeline.

[0016] Preferably, the third-stage grinder is provided with a third output port, the second-stage grinder is provided with a third input port, and the third powder enters the third input port from the third output port through a third pipeline.

[0017] Preferably, the second-stage grinder is provided with a fourth output port, wherein a screening device is provided in the fourth output port; in step S4, the third powder meeting the requirements is collected through the fourth output port.

[0018] Preferably, grinding balls of different sizes are arranged in the first-stage grinding mill.

[0019] Preferably, grinding balls of different sizes are arranged in the second-stage grinding mill.

[0020] Preferably, grinding balls of different sizes are arranged in the third-stage grinding mill.

[0021] Preferably, the first-stage grinder, the second-stage grinder and the third-stage grinder use different grinding media.

[0022] Preferably, during the grinding process, the rotation speed of the grinding machine is automatically adjusted according to the measured particle size data.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the present invention provides a method for multi-stage continuous grinding of ceramic powder, which has the following beneficial effects: (1) improving grinding efficiency: the present invention adopts a multi-stage continuous grinding method of a three-stage grinder to effectively improve grinding efficiency and reduce energy consumption; (2) reducing powder pollution: the present invention adopts a closed-loop circulation system in which the powder output from the third-stage grinder is returned to the second-stage grinder for screening and classification, which can effectively reduce powder pollution; (3) controlling the powder particle size: using different grinding media and grinding speeds, the particle size and particle size distribution of the powder can be effectively controlled; (4) intelligent control: the present invention can adjust the mill speed of the grinding equipment in real time according to the grinding stage and the powder particle size distribution to optimize the grinding efficiency and grinding ball loss; (5) reducing costs: compared with traditional chemical methods, the grinding method of the present invention can reduce costs and has a simple process; (6) green and environmentally friendly: compared with traditional chemical methods, the grinding method of the present invention does not generate a large amount of environmental pollution, thus achieving green and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a first flow chart of a multi-stage continuous grinding method for ceramic powder according to the present invention;

[0026] Figure 2 A second flow chart of a multi-stage continuous grinding method for ceramic powder according to the present invention;

[0027] Figure 3 The third flow chart of a multi-stage continuous grinding method of ceramic powder of the present invention;

[0028] Figure 4 It is a structural block diagram of each grinding machine of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention provides a multi-stage continuous grinding method for ceramic powder, comprising the following steps:

[0031] S1. Put the alumina raw material into the first-stage grinder for coarse grinding to output the first powder.

[0032] S2, putting the first powder into the second-stage grinding machine for fine grinding to output the second powder.

[0033] Specifically, the first-stage grinder is provided with a first output port, and the second-stage grinder is provided with a first input port. The first powder enters the first input port from the first output port through the first pipeline, thereby inputting the first powder into the second-stage grinder.

[0034] S3, putting the second powder into the third-stage grinding machine for ultrafine grinding to output the third powder.

[0035] Specifically, the second-stage grinder is provided with a second output port, the third-stage grinder is provided with a second input port, and the second powder enters the second input port from the second output port through the second pipeline, that is, the second powder is put into the third-stage grinder.

[0036] S4, the third powder is returned to the second-stage grinder for screening and classification, and further, the third powder that meets the requirements is collected, and the third powder that does not meet the requirements is left in the second-stage grinder for further grinding.

[0037] Specifically, the third-stage grinder is provided with a third output port, the second-stage grinder is provided with a third input port, and the third powder enters the third input port from the third output port through the third pipeline, thereby returning the third powder to the second-stage grinder.

[0038] Specifically, the second-stage grinder is provided with a fourth output port, wherein a screening device is provided in the fourth output port, and the mesh number of the screening device corresponds to the final target particle size of the ceramic powder grinding process. The compliance with the requirements mentioned in the above step S4 specifically refers to the particle size meeting the requirements. It can be understood that if the third powder thrown back from the third-stage grinder to the second-stage grinder can pass through the screening device, it corresponds to the third powder with a particle size meeting the requirements. On the contrary, if the third powder cannot pass through the screening device, it corresponds to the third powder that does not meet the requirements.

[0039] In the above step S4, the third powder that meets the requirements is collected through the fourth output port, that is, the third powder with a particle size that meets the requirements is collected through the screening device and the fourth output port; and the third powder with a particle size that does not meet the requirements is left in the second-stage grinder for further grinding, and the above steps S2-S4 are repeated until the powder particle size meets the requirements.

[0040] Preferably, the first-stage grinder is provided with grinding balls of different sizes for coarse grinding of the alumina raw material, that is, the grinding balls in the first-stage grinder are proportioned according to different sizes. The second-stage grinder is provided with grinding balls of different sizes for fine grinding of the powder, that is, the grinding balls in the second-stage grinder are proportioned according to different sizes. The third-stage grinder is provided with grinding balls of different sizes for ultrafine grinding of the powder, that is, the grinding balls in the third-stage grinder are proportioned according to different sizes. Further, preferably, the grinding balls in each stage of the grinder adopt the following size proportioning method: in each grinder, grinding balls of different sizes are used to form a graded distribution. The first-stage grinder (coarse grinding) can use larger-sized grinding balls (e.g., diameters of 10mm, 8mm, 5mm, with respective proportions of 40%, 30%, 30%); the second-stage grinder (fine grinding) can use medium-sized grinding balls (e.g., diameters of 0.8mm, 0.6mm, 0.4mm, with respective proportions of 30%, 40%, 30%); the third-stage grinder (ultrafine grinding) can use smaller-sized grinding balls (e.g., diameters of 0.2mm, 0.3mm, with respective proportions of 50%, 50%). The grinding ball grading ratios described above can improve grinding efficiency, shorten grinding time, and improve production efficiency: larger-sized grinding balls are used for primary crushing, and smaller-sized grinding balls are used for subsequent fine grinding, which can reduce grinding time and energy consumption, while obtaining a narrower particle size distribution.

[0041] Preferably, the first-stage grinder, the second-stage grinder, and the third-stage grinder use different grinding media: First-stage grinder (coarse grinding): You can choose a larger-sized, wear-resistant grinding media, such as: ceramic balls, which have high hardness and corrosion resistance and can reduce powder pollution; or, zirconium balls: higher hardness and better wear resistance, but the price is also higher. Second-stage grinder (fine grinding): You can choose a medium-sized grinding media, and consider the shape and surface characteristics of the media: ceramic balls / zirconium balls (smaller size), that is, continue to use a certain material of the previous-stage grinding media, but reduce the size for finer grinding. Third-stage grinder (ultrafine grinding): You can choose a smaller and lighter grinding media, and consider the material and surface treatment of the media: zirconium balls (extremely small size), which have high hardness and good wear resistance and can reduce powder pollution, but the price is higher; or, ceramic balls (extremely small size), which have high hardness and corrosion resistance and can reduce powder pollution. In addition, the first-stage grinder, the second-stage grinder, and the third-stage grinder may be different types of grinders such as a ball mill, a vibration mill, and a planetary mill.

[0042] In addition, preferably, the present invention automatically adjusts the rotation speed of the grinder according to the measured particle size data during the grinding process: according to the loss of grinding balls in the equipment process, a corresponding relationship of the grinding machine speed is designed. During the above-mentioned coarse grinding, fine grinding, ultrafine grinding and other material grinding processes, the present invention is equipped with an AI intelligent control system, which can automatically adjust the rotation speeds of the first-stage grinder, the second-stage grinder, the third-stage grinder and other grinders according to the measured particle size data in different time periods, so as to achieve lower grinding ball loss.

[0043] The system architecture of the above-mentioned AI intelligent control system includes a particle size measurement system, a data acquisition and transmission module, a central control system, a grinder control system, and a monitoring and display system: the particle size measurement system is used to measure the particle size of the powder in the first-stage grinder, the second-stage grinder, and the third-stage grinder; the data acquisition and transmission module is used to collect and transmit data information such as particle size; the grinder control system is used to receive control instructions from the central control system to control the rotation speed of the first-stage grinder, the second-stage grinder, the third-stage grinder, etc.; the monitoring and display system is used to monitor and display grinding information such as particle size and rotation speed.

[0044] Central control system: It is the core part of AI intelligent control system. It is responsible for calculating and outputting the optimal grinding machine speed using AI algorithm according to particle size data, preset target particle size range, and existing experimental data (grinding ball loss-speed-particle size relationship curve); the output of AI algorithm is based on the mapping of training data such as grinding ball loss, speed, particle size, etc. Specifically, the AI ​​algorithm of existing technology can be used, such as linear regression: grinding machine speed = a*particle size + b (where a and b are parameters learned through training data). Data input: In addition to particle size data and target particle size range, it also includes grinding ball loss-particle size relationship curve data, which requires a large amount of measurement and recording of grinding ball loss. AI algorithm training: The AI ​​algorithm model is trained using existing experimental data (including speed-particle size relationship and grinding ball loss-particle size relationship). The model needs to be fully verified and tested to ensure that it can effectively control the particle size while considering grinding ball loss. Grinding ball loss data accuracy: The accuracy of grinding ball loss data directly affects the performance of AI algorithm, and requires precise measurement methods and strict quality control. Effectively optimizing the grinding process, improving production efficiency and reducing production costs still requires adjustment and optimization based on actual conditions, and continuous monitoring and improvement remain crucial.

[0045] Compared with the prior art, the present invention provides a method for multi-stage continuous grinding of ceramic powder, which has the following beneficial effects: (1) improving grinding efficiency: the present invention adopts a multi-stage continuous grinding method of a three-stage grinder to effectively improve grinding efficiency and reduce energy consumption; (2) reducing powder pollution: the present invention adopts a closed-loop circulation system in which the powder output from the third-stage grinder is returned to the second-stage grinder for screening and classification, which can effectively reduce powder pollution; (3) controlling the powder particle size: using different grinding media and grinding speeds, the particle size and particle size distribution of the powder can be effectively controlled; (4) intelligent control: the present invention can adjust the mill speed of the grinding equipment in real time according to the grinding stage and the powder particle size distribution to optimize the grinding efficiency and grinding ball loss; (5) reducing costs: compared with traditional chemical methods, the grinding method of the present invention can reduce costs and has a simple process; (6) green and environmentally friendly: compared with traditional chemical methods, the grinding method of the present invention does not generate a large amount of environmental pollution, thus achieving green and environmental protection.

[0046] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage continuous grinding method for ceramic powder, characterized in that: The following steps are involved: S1, putting the alumina raw material into the first-stage grinder for coarse grinding to output the first powder; S2, putting the first powder into a second-stage grinder for fine grinding to output a second powder; S3, putting the second powder into a third-stage grinding machine for ultrafine grinding to output a third powder; S4, returning the third powder to the second-stage grinder for screening and classification, further collecting the third powder that meets the requirements, and leaving the third powder that does not meet the requirements in the second-stage grinder for further grinding.

2. The ceramic powder multi-stage continuous grinding method according to claim 1, characterized in that: The first-stage grinder is provided with a first output port, the second-stage grinder is provided with a first input port, and the first powder enters the first input port from the first output port through a first pipeline.

3. The ceramic powder multi-stage continuous grinding method according to claim 2, characterized in that: The second-stage grinder is provided with a second output port, the third-stage grinder is provided with a second input port, and the second powder enters the second input port from the second output port through a second pipeline.

4. The ceramic powder multi-stage continuous grinding method according to claim 3, characterized in that: The third-stage grinder is provided with a third output port, the second-stage grinder is provided with a third input port, and the third powder enters the third input port from the third output port through a third pipeline.

5. The method for multi-stage continuous grinding of ceramic powder according to claim 4, characterized in that: The second-stage grinder is provided with a fourth output port, wherein the fourth output port is provided with a screening device; in the step S4, the third powder that meets the requirements is collected through the fourth output port.

6. The ceramic powder multi-stage continuous grinding method according to claim 1, characterized in that: The first-stage grinding machine is provided with grinding balls of different sizes.

7. The ceramic powder multi-stage continuous grinding method according to claim 1, characterized in that: The second-stage grinding machine is provided with grinding balls of different sizes.

8. The ceramic powder multi-stage continuous grinding method according to claim 1, characterized in that: The third-stage grinding machine is provided with grinding balls of different sizes.

9. The ceramic powder multi-stage continuous grinding method according to claim 1, characterized in that: The first-stage grinder, the second-stage grinder and the third-stage grinder use different grinding media.

10. The ceramic powder multi-stage continuous grinding method according to claim 1, characterized in that: During the grinding process, the grinding machine speed is automatically adjusted according to the measured particle size data.

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