Preparation system and preparation process for zinc powder with regular atomization morphology

Abstract

The preparation system and the preparation process for the zinc powder with the regular atomization morphology comprise a melting furnace, an atomization system, a cooling system and a collecting system, the atomization system comprises an atomization chamber, a connecting pipeline, a nozzle and an air compressor, the atomization chamber is located below the melting furnace, the nozzle is located at the top of the atomization chamber, and the air compressor is located below the atomization chamber. The connecting pipeline is connected with the nozzle, the melting furnace and the air compressor, the air compressor is arranged on the outer side of the atomizing chamber, and the cooling system is located in the atomizing chamber and comprises an air cooling area, a spray cooling area and a magnetic field cooling area. The air cooling area, the spray cooling area and the magnetic field cooling area are sequentially and vertically arranged in the atomizing chamber, the collecting system comprises a vibrating screen and a cyclone separator, the collecting system is located below the atomizing chamber, an air inlet of the cyclone separator is connected with the atomizing chamber, an air outlet is formed in the top of the cyclone separator, and the collecting system is connected with the atomizing chamber. A hopper is arranged at the bottom.

Description

Technical Field

[0001] The invention relates to the technical field of metal powder preparation, and in particular to a system and a process for preparing atomized zinc powder with regular morphology. Background Art

[0002] There are many methods for preparing zinc powder, including atomization, chemical reduction, mechanical crushing and electrolysis. Among them, the atomization method is widely used because of its strong adaptability and ability to better control powder properties. The principle of preparing zinc powder by traditional atomization is mainly to use high-pressure gas medium to atomize zinc liquid into fine metal powder, but the traditional atomization preparation process has the following disadvantages: 1. In the traditional atomization process, the zinc liquid is impacted only by the atomizing gas. The surface tension of the zinc liquid is large and it is difficult to be fully broken, resulting in large and uneven zinc powder particle size.

[0003] 2. The traditional process may only use a single cooling method of air cooling or water cooling, which may cause the zinc powder particles to deform due to excessively fast or uneven cooling speed.

[0004] 3. The zinc powder prepared by the traditional atomization method has a large average particle size, a low fine powder output rate, and the particle shape and size are not uniform enough. In addition, the traditional collection accuracy is low and the recovery rate is not high. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems and to propose a system and process for preparing zinc powder with regular atomized morphology.

[0006] In order to achieve the above purpose, the following technical solutions are adopted: A preparation system and preparation process of zinc powder with regular atomization morphology, comprising a melting furnace, an atomization system, a cooling system and a collection system, wherein the atomization system comprises an atomization chamber, a connecting pipe, a nozzle and an air compressor, wherein the atomization chamber is arranged below the melting furnace, the nozzle is located at the top of the atomization chamber, the connecting pipe connects the nozzle, the melting furnace and the air compressor respectively, an ultrasonic device is arranged above the nozzle, the air compressor is arranged outside the atomization chamber, the cooling system is located inside the atomization chamber, the cooling system comprises an air cooling zone, a spray cooling zone and a magnetic field cooling zone, the air cooling zone, the spray cooling zone and the magnetic field cooling zone are arranged vertically inside the atomization chamber in sequence, the collection system comprises a vibrating screen and a cyclone separator, the vibrating screen is below the atomization chamber, the discharge port of the vibrating screen is connected to the air inlet of the cyclone separator, the top of the cyclone separator is provided with an air outlet, and the bottom is provided with a hopper.

[0007] Preferably, the connecting pipeline includes a liquid pipeline and a gas pipeline, the liquid pipeline is spiral, and the two ends of the liquid pipeline are respectively connected to the melting furnace and the nozzle, the ultrasonic device is arranged at one end close to the nozzle, and a regulating valve is arranged at the other end of the liquid pipeline, and the ultrasonic frequency of the ultrasonic device is 20-30 kHz.

[0008] Preferably, both ends of the gas pipeline are connected to the air compressor and the nozzle respectively, a pressure regulating valve is provided on the gas pipeline, a pressure sensor is provided inside the pressure regulating valve, and the gas pressure in the gas pipeline is 0.7 - 0.9 MPa.

[0009] Preferably, the atomization chamber is divided into four sections, namely an atomization zone, an air cooling zone, a spray cooling zone and a magnetic field cooling zone, and the inner wall of the atomization chamber is coated with a waterproof coating.

[0010] Preferably, the system and process for preparing zinc powder with regular atomized morphology as described in claim 4 are characterized in that: the air cooling zone is provided with a plurality of air outlets, a fan is provided inside the air outlet, the air outlet is inclined upward by 30°~40°, and a baffle is provided above the air outlet.

[0011] Preferably, the spray cooling zone is provided with a nozzle array and a liquid storage tank, the nozzle array is arranged inside the atomization chamber, and the liquid storage tank is located outside the atomization chamber.

[0012] Preferably, the bottom of the magnetic field cooling zone is funnel-shaped, and an electromagnetic coil and a water cooling system are provided in the magnetic field cooling zone. The electromagnetic coil is located inside the atomization chamber, and the water cooling system is located outside the electromagnetic coil. The magnetic field strength is 0.1-1 Tesla.

[0013] Preferably, a molecular sieve is provided at the inlet of the collection system, a vibrating screen is provided in the collection system, the motor is located below the vibrating screen, the vibrating screen is connected to the motor through a transmission belt, and the cyclone separator is located on the side of the vibrating screen.

[0014] Preferably, the zinc powder preparation comprises the following steps: S1: Melting the zinc block. Put the cleaned zinc block into the melting furnace, and melt the zinc block into liquid at a temperature of 425℃~435℃ in the furnace; S2: Atomizing zinc liquid. The molten zinc liquid flows into the nozzle through the liquid pipe, and the ultrasonic device performs ultrasonic vibration on the zinc liquid. At the same time, the air compressor introduces high-purity nitrogen into the nozzle through the gas pipe, and the high-pressure nitrogen sprays the molten zinc liquid into a mist; S3: Air cooling. The atomized zinc powder enters the air cooling zone, and the fan in the atomization zone generates an upward spiral airflow with a temperature of 20℃ - 25℃. The airflow reduces the temperature of the zinc powder according to the heat exchange principle and air convection; S4: Spray cooling. In the spray cooling area, the nozzle sprays deionized water at a temperature of 10℃ - 12℃ evenly on the zinc powder in the form of tiny droplets, and the water droplets further reduce the temperature of the zinc powder; S5: After air cooling and spray cooling, the zinc powder enters the magnetic field cooling zone. Under the action of the magnetic field, the magnetic moments of zinc atoms tend to align along the direction of the magnetic field. At the same time, their magnetic moments interact with each other to generate a force that prevents them from getting closer. Then the zinc powder relies on natural heat exchange with the surrounding air to reduce its temperature. S6: Zinc powder collection. Screens of different mesh sizes are used to grade and screen the zinc powder according to the size of the particles. The fine particles not intercepted by the vibrating screen enter the cyclone separator, and a rotating airflow is formed in the cylinder. The zinc powder particles are large in mass and are thrown to the wall of the cylinder under the action of centrifugal force. They fall along the wall under the action of gravity and are finally collected in the hopper. The rotating airflow is discharged from the exhaust port.

[0015] Preferably, in step S6, the vibrating screen has three layers, the upper layer screen is 120-150 mesh, the middle layer is 220-250 mesh, and the lower layer is 320-350 mesh.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging an ultrasonic device and a regulating valve on the liquid pipeline, the flow rate of the zinc liquid is accurately controlled and the surface tension of the zinc liquid is reduced; and a pressure sensor and a pressure regulating valve are also arranged on the gas pipeline to reduce the influence of pressure on the atomization effect, so that the zinc liquid can be fully and evenly broken into tiny droplets.

[0017] In addition, a three-stage cooling system is adopted, which combines air cooling, spray cooling and magnetic field cooling. In the air cooling stage, the fan and airflow design are reasonably arranged to achieve initial uniform cooling and inhibit agglomeration. In the spray cooling stage, the temperature of ionized water and zinc powder is exchanged to avoid particle deformation while cooling rapidly. In the magnetic field cooling stage, zinc atoms have a certain magnetic moment. Under the action of the magnetic field, the magnetic moment of zinc atoms tends to be arranged along the direction of the magnetic field, which can also affect the nucleation rate and grain growth rate in the crystallization process of zinc powder. In the cooling process, zinc powder particles tend to approach each other and agglomerate due to the action of surface energy and van der Waals force. Then the zinc powder slowly cools to room temperature to reduce the influence of thermal stress and ensure that the zinc powder can maintain good morphology and particle size during the cooling process.

[0018] The multi-level vibrating screen collects zinc powder in layers according to particle size to achieve high-precision classification; the cyclone separator collects fine particles to improve the total recovery rate, reduce raw material waste, and lower production costs. With the mutual cooperation of the atomization system, cooling system and collection system, zinc powder particles with regular morphology are prepared. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the equipment structure of a system and process for preparing atomized zinc powder with regular morphology according to Example 1 of the present invention; Figure 2 Schematic diagram of an atomization system for preparing atomized zinc powder with regular morphology and a preparation process according to Example 1 of the present invention; Figure 3 Schematic diagram of the cooling system of the atomized regular morphology zinc powder preparation system and preparation process according to Example 1 of the present invention; Figure 4 This is a schematic diagram of a collection system for preparing atomized zinc powder with regular morphology and a preparation process according to Example 1 of the present invention; Figure 5 This is a schematic diagram of the preparation process of the atomized regular morphology zinc powder preparation system and preparation process according to Example 1 of the present invention; DETAILED DESCRIPTION

[0020] Hereinafter, the system and process for preparing atomized zinc powder with regular morphology of the present invention will be described in detail with reference to the accompanying drawings.

[0021] like Figure 1 As shown, the atomization morphology regular zinc powder preparation system comprises a melting furnace 1, an atomization system 2, a cooling system 3 and a collection system 4, the atomization system 2 comprises an atomization chamber 21, a connecting pipe 22, a nozzle 23 and an air compressor 24, the atomization chamber 21 is arranged below the melting furnace 1, the nozzle 23 is located at the top of the atomization chamber 21, the connecting pipe 22 connects the nozzle 23, the melting furnace 1 and the air compressor 24 respectively, an ultrasonic device 25 is arranged above the nozzle 23, the air compressor 24 is arranged outside the atomization chamber 21, and the cooling system 3 Located inside the atomization chamber 21, the cooling system 3 includes an air cooling zone 31, a spray cooling zone 32 and a magnetic field cooling zone 33, and the air cooling zone 31, the spray cooling zone 32 and the magnetic field cooling zone 33 are arranged vertically in sequence inside the atomization chamber 21; the collecting system 4 includes a vibrating screen 41 and a cyclone separator 42, the vibrating screen 41 is located below the atomization chamber 21, the discharge port of the vibrating screen 41 is connected to the air inlet of the cyclone separator 42, the top of the cyclone separator 42 is provided with an air outlet 421, and the bottom is provided with a hopper 422.

[0022] like Figure 2As shown, preferably, the connecting pipeline 22 includes a liquid pipeline 221 and a gas pipeline 222, the liquid pipeline 221 is spiral, and both ends of the liquid pipeline 221 are respectively connected to the melting furnace 1 and the nozzle 23, the ultrasonic device 25 is arranged at one end of the liquid pipeline 221 close to the nozzle 23, and the other end of the liquid pipeline 221 is provided with a regulating valve 26, and the ultrasonic frequency of the ultrasonic device 25 is 20-30 kHz.

[0023] Preferably, both ends of the gas pipeline 222 are connected to the air compressor 24 and the nozzle 23 respectively, and a pressure regulating valve 241 is provided on the gas pipeline 222. The gas pressure in the gas pipeline 222 is 0.7-0.9 MPa.

[0024] The spiral liquid pipeline can make the zinc liquid flow out of the atomizer at a more stable flow rate, ensuring the stability of the atomization effect, thereby improving the uniformity of the zinc powder particle size. The regulating valve 26 can accurately control the outflow rate of the zinc liquid to ensure that the zinc liquid flows into the nozzle 23 at a stable speed. The 20-30 kHz ultrasonic vibration generated by the ultrasonic device 25 acts on the zinc liquid, which can effectively reduce the surface tension of the zinc liquid and help the zinc liquid to be better atomized. The zinc powder particles are more uniform in the initial stage of formation and are easier to form spherical zinc powder particles. The pressure regulating valve 241 can adjust the atomizing gas pressure. When used in conjunction with the ultrasonic device 25 and the regulating valve 26, the particle size and morphology of the zinc powder can be more finely controlled to produce high-quality zinc powder products.

[0025] like Figure 3 As shown, preferably, the atomization chamber 21 is divided into four sections, namely an atomization zone 27 , an air cooling zone 31 , a spray cooling zone 32 and a magnetic field cooling zone 33 , and the inner wall of the atomization chamber 21 is coated with a waterproof coating 28 .

[0026] Preferably, the air cooling zone 31 is provided with a plurality of air outlets 311 , a fan 312 is provided inside the air outlet 311 , the air outlet 311 is inclined upward by 30°-40°, and a baffle 313 is provided above the air outlet 311 .

[0027] Preferably, a spray head array 321 and a liquid storage tank 322 are provided on the spray cooling zone 32 . The spray head array 321 is arranged inside the atomization chamber 21 , and the liquid storage tank 322 is located outside the atomization chamber 21 .

[0028] Preferably, the bottom of the magnetic field cooling zone 33 is funnel-shaped, and an electromagnetic coil 331 and a water cooling system 332 are provided in the magnetic field cooling zone 33. The electromagnetic coil 331 is located inside the atomization chamber 21, and the water cooling system 332 is located outside the electromagnetic coil 331. The magnetic field strength is 0.1-1 Tesla.

[0029] The multi-stage cooling system 3 is composed of the air cooling zone 31, the spray cooling zone 32 and the magnetic field cooling zone 33. The uniform air cooling in the cold air zone 31 can keep the zinc powder in a relatively stable state during the initial cooling process. Keeping the air outlet 311 tilted upward at an angle of 30° to 40° can make the air flow spiral upward, thereby forming an "air column". The area where the zinc powder falls is surrounded to avoid deformation of the zinc powder particles due to excessively fast or too slow local cooling; the spray cooling area 32 sprays deionized water to ensure rapid cooling of the zinc powder while avoiding deformation of the zinc powder particles due to rapid cooling; the magnetic field in the magnetic field cooling area 33 can increase the number of crystal nuclei formed in the zinc liquid and inhibit the growth of grains. The zinc powder grains will be more regular and the crystal integrity will be better, thereby making the zinc powder grains finer and more uniform. In addition, due to the effects of surface energy and van der Waals force, the magnetic field can also effectively offset the agglomeration force between the particles, so that a larger distance between the particles is maintained and agglomeration is reduced. The zinc powder relies on natural heat exchange between itself and the surrounding air to reduce the temperature and slowly drops to room temperature, thereby reducing the influence of thermal stress on the morphology of the zinc powder and allowing the zinc powder to complete the solidification process under relatively mild conditions and maintain a regular shape.

[0030] Furthermore, since the electromagnetic coil 331 is located inside the atomizing chamber 21, and is separated from the zinc powder falling area by the inner wall of the atomizing chamber of a certain thickness, the electromagnetic coil and the zinc powder are separated by a certain distance, which can prevent the magnetic field force from affecting the falling motion trajectory of the zinc powder. Moreover, the water cooling system is adjacent to the electromagnetic coil, which can prevent the heat generated by the electromagnetic coil from affecting the cooling efficiency of the zinc powder.

[0031] like Figure 4 As shown, preferably, a multi-stage vibrating screen 41 is provided in the collection system 4 , a motor 411 is located below the vibrating screen 41 , the vibrating screen 41 and the motor 411 are connected via a transmission belt, and a cyclone separator 42 is located on the side of the vibrating screen 41 .

[0032] The multi-layer graded vibrating screen 41 can prevent zinc powders of different particle sizes from colliding and squeezing each other during the collection process, thereby preventing the particle morphology from being destroyed. The cyclone separator 42 is used to collect fine particles not retained by the screen, thereby optimizing the collection effect of zinc powder, further ensuring the integrity of zinc powder particles during the collection process, and maintaining their regular morphology.

[0033] like Figure 5 As shown, the zinc powder preparation process includes the following steps: S1: Melting the zinc block. The cleaned zinc block is placed in a melting furnace 1, and the temperature in the furnace is 425°C to 435°C to melt the zinc block into liquid.

[0034] S2: Atomizing zinc liquid. The molten zinc liquid flows into the nozzle 23 through the liquid pipe 221, and the ultrasonic device 25 performs ultrasonic vibration on the zinc liquid. At the same time, the air compressor 24 passes high-purity nitrogen gas into the nozzle 23 through the gas pipe 222, and the high-pressure nitrogen gas sprays the molten zinc liquid into a mist.

[0035] S3: Air cooling. The atomized zinc powder enters the air cooling zone 31, and the fan 312 in the atomization zone generates an upward spiral airflow with a temperature of 20°C - 25°C. The airflow reduces the temperature of the zinc powder according to the heat exchange principle and air convection.

[0036] S4: Spray cooling. In the spray cooling zone 32, the spray head sprays deionized water at a temperature of 10°C - 12°C evenly on the zinc powder in the form of tiny droplets, and the water droplets further reduce the temperature of the zinc powder.

[0037] S5: Magnetic field cooling. After air cooling and spray cooling, the zinc powder enters the magnetic field cooling zone 33. Under the action of the magnetic field, the magnetic moments of the zinc atoms tend to be arranged along the direction of the magnetic field. At the same time, their magnetic moments interact with each other to generate a force that prevents them from getting closer. Then the zinc powder relies on the natural heat exchange between itself and the surrounding air to reduce the temperature.

[0038] S6: Zinc powder collection. Screens of different mesh sizes are used to grade and screen the zinc powder particles according to their size. Fine particles not retained by the vibrating screen 41 enter the cyclone separator 42, and a rotating airflow is formed in the cylinder. The zinc powder particles are relatively large in mass and are thrown toward the wall of the cylinder under the action of centrifugal force. They fall along the wall under the action of gravity and are finally collected in the hopper 422. The rotating airflow is discharged from the exhaust port 421.

[0039] Preferably, in step S6, the vibrating screen 41 has three layers, the upper layer screen is 120-150 mesh, the middle layer is 220-250 mesh, and the lower layer is 320-350 mesh.

[0040] In this embodiment, a zinc block is placed in a melting furnace, and the temperature in the melting furnace 1 is raised to 430° C. to completely melt the zinc block. The molten zinc liquid flows out through the liquid pipe 221. The regulating valve 26 controls the smooth outflow of the zinc liquid. The ultrasonic device 25 performs ultrasonic vibration on the zinc liquid to reduce the surface tension of the zinc liquid. When the zinc liquid flows out from the liquid channel 221 and enters the nozzle 23, high-pressure and high-purity nitrogen is ejected at high speed from the air compressor 24 along the gas channel 222. The nitrogen in the nozzle 23 impacts the zinc liquid flow at a suitable angle to impact the zinc liquid into tiny droplets.

[0041] The atomized zinc droplets enter the air cooling zone 31, and the fan blows out airflow to surround the zinc powder falling area, initially reducing the temperature of the zinc powder. Then the zinc powder enters the spray cooling zone 32, and the nozzle array 321 sprays deionized water on the zinc powder. Through the principles of heat transfer and evaporative cooling, the zinc powder is quickly cooled while avoiding particle deformation due to rapid cooling. After spray cooling, the zinc powder enters the magnetic field cooling zone 33. Under the action of the magnetic field, the magnetic moment of the zinc atoms tends to be arranged along the direction of the magnetic field, which helps to form a more regular crystal structure and will be affected by the force of the magnetic field, thereby reducing agglomeration. Then, it slowly cools to room temperature by relying on its own natural heat exchange with the surrounding air and enters the collection system 4.

[0042] When zinc powder falls from the atomization chamber 21 onto the vibrating screen 41, smaller particles will pass through the mesh of the upper screen and fall onto the next screen through vibration, while larger particles will remain on the corresponding screen. The vibrating screen 41 is connected to the cyclone separator 42, and the airflow containing zinc powder enters the cylinder at high speed from the air inlet, forming a rotating airflow in the cylinder. Since the mass of the zinc powder particles is large, the centrifugal force they are subjected to during the rotation process is also large, and they will be thrown to the wall of the cylinder and fall along the wall under the action of gravity, and finally collected in the bottom hopper 422, while the gas will form an upward airflow in the center and be discharged from the exhaust port 421.

[0043] The above description is only a preferred example of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have other optimization schemes and additional functions. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Atomized regular zinc powder preparation system, characterized by: The invention comprises a melting furnace (1), an atomization system (2), a cooling system (3) and a collection system (4); the atomization system (2) comprises an atomization chamber (21), a connecting pipe (22), a nozzle (23) and an air compressor (24); the atomization chamber (21) is arranged below the melting furnace (1); the nozzle (23) is located at the top of the atomization chamber (21); the connecting pipe (22) respectively connects the nozzle (23), the melting furnace (1) and the air compressor (24); an ultrasonic device (25) is arranged above the nozzle (23); the air compressor (24) is arranged outside the atomization chamber (21); the cooling system (3) is arranged outside the atomization chamber (21); Inside the atomizing chamber (21), the cooling system (3) comprises an air cooling zone (31), a spray cooling zone (32) and a magnetic field cooling zone (33); the air cooling zone (31), the spray cooling zone (32) and the magnetic field cooling zone (33) are arranged vertically in sequence inside the atomizing chamber (21); the collecting system (4) comprises a vibrating screen (41) and a cyclone separator (42); the vibrating screen (41) is located below the atomizing chamber (1); an outlet of the vibrating screen (41) is connected to an air inlet of the cyclone separator (42); an air outlet (421) is provided at the top of the cyclone separator (42), and a hopper (422) is provided at the bottom.

2. The system for preparing atomized zinc powder with regular morphology as claimed in claim 1, characterized in that: The connecting pipeline (22) comprises a liquid pipeline (221) and a gas pipeline (222); the liquid pipeline (221) is spiral-shaped; two ends of the liquid pipeline (221) are respectively connected to the melting furnace (1) and the nozzle (23); the ultrasonic device (25) is arranged at one end of the liquid pipeline (221) close to the nozzle (23); a regulating valve (26) is arranged at the other end of the liquid pipeline (221); and the ultrasonic frequency of the ultrasonic device (25) is 20-30 kHz.

3. The system for preparing atomized zinc powder with regular morphology as claimed in claim 2, characterized in that: The two ends of the gas pipeline (222) are respectively connected to the air compressor (24) and the nozzle (23); a pressure regulating valve (241) is provided on the gas pipeline (222); and the gas pressure in the gas pipeline (222) is 0.7-0.9 MPa.

4. The system for preparing atomized zinc powder with regular morphology as claimed in claim 1, characterized in that: The atomization chamber (1) is divided into four sections, namely an atomization zone (27), an air cooling zone (31), a spray cooling zone (32) and a magnetic field cooling zone (33); the inner wall of the atomization chamber (21) is coated with a waterproof coating (28).

5. The system for preparing atomized zinc powder with regular morphology as claimed in claim 4, characterized in that: The air cooling zone (31) is provided with a plurality of air outlets (311), a fan (312) is provided inside the air outlet (311), the air outlet (312) is inclined upward by 30° to 40°, and a baffle (313) is provided above the air outlet (312).

6. The system for preparing atomized zinc powder with regular morphology as claimed in claim 4, characterized in that: The spray cooling zone (32) is provided with a nozzle array (321) and a liquid storage tank (322); the nozzle array (321) is arranged inside the atomization chamber (21), and the liquid storage tank (322) is located outside the atomization chamber (21).

7. The system for preparing atomized zinc powder with regular morphology as claimed in claim 4, characterized in that: The bottom of the magnetic field cooling zone (33) is funnel-shaped. An electromagnetic coil (331) and a water cooling system (332) are provided in the magnetic field cooling zone (33). The electromagnetic coil (331) is located inside the atomization chamber (21), and the water cooling system (332) is located outside the electromagnetic coil (331). The magnetic field strength is 0.1-1 Tesla.

8. The system for preparing atomized zinc powder with regular morphology as claimed in claim 1, characterized in that: The collection system (4) is provided with a multi-stage vibrating screen (41), the motor (41) is located below the vibrating screen (41), the vibrating screen (41) and the motor (411) are connected via a transmission belt, and the cyclone separator (42) is located on the side of the vibrating screen (41).

9. A process for preparing atomized zinc powder with regular morphology, characterized in that: The zinc powder preparation comprises the following steps: S1: Melting the zinc block: placing the cleaned zinc block into a melting furnace (1), and melting the zinc block into liquid at a temperature of 425°C to 435°C in the furnace; S2: atomizing the zinc liquid, the molten zinc liquid flows into the nozzle (23) through the liquid pipeline (221), the ultrasonic device (25) performs ultrasonic vibration on the zinc liquid, and at the same time, the air compressor (24) passes high-purity nitrogen gas into the nozzle (23) through the gas pipeline (222), and the high-pressure nitrogen gas sprays the molten zinc liquid into a mist; S3: air cooling, the atomized zinc powder enters the air cooling zone (31), the fan (312) in the atomization zone generates an upward spiral airflow with a temperature of 20°C - 25°C, and the airflow reduces the temperature of the zinc powder according to the heat exchange principle and air convection; S4: spray cooling, in the spray cooling zone (32), the nozzle array (321) sprays deionized water at a temperature of 10°C - 12°C evenly on the zinc powder in the form of tiny droplets, and the water droplets further reduce the temperature of the zinc powder; S5: After air cooling and spray cooling, the zinc powder enters the magnetic field cooling zone (33). Under the action of the magnetic field, the magnetic moments of zinc atoms tend to align along the direction of the magnetic field. At the same time, their magnetic moments interact with each other, generating a force that prevents them from getting closer. Then the zinc powder relies on natural heat exchange between itself and the surrounding air to reduce its temperature. S6: zinc powder collection. Screens of different mesh sizes are used to grade and screen the zinc powder according to the size of the particles. The fine particles not retained by the vibrating screen (41) enter the cyclone separator (42). A rotating airflow is formed in the cylinder. The zinc powder particles are relatively large in mass and are thrown toward the wall of the cylinder under the action of centrifugal force. They fall along the wall under the action of gravity and are finally collected in the hopper (422). The rotating airflow is discharged from the exhaust port (421).

10. The process for preparing atomized zinc powder with regular morphology as claimed in claim 9, characterized in that: In step S6, the vibrating screen (41) has three layers, the upper layer screen is 120-150 mesh, the middle layer is 220-250 mesh, and the lower layer is 320-350 mesh.

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