Device and process for preparing high-dispersity corrosion-resistant zinc powder

Abstract

The high-dispersity corrosion-resistant zinc powder preparation device comprises a distillation furnace, a zinc powder preparation device body, an airflow mixer and a cyclone separator, the top end of the distillation furnace is in flange connection with one end of a first pipeline, and the other end of the first pipeline and one end of a second pipeline are in flange connection with the two ends of a first reducing pipe correspondingly; the pipe diameter of the second pipeline is smaller than that of the first pipeline, a flange at the other end of the second pipeline is connected with a zinc steam inlet cover, a plurality of first nozzles are evenly distributed on the top of the zinc powder preparation device, a third pipeline is arranged between the zinc powder preparation device and the airflow mixer, and a plurality of second nozzles are arranged on the third pipeline. And an air inlet pipe of the cyclone separator is connected with the airflow mixer. The zinc powder with fine granularity and uniform distribution can be obtained, direct contact between the zinc powder and air is avoided, oxidation and pollution of the zinc powder are reduced, and the purity and corrosion resistance of the product are improved.

Description

Technical Field

[0001] The invention relates to the field of metal smelting, and in particular to a device and process for preparing highly dispersible corrosion-resistant zinc powder. Background Art

[0002] Zinc powder is an important industrial raw material, which is widely used in metallurgy, chemical industry, construction, transportation, medicine, electronics and other fields. The production methods of zinc powder generally include atomization method and evaporation condensation method. The existing atomization method for preparing zinc powder, such as air jet atomization, has low product recovery rate, high power consumption, and uneven particles. The evaporation condensation method generally heats zinc ingots or other zinc raw materials in a zinc melting furnace until evaporation, and then condenses to produce zinc powder, but the productivity of this evaporation condensation method is still not high enough, the pollution to the environment is serious, and the zinc powder produced by the existing process has low dispersibility and poor corrosion resistance. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a highly dispersible corrosion-resistant zinc powder preparation device and process.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a highly dispersed and corrosion-resistant zinc powder preparation device, comprising a distillation furnace, a zinc powder preparation device, an air flow mixer and a cyclone separator, the top flange of the distillation furnace is connected to one end of a first pipe, the other end of the first pipe and one end of the second pipe are respectively flange-connected to two ends of a first reducer, the diameter of the second pipe is smaller than the diameter of the first pipe, the other end of the second pipe is flange-connected to a zinc steam inlet cover, a plurality of first nozzles are evenly distributed on the top of the zinc powder preparation device, a third pipe is provided between the zinc powder preparation device and the air flow mixer, a plurality of second nozzles are provided on the third pipe, and the air inlet pipe of the cyclone separator is connected to the air flow mixer.

[0005] Preferably, an air outlet pipe is provided on the top of the cyclone separator, the air outlet pipe flange is connected to one end of the second reducer, the other end of the second reducer flange is connected to one end of the inert gas return pipe, and the other end of the inert gas return pipe extends into the second through hole.

[0006] Preferably, the zinc vapor inlet cover is fixed to the outer side wall of the zinc powder preparation device, a second through hole and a third through hole are provided at the top of the side wall of the zinc powder preparation device, the aperture of the second through hole is equal to the outer diameter of the inert gas reflux pipe, the aperture of the third through hole is equal to the outer diameter of the inert gas inlet pipe, the inert gas inlet pipe extends into the third through hole, and a first through hole is provided at the bottom of the side wall of the zinc powder preparation device, the aperture of the first through hole is equal to the outer diameter of the third pipe.

[0007] Preferably, an inert gas distribution area is provided on the first nozzle, a plurality of first spray holes are provided on the first nozzle, and the bottom of the first nozzle is equal to or higher than the highest point of the zinc vapor inlet cover.

[0008] Preferably, a dispersant distribution area is provided on the second nozzle, the top of the dispersant distribution area is connected to a dispersant inlet pipe, and the second nozzle is provided with a plurality of second spray holes.

[0009] Preferably, the bottom of the cyclone separator is a zinc powder outlet, an ash hopper is provided below the zinc powder outlet, and the air inlet pipe is a circular pipe.

[0010] Preferably, the zinc powder preparation device is mounted on a bracket.

[0011] The present invention also provides a device and process for preparing highly dispersible corrosion-resistant zinc powder, comprising the following steps: S1: Put the zinc ingot into the distillation furnace to melt and form zinc vapor. The temperature of the distillation furnace is controlled at 907~950℃; S2: Leading zinc vapor to the zinc powder preparation device through a pipeline, using a first nozzle to generate high-pressure inert gas to impact the zinc vapor, so that the zinc vapor is quickly condensed into fine particles, and the fine zinc droplets are quickly cooled and solidified into solid zinc powder in the inert gas atmosphere; S3: adding a dispersant into a pipeline connecting the zinc powder preparation device and the cyclone separator; S4: uniformly mix the dispersant and zinc powder through an air flow mixer; S5: separating zinc powder from gas through a cyclone separator, and collecting the separated zinc powder in an ash hopper; S6: Use a sieve to screen the zinc powder.

[0012] Preferably, the inert gas is nitrogen, helium, argon or carbon dioxide.

[0013] Preferably, the dispersant is sodium silicate, sodium lauryl sulfate, sodium hexametaphosphate or polyethylene glycol.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention melts the zinc ingot into zinc vapor, and impurities are retained at the bottom of the distillation furnace due to their high boiling point. The flow rate of the zinc vapor is gradually accelerated through the contraction pipe section, and the collision and interaction between the zinc vapor molecules are enhanced. The zinc vapor enters the zinc powder preparation device, and high-pressure inert gas is sprayed through the first nozzle to rapidly condense the zinc vapor into fine particles. A dispersant is added through the nozzle, and then the zinc vapor enters the air flow mixer for uniform mixing. The zinc powder is then collected through a cyclone separator to obtain zinc powder with fine particle size and uniform distribution, and direct contact between the zinc powder and the air is avoided, oxidation and pollution of the zinc powder are reduced, and the purity and corrosion resistance of the product are improved. The zinc vapor enters horizontally and the inert gas is sprayed vertically or obliquely, which can generate stronger shear force and turbulence effect, which is helpful to condense the zinc vapor. The zinc powder is dispersed more evenly into tiny droplets, and the zinc vapor enters horizontally, so that the flow direction of the zinc vapor is consistent with the axis of the first nozzle, which helps to maintain the stability and uniformity of the atomization; a dispersant is added to the pipeline connecting the zinc powder preparation device and the cyclone separator, and the particles are prevented from agglomerating by charge repulsion, forming a protective film or forming a steric hindrance, thereby improving the dispersibility of the zinc powder. At the same time, the particle refinement and purity improvement of the zinc powder also improve the corrosion resistance to a certain extent. The dispersant can be evenly sprayed using a nozzle, and the airflow mixer mixes the dispersant and the zinc powder evenly; the present invention reduces the introduction of water and oxygen and the generation of waste residue and wastewater, is more environmentally friendly and energy-saving, and the inert gas reflux pipe returns the inert gas separated by the cyclone separator to the inert gas distribution area for recycling and cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a structural block diagram of the device and process for preparing highly dispersible corrosion-resistant zinc powder.

[0016] Figure 2 It is a structural schematic diagram of the highly dispersible corrosion-resistant zinc powder preparation device and process of the present invention.

[0017] Figure 3 It is a left view of the zinc powder preparation device of the highly dispersible corrosion-resistant zinc powder preparation device and process of the present invention.

[0018] Figure 4 It is a left view of a cyclone separator of the device and process for preparing highly dispersible corrosion-resistant zinc powder of the present invention.

[0019] Description of the drawings: 1. Distillation furnace, 11. First pipeline, 12. First reducer, 13. Second pipeline, 2. Zinc powder preparation device, 21. Bracket, 22. Zinc vapor inlet cover, 23. Inert gas distribution area, 24. First nozzle, 25. First spray hole, 26. First through hole, 27. Second through hole, 28. Inert gas inlet pipe, 29. Third through hole, 3. Cyclone separator, 31. Air inlet pipe, 32. Air outlet pipe, 33. Zinc powder outlet, 34. Ash hopper, 35. Second reducer, 36. Inert gas reflux pipe, 4. Air flow mixer, 41. Third pipeline, 42. Dispersant inlet pipe, 43. Second nozzle, 44. First spray hole, 45. Dispersant distribution area. DETAILED DESCRIPTION

[0020] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0021] Please refer to Figure 1 and Figure 2 The present invention provides a highly dispersible and corrosion-resistant zinc powder preparation device, comprising a distillation furnace 1, a zinc powder preparation device 2, an air flow mixer 4 and a cyclone separator 3, wherein the top of the distillation furnace 1 is flange-connected to one end of a first pipe 11, the other end of the first pipe 11 and one end of a second pipe 13 are flange-connected to two ends of a first reducer 12, the diameter of the second pipe 13 is smaller than the diameter of the first pipe 11, the other end of the second pipe 13 is flange-connected to a zinc steam inlet cover 22, a plurality of first nozzles 24 are evenly distributed on the top of the zinc powder preparation device 2, a third pipe 41 is provided between the zinc powder preparation device 2 and the air flow mixer 4, a plurality of second nozzles 42 are provided on the third pipe 41, and an air inlet pipe 31 of the cyclone separator 3 is connected to the air flow mixer 4.

[0022] In one embodiment, if Figure 2 and Figure 4 As shown, an air outlet pipe 32 is provided on the top of the cyclone separator 3, and the air outlet pipe 32 is flange-connected to one end of a second reducer 35, and the other end of the second reducer 35 is flange-connected to one end of an inert gas return pipe 36, and the other end of the inert gas return pipe 36 extends into the second through hole 27. The inert gas return pipe 36 returns the inert gas separated by the cyclone separator 3 to the inert gas distribution area 23 for recycling, thereby reducing costs and forming a closed space, thereby avoiding direct contact between zinc powder and air and reducing oxidation and pollution of zinc powder.

[0023] In one embodiment, if Figure 2 and Figure 3As shown, the zinc vapor inlet cover 22 is fixed on the outer side wall of the zinc powder preparation device 2, and a second through hole 27 and a third through hole 29 are provided on the top of the side wall of the zinc powder preparation device 2. The aperture of the second through hole 27 is equal to the outer diameter of the inert gas reflux pipe 36, and the aperture of the third through hole 29 is equal to the outer diameter of the inert gas inlet pipe 28. The inert gas inlet pipe 28 extends into the third through hole 29. A first through hole 26 is provided on the bottom of the side wall of the zinc powder preparation device 2, and the aperture of the first through hole 26 is equal to the outer diameter of the third pipe 41, so that the pipe and the zinc powder preparation device 2 can be used together to form a closed space to prevent the inert gas from overflowing.

[0024] In one embodiment, if Figure 2 As shown, the first nozzle 24 is provided with an inert gas distribution area 23, the first nozzle 24 is provided with a plurality of first spray holes 25, and the bottom of the first nozzle 24 is equal to or higher than the highest point of the zinc vapor inlet cover 22, so that the inert gas can be sprayed out evenly.

[0025] In one embodiment, if Figure 2 As shown, the second nozzle 43 is provided with a dispersant distribution area 45, the top of the dispersant distribution area 45 is connected to the dispersant inlet pipe 42, and the second nozzle 43 is provided with a plurality of second spray holes 44, so that the dispersant can be sprayed out evenly.

[0026] In one embodiment, if Figure 2 and Figure 4 As shown, the bottom of the cyclone separator 3 is a zinc powder outlet 33, and a ash hopper 34 is provided below the zinc powder outlet 33 for collecting the separated zinc powder. The air inlet pipe 31 is a circular tube. The air inlet pipe 31 is a circular tube so that the airflow is more uniform when entering, and the movement trajectory of the particles inside the cyclone separator 3 is more stable.

[0027] In one embodiment, if Figure 2 and Figure 3 As shown, the zinc powder preparation device 2 is mounted on a bracket 21. The zinc powder preparation device 2 is mounted at a higher position, and the bracket 21 plays a fixed supporting role.

[0028] In one embodiment, if Figure 1 and Figure 2 As shown, the process of preparing zinc powder specifically includes the following steps: S1: Put the zinc ingot into the distillation furnace 1 to melt and form zinc vapor, and the temperature of the distillation furnace is controlled at 907~950℃; S2: Leading zinc vapor to the zinc powder preparation device 2 through a pipeline, using the first nozzle 24 to generate high-pressure inert gas to impact the zinc vapor, so that the zinc vapor is quickly condensed into fine particles, and the fine zinc droplets are quickly cooled and solidified into solid zinc powder in the inert gas atmosphere; S3: adding a dispersant into the pipeline connecting the zinc powder preparation device 2 and the cyclone separator 3; S4: uniformly mixing the dispersant and the zinc powder through the air flow mixer 4; S5: separating zinc powder from the gas through the cyclone separator 3, and collecting the separated zinc powder in the ash hopper 34; S6: Use a sieve to screen the zinc powder.

[0029] In one embodiment, the inert gas is nitrogen, helium, argon or carbon dioxide.

[0030] In one embodiment, the dispersant is sodium silicate, sodium lauryl sulfate, sodium hexametaphosphate or polyethylene glycol.

[0031] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A device for preparing highly dispersible corrosion-resistant zinc powder, characterized in that: The invention comprises a distillation furnace (1), a zinc powder preparation device (2), an air flow mixer (4) and a cyclone separator (3), wherein the top end of the distillation furnace (1) is flange-connected to one end of a first pipe (11), the other end of the first pipe (11) and one end of a second pipe (13) are flange-connected to two ends of a first reducer (12), the diameter of the second pipe (13) is smaller than the diameter of the first pipe (11), the other end of the second pipe (13) is flange-connected to a zinc steam inlet cover (22), a plurality of first nozzles (24) are evenly distributed on the top of the zinc powder preparation device (2), a third pipe (41) is provided between the zinc powder preparation device (2) and the air flow mixer (4), a plurality of second nozzles (42) are provided on the third pipe (41), and an air inlet pipe (31) of the cyclone separator (3) is connected to the air flow mixer (4).

2. The device for preparing highly dispersible corrosion-resistant zinc powder according to claim 1, characterized in that: An air outlet pipe (32) is provided at the top of the cyclone separator (3); the air outlet pipe (32) is flange-connected to one end of a second reducer (35); the other end of the second reducer (35) is flange-connected to one end of an inert gas return pipe (36); the other end of the inert gas return pipe (36) extends into the second through hole (27).

3. The device for preparing highly dispersible corrosion-resistant zinc powder according to claim 1, characterized in that: The zinc vapor inlet cover (22) is fixed to the outer side wall of the zinc powder preparation device (2); a second through hole (27) and a third through hole (29) are provided at the top of the side wall of the zinc powder preparation device (2); the aperture of the second through hole (27) is equal to the outer diameter of the inert gas return pipe (36); the aperture of the third through hole (29) is equal to the outer diameter of the inert gas inlet pipe (28); the inert gas inlet pipe (28) extends into the third through hole (29); a first through hole (26) is provided at the bottom of the side wall of the zinc powder preparation device (2); the aperture of the first through hole (26) is equal to the outer diameter of the third pipe (41).

4. The device for preparing highly dispersible corrosion-resistant zinc powder according to claim 1, characterized in that: An inert gas distribution area (23) is provided on the first nozzle (24), a plurality of first spray holes (25) are provided on the first nozzle (24), and the bottom of the first nozzle (24) is equal to or higher than the highest point of the zinc vapor inlet cover (22).

5. The device for preparing highly dispersible corrosion-resistant zinc powder according to claim 1, characterized in that: The second nozzle (43) is provided with a dispersant distribution area (45), the top of the dispersant distribution area (45) is connected to the dispersant inlet pipe (42), and the second nozzle (43) is provided with a plurality of second spray holes (44).

6. The device for preparing highly dispersible corrosion-resistant zinc powder according to claim 1, characterized in that: The bottom of the cyclone separator (3) is a zinc powder outlet (33), an ash hopper (34) is provided below the zinc powder outlet (33), and the air inlet pipe (31) is a circular pipe.

7. The device for preparing highly dispersible corrosion-resistant zinc powder according to claim 1, characterized in that: The zinc powder preparation device (2) is mounted on a bracket (21).

8. The process for preparing highly dispersible corrosion-resistant zinc powder according to claims 1-7, characterized in that The steps include: S1: putting a zinc ingot into a distillation furnace (1) to melt and form zinc vapor, and the temperature of the distillation furnace is controlled at 907-950°C; S2: Leading the zinc vapor to the zinc powder preparation device (2) through a pipeline, using a first nozzle (24) to generate a high-pressure inert gas to impact the zinc vapor, so that the zinc vapor is rapidly condensed into fine particles, and the fine zinc droplets are rapidly cooled and solidified into solid zinc powder in the inert gas atmosphere; S3: adding a dispersant into a pipeline connecting the zinc powder preparation device (2) and the cyclone separator (3); S4: uniformly mixing the dispersant and the zinc powder through an air flow mixer (4); S5: separating zinc powder from the gas through a cyclone separator (3), and collecting the separated zinc powder in an ash hopper (34); S6: Use a sieve to screen the zinc powder.

9. The process for preparing highly dispersible corrosion-resistant zinc powder according to claim 8, characterized in that: The inert gas is nitrogen, helium, argon or carbon dioxide.

10. The process for preparing highly dispersible corrosion-resistant zinc powder according to claim 8, characterized in that: The dispersant is sodium silicate, sodium lauryl sulfate, sodium hexametaphosphate or polyethylene glycol.

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