Device for producing powder through low-melting-point metal water atomization and using method

Abstract

The invention provides a device for producing powder through low-melting-point metal water atomization and a using method, and relates to the technical field of powder metallurgy. Wherein the smelting furnace adopts a magnesia-carbon refractory material sealing structure, the periphery is provided with an induction heating coil, and the bottom is connected with a buffer chamber through a flow control sliding plate; trumpet-shaped shunt pipes are uniformly distributed at the lower part of the buffer chamber, and are externally wound with resistance wires to maintain the fluidity of molten metal; the diversion pipe nozzles correspond to the high-pressure water sprayers, and the included angle of the water spraying directions is 90-180 degrees. The argon pressure in the furnace is controlled to be 0.2-0.5 MPa through a pressure regulating pipe, the temperature of molten metal monitored by a temperature thermocouple is higher than the melting point by 50-100 DEG C, a 0.2-0.5 mol / L sucrose aqueous solution is adopted as an atomizing medium, and the water spraying pressure is 0.5-1.0 MPa. By means of the shunting multi-nozzle structure and the modified atomization medium, the problems that traditional water atomization superfine powder is difficult to prepare and low in efficiency are solved, the production efficiency is improved, the proportion of powder smaller than 10 micrometers can reach 60% or above, and the method is suitable for efficient preparation of low-melting-point metal powder such as aluminum powder and copper powder.

Description

Technical Field

[0001] The present invention relates to the technical field of powder metallurgy, and more particularly, to an apparatus and method for producing low-melting-point metal powders by water atomization. Background Art

[0002] Low-melting-point metal powders (such as aluminum, copper, etc.) are widely used in fields such as conductive coatings, electromagnetic shielding materials, and polymer conductors due to their excellent electrical conductivity and ductility. In current industrial production, the atomization method has become the mainstream process due to its simple equipment and low cost. However, it has significant technical bottlenecks: traditional water atomization technology is difficult to stably prepare ultra-fine powders with a particle size less than 10 μm, and the single-nozzle design results in a generally low production efficiency of less than 30 kg / min, making it difficult to meet the large-scale demand. Although the electrolysis method and the chemical reduction method can produce ultra-fine powders, they have problems such as high energy consumption and complex processes, significantly increasing production costs.

[0003] Research shows that the viscosity difference between the atomizing medium and the molten metal is a key factor affecting powder refinement. In the prior art, the gas atomization method has increased the production efficiency to 103 kg / min through a multi-ring spray disc design. However, due to insufficient friction of the gas medium, it still cannot break through the 10-μm fineness limit. The single-channel water atomization process, although realizing the recycling of water resources, is limited by the single-nozzle structure, with low efficiency, and ordinary circulating water is difficult to effectively refine high-temperature molten metal. In addition, although the ultrasonic-assisted method can generate ultra-fine powders, it relies on high-energy-consuming equipment and is only applicable to metal sulfides, unable to produce pure metal powders.

[0004] Further analysis reveals that the existing water atomization devices lack precise control over the flow state of the molten metal, resulting in insufficient viscosity matching during the atomization process and affecting the fine powder generation rate. At the same time, the single-channel design limits the possibility of molten metal diversion and multi-nozzle collaborative operation, becoming the core factor restricting efficiency improvement.

[0005] Therefore, how to efficiently prepare ultra-fine powders (<10 μm) by optimizing the medium viscosity and multi-channel collaboration in a low-cost water atomization process has become a technical problem that urgently needs to be solved. Summary of the Invention

[0006] In view of the above-mentioned technical problems, an apparatus and method for producing low-melting-point metal powders by water atomization are provided. The present invention can enable the water atomization process to produce low-melting-point metal powders with a particle size less than 10 μm, and at the same time improve the production efficiency of the water atomization process.

[0007] To achieve the above object, the present invention provides an apparatus for producing low-melting-point metal powders by water atomization, comprising: a melting furnace, a buffer chamber, a shunt pipe, a molten metal nozzle, a high-pressure water nozzle, an argon pressure regulating system, and a temperature measuring thermocouple;

[0008] The melting furnace is made of magnesia-carbon refractory material, with a first induction heating coil arranged on the periphery, a metal liquid outflow channel arranged at the bottom, a flow control slide plate and an argon injection pipe arranged at the top;

[0009] The buffer chamber is communicated with the metal liquid outflow channel of the melting furnace, and a second induction heating coil is arranged on the periphery;

[0010] The shunt pipes are distributed in a horn shape, the number of shunt pipes is 4 - 10, the length is 20 cm - 50 cm, the inner diameter is 10 mm - 20 mm, the pipe wall thickness is 20 mm - 30 mm, they are connected to the buffer chamber, and the outer pipe walls are wound with resistance wires, and the material is high-temperature resistant nickel-chromium alloy;

[0011] The metal liquid nozzle is arranged at the lower part of the shunt pipe;

[0012] The high-pressure water spray head is arranged corresponding to the metal liquid nozzle, the included angle between the water spraying direction and the metal liquid spraying direction is 90° - 120°, and it is connected through the main water supply pipeline;

[0013] The argon pressure regulating system includes an argon injection pipe and a pressure gauge, and is used to control the pressure difference in the melting furnace to be 0.2 - 0.5 MPa;

[0014] The temperature measuring thermocouple is arranged at the top of the melting furnace and is used to monitor the temperature of the metal liquid;

[0015] The low melting point metal is a metal with a melting point less than 1200 °C.

[0016] Furthermore, the resistance wires are spirally wound along the outer wall of the shunt pipe, and the heating power is regulated in sections according to the length of the shunt pipe. The power of the resistance wires corresponding to each meter of the shunt pipe is 10 - 20 kilowatts.

[0017] Furthermore, the horn-shaped structure of the shunt pipe includes at least three branch pipes, and the end of each branch pipe is connected to a metal liquid nozzle, which is used to evenly disperse the metal liquid to multiple nozzles.

[0018] Furthermore, the first induction heating coil of the melting furnace and the induction heating coil of the second buffer chamber control the temperature of the metal liquid in stages, so that the temperature of the metal liquid in the melting furnace is 50 - 100 °C higher than the melting point, and the temperature of the metal liquid in the buffer chamber is 30 - 60 °C higher than the melting point.

[0019] The present invention also provides a method for producing low melting point metal water atomized powder, including the following steps:

[0020] S1. Load the low melting point metal to be water atomized into the melting furnace, seal it, and connect the temperature measuring thermocouple and the argon injection pipe;

[0021] S2. Start the first induction heating coil, adjust the power to 200 - 250 kW at a rate of 20 kW per minute, then stop power adjustment, and wait until the low-melting-point metal in the melting furnace is completely melted into liquid metal;

[0022] S3. When the temperature of the molten metal exceeds the melting point by 50 - 100 °C, adjust the heating power to 20 - 50 kW to keep the molten metal in the melting furnace warm;

[0023] S4. Open the flow control slide plate to allow the molten metal to flow into the buffer chamber. At the same time, start the second induction heating coil to heat the molten metal in the buffer chamber, and start the resistance wire to reheat the molten metal flowing through the shunt pipe;

[0024] S5. Inject argon into the melting furnace through the argon injection pipe to maintain the pressure in the melting furnace at 0.2 - 0.5 MPa, so that the molten metal can be stably ejected from the nozzle;

[0025] S6. Start the high-pressure water spray head with a spray pressure of 0.5 - 1.0 MPa, and use an aqueous solution containing sucrose to atomize the molten metal;

[0026] S7. Recover the dried and atomized metal powder, and screen to obtain the powder with the target particle size.

[0027] Further, the low-melting-point metal is copper or aluminum, the particle size of the powder after atomization is less than 10 μm, and the proportion of the powder with this particle size reaches more than 60%.

[0028] Further, in step S6, the sucrose molar concentration of the atomization medium water is 0.2 - 0.5 mol / L, and the water temperature is 0 - 20 °C.

[0029] Due to the adoption of the above technical solution, compared with the prior art, the present invention has the following advantages:

[0030] 1. A device for producing powder by water atomization of low-melting-point metal provided by the present invention

[0031] By using an aqueous solution containing sucrose with a molar concentration of 0.2 - 0.5 mol / L as the atomization medium, its viscosity is higher than that of ordinary water medium, effectively increasing the friction force with the high-temperature molten metal, making the molten metal more easily sheared and dispersed into ultrafine particles, and the proportion of the powder with this particle size reaches more than 60%, solving the problem that traditional water atomization is difficult to refine.

[0032] 2. A device for producing powder by water atomization of low-melting-point metal provided by the present invention, the induction coil of the melting furnace, the induction coil of the buffer chamber and the resistance wire of the shunt pipe form a stepped heating, controlling the temperature of the molten metal in stages, ensuring the stable flow of the molten metal throughout the process from melting to atomization, and avoiding pipeline blockage or atomization interruption caused by temperature fluctuations.

[0033] 3. The powder production device for low-melting-point metal by water atomization provided by the present invention has a plurality of metal liquid nozzles evenly distributed at the end of the horn-shaped shunt pipe. With the synergistic effect of the high-pressure water spray head, multi-channel synchronous atomization of the metal liquid is achieved, breaking through the upper limit of the atomization efficiency of the traditional single nozzle, and the production efficiency is increased to an industrial applicable level.

[0034] 4. The powder production device for low-melting-point metal by water atomization provided by the present invention precisely controls the flow rate of the metal liquid through the argon injection pipe, and combines the segmented regulation of the water temperature of the atomization medium, the water spray pressure and the heating power to inhibit the oxidation and volatilization of the metal liquid. At the same time, the sphericity and particle size distribution of the powder are optimized, and the generation of irregular particles is reduced.

[0035] Based on the above reasons, the present invention can be widely promoted in the field of powder metallurgy technology. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 It is a schematic structural diagram of a powder production device for low-melting-point metal by water atomization described in the present invention;

[0038] Figure 2 It is a flowchart of a method for producing powder of low-melting-point metal by water atomization described in the present invention.

[0039] In the figure: 1, melting furnace; 2, metal liquid; 3, buffer chamber; 4, shunt pipe; 5, metal liquid nozzle; 6, total water supply pipeline; 7, high-pressure water spray head; 8, metal liquid outflow channel; 9, flow control slide plate; 10, first induction heating coil; 11, pressure gauge; 12, argon injection pipe; 13, second induction heating coil; 14, resistance wire; 15, temperature measuring thermocouple. Detailed Embodiments

[0040] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only some, but not all, of the embodiments of the present invention. The description of at least one exemplary embodiment herein is in fact merely illustrative and in no way limits the present invention and its application or uses. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprises" and / or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present invention. The orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0045] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to include different orientations during use or operation in addition to the orientation described in the figure for the device. For example, if the device in the attached drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0046] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, so they cannot be understood as limitations on the protection scope of the present invention.

[0047] Example 1

[0048] As Figures 1 to 2 shown, the present invention provides a device for producing low-melting-point metal water atomization powder, including: a melting furnace 1, a buffer chamber 3, a shunt pipe 4, a metal liquid nozzle 5, a high-pressure water nozzle 7, an argon pressure regulating system, and a temperature measuring thermocouple 15;

[0049] Melting furnace 1: Made of magnesia-carbon refractory material, with an argon injection pipe 12 and a temperature measuring thermocouple 15 provided at the top, and a metal liquid outflow channel 8 connected at the bottom. The flow control slide plate 9 controls the flow rate of the metal liquid 2 by adjusting the opening degree; the power of the first induction heating coil 10 on the periphery is 50 - 300 kW, which is used to heat the metal to 50 - 100 °C above the melting point; the argon injection pipe 12 maintains the furnace pressure at 0.2 - 0.5 MPa through a pressure gauge 11 to ensure the stable flow rate of the metal liquid 2.

[0050] Buffer chamber 3: Communicates with the melting furnace 1, and the power of the second induction heating coil 13 on the periphery is 50 - 100 kW, which is used to maintain the temperature of the metal liquid 2 30 - 60 °C higher than the melting point.

[0051] Shunt pipe 4: A horn-shaped nickel-chromium alloy pipe, with a resistance wire 14 spirally wound around the outer wall, and the heating power is regulated in sections to prevent the metal liquid 2 from solidifying; at least three metal liquid nozzles 5 are evenly distributed at the end to achieve multi-channel synchronous atomization.

[0052] High-pressure water nozzle 7: Connected through the main water supply pipeline 6, the water spraying direction forms an angle of 90°-180° with the spraying direction of the molten metal nozzle 5, and the water spraying pressure is 0.5-1.0 MPa.

[0053] The atomizing medium is an aqueous solution containing sucrose, with a molar concentration of 0.2-0.5 mol / L and a water temperature of 0-20 °C, which can increase the medium viscosity to improve the shear efficiency.

[0054] The present invention also provides a method for producing low-melting-point metal water atomized powder, including the following steps:

[0055] S1. After loading the low-melting-point metal to be water atomized into the melting furnace 1, seal the melting furnace 1 and connect the temperature measuring thermocouple 15 and the argon injection pipe 12;

[0056] S2. Start the first induction heating coil 10, adjust its power at a heating rate of 20 kW per minute, stop the power adjustment after adjusting the heating power to 200-250 kW, and wait for the low-melting-point metal in the furnace to be completely melted into liquid metal;

[0057] S3. Use the temperature measuring thermocouple 15 to measure the temperature of the molten metal 2 in the melting furnace 1. When the temperature exceeds the melting point of the melted metal by 50-100 °C, adjust the power of the heating coil to 20-50 kW to keep the molten metal 2 in the melting furnace 1 at a constant temperature;

[0058] S4. Open the flow control slide plate 9 at the bottom of the melting furnace 1, put the molten metal 2 into the buffer chamber 3, and at the same time start the second induction heating coil 13 to heat the molten metal 2 in the buffer chamber 3, and start the resistance wire 14 to reheat the molten metal 2 flowing through the shunt pipe 4;

[0059] S5. Inject argon into the melting furnace 1 through the argon injection pipe 12, maintain the pressure difference at 0.2-0.5 MPa, so that the molten metal 2 can be ejected from the molten metal nozzle 5 at a stable flow rate;

[0060] S6. After the molten metal flows out of the nozzle 5, open the main pipeline and use the nozzle to perform water atomization operation on the flowing molten metal 2, control the water spraying pressure at 0.5-1.0 MPa, and at the same time adjust the sucrose molar concentration of the atomizing medium water to 0.2-0.5 mol / L;

[0061] S7. Recover and dry the water atomized metal powder, and screen it into powders of different particle sizes.

[0062] Example 2

[0063] Prepare copper powder with a particle size of 5-8 μm

[0064] Put the raw material metal copper into the melting furnace 1, seal the melting furnace 1, and connect the temperature-measuring thermocouple 15 and the argon injection pipe 12;

[0065] Start the first induction heating coil 10, adjust its power at a heating rate of 20 kilowatts per minute, stop adjusting the power after adjusting the heating power to 240 kilowatts, and wait until the metal copper in the furnace is completely melted into liquid metal copper;

[0066] Use the temperature-measuring thermocouple 15 to measure the temperature of the copper liquid in the melting furnace 1. When the temperature exceeds the melting point of the melted metal by 60 °C, adjust the power of the heating coil to 35 kilowatts to keep the copper liquid in the melting furnace 1 warm;

[0067] Open the flow control slide plate 9 at the bottom of the melting furnace 1, put the copper liquid into the buffer chamber 3, and at the same time start the second induction heating coil 13 to heat the copper liquid in the buffer chamber 3, with its heating power being 70 kilowatts, and start the resistance wire 14 to heat the copper liquid flowing through the shunt pipe 4 again, with its heating power being 50 kilowatts;

[0068] Inject argon into the melting furnace 1 through the argon injection pipe 12, maintain the pressure difference at 0.3 MPa, so that the metal liquid 2 can spray out from the metal liquid nozzle 5 at a stable flow rate;

[0069] After the copper liquid flows out of the metal liquid nozzle 5, open the main pipeline and use the nozzle to perform water atomization operation on the flowing copper liquid. Control the spraying pressure at 0.7 MPa, and adjust the sucrose molar concentration of the atomizing medium water to 0.4 mol / L;

[0070] Recover and dry the water-atomized copper powder, and use sieves of different models to screen out 5-8 μm copper powder to complete the preparation.

[0071] Example 3

[0072] Prepare aluminum powder with a particle size of 5-8 μm

[0073] Put the raw material metal aluminum into the melting furnace 1, seal the melting furnace 1, and connect the temperature-measuring thermocouple 15 and the argon injection pipe 12;

[0074] Start the first induction heating coil 10, adjust its power at a heating rate of 20 kilowatts per minute, stop adjusting the power after adjusting the heating power to 210 kilowatts, and wait until the metal aluminum in the furnace is completely melted into liquid metal aluminum;

[0075] Use the temperature-measuring thermocouple 15 to measure the temperature of the aluminum liquid in the melting furnace 1. When the temperature exceeds the melting point of the melted metal by 50 °C, adjust the power of the heating coil to 30 kilowatts to keep the aluminum liquid in the melting furnace 1 warm;

[0076] Open the flow control slide plate 9 at the bottom of the smelting furnace 1, put the molten aluminum into the buffer chamber 3, and at the same time start the second induction heating coil 13 to heat the molten aluminum in the buffer chamber 3, with a heating power of 55 kW. Start the resistance wire 14 to reheat the molten aluminum flowing through the shunt pipe 4, with a heating power of 40 kW;

[0077] Inject argon into the smelting furnace 1 through the argon injection pipe 12, maintain the pressure difference at 0.4 MPa, so that the molten aluminum can be ejected from the metal liquid nozzle 5 at a stable flow rate;

[0078] After the molten aluminum flows out of the metal liquid nozzle 5, open the main pipeline and use the nozzle to perform water atomization operation on the flowing molten aluminum. The water spraying pressure is controlled at 0.6 MPa, and the sucrose molar concentration of the atomization medium water is adjusted to 0.25 mol / L;

[0079] Recover and dry the water-atomized aluminum powder, and use sieves of different models to screen out the 5-8 μm aluminum powder to complete the preparation.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for producing powder by water atomization of low-melting-point metal, characterized in that, Including: A melting furnace, a buffer chamber, a shunt pipe, a molten metal nozzle, a high-pressure water spray head, an argon pressure regulating system, a temperature measuring thermocouple; The melting furnace is made of magnesia-carbon refractory material, with a first induction heating coil arranged on the periphery, a molten metal outflow channel arranged at the bottom, a flow control slide plate and an argon injection pipe arranged at the top; The buffer chamber is communicated with the molten metal outflow channel of the melting furnace, and a second induction heating coil is arranged on the periphery; The shunt pipe is distributed in a horn shape, with 4 to 10 shunt pipes, a length of 20 cm to 50 cm, an inner diameter of 10 mm to 20 mm, a pipe wall thickness of 20 mm to 30 mm, connected to the buffer chamber, and a resistance wire wound around the outer pipe wall, and the material is high-temperature resistant nickel-chromium alloy; The molten metal nozzle is arranged at the lower part of the shunt pipe; The high-pressure water spray head is arranged corresponding to the molten metal nozzle, and the included angle between the water spraying direction and the molten metal spraying direction is 90° - 120°, and it is connected through a total water supply pipeline; The argon pressure regulating system includes an argon injection pipe and a pressure gauge, and is used to control the pressure difference in the melting furnace to be 0.2 - 0.5 MPa; The temperature measuring thermocouple is arranged at the top of the melting furnace and is used to monitor the temperature of the molten metal; The low-melting-point metal is a metal with a melting point less than 1200 °C.

2. The device for producing metal water atomization powder with low melting point according to claim 1, characterized in that, The resistance wire is spirally wound along the outer wall of the shunt pipe, and the heating power is regulated in sections according to the length of the shunt pipe, and the power of the resistance wire corresponding to each meter of the shunt pipe is 10 - 20 kilowatts.

3. A device for producing low-melting-point metal water atomization powder according to claim 1, characterized in that, The horn-shaped structure of the shunt pipe includes at least three branch pipes, and the end of each branch pipe is connected to a molten metal nozzle, and is used to evenly disperse the molten metal to a plurality of nozzles.

4. A device for producing metal water atomized powder with low melting point according to claim 1, characterized in that, The first induction heating coil of the melting furnace and the second induction heating coil of the buffer chamber control the temperature of the molten metal in stages, so that the temperature of the molten metal in the melting furnace is 50 - 100 °C higher than the melting point, and the temperature of the molten metal in the buffer chamber is 30 - 60 °C higher than the melting point.

5. A method for producing powder by water atomization of a low-melting-point metal, using the device according to any one of claims 1-4, characterized in that, Including the following steps: S1. Load the low-melting-point metal to be water atomized into the melting furnace, seal it, and connect the temperature measuring thermocouple and the argon injection pipe; S2. Start the first induction heating coil, adjust the power to 200 - 250 kilowatts and then stop adjusting the power, and wait for the low-melting-point metal in the melting furnace to be completely melted into liquid metal; S3. When the temperature of the molten metal exceeds the melting point by 50 - 100 °C, adjust the heating power to 20 - 50 kilowatts to keep the molten metal in the melting furnace warm; S4. Open the flow control slide plate to make the molten metal flow into the buffer chamber, and at the same time start the second induction heating coil to heat the molten metal in the buffer chamber, and start the resistance wire to reheat the molten metal flowing through the shunt pipe; S5. Inject argon into the melting furnace through the argon injection pipe to maintain the pressure difference in the melting furnace at 0.2 - 0.5 MPa, so that the molten metal sprays out stably from the nozzle; S6. Start the high-pressure water spray head, with a water spraying pressure of 0.5 - 1.0 MPa, and use an aqueous solution containing sucrose to atomize the molten metal; S7. Recover the dried and atomized metal powder, and screen to obtain the powder with the target particle size.

6. A method for producing powder by water atomization of low melting point metal according to claim 6, characterized in that, The low-melting-point metal is copper or aluminum, the particle size of the atomized powder is less than 10 μm, and the proportion of the powder with this particle size reaches more than 60%.

7. A method for producing powder by water atomization of a low melting point metal according to claim 6, characterized in that, In step S6, the sucrose molar concentration of the atomizing medium water is 0.2 - 0.5 mol / L, and the water temperature is 0 - 20 °C.

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