CN110834090A - Metal powder shaping, refining and purifying device and method - Google Patents

Abstract

A metal powder shaping, refining and purifying device and method relate to a powder shaping, refining and purifying device and method. It is to solve the technical problems of low sphericity and poor purity in the existing metal powder manufacturing method. The device includes plasma generator, powder feeder, metal powder cleaning chamber, collector, heat exchanger, exhaust gas circulation filter, gas oxygen and nitrogen purifier, r gas compressor, gas storage device, vacuum pumping device and powder The automatic scraper; the plasma generator and the powder feeder are installed on the top of the clean room device; the lower air outlet pipe of the clean room device is connected to the gas storage device through the heat exchanger, the circulating filter, the oxygen and nitrogen purifier and the compressor in sequence. Method: The whole system is evacuated and filled with argon gas, and then the plasma generator is turned on to generate a plasma torch, which is sent to the metal powder for treatment, and the argon gas is purified and circulated. After treatment, the powder sphericity is ≥90%, the oxygen content is ≤980ppm, and the impurity removal rate is ≥90%. It is used in the field of powder metallurgy.

Description

A kind of metal powder shaping refinement and purification device and method

technical field

The invention relates to powder shaping, refining and purification equipment and method, belonging to the technical field of powder metallurgy industry.

Background technique

Metal powder refers to a group of metal particles with a size of less than 1 mm, including single metal powder, alloy powder and some refractory compound powder with metallic properties, and is the main raw material for powder metallurgy. The preparation methods of metal powder mainly include mechanical grinding and crushing method, atomization method, etc.

The mechanical crushing method mainly crushes solid metal into powder by crushing, crushing and grinding. This method has low efficiency, high energy consumption, irregular sharp corners of powder particles, which reduces powder fluidity, bulk density and tap density. Purity and comprehensive properties of the subsequently prepared metal components.

The atomization method refers to the process of heating a large solid metal into a molten metal and atomizing it into fine droplets through the cooling medium liquid metal, and solidifying it into powder in the cooling medium. There are mainly two kinds of gas atomization method and liquid atomization method. There are also centrifugal atomization methods that utilize rotating disk pulverization and the rotation of the melt itself (consumable electrodes and crucibles), as well as other atomization methods such as dissolved hydrogen vacuum atomization, ultrasonic atomization, and the like. Gas atomized powder is generally nearly spherical, and water atomization can produce irregular shapes. However, the equipment used in this method is expensive, and the energy consumption is high. At the same time, impurities are easily generated or mixed in the product, which affects the purity of the powder and the comprehensive performance of the subsequently prepared metal components.

SUMMARY OF THE INVENTION

The invention aims to solve the technical problems of low sphericity and poor purity of the existing metal powder preparation method, and provides a metal powder shaping, refining and purifying device and method.

The metal powder shaping, refining and purification device of the present invention includes a plasma generator 1, a powder feeder 2, a metal powder cleaning chamber 3, a first metal powder collector 4, a first heat exchanger 5, and a tail gas circulating filter 6 , the second metal powder collector 7, the gas oxygen and nitrogen purifier 8, the second heat exchanger 9, the gas compressor 10, the gas storage device 11, the vacuum device 12 and the powder automatic scraper 13;

The top of the metal powder cleaning chamber device 3 is installed with a plasma generator 1 and a powder feeder 2, and a first metal powder collector 4 is installed at the bottom; an automatic powder scraper 13 is installed inside the metal powder cleaning chamber device 3;

A second metal powder collector 7 is installed at the bottom of the exhaust gas circulation filter 6; a flame retardant filter bag is arranged in the exhaust gas circulation filter 6 for filtering dust;

An absorption layer is arranged inside the gas oxygen and nitrogen purifier 8, and the absorption layer is composed of a copper powder layer, an alkali asbestos layer, a magnesium perchlorate layer and an alkali asbestos layer from bottom to top, and is used to remove water vapor and oxygen;

The gas outlet of the gas storage device 11 is respectively connected with the plasma generator 1 and the powder feeder 2; the gas outlet pipe of the lower part of the metal powder cleaning chamber device 3 passes through the first heat exchanger 5, the exhaust gas circulation filter 6, the gas oxygen and nitrogen in sequence. The purifier 8, the second heat exchanger 9, and the gas compressor 10 are connected to the air inlet of the gas storage device 11;

The vacuuming device 12 is communicated with the metal powder purifying chamber device 3 , the exhaust gas circulating filter 6 and the gas oxygen and nitrogen purifier 8 respectively.

Further, the powder feeder 2 is a double-channel piston feeder or a disc feeder; the metal powder that needs to be shaped, refined and purified can be continuously and uninterruptedly passed through the feeder into the metal powder purification chamber. 3;

Further, the outer wall of the metal powder purifying chamber device 3 is provided with a jacket, and the bottom of the jacket is provided with a water inlet 3-1; the upper part is provided with a water outlet 3-2; 3-1 flows in and flows out from the top outlet 3-2.

Further, the outer wall of the shell of the exhaust gas circulating filter 6 is provided with a jacket, the bottom of the jacket is provided with a water inlet, and the upper portion is provided with a water outlet; the jacket is a cooling circulating waterway, and the cooling water flows in from the bottom and flows out from the top.

Further, the outer wall of the gas oxygen and nitrogen purifier 8 is provided with a jacket, and the bottom of the jacket is provided with a water inlet; the upper part is provided with a water outlet; the jacket is a cooling circulating waterway, and the cooling water flows in from the bottom and flows out from the top.

Furthermore, the gas in the gas storage device 11 is high-purity argon.

Further, the powder automatic scraper 13 consists of an annular scraper 13-1, a driving device 13-2 and a vertical rod 13-3. The annular scraper 13-1 is fixed at the bottom of the vertical rod 13-3 and the upper part of the vertical rod 13-3. Connected with the driving device 13-2; the driving device 13-2 drives the vertical rod 13-3 to move up and down, so that the annular scraper 13-1 scrapes off the powder deposited on the inner wall of the purification chamber.

Further, the metal powder shaping, refining and purifying device of the present invention also includes a detection and automatic controller 14, which displays the power, current, voltage, vacuum degree, gas flow, gas pressure, gas oxygen content and Dew point, cooling circulating water temperature and/or flow; with real-time online monitoring and adjustment of equipment operating parameters.

Further, an observation window 15 is also provided on the metal powder cleaning chamber device 3; a gas pipe is provided at the observation window 15 and is connected to the gas storage device 11, and the gas pipe is ventilated to blow off the powder deposited on the observation window 15, which is convenient for observation.

Further, the lower part of the metal powder cleaning chamber device 3 is also provided with an air inlet pipe to be connected to the gas storage device 11; it is used to directly input the gas in the gas storage device 11 to the metal powder cleaning chamber device 3 and the exhaust gas circulating filter 6. The entire system is filled with gas in the gas oxygen and nitrogen purifier 8, and gas circulation can also be performed, and purification is performed by the gas oxygen and nitrogen purifier 8 to improve the purity of the gas in the gas storage device 11.

Further, the plasma generator 1 is a DC arc plasma generator.

Furthermore, both the first metal powder collector 4 and the second metal powder collector 7 are provided with sealing valves, which can ensure that they are still sealed when they are separated from the equipment.

Furthermore, the metal powder purification chamber device 3 is also provided with an aeration head, and the aeration head is connected to the gas storage device 11; Blowing gas in the purifier 3 can reduce the falling speed of the metal powder and increase the cooling speed of the liquid metal, thereby improving the sphericity; the upper surface is curved to prevent powder accumulation.

Utilize the above-mentioned device to carry out the method of metal powder shaping refinement and purification, carry out according to the following steps:

1. Load the metal powder to be processed into the powder feeder 2;

2. Start the vacuuming device 12, pump the vacuum degree of the metal powder cleaning chamber device 3, the exhaust gas circulating filter 6 and the gas oxygen and nitrogen purifier 8 to more than 1×10 ⁻³ Pa, and close the vacuuming device 12;

3. Fill the metal powder purification chamber 3, the exhaust gas circulation filter 6 and the gas oxygen and nitrogen purifier 8 with high-purity argon through the gas storage device 11 to make the pressure reach 0.2Pa~0.5Pa; open the plasma generator 1 , adjust the voltage of the plasma generator 1 to be 90-120V and the current to be 150-300A; adjust the flow rate of the argon gas flowing into the plasma generator 1 to be 1.5-2.0L/h to generate a plasma torch;

4. Turn on the powder feeder 2, adjust the argon flow into the powder feeder 3 so that the powder feeding speed of the powder feeder 3 reaches 0.5-1kg/h, and send the metal powder into the metal powder purification chamber 3; After being processed by the high-temperature plasma torch generated by the plasma generator 1, it falls into the first metal powder collector 4; at the same time, the argon gas used for generating the plasma torch and the argon gas used for conveying the raw material powder pass through the metal powder purification chamber The air outlet at the bottom of the device 3 enters the exhaust gas circulation filter 6 through the first heat exchanger 5, the filtered metal powder falls into the second metal powder collector 7 for collection, and the argon gas enters the gas oxygen and nitrogen purifier 8 for removal. The impurities are then cooled by the second heat exchanger 9 and compressed by the gas compressor 10, and then returned to the gas storage device 11; the spherical powder in the first metal powder collector 4 is the product.

Further, the particle size of the metal powder in step 1 is 75-100 μm.

Further, the metal powder in step 1 is iron powder, stainless steel powder, non-ferrous metal powder or special metal powder;

Further, the non-ferrous metal powder is copper powder, lead powder, zinc powder, manganese powder, chromium powder, titanium powder, aluminum powder, magnesium powder, tungsten powder or molybdenum powder;

Further, the special metal powder is superalloy powder or cemented carbide powder.

The device of the invention uses a plasma torch to shape and refine the metal powder, eliminates irregular sharp corners on the surface, makes the particle size distribution more uniform, and further improves the fluidity of the powder. It can also reduce the oxygen content of metal powder and other non-metallic inclusions, and improve the purity. Compared with the original powder, the metal powder treated by the invented device has the irregular sharp corners on the powder surface disappear, and the sphericity can reach more than 90%; meanwhile, the oxygen content of the powder can be reduced to less than 980ppm, and the impurity removal rate can reach more than 90%.

The device and method of the present invention can be used for processing metal powder, and the process is simple and the efficiency is high.

Description of drawings

Fig. 1 is the structural representation of the device of the present invention;

FIG. 2 is a schematic structural diagram of the metal powder cleaning chamber device 3 and the powder automatic scraper 13 therein;

In the figure, 1 is the plasma generator, 2 is the powder feeder, 3 is the metal powder cleaning chamber, 4 is the first metal powder collector 4, 5 is the first heat exchanger, 6 is the exhaust gas circulation filter, 7 is the second metal powder collector, 8 is the gas oxygen and nitrogen purifier, 9 is the second heat exchanger, 10 is the gas compressor, 11 is the gas storage device, 12 is the vacuuming device, 13 is the powder automatic scraper, 14 is the detection and automatic controller, and 15 is the observation window;

In the powder automatic scraper 13, 13-1 is an annular scraper, 13-2 is a driving device, and 13-3 is a vertical rod 13-3.

Detailed ways

Verify the beneficial effects of the present invention with the following examples:

Embodiment 1: The metal powder shaping, refining and purification device of this embodiment consists of a DC arc plasma generator 1, a powder feeder 2, a metal powder cleaning chamber 3, a first metal powder collector 4, and a first heat exchanger 5. Tail gas circulation filter 6, second metal powder collector 7, gas oxygen and nitrogen purifier 8, second heat exchanger 9, gas compressor 10, gas storage device 11, vacuum device 12, powder automatic scraper 13 and detection and automatic controller 14; wherein the metal powder cleaning chamber device 3 is installed with a DC arc plasma generator 1 and a powder feeder 2 at the top, and a first metal powder collector 4 is installed at the bottom; the metal powder cleaning chamber device 3 A gas aeration head 13 and an automatic powder scraper 13 are installed inside; a second metal powder collector 7 is installed at the bottom of the exhaust gas circulation filter 6; a flame retardant filter bag is installed in the exhaust gas circulation filter 6 to filter dust; The inside of the oxygen and nitrogen purifier 8 is provided with an absorption layer, which is composed of copper powder layer, alkali asbestos layer, magnesium perchlorate layer and alkali asbestos layer from bottom to top, which is used to remove water vapor and oxygen; The gas outlet is respectively connected with the plasma generator 1 and the powder feeder 2; the gas outlet pipe of the lower part of the metal powder cleaning chamber device 3 passes through the first heat exchanger 5, the exhaust gas circulation filter 6, the gas oxygen and nitrogen purifier 8, the first The second heat exchanger 9 and the gas compressor 10 are connected with the air inlet of the gas storage device 11; the vacuum pumping device 12 is respectively connected with the metal powder purifier 3, the exhaust gas circulating filter 6 and the gas oxygen and nitrogen purifier 8; The powder machine 2 is a double-channel piston feeder; the outer wall of the metal powder cleaning chamber 3 is provided with a jacket; the jacket is a cooling circulating water circuit, and the cooling water flows in from the bottom water inlet 3-1, and the top water outlet 3 -2 outflow; the outer wall of the shell of the exhaust gas circulating filter 6 is provided with a jacket; the jacket is a cooling circulating waterway, and the cooling water flows in from the bottom and flows out from the top; the outer wall of the shell of the gas oxygen and nitrogen purifier 8 is provided with a jacket; The jacket is a cooling circulating water circuit, the cooling water flows in from the bottom and flows out from the top; the gas in the gas storage device 11 is high-purity argon with a mass percent purity of 99.999%; the powder automatic scraper 13 is composed of an annular scraper 13-1 , the driving device 13-2 and the vertical rod 13-3, the annular scraper 13-1 is fixed on the bottom of the vertical rod 13-3, the upper part of the vertical rod 13-3 is connected with the driving device 13-2; the driving device 13-2 drives the vertical rod 13-3 moves up and down, so that the annular scraper 13-1 scrapes off the powder deposited on the wall of the purification chamber; an observation window 15 is also set on the wall of the metal powder purification chamber 3; The gas storage device 11 is connected, and the trachea is ventilated to blow off the powder deposited on the observation window 15, which is convenient for observation; the detection and automatic controller 14 displays the power, current, voltage, vacuum degree, gas flow, and gas under the working state of the equipment. Pressure, gas oxygen content and dew point, cooling circulating water temperature and flow; it has the function of real-time online monitoring and adjustment of equipment operating parameters; the first metal powder collector 4 and the second metal powder collector 7 are equipped with sealing valves, which can Make sure they remain sealed when separated from the device.

The method for processing titanium alloy powder using the device of this embodiment 1 is carried out according to the following steps:

1. Load 1kg of titanium alloy TA1 powder with an average particle size of 75 μm and an irregular shape into the powder feeder 2;

2. Start the vacuum pumping device 12, pump the vacuum degree of the metal powder purification chamber device 3, the exhaust gas circulation filter 6 and the gas oxygen and nitrogen purifier 8 to 1×10 ⁻³ Pa, and close the vacuum pumping device 12;

3. Fill the metal powder purification chamber 3, the exhaust gas circulation filter 6 and the gas oxygen and nitrogen purifier 8 with high-purity argon through the gas storage device 11 to make the pressure reach 0.2Pa; open the plasma generator 1, adjust the plasma The voltage of the body generator 1 is 90V and the current is 150A; the flow rate of argon gas flowing into the plasma generator 1 is adjusted to be 1.5L/h to generate a plasma torch;

4. Turn on the powder feeder 2, adjust the argon flow rate into the powder feeder 2 to 0.6L/h so that the powder feeding speed of the powder feeder 2 reaches 0.5kg/h, and send the TA1 powder into the metal powder purification chamber 3 Medium; TA1 powder is heated and melted in the high-temperature plasma torch generated by plasma generator 1, the irregular sharp corners on the surface disappear, and spherical molten droplets are formed due to surface tension, and continue to descend and cool under the action of gravity, reaching the purification of metal powder At the bottom of the chamber device 3, spherical powder is formed and falls into the first metal powder collector 4; at the same time, the argon gas used to generate the plasma torch and the argon gas used to transport the raw material powder pass through the gas outlet at the bottom of the metal powder purification chamber device 3. The first heat exchanger 5 enters the exhaust gas circulation filter 6, and the fine metal powder after filtering falls into the second metal powder collector 7 for collection, and the argon gas enters the gas oxygen and nitrogen purifier 8 to remove the impurity gas, and then passes The second heat exchanger 9 is cooled, compressed by the gas compressor 10, and returned to the gas storage device 11; the spherical TA1 powder in the first metal powder collector 4 is the product.

Compared with the original powder, the TA1 powder product of this embodiment has the disappearance of irregular sharp corners on the powder surface, and the sphericity reaches 90%; the average particle size is 30 μm, and the refinement rate reaches 50%; at the same time, the oxygen content of the TA1 powder is determined by the original powder. 10000ppm is reduced to 980ppm, and the impurity removal rate reaches 90%.

Embodiment 2: The difference between the metal powder shaping, refining and purification device of this embodiment is that the metal powder purification chamber device 3 is also provided with an aeration head, which is connected to the gas storage device 11; the aeration head is The upper surface is arc-shaped, and the upper surface is provided with an air outlet, and argon gas is blown into the metal powder purification chamber device 3 through the air outlet. Others are the same as in Example 1.

Utilize the method of the device of this embodiment 2 to process titanium alloy powder, carry out according to the following steps:

1. Load 1kg of titanium alloy TA1 powder with an average particle size of 75 μm and an irregular shape into the powder feeder 2;

2. Start the vacuum pumping device 12, pump the vacuum degree of the metal powder cleaning chamber device 3, the exhaust gas circulating filter 6 and the gas oxygen and nitrogen purifier 8 to 9×10 ⁻⁴ Pa, and close the vacuum pumping device 12;

3. Fill the metal powder purification chamber 3, the exhaust gas circulation filter 6 and the gas oxygen and nitrogen purifier 8 with high-purity argon through the gas storage device 11 to make the pressure reach 0.3Pa; open the plasma generator 1, adjust the plasma The voltage of the body generator 1 is 110V and the current is 200A; the flow rate of the argon gas flowing into the plasma generator 1 is adjusted to be 1.5L/h to generate a plasma torch;

4. Turn on the powder feeder 2, adjust the argon flow rate into the powder feeder 2 to 0.6L/h so that the powder feeding speed of the powder feeder 2 reaches 0.5kg/h, and send the TA1 powder into the metal powder purification chamber 3 At the same time, argon gas is introduced into the metal powder purification chamber device 3 through the aeration head; the TA1 powder is heated and melted in the high-temperature plasma torch generated by the plasma generator 1, and the irregular sharp corners on the surface disappear, which are formed due to surface tension. The spherical molten droplets continuously descend and cool under the action of gravity, and reach the bottom of the metal powder purification chamber 3 to form spherical powders and fall into the first metal powder collector 4; Argon for generating plasma torches and for conveying The argon gas of the raw material powder enters the exhaust gas circulation filter 6 through the air outlet at the bottom of the metal powder purification chamber device 3 through the first heat exchanger 5, and the filtered fine metal powder falls into the second metal powder collector 7 for collection. , the argon gas re-enters the gas oxygen and nitrogen purifier 8 to remove impurity gas, is cooled by the second heat exchanger 9, compressed by the gas compressor 10, and returned to the gas storage device 11; the spherical shape in the first metal powder collector 4 TA1 powder is the product.

In the aeration head of this embodiment, the argon gas blown into the metal powder purification chamber device 3 from the air outlet of the aeration head can improve the cooling speed of the liquid metal, reduce the deformation of the molten droplets during the descending process, and improve the Sphericality; the upper surface is curved to prevent powder accumulation. Compared with the original powder, the TA1 powder product of this embodiment has the disappearance of irregular sharp corners on the powder surface, and the sphericity reaches 95%; the average particle size is 30 μm, and the refinement rate reaches 52%; at the same time, the oxygen content of the TA1 powder is determined by the original powder. 10000ppm was reduced to 965ppm, and the impurity removal rate reached 93%.

Claims (10)

1. A metal powder shaping refinement and purification device, characterized in that the device comprises a plasma generator (1), a powder feeder (2), a metal powder purification chamber device (3), a first metal powder collector ( 4), the first heat exchanger (5), the exhaust gas circulation filter (6), the second metal powder collector (7), the gas oxygen and nitrogen purifier (8), the second heat exchanger (9), the gas compression machine (10), gas storage device (11), vacuuming device (12), powder automatic scraper (13); Wherein the metal powder purification chamber device (3) is installed with a plasma generator (1) and a powder feeder (2) at the top, and a first metal powder collector (4) is installed at the bottom; the metal powder purification chamber device (3) is internally installed Powder automatic scraper (13); A second metal powder collector (7) is installed at the bottom of the exhaust gas circulation filter (6); a flame retardant filter bag is arranged in the exhaust gas circulation filter (6); An absorption layer is arranged inside the gas oxygen and nitrogen purifier (8), and the absorption layer is composed of a copper powder layer, an alkali asbestos layer, a magnesium perchlorate layer and an alkali asbestos layer from bottom to top; The gas outlet of the gas storage device (11) is respectively connected with the plasma generator (1) and the powder feeder (2); the gas outlet pipe of the lower part of the metal powder cleaning chamber device (3) passes through the first heat exchanger (5) in sequence , the exhaust gas circulation filter (6), the gas oxygen and nitrogen purifier (8), the second heat exchanger (9), the gas compressor (10) are connected to the gas inlet of the gas storage device (11); The vacuuming device (12) is respectively communicated with the metal powder purification chamber device (3), the exhaust gas circulation filter (6) and the gas oxygen and nitrogen purifier (8). 2. A metal powder shaping, refining and purifying device according to claim 1, characterized in that the powder feeder (2) is a dual-channel piston feeder or a disc feeder. 3. A metal powder shaping, refining and purifying device according to claim 1 or 2, characterized in that the outer wall of the shell of the metal powder purifying chamber device (3) is provided with a jacket; the bottom of the jacket is provided with a water inlet (3 -1); water outlet (3-2) is arranged on the upper part. 4. A metal powder shaping, refining and purifying device according to claim 1 or 2, characterized in that the powder automatic scraper (13) consists of an annular scraper (13-1), a driving device (13-2) and a The vertical rod (13-3) and the annular scraper (13-1) are fixed on the bottom of the vertical rod (13-3), and the upper part of the vertical rod (13-3) is connected with the driving device (13-2). 5. A metal powder shaping, refining and purifying device according to claim 1 or 2, characterized in that an observation window 15 is also arranged on the metal powder cleaning chamber device (3); The device (11) is connected. 6. A metal powder shaping, refining and purifying device according to claim 1 or 2, characterized in that the lower part of the metal powder purifying chamber device (3) is further provided with an air inlet pipe to be connected with the gas storage device (11). 7. A metal powder shaping, refining and purifying device according to claim 1 or 2, characterized in that the metal powder cleaning chamber device (3) is also provided with an aeration head, the aeration head and the gas storage device (11) ) connection; the upper surface of the aeration head is arc-shaped, and the upper surface is provided with an air outlet. 8. A metal powder shaping, refining and purifying device according to claim 1 or 2, characterized in that the device further comprises a detection and automatic controller (14), which displays the power, current, and voltage of the device in working state , vacuum, gas flow, gas pressure, gas oxygen content and dew point, one or more parameters of cooling circulating water temperature and flow. 9. utilize the device of claim 1 to carry out the method for metal powder shaping refinement and purification, it is characterized in that this method is carried out according to the following steps: 1. Load the metal powder to be processed into the powder feeder (2); 2. Start the vacuum pumping device (12), pump the vacuum degree of the metal powder purification chamber device (3), the exhaust gas circulation filter (6) and the gas oxygen and nitrogen purifier (8) to more than 1×10 ^-3 Pa, and close it. Vacuuming device (12); 3. Fill the metal powder purification chamber device (3), the exhaust gas circulation filter (6) and the gas oxygen and nitrogen purifier (8) with high-purity argon through the gas storage device (11) to make the pressure reach 0.2Pa～0.5 Pa; turn on the plasma generator (1), adjust the voltage of the plasma generator (1) to be 90-120V and the current to be 150-300A; adjust the flow rate of the argon gas flowing into the plasma generator (1) to be 1.5～120V 2.0L/h, generating a plasma torch; 4. Turn on the powder feeder (2), adjust the argon flow into the powder feeder 3 so that the powder feeding speed of the powder feeder 3 reaches 0.5-1kg/h, and send the metal powder into the metal powder purification chamber (3) middle; the metal powder falls into the first metal powder collector (4) after being processed by the high-temperature plasma torch generated by the plasma generator (1); at the same time, the argon gas used for generating the plasma torch and the raw material powder are transported The argon gas enters the exhaust gas circulation filter (6) through the first heat exchanger (5) through the air outlet at the bottom of the metal powder purification chamber (3), and the filtered metal powder falls into the second metal powder collector ( 7), the argon gas then enters the gas oxygen and nitrogen purifier (8) to remove impurities, then is cooled by the second heat exchanger (9), compressed by the gas compressor (10), and returned to the gas storage device (11) middle; the spherical powder in the first metal powder collector (4) is the product. 10. The method according to claim 9 for shaping, refining and purifying metal powder using the device of claim 1, wherein the metal powder in step 1 is iron powder, stainless steel powder, non-ferrous metal powder or special metal powder.

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