Molten metal film atomization device and method for vacuum induction melting gas atomization

Abstract

The molten metal film atomization device comprises a tundish container, a flow guide pipe, a flow guide nozzle and a flat seam type airflow nozzle, the tundish container is provided with a containing inner cavity used for containing molten metal, the flow guide pipe is communicated with the containing inner cavity, a liquid outlet channel is formed in the flow guide nozzle, and the flat seam type airflow nozzle is communicated with the containing inner cavity. A first end opening of the liquid outlet channel is communicated with the flow guide pipe, a second end opening of the liquid outlet channel is a rectangular liquid spraying opening, the proportion of the length L1 to the width W1 of the liquid spraying opening is larger than or equal to 8, and the width W1 ranges from 0.3 mm to 1.2 mm; the flat seam type airflow nozzle is provided with a rectangular air jet hole, the width W2 of the air jet hole is 0.2-0.6 mm, the length L2 of the air jet hole is equal to L1 + B, and the value of B is-5mm to 5mm; the included angle between the length direction of the air spraying opening and the length direction of the liquid spraying opening is 0-10 degrees, and the included angle between the spraying direction of the air spraying opening and the spraying direction of the liquid spraying opening is 10-80 degrees.

Description

Technical Field

[0001] The present invention relates to the technical field of metal powder production, and particularly to a metal liquid film atomization device and method for vacuum induction melting gas atomization. Background Art

[0002] Vacuum Induction Melting Inert Gas Atomization (abbreviated as VIGA technology) is a common method for preparing metal powders. Its main principle is to first melt the metal into a liquid state in a vacuum induction furnace, and then use high-pressure inert gas (such as argon or nitrogen) to break the liquid metal into fine droplets, which rapidly solidify during the falling process to form metal powders. In the traditional VIGA process, the metal liquid flow usually forms a columnar flow through a cylindrical nozzle (3) and is then atomized by an annular array of gas nozzles, which has the following problems: 1. Low production efficiency: The columnar liquid flow is limited by the diameter, resulting in a low output per unit time. 2. Low atomization efficiency: The contact area between the columnar liquid flow and the gas flow is limited, and the energy transfer efficiency is low, resulting in a wide particle size distribution of the powder. 3. Droplet splashing: The columnar liquid flow is easily impacted by the gas flow to generate large particle splashing, leading to the problem of wall sticking in the powder collection chamber. 3. Difficult to control production stability: Because the temperature field, fluid field, and pressure field change constantly during the melting to atomization process, it becomes difficult to control the stability of the liquid flow and atomization, and there is currently no effective means to control the parameter changes in real time. Summary of the Invention

[0003] In view of the above-mentioned disadvantages of the prior art, the technical problem to be solved by the present invention is to provide a metal liquid film atomization device and method for vacuum induction melting gas atomization, which replaces liquid column atomization with liquid film atomization to improve production efficiency and atomization efficiency.

[0004] To achieve the above object, the present invention provides a metal liquid film atomization device for vacuum induction melting gas atomization, including a tundish container, a diversion tube, a nozzle, and a flat slit gas nozzle. The tundish container is provided with a receiving inner cavity for accommodating the metal liquid. The diversion tube is communicated with the receiving inner cavity. The nozzle is provided with a liquid outlet channel, and the first port of the liquid outlet channel is communicated with the diversion tube, and the second port is a rectangular liquid spraying port. The ratio of the length L1 to the width W1 of the liquid spraying port is greater than or equal to 8, and the width W1 is 0.3 - 1.2 mm. The flat slit gas nozzle has a rectangular gas jetting port, the width W2 of the gas jetting port is 0.2 - 0.6 mm, and the length L2 = L1 + B, where B ranges from -5 mm to 5 mm. The included angle between the length direction of the gas jetting port and the length direction of the liquid spraying port is 0 - 10°, and the included angle between the gas jetting direction of the gas jetting port and the liquid spraying direction of the liquid spraying port is 10° - 80°.

[0005] Further, the flow direction of the molten metal in the liquid outlet channel is the extending and conveying direction of the liquid outlet channel. The cross-section perpendicular to the extending length direction of the liquid outlet channel at each part is rectangular, and the first port of the liquid outlet channel is larger than the liquid spraying port.

[0006] Further, corrugated guiding ribs are arranged on the inner wall of the long side of the liquid outlet channel in the guiding nozzle. The corrugated guiding ribs are corrugated in the extending and conveying direction of the liquid outlet channel and extend straight in the length direction of the liquid outlet channel.

[0007] Further, a first heating mechanism for heating the molten metal in the guiding nozzle is further included.

[0008] Further, the upper side of the accommodating inner cavity of the tundish container is open, and its length direction extends along a straight line. The accommodating inner cavity includes a middle straight section and arc-shaped end sections at both ends of the middle straight section in the length direction. The side walls of the arc-shaped end sections are arc-shaped in both the height direction and the width direction. The middle straight section is arc-shaped in the cross-section perpendicular to the length direction and has a diameter of D. The total length L3 of the accommodating inner cavity is 0.6 - 3 m, the maximum width W3 is 0.2 - 1 m, the height H1 is 1 - 2 m, and the ratio of the total length L3 to the diameter D of the middle straight section is 3:1 - 8:1.

[0009] Further, a rectangular discharge port is arranged at the bottom of the accommodating inner cavity. The length direction of the discharge port is along the length direction of the accommodating inner cavity, and the length of the discharge port is 0.5 - 2.8 m, and the width is 50 - 100 mm.

[0010] Further, a plurality of flat slit-type air nozzles are provided and spray at a plurality of different positions in the spraying direction of the liquid spraying port.

[0011] Further, a plurality of flat slit-type air nozzles are provided and spray at a plurality of different positions in the spraying direction of the liquid spraying port.

[0012] Further, a beating layer that wraps the outside of the tundish container and bears the tundish container is further included, and the beating layer has a heat preservation function.

[0013] Further, a liquid film detection mechanism for detecting the state of the liquid film sprayed from the guiding nozzle is further included. The liquid film detection mechanism includes a temperature detector for detecting the temperature of the liquid film and a thickness detector for detecting the thickness of the liquid film.

[0014] The present invention further provides a method for atomizing a molten metal film in vacuum induction melting gas atomization, which is carried out by using the above-mentioned molten metal film atomization device, and includes the following steps:

[0015] S1. The molten metal liquid in the tundish container enters the nozzle through the diversion tube and sprays out through the liquid spraying port of the nozzle to form a liquid film.

[0016] S2. The high-pressure gas is sprayed from the gas spraying port of the flat slit type gas nozzle onto the liquid film, breaking the liquid film into fine liquid droplets.

[0017] As described above, the metal liquid film atomization device and method involved in the present invention have the following beneficial effects:

[0018] 1. By designing the shape structure of the nozzle and the matching flat slit type gas nozzle, replacing liquid column atomization with liquid film atomization can enable the high-pressure gas to act on the liquid film better, thereby improving production efficiency and atomization efficiency and reducing energy consumption.

[0019] 2. The liquid outlet channel of the nozzle is in a contracted manner, and wavy diversion ribs 33 are provided on the inner wall surface, which can improve the flow state of the molten metal and inhibit the contraction of the liquid film edge.

[0020] 3. By designing the shape of the tundish container and the shape of the diversion tube, in cooperation with the nozzle, it is ensured that the molten metal can flow into the nozzle in a narrow and long manner, so as to better form a liquid film in the nozzle. Brief Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the metal liquid film atomization device of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the diversion tube in the present invention.

[0023] Figure 3 It is a cross-sectional view of the nozzle in the present invention.

[0024] Figure 4 It is a schematic heating diagram of the nozzle in the present invention.

[0025] Figure 5 It is a schematic structural diagram of the flat slit type gas nozzle in the present invention.

[0026] Figure 6 It is a schematic structural diagram of the tundish container in the present invention.

[0027] Figure 7 It is a top view of the tundish container in the present invention.

[0028] Figure 8 It is Figure 7 the A-A cross-sectional view in

[0029] Figure 9 It is a schematic working process diagram of the liquid film detection mechanism in the present invention.

[0030] Explanation of the Attached Reference Numerals

[0031] 1 tundish container

[0032] 11 accommodating cavity

[0033] 111 middle straight section

[0034] 112 arc-shaped end section

[0035] 12 discharge port

[0036] 13 fitting groove

[0037] 2 diversion pipe

[0038] 21 side edge plate

[0039] 3 nozzle

[0040] 31 liquid outlet channel

[0041] 32 liquid spraying port

[0042] 33 wavy diversion rib

[0043] 4 liquid film

[0044] 5 flat slit-type air nozzle

[0045] 51 air jet port

[0046] 6 beaten layer

[0047] 7 electromagnetic induction coil

[0048] 8 outer shell

[0049] 9 cooling coil

[0050] 10 liquid film detection mechanism

[0051] 101 infrared thermal imager

[0052] 102 laser thickness gauge Specific Embodiments

[0053] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0054] It should be noted that the structures, ratios, sizes, etc. depicted in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the ratio relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of narration and understanding, and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0055] See Figures 1 to 9 , the present invention provides a metal liquid film atomization device for vacuum induction melting gas atomization, including a tundish container 1, a diversion tube 2, a diversion nozzle 3, and a flat slit-type gas flow nozzle 5. The tundish container 1 is provided with a receiving inner cavity 11 for receiving molten metal. The diversion tube 2 is communicated with the receiving inner cavity 11. The diversion nozzle 3 is provided with a liquid outlet channel 31, and the first port of the liquid outlet channel 31 is communicated with the diversion tube 2, and the second port is a rectangular liquid spraying port 32. The ratio of the length L1 to the width W1 of the liquid spraying port 32 is greater than or equal to 8, and the width W1 is 0.3 - 1.2 mm. The flat slit-type gas flow nozzle 5 has a rectangular gas jet port 51, the width W2 of the gas jet port 51 is 0.2 - 0.6 mm, and the length L2 = L1 + B, where B ranges from -5 mm to 5 mm. The included angle between the length direction of the gas jet port 51 and the length direction of the liquid spraying port 32 is 0 - 10°, and the included angle between the jet direction of the gas jet port 51 and the jet direction of the liquid spraying port 32 is 10° - 80°.

[0056] The main working principle of the molten metal film atomization device involved in the present invention is as follows: During operation, the molten metal in the tundish container 1 enters the nozzle 3 through the diversion tube 2 under the action of gravity or internal pressure, and is ejected through the liquid ejection port 32 of the nozzle 3. Since the liquid ejection port 32 is a long and narrow rectangle with an aspect ratio greater than 8, the width W1 is 0.3 - 1.2 mm, and the length can be set according to actual needs. In this way, when the molten metal is ejected from the liquid ejection port 32, a liquid film 4 with a thickness of 50 - 200 μm and relatively uniform can be formed. The flat-slit type gas flow nozzle also ejects high-pressure inert gas through the long and narrow gas ejection port 51, and the ejected gas is also flat. Since the gas ejection port 51 is basically parallel to the liquid ejection port 32 or has a slight inclination angle (the included angle between the length directions of the two is 0 - 10°), and the lengths are similar (the length difference is -0.3 - 1.2 mm), the high-pressure gas ejected from the gas ejection port 51 can contact the liquid film 4 well, and the two can interact well, so that the molten metal can be atomized better. Compared with the existing design, the liquid film 4 atomization is used to replace the liquid column atomization, which improves the production efficiency and atomization efficiency, and can reduce the energy consumption.

[0057] See Figures 1 to 9 , the following further illustrates the present invention with specific embodiments:

[0058] See Figure 1 , Figure 6 , Figure 7 and Figure 8, in this embodiment, as a preferred design, the tundish container 1 is a crucible, and its material is graphite or corundum. The upper side of the accommodating inner cavity 11 is open, which is convenient for pouring molten metal. The length direction of the accommodating inner cavity 11 extends along a straight line, and in the length direction, it includes a middle straight section 111 and arc end sections 112 located at both ends of the middle straight section 111. The side walls of the arc end sections 112 are circular arcs in both the height direction and the width direction. The middle straight section 111 is also a circular arc in the cross-section perpendicular to its length direction, and the diameter is D; the total length L3 of the accommodating inner cavity 11 is 0.6 - 3m, the maximum width W3 is 0.2 - 1m, the height H1 is 1 - 2m, and the ratio of the total length L3 to the diameter D of the middle straight section 111 is 3:1 - 8:1. The entire accommodating inner cavity 11 is similar to a capsule shape with round ends and a straight middle. The bottom of the accommodating inner cavity 11 is provided with a rectangular discharge port 12 for the installation and connection of the diversion tube 2. The length direction of the discharge port 12 is along the length direction of the accommodating inner cavity 11, and the length of the discharge port 12 is 0.5 - 2.8m, and the width is 50 - 100mm, which is convenient for the molten metal to enter the diversion tube 2 in a narrow and long manner. When the molten metal is poured into the accommodating inner cavity 11, the larger aspect ratio of the accommodating inner cavity 11 enables the molten metal to have a longer flow distance in the accommodating inner cavity 11, can provide a wider and slender flow space for the molten metal, helps to extend the residence time of the molten metal flow, is beneficial to the uniform mixing inside the molten metal and reduces the temperature gradient, and can better flow out from the narrow discharge port 12. In other embodiments, the tundish container 1 can also adopt other suitable containers except for the crucible.

[0059] See Figure 1 and Figure 2 , in this embodiment, as a preferred design, the diversion tube 2 is vertically arranged, and its inner cavity also extends vertically. The exterior and the inner cavity of the diversion tube 2 are both rectangular in the horizontal cross-section, and the wall thickness of the tube is preferably 5 - 20mm, so as to better connect with the tundish container 1 and the nozzle 3. The diversion tube 2 is installed on the crucible in a detachable manner. Preferably, side edge plates 21 are provided on four sides of the upper end of the diversion tube 2, and the diversion tube 2 is T-shaped in the cross-sections perpendicular to and parallel to its length direction. An embedded groove 13 is provided at the bottom of the accommodating inner cavity 11 of the tundish container 1. See Figure 6 and Figure 8 , the discharge port 12 is located in the bottom surface of the embedded groove 13, and the embedded groove 13 and the discharge port 12 form a T-shaped stepped hole structure. During installation, the diversion tube 2 is inserted into the discharge port 12 from the upper end. The length and width of the diversion tube 2 are adapted to the length and width of the discharge port 12. Preferably, the length of the diversion tube 2 is 20 - 70mm. The side edge plates 21 around the upper end of the diversion tube 2 are installed in the embedded groove 13, and a good fit is achieved to ensure a certain degree of airtightness and prevent molten metal from entering the gap. The lower end of the diversion tube 2 is provided with bolt holes around a circle, which is convenient for the nozzle 3 to be bolted to the diversion tube 2. The material of the diversion tube 2 is preferably graphite, molybdenum niobium alloy or zirconia.

[0060] See Figure 1 、 Figure 2 and Figure 3 In this embodiment, the flow direction of the molten metal in the liquid outlet channel 31 is denoted as the extended conveying direction of the liquid outlet channel 31. As a preferred design, the extended conveying direction of the liquid outlet channel 31 is in a straight line and vertical. At this time, the spraying direction of the liquid spraying port 32 is vertical. The cross-section perpendicular to the extended conveying direction of each part of the liquid outlet channel 31 is rectangular, and the first port of the liquid outlet channel 31 is larger than the liquid spraying port 32. The overall design of the entire liquid outlet channel 31 gradually contracts from the first port to the liquid spraying port 32, which can increase the spraying pressure of the molten metal. Further, a wavy guiding rib 33 is provided on the inner wall of the long side of the liquid outlet channel 31. The wavy guiding rib 33 is wavy in the extended conveying direction of the liquid outlet channel 31 and has a plurality of wave crests and wave troughs. The height between the wave crests and wave troughs of the wavy guiding rib 33 is 0.02 - 0.12 mm, the distance between adjacent wave crests is 0.5 - 2 mm. The wavy guiding rib 33 extends straight in the length direction of the liquid outlet channel 31 and is parallel to the liquid spraying port 32, and its length is less than or equal to L1. During the flow of the molten metal, the edge of the liquid film 4 is easily affected by factors such as surface tension and undergoes contraction. The wavy guiding rib 33 can reduce the occurrence of this contraction phenomenon by changing the direction and speed of the liquid flow. At the same time, by optimizing the topology of the liquid outlet channel 31 through CFD (Computational Fluid Dynamics) simulation technology, the flow performance of the molten metal in the liquid outlet channel 31 can be further improved, ensuring the uniformity and stability of the liquid film 4. In other embodiments, when the wavy guiding rib 33 is not provided on the inner wall of the liquid outlet channel 31, it can gradually and smoothly become smaller from the first port to the liquid spraying port 32.

[0061] See Figure 1 、 Figure 3 and Figure 4 In this embodiment, as a preferred design, the guiding nozzle 3 is made of graphite, and further includes a first heating mechanism for heating the molten metal in the guiding nozzle 3. The first heating mechanism can adopt the current heating method. Both ends of the guiding nozzle 3 are directly connected to a high-voltage power supply through wires, and heating is performed when the current passes through the guiding nozzle 3, preventing the molten metal from cooling and solidifying at the guiding nozzle 3 and ensuring that the molten metal can be smoothly sprayed out.

[0062] See Figure 1, in this embodiment, as a preferred design, a plurality of flat slit air nozzles 5 are provided and spray at multiple different positions of the spraying direction of the liquid spraying port 32. Further, flat slit air nozzles 5 are provided on both sides of the liquid spraying port 32 of the flow guide nozzle 3 and are arranged opposite to each other on both sides of the liquid spraying port 32. In this embodiment, the spraying direction of the liquid spraying port 32 is vertically downward, and the spraying direction of the air jet port 51 is obliquely downward. Therefore, a flat slit air nozzle 5 is provided on both sides at multiple different heights, and adjacent flat slit air nozzles 5 have an appropriate height difference. By adopting this method, multiple atomizations of the liquid film 4 can be achieved, improving the atomization effect and the fine powder yield. In this embodiment, the length direction of the air jet port 51 is parallel to the length direction of the liquid spraying port 32, that is, the included angle between the two is 0°, which better blows the liquid film 4 for atomization.

[0063] See Figure 1 , in this embodiment, as a preferred design, the tundish container 1 is a crucible, and further includes a rammed layer 6 wrapped outside the crucible and bearing the tundish container 1, and the rammed layer 6 has a heat preservation function for reducing the heat dissipation of the molten metal in the tundish container 1. The material of the rammed layer 6 is magnesia, magnesia-chrome, or magnesia-calcium material. The rammed layer 6 is in a cuboid shape, with the length and width being 10 - 50 mm more than the crucible, and the height is lower than the crucible, and the height difference range is 10 - 50 mm, so as to prevent the debris generated by the rammed layer 6 from falling into the crucible. The inside of the rammed layer 6 fits well with the crucible, and there is an opening at the bottom, and the opening size is set according to the size of the flow guide pipe 2 for the flow guide pipe 2 to pass through.

[0064] In this embodiment, see Figure 1 , as a preferred design, the molten metal film atomization device further includes a second heating mechanism for heating the molten metal in the tundish container 1. The second heating mechanism includes an electromagnetic induction coil 7 arranged in the rammed layer 6. The electromagnetic induction coil 7 surrounds the entire crucible and can heat the molten metal when energized, thus ensuring the temperature of the molten metal. In other embodiments, the second heating mechanism can also adopt other suitable heating structures.

[0065] In this embodiment, see Figure 1 , as a preferred design, the molten metal film atomization device further includes a housing 8. The rammed layer 6 and the crucible are both located in the housing 8. The housing 8 is made of stainless steel and wraps the rammed layer 6. The top of the housing 8 is a switchable heat preservation cover, and there is a ventilation hole in the heat preservation cover for external gas to enter and pressurize. The housing 8 plays a protective role and stabilizes the internal pressure. Further, a cooling mechanism capable of cooling the housing 8 is also provided. The cooling mechanism includes a cooling coil 9 welded to the housing 8 for connecting a cooling medium to prevent the temperature of the housing 8 from being too high through the cooling mechanism. The cooling mechanism can also adopt other suitable designs.

[0066] In this embodiment, see Figure 1, As a preferred design, the metal liquid film atomization device further includes a liquid film detection mechanism 10 for detecting the state of the liquid film 4 ejected from the flow guide nozzle 3. The liquid film detection mechanism 10 includes a temperature detector for detecting the temperature of the liquid film 4 and a thickness detector for detecting the thickness of the liquid film 4. The temperature detector can be an infrared thermal imager 101 or other instruments that can possibly achieve the corresponding temperature measurement function. The thickness detector can be a laser thickness gauge 102 or other suitable instruments that can achieve this function. Through the liquid film detection mechanism 10, a feedback adjustment mechanism can be established. See Figure 9 , according to the feedback of the temperature and thickness information of the liquid film 4 monitored in real time by the infrared thermal imager 101 and the laser thickness gauge 102, the system automatically adjusts the melting power, the tundish heating power (i.e., the heating power of the second heater), and the atomization pressure to achieve the automatic real-time adjustment of the particle size distribution and other properties of the powder product.

[0067] The present invention also provides a metal liquid film atomization method for vacuum induction melting gas atomization, which is carried out by using the above metal liquid film atomization device, and includes the following steps:

[0068] S1. The molten metal liquid in the tundish container 1 enters the flow guide nozzle 3 through the flow guide pipe 2 and is ejected through the liquid ejection port 32 of the flow guide nozzle 3 to form a liquid film 4. Preferably, in this embodiment, when the metal liquid is in the tundish container 1, the temperature of the metal liquid is controlled by the electromagnetic induction coil 7 of the second heating mechanism, and it enters the flow guide nozzle 3 under the action of gravity through the flow guide pipe 2. At the same time, the metal liquid passing through the flow guide nozzle 3 is also heated by the first heating mechanism to prevent solidification and blockage of the flow guide nozzle 3.

[0069] S2. The jet orifice 51 of the flat slit type gas flow nozzle 5 ejects high-pressure gas towards the liquid film 4 to break the liquid film 4 into fine liquid droplets. Preferably, in this embodiment, the flat slit type gas flow nozzle 5 at different heights ejects high-pressure gas at different heights of the liquid film 4 to achieve multiple atomizations. During the atomization process, the liquid film 4 is monitored by the liquid film detection mechanism 10 at the same time, and a feedback adjustment mechanism is established.

[0070] As can be seen from the above, the metal liquid film atomization device and method of the present invention have the following beneficial effects:

[0071] 1. By designing the shape and structure of the flow guide nozzle 3 and the cooperating flat slit type gas flow nozzle 5, replacing liquid column atomization with liquid film 4 atomization can enable the high-pressure gas to act on the liquid film 4 better, thereby improving the production efficiency and atomization efficiency and reducing energy consumption.

[0072] 2. The liquid outlet channel 31 of the flow guide nozzle 3 is in a contracted manner and is provided with wavy flow guide ribs 33 on the inner wall surface, which can improve the flow state of the metal liquid and inhibit the shrinkage of the edge of the liquid film 4.

[0073] 3. By designing the shapes of the tundish container 1 (crucible) and the flow guide pipe 2 and coordinating them with the flow guide nozzle 3, it is ensured that the molten metal can flow into the flow guide nozzle 3 in a narrow and long manner, so as to better form a liquid film 4 in the flow guide nozzle 3 for the molten metal.

[0074] In summary, the present invention effectively overcomes various drawbacks in the prior art and has high industrial utilization value.

[0075] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A metal liquid film atomization device for vacuum induction melting gas atomization, characterized in that: The invention comprises a tundish container (1), a flow guide pipe (2), a flow guide nozzle (3) and a flat slot air flow nozzle (5), wherein the tundish container (1) is provided with a receiving inner cavity (11) for receiving molten metal, the flow guide pipe (2) is connected to the receiving inner cavity (11), the flow guide nozzle (3) is provided with a liquid outlet channel (31), a first port of the liquid outlet channel (31) is connected to the flow guide pipe (2), and a second port is a rectangular liquid injection port (32), and a ratio of a length L1 to a width W1 of the liquid injection port (32) is greater than The flat slot airflow nozzle (5) has a rectangular air jet (51), the width W2 of the air jet (51) is 0.2 to 0.6 mm, the length L2 = L1 + B, and the value of B is -5 mm to 5 mm; the angle between the length direction of the air jet (51) and the length direction of the liquid spraying port (32) is 0 to 10°, and the angle between the spraying direction of the air jet (51) and the spraying direction of the liquid spraying port (32) is 10° to 80°.

2. The metal liquid film atomization device according to claim 1, characterized in that: The flow direction of the metal liquid in the liquid outlet channel (31) is the extension conveying direction of the liquid outlet channel (31), the cross-section of the liquid outlet channel (31) at all locations perpendicular to its extension length direction is rectangular, and the first port of the liquid outlet channel (31) is larger than the liquid injection port (32).

3. The metal liquid film atomization device according to claim 1 or 2, characterized in that: A wavy flow-guiding rib (33) is provided on the inner wall of the long side of the liquid outlet channel (31) in the flow-guiding nozzle (3); the wavy flow-guiding rib (33) is wavy in the extending conveying direction of the liquid outlet channel (31) and extends straight in the length direction of the liquid outlet channel (31).

4. The metal liquid film atomization device according to claim 1, characterized in that: It also comprises a first heating mechanism for heating the molten metal in the guide nozzle (3).

5. The metal liquid film atomization device according to claim 1, characterized in that: The upper side of the accommodating inner cavity (11) of the intermediate package container (1) is open, and its length direction extends in a straight line. The accommodating inner cavity (11) includes a middle straight section (111) and arc-shaped end sections (112) located at both ends of the middle straight section (111) in the length direction. The side walls of the arc-shaped end sections (112) are arc-shaped in both the height direction and the width direction. The middle straight section (111) is arc-shaped in a cross section perpendicular to the length direction, and has a diameter D. The total length of the accommodating inner cavity (111) is a total length L3 of 0.6 to 3 m, a maximum width W3 of 0.2 to 1 m, a height H1 of 1 to 2 m, and a ratio of the total length L3 to the diameter D of the middle straight section (111) of 3:1 to 8:

1.

6. The metal liquid film atomization device according to claim 5, characterized in that: A rectangular discharge port (12) is provided at the bottom of the accommodating inner cavity (11), and the length direction of the discharge port (12) is along the length direction of the accommodating inner cavity (11), and the length of the discharge port (12) is 0.5-2.8m and the width is 50-100mm.

7. The metal liquid film atomization device according to claim 1, characterized in that: The flat slit airflow nozzles (5) are provided in plurality and spray at a plurality of different positions in the spraying direction of the liquid spraying port (32).

8. The metal liquid film atomization device according to claim 1, characterized in that: It also comprises a built layer (6) which is wrapped around the outside of the intermediate ladle container (1) and supports the intermediate ladle container (1), and the built layer (6) has a heat-insulating function.

9. The metal liquid film atomization device according to claim 1, characterized in that: It also includes a liquid film detection mechanism (10) for detecting the state of the liquid film (4) sprayed by the guide nozzle (3), and the liquid film detection mechanism (10) includes a temperature detector for detecting the temperature of the liquid film (4) and a thickness detector for detecting the thickness of the liquid film (4).

10. A method for atomizing a metal liquid film in vacuum induction melting gas atomization, characterized in that: The method is carried out using the metal liquid film atomization device as described in any one of claims 1 to 9, comprising the following steps: S1, the molten metal liquid in the tundish container (1) enters the guide nozzle (3) through the guide pipe (2), and is sprayed out through the spray port (32) of the guide nozzle (3) to form a liquid film (4); S2. The jet port (51) of the flat slot-type airflow nozzle (5) jets high-pressure gas toward the liquid film (4), breaking the liquid film (4) into fine droplets.

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