Magnesium steam collecting device, using method of magnesium steam collecting device and magnesium smelting system

Abstract

The invention belongs to the technical field of magnesium smelting, and particularly discloses a magnesium steam collecting device, a using method of the magnesium steam collecting device and a magnesium smelting system. The magnesium steam collecting device comprises a collecting tank body and a cooling coil pipe, the collecting tank body is provided with a collecting cavity, an air inlet and an air outlet are formed in the two ends of the collecting tank body in the first direction of the collecting tank body respectively, the air inlet is used for being communicated with a magnesium steam output port of the magnesium smelting device, and the air outlet is used for being communicated with the vacuumizing device; the cooling coil is a magnesium cooling coil, is provided with a cooling medium inlet and a cooling medium outlet, and is detachably arranged in the collecting cavity. The process of stripping collected crude magnesium can be reduced, the labor intensity is reduced, the service life of the collecting device is prolonged, and the safety in the transportation process is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of magnesium smelting, and in particular relates to a magnesium vapor collecting device, a method for using the magnesium vapor collecting device and a magnesium smelting system. Background Art

[0002] In the related art, the magnesium vapor collection method of the Pidgeon process is to collect solid crude magnesium in a water-cooled crystallizer, but the crude magnesium condenses on the crystallizer at the end of the reduction tank, and the crude magnesium needs to be peeled off from the crystallizer manually or mechanically, which is labor-intensive. The peeling process may deform the reduction tank and reduce the service life of the reduction tank. The magnesium vapor collection method of the continuous magnesium smelting process is to collect liquid crude magnesium, but liquid crude magnesium has active chemical properties and will react violently or even explode when it comes into contact with water and other reactants, so the safety requirements of the transportation process are very high. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, an embodiment of the present invention provides a magnesium vapor collection device, which can reduce the stripping process of the collected crude magnesium, reduce labor intensity, and increase the service life of the collection device and the safety of the transportation process.

[0004] The embodiment of the present invention also provides a method for using the magnesium vapor collecting device.

[0005] An embodiment of the present invention further provides a magnesium smelting system.

[0006] The magnesium vapor collection device of the embodiment of the present invention includes: a collection tank body, the collection tank body having a collection cavity, in a first direction of the collection tank body, two ends of the collection tank body are respectively provided with an air inlet and an air outlet connected to the collection cavity, the air inlet is used to communicate with the magnesium vapor output port of the magnesium smelting device, and the air outlet is used to communicate with the vacuum device; a cooling coil, the cooling coil is a magnesium cooling coil, the cooling coil has a cooling medium inlet and a cooling medium outlet, and the cooling coil is detachably arranged in the collection cavity.

[0007] When the magnesium vapor collecting device in this embodiment is used, the vacuum device vacuums the collection tank through the air outlet, and transports the cooling medium into the cooling coil through the cooling medium inlet. The magnesium refining device transports magnesium vapor into the collection tank through the air inlet. After the magnesium vapor contacts the cooling coil, it can condense into crude magnesium on the cooling coil. Since the cooling coil is a magnesium cooling coil, the cooling coil and the crude magnesium can be transported together to the magnesium refining process for refining. There is no need to peel the crude magnesium from the cooling coil, which reduces labor intensity and increases the service life of the collection device. In addition, the crude magnesium is condensed on the cooling coil in a solid state, which improves the safety of the transportation process.

[0008] In this embodiment, a plurality of cooling coils are provided, and the plurality of cooling coils are arranged at intervals in the first direction.

[0009] In this embodiment, the plurality of cooling coils are divided into a plurality of rows, and the plurality of rows of cooling coils are sequentially distributed along a second direction perpendicular to the first direction.

[0010] In this embodiment, the magnesium vapor collection device further includes a first seal, and mounting holes are provided on the side wall of the collection tank body corresponding to the cooling medium inlet and the cooling medium outlet, and the cooling medium inlet and the cooling medium outlet are both sealed and connected to the mounting holes through the first seal.

[0011] In this embodiment, the flow channel of the cooling coil is S-shaped.

[0012] In this embodiment, the collecting tank body comprises an upper tank body and a lower tank body which are arranged one above the other, and the upper tank body and the lower tank body are detachable and sealedly connected.

[0013] In this embodiment, the magnesium vapor collecting device further comprises a vacuum gauge, which is disposed on the collecting tank body and is used to measure the vacuum degree in the collecting chamber.

[0014] The method for using the magnesium vapor collecting device in this embodiment is used for the above-mentioned magnesium vapor collecting device. The method for using the magnesium vapor collecting device includes the following steps:

[0015] The vacuuming device is used to evacuate the collection chamber and convey cooling medium into the cooling coil; magnesium vapor is conveyed to the air inlet; air is introduced into the collection tank to balance the internal and external air pressures; and the cooling coil is removed from the collection tank.

[0016] The magnesium smelting system in this embodiment includes a magnesium smelting electric furnace and the above-mentioned magnesium vapor collecting device, and the air inlet of the magnesium vapor collecting device is connected to the magnesium vapor outlet of the magnesium smelting electric furnace.

[0017] In this embodiment, a plurality of magnesium vapor collecting devices are provided, and the plurality of magnesium vapor collecting devices are alternately connected to the magnesium smelting electric furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 4 is a first cross-sectional view of the magnesium vapor collecting device according to an embodiment of the present invention.

[0019] Figure 2 It is a side structural schematic diagram of a magnesium vapor collecting device according to an embodiment of the present invention.

[0020] Figure 3 4 is a second cross-sectional view of the magnesium vapor collecting device according to the embodiment of the present invention.

[0021] Figure 4 yes Figure 3 Schematic diagram of the local structure in.

[0022] Reference numerals:

[0023] 1. Air inlet; 2. Air outlet; 3. Upper tank body; 4. Cooling coil; 5. Lower tank body; 6. First sealing member; 7. Lifting ear; 8. Vacuum gauge; 9. Cooling medium outlet; 10. Cooling medium inlet; 11. Bracket. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] like Figures 1 to 3 As shown, the magnesium vapor collecting device in this embodiment includes a collecting tank body and a cooling coil 4, the collecting tank body has a collecting cavity, and in the first direction of the collecting tank body (X direction in the figure), the two ends of the collecting tank body are respectively provided with an air inlet 1 and an air outlet 2, the air inlet 1 is used to communicate with the magnesium vapor output port of the magnesium smelting device, and the air outlet 2 is used to communicate with the vacuum device; the cooling coil 4 is a magnesium cooling coil 4, the cooling coil 4 has a cooling medium inlet 10 and a cooling medium outlet 9, and the cooling coil 4 is detachably arranged in the collecting cavity.

[0026] Specifically, the height of the cooling medium inlet 10 is lower than the height of the cooling medium outlet 9, so that the cooling medium can fill the cooling coil 4, help to discharge the air in the cooling coil 4, avoid air blocking, and help to achieve a better cooling effect. In addition, arranging the cooling medium outlet 9 at the top helps the hot water after heat exchange to automatically rise and be discharged, while the colder cooling medium enters at the bottom, forming a natural convection cycle and enhancing the heat exchange efficiency. The cooling medium delivered to the cooling medium inlet 10 can be cooling water, and of course, other cooling media can also be input as needed, which is not limited here.

[0027] like Figure 3 As shown, a bracket 11 is provided in the collecting chamber, and the cooling coil 4 can be detachably connected to the bracket 11 or overlapped on the bracket 11. The cooling coil 4 is supported by the bracket 11, so that the cooling coil 4 can be stably fixed. The specific structure of the bracket 11 can be set as needed and is not limited here.

[0028] When the magnesium vapor collecting device in this embodiment is used, the vacuum device vacuums the collection tank body through the air outlet 2, and transports the cooling medium into the cooling coil 4 through the cooling medium inlet 10. The magnesium refining device transports magnesium vapor into the collection tank body through the air inlet 1. After the magnesium vapor contacts the cooling coil 4, it can condense into crude magnesium on the cooling coil 4. Since the cooling coil 4 is a magnesium cooling coil 4, the cooling coil 4 and the crude magnesium can be transported together to the magnesium refining process for refining. There is no need to peel the crude magnesium from the cooling coil 4, which reduces labor intensity and increases the service life of the collection device. In addition, the crude magnesium is condensed on the cooling coil 4 in a solid state, which improves the safety of the transportation process.

[0029] In this embodiment, if Figure 1 As shown, a plurality of cooling coils 4 are provided, and the plurality of cooling coils 4 are arranged at intervals in the first direction.

[0030] It can be understood that the first direction is the air intake direction of the collecting tank body, and multiple cooling coils 4 are arranged at intervals in the first direction, which can increase the contact area between the magnesium vapor and the cooling coils 4, so that more magnesium vapor molecules are condensed on the cooling coils 4, thereby improving the heat exchange efficiency. In addition, by setting up multiple cooling coils 4, the airflow can be dispersed to ensure the stability and efficiency of the condensation process.

[0031] In this embodiment, the plurality of cooling coils 4 are divided into a plurality of rows, and the plurality of rows of cooling coils 4 are sequentially distributed along a second direction (Y direction in the figure) perpendicular to the first direction.

[0032] For example, the plurality of cooling coils 4 are divided into two rows, and the two rows of cooling coils 4 are staggered, that is, in the first direction, the two rows of cooling coils 4 are alternately arranged in sequence, so that the cooling coils 4 can be distributed more evenly.

[0033] By providing multiple rows of cooling coils 4, the airflow can be dispersed more evenly, reducing the phenomenon of local overheating or insufficient condensation, which is conducive to making the condensation process more stable, and increasing the contact surface, which is conducive to improving the condensation efficiency.

[0034] In this embodiment, if Figure 3 As shown, the flow channel of the cooling coil 4 is S-shaped.

[0035] Specifically, the pipe sections of the cooling coil 4 can be distributed vertically orthogonal to the first direction and the second direction, or distributed along the second direction. The distribution direction of the cooling coil 4 can be set as needed and is not limited here.

[0036] By setting the flow channel of the cooling coil 4 to be S-shaped, the surface area of ​​the cooling coil 4 is increased, the flow path of the cooling medium is extended, heat exchange can be more fully performed, the crystallization area is increased, and the crystallization efficiency is improved.

[0037] In this embodiment, if Figure 3 and Figure 4 As shown, the magnesium vapor collection device also includes a first seal 6 , and mounting holes are provided on the side wall of the collection tank body corresponding to the cooling medium inlet 10 and the cooling medium outlet 9 , and the cooling medium inlet 10 and the cooling medium outlet 9 are both sealed and connected to the mounting holes through the first seal 6 .

[0038] Specifically, the cooling medium inlet 10 and the cooling medium outlet 9 both pass through the mounting hole and extend to the outside of the collecting tank body. Further, a protrusion is provided on the outer wall of the collecting tank body, and the mounting hole passes through the side wall and the protrusion of the collecting tank body. By providing the protrusion, the length of the mounting hole is extended, which is conducive to the sealing effect between the cooling medium inlet 10, the cooling medium outlet 9 and the mounting hole. For example, the first sealing member 6 is an annular sealing ring, and the sealing ring is arranged between the outer peripheral surface of the cooling coil 4 and the inner wall of the mounting hole. Specifically, the first sealing member includes a sealing portion and an end cover connected to each other, the sealing portion is located between the outer wall of the cooling coil 4 and the inner wall of the mounting hole, and the end cover is arranged on the outer peripheral surface of the cooling coil 4 and abuts on the side of the protrusion away from the collecting tank body. The sealing portion and the end cover are integrally formed, which can improve the strength of the first sealing member 6. By providing an end cover on one side of the sealing portion, the sealing portion can be taken out of the mounting hole by clamping the end cover, so that while ensuring the sealing effect, it is also convenient to take the cooling coil 4 out of the mounting hole.

[0039] In this embodiment, by setting a first sealing member 6 between the cooling medium inlet 10, the cooling medium outlet 9 and the mounting hole, the sealing effect between the cooling medium inlet 10 and the inner wall of the mounting hole, and between the cooling medium outlet 9 and the inner wall of the mounting hole is improved, which is beneficial to the vacuum operation in the collection tank.

[0040] In this embodiment, if Figure 2 and Figure 3 As shown, the collecting tank body includes an upper tank body 3 and a lower tank body 5 which are arranged one above the other. The upper tank body 3 and the lower tank body 5 are detachable and sealedly connected.

[0041] Specifically, the upper tank body 3 and the lower tank body 5 are assembled to form a collecting chamber. A second sealing member is provided between the upper tank body 3 and the lower tank body 5. A positioning groove can be provided on one of the two opposite sides of the upper tank body 3 and the lower tank body 5, and the second sealing member is arranged in the positioning groove, so as to facilitate the positioning of the second positioning member. For example, the second sealing member can be a rubber sealing member. The upper tank body 3 and the lower tank body 5 can be connected by bolts, so as to facilitate the installation and removal of the upper tank body 3 and the lower tank body 5.

[0042] Furthermore, if Figure 3 As shown, a lifting lug 7 is also provided on the upper tank body 3 . A plurality of lifting lugs 7 may be provided on the upper tank body 3 , so that a lifting device can lift the upper tank body 3 through the lifting lug 7 to install or disassemble the upper tank body 3 .

[0043] It is understandable that, by configuring the collecting tank body to be composed of the upper tank body 3 and the lower tank body 5, and the upper tank body 3 and the lower tank body 5 are detachably connected, after the upper tank body 3 is detached from the lower tank body 5, the cooling coil 4 and the crude magnesium condensed on the cooling coil 4 can be easily taken out of the collecting tank body, or the cooling coil 4 can be installed in the collecting tank body. When it is necessary to collect magnesium vapor, the upper tank body 3 and the lower tank body 5 are sealed and connected, which can facilitate the collection operation of the collecting tank body.

[0044] In this embodiment, if Figure 3 As shown, the magnesium vapor collecting device further includes a vacuum gauge 8, which is disposed on the collecting tank body and is used to measure the vacuum degree in the collecting chamber.

[0045] Specifically, the vacuum gauge 8 may be disposed on the upper tank body 3 to facilitate observation of the vacuum gauge 8 .

[0046] By providing the vacuum gauge 8, it is convenient to intuitively obtain the vacuum degree information in the collection tank, so as to start or stop the vacuuming in time.

[0047] When using the magnesium vapor collection device in this embodiment, the cooling medium inlet 10 and the cooling medium outlet 9 of the cooling coil 4 are installed corresponding to the mounting holes respectively, and the cooling coil 4 is fixed by the bracket 11. After all the cooling coils 4 are installed, the upper tank body 3 is hoisted above the lower tank body 5 and the upper tank body 3 and the lower tank body 5 are connected, and then the magnesium vapor collection operation is carried out. After the collection is completed, the upper tank body 3 is removed from the lower tank body 5, and finally the cooling coil 4 with condensed crude magnesium is removed, and the cooling coil 4 and the crude magnesium are transported together to the refining process for melting and refining. There is no need to peel the crude magnesium from the cooling coil 4, which reduces the labor intensity and improves the service life of the collection device.

[0048] The method for using the magnesium vapor collecting device in this embodiment is used for the above-mentioned magnesium vapor collecting device. The method for using the magnesium vapor collecting device includes the following steps:

[0049] S100, using a vacuum device to evacuate the collection chamber and transport cooling medium into the cooling coil 4;

[0050] Specifically, the vacuum pump includes a vacuum pump, which is connected to the air outlet 2 of the collection tank body, and the collection tank body can be vacuumed by the vacuum pump. The cooling medium transported to the cooling coil 4 can be water, which is low in cost and easy to obtain.

[0051] S200, delivering magnesium vapor to the air inlet 1 so that the magnesium vapor condenses on the cooling coil 4;

[0052] After the magnesium vapor contacts the cooling coil 4 , it can condense into crude magnesium on the cooling coil 4 .

[0053] S300, after the magnesium vapor condenses on the cooling coil 4 for a preset period of time, air is introduced into the collection tank to balance the internal and external air pressures;

[0054] For example, the preset duration may be 6 hours to 8 hours. Of course, the specific value of the preset duration may be adjusted according to actual conditions and is not limited here.

[0055] S400, removing the cooling coil 4 from the collecting tank.

[0056] Before removing the cooling coil 4 from the collecting tank, the upper tank 3 needs to be disassembled from the lower tank 5, so that the cooling coil 4 can be easily taken out from the collecting tank. After the cooling coil 4 is taken out, the cooling coil 4 is first dried and dehydrated to remove the cooling medium in the flow channel, and then the cooling coil 4 and the crude magnesium condensed on the cooling coil 4 are sent to the refining process for melting and refining. There is no need to peel the crude magnesium from the cooling coil 4, which reduces the labor intensity and increases the service life of the collection device.

[0057] The magnesium smelting system in this embodiment includes a magnesium smelting electric furnace (not shown in the figure) and the above-mentioned magnesium vapor collecting device, and the air inlet 1 of the magnesium vapor collecting device is connected to the magnesium vapor outlet of the magnesium smelting electric furnace.

[0058] The method for using the magnesium smelting system in this embodiment includes the following steps:

[0059] 1) adding a preset weight of ferrosilicon into a magnesium smelting furnace and heating it to a preset temperature to melt the ferrosilicon to form a molten pool;

[0060] Specifically, the ferrosilicon is ferrosilicon containing 75% Si. The temperature of heating the ferrosilicon is 1400° C. to 1500° C., for example, 1400° C., 1420° C., 1450° C., 1470° C., 1480° C. or 1500° C., etc. The specific temperature can be adjusted according to actual conditions and is not limited here.

[0061] 2) Start the vacuum device to evacuate the magnesium smelting furnace and the magnesium vapor collecting device to a preset value.

[0062] The preset value of vacuuming can be 800Pa-1000Pa, for example, 800Pa, 850Pa, 900Pa, Pa, 950Pa or 1000Pa, etc. Crystallization in a vacuum environment can effectively reduce the occurrence of oxidation, ensure that a higher purity magnesium crystal is obtained, and reduce the evaporation of magnesium, which is conducive to the stable growth of crystals, and also helps to remove impurity gases in the crystal growth process and improve the crystal quality.

[0063] 3) Continuously add calcined white to the magnesium smelting furnace to a preset amount, the calcined white reacts with ferrosilicon, and the magnesium oxide is reduced to magnesium vapor and enters the magnesium vapor collection device.

[0064] Specifically, a plurality of water cooling coils are installed in the magnesium vapor collecting device. After the magnesium vapor contacts the magnesium water cooling coils in the magnesium vapor collecting device, the magnesium vapor condenses into crude magnesium on the water cooling coils.

[0065] 4) Air is introduced into the magnesium vapor collection system that has completed the collection of crude magnesium to balance the internal and external pressures, and then the upper tank body 3 is removed by a lifting device, and then the cooling coil 4 attached with the crude magnesium is removed from the lower tank body 5 by a lifting device.

[0066] 5) After the cooling coil 4 is removed, the cooling coil 4 is first dried and dehydrated to remove the cooling water in the pipeline, and then sent to the magnesium refining process for melting and refining.

[0067] In this embodiment, a plurality of magnesium vapor collecting devices are provided, and the plurality of magnesium vapor collecting devices are alternately connected to the magnesium smelting electric furnace.

[0068] Specifically, after the first magnesium vapor collecting device completes the collection, the magnesium vapor channel is switched to another magnesium vapor collecting device, and ferrosilicon and calcined white are continuously added to the magnesium smelting furnace to carry out a silicon thermal reduction reaction. By setting up multiple magnesium vapor collecting devices, the collection of magnesium vapor can be carried out continuously, which is beneficial to improving production efficiency. The specific number of magnesium vapor collecting devices can be adjusted according to the magnesium production capacity of the magnesium smelting furnace, and can be adapted to the magnesium smelting capacity of the magnesium smelting furnace, and is not limited here.

[0069] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0073] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0074] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A magnesium vapor collecting device, characterized in that: include: A collecting tank body, wherein the collecting tank body has a collecting cavity, and in a first direction of the collecting tank body, two ends of the collecting tank body are respectively provided with an air inlet and an air outlet connected with the collecting cavity, the air inlet is used to be connected with the magnesium vapor output port of the magnesium smelting device, and the air outlet is used to be connected with the vacuum device; The cooling coil is a magnesium cooling coil, the cooling coil has a cooling medium inlet and a cooling medium outlet, and the cooling coil is detachably arranged in the collecting chamber.

2. The magnesium vapor collecting device according to claim 1, characterized in that: A plurality of cooling coils are provided, and the plurality of cooling coils are arranged at intervals in the first direction.

3. The magnesium vapor collecting device according to claim 2, characterized in that: The plurality of cooling coils are divided into a plurality of rows, and the plurality of rows of cooling coils are sequentially distributed along a second direction perpendicular to the first direction.

4. The magnesium vapor collecting device according to claim 1, characterized in that: It also includes a first sealing member. The side wall of the collection tank body is provided with mounting holes corresponding to the cooling medium inlet and the cooling medium outlet. The cooling medium inlet and the cooling medium outlet are both sealed and connected to the mounting holes through the first sealing member.

5. The magnesium vapor collecting device according to claim 1, characterized in that: The flow channel of the cooling coil is S-shaped.

6. The magnesium vapor collecting device according to claim 1, characterized in that: The collecting tank body comprises an upper tank body and a lower tank body which are arranged up and down, and the upper tank body and the lower tank body are detachable and sealedly connected.

7. The magnesium vapor collecting device according to any one of claims 1 to 6, characterized in that: It also includes a vacuum gauge, which is arranged on the collection tank and is used to measure the vacuum degree in the collection chamber.

8. A method for using a magnesium vapor collection device, characterized in that: The magnesium vapor collecting device according to any one of claims 1 to 7, wherein the method for using the magnesium vapor collecting device comprises the following steps: Using the vacuum pumping device to evacuate the collection chamber and transport cooling medium into the cooling coil; delivering magnesium vapor to the air inlet; Introducing air into the collection tank to balance the internal and external air pressures; The cooling coil is removed from the collection tank.

9. A magnesium smelting system, characterized in that: The invention comprises a magnesium smelting electric furnace and a magnesium vapor collecting device according to any one of claims 1 to 7, wherein an air inlet of the magnesium vapor collecting device is connected to a magnesium vapor outlet of the magnesium smelting electric furnace.

10. The magnesium smelting system according to claim 9, characterized in that: A plurality of magnesium vapor collecting devices are provided, and the plurality of magnesium vapor collecting devices are alternately connected to the magnesium smelting electric furnace.

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