Vertical-retort reduction furnace for producing metal magnesium and method for producing metal magnesium

Abstract

The present invention relates to a vertical-retort reduction furnace for producing metal magnesium, comprising: a furnace body defining a furnace chamber (2), and vertical retorts (6) arranged in the furnace chamber (2), wherein the vertical retorts (6) each comprise a hollow straight cylindrical retort body (6-3); the retort body (6-3) defines, in an upper portion, a first crystallizer chamber (6-7) for receiving a crystallizer (7), and defines a second chamber (6-8) located below the first crystallizer chamber (6-7); the vertical retorts (6) each are provided with a top opening (6-10) and a bottom opening (6-6); the diameter of the bottom opening (6-6) is equal to the diameter of the second chamber (6-8). The vertical-retort reduction furnace further comprises bin assemblies (10), wherein the bin assemblies (10) each comprise an upper bin (10-1) allowing for filling of a pellet material (8) and a lower bin (10-4) for slidably receiving the upper bin (10-1). The present invention also relates to a method for producing metal magnesium by using the vertical-retort reduction furnace.

Description

Vertical tank reduction furnace for producing metallic magnesium and method for producing metallic magnesium TECHNICAL FIELD

[0001] The present invention relates to the technical field of reduction furnace for producing metallic magnesium, more particularly to a vertical tank reduction furnace for producing metallic magnesium and a method for producing metallic magnesium. BACKGROUND

[0002] Magnesium is a chemically active alkaline earth metal. In industry, the smelting method of metallic magnesium includes thermal reduction method, electrolysis method, electric melting method, gas phase metallurgy method and solvent metallurgy method, among which the thermal reduction method is the main smelting method, and the thermal reduction method for smelting magnesium mainly refers to the Pidgeon method for smelting magnesium. The traditional Pidgeon method for smelting magnesium uses a horizontal tank reduction furnace, and the horizontal tank of the reduction furnace is horizontally placed inside the furnace chamber. During production, the balling material is added into the horizontal tank, and then the balling material is reduced at a temperature of 1200℃. After the reduction reaction is completed, the crystallizer is taken out, and then the slag inside the horizontal tank needs to be removed. Since the horizontal tank can only be manually raked, the continuity of the horizontal tank production is extremely poor. Due to the influence of high temperature and dust, the slagging operation environment is very poor. In addition, due to the influence of high temperature environment for a long time, when the horizontal tank has a large span, it is easy to appear downward bending deformation. Therefore, the structure of the horizontal tank not only affects the service life of the tank body, but also is not conducive to the large-scale development of the tank body and the improvement of the production capacity of the equipment.

[0003] The vertical tank reduction furnace solves the above problems of the horizontal tank reduction furnace, and has been successfully applied in industrial production. The existing vertical tank reduction furnace is shown in FIGS. 1-3. The vertical tank 6 is composed of an upper vacuumizing device 6-1, a cooling water jacket 6-2, a tank body 6-3, a lower variable-diameter port 6-4 and a slag outlet 6-5. A center pipe 9 is located inside the vertical tank 6. During charging, the balling material 8 is loaded in the space between the vertical tank 6 and the center pipe 9 using a crown block. High-temperature flue gas and dust overflow from the upper part of the vertical tank 6 in a large, rapid and unorganized manner. During discharging, the center pipe 9 is lifted using the crown block, and the slag outlet 6-5 is opened at the same time. The slag flows downward, and at this time, high-temperature flue gas and dust overflow from the upper part of the vertical tank 6 in a large, rapid and unorganized manner. The above charging and discharging operations deteriorate the workshop operation environment. In addition, due to the adhesion of the slag in the high-temperature state between the vertical tank 6 and the center pipe 9, the center pipe 9 cannot be pulled out. Therefore, the vertical tank 6, the center pipe 9 and the slag need to be lifted out, and new vertical tank 6 and center pipe 9 need to be replaced. This not only affects the production continuity of the vertical tank reduction furnace, but also shortens the service life of the vertical tank.

[0004] On the other hand, when the center pipe 9 is lifted out for slagging, high-temperature flue gas and dust overflow from the upper part due to the inability to close the furnace cover at the top of the vertical tank. At the same time, during charging, the material falls into the vertical tank, and high-temperature flue gas and dust also overflow from the upper part. The production operation environment of the workshop is poor. Due to the complex structure of the furnace top and the existence of the crown block operation, there is no condition for collecting and treating flue gas and dust. SUMMARY

[0005] In view of the above-mentioned shortcomings of the prior art, the present application provides a vertical tank reduction furnace for producing metallic magnesium, which solves the problem of unorganized emission of workshop flue gas and dust during charging and discharging of the vertical tank reduction furnace by setting the bottom of the vertical tank as a bottom opening structure with a diameter equal to the inner diameter of the vertical tank, and cooperating with a liftable stock bin assembly, thereby improving the production continuity and stability of the vertical tank reduction furnace, and greatly improving the working environment.

[0006] According to one aspect, the present application provides a vertical tank reduction furnace for producing metallic magnesium, which comprises a furnace body defining a hearth, and a vertical tank arranged in the hearth. The vertical tank comprises a hollow straight cylindrical tank body defining a first crystallizer chamber for receiving a crystallizer in an upper portion, and a second chamber located below the first crystallizer chamber, the vertical tank being provided with a top opening and a bottom opening, the diameter of the bottom opening being equal to the diameter of the second chamber. The vertical tank reduction furnace further comprises a stock bin assembly, which comprises an upper bin body for filling pellet material and a lower bin body slidably receiving the upper bin body, both the upper bin body and the lower bin body being hollow straight cylinders, the outer diameter of the upper bin body being smaller than the inner diameter of the lower bin body and the diameter of the second chamber, and the inner diameter of the lower bin body being equal to the diameter of the second chamber, so that the upper bin body can be slidably moved up and down relative to the lower bin body between a first position and a second position, in the first position, the upper bin body is located in the second chamber of the vertical tank, and in the second position, the upper bin body is located in the lower bin body.

[0007] In one example, the bottom of the upper bin body is provided with a base, which is sealingly arranged in the lower bin body.

[0008] In one example, the upper bin body is provided with a base neck above the base, the base neck being recessed radially inward from the outer periphery of the upper bin body around the longitudinal axis of the upper bin body to form an annular groove for receiving a sealing ring for sealing between the upper bin body and the vertical tank or the lower bin body.

[0009] In one example, the vertical tank reduction furnace further comprises a pad arranged at the bottom of the inner side of the upper bin body, the pad being provided with a circular groove recessed from the upper surface of the pad, the diameter of the circular groove matching the outer diameter of the central pipe, for placing the central pipe to prevent direct contact between the central pipe and the bottom of the upper bin body.

[0010] In one example, the base is a hollow structure.

[0011] In one example, the first crystallizer chamber has a diameter smaller than the diameter of the second chamber, thereby forming a shoulder between the first crystallizer chamber and the second chamber for supporting the crystallizer.

[0012] In one example, the upper bin body is moved up and down relative to the lower bin body by a pneumatic lifting device.

[0013] In one example, the bin assembly is transported between the loading and discharging position and the working position directly below the shaft by a track mechanism.

[0014] According to another aspect, a method for producing magnesium metal using the shaft reduction furnace described above is provided, comprising: step S01, placing a sealing ring in the annular groove of the base neck, assembling the upper bin body inside the lower bin body, and placing the assembled bin assembly at the loading and discharging position; step S02, placing the center pipe in the circular groove of the pad, assembling the center pipe together with the pad inside the upper bin body of the bin assembly at the loading and discharging position, and filling the pellet material in the space between the upper bin body and the center pipe; step S03, placing the crystallizer on the shoulder of the shaft, and using the furnace cover to close the top opening of the shaft; step S04, transporting the bin assembly with the prepared material to the working position directly below the shaft by the track mechanism, using the pneumatic lifting device to raise the upper bin body to the first position, in which the upper bin body is inside the shaft, the pellet material is in the hearth, and the base is at the bottom wall of the furnace body, and the shaft reduction furnace enters the production cycle; and step S05, after the production cycle ends, opening the furnace cover at the top of the shaft to take out the crystallizer, using the pneumatic lifting device to lower the upper bin body from inside the shaft to the second position, in which the upper bin body is in the lower bin body, transporting the bin assembly to the loading and discharging position by the track mechanism, and performing the discharging operation under closed conditions.

[0015] In one example, during the production cycle, the vacuum device is started to vacuum the shaft and the crystallizer to the working vacuum degree; the shaft is heated to the working temperature, so that the reduction reaction occurs to form magnesium vapor, which rises into the crystallizer, crystallizes in the crystallizer, and condenses on the inner wall of the crystallizer.

[0016] The vertical tank reduction furnace for metal magnesium according to the present application realizes charging and discharging by setting the bottom of the vertical tank as a bottom opening with a diameter equal to the inner diameter of the vertical tank and cooperating with the lifting of the upper bin body of the bin assembly, the charging and discharging process is short, no dust is generated, the production continuity and stability of the vertical tank reduction furnace are improved, the working environment can be greatly improved, the materials are concentrated before charging, and the materials can be concentrated after discharging, the problem of unorganized emission of smoke and dust in the workshop during charging and discharging of the existing vertical tank reduction furnace is solved, the high-temperature materials during discharging can be reused by using a waste heat recovery device during the concentrated discharging, the center pipe is prevented from directly contacting the bottom of the upper bin body by setting a fiber pad, and the problem of adhesion of the center pipe is avoided.

[0017] Other applications of the present disclosure will become apparent from the detailed description, claims, and drawings. The detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present disclosure will be more fully understood from the detailed description and the accompanying drawings.

[0019] Fig. 1 is a structural schematic diagram of an existing vertical tank reduction furnace.

[0020] Fig. 2 is a structural schematic diagram of a vertical tank of an existing vertical tank reduction furnace.

[0021] Fig. 3 is a structural schematic diagram of a center pipe of an existing vertical tank reduction furnace.

[0022] Fig. 4 is a structural schematic diagram of a vertical tank reduction furnace according to the present application.

[0023] Fig. 5 is a structural schematic diagram of a vertical tank of a vertical tank reduction furnace according to the present application.

[0024] Fig. 6 is a structural schematic diagram of a bin assembly of a vertical tank reduction furnace according to the present application, in which the upper bin body is located at a first position.

[0025] Fig. 7 is a structural schematic diagram of a bin assembly of a vertical tank reduction furnace according to the present application, in which the upper bin body is located at a position between the first position and a second position.

[0026] Fig. 8 is a sectional view of a pad of a vertical tank reduction furnace according to the present application.

[0027] Fig. 9 is a flowchart of a method for producing metal magnesium according to the present application. DETAILED DESCRIPTION

[0028] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features. Furthermore, the drawings are generally schematic and are not necessarily drawn to scale. Some features can be exaggerated or minimized to show specific details. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present disclosure.

[0029] Certain terminology can be used in the following description for the purpose of reference only, and thus is not intended to be limiting. For example, terms such as "above" and "below" refer to directions in the drawings to which reference is made. Terms such as "front," "back," "rear," "side," "up," "down," "top," and "bottom" as well as derivatives thereof (e.g., "vertical," "horizontal," "horizontal," "vertical section," "upwardly," "downwardly," etc.) should be construed to refer to the orientation as then described or as shown in the drawing under discussion. The terminology includes the words specifically mentioned above, derivatives thereof, and words of similar import.

[0030] Additionally, terminology of the type used for the purpose of clarity in the specification and concluding remarks may include the use of terms such as "first", "second", "third", etc. Such terminology may be used for the purpose of distinguishing between similar items or to refer to a specific one or ones of a group. It is further noted that like reference numerals are used throughout the disclosure for like elements, features, and structures.

[0031] Referring now to the drawings, FIG. 4 is a schematic view of the structure of a vertical retort reduction furnace according to the present application. As shown in FIG. 4, the vertical retort reduction furnace includes a furnace body defining a furnace chamber 2 and a vertical retort 6 arranged in the furnace chamber 2. According to one example, the furnace body includes a furnace roof 1, furnace heads 3 located on both sides of the furnace chamber 2, and a bottom wall 5. It should be understood that the furnace body adopts any other suitable structure without departing from the scope of the present application. The furnace heads 3 are provided with a plurality of regenerative burners 4. The bottom wall 5 is fixedly connected to a steel column 11 at the bottom. The vertical retort 6 is internally provided with a crystallizer 7, and the upper portion of the vertical retort 6 is provided with a vacuumizing device 6-1 and a cooling water jacket 6-2.

[0032] Figure 5 is a schematic view of the vertical shaft 6 of the vertical shaft reduction furnace according to the present application. As shown in Figure 5, the vertical shaft 6 comprises a hollow straight cylindrical shaft body 6-3 having a bottom portion which is a bottom opening 6-6 having the same inner diameter as the upper shaft body. The vertical shaft reduction furnace further comprises a bin assembly 10 comprising an upper bin body 10-1 and a lower bin body 10-4 which are straight cylindrical. The upper bin body 10-1 is provided with a base 10-3 which is sealingly arranged within the lower bin body 10-4. The lower bin body 10-4 is fitted outside the upper bin body 10-1 and the base 10-3, and the upper bin body 10-1 and the base 10-3 are movable in a lifting manner relative to the lower bin body 10-4, and the outer diameter of the upper bin body 10-1 is smaller than the inner diameter of the vertical shaft 6. The furnace top 1 is provided with a first opening for mounting the vertical shaft 6. The bottom wall 5 is provided with a second opening. As shown in Figure 4, the second opening is in a three-step ladder shape, the diameters of the upper portion and the lower portion are larger than the diameter of the middle portion, the upper portion is used for positioning the vertical shaft 6, the middle portion is used for positioning the base 10-3, and the lower portion is used for positioning the lower bin body 10-4.

[0033] According to one example, the shaft body 6-3 defines a first crystallizer chamber 6-7 in the upper portion for receiving the crystallizer 7, and defines a second chamber 6-8 below the first crystallizer chamber 6-7, and the vertical shaft 6 is provided with a top opening 6-10 and a bottom opening 6-6 having a diameter equal to the diameter of the second chamber 6-8.

[0034] Figure 6 is a schematic view of the bin assembly 10 of the vertical shaft reduction furnace according to the present application, wherein the upper bin body 10-1 is in a first position. Figure 7 is a schematic view of the bin assembly 10 of the vertical shaft reduction furnace according to the present application, wherein the upper bin body 10-1 is in a position between the first position and a second position. According to one example, the upper bin body 10-1 and the lower bin body 10-4 are both hollow straight cylindrical, the outer diameter of the upper bin body 10-1 is smaller than the inner diameter of the lower bin body 10-4 and the diameter of the second chamber 6-8, and the inner diameter of the lower bin body 10-4 is equal to the diameter of the second chamber 6-8, so that the upper bin body 10-1 is slidably movable in a lifting manner relative to the lower bin body 10-4 between the first position shown in Figure 6 and the second position shown in Figure 7, in the first position, the upper bin body 10-1 is positioned within the second chamber 6-8 of the vertical shaft 6, and in the second position, the upper bin body 10-1 is positioned within the lower bin body 10-4. According to one example, the outer diameter of the upper bin body 10-1 is 90%-98% of the inner diameter of the lower bin body 10-4. According to one example, the outer diameter of the upper bin body 10-1 is 95% of the inner diameter of the lower bin body 10-4. It should be understood that the outer diameter of the upper bin body 10-1 can take any other suitable value without departing from the scope of the present application.

[0035] The base 10-3 is sealed with the lower bin body 10-4, and the upper bin body 10-1 can be lifted and moved relative to the lower bin body 10-4 by a pneumatic lifting device. The pneumatic lifting device inflates or deflates the lower bin body 10-4, so that the upper bin body 10-1 is lifted or lowered. The state of the upper bin body 10-1 when it is lifted is shown in FIG. 6, and the state of the upper bin body 10-1 when it is lowered is shown in FIG. 7. According to an example, the upper bin body 10-1 is provided with a base neck 10-2 above the base 10-3, and the base neck 10-2 is recessed radially inward from the outer periphery of the upper bin body 10-1 around the longitudinal axis of the upper bin body 10-1 to form an annular groove 10-5 for receiving a sealing ring 13. The sealing ring 13 seals between the upper bin body 10-1 and the vertical tank 6 or the lower bin body 10-4 to reduce the loss of heat inside the vertical tank 6. According to an example, the base 10-3 can be a hollow structure to reduce the weight and manufacturing cost of the base 10-3 while ensuring its basic strength. The sealing ring 13 can be formed of any suitable material, such as a polymer, a fiber, etc.

[0036] A center tube 9 is arranged inside the upper bin body 10-1, as shown in FIG. 3, which includes a tube body 9-2 provided with a magnesium vapor escape port 9-1. The outer wall of the center tube 9 is filled with pellets 8 between the inner wall of the upper bin body 10-1. In order to limit the center tube 9 inside the upper bin body 10-1 and facilitate the separation of the center tube 9 from the upper bin body 10-1 after production, the inner side of the upper bin body 10-1 is provided with a pad 12 with a circular groove 12-1 at the bottom, and the diameter of the circular groove 12-1 matches the diameter of the center tube 9. When the center tube 9 is placed inside the upper bin body 10-1, the bottom of the center tube 9 is placed in the circular groove 12-1 of the fiber pad 12.

[0037] FIG. 8 is a sectional view of the pad 12 of the vertical tank reduction furnace according to the present application. The pad 12 is arranged at the bottom of the inner side of the upper bin body 10-1, and the pad 12 is provided with a circular groove 12-1 recessed from the upper surface of the pad 12, and the diameter of the circular groove 12-1 matches the outer diameter of the center tube 9 for placing the center tube 9 to prevent direct contact between the center tube 9 and the bottom of the upper bin body 10-1. The pad 12 can be formed of any suitable material, such as a polymer, a fiber, etc.

[0038] According to an example, as shown in FIG. 5, the diameter of the first crystallizer chamber 6-7 is smaller than the diameter of the second chamber 6-8, thereby forming a shoulder 6-9 between the first crystallizer chamber 6-7 and the second chamber 6-8 for supporting the crystallizer 7.

[0039] According to an example, the bin assembly 10 is transported between the loading and unloading position and the working position directly below the vertical tank 6 by a track mechanism 14.

[0040] Figure 9 is a flow chart of a method for producing metallic magnesium according to the present application. As shown in Figure 9, the method comprises the following steps:

[0041] Step S01: A fiber sealing ring 13 is arranged in the annular groove of the base neck 10-2, the upper bin body 10-1 is assembled inside the lower bin body 10-4, and the assembled bin assembly 10 is placed at the charging and discharging position.

[0042] Step S02: The center pipe 9 is placed in the circular groove 12-1 of the pad 12, the center pipe 9 together with the pad 12 is loaded into the inside of the upper bin body 10-1 of the bin assembly 10 at the charging and discharging position, and the pellet material 8 is filled in the space between the upper bin body 10-2 and the center pipe 9.

[0043] Step S03: The crystallizer 7 is placed on the shoulder 6-9 of the shaft 6, and the top opening 6-10 of the shaft 6 is closed by using the furnace cover 21.

[0044] Step S04: The bin assembly 10 after preparation is transported to the working position directly below the shaft 6 by the track mechanism 14, the pneumatic lifting device is used to raise the upper bin body 10-2 to the first position, in which the upper bin body 10-2 is located inside the shaft 6, the pellet material 8 is located in the hearth 2, and the base 10-3 is placed at the bottom wall 5 of the furnace body, and the shaft reduction furnace enters the production cycle. During the production cycle, the vacuum device is started to vacuum the shaft 6 and the crystallizer 7 to the working vacuum degree; the shaft 6 is heated to the working temperature, so that the reduction reaction occurs to form magnesium vapor, which passes through the escape port 9-1 of the center pipe 9 and rises along the pipe body 9-2 of the center pipe 9 to the crystallizer 7 or directly rises to the crystallizer 7 through the pellet material 8, crystallizes in the crystallizer 7, and condenses on the inner wall of the crystallizer 7.

[0045] Step S05: After the production cycle ends, the furnace cover 21 at the top of the shaft 6 is opened, and the crystallizer 7 is taken out; the pneumatic lifting device is used to lower the upper bin body 10-2 from inside the shaft 6 to the second position, in which the upper bin body 10-2 is located in the lower bin body 10-4; the bin assembly 10 is transported to the charging and discharging position by the track mechanism 14, and the discharging operation under closed conditions is performed.

[0046] The vertical tank reduction furnace of the present application realizes charging and discharging operation by setting the bottom of the vertical tank 6 as a bottom opening 6-6 with a diameter equal to the inner diameter of the vertical tank and cooperating with the lifting of the upper bin body 10-1 of the bin assembly 10, the charging and discharging process is short, no dust is generated, the production continuity and stability of the vertical tank reduction furnace are improved, and the working environment can be greatly improved. The charging and discharging operation is concentrated in a specific workshop, and the high-temperature material during discharging can be recycled by using a waste heat recovery device during centralized discharging. By setting the fiber pad 12, direct contact between the center pipe 9 and the bottom of the upper bin body 10-1 is prevented, and the problem of adhesion of the center pipe 9 is avoided.

[0047] Aspects of the disclosure have been described in detail with reference to the illustrated embodiments; however, it will be appreciated that various modifications can be made without departing from the scope of the disclosure. The present disclosure is not limited to the precise construction and composition disclosed herein; any and all modifications, changes, and variations that are evident from the foregoing description are within the scope of the present disclosure as defined in the appended claims. Moreover, the present concept expressly includes any and all combinations and subcombinations of the foregoing elements and features.

[0048] LIST OF REFERENCE NUMERALS: 1 furnace top; 2 furnace chamber; 3 furnace head; 4 regenerative burner; 5 bottom wall; 6 vertical tank; 6-1 vacuumizing device; 6-2 cooling water jacket; 6-3 tank body; 6-4 lower reducing port; 6-5 slagging port; 6-6 bottom opening; 6-7 first crystallizer chamber; 6-8 second chamber; 6-9 shoulder; 6-10 top opening; 7 crystallizer; 8 pellet material; 9 center pipe; 9-1 escape port; 9-2 pipe body; 10 bin assembly; 10-1 upper bin body; 10-2 base neck; 10-3 base; 10-4 lower bin body; 10-5 annular groove; 11 stand column; 12 pad; 12-1 circular groove; 13 sealing ring; 14 track mechanism; 21 furnace cover.

Claims

1. A vertical reduction furnace for producing metallic magnesium, comprising: The furnace body that defines the furnace chamber (2); as well as Vertical tank (6) arranged inside the furnace (2); The vertical tank (6) includes a hollow cylindrical tank body (6-3), the tank body (6-3) defines a first crystallizer chamber (6-7) for receiving a crystallizer (7) in its upper part, and defines a second chamber (6-8) located below the first crystallizer chamber (6-7). The vertical tank (6) is provided with a top opening (6-10) and a bottom opening (6-6), the diameter of which is equal to the diameter of the second chamber (6-8). The vertical reduction furnace also includes a hopper assembly (10), which includes an upper hopper (10-1) for filling pellets (8) and a lower hopper (10-4) that can slidably receive the upper hopper (10-1). Both the upper hopper (10-1) and the lower hopper (10-4) are hollow cylindrical. The outer diameter of the upper hopper (10-1) is smaller than the inner diameter of the lower hopper (10-4) and the second chamber (6). The diameter of the lower compartment (10-4) is equal to the diameter of the second chamber (6-8), so that the upper compartment (10-1) can slide up and down relative to the lower compartment (10-4) between a first position and a second position. In the first position, the upper compartment (10-1) is located in the second chamber (6-8) of the vertical tank (6), and in the second position, the upper compartment (10-1) is located in the lower compartment (10-4).

2. The vertical reduction furnace for producing metallic magnesium according to claim 1, characterized in that: The bottom of the upper compartment (10-1) is provided with a base (10-3), which is sealed inside the lower compartment (10-4).

3. The vertical reduction furnace for producing metallic magnesium according to claim 2, characterized in that: The upper compartment (10-1) has a base neck (10-2) above the base (10-3). The base neck (10-2) is recessed radially inward from the outer periphery of the upper compartment (10-1) around the longitudinal axis of the upper compartment (10-1) to form an annular groove (10-5) for receiving a sealing ring (13). The sealing ring (13) seals between the upper compartment (10-1) and the vertical tank (6) or the lower compartment (10-4).

4. The vertical reduction furnace for producing metallic magnesium according to claim 3, characterized in that: The vertical reduction furnace also includes a pad (12) arranged at the bottom of the inner side of the upper chamber (10-1). The pad (12) is provided with a circular groove (12-1) recessed from the upper surface of the pad (12). The diameter of the circular groove (12-1) matches the outer diameter of the central tube (9) and is used to place the central tube (9) to prevent direct contact between the central tube (9) and the bottom of the upper chamber (10-1).

5. The vertical reduction furnace for producing metallic magnesium according to claim 3, characterized in that: The base (10-3) has a hollow structure.

6. The vertical reduction furnace for producing metallic magnesium according to claim 3, characterized in that: The diameter of the first crystallizer chamber (6-7) is smaller than the diameter of the second chamber (6-8), thereby forming a shoulder (6-9) between the first crystallizer chamber (6-7) and the second chamber (6-8) for supporting the crystallizer (7).

7. The vertical reduction furnace for producing metallic magnesium according to claim 1, characterized in that: The upper compartment (10-1) moves up and down relative to the lower compartment (10-4) via a pneumatic lifting device.

8. The vertical reduction furnace for producing metallic magnesium according to claim 1, characterized in that: The hopper assembly (10) is transported between the loading and unloading position and the working position directly below the vertical tank (6) via a track mechanism (14).

9. A method for producing metallic magnesium using a vertical reduction furnace according to claim 1, comprising: Step S01: Set a sealing ring (13) in the annular groove (10-5) of the base neck (10-2), assemble the upper hopper (10-1) inside the lower hopper (10-4), and place the assembled hopper assembly (10) at the loading and unloading position. Step S02: Place the central tube (9) in the circular groove (12-1) of the pad (12), and insert the central tube (9) together with the pad (12) into the upper hopper (10-1) of the hopper assembly (10) located at the material loading and unloading position, and fill the space between the upper hopper (10-2) and the central tube (9) with pellet material (8); Step S03: Place the crystallizer (7) on the shoulder (6-9) of the vertical tank (6) and seal the top opening (6-10) of the vertical tank (6) with the furnace cover (21); Step S04: The prepared silo assembly (10) is transported to the working position directly below the vertical tank (6) via the track mechanism (14). The upper silo (10-2) is raised to the first position using a pneumatic lifting device. In the first position, the upper silo (10-2) is located inside the vertical tank (6), so that the pellet material (8) is located inside the furnace (2), and the base (10-3) is placed on the bottom wall (5) of the furnace body. The vertical tank reduction furnace enters the production cycle; and Step S05: After the production cycle is completed, open the furnace cover (21) on the top of the vertical tank (6) and take out the crystallizer (7); use a pneumatic lifting device to lower the upper hopper (10-2) from inside the vertical tank (6) to the second position, in which the upper hopper (10-2) is located in the lower hopper (10-4); transport the hopper assembly (10) to the loading and unloading position through the track mechanism (14) to carry out the unloading operation under closed conditions.

10. The method for producing metallic magnesium according to claim 9, characterized in that: During the production cycle, the vacuum device is activated to evacuate the vertical tank (6) and crystallizer (7) to the working vacuum level; the vertical tank (6) is heated to the working temperature so that a reduction reaction occurs to form magnesium vapor, which rises into the crystallizer (7), crystallizes in the crystallizer (7), and condenses on the inner wall of the crystallizer (7).

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