Condensing device for collecting magnesium steam in magnesium metal production

Abstract

The utility model provides a condensing device for collecting magnesium steam in magnesium metal production, which belongs to the technical field of magnesium metal smelting and comprises a crystallization barrel, a crystallization water jacket, a vacuum pipeline and a cooling water pipeline. The crystal water jacket comprises a connecting cylinder, a jacket inner cylinder and a jacket outer cylinder; a closed water cooling chamber is defined by the jacket outer cylinder and the jacket inner cylinder; the small-caliber end of the connecting cylinder is connected with the tank opening of the reduction tank, and the large-caliber end is connected with the small-caliber end of the jacket inner cylinder; the crystallization barrel is contained in the crystallization water jacket, and the large-caliber end of the crystallization barrel is in seamless butt joint with the joint of the connecting barrel and the jacket inner barrel; the vacuum pipeline penetrates through the crystallization water jacket and is communicated with the interior of the jacket inner cylinder; the cooling water pipeline comprises a water inlet pipe and a water outlet pipe which are communicated with the water cooling chamber. A channel partition plate is arranged between the water inlet pipe and the water outlet pipe. The device is simple in structure and good in condensation effect, the phenomena of false vacuum, flow burning, clamping and the like are avoided, the condensation efficiency and the production efficiency are remarkably improved, and the service life of the device is also prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of magnesium smelting, in particular to a condensation device for collecting magnesium vapor in magnesium production. Background Art

[0002] In the silicon thermal process for magnesium smelting, dolomite (CaCO3·MgCO3) is used as the raw material. The product after calcination is commonly known as "calcined dolomite (CaO·MgO)", which is mixed with the reducing agent ferrosilicon (Fe-Si) and the mineralizer fluorite powder (CaF2) in a set ratio, ground into powder, pelletized, and placed in a container (reduction tank) made of heat-resistant alloy steel. Under high temperature (1200°C) and vacuum (10 Pa) conditions, a chemical reaction [2(CaO·MgO) + Si = 2Mg + 2CaO·SiO2] occurs to obtain magnesium vapor. The magnesium vapor condenses and crystallizes into solid magnesium in a condensation device (i.e., the reduction tank water jacket crystallizer), and then is melted and cast into ingots.

[0003] In the existing magnesium vapor condensation device, the magnesium vapor is mainly cooled and condensed through a crystallization water jacket. The crystallization cylinder needs to be taken out periodically, so the heat exchange form between it and the crystallization water jacket is mainly radiative heat transfer. Due to design defects, it is easy to cause premature or late crystallization of magnesium vapor in the condensation device, especially in the crystallization cylinder. Premature crystallization will cause the vacuum branch pipe to be blocked, resulting in a false vacuum in the reduction tank. After breaking the vacuum, large-area burning of crude magnesium is likely to occur. Late crystallization will cause a magnesium ring to form at the mouth of the reduction tank, making it difficult to take out magnesium and increasing the labor intensity of the operator. In addition, when the temperature at the mouth of the reduction tank is too high and exceeds the melting point of magnesium, it is easy to cause the magnesium ring at the mouth of the reduction tank to burn and flow, and the liquid magnesium will eventually bond the crystallization cylinder and the inner wall of the crystallization water jacket together, which is commonly known as "jamming the tank" in the industry. At the same time, the gap between the large end of the crystallization cylinder and the inner wall of the crystallization water jacket is filled and sealed with wet straw ropes to prevent magnesium vapor from crystallizing outside the crystallization cylinder. However, the high temperature of the reduction tank is likely to cause the straw ropes to fail and the sealing performance to be poor, unable to avoid the occurrence of external crystallization. External crystallization is likely to cause false vacuum, burning and flowing, and jamming phenomena in the reduction tank, resulting in reduced production and increased labor intensity and other negative impacts. Summary of the Utility Model

[0004] The utility model provides a condensation device for collecting magnesium vapor in magnesium production, which has a simple structure, remarkable condensation effect, and improved condensation efficiency and production efficiency, so as to solve the above technical problems.

[0005] The utility model provides a condensation device for collecting magnesium vapor in the production of metallic magnesium, comprising: a conical crystallization cylinder, a crystallization water jacket, a vacuum pipeline and a cooling water pipeline; the crystallization water jacket includes a connecting cylinder with a frustum of a cone structure, an inner jacket cylinder and an outer jacket cylinder, and the inner jacket cylinder and the outer jacket cylinder are conical cylinder structures arranged coaxially; the outer jacket cylinder is sleeved outside the inner jacket cylinder and encloses a sealed water-cooled chamber with the inner jacket cylinder; the small-diameter end of the connecting cylinder is connected to the tank mouth of the reduction tank, and the large-diameter end of the connecting cylinder is connected to the small-diameter end of the inner jacket cylinder.

[0006] Preferably, the crystallization cylinder is received inside the crystallization water jacket, and the large-diameter end of the crystallization cylinder is seamlessly butted against the connection part of the connecting cylinder and the inner jacket cylinder; a support frame is arranged outside the small-diameter end of the crystallization cylinder, the support frame is semi-circular ring-shaped, and the support frame abuts against the inner wall of the inner jacket cylinder; a water jacket flange is arranged at one end of the inner jacket cylinder far away from the reduction tank, and a sealing cover is connected to the water jacket flange.

[0007] Preferably, the vacuum pipeline is arranged on one side close to the water jacket flange, and one end penetrates through the crystallization water jacket and is communicated with the inside of the inner jacket cylinder, and the other end is connected to a vacuum pump; the cooling water pipeline includes a water inlet pipe and a water outlet pipe, both the water inlet pipe and the water outlet pipe penetrate through the outer jacket cylinder and are communicated with the water-cooled chamber, and a channel partition plate is arranged axially along the inner jacket cylinder between the water inlet pipe and the water outlet pipe.

[0008] Preferably, the connecting cylinder and the inner jacket cylinder are integrally formed by pressing seamless pipes; the outer jacket cylinder is formed by rolling and welding a steel plate outside the inner jacket cylinder; the crystallization cylinder is formed by pressing a seamless pipe.

[0009] Preferably, a positioning cylinder is further arranged in the connecting cylinder, the positioning cylinder is a conical cylinder structure, the large-diameter end of the positioning cylinder is connected to the inner wall of the connecting cylinder, the small-diameter end of the positioning cylinder is inserted into the crystallization cylinder and abuts against the inner wall of the crystallization cylinder.

[0010] Preferably, the side wall of the positioning cylinder is an inwardly concave arc, and the inner wall of the crystallization cylinder abuts against the edge of the arc-shaped side wall of the positioning cylinder.

[0011] Preferably, the wall thickness of the reduction tank is greater than the wall thicknesses of the connecting cylinder and the inner jacket cylinder.

[0012] Preferably, a fire-blocking component is further arranged at the connection part of the connecting cylinder and the reduction tank, the fire-blocking component includes a fixing plate and first heat-insulating plates and second heat-insulating plates arranged in a staggered manner up and down; a through hole is opened at the central position of the fixing plate, and the fixing plate is fixed to the tank mouth of the reduction tank; arc-shaped connecting pieces are respectively arranged on the upper and lower sides of the fixing plate, the connecting pieces extend towards the reduction tank and abut against the inner wall of the reduction tank; a first heat-insulating plate far away from the connecting cylinder is arranged on the lower connecting piece, and a second heat-insulating plate close to the connecting cylinder is arranged on the upper connecting piece; the first heat-insulating plate and the second heat-insulating plate are arranged in parallel.

[0013] Preferably, the first heat insulation plate is in the shape of a bow larger than a semi-circle with the chord facing upward; the second heat insulation plate has the same structure as the first heat insulation plate and the chord faces downward.

[0014] Preferably, a metal filter screen is arranged in the through hole on the fixing plate.

[0015] The condensation device for collecting magnesium vapor in the production of magnesium metal provided by the utility model, by setting the crystal water jacket into a double-cone structure and cooperating with the conical crystal cylinder, can achieve seamless docking between the crystal cylinder and the crystal water jacket through a simple structure, without using straw ropes, reducing the labor intensity of the operators, and also preventing phenomena such as crystallization outside the cylinder, false vacuum, burning and flowing, clamping, etc. The condensation effect is good, improving the usability and durability of the crystal cylinder, extending the replacement cycle of the crystal cylinder, reducing costs, significantly enhancing both the condensation efficiency and the production efficiency, and also extending the service life of the device.

[0016] The positioning cylinder in the condensation device can facilitate the installation and positioning of the crystal cylinder, and further prevent magnesium vapor from leaking from the large-diameter end of the crystal cylinder to form crystallization outside the cylinder. Through the fire-blocking component, the heat radiation loss in the reduction tank area can be reduced, and the heat insulation effect is significant, having a certain yield-increasing effect, helping to improve the output of a single tank, and also realizing the collision capture of particulate impurities in magnesium vapor, having a certain impurity-removing effect. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of a condensation device for collecting magnesium vapor in the production of magnesium metal provided by an embodiment;

[0019] Figure 2 It is a schematic structural diagram of the left side view of the crystal water jacket provided by an embodiment;

[0020] Figure 3 For Figure 1 The enlarged schematic diagram at A in

[0021] Figure 4 It is a schematic installation structure diagram of the fire-blocking component provided by an embodiment.

[0022] Explanation of the Reference Numerals in the Drawings:

[0023] 1 - Crystallization cylinder, 2 - Vacuum pipeline, 3 - Reduction tank, 11 - Support frame, 41 - Connecting cylinder, 42 - Inner jacket cylinder, 43 - Outer jacket cylinder, 44 - Water jacket flange, 45 - Sealing cover, 46 - Positioning cylinder, 51 - Water inlet pipe, 52 - Water outlet pipe, 53 - Channel partition plate, 61 - Fixed plate, 62 - First heat insulation plate, 63 - Second heat insulation plate, 64 - Connecting piece, 65 - Metal filter screen. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be described clearly and completely below. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts also belong to the scope of protection of the present utility model.

[0025] As Figure 1 , a condensation device for collecting magnesium vapor in the production of metallic magnesium provided by the present utility model includes: a conical crystallization cylinder 1, a crystallization water jacket, a vacuum pipeline 2 and a cooling water pipeline; the crystallization water jacket includes a connecting cylinder 41 with a frustum of a cone structure, an inner jacket cylinder 42 and an outer jacket cylinder 43. The inner jacket cylinder 42 and the outer jacket cylinder 43 are coaxially arranged conical cylinder structures; the outer jacket cylinder 43 is sleeved outside the inner jacket cylinder 42 and encloses a closed water cooling chamber with the inner jacket cylinder 42; the small-diameter end of the connecting cylinder 41 is connected to the tank opening of the reduction tank 3, and the large-diameter end of the connecting cylinder 41 is connected to the small-diameter end of the inner jacket cylinder 42.

[0026] As Figure 1 , preferably, the crystallization cylinder 1 is received inside the crystallization water jacket, and the large-diameter end of the crystallization cylinder 1 is seamlessly butted with the connection part of the connecting cylinder 41 and the inner jacket cylinder 42; a support frame 11 is provided outside the small-diameter end of the crystallization cylinder 1. The support frame 11 is semi-circular and abuts against the inner wall of the inner jacket cylinder 42; a water jacket flange 44 is provided at the end of the inner jacket cylinder 42 far from the reduction tank 3, and a sealing cover 45 is connected to the water jacket flange 44.

[0027] As Figure 1 and Figure 2 , preferably, the vacuum pipeline 2 is arranged on one side close to the water jacket flange 44, and one end penetrates through the crystallization water jacket and is communicated with the inside of the inner jacket cylinder 42, and the other end is connected to a vacuum pump; the cooling water pipeline includes a water inlet pipe 51 and a water outlet pipe 52. The water inlet pipe 51 and the water outlet pipe 52 both penetrate through the outer jacket cylinder 43 and are communicated with the water cooling chamber. A channel partition plate 53 is arranged axially along the inner jacket cylinder 42 between the water inlet pipe 51 and the water outlet pipe 52.

[0028] In the production of metallic magnesium, the reduction tank 3 is connected to the condensation device. After putting the pellet material into the reduction tank 3, the crystallization cylinder 1 is placed. After the placement is completed, the sealing cover 45 is hermetically connected to the water jacket flange 44. The reduction tank 3 is evacuated through the vacuum pipeline 2 connected to the vacuum pump, and the reduction tank 3 is heated. The pellet material generates magnesium vapor when heated, and the magnesium vapor enters the crystallization cylinder 1 along the air extraction direction of the vacuum pipeline 2. Since the outside of the crystallization cylinder 1 is surrounded by a crystallization water jacket for cooling, the magnesium vapor is cooled and solidified when it meets the crystallization cylinder 1. After the production is completed, the reduction tank 3 is pressurized to pressure balance, the sealing cover 45 is opened, the crystallization cylinder 1 is taken out, and the crystalline magnesium on the crystallization cylinder 1 is collected. This device has a simple structure, does not require the use of straw ropes, has good condensation effect, avoids phenomena such as false vacuum, burning flow, and clamping, significantly improves the condensation efficiency and production efficiency, and also extends the service life of the device.

[0029] A connecting cylinder 41 is arranged between the mouth of the reduction tank 3 and the inner cylinder 42 of the jacket, so that there is a certain distance between the crystallization cylinder 1 and the reduction tank 3, and the mutual interference of the temperatures between the two is small, which can avoid the crystallization cylinder 1 being affected by the temperature in the reduction tank 3 and resulting in difficult cooling of the crystallization cylinder 1 and secondary evaporation or ignition of the crystalline magnesium crystallization, making the crystallization ability of the crystallization cylinder 1 stable. The connecting cylinder 41 is usually welded to the mouth of the reduction tank 3 with M407 welding material, and both the water jacket flange 44 and the sealing cover 45 adopt the existing flange structure. The water jacket flange 44 is only connected to the inner cylinder 42 of the jacket and does not connect to the outer cylinder 43 of the jacket, which can avoid the problem that the water jacket flange 44 is deformed and affects the sealing performance of the crystallization water jacket. A channel partition 53 is arranged in the water-cooling chamber of the crystallization water jacket, so that the water inlet pipe 51 and the water outlet pipe 52 are respectively placed on both sides of the channel partition 53, which can avoid the formation of a circulating water short circuit in the crystallization water jacket, enhance the cooling effect, and is not easily blocked due to scaling. The small-diameter end of the crystallization cylinder 1 is supported by the support frame 11 to ensure that the axis of the crystallization cylinder 1 coincides with the axis of the inner cylinder 42 of the jacket, increasing the stability strength of the crystallization cylinder 1 and also facilitating its installation and removal. The crystallization cylinder 1 supported by the support frame 11, combined with the seamless butt joint at the connection between the large-diameter end of the crystallization cylinder 1 and the connecting cylinder 41 and the inner cylinder 42 of the jacket, can form a seal through conical connection to avoid the formation of crystals outside the crystallization cylinder 1.

[0030] Preferably, the connecting cylinder 41 and the inner cylinder 42 of the jacket are integrally formed by pressing seamless pipes; the outer cylinder 43 of the jacket is formed by rolling and welding a steel plate on the outside of the inner cylinder 42 of the jacket; the crystallization cylinder 1 is formed by pressing seamless pipes. The integral forming of the connecting cylinder 41 and the inner cylinder 42 of the jacket, and the integral forming of the crystallization cylinder 1 can ensure its sealing performance and avoid potential safety hazards caused by the leakage of magnesium vapor. The crystallization cylinder 1, the crystallization water jacket, etc. can all be made of commonly used materials in the prior art in this field, and the length is designed according to the production and processing volume.

[0031] As Figure 3, preferably, a positioning cylinder 46 is further provided in the connecting cylinder 41. The positioning cylinder 46 is in a conical cylinder structure. The large-diameter end of the positioning cylinder 46 is connected to the inner wall of the connecting cylinder 41, and the small-diameter end of the positioning cylinder 46 is inserted into the crystallization cylinder 1 and abuts against the inner wall of the crystallization cylinder 1. The positioning cylinder 46 can block the connection between the crystallization cylinder 1 and the connecting cylinder 41, further avoiding the leakage of magnesium vapor from the large-diameter end of the crystallization cylinder 1 to form crystallization outside the cylinder. At the same time, the positioning cylinder 46 can also facilitate the installation and positioning of the crystallization cylinder 1 and improve the installation efficiency. The connection mode between the positioning cylinder 46 and the connecting cylinder 41 can be welding or detachable connection through fixing parts such as bolts.

[0032] Such as Figure 3 , preferably, the side wall of the positioning cylinder 46 is an inwardly concave arc, and the inner wall of the crystallization cylinder 1 abuts against the edge of the arc-shaped side wall of the positioning cylinder 46. The arc-shaped side wall has better sliding performance, which is convenient for installation. Moreover, compared with the straight side wall, the arc-shaped side wall can also prevent the crystallization cylinder 1 from being stuck and difficult to pull out due to crystallization at the connection.

[0033] In order to enhance the heat exchange effect of the crystallization water jacket, preferably, the wall thickness of the reduction tank 3 is greater than the wall thicknesses of the connecting cylinder 41 and the inner cylinder 42 of the jacket. The wall thickness of the inner cylinder 42 of the jacket is smaller, which is convenient for the heat exchange between the crystallization water jacket and the crystallization cylinder 1 and can improve the condensation effect of the crystallization cylinder 1.

[0034] Such as Figure 4 , preferably, a fire-blocking assembly is further provided at the connection between the connecting cylinder 41 and the reduction tank 3. The fire-blocking assembly includes a fixing plate 61 and first heat-insulating plates 62 and second heat-insulating plates 63 arranged alternately up and down; a through hole is provided at the center of the fixing plate 61, and the fixing plate 61 is fixed at the tank opening of the reduction tank 3; arc-shaped connecting pieces 64 are respectively provided on the upper and lower sides of the fixing plate 61, and the connecting pieces 64 extend towards the reduction tank 3 and abut against the inner wall of the reduction tank 3; the first heat-insulating plate 62 is provided on the lower connecting piece 64 and is far away from the connecting cylinder 41, and the second heat-insulating plate 63 is provided on the upper connecting piece 64 and is close to the connecting cylinder 41; the first heat-insulating plate 62 and the second heat-insulating plate 63 are arranged in parallel.

[0035] Preferably, the first heat-insulating plate 62 is a bow shape larger than a semi-circle with the chord facing upwards; the second heat-insulating plate 63 has the same structure as the first heat-insulating plate 62 and the chord faces downwards.

[0036] Due to the difference in wall thickness between the reduction tank 3 and the connecting cylinder 41, it is convenient to install the fixing plate 61. The fixing plate 61 can be detachably connected to the mouth of the reduction tank 3 through fixing parts such as bolts, without affecting the welding between the connecting cylinder 41 and the reduction tank 3. The fire-blocking assembly is used to prevent the heat in the reduction tank 3 from being conducted to the crystallization cylinder 1, so as to avoid the situation that the crystallized magnesium condensed on the crystallization cylinder 1 is vaporized by heat and the output is reduced. The fire-blocking assembly plays a heat-insulating role, which is beneficial to increasing the temperature at the mouth of the reduction tank 3, thereby improving the reaction efficiency of the pellet material at the mouth of the reduction tank 3, having a certain output-increasing effect, and helping to increase the output of a single tank.

[0037] A curved air flow channel is formed between the first heat-insulating plate 62 and the second heat-insulating plate 63, which can reduce the heat radiation loss in the area of the reduction tank 3 through a simple structure, and has a significant heat-insulating effect. It also avoids the problem that a complex structure forms a large air resistance and affects the flow of magnesium vapor. The magnesium vapor finally flows into the condensation device of the present invention through the through hole in the center of the fixing plate 61 for condensation crystallization. At the same time, the collision trapping of particulate impurities in the magnesium vapor can also be realized through the fire-blocking assembly, having a certain impurity-removing effect.

[0038] Such as Figure 4 , preferably, a metal filter screen 65 is arranged in the through hole of the fixing plate 61. The metal filter screen 65 completely covers the through hole in the center of the fixing plate 61. The holes of the metal filter screen 65 are small, which can trap the particulate impurities entrained in the magnesium vapor and also have a certain effect of blocking heat conduction. The metal filter screen 65 can be made of a material such as brass that does not react with magnesium at high temperatures.

[0039] The present invention will be further described in detail below with specific embodiments.

[0040] Embodiment 1

[0041] The condensation device for collecting magnesium vapor in the production of metallic magnesium according to the present utility model, during specific operation, after putting the pellet material into the reduction tank 3, place the crystallization cylinder 1. The large-diameter end of the crystallization cylinder 1 abuts against the arc-shaped side wall edge of the positioning cylinder 46, and also abuts against the connection part of the connecting cylinder 41 and the inner jacket 42 of the jacket. The small-diameter end of the crystallization cylinder 1 is supported by the support frame 11. After the placement is completed, seal the sealing cover 45 with the water jacket flange 44, evacuate the reduction tank 3 through the vacuum pipeline 2 connected to the vacuum pump, and heat the reduction tank 3. At the same time, pass cooling water into the water-cooling chamber through the water inlet pipe 51 and the water outlet pipe 52 of the crystallization water jacket. The pellet material generates magnesium vapor when heated. The magnesium vapor enters the crystallization cylinder 1 along the air extraction direction of the vacuum pipeline 2. Since the outside of the crystallization cylinder 1 is surrounded by the crystallization water jacket for cooling, therefore, the magnesium vapor is cooled and solidified on the crystallization cylinder 1 to form crystalline magnesium. After the production is completed, pressurize the reduction tank 3 until the pressure is balanced, then open the sealing cover 45, take out the crystallization cylinder 1, and collect the crystalline magnesium on the crystallization cylinder 1.

[0042] According to statistics, the number of rough magnesium burns and blocked tanks caused by poor condensation in the inventor's enterprise over the years has reached about 1,000. Calculated based on 30 kg of magnesium produced per tank and a selling price of 20,000 yuan per ton of magnesium, the application of the condensation device of the present utility model can reduce losses by 600,000 yuan per year and save 400,000 yuan in straw rope costs.

[0043] Embodiment 2

[0044] Based on the above embodiment, this embodiment further includes: a fire-blocking component is provided at the connection part of the connecting cylinder 41 and the reduction tank 3. When the magnesium vapor enters the connecting cylinder 41 from the reduction tank 3, it first passes through the curved air flow channel formed between the first heat insulation plate 62 and the second heat insulation plate 63, and then passes through the fixing plate 61 with the metal filter net 65, and the particulate impurities entrained in the magnesium vapor are collision-captured, having a certain impurity removal effect. At the same time, the fire-blocking component can also reduce the heat radiation loss in the reduction tank 3 area, which is beneficial to increasing the temperature at the tank mouth of the reduction tank 3, having a certain yield-increasing effect and helping to improve the yield of a single tank.

[0045] It should be noted that in the present utility model, the detailed structures of some devices are not described in detail, but they belong to the prior art known to those skilled in the art, so they will not be elaborated here. In addition, the parts not involved in this device are the same as the prior art or can be implemented by the prior art.

[0046] It should be noted that pressure sensors, flow meters or temperature sensors are provided on the conveying pipelines inside the device between different units and devices, and different valves are also provided, such as pressure relief valves, pressure regulating valves, safety valves, etc., which are used to adjust and stabilize the pressure of the entire device.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A condensation device for collecting magnesium vapor in the production of metallic magnesium, characterized in that, Including: A conical crystallization cylinder, a crystallization water jacket, a vacuum pipeline, and a cooling water pipeline; the crystallization water jacket includes a connecting cylinder with a frustum of a cone structure, an inner jacket cylinder, and an outer jacket cylinder. The inner jacket cylinder and the outer jacket cylinder are conical cylinder structures arranged coaxially. The outer jacket cylinder is sleeved outside the inner jacket cylinder and encloses a sealed water cooling chamber with the inner jacket cylinder. The small-diameter end of the connecting cylinder is connected to the mouth of the reduction tank, and the large-diameter end of the connecting cylinder is connected to the small-diameter end of the inner jacket cylinder. The crystallization cylinder is received inside the crystallization water jacket, and the large-diameter end of the crystallization cylinder is seamlessly butted against the connection part of the connecting cylinder and the inner jacket cylinder. A support frame is provided outside the small-diameter end of the crystallization cylinder. The support frame is semi-circular ring-shaped and abuts against the inner wall of the inner jacket cylinder. A water jacket flange is provided at one end of the inner jacket cylinder away from the reduction tank, and a sealing cover is connected to the water jacket flange. The vacuum pipeline is arranged on one side close to the water jacket flange, and one end penetrates the crystallization water jacket and is communicated with the inside of the inner jacket cylinder, and the other end is connected to a vacuum pump. The cooling water pipeline includes a water inlet pipe and a water outlet pipe. Both the water inlet pipe and the water outlet pipe penetrate the outer jacket cylinder and are communicated with the water cooling chamber. A channel partition is arranged along the axial direction of the inner jacket cylinder between the water inlet pipe and the water outlet pipe.

2. The condensation device for collecting magnesium vapor in the production of metallic magnesium according to claim 1, wherein, The connecting cylinder and the inner jacket cylinder are integrally formed by pressing seamless pipes; the outer jacket cylinder is formed by rolling and welding a steel plate outside the inner jacket cylinder; the crystallization cylinder is formed by pressing a seamless pipe.

3. The condensation device for collecting magnesium vapor in magnesium production according to claim 1, wherein A positioning cylinder is further arranged in the connecting cylinder. The positioning cylinder is a conical cylinder structure. The large-diameter end of the positioning cylinder is connected to the inner wall of the connecting cylinder, and the small-diameter end of the positioning cylinder is inserted into the crystallization cylinder and abuts against the inner wall of the crystallization cylinder.

4. The condensation device for collecting magnesium vapor in magnesium production according to claim 3, characterized in that, The side wall of the positioning cylinder is an inwardly concave arc, and the inner wall of the crystallization cylinder abuts against the edge of the arc-shaped side wall of the positioning cylinder.

5. The condensation device for collecting magnesium vapor in the production of metallic magnesium according to claim 1, characterized in that, The wall thickness of the reduction tank is greater than the wall thicknesses of the connecting cylinder and the inner jacket cylinder.

6. The condensation device for collecting magnesium vapor in the production of metallic magnesium according to claim 5, characterized in that A fire-blocking component is further arranged at the connection part of the connecting cylinder and the reduction tank. The fire-blocking component includes a fixing plate and first heat-insulating plates and second heat-insulating plates arranged alternately up and down. A through hole is opened at the center position of the fixing plate, and the fixing plate is fixed at the mouth of the reduction tank. Arc-shaped connecting pieces are respectively arranged on the upper and lower sides of the fixing plate. The connecting pieces extend towards the reduction tank and abut against the inner wall of the reduction tank. The first heat-insulating plate is arranged on the lower connecting piece away from the connecting cylinder, and the second heat-insulating plate is arranged on the upper connecting piece close to the connecting cylinder. The first heat-insulating plate and the second heat-insulating plate are arranged in parallel.

7. The condensation device for collecting magnesium vapor in the production of metallic magnesium according to claim 6, characterized in that, The first heat-insulating plate is a bow-shaped larger than a semi-circle with the chord facing upwards; the second heat-insulating plate has the same structure as the first heat-insulating plate and the chord faces downwards.

8. The condensation device for collecting magnesium vapor in magnesium production according to claim 6, characterized in that, A metal filter screen is arranged in the through hole on the fixing plate.

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