Device for efficiently extracting crude magnesium from electrolytic bath

Abstract

The invention relates to the field of titanium sponge production, and provides a device for efficiently extracting crude magnesium in an electrolytic bath, which comprises a magnesium collecting chamber, a first liquid level meter, a second liquid level meter and a second liquid level meter, the magnesium collecting tank is used for directionally collecting the electrolytic crude magnesium in the magnesium collecting chamber and playing a role in standing and refining the liquid magnesium; one end of the communicating pipe is communicated with the magnesium collecting chamber, and the other end of the communicating pipe is communicated with the magnesium collecting tank; a first argon port is formed in the bottom of the under-liquid tank, the under-liquid tank is reversely placed in the magnesium collecting chamber, an argon pipe is arranged on the first argon port, and argon is filled into the under-liquid tank through the argon pipe to adjust the liquid level of the magnesium collecting chamber, so that the electrolytic crude magnesium in the magnesium collecting chamber flows into the magnesium collecting tank; and the two-man ladle is communicated with the magnesium collecting tank. According to the device for efficiently extracting the crude magnesium from the electrolytic bath, through the synergistic effect of the magnesium collecting tank and the submerged tank, the production efficiency is improved while the product quality is improved, and in addition, the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of sponge titanium production, and more specifically, to a device for efficiently extracting crude magnesium in an electrolytic cell. Background Technology

[0002] Currently, the main production method for sponge titanium is the Klauer process. Magnesium is the direct raw material for sponge titanium production, and most companies using the magnesothermic process to produce sponge titanium have integrated corresponding magnesium electrolysis technology. This significantly reduces production costs and enables magnesium-chlorine recycling during production. The electrolytes in the electrolytic cell are mainly MgCl2, NaCl, and CaCl2. Magnesium (i.e., crude magnesium) is produced by continuously consuming MgCl2. This crude magnesium often contains a large amount of electrolyte and oxide impurities. When using electrolytic magnesium as a reducing agent to produce sponge titanium, these impurities not only reduce production efficiency but also introduce these impurities into the sponge titanium, significantly reducing its quality. Therefore, further refining and purification of the electrolytic magnesium is necessary to meet the production requirements of high-quality sponge titanium.

[0003] To meet the production needs of sponge titanium, crude magnesium needs to be continuously extracted from the magnesium collection chamber electrolytic cell and refined for use in sponge titanium production. The crude magnesium layer formed in the electrolytic cell is 80-150 mm thick and contains a mixed layer of liquid magnesium and magnesium chloride, an electrolyte layer, and a slag layer. When extracting magnesium, the end of the magnesium extraction tube of the magnesium lifting bag is inserted into the liquid magnesium layer. Because the crude magnesium layer is thin and cannot be allowed to settle in time, it takes a long time to determine the position of the magnesium extraction tube when extracting crude magnesium. In addition, a large amount of electrolyte and oxide impurities are extracted along with the crude magnesium, which will consume more costs in the subsequent refining process.

[0004] In summary, existing technologies for extracting crude magnesium using multi-stage magnesium electrolysis cells suffer from problems such as high impurity content, low efficiency, and high cost.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a device for efficiently extracting crude magnesium in an electrolytic cell, so as to solve the problems of high impurity content, low efficiency and high cost in the extraction of crude magnesium in existing multi-stage magnesium electrolytic cells.

[0007] To achieve the above objectives, the technical solution of the present invention is implemented as follows: An apparatus for efficiently extracting crude magnesium in an electrolytic cell, the apparatus comprising: A magnesium collecting chamber is used to store electrolytic crude magnesium. A first level gauge is installed in the magnesium collecting chamber to monitor the crude magnesium level in real time. Magnesium collecting tank, which is used to collect electrolytic crude magnesium in a directional manner in the magnesium collecting chamber and to play a role in the static refining of liquid magnesium; A connecting pipe, one end of which is connected to the magnesium collecting chamber and the other end of which is connected to the magnesium collecting tank; A submersible tank has an opening at its top, which connects it to the magnesium collection chamber. A first argon gas inlet is located at the bottom of the submersible tank. The submersible tank is placed upside down at the bottom of the magnesium collection chamber. An argon gas pipe is installed at the first argon gas inlet. Argon gas is introduced into the submersible tank through the argon gas pipe to adjust the liquid level in the magnesium collection chamber, causing the electrolytic crude magnesium in the magnesium collection chamber to flow into the magnesium collection tank. A lifting bag, used for extracting crude magnesium, is connected to the magnesium collection tank. The opening at one end of the magnesium collecting chamber connected to the connecting pipe is the magnesium collecting port. The magnesium collecting port is used to overflow the crude magnesium in the magnesium collecting chamber into the magnesium collecting tank. The height of the magnesium collecting port is 4-6 cm higher than the crude magnesium liquid level of the electrolyte in the magnesium collecting chamber. The magnesium collecting tank and the connecting pipe are connected at one end, which is located below the side of the magnesium collecting tank. The method of using the apparatus for efficient extraction of crude magnesium within the electrolytic cell includes the following steps: S1. During the production of crude magnesium in the magnesium collection chamber electrolytic cell, the thickness h of crude magnesium generated during the electrolysis process is obtained by the first level gauge. S2. Determine whether the thickness h of the crude magnesium production is greater than or equal to the preset target thickness H. If yes, proceed to step S3; otherwise, return to step S1. S3. Begin collecting crude magnesium into the magnesium collecting tank. First, monitor the level using the first level gauge. Simultaneously, adjust the level by filling the submerged tank with argon gas until the crude magnesium in the collecting chamber can just overflow into the magnesium collecting tank through the collecting port. This is the initial level of crude magnesium. At this time, the pressure of the submerged tank is obtained as P1. After adjusting the initial level of crude magnesium, continue to fill the submerged tank with argon gas at a constant pressure to ensure that the crude magnesium in the collecting chamber continuously overflows into the magnesium collecting tank through the collecting port. At this time, the pressure of the submerged tank is obtained as P2. S4. Determine if the thickness h of the crude magnesium formation is 0. If yes, proceed to step S5; otherwise, return to step S3. S5. Stop filling the submerged tank with argon gas. This round of crude magnesium collection is complete. Obtain the liquid magnesium level in the magnesium collection tank through the second level gauge. S6. Determine whether the liquid magnesium level in the magnesium collection tank is greater than or equal to the preset liquid magnesium level. If so, insert the siphon tube of the lifting bag into the crude magnesium through the magnesium outlet of the magnesium collection tank to extract liquid magnesium.

[0008] Furthermore, a magnesium outlet is provided at the top of the magnesium collection tank, and the lifting bag is connected to the magnesium collection tank through the magnesium outlet.

[0009] Furthermore, a sealing plate is provided on the magnesium outlet.

[0010] Furthermore, a second argon gas port is provided on the sealing plate, which is used to fill the magnesium collection tank with argon gas.

[0011] Furthermore, a pressure sensor is installed inside the submersible tank.

[0012] Furthermore, a second level gauge is installed in the magnesium collection tank, which is used to monitor the liquid level in the magnesium collection tank in real time.

[0013] Furthermore, the preset target thickness value H is 0.08~0.15m.

[0014] The present invention provides a device for efficient extraction of crude magnesium in an electrolytic cell. Compared with the prior art, the device for efficient extraction of crude magnesium in an electrolytic cell described in the present invention has the following advantages: 1) The device for efficient extraction of crude magnesium in an electrolytic cell described in this invention can effectively collect the electrolytic crude magnesium in the magnesium collection chamber into the magnesium collection tank through the synergistic effect of the magnesium collection tank and the submerged tank. This effectively avoids the risk of directly extracting electrolyte into the magnesium collection chamber, reduces the impurity content in the crude magnesium, and improves the efficiency of crude magnesium extraction while improving product quality.

[0015] 2) The device for efficiently extracting crude magnesium in an electrolytic cell as described in this invention allows the crude magnesium to be collected in a magnesium collection tank in a timely manner, which effectively increases the static stratification effect of the crude magnesium, reduces the impurity content in the crude magnesium, improves the quality of the crude magnesium, and reduces the cost of subsequent liquid magnesium refining. Attached Figure Description

[0016] Figure 1 This is one of the three-dimensional structural schematic diagrams of a device for efficiently extracting crude magnesium in an electrolytic cell according to an embodiment of the present invention; Figure 2 This is a rear cross-sectional view of a device for efficiently extracting crude magnesium in an electrolytic cell according to an embodiment of the present invention. Figure 3 This is a second three-dimensional structural schematic diagram of a device for efficiently extracting crude magnesium in an electrolytic cell according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the exploded structure of a device for efficiently extracting crude magnesium in an electrolytic cell according to an embodiment of the present invention. Figure 5 This is a bottom view of the submersible tank for efficiently extracting crude magnesium in an electrolytic cell, as described in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Magnesium collection chamber; 2. Magnesium collection tank; 3. Magnesium collection port; 4. Submersible tank; 41. Opening; 5. First level gauge; 7. Connecting pipe; 8. Magnesium outlet. Detailed Implementation

[0018] To make the technical means and objectives and effects of the present invention easier to understand, the embodiments of the present invention will be described in detail below with reference to specific illustrations.

[0019] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example

[0023] In a multi-stage magnesium electrolyzer, after magnesium chloride is electrolyzed, the electrolytic magnesium flows from the electrolysis chamber to the magnesium collection chamber 1. The traditional method for extracting crude magnesium is to use a siphon to directly draw it into the collection chamber 1. However, because the collection chamber 1 contains a large amount of electrolyte, the crude magnesium layer is only 80-100 mm thick and contains a large amount of electrolyte and oxide impurities. Therefore, when placing the siphon, the insertion depth into the magnesium layer must be precisely controlled to avoid directly extracting electrolytes. With this device and method, extracting crude magnesium is time-consuming and labor-intensive, and the extracted crude magnesium contains a large amount of electrolyte and oxide inclusions, further increasing the subsequent refining costs of the electrolyzed magnesium.

[0024] Existing technologies such as multi-stage magnesium electrolysis cells suffer from high impurity content, low efficiency, and high cost when extracting crude magnesium.

[0025] Current technology relies solely on the opening and closing of gate valves to control the overflow of liquid magnesium, resulting in a rather crude control method. Gate valves only have two states: fully open and fully closed, or simple opening adjustment. Furthermore, liquid magnesium can only be collected into the overflow tank when the magnesium layer thickness reaches the required level and the liquid magnesium layer height reaches the overflow port. This makes it impossible to perform real-time and precise flow control based on the rate of liquid magnesium formation and liquid level changes during electrolysis, severely impacting production efficiency and the stable operation of the electrolytic cell.

[0026] To solve the above-mentioned technical problems, in this embodiment, as follows: Figures 1-5 As shown, the applicant proposes a device for efficient extraction of crude magnesium within an electrolytic cell, the device comprising: Magnesium collecting chamber 1, in which crude magnesium is electrolyzed, the magnesium collecting chamber 1 is used to store electrolyzed crude magnesium, and a first liquid level gauge 5 is installed in the magnesium collecting chamber 1. The first liquid level gauge 5 is used to monitor the crude magnesium liquid level in real time, so as to clarify the crude magnesium generation during the electrolysis process. Magnesium collecting tank 2 is used to collect the electrolytic crude magnesium in magnesium collecting chamber 1 in a directional manner and to play a role in the static refining of liquid magnesium. After the crude magnesium enters magnesium collecting tank 2, it can effectively remove electrolytes and oxide impurities in the crude magnesium by standing for a period of time, thereby improving the purity of crude magnesium and improving product quality. Magnesium collecting tank 2 is located in magnesium collecting chamber 1. A connecting pipe 7, one end of which is connected to the magnesium collecting chamber 1, and the other end of which is connected to the magnesium collecting tank 2; A submersible tank 4 has an opening 41 on its top, which connects the submersible tank 4 to the magnesium collection chamber 1. A first argon gas port is located on the bottom of the submersible tank 4. The submersible tank 4 is placed upside down at the bottom of the magnesium collection chamber 1. An argon gas pipe is installed on the first argon gas port. Argon gas is introduced into the submersible tank 4 through the argon gas pipe to adjust the liquid level in the magnesium collection chamber 1, so that the electrolytic crude magnesium in the magnesium collection chamber 1 flows into the magnesium collection tank 2. This ensures that the crude magnesium layer remains stable during the collection process, which not only reduces the mixing of impurities and improves product quality, but also improves production efficiency. A lifting bag is used to extract crude magnesium, and the lifting bag is connected to the magnesium collection tank 2.

[0027] Specifically, a second level gauge is installed in the magnesium collection tank 2. The second level gauge is used to monitor the crude magnesium level in the magnesium collection tank 2 in real time, so as to make it easy to determine the amount of crude magnesium stored in the magnesium collection tank 2.

[0028] Specifically, the end of the magnesium collecting chamber 1 that connects to the connecting pipe 7 is called the magnesium collecting port 3. The magnesium collecting port 3 is used to overflow the crude magnesium in the magnesium collecting chamber 1 into the magnesium collecting tank 2. The height of the magnesium collecting port 3 is 4-6 cm higher than the crude magnesium liquid level of the electrolyte in the magnesium collecting chamber 1.

[0029] Specifically, the port of the magnesium collecting tank 2 and the connecting pipe 7 is located on the lower side of the magnesium collecting tank 2. This design allows crude magnesium to enter the magnesium collecting tank 2 by overflow, reducing the possibility of impurities being introduced by mechanical stirring or other processes.

[0030] The present invention discloses an efficient device for extracting crude magnesium in an electrolytic cell. The liquid level of the submerged tank 4 is adjusted to quickly and easily control the height of the magnesium layer in the magnesium collection chamber 1, thereby enabling faster and more effective collection of liquid magnesium through the magnesium collection port 3. This improves production efficiency while ensuring the stable operation of the electrolytic cell, and can better meet the complex and ever-changing on-site production conditions, achieving unexpected technical results.

[0031] Through the synergistic effect of magnesium collection tank 2 and submersible tank 4, not only can electrolytes and oxide impurities be effectively removed, improving the purity of crude magnesium and product quality, but also production efficiency is increased and costs are reduced.

[0032] Specifically, a magnesium outlet 8 is provided at the top of the magnesium collection tank 2, and the lifting bag is connected to the magnesium collection tank 2 through the magnesium outlet 8. This arrangement facilitates the extraction of crude magnesium from the magnesium collection tank 2.

[0033] Specifically, a sealing plate is installed on the magnesium outlet 8 to ensure the airtightness during the magnesium outlet process and prevent air from entering and causing magnesium oxidation.

[0034] Specifically, a second argon gas port is provided on the sealing plate. The second argon gas port is used to fill the magnesium collection tank 2 with argon gas to prevent the liquid magnesium from oxidizing.

[0035] In summary, the apparatus and method for efficiently extracting crude magnesium in an electrolytic cell described in this invention are interconnected, and steps S1 to S6 of the method for efficiently extracting crude magnesium in an electrolytic cell described in this invention are interconnected, work together, and are inseparable. These features combined play multiple roles: First, the extraction process is flexible, controllable, and highly adaptable: By filling the submerged tank 4 with argon gas, the liquid level in the magnesium collection chamber can be adjusted, achieving precise control of the flow of crude magnesium to the magnesium collection tank 2; during the extraction process, by acquiring the pressure values ​​(P1 and P2) of the submerged tank 4 at different stages and combining them with the liquid level changes, the extraction flow rate and speed of crude magnesium can be precisely controlled, achieving refined management of the extraction process, improving production efficiency while ensuring the stable operation of the electrolytic cell.

[0036] Second, the structural optimization design: the design of the magnesium collecting port 3 being 4-6 cm higher than the crude magnesium liquid level of the electrolyte in the magnesium collecting chamber, and the specific position setting of the connecting pipe opening between the magnesium collecting tank 2 and the connecting pipe 7, facilitate the smooth and stable flow of crude magnesium from the magnesium collecting chamber 1 to the magnesium collecting tank, reducing problems such as resistance, turbulence and impurity mixing in the fluid flow process, and improving the extraction efficiency and the quality of crude magnesium.

[0037] Specifically, the preset target thickness value H is 0.08~0.15m.

[0038] Specifically, P2 = P1 + ρgh, where ρ is the density of the electrolyte, and the unit of ρ is kg / m³. 3 g is the acceleration due to gravity, g = 10 m / s² 2 The unit of h is m.

[0039] This embodiment proposes a method for efficient extraction of crude magnesium in an electrolytic cell. Steps S1 to S6 are interconnected and work together, offering the following advantages: By monitoring the first liquid level gauge 5 in step S1, the collection of crude magnesium during the electrolysis process can be monitored in real time, allowing for timely adjustments to production parameters. Steps S2 and S3 control the liquid level in the magnesium collection chamber 1 by adjusting the pressure of the submerged tank 4, ensuring the crude magnesium flows smoothly to the magnesium collection tank 2. Step S4, constant pressure collection, involves continuously filling the submerged tank 4 with argon gas at a constant pressure during magnesium collection, ensuring that the crude magnesium in the magnesium collection chamber 1 continuously overflows into the magnesium collection tank 2 through the magnesium collection port 3, achieving continuous collection and improving collection efficiency. Once a certain thickness of crude magnesium has been collected in the magnesium collection tank 2, argon filling of the submerged tank 4 is stopped, avoiding resource waste. Steps S5 and S6, when extracting crude magnesium using a lifting bag, simply insert the siphon tube attached to the lifting bag through the opening of the magnesium collection tank 2 into the crude magnesium to extract liquid magnesium by emptying the lifting bag; the operation is simple and quick. The siphon tube extraction method avoids the magnesium slag splashing and air pollution problems that may occur with traditional methods.

[0040] The apparatus and method for efficient extraction of crude magnesium in an electrolytic cell described in this invention are interconnected and have the following advantages: I. Improve product quality: Through the synergistic effect of the static refining action of magnesium collection tank 2 and the precise control of submersible tank 4, electrolytes and oxide impurities can be effectively removed, improving the purity of crude magnesium and thus enhancing product quality.

[0041] II. Improved Production Efficiency: On the one hand, real-time monitoring by the first and second level gauges enables automated control of the electrolysis and crude magnesium collection processes. When the liquid level reaches the set value, the system automatically adjusts the pressure of the submerged tank to ensure that the crude magnesium flows smoothly to the magnesium collection tank 2, reducing manual intervention and waiting time. On the other hand, the design of the magnesium collection port 3 allows the crude magnesium to overflow into the magnesium collection tank 2, avoiding the introduction of impurities through mechanical stirring. At the same time, the constant pressure argon filling ensures continuous collection of crude magnesium, improving production efficiency.

[0042] Third, cost reduction: On the one hand, it reduces manual intervention and lowers labor costs; on the other hand, the static refining effect of magnesium collection tank 2 reduces the impurity content in crude magnesium, lowering the difficulty and cost of subsequent refining processes. Furthermore, the increased purity of crude magnesium also reduces the consumption of chemical reagents and energy required during the refining process.

[0043] IV. Enhanced Safety: On the one hand, a sealing plate is installed on the magnesium outlet 8, and argon gas is filled into the magnesium collection tank 2 through the second argon gas port, ensuring the airtightness during the magnesium discharge process. This effectively prevents air from entering and causing magnesium oxidation and combustion, thus improving the safety of the production process. On the other hand, real-time monitoring by the level gauge allows for timely detection and handling of abnormal situations during the electrolysis process, such as excessively high or low liquid levels. This helps avoid potential safety risks and ensures the smooth operation of the production process.

[0044] In summary, the device and method for efficient extraction of crude magnesium in an electrolytic cell proposed in this embodiment achieve multiple advantages through innovative design and optimized operation procedures, including improved product quality, increased production efficiency, reduced costs, enhanced safety, and streamlined operation. These advantages make this device and method promising for broad application prospects and economic benefits in the field of crude magnesium extraction in multi-stage magnesium electrolytic cells.

[0045] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A device for efficiently extracting crude magnesium in an electrolytic cell, characterized in that, The device for efficiently extracting crude magnesium in the electrolytic cell comprises: a magnesium collecting chamber (1) for storing electrolytic crude magnesium, a first liquid level meter (5) arranged in the magnesium collecting chamber (1) for real-time monitoring of the crude magnesium liquid level; a magnesium collecting tank (2) for directional collection of the electrolytic crude magnesium in the magnesium collecting chamber (1) and exerting the effect of liquid magnesium standing refining; a communication pipe (7) having one end in communication with the magnesium collecting chamber (1) and the other end in communication with the magnesium collecting tank (2); a submergence tank (4) having an opening (41) arranged on the top of the submergence tank (4) and in communication with the magnesium collecting chamber (1), a first argon gas port arranged on the bottom of the submergence tank (4), the submergence tank (4) being placed upside down in the magnesium collecting chamber (1), and an argon gas pipe arranged on the first argon gas port for adjusting the liquid level of the magnesium collecting chamber (1) by filling argon gas into the submergence tank (4) to make the electrolytic crude magnesium in the magnesium collecting chamber (1) flow into the magnesium collecting tank (2); a ladle for extracting crude magnesium, the ladle being in communication with the magnesium collecting tank (2); a magnesium collecting port (3) arranged at the pipe opening of the one end of the communication pipe (7) in communication with the magnesium collecting chamber (1), the magnesium collecting port (3) being used for overflowing the crude magnesium in the magnesium collecting chamber (1) into the magnesium collecting tank (2), and the height of the magnesium collecting port (3) being 4-6 cm higher than the crude magnesium liquid level of the electrolyte in the magnesium collecting chamber (1); the pipe opening of the one end of the communication pipe (7) in communication with the magnesium collecting tank (2) is arranged below the side of the magnesium collecting tank (2); The method for using the device for efficiently extracting crude magnesium in the electrolytic cell comprises the following steps: S1. In the normal production process, the thickness h of the generated crude magnesium in the electrolysis process is obtained by the first liquid level meter (5); S2. It is judged whether the thickness h of the generated crude magnesium is greater than or equal to the preset target thickness value H. If yes, step S3 is entered. If no, step S1 is returned; S3. The crude magnesium is started to be collected into the magnesium collecting tank (2). First, the first liquid level meter (5) is monitored, and at the same time, the liquid level is adjusted by filling argon gas into the submergence tank (4) to make the crude magnesium in the magnesium collecting chamber (1) just overflow through the magnesium collecting port (3) into the magnesium collecting tank (2). This is the initial liquid level for extracting crude magnesium. At this time, the pressure P1 of the submergence tank (4) is obtained. After the initial liquid level for extracting crude magnesium is adjusted, argon gas is continuously filled into the submergence tank (4) at a constant pressure to ensure that the crude magnesium in the magnesium collecting chamber (1) continuously overflows through the magnesium collecting port (3) into the magnesium collecting tank (2). At this time, the pressure P2 of the submergence tank (4) is obtained; S4. It is judged whether the thickness h of the generated crude magnesium is 0. If yes, step S5 is entered. If no, step S3 is returned; S5. The filling of argon gas into the submergence tank (4) is stopped, and the collection of crude magnesium in this round is completed. The liquid magnesium liquid level in the magnesium collecting tank (2) is obtained by the second liquid level meter; S6. It is judged whether the liquid magnesium liquid level in the magnesium collecting tank (2) is greater than or equal to the preset liquid magnesium liquid level. If yes, the siphon pipe of the ladle is inserted into the crude magnesium through the magnesium outlet of the magnesium collecting tank (2) to perform the extraction of liquid magnesium.

2. The device for efficiently extracting crude magnesium in an electrolytic cell according to claim 1, characterized in that, A magnesium outlet (8) is arranged on the top of the magnesium collecting tank (2), and the ladle communicates with the magnesium collecting tank (2) through the magnesium outlet (8).

3. The device for efficiently extracting crude magnesium in an electrolytic cell according to claim 2, characterized in that, A sealing plate is arranged on the magnesium outlet (8).

4. The device for efficiently extracting crude magnesium in an electrolytic cell according to claim 3, characterized in that, A second argon outlet is arranged on the sealing plate, and the second argon outlet is used for filling argon into the magnesium collecting tank (2).

5. The device for efficiently extracting crude magnesium in an electrolytic cell according to claim 1, characterized in that, A pressure sensor is arranged in the under-liquid tank (4).

6. The device for efficiently extracting crude magnesium in an electrolytic cell according to claim 1, characterized in that, A second liquid level meter is arranged in the magnesium collecting tank (2), and the second liquid level meter is used for monitoring the liquid level in the magnesium collecting tank (2) in real time.

7. The device for efficiently extracting crude magnesium in an electrolytic cell according to claim 1, characterized in that, The preset target thickness value H is 0.08-0.15 m.

Images