Automatic feeding / discharging system of magnesium electrolytic cell and use method of automatic feeding / discharging system

Abstract

The invention belongs to the technical field of magnesium smelting, and relates to magnesium smelting by an electrolytic method, in particular to an automatic feeding / discharging system of a magnesium electrolytic cell and a use method of the automatic feeding / discharging system. According to the automatic feeding / discharging system, linkage control is carried out on the magnesium layer thickness measuring unit, the magnesium layer liquid level measuring unit, the first electric valve, the second electric valve, the argon assembly, the vacuum assembly and the distributed control system. By changing a traditional manual feeding and discharging mode, the labor amount is reduced, the production efficiency is improved, a large amount of labor force can be saved, personnel posts are saved, energy consumption and capital occupation are reduced, the electrolysis efficiency is improved, the product quality is improved, and the service life of equipment is prolonged; by optimizing the device design, the safety performance and the environmental protection performance of the device are improved, the aims of improving the productivity, saving the energy consumption, improving the product quality, shortening the production time and reducing the safety risk are achieved, and good application prospects are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of magnesium smelting, relates to electrolytic magnesium smelting, and in particular to an automatic feeding / discharging system of a magnesium electrolytic cell and a use method thereof. Background Art

[0002] Magnesium metal is an important raw material in the production process of titanium sponge, which is widely used in aviation, aerospace, chemical industry, petroleum, medicine and other fields. With the development of science and technology, there are currently two main methods for magnesium smelting: ① Dehydrating or roasting the solution containing magnesium chloride from spinel, brine or seawater to form a magnesium chloride melt, and then electrolyzing it. This method is called electrolysis; ② Using ferrosilicon to thermally reduce the magnesium oxide produced by calcination from carbonate ore. This method is called thermal reduction (Pijeng method). Among them, the principle of electrolytic magnesium refining is to electrolyze molten anhydrous magnesium chloride under high temperature environment to decompose it into metallic magnesium and chlorine. However, under high temperature environment, the influence of water on the properties of molten salt is fatal, so high-purity anhydrous magnesium chloride is the key to electrolytic magnesium production.

[0003] In the existing electrolytic magnesium production equipment, the feeding method of magnesium chloride is to manually add molten magnesium chloride to the magnesium collecting chamber of the electrolytic cell intermittently and quickly, such as: adding 6 to 8 times a day, adding about 2 tons each time, and each feeding time is about 3 minutes. However, this feeding method has the following shortcomings: (1) Rapid feeding causes the slag (mainly magnesium oxide) deposited at the bottom of the magnesium collecting chamber to be rolled up and enter the electrolytic chamber with the circulation of the electrolyte, adhering to the electrode surface to cause electrode passivation; (2) Rapid feeding causes the electrolytic cell liquid level to fluctuate too much, which will cause air to be sucked in from the feeding port, causing oxidation and nitridation loss of liquid magnesium on the surface of the magnesium collecting chamber, and on the other hand, it may also cause the electrolytic chamber to form a current short circuit due to the excessively high liquid level. The shortcomings of the above-mentioned feeding method will inevitably increase the risk of impurities entrained by manual feeding, resulting in a decrease in the electrolysis efficiency of the electrolytic cell, a decrease in production efficiency, and a high impurity content in the produced liquid magnesium.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an automatic feeding / discharging system for a magnesium electrolytic cell and a method for using the same, so as to improve production output and quality, provide protection for safety and environmental protection in the production process, and extend the service life of the equipment.

[0006] The automatic feeding / discharging system of the magnesium electrolytic cell comprises: a magnesium chloride crucible, a liquid magnesium crucible and a distributed control system;

[0007] The magnesium chloride crucible is connected to a plurality of magnesium electrolytic cells through a magnesium chloride pipeline, the magnesium chloride pipeline is divided into multiple paths, the outlet of each magnesium chloride pipeline is connected to the corresponding magnesium electrolytic cell, and each magnesium chloride pipeline is provided with a first electric valve, and the first electric valve is connected to a distributed control system;

[0008] Each of the magnesium electrolytic cells is also connected to a liquid magnesium crucible via a liquid magnesium pipeline, the liquid magnesium pipeline is divided into multiple channels, and each liquid magnesium pipeline is provided with a second electric valve, and the second electric valve is connected to a distributed control system; each of the magnesium electrolytic cells is provided with a magnesium layer thickness measuring unit and a magnesium layer liquid level measuring unit, and the magnesium layer thickness measuring unit and the magnesium layer liquid level measuring unit are both connected to a distributed control system;

[0009] The magnesium chloride pipeline and the liquid magnesium pipeline are respectively provided with pipeline heaters, and the pipeline heaters are connected to a distributed control system; the magnesium chloride crucible is also connected to an argon buffer tank through a first vacuum component, and the liquid magnesium crucible is also connected to a vacuum buffer tank through a second vacuum component; the distributed control system is used to control the opening or closing of the third electric valve in the first vacuum component and the opening or closing of the fourth electric valve in the second vacuum component.

[0010] Furthermore, the magnesium chloride pipeline and the liquid magnesium pipeline are both double-layer hollow pipelines, and the double-layer hollow pipeline is composed of an inner layer tube and an outer layer tube;

[0011] The pipeline heater comprises a heating wire arranged on the outer wall of the inner tube, the heating wire is fixed in the inner tube by a plurality of support rings, and the heating wire is connected to a distributed control system. Preferably, the heating wire is a nickel-chromium alloy heating wire.

[0012] Preferably, the support ring is provided with a plurality of through holes along its axial direction for passing the heating wires.

[0013] Specifically, the exteriors of the magnesium chloride pipeline and the liquid magnesium pipeline are both provided with thermal insulation structures.

[0014] Specifically, the magnesium chloride crucible is provided with a first feeding port, and the liquid magnesium crucible is provided with a second feeding port.

[0015] Similarly, each of the magnesium electrolytic cells is provided with a magnesium chloride feeding port and a liquid magnesium feeding port.

[0016] Specifically, the outlet of each magnesium chloride pipeline is connected to the magnesium chloride feeding port, and the outlet of each liquid magnesium pipeline is connected to the liquid magnesium feeding port.

[0017] Optionally, the first vacuum component includes an argon buffer tank, which is connected to the magnesium chloride crucible through a first pipeline, and a third electric valve for controlling the flow rate of argon is provided on the first pipeline, and the third electric valve is connected to the distributed control system.

[0018] Optionally, the second vacuum component includes a vacuum buffer tank, which is connected to the liquid magnesium crucible through a second pipeline, and a fourth electric valve for controlling the flow rate of the liquid magnesium is provided on the second pipeline, and the fourth electric valve is connected to the distributed control system.

[0019] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0020] The magnesium layer thickness measuring unit, the magnesium layer liquid level measuring unit, the first electric valve, the second electric valve, the first vacuum component, the second vacuum component and the distributed control system are linked and controlled as follows:

[0021] 1) Discharging: The magnesium layer thickness measuring unit is used to monitor the magnesium layer thickness of the corresponding magnesium electrolytic cell in real time. When the monitored magnesium layer thickness reaches the upper limit value, the thickness value is fed back to the distributed control system in time. The distributed control system controls the second electric valve of the liquid magnesium pipeline of the magnesium electrolytic cell corresponding to the current magnesium layer thickness measuring unit to open according to the preset thickness value; after the distributed control system recognizes that the second electric valve is opened, it starts the vacuum pump component and gradually adjusts the vacuum pump frequency to evacuate the liquid magnesium crucible. During the vacuuming process, the liquid magnesium crucible and its pipeline are in a vacuum state at this time. Under the action of vacuum, the liquid magnesium in the magnesium electrolytic cell is slowly extracted as the vacuum degree increases and flows into the liquid magnesium crucible through the liquid magnesium pipeline. When the monitored magnesium layer thickness reaches the lower limit value, the thickness value is fed back to the distributed control system in time. After receiving the information, the distributed control system closes the second electric valve and the vacuum component; at this time, discharging is completed.

[0022] 2) Feeding: After the discharge is completed, the magnesium layer liquid level measurement unit is used to monitor the magnesium layer liquid level of the current magnesium electrolytic cell in real time. When the monitored magnesium layer liquid level value reaches the lower limit value, the liquid level value is promptly fed back to the distributed control system, and the distributed control system controls the first electric valve and the argon gas component of the magnesium chloride pipeline of the current magnesium electrolytic cell to open, and a positive pressure is gradually formed in the magnesium chloride crucible, and the magnesium chloride flows to the corresponding magnesium electrolytic cell through the magnesium chloride pipeline; when the magnesium layer liquid level reaches the preset upper limit value, the magnesium layer liquid level measurement unit feeds back the monitored liquid level value to the distributed control system in a timely manner, and the distributed control system closes the first electric valve and the argon gas component, and the feeding is completed at this time.

[0023] In summary, the automatic feeding / discharging system and the use method thereof provided by the present invention reduce the workload and improve the production efficiency by changing the traditional manual feeding and discharging methods; at the same time, the whole system is closed, avoiding the situation of impurities entrained in manual feeding, and improving the output, quality, electrolysis efficiency and service life of equipment such as electrolytic cells of liquid magnesium; at the same time, the waste gas generated during the manual feeding and magnesium discharging operations is reduced, and the production process is more environmentally friendly and has good application prospects. It can be applied to energy-saving and efficient sponge titanium production, and provides a sponge titanium production supporting equipment for related industries that can increase production and efficiency, save energy and reduce consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A top view of an automatic feeding / discharging system for a magnesium electrolytic cell provided by the present invention;

[0027] Figure 2 A side view of an automatic feeding / discharging system for a magnesium electrolytic cell provided by the present invention;

[0028] Figure 3 It is a structural diagram of the pipeline heater in the present invention.

[0029] Wherein: 1. magnesium chloride crucible; 1-1. magnesium chloride pipeline; 1-2. liquid magnesium pipeline; 2. liquid magnesium crucible; 3. first feeding port; 4. second feeding port; 5. second electric valve; 6. magnesium chloride feeding port; 7. liquid magnesium feeding port; 8. argon buffer tank; 9. vacuum buffer tank; 10. first electric valve; 11. magnesium electrolytic cell; 12. magnesium layer level measuring unit; 13. magnesium layer thickness measuring unit; 14. heating wire; 15. support ring; 16. pipeline heater; 17. terminal; 18. first pipeline; 19. second pipeline. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples consistent with some aspects of the present invention as detailed in the appended claims.

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] Example

[0033] See also Figures 1 to 3 , this embodiment provides an automatic feeding / discharging system for a magnesium electrolytic cell, comprising: a magnesium chloride crucible 1, a liquid magnesium crucible 2 and a distributed control system;

[0034] The magnesium chloride crucible 1 is connected to a plurality of magnesium electrolytic cells 11 through a magnesium chloride pipeline 1-1, the magnesium chloride pipeline 1-1 is divided into multiple routes, the outlet of each magnesium chloride pipeline 1-1 is connected to the corresponding magnesium electrolytic cell 11, and each magnesium chloride pipeline 1-1 is provided with a first electric valve 10, and the first electric valve 10 is connected to a distributed control system;

[0035] Each of the magnesium electrolytic cells 11 is also connected to the liquid magnesium crucible 2 through a liquid magnesium pipeline 1-2, and the liquid magnesium pipeline 1-2 is divided into multiple channels, and each liquid magnesium pipeline 1-2 is provided with a second electric valve 5, and the second electric valve 5 is connected to the distributed control system; each of the magnesium electrolytic cells 11 is provided with a magnesium layer thickness measuring unit 13 and a magnesium layer liquid level measuring unit 12, and both are connected to the distributed control system;

[0036] The magnesium chloride pipeline 1-1 and the liquid magnesium pipeline 1-2 are respectively provided with pipeline heaters 16, and the pipeline heaters 16 are connected to a distributed control system; the magnesium chloride crucible 1 is also connected to an argon buffer tank 8 through an argon component, and the liquid magnesium crucible 2 is also connected to a vacuum buffer tank 9 through a vacuum component; the distributed control system is used to control the start and stop of the argon component and the vacuum component.

[0037] Furthermore, the magnesium chloride pipeline 1-1 and the liquid magnesium pipeline 1-2 both adopt double-layer hollow tubes, which are composed of an inner tube and an outer tube; the pipeline heater 16 includes a heating wire 14 wound around the outer wall of the inner tube, and the heating wire 14 is connected to the distributed control system.

[0038] Furthermore, the outer wall of the inner tube is also sleeved with a plurality of support rings, and a plurality of through holes for passing the heating wire 14 are opened along the circumference of the support ring, and the through holes can facilitate the passage of the heating wire 14 and avoid short circuit. Preferably, the heating wire 14 is a nickel-chromium alloy heating wire.

[0039] It should be noted that the present embodiment does not specifically limit the type of the heating wire 14 of the pipeline heater. In principle, as long as the fluid (liquid magnesium or magnesium chloride) in the pipeline can be heated, for example, the heating wire 14 can be a high-temperature resistance wire. As for the arrangement of the high-temperature resistance wire, a relatively common spiral winding structure can be adopted, and the two ends of the high-temperature resistance wire (connection posts 17) are respectively connected to the distributed control system. Furthermore, in order to extend the service life of the heating wire 14, after the high-temperature resistance wire is wound around the outer wall of the inner tube, the outer wall of the inner tube and the inner wall of the outer tube are filled with crystalline magnesium oxide powder with good insulation and thermal conductivity.

[0040] In order to enhance the applicability of the system in different environments, the magnesium chloride pipeline 1-1 and the liquid magnesium pipeline 1-2 are both provided with thermal insulation structures on the outside. By fixing thermal insulation materials on the periphery of the magnesium chloride pipeline 1-1 and the periphery of the liquid magnesium pipeline 1-2, the pipelines can have good thermal insulation effects, thereby achieving efficient utilization of energy in the entire system.

[0041] In order to facilitate the operator to add materials, the magnesium chloride crucible 1 is provided with a first feeding port 3 for adding magnesium chloride, and the liquid magnesium crucible 2 is provided with a second feeding port 4 for adding liquid magnesium. Similarly, each of the magnesium electrolytic cells 11 is respectively provided with a magnesium chloride feeding port 6 and a liquid magnesium feeding port 7, and the outlet of each magnesium chloride pipeline 1-1 is connected to the magnesium chloride feeding port 6, and the outlet of each liquid magnesium pipeline 1-2 is connected to the liquid magnesium feeding port 7.

[0042] Furthermore, the first vacuum component includes an argon buffer tank 8, which is connected to the magnesium chloride crucible 1 through a first pipe 18. A third electric valve for controlling the flow rate of argon is provided on the first pipe 18, and the third electric valve is connected to the distributed control system.

[0043] Furthermore, the vacuum assembly includes a vacuum buffer tank 9, a vacuum pump, a fourth electric valve and a second pipeline 19. The vacuum buffer tank 9 is connected to the liquid magnesium crucible 2 through the vacuum pump through the second pipeline 19. The second pipeline 19 is respectively installed with a fourth electric valve and a flow meter. The vacuum pump and the fourth electric valve are both connected to the distributed control system.

[0044] In summary, the automatic feeding / discharging system provided by the present invention is particularly suitable for feeding / discharging of magnesium electrolytic cells in the production process of sponge titanium. The magnesium layer thickness measuring unit 13, the magnesium layer liquid level measuring unit 12, the first electric valve 10, the second electric valve 5, the argon component, the vacuum component and the distributed control system are linked and controlled. The specific method of use is as follows:

[0045] Automatic discharging: The magnesium layer thickness measuring unit 13 is used to monitor the magnesium layer thickness of the magnesium electrolytic cell 11 in real time. When the monitored magnesium layer thickness reaches the upper limit, the thickness value is fed back to the distributed control system in time. The distributed control system controls the second electric valve 5 of the liquid magnesium pipeline 1-2 of the magnesium electrolytic cell 11 corresponding to the current magnesium layer thickness measuring unit 13 to open according to the preset thickness value; after the distributed control system recognizes that the second electric valve 5 is opened, it starts the vacuum component and gradually adjusts the vacuum pump frequency to evacuate the liquid magnesium crucible 2. During the vacuuming process, the liquid magnesium crucible 2 and its pipeline (the second pipeline 19) are both in a vacuum state at this time. Under the action of vacuum, the liquid magnesium in the magnesium electrolytic cell 11 is slowly extracted as the vacuum degree increases and flows into the liquid magnesium crucible 2 through the liquid magnesium pipeline 1-2. When the monitored magnesium layer thickness reaches the lower limit, the thickness value is fed back to the distributed control system in time. After receiving the information, the distributed control system closes the second electric valve 5 and the vacuum component; at this time, the discharging is completed;

[0046] Automatic feeding: After the automatic discharging is completed, the magnesium layer liquid level measurement unit 12 is used to monitor the magnesium layer liquid level of the current magnesium electrolytic cell 11 in real time. When the monitored magnesium layer liquid level value reaches the lower limit value, the liquid level value is fed back to the distributed control system in time, and the distributed control system controls the first electric valve 10 of the magnesium chloride pipeline 1-1 of the current magnesium electrolytic cell 11 and the third electric valve in the argon component to open. After the distributed control system recognizes that the third electric valve is opened, it controls the opening of the third electric valve to allow the argon gas in the argon buffer tank 8 to enter the magnesium chloride crucible 1, and a positive pressure is gradually formed in the magnesium chloride crucible 1 to flow the magnesium chloride through the magnesium chloride pipeline 1-1 to the corresponding magnesium electrolytic cell 11; when the magnesium layer liquid level reaches the preset upper limit value, the magnesium layer liquid level measurement unit 12 feeds back the monitored liquid level value to the distributed control system in time, and the distributed control system closes the first electric valve 10 and the third electric valve, and the automatic discharging / feeding process of a magnesium electrolytic cell 11 is completed.

[0047] The automatic feeding / discharging system reduces labor and improves production efficiency by changing the traditional manual feeding and discharging methods. At the same time, the entire system is closed, avoiding the situation of impurities being carried by manual feeding, and improving the output, quality, electrolysis efficiency, and service life of equipment such as electrolytic cells of liquid magnesium. At the same time, it also reduces the waste gas generated during manual feeding and magnesium discharging operations, and its production process is more environmentally friendly and has good application prospects.

[0048] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0049] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. An automatic feeding / discharging system for a magnesium electrolytic cell, characterized in that: include: A magnesium chloride crucible (1), a liquid magnesium crucible (2) and a distributed control system; The magnesium chloride crucible (1) is connected to a plurality of magnesium electrolytic cells (11) via a magnesium chloride pipeline (1-1); the magnesium chloride pipeline (1-1) is divided into a plurality of paths; the outlet of each magnesium chloride pipeline (1-1) is connected to a corresponding magnesium electrolytic cell (11); and each magnesium chloride pipeline (1-1) is provided with a first electric valve (10); and the first electric valve (10) is connected to a distributed control system; Each of the magnesium electrolytic cells (11) is also connected to a liquid magnesium crucible (2) via a liquid magnesium pipeline (1-2), the liquid magnesium pipeline (1-2) is divided into multiple channels, and each channel of the liquid magnesium pipeline (1-2) is provided with a second electric valve (5), and the second electric valve (5) is connected to a distributed control system; each of the magnesium electrolytic cells (11) is provided with a magnesium layer thickness measuring unit (13) and a magnesium layer liquid level measuring unit (12), and both are connected to the distributed control system; The magnesium chloride pipeline (1-1) and the liquid magnesium pipeline (1-2) are respectively provided with pipeline heaters (16), and the pipeline heaters (16) are connected to a distributed control system; the magnesium chloride crucible (1) is also connected to an argon buffer tank (8) via an argon component, and the liquid magnesium crucible (2) is also connected to a vacuum buffer tank (9) via a vacuum component; the distributed control system is used to control the start and stop of the argon component and the vacuum component; and the exteriors of the magnesium chloride pipeline (1-1) and the liquid magnesium pipeline (1-2) are both provided with thermal insulation structures.

2. The automatic feeding / discharging system of the magnesium electrolytic cell according to claim 1, characterized in that: The magnesium chloride pipeline (1-1) and the liquid magnesium pipeline (1-2) both adopt double-layer hollow tubes, and the double-layer hollow tubes are composed of an inner tube and an outer tube; the pipeline heater (16) comprises a heating wire (14) wound around the outer wall of the inner tube, and the heating wire (14) is connected to a distributed control system.

3. The automatic feeding / discharging system of the magnesium electrolytic cell according to claim 2, characterized in that: The outer wall of the inner tube is also sleeved with a plurality of support rings (15), and a plurality of through holes for passing the heating wires (14) are opened along the circumference of the support rings (15).

4. The automatic feeding / discharging system of the magnesium electrolytic cell according to claim 2, characterized in that: The heating wire (14) is a nickel-chromium alloy heating wire.

5. The automatic feeding / discharging system of the magnesium electrolytic cell according to claim 1, characterized in that: The magnesium chloride crucible (1) is provided with a first feeding port (3), and the liquid magnesium crucible (2) is provided with a second feeding port (4).

6. The automatic feeding / discharging system of the magnesium electrolytic cell according to claim 1, characterized in that: Each of the magnesium electrolytic cells (11) is respectively provided with a magnesium chloride feeding port (6) and a liquid magnesium feeding port (7).

7. The automatic feeding / discharging system of the magnesium electrolytic cell according to claim 6, characterized in that: The outlet of each magnesium chloride pipeline (1-1) is connected to the magnesium chloride feeding port (6), and the outlet of each liquid magnesium pipeline (1-2) is connected to the liquid magnesium feeding port (7).

8. The automatic feeding / discharging system of the magnesium electrolytic cell according to claim 1, characterized in that: The argon gas component comprises an argon gas buffer tank (8), the argon gas buffer tank (8) is connected to the magnesium chloride crucible (1) via a first pipeline (18), a third electric valve for controlling the flow rate of argon gas is provided on the first pipeline (18), and the third electric valve is connected to a distributed control system.

9. The automatic feeding / discharging system of the magnesium electrolytic cell according to claim 1, characterized in that: The vacuum assembly comprises a vacuum buffer tank (9), a vacuum pump, a fourth electric valve and a second pipeline. The vacuum buffer tank (9) is connected to the liquid magnesium crucible (2) via the vacuum pump through the second pipeline (19). The second pipeline (19) is respectively equipped with a fourth electric valve and a flow meter. The vacuum pump and the fourth electric valve are both connected to a distributed control system.

10. The method for using the automatic feeding / discharging system of the magnesium electrolytic cell according to any one of claims 1 to 9, characterized in that: Applied to the electrolytic magnesium process in the titanium sponge production process, as follows: Automatic discharging: the magnesium layer thickness of the magnesium electrolytic cell (11) is monitored in real time by the magnesium layer thickness measuring unit (13); when the monitored magnesium layer thickness value reaches the upper limit value, the magnesium layer thickness value is fed back to the distributed control system in a timely manner; the distributed control system controls the second electric valve (5) of the liquid magnesium pipeline (1-2) of the magnesium electrolytic cell (11) corresponding to the current magnesium layer thickness measuring unit (13) to open according to the preset thickness value; when the distributed control system recognizes that the second electric valve (5) is opened, the vacuum component is started to evacuate the liquid magnesium crucible (2); under the action of vacuum, the liquid magnesium in the magnesium electrolytic cell (11) is extracted as the vacuum degree increases and flows into the liquid magnesium crucible (2) through the liquid magnesium pipeline (1-2); when the monitored magnesium layer thickness reaches the lower limit value, the thickness value is fed back to the distributed control system in a timely manner; after receiving the information, the distributed control system closes the second electric valve (5) and the vacuum component, and the discharging is completed at this time; Automatic feeding: After the discharge is completed, the magnesium layer liquid level measurement unit (12) is used to monitor the magnesium layer liquid level of the current magnesium electrolytic cell (11) in real time, and when the monitored magnesium layer liquid level value reaches the lower limit value, the magnesium layer liquid level value is promptly fed back to the distributed control system; the distributed control system controls the first electric valve (10) and the argon gas component of the magnesium chloride pipeline (1-1) of the current magnesium electrolytic cell (11) to open, and a positive pressure is formed in the magnesium chloride crucible (1) to make the magnesium chloride flow through the magnesium chloride pipeline (1-1) to the corresponding magnesium electrolytic cell (11); when the magnesium layer liquid level value reaches a preset upper limit value, the magnesium layer liquid level measurement unit (12) promptly feeds back the monitored magnesium layer liquid level value to the distributed control system, and the distributed control system closes the first electric valve (10) and the argon gas component, and the feeding is completed at this time.

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