Magnesium electrolysis production system

Abstract

The utility model discloses a magnesium electrolysis production system which comprises a raw material storage tank, a raw material conveying unit, a purification unit, a first conveying unit, an electrolysis unit, a second conveying unit and a casting unit which are sequentially connected, and the raw material conveying unit is used for conveying anhydrous magnesium chloride to the purification unit; the purification unit is used for melting an anhydrous magnesium chloride raw material to remove impurities so as to obtain melt magnesium chloride; the electrolysis unit is used for electrolyzing the melt magnesium chloride to obtain magnesium liquid and chlorine; the second conveying unit is used for conveying the magnesium liquid to the casting unit, and the casting unit is used for casting the magnesium liquid into magnesium ingots; the first conveying unit and the second conveying unit each comprise a two-man ladle conveying device, the magnesium electrolysis production system can effectively avoid slag grabbing operation during normal operation of the magnesium electrolysis cell, and therefore continuous production of the magnesium electrolysis cell within the service life is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of anhydrous magnesium chloride electrolytic magnesium production technology, and in particular to a magnesium electrolytic production system. Background Technology

[0002] In the process of producing metallic magnesium and chlorine by electrolysis of anhydrous magnesium chloride, anhydrous magnesium chloride is electrolyzed using direct current to produce metallic magnesium liquid, which is then cast into magnesium ingots. During the operation of the electrolytic cell, solid anhydrous magnesium chloride is added to the electrolyte in the electrolytic cell at 700°C. After the magnesium chloride melts, it is electrolyzed using direct current to produce metallic magnesium. Because the solid raw material of anhydrous magnesium chloride contains certain impurities, and in addition to the impurities generated by the electrolytic cell itself during the electrolysis process, the DC load of the entire production workshop needs to be reduced periodically every week. The electrolytic cell is switched out of the DC sequence for slag removal. After the slag removal is completed, the electrolytic cell needs to be switched back into the DC sequence. During the DC switching process, the production load changes drastically, which not only causes a large change in chlorine production, but also a large change in chlorine concentration. This causes frequent changes in the amount and concentration of chlorine supplied downstream, making it impossible for downstream users to use chlorine normally.

[0003] Furthermore, the current method of conveying anhydrous magnesium chloride using a pneumatic conveying system generates significant amounts of breakage during transport. This broken magnesium chloride dust, when added to the electrolytic cell, is drawn into subsequent processes along with chlorine gas. This not only increases the workload of downstream dust removal and cleaning equipment but also wastes raw material anhydrous magnesium chloride, increasing the consumption per ton of magnesium and consequently raising the production cost per ton of magnesium. Therefore, a new magnesium production system is needed to address these issues. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned technical problems. To achieve the above objective, this utility model adopts the following technical solution: a magnesium electrolysis production system, comprising a raw material storage tank, a raw material conveying unit, a purification unit, a first conveying unit, an electrolysis unit, a second conveying unit, and a casting unit connected in sequence. The raw material conveying unit is used to convey anhydrous magnesium chloride to the purification unit; the purification unit is used to melt and remove impurities from the anhydrous magnesium chloride raw material to obtain molten magnesium chloride; the first conveying unit is used to convey the molten magnesium chloride to the electrolysis unit; the electrolysis unit is used to electrolyze the molten magnesium chloride to obtain molten magnesium and chlorine gas; a conveying channel is provided between the electrolysis unit and the purification unit; the conveying channel is used to convey chlorine gas to the purification unit; the second conveying unit is used to convey the molten magnesium to the casting unit, and the casting unit is used to cast the molten magnesium into magnesium ingots; both the first and second conveying units include a ladle conveying device.

[0005] Specifically, the bag-lifting and conveying device includes a receiving box, the bottom of which is provided with a liquid outlet pipe. The liquid outlet pipe of the first conveying unit is connected to the purification unit, and the liquid outlet pipe of the second conveying unit is connected to the electrolysis unit.

[0006] Specifically, the raw material conveying unit includes a raw material tank conveying device, the raw material tank conveying device is provided with a discharge pipe, the electrolysis unit includes a feed pipe, the discharge pipe is provided with a first mounting joint, the feed pipe is provided with a second mounting joint that matches the discharge pipe, and the feed pipe and the discharge pipe are connected through the first mounting joint and the second mounting joint.

[0007] Specifically, the purification unit includes a melting purification furnace, an anhydrous magnesium chloride storage tank, and a carbon powder storage tank; the anhydrous magnesium chloride storage tank is connected to both the raw material conveying unit and the melting purification furnace; the carbon powder storage tank is connected to the melting purification furnace; the melting purification furnace is connected to a second conveying unit for melting anhydrous magnesium chloride to obtain molten magnesium chloride; a first feeder is provided between the anhydrous magnesium chloride storage tank and the melting purification furnace, and the first feeder is used to convey anhydrous magnesium chloride into the melting purification furnace.

[0008] Specifically, a second feeder is provided between the toner storage tank and the melting and purification furnace, and the second feeder is used to transport toner into the melting and purification furnace.

[0009] Specifically, the electrolysis unit includes an electrolytic cell and a first gas storage tank; the electrolytic cell is connected to the first conveying unit and the first gas storage tank respectively, and is used to electrolyze molten magnesium chloride to obtain magnesium liquid and chlorine gas.

[0010] Specifically, the casting unit includes a continuous refining furnace, a magnesium ingot casting machine, and a second gas storage tank; the continuous refining furnace is connected to the second conveying unit, the magnesium ingot casting machine, and the second gas storage tank respectively, and is used to refine the magnesium liquid to obtain refined metallic magnesium; a magnesium liquid pouring pump is provided between the continuous refining furnace and the magnesium ingot casting machine, and the magnesium liquid pouring pump is used to transport metallic magnesium to the magnesium ingot casting machine.

[0011] Compared with the prior art, this utility model has the following advantages:

[0012] The magnesium electrolysis production system provided by this utility model adds a raw material purification process, which pre-melts and purifies the raw materials in the melting and purification furnace, avoiding the slag removal operation during normal operation of the magnesium electrolysis cell, and enabling the magnesium electrolysis cell to produce continuously within its service life. Since the raw material added to the magnesium electrolysis cell is no longer solid anhydrous magnesium chloride particles, but purified molten magnesium chloride raw material, the chlorine gas generated by electrolysis is not mixed with anhydrous magnesium chloride dust, thus improving the cleanliness of the chlorine gas. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the system of this utility model;

[0014] Legend: 1 - Mobile feeding tanker, 2 - Melting and purification furnace, 201 - Anhydrous magnesium chloride storage tank, 3 - Ladle truck, 301 - Container box, 302 - Liquid outlet pipe, 4 - Electrolytic cell, 5 - Continuous refining furnace, 6 - Magnesium ingot casting machine, 7 - Carbon powder storage tank, 8 - Chlorine gas conveying channel, 9 - Second gas storage tank, 10 - First gas storage tank, 11 - Carbon steel pipe, 12 - Rubber hose, 13 - First feeder, 14 - Second feeder, 15 - Raw material storage tank, 16 - Magnesium liquid casting pump. Detailed Implementation

[0015] The technical solutions of the present utility model will now be clearly and completely described with reference to the accompanying drawings of the embodiments thereof:

[0016] like Figure 1 As shown, this utility model provides a technical solution: a magnesium electrolysis production system, comprising a raw material storage tank 15, a raw material conveying unit, a purification unit, a first conveying unit, an electrolysis unit, a second conveying unit, and a casting unit connected in sequence; the raw material storage tank 15 is an anhydrous magnesium chloride pneumatic conveying tank, and the raw material conveying unit includes a mobile feeding tanker 1, which is connected to a rubber hose 12 with a quick connector. Both the first and second conveying units use a bale truck 3 for conveying, and the bale truck 3 includes a receiving box 301 with a liquid outlet pipe 302 at its bottom. The purification unit includes a melting purification furnace 2, an anhydrous magnesium chloride storage tank 201, a carbon powder storage tank 7, a first feeder 13, and a second feeder 14. The anhydrous magnesium chloride storage tank 201 is connected to a carbon steel pipe 11 with a quick connector, wherein the first feeder 13 is an anhydrous magnesium chloride screw feeder, and the second feeder 14 is a carbon powder screw feeder.

[0017] In this embodiment, the electrolysis unit includes an electrolytic cell 4 and a first gas storage tank 10. The first gas storage tank 10 is an inert gas storage tank for the electrolytic cell. The electrolytic cell 4 is provided with a chlorine gas delivery channel 8, and the other end of the chlorine gas delivery channel 8 is connected to the melting and purification furnace 2.

[0018] In this embodiment, the casting unit includes a continuous refining furnace 5, a magnesium ingot casting machine 6, and a second gas storage tank 9. The second gas storage tank 9 is an inert gas storage tank for the refining furnace. A magnesium liquid pouring pump 16 is provided between the continuous refining furnace 5 and the magnesium ingot casting machine 6.

[0019] The process for preparing magnesium ingots using the magnesium electrolysis production system provided in this embodiment includes:

[0020] First, the raw material storage tank 15 transports anhydrous magnesium chloride granules to the mobile conveyor truck 1, connecting the rubber hose 12 with a quick-connect coupling to the carbon steel pipe 11 with a quick-connect coupling. The mobile conveyor truck 1 then transports the anhydrous magnesium chloride granules to the anhydrous magnesium chloride storage tank 201. The discharge pipe is the rubber hose 12, and the inlet pipe is the carbon steel pipe 11. Using the mobile conveyor truck to transport anhydrous magnesium chloride, the truck uses the rubber hose 12 for loading and unloading. During loading and unloading operations, the corresponding pipes can be quickly connected, making the operation convenient and fast. Using the truck to transport anhydrous magnesium chloride raw materials minimizes the breakage rate of the granules.

[0021] Anhydrous magnesium chloride and carbon powder in the anhydrous magnesium chloride storage tank 201 and the carbon powder storage tank 7 are conveyed to the melting and purification furnace 2 through the first feeder 13 and the second feeder 14. The anhydrous magnesium chloride particles are melted in the melting and purification furnace 2 to obtain molten magnesium chloride after removing impurities. The first feeder 13 is an anhydrous magnesium chloride screw feeder and the second feeder 14 is a carbon powder screw feeder.

[0022] In this embodiment, the feeding process to the melting and purification furnace adopts a screw weighing feeder, which provides precise feeding. The feed rate and the mixed gas intake rate of the melting and purification furnace are interlocked and sequentially controlled, which can automatically adjust the amount of air-mixed gas added according to the feed rate, thereby minimizing the amount of tail gas emissions containing chlorine.

[0023] In this embodiment, carbon powder and chlorine gas (the chlorine gas used is produced by the electrolytic cell itself and does not need to be purchased externally) are added during the melting process. This causes some impurities such as magnesium oxide, sulfate, iron oxide, aluminum oxide, and silicon oxide in the anhydrous magnesium chloride particles to react. The magnesium oxide is chlorinated and melted to form magnesium chloride for use in subsequent electrolysis processes. The sulfur dioxide, iron oxide, aluminum oxide, and silicon oxide generated in the reaction are vaporized and discharged with the tail gas at a high temperature of 800°C, thus purifying the molten magnesium chloride and effectively ensuring the purity and quality of the raw materials for the next electrolytic cell. At the same time, the dust and slag generated from the melting of anhydrous magnesium chloride are collected and treated in the melting and purification furnace to prevent them from being introduced into electrolytic cell 4 and affecting its normal production.

[0024] After the molten material has been left to stand for a period of time, it is transported to the electrolytic cell 4 by a trolley 3. The molten magnesium chloride enters the electrolytic cell 4 through the liquid outlet pipe 302 at the bottom of the trolley's container 301. Inert gas is introduced into the electrolytic cell 4 through the first gas storage tank 10 to electrolyze the molten magnesium chloride, resulting in magnesium liquid and chlorine gas. The chlorine gas is returned to the melting and purification furnace 2 through the chlorine gas conveying channel 8 for use.

[0025] In this embodiment, since purified molten magnesium chloride is added to the electrolytic cell 4, and the impurities in the solid raw materials are treated in the melting and purification furnace, very few impurities are generated in the electrolytic cell 4. The electrolytic cell 4 does not need to be scraped during its service life and can produce continuously and stably under the same current. The chlorine production and concentration can be continuously and stably maintained within a certain range, which is convenient for downstream use. In addition, the powder generated from the crushing of raw materials is treated during the melting and purification furnace, so the chlorine cleanliness is improved.

[0026] In this embodiment, the electrolyte and magnesium are transferred using a bottom-pumped, bottom-discharged pump. Because the bottom-pumped, bottom-discharged pump reduces the height at which the electrolyte and magnesium liquid are drawn up, it is less likely to become clogged under a fixed vacuum negative pressure.

[0027] In this embodiment, the electrolytic cell 4 is protected by an inert gas during production, which prevents magnesium from oxidizing and burning upon contact with air, and greatly improves the current efficiency of the electrolytic cell 4.

[0028] Molten magnesium is transported to a continuous refining furnace 5 using a trolley 3. Inert gas is introduced through a second gas storage tank 9 to refine the molten magnesium, resulting in high-purity molten magnesium. This high-purity molten magnesium is then pumped into a magnesium ingot casting machine 6 using a molten magnesium casting pump 16 to cast magnesium ingots. The use of inert protective gas during casting ensures the appearance quality of the cast magnesium ingots and significantly reduces the loss rate during casting, thus lowering the cost per ton of magnesium.

[0029] The magnesium electrolysis production system provided by this invention pre-melts and purifies anhydrous magnesium chloride particles in a melting and purification furnace 2 before adding them to the electrolytic cell 4. This adds a raw material impurity removal and purification process, eliminating the need for slag removal during normal operation of the magnesium electrolytic cell and ensuring continuous production throughout its service life. Since the raw material added to the magnesium electrolytic cell is no longer solid anhydrous magnesium chloride particles, but purified molten magnesium chloride, the chlorine gas produced by electrolysis is free of anhydrous magnesium chloride dust, significantly improving the cleanliness of the chlorine gas.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A magnesium electrolytic production system comprising, in series, a raw material storage tank (15), a raw material transport unit, a purification unit, a first transport unit, an electrolysis unit, a second transport unit, and a casting unit, characterized by: The raw material conveying unit is used for conveying anhydrous magnesium chloride to the purification unit; the purification unit is used for removing impurities by melting the anhydrous magnesium chloride raw material to obtain molten magnesium chloride; the first conveying unit is used for conveying the molten magnesium chloride to the electrolysis unit; the electrolysis unit is used for electrolyzing the molten magnesium chloride to obtain magnesium liquid and chlorine gas; the electrolysis unit is provided with a conveying channel between the purification unit; the conveying channel is used for conveying chlorine gas to the purification unit; the second conveying unit is used for conveying the magnesium liquid to the casting unit, and the casting unit is used for casting the magnesium liquid into magnesium ingots; the first conveying unit and the second conveying unit each comprise a ladle conveying device.

2. A magnesium electrolysis production system according to claim 1, characterized in that: The ladle conveying device comprises a containing box (301), and the bottom of the containing box (301) is provided with a liquid outlet pipe (302); the liquid outlet pipe (302) of the first conveying unit is connected with the purification unit; and the liquid outlet pipe (302) of the second conveying unit is connected with the electrolysis unit.

3. A magnesium electrolysis production system according to claim 1, characterized in that: The raw material conveying unit comprises a raw material tank conveying device provided with a discharging pipe; the electrolysis unit comprises a feeding pipe; the discharging pipe is provided with a first mounting joint; the feeding pipe is provided with a second mounting joint matched with the discharging pipe; and the feeding pipe and the discharging pipe are connected through the first mounting joint and the second mounting joint.

4. A magnesium electrolysis production system according to claim 1, characterized in that: The purification unit comprises a melting and purifying furnace (2), an anhydrous magnesium chloride storage tank (201) and a carbon powder storage tank (7); the anhydrous magnesium chloride storage tank (201) is connected with the raw material conveying unit and the melting and purifying furnace (2) respectively; the carbon powder storage tank (7) is connected with the melting and purifying furnace; the melting and purifying furnace (2) is connected with the second conveying unit and is used for melting the anhydrous magnesium chloride to obtain molten magnesium chloride; and a first feeding machine (13) is arranged between the anhydrous magnesium chloride storage tank (201) and the melting and purifying furnace (2), and the first feeding machine (13) is used for conveying the anhydrous magnesium chloride into the melting and purifying furnace (2).

5. A magnesium electrolysis production system according to claim 4, characterized in that: A second feeding machine (14) is arranged between the carbon powder storage tank (7) and the melting and purifying furnace (2), and the second feeding machine (14) is used for conveying the carbon powder into the melting and purifying furnace (2).

6. A magnesium electrolysis production system according to claim 1, characterized in that: The electrolysis unit comprises an electrolytic cell (4) and a first gas storage tank (10); the electrolytic cell (4) is connected with the first conveying unit and the first gas storage tank (10) respectively.

7. A magnesium electrolysis production system according to claim 1, characterized in that: The casting unit comprises a continuous refining furnace (5), a magnesium ingot casting machine (6) and a second gas storage tank (9); the continuous refining furnace (5) is connected with the second conveying unit, the magnesium ingot casting machine (6) and the second gas storage tank (9) respectively; a magnesium liquid pouring pump (16) is arranged between the continuous refining furnace (5) and the magnesium ingot casting machine (6); and the magnesium liquid pouring pump (16) is used for conveying the metal magnesium to the magnesium ingot casting machine (6).

Images