A device for preparing high-quality magnesium chloride by vortex purification gravity separation and a preparation method thereof

Abstract

The application discloses a device for preparing high-quality magnesium chloride through vortex purification-gravity separation and a preparation method thereof, relates to the technical field of metal material preparation, and comprises a heating furnace body and an auxiliary slag discharging assembly. The auxiliary slag discharging assembly comprises a square box in communication with the bottom of a reaction container, and a first ceramic composite corrugated sleeve is connected with the second gas outlet end of the electromagnetic three-way valve through a pipeline. Through the combined process of vortex purification-gravity separation, the device can effectively remove impurities in molten magnesium chloride, the prepared high-quality magnesium chloride has low insoluble content, can meet the strict requirements of electrolytic preparation of high-purity magnesium on electrolyte, can be used as high-quality catalyst raw material, and the application range of the product is widened. The device does not need to use a large amount of expensive raw materials such as organic solvents, production cost is reduced, remarkable economic benefits are achieved, and process parameters can be flexibly adjusted according to the different impurity contents of raw materials, so that the best purification effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of metal material preparation technology, specifically to an apparatus and method for preparing high-quality magnesium chloride by eddy current purification and gravity separation. Background Technology

[0002] In the Krauer process for producing metallic titanium, magnesium chloride is produced as a byproduct during the reduction of titanium tetrachloride by metallic magnesium. This magnesium chloride can be used in molten salt electrolysis to recover and recycle the magnesium.

[0003] However, magnesium chloride often contains particulate impurities such as magnesium oxides and nitrides. These impurities can promote the growth of deposits in the electrolytic cell during molten salt electrolysis, increase the maintenance frequency of the electrolytic cell, and reduce the yield of magnesium metal. They may also reduce the purity of magnesium metal, especially when manufacturing high-purity magnesium metal, where the problem is more pronounced. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an apparatus and method for preparing high-quality magnesium chloride by eddy current purification and gravity separation, thus solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation, comprising a heating furnace body and an auxiliary slag discharge assembly. A reaction vessel is fixed inside the heating furnace body, and a slag discharge pipe is inserted through the top side of the reaction vessel. The auxiliary slag discharge assembly includes a cuboid box communicating with the bottom of the reaction vessel, and a material extraction bar is provided on one side of the cuboid box. The material extraction bar is connected to the bottom of the slag discharge pipe. The outer end of the cuboid box penetrates the heating furnace body, and a bidirectional air pump is fixed to its surface. The outlet of the bidirectional air pump is connected to an electromagnetic three-way valve via a pipe. The first outlet of the electromagnetic three-way valve is connected to an airbag box via a pipe, and a lifting door plate is provided on the upper surface of the airbag inside the airbag box. The second outlet of the electromagnetic three-way valve is connected to a first ceramic composite corrugated sleeve via a pipe, and a transmission plate is fixed to the side of the first ceramic composite corrugated sleeve away from the electromagnetic three-way valve. A horizontal partition is fixed to the top of the transmission plate.

[0006] Furthermore, the outer opening dimensions of the material extraction bar are adapted to the inner opening dimensions of the cuboid box, and the straight side of the material extraction bar is located below the arc-shaped side of the reaction vessel.

[0007] Furthermore, the airbag box is fixed to the bottom of the cuboid box, and the straight side of the lifting door plate on the top of the airbag box is located below the arc-shaped side of the reaction vessel and is opposite to the material extraction bar.

[0008] Furthermore, the horizontal partition is slidably connected to the inner wall of the cuboid box, and the outer diameter of the horizontal partition is larger than the inner diameter of the reaction vessel.

[0009] Furthermore, the top of the reaction vessel is sequentially provided with a high-purity magnesium chloride discharge pipe, an upper scum discharge pipe, and an argon gas filling port on one side of the scum discharge pipe.

[0010] Furthermore, a vortex stirring paddle is installed between the high-purity magnesium chloride discharge pipe and the upper scum discharge pipe at the center of the top surface of the reaction vessel, and the bottom heights of the scum discharge pipe, the high-purity magnesium chloride discharge pipe, the vortex stirring paddle, the upper scum discharge pipe and the argon gas filling port are arranged in a stepped manner.

[0011] Furthermore, a second ceramic composite corrugated sleeve is provided on the side of the transmission plate away from the first ceramic composite corrugated sleeve, and the second ceramic composite corrugated sleeve is connected to the first ceramic composite corrugated sleeve through a solenoid valve on the surface of the transmission plate.

[0012] Furthermore, a pusher plate is fixed on the side of the second ceramic composite corrugated sleeve away from the transmission plate, and the pusher plate is slidably connected to the bottom of the horizontal partition. An exhaust valve is provided on the side of the airbag box.

[0013] Furthermore, the outer opening dimensions of the pusher plate are adapted to the inner opening dimensions of the cuboid box, and the central axis of the pusher plate and the central axis of the pull bar are located on the same horizontal straight line.

[0014] A preparation method, applied to the aforementioned eddy current purification gravity separation apparatus for preparing high-quality magnesium chloride, the preparation method comprising the following steps: Step 1: The molten magnesium chloride is preheated and transferred to the inside of the reaction vessel. Argon gas is introduced through the argon gas inlet to form a protective atmosphere by utilizing the inert properties of argon gas to isolate the air and avoid the generation of new impurities during the purification process. Then, the rotation of the vortex stirring paddle causes the molten magnesium chloride to generate vortex, which causes the impurities to gather. After stirring, the mixture is allowed to settle. At this time, the sludge sinks into the inside of the cubic box, the scum floats on the surface of the liquid, and the middle layer is high-quality magnesium chloride. Step 2: The high-purity magnesium chloride discharge pipe and the upper scum discharge pipe can be raised and lowered inside the reaction vessel by an electric push rod. In conjunction with a laser particle size sensor, the content of insoluble matter at different heights inside the reaction vessel is detected in real time. The height of the magnesium chloride at the lowest impurity layer is used to control the raising and lowering of the bottom of the high-purity magnesium chloride discharge pipe to extract the magnesium chloride at that layer. Similarly, the height of the bottom of the upper scum discharge pipe is controlled based on the height of the liquid level surface to extract and discharge the scum on the liquid level surface. Step 3: Before the molten magnesium chloride is transferred into the reaction vessel, the first outlet of the electromagnetic three-way valve is opened, and air is injected into the airbag inside the airbag box by a two-way air pump to make it inflate and thus raise the lifting door plate. Then the first outlet is closed so that the lifting door plate remains at the same height after being raised, so that the lifting door plate divides the inside of the cube box into two spaces, and the settled sludge is located between the material extraction bar and the lifting door plate. When it is necessary to extract sludge, the second air outlet is opened, and the bidirectional air pump injects air into the first ceramic composite corrugated sleeve to make it bulge and expand, thereby pushing the transmission plate to make the horizontal partition slowly move to separate the internal space of the reaction vessel and the cuboid box. At this time, the sediment layer is located inside the cuboid box. At this time, the sludge discharge pipe extracts sludge without affecting other operations inside the reaction vessel. Step 4: After the horizontal partition moves horizontally, the pusher plate is located on one side of the lifting door. At this time, the exhaust valve on the side of the airbag box opens, allowing the gas inside the airbag to be discharged, causing the lifting door to descend. Then, the solenoid valve on the surface of the transmission plate opens, and the bidirectional air pump continues to inject air into the first ceramic composite corrugated sleeve, allowing the excess gas inside the first ceramic composite corrugated sleeve to enter the second ceramic composite corrugated sleeve. The second ceramic composite corrugated sleeve then unfolds, thereby pushing the pusher plate to move horizontally, thus pushing the remaining sludge close to the extraction bar for extraction and discharge through the sludge discharge pipe.

[0015] This invention provides an apparatus and method for preparing high-quality magnesium chloride by eddy current purification and gravity separation, which has the following beneficial effects: 1. This apparatus and method for preparing high-quality magnesium chloride by eddy current purification and gravity separation effectively removes impurities from molten magnesium chloride through a combined process of eddy current purification and gravity separation. The resulting high-quality magnesium chloride has a low insoluble content, meeting the stringent requirements for electrolytes in the electrolytic preparation of high-purity metallic magnesium. It can also be used as a high-quality catalyst raw material, broadening the application range of the product. It eliminates the need for expensive raw materials such as large amounts of organic solvents, reducing production costs and demonstrating significant economic benefits. The process parameters, such as stirring rate, stirring time, gravity separation temperature, and time, can be flexibly adjusted according to the different impurity contents in the raw materials to achieve the best purification effect, improving the process's adaptability to different raw materials.

[0016] 2. The apparatus and method for preparing high-quality magnesium chloride by eddy current purification and gravity separation, when extracting the bottom sediment, utilizes a bidirectional air pump to inject air into the first ceramic composite corrugated sleeve to push the horizontal partition to slowly move, thereby separating the internal space of the reaction vessel and the cuboid box. This allows the bottom sediment to be isolated inside the cuboid box. At this time, the suction pump generates negative pressure on the side of the suction bar, which can extract the sediment and discharge it along the sediment discharge pipe. This extraction process does not affect other extraction operations inside the reaction vessel. It avoids the problem that in traditional containers, although the bottom sediment and high-quality magnesium chloride are layered, they are in the same space, which makes it easy to extract other layers of substances due to insufficient control of the extraction power. It also solves the problem of poor efficiency caused by low-power extraction to prevent the extraction of other layers of substances.

[0017] 3. The apparatus and method for preparing high-quality magnesium chloride by eddy current purification and gravity separation, when extracting the bottom sediment, as the lifting door plate descends and the solenoid valve on the surface of the transmission plate opens, excess gas enters the second ceramic composite corrugated sleeve to cause the pusher plate to move horizontally. During the horizontal movement of the pusher plate, it gradually approaches the extraction bar and pushes the remaining sediment close to the extraction bar for extraction. This eliminates the problems of sediment residue and the limited extraction range due to the fixed position of the extraction bar. At the same time, the pusher plate and the horizontal partition move horizontally and approach the extraction bar one after the other, so that the horizontal partition can first stably separate the sediment layer and the high-quality magnesium chloride layer, avoiding the pusher plate from moving together and pushing the bottom sediment, causing it to surge. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the reaction vessel of the present invention; Figure 3 This is a schematic diagram of the internal structure of the cuboid box of the present invention; Figure 4 This is a schematic diagram of the horizontal partition structure of the present invention; Figure 5 This is a schematic diagram of the bottom structure of the cuboid box of the present invention; Figure 6 This is a schematic diagram of the first ceramic composite corrugated sleeve structure of the present invention.

[0019] In the diagram: 1. Heating furnace body; 2. Reaction vessel; 3. Slag discharge pipe; 4. Auxiliary slag discharge assembly; 401. Cube box; 402. Material extraction bar; 403. Two-way air pump; 404. Electromagnetic three-way valve; 405. Airbag box; 406. Lifting door plate; 407. First ceramic composite corrugated sleeve; 408. Transmission plate; 409. Horizontal partition; 410. Second ceramic composite corrugated sleeve; 411. Pusher plate; 5. High-purity magnesium chloride external discharge pipe; 6. Upper slag discharge pipe; 7. Argon gas filling port; 8. Vortex stirring paddle. Detailed Implementation

[0020] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0021] like Figures 1-6 As shown, the present invention provides a technical solution: an apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation, comprising a heating furnace body 1 and an auxiliary slag discharge assembly 4. A reaction vessel 2 is fixed inside the heating furnace body 1, and a slag discharge pipe 3 is provided through the top side of the reaction vessel 2. The auxiliary slag discharge assembly 4 includes a cuboid box 401 communicating with the bottom of the reaction vessel 2, and a material extraction bar 402 is provided on one side of the inside of the cuboid box 401. The material extraction bar 402 is connected to the bottom of the slag discharge pipe 3, and the outer end of the cuboid box 401 is penetrated by the heating furnace body 1. While the furnace body 1 is heated, a bidirectional air pump 403 is fixed on its surface. The air outlet of the bidirectional air pump 403 is connected to an electromagnetic three-way valve 404 via a pipe. The first air outlet of the electromagnetic three-way valve 404 is connected to an airbag box 405 via a pipe. A lifting door plate 406 is provided on the upper surface of the airbag inside the airbag box 405. The second air outlet of the electromagnetic three-way valve 404 is connected to a first ceramic composite corrugated sleeve 407 via a pipe. A transmission is fixed on the side of the first ceramic composite corrugated sleeve 407 away from the electromagnetic three-way valve 404. The moving plate 408 and the transmission plate 408 are fixed with a horizontal partition 409. The outer opening of the material extraction bar 402 is adapted to the inner opening of the cuboid box 401, and the straight side of the material extraction bar 402 is located below the arc-shaped side of the reaction vessel 2. The airbag box 405 is fixed to the bottom of the cuboid box 401, and the straight side of the lifting door plate 406 on the top of the airbag box 405 is located below the arc-shaped side of the reaction vessel 2 and is opposite to the material extraction bar 402. The horizontal partition 409 slides against the inner wall of the cuboid box 401. The connection is made so that the outer diameter of the horizontal partition 409 is larger than the inner diameter of the reaction vessel 2. The top of the reaction vessel 2 is provided with a high-purity magnesium chloride discharge pipe 5, an upper scum discharge pipe 6 and an argon gas filling port 7 in sequence on one side of the scum discharge pipe 3. A vortex stirring paddle 8 is inserted between the high-purity magnesium chloride discharge pipe 5 and the upper scum discharge pipe 6 in the middle of the top surface of the reaction vessel 2. The bottom heights of the scum discharge pipe 3, the high-purity magnesium chloride discharge pipe 5, the vortex stirring paddle 8, the upper scum discharge pipe 6 and the argon gas filling port 7 are arranged in a stepped manner. The specific operation is as follows: molten magnesium chloride is preheated and transferred to the inside of reaction vessel 2, and argon gas is introduced through argon gas inlet 7. The inertness of argon gas is used to form a protective atmosphere to isolate air and avoid the generation of new impurities during the purification process. Then, the rotation of vortex stirring paddle 8 causes molten magnesium chloride to generate vortex, which causes impurities to gather. After stirring, the mixture is allowed to settle. At this time, the sludge sinks into the inside of the cuboid box 401, the scum floats on the surface of the liquid, and the middle layer is high-quality magnesium chloride. The high-purity magnesium chloride discharge pipe 5 and the upper scum discharge pipe 6 can be raised and lowered inside the reaction vessel 2 by an electric push rod. In conjunction with a laser particle size sensor, the content of insoluble matter at different heights inside the reaction vessel 2 can be detected in real time. The height of the magnesium chloride at the lowest impurity layer is used to control the raising and lowering of the bottom of the high-purity magnesium chloride discharge pipe 5 to extract the magnesium chloride at that layer. Similarly, the height of the bottom of the upper scum discharge pipe 6 is controlled based on the height of the liquid level surface to extract and discharge the scum on the liquid level surface. Example

[0022] On the production line for preparing sponge titanium by magnesothermic reduction of titanium tetrachloride, molten magnesium chloride at approximately 750°C is transferred to reaction vessel 2 via a preheated ladle to 600°C. A high-purity graphite vortex stirrer 8 is activated, and stirring is performed at 100 r / min for 10 min to create vortices in the molten magnesium chloride, promoting impurity aggregation. After stirring, the temperature inside reaction vessel 2 is maintained at 720°C by heating furnace 1, and gravity separation is performed for 1 hour. During this time, samples are taken every 15 min to detect the insoluble content in magnesium chloride, or a laser particle size sensor is used to detect the insoluble content of each layer in real time. Once the insoluble content is stable and meets the requirements, the upper layer of high-quality magnesium chloride is extracted through the high-purity magnesium chloride discharge pipe 5 and used as the electrolyte for the electrolytic preparation of metallic magnesium. Based on the above description, this invention, through a combined process of eddy current purification and gravity separation, can effectively remove impurities from molten magnesium chloride. The resulting high-quality magnesium chloride has a low insoluble content, meeting the stringent requirements for electrolytes in the electrolytic preparation of high-purity metallic magnesium. It can also serve as a high-quality catalyst raw material, broadening the application range of the product. It eliminates the need for expensive raw materials such as large amounts of organic solvents, reducing production costs and demonstrating significant economic benefits. The process parameters, such as stirring rate, stirring time, gravity separation temperature, and time, can be flexibly adjusted according to the different impurity contents in the raw materials to achieve the best purification effect, improving the process's adaptability to different raw materials. Before the molten magnesium chloride is transferred into the reaction vessel 2, the first outlet of the electromagnetic three-way valve 404 is opened, and air is injected into the airbag inside the airbag box 405 by the bidirectional air pump 403 to make it inflate and thus raise the lifting door plate 406. Then the first outlet is closed so that the lifting door plate 406 remains at the same height after being raised, so that the lifting door plate 406 divides the inside of the cube box 401 into two spaces, so that the settled sludge is located between the material extraction bar 402 and the lifting door plate 406. When it is necessary to extract sludge, the second air outlet is opened, and the bidirectional air pump 403 injects air into the first ceramic composite corrugated sleeve 407 to make it bulge and expand, thereby pushing the transmission plate 408 to make the horizontal partition 409 slowly move to separate the internal space of the reaction vessel 2 and the cuboid box 401. At this time, the sediment layer is located inside the cuboid box 401. At this time, the sludge discharge pipe 3 extracts the sludge without affecting other operations inside the reaction vessel 2. The aforementioned sludge discharge pipe 3, high-purity magnesium chloride discharge pipe 5, and upper scum discharge pipe 6 are each independently equipped with a suction pump to extract the material from each layer, while the vortex stirring paddle 8 is driven by a drive motor. Among them, the airbag box 405 is made of high-temperature resistant heat insulation materials such as ceramic fiber, refractory brick, high-alumina heat insulation cotton, etc. Through multi-layer composite design, heat transfer is blocked, thereby achieving effective heat insulation at temperatures above 700℃ to avoid excessive heating of the airbag. The first ceramic composite corrugated sleeve 407 and the second ceramic composite corrugated sleeve 410 described below are made of ceramic fiber composite materials and can operate for a long time at temperatures above 700℃. Based on the above description, when extracting the sediment at the bottom, a bidirectional air pump 403 is used to inject air into the first ceramic composite corrugated sleeve 407 to push the horizontal partition 409 to slowly move, thereby separating the internal space of the reaction vessel 2 and the cuboid box 401. This allows the bottom sediment to be isolated inside the cuboid box 401. At this time, the suction pump generates negative pressure on the side of the suction bar 402, which can extract the sediment and discharge it along the sediment discharge pipe 3. This extraction process does not affect other extraction operations inside the reaction vessel 2. This avoids the problem that, although the bottom sediment and high-quality magnesium chloride are layered in the traditional container, they are in the same space, which makes it easy to extract other layers of material due to insufficient control of the extraction power. It also solves the problem of poor efficiency caused by low-power extraction to prevent the extraction of other layers of material.

[0023] like Figures 1-6 As shown, a second ceramic composite corrugated sleeve 410 is provided on the side of the transmission plate 408 away from the first ceramic composite corrugated sleeve 407, and the second ceramic composite corrugated sleeve 410 is connected to the first ceramic composite corrugated sleeve 407 through a solenoid valve on the surface of the transmission plate 408. A pusher plate 411 is fixed on the side of the second ceramic composite corrugated sleeve 410 away from the transmission plate 408, and the pusher plate 411 is slidably connected to the bottom of the horizontal partition 409. An exhaust valve is provided on the side of the airbag box 405. The outer opening structure size of the pusher plate 411 is adapted to the inner opening structure size of the cuboid box 401, and the central axis of the pusher plate 411 and the central axis of the extraction bar 402 are located on the same horizontal straight line. The specific operation is as follows: After the horizontal partition 409 is moved horizontally, the exhaust valve on the side of the airbag box 405 is opened, allowing the gas inside the airbag to be discharged, which causes the lifting door plate 406 to descend. Since the pusher plate 411 is already located on one side of the lifting door plate 406, liquid overflow is prevented. Then, the solenoid valve on the surface of the transmission plate 408 is opened, and the bidirectional air pump 403 continues to inject air into the first ceramic composite corrugated sleeve 407, so that the excess gas inside the first ceramic composite corrugated sleeve 407 enters the second ceramic composite corrugated sleeve 410. The second ceramic composite corrugated sleeve 410 is thus unfolded, thereby pushing the pusher plate 411 to move horizontally, thereby pushing the remaining sediment close to the extraction bar 402 so that it can be extracted and discharged through the sediment discharge pipe 3. Based on the above description, when extracting the bottom sediment, as the lifting door plate 406 descends and the electromagnetic valve on the surface of the transmission plate 408 opens, excess gas enters the second ceramic composite corrugated sleeve 410, causing the pusher plate 411 to move horizontally. During the horizontal movement of the pusher plate 411, it gradually approaches the extraction bar 402 and pushes the remaining sediment close to the extraction bar 402 for extraction. This eliminates the problems of sediment residue and the limited extraction range due to the fixed position of the extraction bar 402. At the same time, the pusher plate 411 and the horizontal partition 409 move horizontally and approach the extraction bar 402 one after the other, so that the horizontal partition 409 can first stably separate the sediment layer and the high-quality magnesium chloride layer, avoiding the pusher plate 411 from moving together and pushing the bottom sediment, causing it to surge.

[0024] A preparation method, applied to the aforementioned eddy current purification gravity separation apparatus for preparing high-quality magnesium chloride, includes the following steps: Step 1: The molten magnesium chloride is preheated and transferred to the inside of the reaction vessel 2. Argon gas is introduced through the argon gas inlet 7 to form a protective atmosphere by utilizing the inert properties of argon gas to isolate the air and avoid the generation of new impurities during the purification process. Then, the rotation of the vortex stirring paddle 8 causes the molten magnesium chloride to generate vortex, which causes the impurities to gather. After stirring, the mixture is allowed to settle. At this time, the sludge sinks into the cuboid box 401, the scum floats on the liquid surface, and the middle layer is high-quality magnesium chloride. Step 2: The high-purity magnesium chloride discharge pipe 5 and the upper scum discharge pipe 6 can be raised and lowered inside the reaction vessel 2 by an electric push rod. In conjunction with the laser particle size sensor, the content of insoluble matter at different heights inside the reaction vessel 2 is detected in real time. Based on the height of the lowest impurity layer of magnesium chloride, the bottom of the high-purity magnesium chloride discharge pipe 5 is raised and lowered to extract the magnesium chloride in that layer. Similarly, based on the height of the liquid level surface, the bottom height of the upper scum discharge pipe 6 is controlled to extract and discharge the scum on the liquid level surface. Step 3: Before the molten magnesium chloride is transferred into the reaction vessel 2, the first outlet of the electromagnetic three-way valve 404 is opened, and air is injected into the airbag inside the airbag box 405 by the bidirectional air pump 403 to make it inflate and thus raise the lifting door plate 406. Then the first outlet is closed so that the lifting door plate 406 remains at the same height after being raised, so that the lifting door plate 406 divides the inside of the cube box 401 into two spaces, so that the settled sludge is located between the material extraction bar 402 and the lifting door plate 406. When it is necessary to extract sludge, the second air outlet is opened, and the bidirectional air pump 403 injects air into the first ceramic composite corrugated sleeve 407 to make it bulge and expand, thereby pushing the transmission plate 408 to make the horizontal partition 409 slowly move to separate the internal space of the reaction vessel 2 and the cuboid box 401. At this time, the sediment layer is located inside the cuboid box 401. At this time, the sludge discharge pipe 3 extracts the sludge without affecting other operations inside the reaction vessel 2. Step 4: After the horizontal partition 409 is moved horizontally, the pusher plate 411 is located on one side of the lifting door plate 406. At this time, the exhaust valve on the side of the airbag box 405 is opened, which allows the gas inside the airbag to be discharged, causing the lifting door plate 406 to descend. Then, the solenoid valve on the surface of the transmission plate 408 is opened, and the bidirectional air pump 403 continues to inject air into the first ceramic composite corrugated sleeve 407, so that the excess gas inside the first ceramic composite corrugated sleeve 407 enters the second ceramic composite corrugated sleeve 410. The second ceramic composite corrugated sleeve 410 is thus unfolded, thereby pushing the pusher plate 411 to move horizontally, thereby pushing the remaining sludge close to the extraction bar 402 so that it can be extracted and discharged through the sludge discharge pipe 3.

[0025] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation, comprising a heating furnace body (1) and an auxiliary slag discharge assembly (4), characterized in that: The heating furnace body (1) has a reaction vessel (2) fixed inside, and a sludge discharge pipe (3) is provided at the top side of the reaction vessel (2). The auxiliary sludge discharge assembly (4) includes a cuboid box (401) connected to the bottom of the reaction vessel (2), and a material extraction strip (402) is provided on one side of the inside of the cuboid box (401). The material extraction strip (402) is connected to the bottom of the sludge discharge pipe (3). The outer end of the cuboid box (401) penetrates the heating furnace body (1), and a bidirectional air pump (403) is fixed on its surface. The outlet end of the bidirectional air pump (403) is connected to the heating furnace body (1). An electromagnetic three-way valve (404) is connected via a pipe. The first outlet of the electromagnetic three-way valve (404) is connected via a pipe to an airbag box (405). A lifting door plate (406) is provided on the upper surface of the airbag inside the airbag box (405). The second outlet of the electromagnetic three-way valve (404) is connected via a pipe to a first ceramic composite corrugated sleeve (407). A transmission plate (408) is fixed on the side of the first ceramic composite corrugated sleeve (407) away from the electromagnetic three-way valve (404). A horizontal partition plate (409) is fixed on the top of the transmission plate (408).

2. The apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation according to claim 1, characterized in that: The outer opening dimensions of the material extraction bar (402) are adapted to the inner opening dimensions of the cuboid box (401), and the straight side of the material extraction bar (402) is located below the arc-shaped side of the reaction vessel (2).

3. The apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation according to claim 1, characterized in that: The airbag box (405) is fixed to the bottom of the cuboid box (401), and the straight side of the lifting door plate (406) on the top of the airbag box (405) is located below the arc side of the reaction vessel (2) and is opposite to the material extraction bar (402).

4. The apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation according to claim 1, characterized in that: The horizontal partition (409) is slidably connected to the inner wall of the cuboid box (401), and the outer diameter of the horizontal partition (409) is larger than the inner diameter of the reaction vessel (2).

5. The apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation according to claim 1, characterized in that: The top of the reaction vessel (2) is provided with a high-purity magnesium chloride discharge pipe (5), an upper scum discharge pipe (6) and an argon gas filling port (7) in sequence on one side of the scum discharge pipe (3).

6. The apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation according to claim 5, characterized in that: A vortex agitator (8) is installed between the high-purity magnesium chloride discharge pipe (5) and the upper scum discharge pipe (6) at the center of the top surface of the reaction vessel (2), and the bottom heights of the scum discharge pipe (3), the high-purity magnesium chloride discharge pipe (5), the vortex agitator (8), the upper scum discharge pipe (6) and the argon gas filling port (7) are arranged in a stepped manner.

7. The apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation according to claim 1, characterized in that: A second ceramic composite corrugated sleeve (410) is provided on the side of the transmission plate (408) away from the first ceramic composite corrugated sleeve (407), and the second ceramic composite corrugated sleeve (410) is connected to the first ceramic composite corrugated sleeve (407) through a solenoid valve on the surface of the transmission plate (408).

8. The apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation according to claim 7, characterized in that: The second ceramic composite corrugated sleeve (410) has a pusher plate (411) fixed on the side away from the transmission plate (408), and the pusher plate (411) is slidably connected to the bottom of the horizontal partition (409). An exhaust valve is provided on the side of the airbag box (405).

9. The apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation according to claim 8, characterized in that: The outer opening dimensions of the pusher plate (411) are compatible with the inner opening dimensions of the cuboid box (401), and the central axis of the pusher plate (411) and the central axis of the pull bar (402) are on the same horizontal straight line.

10. A preparation method, applied to the apparatus for preparing high-quality magnesium chloride by eddy current purification and gravity separation as described in any one of claims 1-9, characterized in that: The preparation method includes the following steps: Step 1: The molten magnesium chloride is preheated and transferred to the inside of the reaction vessel (2), and argon gas is introduced through the argon gas filling port (7). The inertness of argon gas is used to form a protective atmosphere to isolate the air and avoid the generation of new impurities during the purification process. The rotation of the vortex stirring paddle (8) causes the molten magnesium chloride to generate vortex, which causes the impurities to accumulate. After stirring, the mixture is allowed to settle. At this time, the sludge sinks into the cube box (401), the scum floats on the liquid surface, and the middle layer is high-quality magnesium chloride. Step 2: The high-purity magnesium chloride discharge pipe (5) and the upper scum discharge pipe (6) can be raised and lowered inside the reaction vessel (2) by an electric push rod. In conjunction with the laser particle size sensor, the content of insoluble matter at different heights inside the reaction vessel (2) is detected in real time. Based on the height of the lowest impurity layer of magnesium chloride, the bottom of the high-purity magnesium chloride discharge pipe (5) is raised and lowered to extract the magnesium chloride in that layer. Similarly, based on the height of the liquid level surface, the bottom height of the upper scum discharge pipe (6) is controlled to extract and discharge the scum from the liquid level surface. Step 3: Before the molten magnesium chloride is transferred into the reaction vessel (2), the first outlet of the electromagnetic three-way valve (404) is opened, and air is injected into the airbag inside the airbag box (405) by the bidirectional air pump (403) to make it inflate and thus raise the lifting door plate (406). Then the first outlet is closed so that the lifting door plate (406) remains at the same height after being raised, so that the lifting door plate (406) divides the inside of the cube box (401) into two spaces, so that the precipitated sludge is located between the material extraction bar (402) and the lifting door plate (406). When it is necessary to extract sludge, the second air outlet is opened, and the bidirectional air pump (403) injects air into the first ceramic composite corrugated sleeve (407) to make it bulge and expand, thereby pushing the transmission plate (408) to make the horizontal partition (409) slowly move to separate the internal space of the reaction vessel (2) and the cuboid box (401). At this time, the sediment layer is located inside the cuboid box (401). At this time, the sludge discharge pipe (3) extracts sludge and does not affect other operations inside the reaction vessel (2). Step 4: After the horizontal partition (409) is translated, the pusher plate (411) is located on one side of the lifting door plate (406). At this time, the exhaust valve on the side of the airbag box (405) is opened, which allows the gas inside the airbag to be discharged, causing the lifting door plate (406) to descend. Then, the solenoid valve on the surface of the transmission plate (408) is opened, and the bidirectional air pump (403) continues to inject air into the first ceramic composite corrugated sleeve (407), so that the excess gas inside the first ceramic composite corrugated sleeve (407) enters the second ceramic composite corrugated sleeve (410). The second ceramic composite corrugated sleeve (410) is thus unfolded, thereby pushing the pusher plate (411) to translate, thereby pushing the remaining sludge close to the extraction bar (402) so that it can be extracted and discharged through the sludge discharge pipe (3).

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