Device for preparing high-purity magnesium ingot through multi-stage vacuum distillation

Abstract

The utility model relates to the technical field of metal purification equipment, and aims to solve the technical problems of low production efficiency, complicated equipment operation and the like. In order to solve the technical problem, the utility model provides the device for preparing the high-purity magnesium ingot through multi-stage vacuum distillation. According to the utility model, a vacuumizing part of a vacuum system is connected with a vacuum chamber; the crucible system is arranged in the vacuum chamber; the crucible system comprises a distillation crucible, a first collection crucible and a second collection crucible which are communicated in sequence; a first wind shield which is vertically arranged is arranged in the first collecting crucible; a second wind shield which is vertically arranged is arranged in the second collecting crucible; the working temperature of the first collecting crucible is higher than that of the second collecting crucible; a distillation crucible heating furnace of the heating system wraps a distillation crucible, a first collection crucible heating furnace wraps a first collection crucible, and a second collection crucible heating furnace wraps a second collection crucible. The device is simple in structure and convenient to operate, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal purification equipment technical field, especially is a kind of device for preparing high-purity magnesium ingot by multistage vacuum distillation. BACKGROUND

[0002] High-purity magnesium is the key raw material required in the high-tech fields of semiconductor, new energy battery, biological medicine and the like.

[0003] The raw magnesium with 99.9% (3N) purity contains a large amount of impurity elements such as Fe, Cu, Si, Al, Zn and Mn. The impurity elements form a primary cell corrosion with the magnesium matrix, significantly reducing the performance of magnesium devices and limiting their use in high-tech fields. With the rapid development of high-tech industries, the demand for high-purity magnesium is increasing.

[0004] The current mainstream vacuum distillation purification equipment is a vertical distillation column composed of a series of crucibles and baffles. By setting different temperatures and pressures and utilizing the difference in condensation temperature of different elements, magnesium and impurity elements are separated. In some crucibles, particulate or thin strip-shaped crystalline magnesium with a purity higher than 99.999% can be collected. However, the traditional vacuum distillation method for preparing high-purity magnesium generally has the following problems: (1) Difficulty in collecting distillation products. Magnesium vapor directly sublimes into solid phase in the form of fine particles or thin strips, which adhere to the inner wall of the crucible and the baffle, making collection difficult; (2) The specific surface area of magnesium distillation products is large, and the activity is high, which is easy to oxidize. After breaking the vacuum, the surface of high-purity magnesium is easy to oxidize, and in the subsequent remelting process, the oxides will enter the magnesium ingot as inclusions, affecting the purity and performance of the product; (3) The distillation products need to be remelted to prepare magnesium ingots, which has a long process and high cost.

[0005] In order to solve the problems existing in the traditional vacuum distillation technology, researchers have tried to directly prepare high-purity magnesium ingots by vacuum distillation method. For example, the Chinese invention patent with publication number CN106636664A discloses a device and method for preparing high-purity magnesium ingots by vacuum distillation. The distillation device places a collection crucible in the distillation crucible, and magnesium vapor enters the collection crucible to directly condense into high-purity magnesium ingots, solving the problem of difficult collection of products in the traditional distillation device. However, this device can only remove impurity elements with low saturated vapor pressure, and it is difficult to remove impurity elements with higher vapor pressure than magnesium.

[0006] As can be seen, the existing equipment for preparing high-purity magnesium ingots either has a complex structure, a cumbersome operation process and low production efficiency, or the purity of high-purity magnesium ingots is not high. Therefore, it is urgent to develop new equipment for preparing high-purity magnesium ingots to improve the production efficiency of high-purity magnesium ingots to meet the demand for high-purity magnesium in high-tech fields. UTILITY MODEL CONTENTS

[0007] To this end, the utility model wants to solve the technical problem in prior art in the above.

[0008] To solve the above technical problems, the utility model provides a kind of high-purity magnesium ingot preparation device of multistage vacuum distillation, comprising:

[0009] Vacuum system, including vacuum chamber and vacuum component;Vacuum component is connected with vacuum chamber, for extracting gas in vacuum chamber;

[0010] Crucible system, is located in vacuum chamber;Crucible system includes the distillation crucible, first collection crucible and second collection crucible communicated in sequence;First collection crucible is equipped with the first windbreak of vertical arrangement, for slowing down the flow rate of magnesium vapor entering first collection crucible;Second collection crucible is equipped with the second windbreak of vertical arrangement, for slowing down the flow rate of magnesium vapor entering second collection crucible;The working temperature of first collection crucible is higher than the working temperature of second collection crucible;

[0011] Heating system, including distillation crucible heating furnace, first collection crucible heating furnace and second collection crucible heating furnace;Distillation crucible heating furnace covers distillation crucible, first collection crucible heating furnace covers first collection crucible, and second collection crucibble heating furnace covers second collection crucibble.

[0012] In an embodiment of the utility model, filter screen is equipped in distillation crucible, and the magnesium vapor formed by distillation in distillation crucible enters first collection crucible after passing through filter screen.

[0013] In an embodiment of the utility model, the working temperature of distillation crucible is 700~725 ℃;The working temperature of first collection crucible is 630 ℃~650 ℃;The working temperature of second collection crucible is 570 ℃~590 ℃.

[0014] In an embodiment of the utility model, distillation crucible and first collection crucible are detachably connected by first connecting pipe;First collection crucible and second collection crucible are detachably connected by second connecting pipe.

[0015] In an embodiment of the utility model, the top end of first windbreak is higher than the top end of first connecting pipe;The bottom end of first windbreak is lower than the bottom end of first connecting pipe;The top end of second windbreak is higher than the top end of second connecting pipe;The bottom end of second windbreak is lower than the bottom end of second connecting pipe.

[0016] In an embodiment of the utility model, vacuum system further includes inert gas protection component;Inert gas protection component is connected with vacuum chamber, and inert gas protection component is configured to input inert gas into vacuum chamber.

[0017] In an embodiment of the utility model, inert gas protection part includes high -purity gas bottle, high -purity gas bottle is connected with vacuum chamber through gas connecting pipe, and is equipped with flowmeter on gas connecting pipe.

[0018] In an embodiment of the utility model, the application further includes a temperature control system, which is connected with the distillation crucible heating furnace, the first collection crucible heating furnace, the second collection crucible heating furnace, the first connecting pipe heating furnace and the second connecting pipe heating furnace respectively.

[0019] In an embodiment of the utility model, the vacuumizing part includes a vacuum pump and a vacuum valve; the vacuum pump is connected with the vacuum chamber through a corrugated pipe, and the vacuum valve is arranged on the corrugated pipe.

[0020] In an embodiment of the utility model, the vacuum system further includes a pressure gauge connected with the vacuum chamber for monitoring the pressure of the vacuum chamber.

[0021] The above technical scheme of the utility model has the following advantages compared with the prior art:

[0022] The device for preparing high-purity magnesium ingots by multi-stage vacuum distillation has the distillation crucible, the first collection crucible and the second collection crucible connected in sequence, and the first baffle is arranged in the first collection crucible and the second baffle is arranged in the second collection crucible. The magnesium ingots placed in the distillation crucible are subjected to vacuum distillation to form magnesium vapor entering the first collection crucible and the second collection crucible, and in this process, the first baffle and the second baffle slow down the flow rate of the magnesium vapor, and then the temperature and the pressure are controlled, so that different saturated vapor pressure metal impurities in the raw magnesium are separated, and the high-purity magnesium ingots are collected in the first collection crucible, instead of the granular product obtained by the traditional vacuum distillation technology. The device only has the distillation crucible, the first collection crucible and the second collection crucible, has a simple structure, is easy to operate, can directly prepare the high-purity magnesium ingots, and improves the production efficiency. The device solves the problems of the prior art, such as complex equipment for preparing high-purity magnesium ingots, low purity, long process flow and complex operation. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to make the content of the utility model more easily understood clearly, the utility model is further explained in detail below according to the specific embodiments of the utility model and in combination with the drawings, wherein:

[0024] Figure 1 is a structure schematic view of the device for preparing high-purity magnesium ingots by multi-stage vacuum distillation in the preferred embodiment of the utility model;

[0025] Figure 2 is Figure 1 the A-A sectional view of the device for preparing high-purity magnesium ingots by multi-stage vacuum distillation;

[0026] Figure 3 The GDMS component detection result of the high-purity magnesium ingot prepared by the device.

[0027] The description of the drawings is as follows: 100, vacuum system; 110, vacuum chamber; 120, vacuum extraction component; 121, vacuum pump; 122, vacuum valve; 123, corrugated pipe; 130, inert gas protection component; 131, high-purity gas cylinder; 132, gas connecting pipe; 133, flow meter; 140, pressure gauge;

[0028] 200, crucible system; 210, distillation crucible; 211, filter screen; 212, distillation crucible upper cover; 213, distillation crucible heat insulation cover; 220, first collection crucible; 221, first wind shield; 222, first collection crucible upper cover; 223, first collection crucible heat insulation cover; 230, second collection crucible; 231, second wind shield; 232, second collection crucible upper cover; 233, second collection crucible heat insulation cover; 240, first connecting pipe; 250, second connecting pipe;

[0029] 300, heating system; 310, distillation crucible heating furnace; 320, first collection crucible heating furnace; 330, second collection crucible heating furnace; 340, first connecting pipe heating furnace; 350, second connecting pipe heating furnace;

[0030] 400, temperature control system;

[0031] 500, original magnesium ingot. DETAILED DESCRIPTION

[0032] The utility model will be further explained in combination with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0033] Referring to Figures 1-2 The utility model discloses a kind of devices for preparing high-purity magnesium ingot by multistage vacuum distillation, comprising:

[0034] Vacuum system 100, including vacuum chamber 110 and vacuum extraction component 120;Vacuum extraction component 120 is connected with vacuum chamber 110, for extracting gas in vacuum chamber 110;

[0035] The crucible system 200 is arranged in the vacuum chamber 110, and comprises, in sequence, a distillation crucible 210, a first collection crucible 220, and a second collection crucible 230. The first collection crucible 220 is provided with a first wind baffle 221 arranged vertically, for slowing down the flow rate of magnesium vapor entering the first collection crucible 220. The second collection crucible 230 is provided with a second wind baffle 231 arranged vertically, for slowing down the flow rate of magnesium vapor entering the second collection crucible 230. The working temperature of the first collection crucible 220 is higher than that of the second collection crucible 230.

[0036] The heating system 300 comprises a distillation crucible heating furnace 310, a first collection crucible heating furnace 320, and a second collection crucible heating furnace 330. The distillation crucible heating furnace 310 covers the distillation crucible 210, the first collection crucible heating furnace 320 covers the first collection crucible 220, and the second collection crucible heating furnace 330 covers the second collection crucible 230. Each of the heating furnaces is of a resistance heating type.

[0037] Specifically, the present embodiment is provided with a multi-stage vacuum distillation, i.e., the distillation crucible 210, the first collection crucible 220, and the second collection crucible 230 are connected in sequence, and the first wind baffle 221 is arranged in the first collection crucible 220, and the second wind baffle 231 is arranged in the second collection crucible 230. The raw magnesium ingot 500 placed in the distillation crucible 210 is subjected to vacuum distillation to form magnesium vapor entering the first collection crucible 220 and the second collection crucible 230. In this process, the first wind baffle 221 and the second wind baffle 231 slow down the flow rate of the magnesium vapor entering, and then the temperature and pressure are controlled, so as to separate different saturated vapor pressure metal impurities in the raw magnesium, and the high-purity magnesium ingot is collected in the first collection crucible 220. The high-purity magnesium ingot is in a block structure rather than a granular structure, and is convenient to collect. The present application only has the distillation crucible 210, the first collection crucible 220, and the second collection crucible 230, which are simple in structure, convenient to operate, and can directly prepare the high-purity magnesium ingot, thereby improving the production efficiency. The present application solves the problems of the prior art, such as complex purification equipment for preparing the high-purity magnesium ingot, low purity, long process flow, and complex operation.

[0038] Further, the distillation crucible 210 is provided with a filter screen 211, and the magnesium vapor formed by distillation in the distillation crucible 210 enters the first collection crucible 220 after passing through the filter screen 211. In some possible embodiments, the filter screen 211 is arranged lower than the first side hole (described below). Specifically, the filter screen 211 in the present embodiment can filter out large-size oxides and other inclusions in the magnesium vapor formed after distillation, and further improve the purification effect.

[0039] Further, the working temperature of the distillation crucible 210 is 700-725℃; the working temperature of the first collection crucible 220 is 630℃-650℃; and the working temperature of the second collection crucible 230 is 570℃-590℃. Specifically, since the melting point of magnesium is 650℃, the working temperature of the distillation crucible 210 in the embodiment is 700-725℃, which can melt the raw magnesium ingot 500 to form magnesium vapor. The working temperature of the first collection crucible 220 in the embodiment is 630℃-650℃, and the working temperature of the second collection crucible 230 is 570℃-590℃, which is more conducive to separating magnesium and metal impurities while ensuring the cost; thus, the purification effect of the embodiment is better, and the cost is low.

[0040] The application utilizes the difference in vapor pressure of various elements and the difference in condensation temperature to effectively separate different saturated vapor pressure metal impurity elements in raw magnesium and directly prepare large-size high-purity magnesium ingots. The utility model has the advantages of simple structure, convenient operation, and easy scale production.

[0041] Further, the distillation crucible 210 is detachably connected with the first collection crucible 220 through the first connecting pipe 240; and the first collection crucible 220 is detachably connected with the second collection crucible 230 through the second connecting pipe 250. In some possible embodiments, the distillation crucible 210 is provided with a first side hole at a position close to the top end on one side; the first collection crucible 220 is provided with a second side hole and a third side hole at the top on both sides, respectively; and the second collection crucible 230 is provided with a fourth side hole at the top on one side. The second side hole and the first side hole are connected through the first connecting pipe 240; and the third side hole and the fourth side hole are connected through the second connecting pipe 250. The heating system 300 further comprises a first connecting pipe heating furnace 340 and a second connecting pipe heating furnace 350; the first connecting pipe heating furnace 340 covers the first connecting pipe 240, and the second connecting pipe heating furnace 350 covers the second connecting pipe 250. The temperature control system 400 (described below) is further connected with the first connecting pipe heating furnace 340 and the second connecting pipe heating furnace 350, respectively. Specifically, the detachable connection of the distillation crucible 210 with the first collection crucible 220 and the first collection crucible 220 with the second collection crucible 230 can be realized in the embodiment, so as to facilitate the quick installation and disassembly of the two. The utility model adopts modular design, is easy to assemble and disassemble, is convenient for sampling and cleaning, and is easy to realize scale production.

[0042] Further, the top end of the first baffle 221 is higher than the top end of the first connecting pipe 240; the bottom end of the first baffle 221 is lower than the bottom end of the first connecting pipe 240; the top end of the second baffle 231 is higher than the top end of the second connecting pipe 250; the bottom end of the second baffle 231 is lower than the bottom end of the second connecting pipe 250. Specifically, the first baffle 221 of the embodiment can block all magnesium vapor entering the first collection crucible 220, further improving the effect of slowing down the flow rate of magnesium vapor. The second baffle 231 has the same effect, which will not be described here.

[0043] Further, the distillation crucible 210 comprises a distillation crucible body and a distillation crucible upper cover 212 which is openably connected to the top of the distillation crucible body; the first collection crucible 220 comprises a first collection crucible body and a first collection crucible upper cover 222 which is openably connected to the top of the first collection crucible body; the second collection crucible 230 comprises a second collection crucible body and a second collection crucible upper cover 232 which is openably connected to the top of the second collection crucible body.

[0044] Specifically, the embodiment can add the raw magnesium ingot 500 by opening the top distillation crucible upper cover 212; the embodiment can collect high-purity magnesium ingots in the first collection crucible 220 by opening the first collection crucible upper cover 222; the embodiment can collect metal impurities in the second collection crucible 230 by opening the second collection crucible upper cover 232. As can be seen, the embodiment is convenient and efficient to operate.

[0045] Since the top of each of the distillation crucible 210, the first collection crucible 220 and the second collection crucible 230 can be opened. If a heating furnace is covered on the top, on the one hand, the construction difficulty is relatively large, on the other hand, it is easy to damage and increase maintenance cost. In order to solve this problem, further, the distillation crucible heating furnace 310 is wrapped on the bottom and the outer wall of the four sides of the distillation crucible 210; the distillation crucible upper cover 212 is provided with a distillation crucible heat insulation cover 213 on the outer wall; the first collection crucible heating furnace 320 is wrapped on the bottom and the outer wall of the four sides of the first collection crucible 220; the first collection crucible upper cover 222 is provided with a first collection crucible heat insulation cover 223 on the outer wall; the second collection crucible heating furnace 330 is wrapped on the bottom and the outer wall of the four sides of the second collection crucible 230; the second collection crucible upper cover 232 is provided with a second collection crucible heat insulation cover 233 on the outer wall. In some embodiments, the material of the distillation crucible heat insulation cover 213, the first collection crucible heat insulation cover 223 and the second collection crucible heat insulation cover 233 is the same. For example, the distillation crucible heat insulation cover 213, the first collection crucible heat insulation cover 223 and the second collection crucible heat insulation cover 233 are all made of ceramic material. Specifically, the embodiment reduces the operation difficulty of the heating system 300 while ensuring the temperature of the crucible system 200, and reduces the cost.

[0046] Since the pressure in the vacuum chamber 110 is 0.1-10 Pa after the vacuum is drawn in the present application, and magnesium is relatively active, it will react with oxygen in the air and the like, thereby affecting the purity of the prepared high-purity magnesium ingot. In order to solve this problem, further, the vacuum system 100 further comprises an inert gas protection component 130. The inert gas protection component 130 is connected with the vacuum chamber 110, and the inert gas protection component 130 is configured to input inert gas into the vacuum chamber 110. In some embodiments, considering economy, the inert gas protection component 130 inputs argon into the vacuum chamber 110.

[0047] In some possible implementations, the inert gas protection component 130 comprises a high-purity gas cylinder 131, the high-purity gas cylinder 131 is connected with the vacuum chamber 110 through a gas connection pipe 132, and a flow meter 133 is arranged on the gas connection pipe 132. Specifically, after the preliminary vacuum is drawn; then the inert gas is input into the vacuum chamber 110, repeated for several times, and then vacuum is drawn again, so that the air in the vacuum chamber 110 is washed out, so that the gas in the vacuum chamber 110 will not react with magnesium, and the purification effect is further improved.

[0048] Further, the present application also comprises a temperature control system 400, which is connected with the distillation crucible heating furnace 310, the first collection crucible heating furnace 320, the second collection crucible heating furnace 330, the first connection pipe heating furnace 340 and the second connection pipe heating furnace 350 respectively. Specifically, the temperature of each heating furnace can be independently controlled by the temperature control system 400, and the temperature control system 400 controls the temperature of the distillation crucible heating furnace 310, the first collection crucible heating furnace 320, the second collection crucible heating furnace 330, the first connection pipe heating furnace 340 and the second connection pipe heating furnace 350 respectively. In some embodiments, the temperature control system 400(41) independently controls the temperature of each heating furnace through a thermocouple.

[0049] Further, the vacuum drawing component 120 comprises a vacuum pump 121 and a vacuum valve 122; the vacuum pump 121 is connected with the vacuum chamber 110 through a corrugated pipe 123, and the vacuum valve 122 is arranged on the corrugated pipe 123. Specifically, the gas in the vacuum chamber 110 is pumped out by the vacuum pump 121, and the structure is stable and reliable.

[0050] Further, the vacuum system 100 further comprises a pressure gauge 140, which is connected with the vacuum chamber 110 and is used for monitoring the pressure of the vacuum chamber 110. Specifically, the pressure of the vacuum chamber 110 can be detected in the present embodiment, so as to ensure that the pressure of the vacuum chamber 110 reaches the requirement.

[0051] In some embodiments, the distillation crucible 210, the first collection crucible 220, the second collection crucible 230, and the baffle are made of high-purity graphite.

[0052] The preparation process of the high-purity magnesium ingot by using the present application is as follows:

[0053] Treatment of the raw magnesium (3N4) ingot: a cylindrical magnesium ingot is cut from the raw magnesium ingot 500, the surface of the magnesium ingot is polished to remove the surface oxides, the magnesium ingot is cleaned with acetone, and then is dried and placed in the distillation crucible 210.

[0054] Vacuumizing: the vacuum chamber 110 is vacuumized to 0.1 Pa by using the vacuum pump 121. Then, high-purity (99.999%) argon is introduced into the vacuum chamber 110 through the high-purity gas bottle 131 and the gas connecting pipe 132 until the pressure in the vacuum chamber 110 is 0.9 atm, and this process is repeated for multiple times (for example, 3 times). Finally, the vacuumizing is performed to 0.1 Pa.

[0055] Purification: the distillation crucible 210, the first collection crucible 220, the second collection crucible 230, the first connecting pipe 240, and the second connecting pipe 250 are heated to the respective target temperatures (wherein the distillation crucible 210 is 700 ℃, the first connecting pipe 240 is 700 ℃, the first collection crucible 220 is 640 ℃, the second connecting pipe 250 is 640 ℃, and the second collection crucible 230 is 580 ℃) by using the temperature control system 400. After the distillation is completed, the temperature control system 400 is turned off.

[0056] Collecting the distillation products: when the temperature of the crucible system 200 decreases to room temperature, high-purity argon is introduced into the vacuum chamber 110, the furnace door of the vacuum chamber 110 is opened, and the distillation products in the crucibles are collected. The high-purity magnesium ingot is obtained in the first collection crucible 220.

[0057] The present application simplifies the equipment and operation steps, and improves the production efficiency.

[0058] The high-purity magnesium ingot prepared by using the present application is subjected to GDMS composition detection, and the detection results are shown in the following table: Figure 3 The detection results can be used to evaluate the distillation purification effect (the content of the removed metal impurity elements, and the purity of the high-purity magnesium is 99.996%).

[0059] It should be noted that: in order to further purify the magnesium ingot, the high-purity magnesium ingot collected in the first collection crucible 220 is transferred into the distillation crucible 210, and then is subjected to secondary distillation, so that a high-purity magnesium ingot with higher purity can be obtained. The present application can quickly and conveniently perform secondary distillation on the high-purity magnesium ingot, realizes preparation of a high-purity magnesium ingot with higher purity, and meets the requirements of the medical, semiconductor, and new energy battery fields on the purity of magnesium.

[0060] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments are not required to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A device for preparing high-purity magnesium ingots by multi-stage vacuum distillation, characterized in that: include: A vacuum system comprising a vacuum chamber and a vacuum pumping component; the vacuum pumping component is connected to the vacuum chamber and is used to extract gas from the vacuum chamber; A crucible system is provided in the vacuum chamber; the crucible system includes a distillation crucible, a first collecting crucible, and a second collecting crucible connected in sequence; the first collecting crucible is provided with a first vertically arranged windshield for slowing down the flow rate of magnesium vapor entering the first collecting crucible; the second collecting crucible is provided with a second vertically arranged windshield for slowing down the flow rate of magnesium vapor entering the second collecting crucible; the operating temperature of the first collecting crucible is higher than the operating temperature of the second collecting crucible; A heating system comprising a distillation crucible heating furnace, a first collecting crucible heating furnace, and a second collecting crucible heating furnace; The distillation crucible heating furnace covers the distillation crucible, the first collecting crucible heating furnace covers the first collecting crucible, and the second collecting crucible heating furnace covers the second collecting crucible.

2. The device for preparing high-purity magnesium ingots by multi-stage vacuum distillation according to claim 1, characterized in that: A filter screen is provided in the distillation crucible, and magnesium vapor formed by distillation in the distillation crucible passes through the filter screen and then enters the first collecting crucible.

3. The device for preparing high-purity magnesium ingots by multi-stage vacuum distillation according to claim 1, characterized in that: The working temperature of the distillation crucible is 700-725°C; the working temperature of the first collection crucible is 630-650°C; and the working temperature of the second collection crucible is 570-590°C.

4. The device for preparing high-purity magnesium ingots by multi-stage vacuum distillation according to claim 1, characterized in that: The distillation crucible and the first collecting crucible are detachably connected via a first connecting tube; the first collecting crucible and the second collecting crucible are detachably connected via a second connecting tube.

5. The device for preparing high-purity magnesium ingots by multi-stage vacuum distillation according to claim 4, characterized in that: The top of the first wind shield is higher than the top of the first connecting tube; the bottom of the first wind shield is lower than the bottom of the first connecting tube; the top of the second wind shield is higher than the top of the second connecting tube; the bottom of the second wind shield is lower than the bottom of the second connecting tube.

6. The device for preparing high-purity magnesium ingots by multi-stage vacuum distillation according to claim 1, characterized in that: All crucibles are made of high-purity graphite.

7. The device for preparing high-purity magnesium ingots by multi-stage vacuum distillation according to claim 1, characterized in that: The vacuum system further includes an inert gas protection component; the inert gas protection component is connected to the vacuum chamber, and the inert gas protection component is configured to input inert gas into the vacuum chamber.

8. The device for preparing high-purity magnesium ingots by multi-stage vacuum distillation according to claim 1, characterized in that: It also includes a temperature control system, which is connected to the distillation crucible heating furnace, the first collecting crucible heating furnace and the second collecting crucible heating furnace respectively.

9. The device for preparing high-purity magnesium ingots by multi-stage vacuum distillation according to claim 1, characterized in that: The vacuum pumping component includes a vacuum pump and a vacuum valve; the vacuum pump is connected to the vacuum chamber through a bellows, and the vacuum valve is arranged on the bellows.

10. The device for preparing high-purity magnesium ingots by multi-stage vacuum distillation according to claim 1, characterized in that: The vacuum system further includes a pressure gauge connected to the vacuum chamber for monitoring the pressure of the vacuum chamber.

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