Device and method for preparing high-purity magnesium-zinc alloy

Abstract

The invention relates to a device and a method for preparing a high-purity magnesium-zinc alloy, and belongs to the technical field of metal purification. The device for preparing the high-purity magnesium-zinc alloy comprises a smelting unit, a collecting unit, a cooling unit, a heating unit and a vacuum unit. Magnesium-zinc raw materials are smelted in the smelting unit and then subjected to vacuum distillation, impurity elements with low saturated vapor pressure are left in a smelting crucible, impurity elements with high vapor pressure enter a second collecting crucible, and high-purity magnesium-zinc vapor enters a first collecting crucible to be condensed into high-purity magnesium-zinc alloy melt; and further directionally solidifying the magnesium-zinc alloy melt by using a cooling unit to form a high-purity magnesium-zinc alloy cast ingot. The high-purity magnesium-zinc alloy is prepared according to the basic principle that the separation coefficient of magnesium and zinc is close to 1, and magnesium and zinc are volatilized at the same time and are difficult to separate in the vacuum distillation purification process.

Description

Technical Field

[0001] The invention belongs to the technical field of metal purification, and in particular relates to a device and a method for preparing a high-purity magnesium-zinc alloy. Background Art

[0002] Magnesium-zinc alloy (Mg-Zn alloy) is an important biodegradable bioimplant material. Since both Mg and Zn elements have good biocompatibility, Mg-Zn alloy can meet biological safety after degradation in the body. In addition, compared with pure magnesium and pure zinc, Mg-Zn alloy has higher strength, and thus can meet the high requirements of implants for comprehensive mechanical properties. For example, Chinese invention patent CN 1792384A discloses a Mg-xZn (1% ≤ x ≤ 8%) binary magnesium alloy material that can be absorbed in the body, and its tensile strength can be as high as 280MPa. This alloy not only meets the mechanical property requirements of biological implants, but also meets the biocompatibility and safety requirements.

[0003] At present, Mg-Zn alloys used for bio-implant materials are usually prepared by the following process: high-purity Mg (≥99.99%) and high-purity zinc (≥99.999%) are used as raw materials, weighed according to the metering ratio, and prepared by induction melting-casting. High-purity Mg-Zn alloy ingots are then manufactured through heat treatment, rolling, machining and other processes to manufacture bio-implants, such as vascular stents, bone nails, bone plates, etc. However, there are the following problems in preparing Mg-Zn alloys by melting and casting: First, the raw materials required for Mg-Zn alloys require high purity, generally the purity of Mg is greater than 99.99%, and the purity of Zn is greater than 99.999%. Moreover, there are special requirements for the content of individual impurity elements. Therefore, the cost of raw materials is relatively high. Second, after high-purity Mg and high-purity Zn are prepared, Mg-Zn alloys are melted and cast into ingots. This process may introduce new impurity elements to reduce the purity and biosafety of the alloy, which is a serious safety hazard for biomedical applications.

[0004] In view of the shortcomings of the existing preparation technology of Mg-Zn alloy, the present invention is proposed. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a device and method for preparing high-purity magnesium-zinc alloy. The magnesium-zinc raw material is smelted in a smelting unit, and then vacuum distilled. Impurity elements with low saturated vapor pressure remain in the smelting crucible, and impurity elements with high vapor pressure enter the second collecting crucible. High-purity magnesium-zinc vapor enters the first collecting crucible to condense into a high-purity magnesium-zinc alloy melt, and the cooling unit is further used to directionally solidify the magnesium-zinc alloy melt to form a high-purity magnesium-zinc alloy ingot. The present invention uses the basic principle that the separation coefficient of magnesium and zinc is close to 1, and magnesium and zinc are volatilized simultaneously and difficult to separate during the vacuum distillation purification process to prepare a high-purity magnesium-zinc alloy.

[0006] The first object of the present invention is to provide a device for preparing a high-purity magnesium-zinc alloy, comprising:

[0007] A smelting unit, including a smelting crucible;

[0008] A collecting unit, comprising a No. 1 collecting chamber and a No. 2 collecting chamber; the No. 1 collecting chamber is connected to the smelting unit, and the bottom of the No. 2 collecting chamber is connected to the top of the No. 1 collecting chamber;

[0009] A cooling unit connected to the bottom of the first collecting chamber;

[0010] A heating unit, comprising a melting crucible heating furnace, a No. 1 collecting chamber heating furnace and a No. 2 collecting chamber heating furnace, wherein the melting crucible is arranged in the melting crucible heating furnace, the No. 1 collecting chamber is provided with at least one collecting crucible heating furnace, and the No. 2 collecting chamber is provided with at least one collecting crucible heating furnace;

[0011] The vacuum unit comprises a vacuum cavity, and the smelting unit, the collecting unit, the cooling unit and the heating unit are all arranged in the vacuum cavity.

[0012] In one embodiment of the present invention, the smelting unit is provided with a steam outlet, the steam outlet is provided with a No. 2 connecting pipe, and a No. 2 connecting pipe heating furnace is provided outside the No. 2 connecting pipe.

[0013] In one embodiment of the present invention, the smelting crucible is connected to the inlet of the first collecting chamber through the second connecting pipe, and the outlet of the first collecting chamber is connected to the inlet of the second collecting chamber.

[0014] In one embodiment of the present invention, the No. 1 collection chamber includes a No. 1 collection crucible and a No. 1 collection crucible heating furnace arranged outside the No. 1 collection crucible; the No. 2 collection chamber includes a No. 2 collection crucible and a No. 2 collection crucible heating furnace arranged outside the No. 2 collection crucible.

[0015] In one embodiment of the present invention, the No. 1 collecting crucible and the No. 2 collecting crucible are connected via a No. 1 connecting pipe.

[0016] In one embodiment of the present invention, the cooling unit comprises a cooling chamber, a cooling medium inlet and a cooling medium outlet.

[0017] In one embodiment of the present invention, the vacuum unit further includes a tee, a vacuum valve, a connecting pipe and a vacuum pressure gauge, the tee is connected to the vacuum chamber, the tee is connected to the connecting pipe, and the vacuum valve is installed on the connecting pipe.

[0018] The second object of the present invention is to provide a method for preparing a high-purity magnesium-zinc alloy, which is prepared by using the device for preparing a high-purity magnesium-zinc alloy. The preparation method comprises the following steps:

[0019] S1. Load the raw materials into the melting crucible, evacuate the vacuum chamber to the target pressure, and then fill it with inert gas until the pressure in the vacuum chamber maintains a slightly positive pressure;

[0020] S2, heating the melting crucible to the target temperature to melt the raw materials;

[0021] S3, after smelting is completed, heating the No. 2 connecting pipe, the No. 1 collecting chamber and the No. 2 collecting chamber to the target temperature;

[0022] S4. The vacuum chamber is evacuated to the target pressure, and distillation and purification are started. The purified high-purity magnesium-zinc alloy is collected through the No. 1 collection chamber, and the impurity elements remain in the smelting crucible or enter the No. 2 collection chamber.

[0023] In one embodiment of the present invention, before smelting, the vacuum chamber is evacuated to 1×10 -5 Pa-1×10 -3 Pa; then fill the vacuum chamber with inert gas to 1.01×10 5 Pa-1.2×10 5 Pa;

[0024] After the smelting is completed, the vacuum chamber is evacuated to 1×10 -3 Pa-1×10 2 Pa, preferably the pressure range is 0.1Pa-10Pa.

[0025] In one embodiment of the present invention, the target temperature of the melting crucible is 675°C-800°C, preferably the target temperature is 695°C-715°C.

[0026] In one embodiment of the present invention, the target temperature of the second connecting pipe is 675°C-800°C, preferably the target temperature is 695°C-715°C;

[0027] The target temperature of the first collecting chamber is 620°C-650°C, preferably 635°C-645°C;

[0028] The target temperature of the second collection chamber is 570°C-620°C, preferably the target temperature is 590°C-610°C.

[0029] The technical solution of the present invention has the following advantages over the prior art:

[0030] (1) The device for preparing high-purity magnesium-zinc alloy described in the present invention has the following advantages: First, the requirements for raw materials are low: magnesium and zinc of ordinary purity are sufficient, and the cost of raw materials is low; second, the process is short: high-purity Mg-Zn alloy ingots with required components can be directly prepared, shortening the preparation process of high-purity Mg-Zn alloy ingots; third, high purity: the prepared Mg-Zn alloy ingot has high purity, avoiding the biosafety risks caused by impurities that may be introduced by traditional smelting; fourth, the ingot is dense: the prepared Mg-Zn alloy ingot is dense and has no shrinkage cavities, meeting the subsequent processing requirements.

[0031] (2) The preparation method of the present invention uses low-purity magnesium ingots (~99.9%) and zinc ingots (~99.9%) as raw materials to smelt magnesium-zinc alloy, and then purifies the magnesium-zinc alloy by vacuum distillation. During the distillation and purification process, impurity elements with a lower vapor pressure than magnesium and zinc remain in the smelting crucible, and impurity elements with a higher vapor pressure than magnesium and zinc first volatilize and condense and separate in the low temperature zone. Since the magnesium-zinc separation coefficient is close to 1, magnesium and zinc are difficult to separate during the vacuum distillation process, and both volatilize and condense at the same time. After complete cooling, a high-purity magnesium-zinc alloy ingot is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0033] Figure 1 This is a schematic diagram of the structure of the device for preparing high-purity magnesium-zinc alloy according to the present invention;

[0034] Explanation of the reference numerals: 11-melting crucible, 12-melting crucible cover, 13-collecting chamber No. 1, 14-collecting chamber cover No. 1, 15-collecting chamber No. 2, 16-collecting chamber cover No. 2, 17-connecting pipe No. 1, 18-connecting pipe No. 2, 19-guide pipe, 21-melting crucible heating furnace, 22-collecting chamber heating furnace No. 1, 23-collecting chamber heating furnace No. 2, 24-connecting pipe heating furnace No. 2, 31-insulating board No. 1, 32-insulating board No. 2, 33-insulating board No. 3, 34-insulating board No. 4, 41-cooling chamber, 42-cooling medium inlet, 43-cooling medium outlet, 51-vacuum chamber, 52-tee, 53-vacuum pump connecting pipe, 54-vacuum valve No. 1, 55-vacuum valve No. 2, 56-gas cylinder connecting pipe, 57-vacuum pressure gauge, 61-magnesium-zinc raw material, 62-high-purity magnesium-zinc alloy ingot. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0036] In the present invention, unless otherwise specified, the melting crucible heating furnace, the No. 1 collecting crucible heating furnace, the No. 2 collecting crucible heating furnace and the No. 2 connecting pipe heating furnace in the embodiments of the present invention are all resistance heating furnaces.

[0037] In the present invention, unless otherwise specified, the melting crucible, melting crucible cover, No. 1 collecting crucible, No. 1 collecting crucible cover, No. 2 collecting crucible, No. 2 collecting crucible cover, No. 1 connecting pipe, No. 2 connecting pipe and guide pipe in the embodiments of the present invention are all made of graphite with a purity of 99.999%.

[0038] In the present invention, unless otherwise specified, the material of the cooling chamber in the embodiments of the present invention is heat-resistant stainless steel.

[0039] In the present invention, unless otherwise specified, the purity of the high-purity argon gas used in the embodiments of the present invention is 99.999%.

[0040] In the present invention, unless otherwise specified, the purity of pure magnesium used in the embodiments of the present invention is 99.9%, and the purity of pure zinc is 99.9%.

[0041] Example 1

[0042] Reference Figure 1 As shown, the device for preparing high-purity magnesium-zinc alloy of the present invention comprises:

[0043] The smelting unit comprises a smelting crucible 11, a smelting crucible cover 12, a first insulation board 31, a second insulation board 32 and a smelting crucible heating furnace 21; the smelting crucible 11 is arranged in the smelting crucible heating furnace 21, the smelting crucible cover 12 is installed on the smelting crucible 11, the first insulation board 31 is placed under the smelting crucible 11, the second insulation board 32 is placed on the smelting crucible cover 12, and a coaxial hole is opened in the center of the smelting crucible cover 12 and the second insulation board 32, i.e., the outlet of the smelting unit; during smelting, a magnesium-zinc raw material 61 is placed in the smelting crucible 11; a second connecting pipe 18 is provided at the outlet of the smelting unit, and a second connecting pipe heating furnace 24 is provided outside the second connecting pipe 18.

[0044] The collecting unit comprises a No. 1 collecting chamber, a No. 2 collecting chamber, a No. 1 connecting pipe 17, a No. 3 heat insulation board 33 and a No. 4 heat insulation board 34, a No. 2 connecting pipe heating furnace 24, a No. 2 connecting pipe 18 and a guide pipe 19. A coaxial through hole is provided on the upper side of the No. 1 collecting crucible heating furnace 22 and the upper side of the No. 1 collecting crucible 13; the No. 1 collecting chamber comprises the No. 1 collecting crucible 13, the No. 1 collecting crucible cover 14 and the No. 1 collecting crucible heating furnace 22; the No. 2 collecting chamber comprises the No. 2 collecting crucible 15, the No. 2 collecting crucible cover 16 and the No. 2 collecting crucible heating furnace 23; the No. 1 collecting crucible heating furnace 22 is provided with a coaxial through hole ... The collecting crucible 13 and the No. 2 collecting crucible 15 are connected through a No. 1 connecting pipe 17; the No. 1 collecting chamber is connected to the smelting unit, and the bottom of the No. 2 collecting chamber is connected to the top of the No. 1 collecting chamber; the outlet of the No. 1 collecting chamber is connected to the entrance of the No. 2 collecting chamber; the No. 1 collecting crucible 13 is placed inside the No. 1 collecting crucible heating furnace 22, the No. 1 collecting crucible cover 14 is installed on the No. 1 collecting crucible 13, the No. 3 heat insulation board 33 is placed on the No. 1 collecting crucible cover 14, the No. 2 collecting crucible 15 is placed on the No. 3 heat insulation board 33, and the No. 2 collecting crucible 15 is installed on the No. 2 collecting crucible 15 The collecting crucible cover 16 is provided with a No. 4 heat insulation board 34 on the No. 2 collecting crucible cover 16; the No. 2 collecting crucible 15 is placed inside the No. 2 collecting crucible heating furnace 23; the bottom of the No. 2 collecting crucible 15, the No. 3 heat insulation board 33 and the No. 1 collecting crucible cover 14 are all provided with through holes; the upper end of the No. 1 connecting pipe 17 is installed in cooperation with the through hole at the bottom of the No. 2 collecting crucible 15, and the lower end of the No. 1 connecting pipe 17 is installed in cooperation with the through hole of the No. 1 collecting crucible cover 14; the No. 3 heat insulation board 33 is located between the No. 1 collecting crucible heating furnace 22 and the No. 2 collecting crucible heating furnace 23; the melting crucible 11 is connected to the entrance of the No. 1 collecting chamber through a No. 2 connecting pipe 18, the lower end of the No. 2 connecting pipe 18 is installed in cooperation with the through hole of the melting crucible cover 12, a No. 2 connecting pipe heating furnace 24 is installed on the outer side of the No. 2 connecting pipe 18, the end of the No. 2 connecting pipe 18 is connected to the guide pipe 19, and the opening of the guide pipe 19 faces downward; the No. 2 connecting pipe 18 passes through the upper side of the heating furnace and the through hole of the upper side of the No. 1 collecting crucible 13, and the No. 2 connecting pipe 18 is installed in cooperation with the through hole of the upper side of the No. 1 collecting crucible 13, and the high-purity magnesium-zinc alloy ingot 62 is collected in the No. 2 collecting crucible 15 after smelting.

[0045] The cooling unit is connected to the bottom of the first collecting chamber; the cooling unit includes a cooling chamber 41, a cooling medium inlet 42 and a cooling medium outlet 43.

[0046] The heating unit includes a melting crucible heating furnace 21, a No. 1 collecting crucible heating furnace 22, a No. 2 collecting crucible heating furnace 23 and a No. 2 connecting pipe heating furnace 24; the temperatures of each are independently controlled by a temperature control heating module, which is well known to ordinary technicians and will not be described here.

[0047] The vacuum unit includes a vacuum chamber 51, a tee 52, a No. 1 vacuum valve 54, a No. 1 vacuum valve, a No. 2 vacuum valve 55, a gas cylinder connecting pipe 56 and a vacuum pressure gauge 57; the tee 52 is connected to the vacuum chamber 51, and the tee 52 is respectively connected to the No. 1 vacuum valve 54 and the gas cylinder connecting pipe 56, the No. 1 vacuum valve is installed on the No. 1 vacuum valve 54, the No. 2 vacuum valve 55 is installed on the gas cylinder connecting pipe 56, the No. 1 vacuum valve 54 is connected to the vacuum pump group, and the vacuum pump group is a device well known to the majority of technical personnel and will not be described in detail here; the vacuum pressure gauge 57 is connected to the vacuum chamber 51, and the gas cylinder connecting pipe 56 is connected to the external gas cylinder; the No. 1 vacuum valve controls the vacuum degree of the vacuum chamber 51; the No. 2 vacuum valve 55 controls the amount of gas introduced into the vacuum chamber 51; wherein the smelting unit, the collecting unit, the cooling unit and the heating unit are all arranged in the vacuum chamber 51.

[0048] Example 2

[0049] The method for preparing a high-purity magnesium-zinc alloy using the device of high-purity magnesium-zinc alloy in Example 1 as a generating device specifically comprises the following steps:

[0050] S1. According to the composition requirements of Mg-1% Zn alloy, weigh pure magnesium and pure zinc;

[0051] S2. Put the weighed pure magnesium and pure zinc into the melting crucible, put the melting crucible into the melting crucible heating furnace, close the furnace door of the vacuum chamber; open the No. 1 vacuum valve, start the vacuum pump to evacuate the vacuum chamber to 1×10 -5 Pa, close the No. 1 vacuum valve; open the No. 2 vacuum valve, and introduce high-purity argon gas into the vacuum chamber until the pressure inside the chamber reaches 1.1×10 5 Pa, close the No. 2 vacuum valve; open the melting crucible heating furnace, raise the temperature to 700℃ and melt for 1h; open the No. 1 collecting crucible heating furnace, the No. 2 collecting crucible heating furnace, and the No. 2 connecting pipe heating furnace, and heat them to 640℃, 600℃, and 700℃ respectively;

[0052] S3, open the No. 1 vacuum valve, start the vacuum pump to evacuate the vacuum chamber to 0.1Pa; start distillation and purification, magnesium vapor and zinc vapor enter the No. 1 collecting crucible through the No. 2 connecting pipe and the guide pipe, and the impurity elements with higher vapor pressure enter the No. 2 collecting crucible; after the distillation is completed, compressed air is introduced into the cooling medium inlet, the cooling chamber is cooled, and the magnesium-zinc melt in the No. 1 collecting crucible is directionally solidified, and the directional solidification is completed to form a high-purity magnesium-zinc alloy ingot;

[0053] S4, turn off the power of all heating furnaces, open the No. 2 vacuum valve, introduce high-purity argon gas into the vacuum chamber until the pressure reaches 1 atm, wait until the temperature of each heating furnace drops to room temperature, open the vacuum chamber furnace door, and take out the high-purity magnesium-zinc alloy ingot in the No. 1 collecting crucible;

[0054] GDMS composition test was carried out by taking samples from the top, middle and bottom of the 1 / 2 radius of the ingot to exclude metallic impurity elements. The total purity of the main metal magnesium and zinc elements was higher than 99.999%.

[0055] Example 3

[0056] The method for preparing a high-purity magnesium-zinc alloy using the device of high-purity magnesium-zinc alloy in Example 1 as a generating device specifically comprises the following steps:

[0057] S1. According to the composition requirements of Mg-6% Zn alloy, weigh pure magnesium and pure zinc;

[0058] S2. Put the weighed pure magnesium and pure zinc into the melting crucible, put the melting crucible into the melting crucible heating furnace, close the furnace door of the vacuum chamber; open the No. 1 vacuum valve, start the vacuum pump to evacuate the vacuum chamber to 1×10 -3 Pa, close the No. 1 vacuum valve; open the No. 2 vacuum valve, and introduce high-purity argon gas into the vacuum chamber until the pressure inside the chamber reaches 1.1×10 5 Pa, close the No. 2 vacuum valve; open the melting crucible heating furnace, raise the temperature to 715℃ and melt for 1h; open the No. 1 collecting crucible heating furnace, the No. 2 collecting crucible heating furnace, and the No. 2 connecting pipe heating furnace, and heat them to 635℃, 590℃, and 715℃ respectively;

[0059] S3, open the No. 1 vacuum valve, start the vacuum pump to evacuate the vacuum chamber to 1Pa; start distillation and purification, magnesium vapor and zinc vapor enter the No. 1 collecting crucible through the No. 2 connecting pipe and the guide pipe, and the impurity elements with higher vapor pressure enter the No. 2 collecting crucible; after the distillation is completed, compressed air is introduced into the cooling medium inlet, the cooling chamber is cooled, and the magnesium-zinc melt in the No. 1 collecting crucible is directionally solidified, and the directional solidification is completed to form a high-purity magnesium-zinc alloy ingot;

[0060] S4, turn off the power of all heating furnaces, open the No. 2 vacuum valve, introduce high-purity argon gas into the vacuum chamber until the pressure reaches 1 atm, wait until the temperature of each heating furnace drops to room temperature, open the vacuum chamber furnace door, and take out the high-purity magnesium-zinc alloy ingot in the No. 1 collecting crucible;

[0061] GDMS composition test was carried out by taking samples from the top, middle and bottom of the 1 / 2 radius of the ingot to exclude metallic impurity elements. The total purity of the main metal magnesium and zinc elements was higher than 99.999%.

[0062] The present invention uses the basic principle that the separation coefficient of magnesium and zinc is close to 1, magnesium and zinc volatilize simultaneously and are difficult to separate, to prepare a high-purity magnesium-zinc alloy. Of course, the device and method of the present invention are not only applicable to the preparation of high-purity magnesium-zinc alloys, but also applicable to other binary alloys with a separation coefficient close to 1.

[0063] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A device for preparing high-purity magnesium-zinc alloy, characterized in that: include, A smelting unit, including a smelting crucible; A collecting unit, comprising a No. 1 collecting chamber and a No. 2 collecting chamber; the No. 1 collecting chamber is connected to the smelting unit, and the bottom of the No. 2 collecting chamber is connected to the top of the No. 1 collecting chamber; A cooling unit connected to the bottom of the first collecting chamber; A heating unit, comprising a melting crucible heating furnace, a No. 1 collecting chamber heating furnace and a No. 2 collecting chamber heating furnace, wherein the melting crucible is arranged in the melting crucible heating furnace, the No. 1 collecting chamber is provided with at least one collecting crucible heating furnace, and the No. 2 collecting chamber is provided with at least one collecting crucible heating furnace; The vacuum unit comprises a vacuum cavity, and the smelting unit, the collecting unit, the cooling unit and the heating unit are all arranged in the vacuum cavity.

2. The device for preparing high-purity magnesium-zinc alloy according to claim 1, characterized in that: The smelting unit is provided with a steam outlet, the steam outlet is provided with a No. 2 connecting pipe, and a No. 2 connecting pipe heating furnace is provided outside the No. 2 connecting pipe.

3. The device for preparing high-purity magnesium-zinc alloy according to claim 2, characterized in that: The smelting crucible is connected to the inlet of the first collecting chamber through the second connecting pipe, and the outlet of the first collecting chamber is connected to the inlet of the second collecting chamber.

4. The device for preparing high-purity magnesium-zinc alloy according to claim 1, characterized in that: The No. 1 collecting chamber includes a No. 1 collecting crucible and a No. 1 collecting crucible heating furnace arranged outside the No. 1 collecting crucible; the No. 2 collecting chamber includes a No. 2 collecting crucible and a No. 2 collecting crucible heating furnace arranged outside the No. 2 collecting crucible.

5. The device for preparing high-purity magnesium-zinc alloy according to claim 4, characterized in that: The No. 1 collecting crucible and the No. 2 collecting crucible are connected via a No. 1 connecting pipe.

6. The device for preparing high-purity magnesium-zinc alloy according to claim 1, characterized in that: The cooling unit includes a cooling chamber, a cooling medium inlet, and a cooling medium outlet.

7. A method for preparing a high-purity magnesium-zinc alloy, characterized in that: The high-purity magnesium-zinc alloy is prepared by using the device for preparing the high-purity magnesium-zinc alloy as described in any one of claims 1 to 6, and the preparation method comprises the following steps: S1. Load the raw materials into the melting crucible, evacuate the vacuum chamber to the target pressure, and then fill it with inert gas until the pressure in the vacuum chamber maintains a slightly positive pressure; S2, heating the melting crucible to the target temperature to melt the raw materials; S3, after smelting is completed, heating the No. 2 connecting pipe, the No. 1 collecting chamber and the No. 2 collecting chamber to the target temperature; S4. The vacuum chamber is evacuated to the target pressure, and distillation and purification are started. The purified high-purity magnesium-zinc alloy is collected through the No. 1 collection chamber, and the impurity elements remain in the melting crucible or enter the No. 2 collection chamber.

8. The method for preparing a high-purity magnesium-zinc alloy according to claim 7, characterized in that: Before melting, evacuate the vacuum chamber to 1×10 -5 Pa-1×10 -3 Pa; then fill the vacuum chamber with inert gas to 1.01×10 5 Pa-1.2×10 5 Pa; After the smelting is completed, the vacuum chamber is evacuated to 1×10 -3 Pa-1×10 2 Pa.

9. The method for preparing a high-purity magnesium-zinc alloy according to claim 7, characterized in that: The target temperature of the melting crucible is 675°C-800°C.

10. The method for preparing a high-purity magnesium-zinc alloy according to claim 7, characterized in that: The target temperature of the No. 2 connecting pipe is 675°C-800°C; The target temperature of the No. 1 collection chamber is 620°C-650°C; The target temperature of the No. 2 collection chamber is 570°C-620°C.

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