Purification Method of Beryllium Waste Based on Molten Salt Electrolytic Refining

Abstract

This invention discloses a method for purifying beryllium waste based on molten salt electrolytic refining, comprising: pretreating beryllium waste and fabricating the pretreated beryllium waste into an electrode; using the fabricated beryllium waste electrode as the anode, a chloride molten salt electrolyte as the supporting electrolyte, and a high-purity metal electrode as the cathode to form a first electrolytic system; performing a first constant-current electrolysis in the first electrolytic system under an inert atmosphere, and collecting metallic beryllium at the cathode; using the collected metallic beryllium as the anode, a fluoride molten salt electrolyte as the supporting electrolyte, and a high-purity metal electrode as the cathode to form a second electrolytic system; and performing a second constant-current electrolysis in the second electrolytic system under an inert atmosphere, and collecting high-purity metallic beryllium at the cathode.

Description

Technical Field

[0001] This invention belongs to the field of electrochemical metallurgy technology, specifically relating to a method for purifying beryllium waste based on molten salt electrolytic refining. Background Technology

[0002] Beryllium possesses a range of excellent properties, including good X-ray permeability, strong nuclear properties, and high specific heat and dimensional stability. Its use in high-tech fields such as nuclear and aerospace has increased dramatically in recent years. However, due to beryllium's extreme toxicity and high melting point, the disposal of beryllium waste in industry is exceptionally difficult, resulting in a large volume of beryllium waste. Currently, beryllium waste treatment poses significant environmental safety hazards; therefore, it is necessary to accelerate the resource utilization of beryllium and develop beryllium waste recycling technologies.

[0003] Beryllium waste mainly includes cutting waste from the production of beryllium alloys and scrapped beryllium alloys. To realize the resource utilization of beryllium, it is necessary to find a technology to remove impurity elements from the beryllium waste and produce high-purity beryllium products. Summary of the Invention

[0004] In view of this, some embodiments disclose a method for purifying beryllium waste based on molten salt electrolytic refining, the method comprising:

[0005] Pre-treat beryllium waste, and then process the pre-treated beryllium waste into electrodes;

[0006] The first electrolysis system is formed by using the beryllium waste electrode as the anode, the chloride molten salt electrolyte as the supporting electrolyte, and the high-purity metal electrode as the cathode.

[0007] Under the protection of an inert atmosphere, the first electrolysis system undergoes the first constant current electrolysis, and metallic beryllium is collected at the cathode;

[0008] The collected beryllium metal was used as the anode, fluoride molten salt electrolyte was used as the supporting electrolyte, and high-purity metal electrode was used as the cathode to form a second electrolysis system.

[0009] Under the protection of an inert atmosphere, the second electrolysis system undergoes a second constant current electrolysis, and high-purity metallic beryllium is collected at the cathode.

[0010] Furthermore, some embodiments disclose a beryllium waste purification method based on molten salt electrolytic refining, wherein the pretreatment of the beryllium waste includes:

[0011] The beryllium waste is cut, and then impurities on the surface of the cut beryllium waste are removed by degreasing, pickling, and drying.

[0012] Some embodiments disclose a beryllium waste purification method based on molten salt electrolytic refining, wherein the high-purity metal electrode is a titanium electrode.

[0013] Some embodiments disclose a method for purifying beryllium waste based on molten salt electrolytic refining, wherein the chloride molten salt electrolyte is one or more of alkali metal chlorides and alkaline earth metal chlorides; and the fluoride molten salt electrolyte is one or more of alkali metal fluorides and alkaline earth metal fluorides.

[0014] Some embodiments disclose a beryllium waste purification method based on molten salt electrolytic refining, wherein the chloride molten salt electrolyte is a LiCl-based chloride salt, and the average ionic radius of the cation is not greater than 100 nm.

[0015] Some embodiments disclose a beryllium waste purification method based on molten salt electrolytic refining, wherein the chloride molten salt electrolyte is a MgCl2-based chloride salt, and the average ionic radius of the cation is not greater than 100 nm.

[0016] Some embodiments disclose a beryllium waste purification method based on molten salt electrolytic refining, wherein the fluoride molten salt electrolyte is a KF-based fluoride salt, and the average ionic radius of the cation is not less than 150 nm.

[0017] Some embodiments disclose a beryllium waste purification method based on molten salt electrolytic refining, wherein the cathode current of the first constant current electrolysis is set to 0.01–1.5 A·cm. -2 The anode current density is 0.1–1.2 A·cm. -2 Furthermore, the cathode current density is 2 to 10 times that of the anode current density; the cathode current for the second constant current electrolysis is set to 0.01 to 1.5 A·cm. -2 The anode current density is 0.1–1.2 A·cm. -2 Furthermore, the cathode current density is 2 to 10 times that of the anode current density.

[0018] Some embodiments disclose a beryllium waste purification method based on molten salt electrolytic refining, which supports the preparation of electrolytes from chlorides or fluorides through pre-melting and mixing.

[0019] Some embodiments disclose a beryllium waste purification method based on molten salt electrolytic refining. In the constant current electrolysis process, during the first constant current electrolysis process, the temperature of the supporting electrolyte is set to 300-900°C and the electrolysis time is set to 6-10h; during the second constant current electrolysis process, the temperature of the supporting electrolyte is set to 300-900°C and the electrolysis time is set to 6-10h.

[0020] The beryllium waste purification method based on molten salt electrolytic refining disclosed in this invention first pre-treats the beryllium waste, and then performs two independent constant current electrolysis processes on the beryllium waste. In the two constant current electrolysis processes, different electrolysis systems are used to remove different impurity elements, which effectively reduces the content of impurity elements and improves the purity of metallic beryllium. It has good application prospects in the field of beryllium waste recycling. Attached Figure Description

[0021] Figure 1 Example 1: Flowchart of a beryllium waste purification method based on molten salt electrolytic refining. Detailed Implementation

[0022] The term "embodiment" used herein, as an example, is not necessarily to be construed as superior to or better than other embodiments. Performance testing in these embodiments of the invention, unless otherwise specified, employs conventional testing methods in the art. It should be understood that the terminology used in these embodiments is merely for describing particular implementations and is not intended to limit the scope of the disclosure of these embodiments.

[0023] Unless otherwise stated, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this invention pertain; other experimental methods and technical means not specifically noted in the embodiments of this invention refer to experimental methods and technical means commonly used by one of ordinary skill in the art.

[0024] The terms “basic” and “approximately” as used herein are used to describe small fluctuations. For example, they can refer to less than or equal to ±5%, such as less than or equal to ±2%, such as less than or equal to ±1%, such as less than or equal to ±0.5%, such as less than or equal to ±0.2%, such as less than or equal to ±0.1%, such as less than or equal to ±0.05%. Numerical data presented or expressed in range format herein are used for convenience and brevity only, and should therefore be flexibly interpreted to include not only the explicitly listed values ​​that define the range, but also all independent values ​​or subranges contained within the range. For example, a numerical range of “1–5%” should be interpreted to include not only the explicitly listed values ​​from 1% to 5%, but also the independent values ​​and subranges within the indicated range. Thus, this numerical range includes independent values ​​such as 2%, 3.5%, and 4%, and subranges such as 1%–3%, 2%–4%, and 3%–5%, etc. This principle also applies to ranges that list only one value. Furthermore, this interpretation applies regardless of the width of the range or the characteristics described.

[0025] In this document, including in the claims, conjunctions such as "comprising," "including," "with," "having," "containing," "involving," and "accommodating" are understood to be open-ended, meaning "including but not limited to." Only the conjunctions "consisting of" and "composed of" are closed conjunctions.

[0026] To better illustrate the content of this invention, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that the invention can be practiced even without certain specific details. In the embodiments, some methods, means, instruments, and devices well-known to those skilled in the art are not described in detail, in order to highlight the main points of the invention.

[0027] Without conflict, the technical features disclosed in the embodiments of the present invention can be combined arbitrarily, and the resulting technical solution belongs to the content disclosed in the embodiments of the present invention.

[0028] In some embodiments, the beryllium waste purification method based on molten salt electrolytic refining includes:

[0029] Pre-treat beryllium waste, and then process the pre-treated beryllium waste into electrodes;

[0030] Using a beryllium waste electrode as the anode, a chloride molten salt electrolyte as the supporting electrolyte, and a high-purity metal electrode as the cathode, a first electrolysis system is formed. Typically, the composition of the supporting electrolyte is controlled to select a suitable supporting electrolyte for the electrolytic production of metallic beryllium. Factors considered in electrolyte composition control include the valence state, ionic radius, and ionic polarity of electrolyte ions, as well as the impurity content in the beryllium waste. Adding an appropriate amount of beryllium ions to the supporting electrolyte is beneficial for the electrolysis process. In some embodiments, controlling the cation radius, anionic polarization, impurity content, and composition of the molten salt electrolyte yields a combined electrolyte with suitable viscosity, conductivity, vapor pressure, and ion solubility.

[0031] Under an inert atmosphere, the first electrolysis system undergoes a first constant current electrolysis, and pure metallic beryllium is collected at the cathode. Typically, the molten salt electrolyte is deheated to a set temperature, becoming a molten state, and then electrolyzed under an inert gas atmosphere. During electrolysis, metallic beryllium in the anode dissolves into the molten salt electrolyte, diffuses to the cathode, and precipitates as metallic beryllium.

[0032] The metallic beryllium deposited at the cathode is collected and used to make the anode, for example, by placing it back into a titanium basket as the anode. A fluoride molten salt electrolyte is used as the supporting electrolyte, and a high-purity metal electrode is used as the cathode to form a second electrolysis system. Typically, the composition of the supporting electrolyte is controlled to select a suitable supporting electrolyte for the electrolytic production of metallic beryllium. The reference factors for controlling the electrolyte composition include the valence state, ionic radius, and ionic polarity of electrolyte ions, as well as the impurity content in the beryllium waste. Adding an appropriate amount of beryllium ions to the supporting electrolyte is beneficial to the electrolysis process. In some embodiments, the cation radius, anion polarization force, impurity content, and composition of the molten salt electrolyte are controlled to obtain a combined electrolyte with suitable viscosity, conductivity, vapor pressure, and ion solubility.

[0033] Under an inert atmosphere, the second electrolysis system undergoes a second constant-current electrolysis, with high-purity beryllium collected at the cathode. Typically, the molten salt electrolyte is heated to a set temperature to molten state, and electrolysis is carried out under inert gas protection. During electrolysis, the beryllium in the anode dissolves into the molten salt electrolyte, diffuses to the cathode, and precipitates as high-purity beryllium. The high-purity beryllium collected from the cathode is usually in dendritic form.

[0034] Generally, the first constant current electrolysis can partially remove impurity elements from beryllium waste, and the second constant current electrolysis can remove the remaining impurity elements. After two constant current electrolysis processes, the impurity elements in the beryllium waste are completely removed, and high-purity metallic beryllium can be obtained.

[0035] In some embodiments, the first constant current electrolysis is carried out in a chloride molten salt dielectric, and the second constant current electrolysis is carried out in a fluoride molten salt electrolyte.

[0036] In some embodiments, the first constant current electrolysis is carried out in a fluoride molten salt dielectric, and the second constant current electrolysis is carried out in a chloride molten salt electrolyte.

[0037] In some embodiments, pretreatment of beryllium waste includes cutting the beryllium waste and then removing impurities from the surface of the cut beryllium waste through degreasing, pickling, and drying. Typically, the beryllium waste can be processed into small particles of a certain size, for example, by cutting it into powder of a certain particle size, to facilitate subsequent processing and improve processing efficiency. For example, powder materials are easier to clean in cleaning and impurity removal processes, and the efficiency of the impurity removal process is also improved. Cleaning and impurity removal typically includes processes such as degreasing, pickling, and drying. The degreasing process removes oil contaminants adhering to the surface of the scale waste, the pickling process removes other metallic impurities present in the beryllium waste, and the drying process removes moisture and other volatile impurities, preventing the presence of oil contaminants, metallic impurities, moisture, and volatile impurities from affecting the purification of metallic beryllium in the electrolytic process.

[0038] In some embodiments, the pretreated beryllium waste is assembled in a metal basket, which is then used as the anode in a constant current electrolysis process. Typically, the metal basket is an inert metal basket, meaning it is made of inert metal and has a cavity for holding the beryllium waste. The basket itself has a multi-mesh structure to facilitate mass exchange between the molten salt electrolyte and the anode. The metal basket is usually flat, and the current density of the anode can be controlled by adjusting its surface area.

[0039] In some embodiments, the high-purity metal electrode is a titanium electrode. Typically, the titanium electrode is a titanium metal plate with a certain surface area; the current density of constant current electrolysis can be adjusted by adjusting the surface area of ​​the titanium metal plate.

[0040] In some embodiments, the chloride molten salt supporting electrolyte is one or more combinations of alkali metal chlorides and alkaline earth metal chlorides.

[0041] In some embodiments, the fluoride molten salt supporting electrolyte is one or more combinations of alkali metal fluorides or alkaline earth metal fluorides.

[0042] In some embodiments, the supporting electrolyte is a LiCl-based chloride salt, wherein the average ionic radius of the cation is not greater than 100 nm.

[0043] In some embodiments, the supporting electrolyte is a MgCl2-based chloride salt, wherein the average ionic radius of the cation is not greater than 100 nm.

[0044] In some embodiments, the supporting electrolyte is a KF-based fluoride salt, wherein the average radius of the cation is not less than 150 nm.

[0045] In some embodiments, the cathode current of the first constant current electrolysis is set to 0.01–1.5 A·cm. -2 The anode current density is 0.1–1.2 A·cm. -2 Furthermore, the cathode current density is 2 to 10 times that of the anode current density.

[0046] In some embodiments, the cathode current of the second constant current electrolysis is set to 0.01–1.5 A·cm. -2 The anode current density is 0.1–1.2 A·cm. -2 Furthermore, the cathode current density is 2 to 10 times that of the anode current density.

[0047] In some embodiments, the chloride molten salt electrolyte is prepared by pre-melting and mixing chloride electrolyte as raw material.

[0048] In some embodiments, the fluoride molten salt electrolyte is prepared by pre-melting and mixing fluoride electrolyte as raw material.

[0049] Typically, chloride electrolytes are one or more combinations of alkali metal chlorides and alkaline earth metal chlorides. The composition of the supporting electrolyte is selected based on the content and electronegativity of impurities in the beryllium waste. For example, if the impurities to be removed include Mg and Al, then alkali metal fluorides or alkaline earth metal fluorides need to be selected; if the impurities include Fe, Cu, Si, etc., then alkali metal chlorides or alkaline earth metal chlorides need to be selected.

[0050] In this embodiment of the invention, chloride molten salt is selected as the supporting electrolyte, and a constant current electrolysis process is used to remove impurities such as Fe, Cu, and Si from beryllium waste; fluoride molten salt is used as the supporting electrolyte, and a constant current electrolysis process is used to remove impurities such as Mg and Al from beryllium waste; the two constant current electrolysis processes are carried out separately and independently, without affecting each other, and can effectively remove impurity elements from beryllium waste, ultimately obtaining high-purity metallic beryllium.

[0051] In some embodiments, during the first constant current electrolysis process, the temperature of the supporting electrolyte is set to 300–900°C, and the electrolysis time is set to 6–10 hours. During the second constant current electrolysis process, the temperature of the supporting electrolyte is set to 300–900°C, and the electrolysis time is set to 6–10 hours. Both the first and second constant current electrolysis processes can be carried out efficiently, and the final product purity reaches 99.9%, with impurity content in the beryllium metal matrix less than 100 ppm.

[0052] In some embodiments, such as Figure 1 As shown, the beryllium waste purification method based on molten salt electrolytic refining includes:

[0053] S1. Pre-treat beryllium waste and process the pre-treated beryllium waste into electrodes;

[0054] S2. Using the beryllium waste electrode as the anode, the chloride molten salt electrolyte as the supporting electrolyte, and the high-purity metal electrode as the cathode, a first electrolysis system is formed.

[0055] S3. Under the protection of an inert atmosphere, the first electrolysis system undergoes the first constant current electrolysis, and metallic beryllium is collected at the cathode;

[0056] S4. The collected beryllium metal is used as the anode, fluoride molten salt electrolyte is used as the supporting electrolyte, and high-purity metal electrode is used as the cathode to form a second electrolysis system.

[0057] S5. Under the protection of an inert atmosphere, the second electrolysis system undergoes a second constant current electrolysis, and high-purity metallic beryllium is collected at the cathode.

[0058] In some embodiments, the process flow of the beryllium waste purification method based on molten salt electrolytic refining includes:

[0059] S1. Clean, remove impurities, and dry the beryllium cutting waste; the dried beryllium cutting waste is then placed into a titanium basket.

[0060] S2. A first electrolysis system is formed by using a titanium basket as the anode, one or more of alkali metal chlorides and alkaline earth metal chlorides as the supporting electrolyte, and a high-purity metal electrode as the cathode.

[0061] S3. Under the protection of an inert atmosphere, the first electrolysis system undergoes the first constant current electrolysis. The beryllium waste dissolves at the anode and metallic beryllium is deposited at the cathode. The metallic beryllium deposited at the cathode is collected.

[0062] S4. The collected beryllium metal is loaded into a titanium basket as the anode, and one or more combinations of alkali metal fluorides and alkaline earth metal fluorides are used as the supporting electrolyte. A high-purity metal electrode is used as the cathode to form a second electrolysis system.

[0063] S5. Under the protection of an inert atmosphere, the second electrolysis system undergoes a second constant current electrolysis, and metallic beryllium is deposited at the cathode, and dendritic high-purity metallic beryllium is collected.

[0064] Example 1

[0065] Methods for purifying beryllium waste based on molten salt electrolytic refining include:

[0066] S1. Use ultrasonic cleaning to remove surface oil stains from beryllium cutting waste, then clean with alcohol for 2 hours to remove residual impurities. Transfer to a drying oven and dry for 2 hours. Pack the dried cutting waste into a titanium basket with a cross-sectional area of ​​25 cm². 2 ;

[0067] S2. Using a titanium basket as the anode, with a cross-sectional area of ​​10 cm² 2 A high-purity titanium plate is used as the cathode, and the electrode spacing is set to 1.5 cm. In a glove box, LiCl and KCl are used as molten salt electrolytes, and the chloride salts are subjected to dehydration, pre-melting and pre-electrolysis operations respectively. Then, LiCl and KCl are mixed in a mass ratio of 59:41 as the supporting electrolyte. The anode, cathode and supporting electrolyte are assembled into the first electrolysis system.

[0068] S3. Under the protection of an inert atmosphere, the first electrolysis system is subjected to the first constant current electrolysis. The electrolyte temperature is supported to rise to 450°C, the current intensity is set to 10A, and the electrolysis is carried out for 8 hours. The cathode product is then collected after cooling. Analysis shows that the collected cathode product is metallic beryllium, and the contents of Fe, Cu and Si are less than 55ppm.

[0069] S4. The collected cathode product, metallic beryllium, is loaded into a titanium basket as the anode. The cross-sectional area of ​​the basket is 25 cm².2 KF and NaF were selected as molten salt electrolytes. In a glove box, KF and NaF were dehydrated, pre-melted, and pre-electrolyzed respectively. Then, KF and NaF were mixed at a mass ratio of 61:39 to form the supporting electrolyte, with a cross-sectional area of ​​10 cm². 2 A titanium plate serves as the cathode, forming the second electrolysis system; the electrode spacing is set to 1.5 cm.

[0070] S5. Under the protection of an inert atmosphere, the second electrolysis system undergoes a second constant current electrolysis, supporting the electrolyte temperature to 800℃, setting the current intensity to 10A, and electrolyzing for 8 hours to deposit metallic beryllium at the cathode. Dendritic high-purity metallic beryllium is collected; the Mg and Al content in the high-purity metallic beryllium product is less than 30ppm.

[0071] Ultimately, the obtained high-purity metallic beryllium is dendritic high-purity beryllium with a purity of up to 99.9%. The content of Mg and Al in the high-purity metallic beryllium is less than 30 ppm, and the content of Fe, Cu and Si is less than 55 ppm.

[0072] Example 2

[0073] Methods for purifying beryllium waste based on molten salt electrolytic refining include:

[0074] S1. Cut the beryllium scrap into particles smaller than 0.5 cm, clean it using ultrasound to remove surface oil stains, clean it with alcohol for 2 hours to remove residual impurities, and then dry it in a drying oven for 2 hours. Pack the dried scrap into a titanium basket with a cross-sectional area of ​​30 cm². 2 ;

[0075] S2. Using a titanium basket as the anode, with a cross-sectional area of ​​4 cm² 2 A high-purity titanium plate is used as the cathode, and the electrode spacing is set to 2.0 cm. In a glove box, LiCl and NaCl are used as molten salt electrolytes. The LiCl and NaCl are subjected to dehydration, pre-melting and pre-electrolysis operations respectively. Then, LiCl and NaCl are mixed in a mass ratio of 72:28 as the supporting electrolyte. The anode, cathode and supporting electrolyte are assembled into the first electrolysis system.

[0076] S3. Under the protection of an inert atmosphere, the first electrolysis system undergoes the first constant current electrolysis, supporting the electrolyte temperature to 650℃, setting the current intensity to 10A, electrolyzing for 8 hours, and then cooling and collecting the cathode product; analysis shows that the collected cathode product is metallic beryllium, with Fe, Cu and Si contents of less than 40ppm.

[0077] S4. The collected cathode product, metallic beryllium, is loaded into a titanium basket as the anode. The cross-sectional area of ​​the basket is 30 cm². 2KF and CsF were selected as molten salt electrolytes. In a glove box, KF and CsF were dehydrated, pre-melted, and pre-electrolyzed respectively. Then, KF and CsF were mixed at a mass ratio of 43:57 to form the supporting electrolyte, with a cross-sectional area of ​​5 cm². 2 A titanium plate serves as the cathode, forming the second electrolysis system; the electrode spacing is set to 2.0 cm.

[0078] S5. Under the protection of an inert atmosphere, the second electrolysis system undergoes a second constant current electrolysis, supporting the electrolyte temperature to 700℃, setting the current intensity to 10A, and electrolyzing for 8 hours; metallic beryllium is deposited at the cathode, and dendritic high-purity metallic beryllium is collected; the Mg and Al contents in the high-purity metallic beryllium product are less than 53ppm.

[0079] Ultimately, the obtained high-purity metallic beryllium is dendritic high-purity beryllium with a purity of up to 99.9%. The content of Mg and Al in the high-purity metallic beryllium is less than 40 ppm, and the content of Fe, Cu and Si is less than 53 ppm.

[0080] The beryllium waste purification method based on molten salt electrolytic refining disclosed in this invention pretreats the beryllium waste and then performs two independent constant current electrolysis processes on the beryllium waste. In the two constant current electrolysis processes, different electrolysis systems are used to remove different impurity elements, which effectively reduces the impurity content and improves the purity of metallic beryllium. It has good application prospects in the field of beryllium waste recycling.

[0081] The technical solutions and technical details disclosed in the embodiments of this invention are merely illustrative of the inventive concept of this invention and do not constitute a limitation on the technical solutions of the embodiments of this invention. Any conventional changes, substitutions, or combinations made to the technical details disclosed in the embodiments of this invention have the same inventive concept as this invention and are within the protection scope of the claims of this invention.

Claims

1. A method for purifying beryllium waste based on molten salt electrolytic refining, characterized in that, include: Pre-treat beryllium waste, and then process the pre-treated beryllium waste into electrodes; A first electrolysis system is formed by using a beryllium waste electrode as the anode, a chloride molten salt electrolyte as the supporting electrolyte, and a high-purity metal electrode as the cathode; the chloride molten salt electrolyte is one or more combinations of alkali metal chlorides and alkaline earth metal chlorides. Under an inert atmosphere, the first electrolytic system undergoes a first constant-current electrolysis, with metallic beryllium collected at the cathode; the cathode current for the first constant-current electrolysis is set to 0.01~1.5 A•cm. -2 The anode current density is 0.1~1.2 A•cm. -2 Furthermore, the cathode current density is 2 to 10 times that of the anode current density; during the first constant current electrolysis process, the temperature of the supporting electrolyte is set to 300 to 900°C, and the electrolysis time is set to 6 to 10 hours. The collected beryllium metal is used as the anode, a fluoride molten salt electrolyte is used as the supporting electrolyte, and a high-purity metal electrode is used as the cathode to form a second electrolysis system; the fluoride molten salt electrolyte is one or more of alkali metal fluorides or alkaline earth metal fluorides. Under an inert atmosphere, the second electrolysis system undergoes a second constant-current electrolysis, and high-purity metallic beryllium is collected at the cathode; the cathode current for the second constant-current electrolysis is set to 0.01~1.5 A•cm. -2 The anode current density is 0.1~1.2 A•cm. -2 Furthermore, the cathode current density is 2 to 10 times that of the anode current density. During the second constant current electrolysis process, the temperature of the supporting electrolyte is set to 300 to 900°C, and the electrolysis time is set to 6 to 10 hours.

2. The beryllium waste purification method based on molten salt electrolytic refining according to claim 1, characterized in that, The pretreated beryllium waste includes: The beryllium waste is cut, and then impurities on the surface of the cut beryllium waste are removed by degreasing, pickling, and drying.

3. The beryllium waste purification method based on molten salt electrolytic refining according to claim 1, characterized in that, The high-purity metal electrode is a titanium electrode.

4. The method for purifying beryllium waste based on molten salt electrolytic refining according to claim 1, characterized in that, The chloride molten salt electrolyte is a LiCl-based chloride salt, wherein the average ionic radius of the cation is not greater than 100 nm.

5. The method for purifying beryllium waste based on molten salt electrolytic refining according to claim 1, characterized in that, The chloride molten salt electrolyte is a MgCl2-based chloride salt, wherein the average ionic radius of the cation is not greater than 100 nm.

6. The method for purifying beryllium waste based on molten salt electrolytic refining according to claim 1, characterized in that, The fluoride molten salt electrolyte is a KF-based fluoride salt, wherein the average ionic radius of the cation is not less than 150 nm.

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