A method for preparing high-purity metallic vanadium with ultra-low oxygen concentration

Abstract

This invention discloses a method for preparing ultra-low oxygen metallic vanadium. First, vanadium oxide and aluminum powder are used as raw materials, with aluminum-calcium alloy particles added as a composite reducing agent and synergistic deoxidizer to prepare a low-oxygen vanadium-aluminum alloy. Electron beam melting is then used to deeply remove metallic impurities such as aluminum, calcium, and iron, resulting in a dense, high-purity, low-oxygen vanadium plate. Next, the vanadium plate undergoes low-temperature vacuum diffusion deoxidation with calcium powder embedding to deeply remove dissolved oxygen in the crystal lattice, ultimately obtaining ultra-low oxygen high-purity metallic vanadium. This invention overcomes the deoxidation limit of V-O solid solutions through a three-stage coupling of aluminum-calcium synergistic reduction, electron beam refining, and calcium embedding low-temperature deoxidation. The process is short, highly synergistic, and suitable for industrial production. The resulting high-purity metallic vanadium has an oxygen content ≤30ppm and a purity ≥99.9%, making it suitable for high-end fields such as radio frequency superconducting cavities, magnetron sputtering targets, nuclear industry structural materials, and superconducting electronic devices.

Description

Technical Field

[0001] This invention relates to the field of high-purity metal metallurgy technology, specifically to a method for preparing high-purity metallic vanadium with ultra-low oxygen concentration. Background Technology

[0002] Vanadium, as an important strategic non-ferrous metal, plays an irreplaceable role in fields such as radio frequency superconducting cavities, semiconductor sputtering targets, aerospace, and nuclear industries due to its characteristics such as small fast neutron capture cross-section, excellent resistance to liquid sodium corrosion, and high-temperature creep resistance. However, with the increasing demands on vanadium materials for high-end equipment and key components in the nuclear industry, oxygen, as the main interstitial impurity in vanadium, readily forms brittle oxide phases, significantly deteriorating the material's plasticity, superconductivity, and radiation resistance.

[0003] Vanadium, a rare, high-melting-point, and reactive metal, exhibits strong binding affinity to interstitial impurities, especially oxygen impurities, readily forming a structurally stable VO solid solution. Creating suitable deoxidation conditions using conventional smelting techniques alone is extremely difficult. The aluminothermic reduction method is currently the most widely used technique for preparing vanadium. It involves first preparing a vanadium-aluminum master alloy using excess aluminum, followed by electron beam refining to produce metallic vanadium. However, aluminum has limited deoxidizing capacity, resulting in a high oxygen content in the prepared vanadium-aluminum master alloy, and the electron beam refining process is ineffective at removing dissolved oxygen. Existing technologies struggle to stably prepare ultra-low oxygen vanadium with an oxygen content ≤30 ppm, severely hindering the independent development of key areas such as my country's nuclear industry and radio frequency superconductivity. Therefore, developing a stable, ultra-low oxygen high-purity vanadium preparation technology capable of deep removal of dissolved oxygen is urgently needed. Summary of the Invention

[0004] Purpose of the invention: To address the shortcomings of existing technologies, this invention provides a method for preparing high-purity metallic vanadium with ultra-low oxygen concentration.

[0005] Technical solution: This invention provides a method for preparing ultra-low oxygen metallic vanadium, comprising the following steps:

[0006] Step 1: Preparation of low-oxygen vanadium-aluminum alloy by vacuum aluminothermic reduction

[0007] Using vanadium oxide (preferably vanadium pentoxide) and aluminum powder as raw materials, aluminum oxide is added as a buffer, and aluminum-calcium alloy particles are added as a composite reducing agent and synergistic deoxidizer. The particle size of the aluminum-calcium alloy particles is 0.1~2mm, and the calcium content is 10wt%~20wt%. The mass ratio of each raw material is: vanadium oxide: aluminum powder: aluminum oxide: aluminum-calcium alloy particles = 1 :(0.5~0.7) : (0.1~0.2) : (0.02~0.04). The prepared materials are mixed in a mixer for 30min, and then dried in a drying and roasting machine at 150℃ for 5h for later use. The mixed materials are put into a vacuum reactor, evacuated to 50Pa, and argon gas is introduced to 0.05~0.07MPa. The reaction is initiated by ignition, and after cooling and removal from the furnace, a low-oxygen vanadium-aluminum alloy is obtained.

[0008] In this step, the purpose of adding aluminum-calcium alloy particles is to: utilize the strong deoxidizing properties of calcium to lower the deoxidation limit of the reaction; simultaneously, calcium reacts with aluminum oxides to form low-melting-point calcium aluminate slag, increasing slag fluidity, making slag-metal separation more thorough, and improving vanadium recovery rate. Compared to directly adding metallic calcium, calcium-aluminum alloy particles are safer and more stable, while also delaying calcium volatilization and exhibiting higher deoxidation efficiency.

[0009] Step 2, Electron beam melting and purification

[0010] The low-oxygen vanadium-aluminum alloy obtained in step one is fed into an electron beam melting furnace, and a vacuum of 10⁻²~10⁻³ Pa is applied. The melting power is 100~200kW, and the melting time is 1~2 hours. This process deeply removes metallic impurities such as aluminum, calcium, and iron, as well as some oxygen impurities, while simultaneously densifying the vanadium matrix to obtain a dense, high-purity, low-oxygen vanadium plate.

[0011] Electron beam melting can not only effectively remove metal impurities and significantly improve the matrix purity of vanadium metal, but also, the higher the purity of the vanadium matrix, the fewer the lattice defects, which is more conducive to the uniform diffusion of oxygen atoms from the interior of the vanadium metal to the surface during the subsequent calcium heat treatment stage, thus achieving a positive synergistic effect between high-purity matrix and deep deoxidation.

[0012] Step 3: Calcium embedding, low-temperature vacuum diffusion deoxygenation

[0013] Using a conventional vacuum furnace, first, a layer of calcium granules is placed at the bottom of the crucible. Then, the vanadium plate obtained in step two is placed on top of the calcium granules. Finally, another layer of calcium granules is placed on the surface of the vanadium plate to ensure that it is completely covered. The furnace is evacuated to 10⁻²~10⁻³ Pa, heated to 500~700℃, and held at that temperature for 4~8 hours. After cooling in the furnace, the deoxidized vanadium plate is obtained. The preferred amount of calcium granules added is 2%~3% of the vanadium plate's mass.

[0014] The principle behind this step is that calcium can reduce the partial pressure of oxygen in the system and form a slightly molten state at low temperatures. Due to the internal electron transitions and atomic collisions, calcium in the slightly molten state has higher chemical activity. It first reacts with the oxygen and oxide layer on the surface of the vanadium plate, reducing the oxygen concentration on its surface. This creates an oxygen concentration gradient inside the vanadium plate, promoting the migration of oxygen impurities from the inside out, and ultimately achieving deep removal of dissolved oxygen from the crystal lattice.

[0015] Step 4, Post-processing

[0016] The deoxidized vanadium plate is first acid-washed with 5%~10% dilute nitric acid for 5~15 minutes, then rinsed with tap water for 2~3 minutes, then rinsed once with deionized water, and finally vacuum-dried at 80~120℃ for 4~6 hours under vacuum conditions of ≤10Pa to obtain ultra-low oxygen high-purity metallic vanadium product.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. During the aluminothermic reduction stage, a certain amount of aluminum-calcium alloy particles are added. Calcium's strong deoxidizing properties lower the deoxidation limit of the reaction, while also modifying inclusions. The generated CaO can react with Al2O3 to form low-melting-point calcium aluminate slag, increasing slag fluidity and improving slag-metal separation, thus increasing vanadium recovery. Compared to directly adding metallic calcium, calcium-aluminum alloy particles are safer and more stable, while also delaying calcium volatilization and exhibiting higher deoxidation efficiency.

[0019] 2. The electron beam melting stage can not only effectively remove metallic impurities such as aluminum, calcium, and iron, as well as some oxygen impurities, significantly improving the matrix purity of vanadium metal; at the same time, the higher the purity of the vanadium matrix, the fewer lattice defects, which is more conducive to the uniform diffusion of oxygen atoms from the interior of the vanadium metal to the surface in the subsequent calcium heat treatment stage, realizing a positive synergistic effect of high-purity matrix and deep deoxidation.

[0020] 3. In the calcium-embedded deep deoxidation stage, calcium can reduce the oxygen partial pressure in the system and will coat the vanadium plate surface in a molten state. Due to the internal electron transition and atomic collision, the calcium in the low-temperature micro-molten state has higher chemical activity. It first reacts with the oxygen and oxide layer on the surface of the vanadium plate, reducing the oxygen concentration on its surface, forming an oxygen concentration gradient inside the vanadium plate, promoting the migration of oxygen impurities from the inside to the outside, and finally achieving deep deoxidation. Detailed Implementation

[0021] The following are embodiments to illustrate the present invention in detail, but the scope of protection of the present invention is not limited to the embodiments described.

[0022] Example 1

[0023] Step 1: Ingredients: Mix vanadium pentoxide, aluminum powder, aluminum oxide, and calcium aluminum alloy particles in a mass ratio of 1:0.7:0.2:0.04. Mix in a mixer for 30 minutes, and then dry in a drying and roasting machine at 150℃ for 5 hours for later use.

[0024] Step 2: Aluminothermic reduction: 60 kg of the mixed material is put into a vacuum reactor, vacuumed to 50 Pa, argon gas is introduced to 0.06 MPa, ignition is started to begin the reaction, and after cooling and removing the furnace, the surface slag is cleaned to obtain a low-oxygen aluminum-vanadium intermediate alloy.

[0025] Step 3: Electron beam melting: 105 kg of aluminum-vanadium alloy is spread evenly in a water-cooled copper crucible, vacuumed to 2 × 10-3 Pa, melting power is 200 kW, time is 2 h, and after natural cooling in the furnace, a dense high-purity low-oxygen vanadium plate is obtained.

[0026] Step 4: Calcium Embedding Vacuum Deoxidation: Using a conventional vacuum heat treatment furnace, the amount of calcium particles added is 3% of the vanadium plate, divided into two portions. One portion is evenly spread at the bottom of the crucible, then the vanadium plate from Step 3 is placed on top, and the remaining calcium particles are spread on the surface of the vanadium plate to ensure that the vanadium plate is completely covered. The vacuum is drawn to 2×10-3 Pa, the temperature is raised to 600℃ and held for 8 hours, and then the furnace is allowed to cool naturally. After being taken out of the furnace, the calcium-coated vanadium plate is obtained.

[0027] Step 5: Pickle the vanadium plate from Step 4 with 10% dilute nitric acid for 15 minutes, rinse the surface with tap water, then rinse with deionized water, and dry at 120℃ for 5 hours under 0.1Pa vacuum to obtain a high-purity, low-oxygen vanadium plate.

[0028] The chemical composition of the high-purity vanadium plate prepared in this embodiment, as determined by empirical analysis, is shown in the table below:

[0029] element / % V Al Ca Fe C O aluminothermic reduction 82.79 17.01 0.083 0.071 0.011 0.121 Electron beam melting - 0.016 ＜0.001 0.010 0.0020 0.016 Calcium embedding deoxygenation - 0.014 ＜0.001 0.012 0.0023 0.0028

[0030] Example 2

[0031] Step 1: Ingredients: Mix vanadium pentoxide, aluminum powder, aluminum oxide, and calcium aluminum alloy particles in a mass ratio of 1:0.5:0.1:0.02, mix in a mixer for 30 minutes, and then dry in a drying and roasting machine at 150℃ for 5 hours for later use.

[0032] Step 2: Aluminothermic reduction: 60 kg of the mixed material is put into a vacuum reactor, vacuumed to 50 Pa, argon gas is introduced to 0.06 MPa, ignition is started to begin the reaction, and after cooling and removing the furnace, the surface slag is cleaned to obtain a low-oxygen aluminum-vanadium intermediate alloy.

[0033] Step 3: Electron beam melting: 105 kg of aluminum-vanadium alloy is spread evenly in a water-cooled copper crucible, vacuumed to 5 × 10-3 Pa, melting power is 120 kW, time is 1 h, and after natural cooling in the furnace, a dense high-purity low-oxygen vanadium plate is obtained.

[0034] Step 4: Calcium Embedding Vacuum Deoxidation: Using a conventional vacuum heat treatment furnace, the amount of calcium particles added is 2% of the vanadium plate, divided into two portions. One portion is evenly spread at the bottom of the crucible, then the vanadium plate from Step 3 is placed on top, and the remaining calcium particles are spread on the surface of the vanadium plate to ensure that the vanadium plate is completely covered. The vacuum is drawn to 5×10-3 Pa, the temperature is raised to 500℃ and held for 8 hours, and then the furnace is allowed to cool naturally. After being taken out of the furnace, the calcium-coated vanadium plate is obtained.

[0035] Step 5: Pickle the vanadium plate from Step 4 with 10% dilute nitric acid for 15 minutes, rinse the surface with tap water, then rinse with deionized water, and dry at 120℃ for 5 hours under 0.1Pa vacuum to obtain a high-purity, low-oxygen vanadium plate.

[0036] The chemical composition of the high-purity vanadium plate prepared in this embodiment, as determined by empirical analysis, is shown in the table below:

[0037] element V Al Ca Fe C O aluminothermic reduction 81.43 17.86 0.065 0.091 0.012 0.143 Electron beam melting - 0.022 ＜0.001 0.018 0.0028 0.023 Calcium embedding deoxygenation - 0.024 ＜0.001 0.020 0.0026 0.005

[0038] Example 3

[0039] Step 1: Ingredients: Mix vanadium pentoxide, aluminum powder, aluminum oxide, and calcium aluminum alloy particles in a mass ratio of 1:0.6:0.15:0.03. Mix in a mixer for 30 minutes, and then dry in a drying and roasting machine at 150℃ for 5 hours for later use.

[0040] Step 2: Aluminothermic reduction: 60 kg of the mixed material is put into a vacuum reactor, vacuumed to 50 Pa, argon gas is introduced to 0.06 MPa, ignition is started to begin the reaction, and after cooling and removing the furnace, the surface slag is cleaned to obtain a low-oxygen aluminum-vanadium intermediate alloy.

[0041] Step 3: Electron beam melting: 105 kg of aluminum-vanadium alloy is spread evenly in a water-cooled copper crucible, vacuumed to 5 × 10-3 Pa, melting power is 150 kW, time is 2 h, and after natural cooling in the furnace, a dense high-purity low-oxygen vanadium plate is obtained.

[0042] Step 4: Calcium Embedding Vacuum Deoxidation: Using a conventional vacuum heat treatment furnace, the amount of calcium particles added is 2% of the vanadium plate, divided into two portions. One portion is evenly spread at the bottom of the crucible, then the vanadium plate from Step 3 is placed on top, and the remaining calcium particles are spread on the surface of the vanadium plate to ensure that the vanadium plate is completely covered. The vacuum is drawn to 5×10-3 Pa, the temperature is raised to 700℃ and held for 8 hours, and then the furnace is allowed to cool naturally. After being taken out of the furnace, the calcium-coated vanadium plate is obtained.

[0043] Step 5: Pickle the vanadium plate from Step 4 with 10% dilute nitric acid for 15 minutes, rinse the surface with tap water, then rinse with deionized water, and dry at 120℃ for 5 hours under 0.1Pa vacuum to obtain a high-purity, low-oxygen vanadium plate.

[0044] The chemical composition of the high-purity vanadium plate prepared in this embodiment, as determined by empirical analysis, is shown in the table below:

[0045] element / % V Al Ca Fe C O aluminothermic reduction 82.52 17.23 0.072 0.079 0.010 0.135 Electron beam melting - 0.019 ＜0.001 0.014 0.0025 0.02 Calcium embedding deoxygenation - 0.018 ＜0.001 0.012 0.0024 0.0039

[0046] Comparative Example 1 (without Ca-Al alloy)

[0047] Step 1: Ingredients: Mix vanadium pentoxide, aluminum powder, and aluminum oxide in a mass ratio of 1:0.7:0.2, mix in a mixer for 30 minutes, and then dry in a drying and roasting machine at 150℃ for 5 hours for later use.

[0048] Step 2: Aluminothermic reduction: 60 kg of the mixed material is put into a vacuum reactor, vacuumed to 50 Pa, argon gas is introduced to 0.06 MPa, ignition is started to begin the reaction, and after cooling and removing the furnace, the surface slag is cleaned to obtain a low-oxygen aluminum-vanadium intermediate alloy.

[0049] Step 3: Electron beam melting: 105 kg of aluminum-vanadium alloy is spread evenly in a water-cooled copper crucible, vacuumed to 2 × 10-3 Pa, melting power is 200 kW, time is 2 h, and after natural cooling in the furnace, a dense high-purity low-oxygen vanadium plate is obtained.

[0050] Step 4: Calcium Embedding Vacuum Deoxidation: Using a conventional vacuum heat treatment furnace, the amount of calcium particles added is 3% of the vanadium plate, divided into two portions. One portion is evenly spread at the bottom of the crucible, then the vanadium plate from Step 3 is placed on top, and the remaining calcium particles are spread on the surface of the vanadium plate to ensure that the vanadium plate is completely covered. The vacuum is drawn to 2×10-3 Pa, the temperature is raised to 600℃ and held for 8 hours, and then the furnace is allowed to cool naturally. After being taken out of the furnace, the calcium-coated vanadium plate is obtained.

[0051] Step 5: Pickle the vanadium plate from Step 4 with 10% dilute nitric acid for 15 minutes, rinse the surface with tap water, then rinse with deionized water, and dry at 120℃ for 5 hours under 0.1Pa vacuum to obtain a high-purity, low-oxygen vanadium plate.

[0052] The chemical composition of the high-purity vanadium plate prepared in this embodiment, as determined by empirical analysis, is shown in the table below:

[0053] element / % V Al Ca Fe C O aluminothermic reduction 81.56 16.98 ＜0.001 0.081 0.013 0.221 Electron beam melting - 0.021 ＜0.001 0.014 0.0026 0.042 Calcium embedding deoxygenation - 0.020 ＜0.001 0.013 0.0030 0.0065

[0054] Comparative Example 2 (Calcium coating temperature 400℃)

[0055] Step 1: Ingredients: Mix vanadium pentoxide, aluminum powder, aluminum oxide, and calcium aluminum alloy particles in a mass ratio of 1:0.7:0.2:0.04. Mix in a mixer for 30 minutes, and then dry in a drying and roasting machine at 150℃ for 5 hours for later use.

[0056] Step 2: Aluminothermic reduction: 60 kg of the mixed material is put into a vacuum reactor, vacuumed to 50 Pa, argon gas is introduced to 0.06 MPa, ignition is started to begin the reaction, and after cooling and removing the furnace, the surface slag is cleaned to obtain a low-oxygen aluminum-vanadium intermediate alloy.

[0057] Step 3: Electron beam melting: 105 kg of aluminum-vanadium alloy is spread evenly in a water-cooled copper crucible, vacuumed to 2 × 10-3 Pa, melting power is 200 kW, time is 2 h, and after natural cooling in the furnace, a dense high-purity low-oxygen vanadium plate is obtained.

[0058] Step 4: Calcium Embedding Vacuum Deoxidation: Using a conventional vacuum heat treatment furnace, the amount of calcium particles added is 3% of the vanadium plate, divided into two portions. One portion is evenly spread at the bottom of the crucible, then the vanadium plate from Step 3 is placed on top, and the remaining calcium particles are spread on the surface of the vanadium plate to ensure that the vanadium plate is completely covered. The vacuum is drawn to 2×10-3 Pa, the temperature is raised to 400℃ and held for 8 hours, and then the furnace is allowed to cool naturally. After being taken out of the furnace, the calcium-coated vanadium plate is obtained.

[0059] Step 5: Pickle the vanadium plate from Step 4 with 10% dilute nitric acid for 15 minutes, rinse the surface with tap water, then rinse with deionized water, and dry at 120℃ for 5 hours under 0.1Pa vacuum to obtain a high-purity, low-oxygen vanadium plate.

[0060] The chemical composition of the high-purity vanadium plate prepared in this embodiment, as determined by empirical analysis, is shown in the table below:

[0061] element / % V Al Ca Fe C O aluminothermic reduction 82.91 17.12 0.079 0.077 0.0115 0.128 Electron beam melting - 0.018 ＜0.001 0.015 0.0023 0.018 Calcium embedding deoxygenation - 0.019 ＜0.001 0.016 0.0021 0.016

[0062] Data from the examples and comparative studies show that adding Al-Ca alloy as a composite deoxidizer during the aluminothermic reduction stage is more conducive to obtaining high-grade, low-oxygen-content aluminum-vanadium alloys. Electron beam melting can effectively remove some metallic impurities, but the removal effect on oxygen impurities is generally limited. However, higher purity of the vanadium plate is more conducive to the removal of oxygen impurities in the subsequent calcium encapsulation deoxidation stage, achieving a positive synergistic effect between high-purity matrix and deep deoxidation. In the calcium particle encapsulation deoxidation stage, calcium particles at 600℃ can form a more active molten calcium that uniformly coats the surface of the vanadium plate, resulting in higher deoxidation efficiency and a stable reduction of oxygen content to below 30 ppm.

[0063] The above description is merely a preferred embodiment of this application and is not intended to limit this application.

Claims

1. A method for preparing ultra-low oxygen concentration high-purity vanadium metal, characterized in that, Includes the following steps: Step 1, preparation of low-oxygen vanadium-aluminum alloy by vacuum aluminothermic reduction: Vanadium oxide and aluminum powder are used as raw materials, aluminum oxide is added as a buffer, and aluminum-calcium alloy particles are added as a composite reducing agent and synergistic deoxidizer. After mixing, the mixture is subjected to vacuum aluminothermic reduction reaction to obtain low-oxygen vanadium-aluminum alloy; wherein the mass ratio of each raw material is: vanadium oxide: aluminum powder: aluminum oxide: aluminum-calcium alloy particles = 1 : (0.5~0.7) : (0.1~0.2) : (0.02~0.04); Step 2, Electron beam melting and purification: The low-oxygen vanadium-aluminum alloy obtained in Step 1 is subjected to electron beam melting under vacuum conditions to remove metal impurities and densify, resulting in a high-purity low-oxygen vanadium plate. Step 3, calcium-encapsulated low-temperature vacuum diffusion deoxidation: The high-purity, low-oxygen vanadium plate obtained in Step 2 is encapsulated in calcium particles, heated and kept warm under vacuum conditions to carry out deep diffusion deoxidation, and the deoxidized vanadium plate is obtained. Step 4, post-processing: The deoxidized vanadium plate is sequentially acid-washed, water-washed, deionized water-rinsed, and vacuum-dried to obtain ultra-low oxygen high-purity metallic vanadium.

2. The method for preparing ultra-low oxygen concentration high-purity metallic vanadium according to claim 1, characterized in that, In step 1, the vanadium oxide is vanadium pentoxide.

3. The method for preparing ultra-low oxygen concentration high-purity metallic vanadium according to claim 1, characterized in that, In step 1, the aluminum-calcium alloy particles have a particle size of 0.1~2mm and a calcium content of 10wt%~20wt%.

4. The method for preparing ultra-low oxygen concentration high-purity metallic vanadium according to claim 1, characterized in that, In step 1, the mixed material is dried at 150°C for 5 hours, then put into a vacuum reactor, evacuated to 50 Pa, and argon gas is introduced to 0.05~0.07 MPa. The reaction is ignited, and after cooling, a low-oxygen vanadium-aluminum alloy is obtained.

5. The method for preparing ultra-low oxygen concentration high-purity metallic vanadium according to claim 1, characterized in that, In step 2, the vacuum degree of electron beam melting is 10⁻²~10⁻³ Pa, the melting power is 100~200kW, and the melting time is 1~2h.

6. The method for preparing ultra-low oxygen concentration high-purity metallic vanadium according to claim 1, characterized in that, In step 3, the vanadium plate is placed between the calcium particles to ensure that the vanadium plate is completely covered; the vacuum degree is 10⁻²~10⁻³ Pa, the heating temperature is 500~700℃, the holding time is 4~8h, and the furnace is cooled.

7. The method for preparing ultra-low oxygen concentration high-purity metallic vanadium according to claim 1, characterized in that, In step 3, the amount of calcium particles added is 2% to 3% of the mass of the vanadium plate.

8. The method for preparing ultra-low oxygen concentration high-purity metallic vanadium according to claim 1, characterized in that, In step 4, the pickling uses dilute nitric acid with a concentration of 5% to 10% and the pickling time is 5 to 15 minutes.

9. The method for preparing ultra-low oxygen concentration high-purity metallic vanadium according to claim 1, characterized in that, In step 4, the vacuum drying conditions are: vacuum degree ≤ 10 Pa, temperature 80~120℃, and time 4~6 h.

10. The method for preparing ultra-low oxygen concentration high-purity metallic vanadium according to claim 1, characterized in that, The ultra-low oxygen high-purity metallic vanadium has an oxygen content of ≤30ppm and a purity of ≥99.9%.