A method for producing vanadium-nitrogen alloy by using powder vanadium instead of part flake vanadium and vanadium-nitrogen alloy

Abstract

The present application provides a kind of method for producing vanadium-nitrogen alloy by replacing part of sheet vanadium with powder vanadium and vanadium-nitrogen alloy, the method comprises: replacing part of sheet vanadium with powder vanadium to be matched into vanadium-nitrogen alloy production line to carry out mixing, balling and nitriding reduction reaction in turn, to obtain vanadium-nitrogen alloy;Wherein, the proportion of powder vanadium replacing part of sheet vanadium is 8-12wt%.The present application produces vanadium-nitrogen alloy by replacing part of sheet vanadium with powder vanadium, which avoids the high purity required by using all sheet vanadium, and also avoids the fine particle size and high energy consumption required by using all powder vanadium.By reasonably limiting the matching ratio between powder vanadium and sheet vanadium, the purity requirement of raw materials is reduced, and the early grinding period is shortened, thereby saving energy consumption and cost, which is conducive to large-scale popularization and application.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical technology and relates to a method for producing vanadium-nitrogen alloys, and more particularly to a method for producing vanadium-nitrogen alloys by using vanadium powder to replace part of the vanadium flakes, and the vanadium-nitrogen alloy itself. Background Technology

[0002] Vanadium-nitrogen alloys, as a novel alloying additive, can replace ferrovanadium in the production of microalloyed steel. Adding vanadium-nitrogen alloys to steel significantly improves its overall mechanical properties, including strength, toughness, ductility, and resistance to thermal fatigue, while also enhancing its weldability. To achieve the same strength, adding vanadium-nitrogen alloys can save approximately 30-40% of the vanadium required, thereby reducing production costs.

[0003] Currently, the production of vanadium-nitrogen alloys mainly uses flake vanadium pentoxide, or flake vanadium for short, with a chemical composition of V₂O₅ ≥ 98wt%. It is produced by flash dehydration, calcination deammoniation, and melting and casting of ammonium vanadate in the melting section. Existing technologies also employ powdered vanadium to produce vanadium-nitrogen alloys. First, the flake vanadium is ground into powder using a European-style mill, controlling the particle size to 200 mesh with a 90% passing rate. Then, green pellets made from vanadium pentoxide, carbon powder, activators, and other raw materials are subjected to high-temperature treatment under nitrogen protection to react and generate the vanadium-nitrogen alloy. These methods require high purity and particle size of the powdered vanadium, and the process is relatively complex with a long production cycle.

[0004] CN102556985A discloses a production process for vanadium nitride, the main process being: batching-bulking-drying-pre-reduction-reduction-carbonization-nitriding-cooling. First, powdered V2O5, carbon powder, and a polyvinyl alcohol aqueous solution are mixed evenly. Then, the evenly mixed raw material is briquetting on a briquetting machine. The green briquettes are fed into a walking beam tunnel kiln from one end for drying and pre-reduction. The pre-reduced charge is directly fed into a pusher kiln for reduction, carbonization, and nitriding. After nitriding in the pusher kiln, the charge undergoes a cooling process, and is discharged from the kiln when the charge temperature is below 150℃. However, the above process requires the powdered V2O5 to have a purity of over 98%, and the pre-treatment cycle for using only powdered vanadium is relatively long, requiring all vanadium flakes to be ground into powder. The process is cumbersome, and energy consumption and production costs are high.

[0005] CN101289713A discloses a method for producing vanadium-nitrogen alloy. Vanadium pentoxide is finely ground, then mixed with iron powder, carbon powder, and a binder to form spherical particles. These particles are then fed into a horizontal pusher kiln, where nitrogen gas is introduced and a slight positive pressure is maintained. The particles undergo carbonization and nitriding reactions within the kiln to produce the vanadium-nitrogen alloy. However, this method also suffers from drawbacks such as high requirements for vanadium powder purity, long initial grinding cycles, high energy consumption, and high production costs, leaving considerable room for improvement.

[0006] Therefore, it is evident that providing a method for producing vanadium-nitrogen alloys that reduces the purity requirements of raw materials and shortens the initial grinding cycle, thereby saving energy and costs, has become an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a method for producing vanadium-nitrogen alloys by using vanadium powder to replace part of the vanadium flakes, and the vanadium-nitrogen alloy itself. This reduces the purity requirements of the raw materials, shortens the initial grinding cycle, thereby saving energy and costs, and is conducive to large-scale promotion and application.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a method for producing vanadium-nitrogen alloy by using vanadium powder to replace part of the vanadium flakes, the method comprising: using vanadium powder to replace part of the vanadium flakes and incorporating it into a vanadium-nitrogen alloy production line for sequential mixing, briquetting, and nitriding reduction reaction to obtain vanadium-nitrogen alloy.

[0010] In this invention, the vanadium-nitrogen alloy production line is a conventionally used production line in the field. As long as the smooth production of vanadium-nitrogen alloy can be achieved, the specific process of the production line is not particularly limited. For example, the production line disclosed in CN113265546A can be used to produce vanadium-nitrogen alloy.

[0011] The proportion of vanadium powder replacing part of the vanadium flakes is 8-12 wt%, for example, it can be 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%, 10 wt%, 10.5 wt%, 11 wt%, 11.5 wt%, or 12 wt%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0012] In this invention, the proportion of vanadium powder replacing part of the vanadium flakes is specifically calculated based on the sum of the masses of vanadium powder and vanadium flakes, and this proportion must be strictly controlled within a reasonable range. When the proportion is below 8 wt%, that is, the amount of vanadium powder mixed is too small, the quality of the resulting vanadium-nitrogen alloy is poor; when the proportion is above 12 wt%, the improvement in the quality of the resulting vanadium-nitrogen alloy is not significant, but instead causes an unnecessary extension of the initial grinding cycle, and increases energy consumption and cost.

[0013] This invention utilizes vanadium powder to replace part of the vanadium flakes in the production of vanadium-nitrogen alloys. This avoids the high purity required by using only vanadium flakes, as well as the fine particle size and high energy consumption required by using only vanadium powder. By reasonably limiting the ratio of vanadium powder to vanadium flakes to within the range of 8-12 wt%, the purity requirements of the raw materials are reduced, the initial grinding cycle is shortened, thereby saving energy and costs, which is conducive to large-scale promotion and application.

[0014] Preferably, the V2O5 content in the vanadium powder is 94-95 wt%, for example, it can be 94 wt%, 94.1 wt%, 94.2 wt%, 94.3 wt%, 94.4 wt%, 94.5 wt%, 94.6 wt%, 94.7 wt%, 94.8 wt%, 94.9 wt%, or 95 wt%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0015] Preferably, the vanadium powder has a 200-mesh particle size passing rate of 80-90 wt%, for example, it can be 80 wt%, 81 wt%, 82 wt%, 83 wt%, 84 wt%, 85 wt%, 86 wt%, 87 wt%, 88 wt%, 89 wt%, or 90 wt%, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0016] This invention utilizes vanadium powder to replace part of the vanadium flakes in the production of vanadium-nitrogen alloys. The required vanadium powder contains 94-95 wt% V2O5, which is significantly lower than the purity requirement of ≥98 wt% V2O5 required when using all vanadium flakes. Furthermore, the required vanadium powder has a 200-mesh particle size passing rate of 80-90 wt%, which is also lower than the passing rate of over 90% required when using all vanadium powder. This shortens the initial grinding cycle and saves energy and costs.

[0017] Preferably, the vanadium powder is obtained by drying, calcining and grinding ammonium vanadate produced in the vanadium-nitrogen alloy production line.

[0018] Preferably, the drying temperature is 60-80℃, for example, it can be 60℃, 62℃, 64℃, 66℃, 68℃, 70℃, 72℃, 74℃, 76℃, 78℃ or 80℃, but it is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0019] Preferably, the drying time is 12-24 hours, for example, 12 hours, 13 hours, 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours, 20 hours, 21 hours, 22 hours, 23 hours or 24 hours, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0020] Preferably, the calcination temperature is 210-250℃, for example, it can be 210℃, 215℃, 220℃, 225℃, 230℃, 235℃, 240℃, 245℃ or 250℃, but it is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0021] Preferably, the calcination time is 4-8 hours, for example, it can be 4 hours, 4.5 hours, 5 hours, 5.5 hours, 6 hours, 6.5 hours, 7 hours, 7.5 hours or 8 hours, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0022] Preferably, the grinding is performed using a European-style mill.

[0023] Preferably, the vanadium-nitrogen alloy production line uses refined vanadium slag as raw material.

[0024] Preferably, the vanadium content of the refined vanadium slag is 12-15 wt%, for example, it can be 12 wt%, 12.5 wt%, 13 wt%, 13.5 wt%, 14 wt%, 14.5 wt%, or 15 wt%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0025] Preferably, the mixture comprises: mixed vanadium powder, vanadium flakes, carbon powder and activator to obtain a mixed material.

[0026] Preferably, the carbon powder includes graphite powder.

[0027] Preferably, the proportion of the toner in the mixture is 20-30 wt%, for example, it can be 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, or 30 wt%, but it is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0028] Preferably, the active agent accounts for 30-50 wt% of the mixture, for example, 30 wt%, 32 wt%, 34 wt%, 36 wt%, 38 wt%, 40 wt%, 42 wt%, 44 wt%, 46 wt%, 48 wt%, or 50 wt%, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0029] Preferably, the nitriding reduction reaction includes: placing the green pellets obtained after pelletizing into a pusher kiln and performing high-temperature treatment under nitrogen protection.

[0030] Preferably, the absolute pressure inside the pusher kiln is 50-150 Pa, for example, it can be 50 Pa, 60 Pa, 70 Pa, 80 Pa, 90 Pa, 100 Pa, 110 Pa, 120 Pa, 130 Pa, 140 Pa or 150 Pa, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0031] Preferably, the high-temperature treatment temperature is 1500-1800℃, for example, it can be 1500℃, 1550℃, 1600℃, 1650℃, 1700℃, 1750℃ or 1800℃, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0032] Preferably, the high-temperature treatment time is 10-20 hours, for example, it can be 10 hours, 11 hours, 12 hours, 13 hours, 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours or 20 hours, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0033] As a preferred technical solution of the first aspect of the present invention, the method includes the following steps:

[0034] (1) Select refined vanadium slag with a vanadium grade of 12-15wt% as the raw material for the vanadium-nitrogen alloy production line;

[0035] (2) Vanadium powder with a V2O5 content of 94-95wt% and a 200-mesh particle size passing rate of 80-90% is obtained by drying, calcining and grinding ammonium vanadate produced in the vanadium-nitrogen alloy production line; the drying temperature is 60-80℃ and the time is 12-24h; the calcination temperature is 210-250℃ and the time is 4-8h; the grinding is carried out using a European-style mill.

[0036] (3) Vanadium powder is used to replace part of the flake vanadium in a vanadium-nitrogen alloy production line at a ratio of 8-12 wt% to carry out mixing, pelletizing and nitriding reduction reaction in sequence to obtain vanadium-nitrogen alloy; wherein, the mixing includes: mixing vanadium powder, flake vanadium, carbon powder and activator to obtain a mixed material; the carbon powder includes graphite powder, accounting for 20-30 wt% in the mixed material; the activator accounts for 30-50 wt% in the mixed material; the nitriding reduction reaction includes: putting the green balls obtained after pelletizing into a pusher kiln and performing high-temperature treatment under nitrogen protection; the absolute pressure in the pusher kiln is 50-150 Pa, the temperature of the high-temperature treatment is 1500-1800℃, and the time is 15-20 h.

[0037] In a second aspect, the present invention provides a vanadium-nitrogen alloy, which is prepared by the method described in the first aspect.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] This invention utilizes vanadium powder to replace part of the vanadium flakes in the production of vanadium-nitrogen alloys. This avoids the high purity required by using only vanadium flakes, as well as the fine particle size and high energy consumption required by using only vanadium powder. By reasonably limiting the ratio of vanadium powder to vanadium flakes to within the range of 8-12 wt%, the purity requirements of the raw materials are reduced, the initial grinding cycle is shortened, thereby saving energy and costs, which is conducive to large-scale promotion and application. Attached Figure Description

[0040] Figure 1 This is a process flow diagram of the production of vanadium-nitrogen alloys using vanadium powder to replace part of the vanadium flakes, provided by the present invention. Detailed Implementation

[0041] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention.

[0042] Example 1

[0043] This embodiment provides a method for producing vanadium-nitrogen alloys by replacing part of the vanadium flakes with vanadium powder. The method includes the following steps:

[0044] (1) Select vanadium slag with a vanadium grade of 13.5 wt% as the raw material for the vanadium-nitrogen alloy production line;

[0045] (2) Utilize, for example Figure 1 The ammonium vanadate produced in the vanadium-nitrogen alloy production line shown is dried, calcined, and ground to obtain vanadium powder with a V2O5 content of 94.5 wt% and a 200-mesh particle size passing rate of 85%. The drying temperature is 70°C and the time is 18 h. The calcination temperature is 230°C and the time is 6 h. The grinding is carried out using a European-style mill.

[0046] (3) Vanadium powder is used to replace part of the vanadium flakes in a vanadium-nitrogen alloy production line at a ratio of 10 wt% to carry out mixing, briquetting, and nitriding reduction reaction in sequence to obtain vanadium-nitrogen alloy; wherein, the mixing includes: mixing vanadium powder, vanadium flakes, graphite powder and activator to obtain a mixture; the proportion of graphite powder in the mixture is 25 wt%; the activator is a 3.5 wt% polyvinyl alcohol aqueous solution, which accounts for 40 wt% of the mixture; the nitriding reduction reaction includes: putting the green balls obtained after briquetting into a pusher kiln and performing high-temperature treatment under nitrogen protection; the absolute pressure in the pusher kiln is 100 Pa, the temperature of the high-temperature treatment is 1650 °C, and the time is 18 h.

[0047] The remaining steps and conditions of the vanadium-nitrogen alloy production line used in this embodiment refer to the technical solution disclosed in Embodiment 1 of CN113265546A, and therefore will not be described in detail here.

[0048] Example 2

[0049] This embodiment provides a method for producing vanadium-nitrogen alloys by replacing part of the vanadium flakes with vanadium powder. The method includes the following steps:

[0050] (1) Select vanadium slag with a vanadium grade of 12wt% as the raw material for the vanadium-nitrogen alloy production line;

[0051] (2) Utilize, for example Figure 1 The ammonium vanadate produced in the vanadium-nitrogen alloy production line shown is dried, calcined, and ground to obtain vanadium powder with a V2O5 content of 94wt% and a 200-mesh particle size passing rate of 80%. The drying temperature is 60℃ and the time is 24h; the calcination temperature is 210℃ and the time is 8h; the grinding is carried out using a European-style mill.

[0052] (3) Vanadium powder is used to replace part of the vanadium flakes in a ratio of 8wt% and is added to the vanadium-nitrogen alloy production line for mixing, briquetting, and nitriding reduction reaction in sequence to obtain vanadium-nitrogen alloy; wherein, the mixing includes: mixing vanadium powder, vanadium flakes, graphite powder and activator to obtain a mixture; the proportion of graphite powder in the mixture is 20wt%; the activator is a 2wt% polyvinyl alcohol aqueous solution, which accounts for 50wt% of the mixture; the nitriding reduction reaction includes: putting the green balls obtained after briquetting into a pusher kiln and performing high-temperature treatment under nitrogen protection; the absolute pressure in the pusher kiln is 50Pa, the temperature of the high-temperature treatment is 1800℃, and the time is 15h.

[0053] The remaining steps and conditions of the vanadium-nitrogen alloy production line used in this embodiment refer to the technical solution disclosed in Embodiment 1 of CN113265546A, and therefore will not be described in detail here.

[0054] Example 3

[0055] This embodiment provides a method for producing vanadium-nitrogen alloys by replacing part of the vanadium flakes with vanadium powder. The method includes the following steps:

[0056] (1) Select vanadium slag with a vanadium grade of 15wt% as the raw material for the vanadium-nitrogen alloy production line;

[0057] (2) Utilize, for example Figure 1 The ammonium vanadate produced in the vanadium-nitrogen alloy production line shown is dried, calcined, and ground to obtain vanadium powder with a V2O5 content of 95wt% and a 200-mesh particle size passing rate of 90%. The drying temperature is 80℃ and the time is 12h. The calcination temperature is 250℃ and the time is 4h. The grinding is carried out using a European-style mill.

[0058] (3) Vanadium powder is used to replace part of the vanadium flakes in a vanadium-nitrogen alloy production line at a ratio of 12wt%, and the mixture, pelletizing and nitriding reduction reaction are carried out sequentially to obtain vanadium-nitrogen alloy; wherein, the mixture includes: mixing vanadium powder, vanadium flakes, graphite powder and activator to obtain a mixture; the graphite powder accounts for 30wt% of the mixture; the activator is a 5wt% polyvinyl alcohol aqueous solution, which accounts for 30wt% of the mixture; the nitriding reduction reaction includes: putting the green pellets obtained after pelletizing into a pusher kiln and performing high-temperature treatment under nitrogen protection; the absolute pressure in the pusher kiln is 150Pa, the temperature of the high-temperature treatment is 1500℃, and the time is 20h.

[0059] The remaining steps and conditions of the vanadium-nitrogen alloy production line used in this embodiment refer to the technical solution disclosed in Embodiment 1 of CN113265546A, and therefore will not be described in detail here.

[0060] Example 4

[0061] This embodiment provides a method for producing vanadium-nitrogen alloys by replacing part of the vanadium flakes with vanadium powder. Except for reducing the V2O5 content in the vanadium powder to 93%, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0062] Example 5

[0063] This embodiment provides a method for producing vanadium-nitrogen alloys by replacing part of the vanadium flakes with vanadium powder. Except for increasing the V2O5 content in the vanadium powder to 96%, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0064] Example 6

[0065] This embodiment provides a method for producing vanadium-nitrogen alloys by replacing part of the vanadium flakes with vanadium powder. Except for reducing the 200-mesh particle size pass rate of the vanadium powder to 75wt%, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0066] Example 7

[0067] This embodiment provides a method for producing vanadium-nitrogen alloys by replacing part of the vanadium flakes with vanadium powder. Except for increasing the 200-mesh particle size pass rate of the vanadium powder to 95wt%, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0068] Comparative Example 1

[0069] This comparative example provides a method for producing vanadium-nitrogen alloys by replacing part of the vanadium flakes with vanadium powder. Except for reducing the proportion of vanadium powder replacing part of the vanadium flakes to 6 wt%, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0070] Comparative Example 2

[0071] This comparative example provides a method for producing vanadium-nitrogen alloys. Except that all the vanadium sheets are used, the other steps and conditions are the same as in Example 1, so they will not be described again here.

[0072] Comparative Example 3

[0073] This comparative example provides a method for producing vanadium-nitrogen alloys by replacing part of the vanadium flakes with vanadium powder. Except for increasing the proportion of vanadium powder replacing part of the vanadium flakes to 14 wt%, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0074] Comparative Example 4

[0075] This comparative example provides a method for producing vanadium-nitrogen alloys. Except that all the steps and conditions are the same as in Example 1, except that vanadium powder is used. Therefore, they will not be described in detail here.

[0076] The quality of the vanadium-nitrogen alloys obtained in Examples 1-7 and Comparative Examples 1-4 was tested. Specific testing methods included: determining the vanadium content in the vanadium-nitrogen alloys using the ferrous ammonium sulfate titration method according to GB / T 24583.1-2019; and determining the nitrogen content in the vanadium-nitrogen alloys using the inert gas melting thermal conductivity method according to GB / T24583.2-2019. Specific test results are shown in Table 1 below.

[0077] Table 1

[0078]

[0079]

[0080] As shown in Table 1, Examples 1-7 utilize vanadium powder to replace part of the vanadium flakes in the production of vanadium-nitrogen alloys. This avoids the high purity required by using only vanadium flakes, as well as the fine particle size and high energy consumption required by using only vanadium powder. By reasonably limiting the ratio of vanadium powder to vanadium flakes to within the range of 8-12 wt%, and with the V2O5 content in the vanadium powder being 94-95 wt% and the 200-mesh particle size passing rate being 80-90 wt%, the purity requirements of the raw materials are significantly reduced, the initial grinding cycle is shortened, thereby saving energy consumption and costs, which is conducive to large-scale promotion and application.

[0081] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for producing vanadium-nitrogen alloys by replacing part of the vanadium flakes with vanadium powder, characterized in that, The method includes: using vanadium powder to replace part of the vanadium flakes and adding it into the vanadium-nitrogen alloy production line for sequential mixing, briquetting and nitriding reduction reaction to obtain vanadium-nitrogen alloy; The proportion of vanadium powder replacing vanadium flakes is 8-12 wt%; the V2O5 content in the vanadium powder is 94-95 wt%; the 200-mesh particle size passing rate of the vanadium powder is 80-90 wt%; the vanadium powder is obtained from ammonium vanadate produced in the vanadium-nitrogen alloy production line through drying, calcination, and grinding; the drying temperature is 60-80℃; the drying time is 12-24 h; the calcination temperature is 210-250℃; and the calcination time is 4-8 h.

2. The method according to claim 1, characterized in that, The grinding was performed using a European-style mill.

3. The method according to claim 1, characterized in that, The vanadium-nitrogen alloy production line uses refined vanadium slag as raw material.

4. The method according to claim 3, characterized in that, The vanadium content of the refined vanadium slag is 12-15 wt%.

5. The method according to claim 1, characterized in that, The mixture comprises: mixed vanadium powder, vanadium flakes, carbon powder and activator to obtain a mixed material.

6. The method according to claim 5, characterized in that, The carbon powder includes graphite powder.

7. The method according to claim 5, characterized in that, The carbon powder accounts for 20-30 wt% of the mixture.

8. The method according to claim 5, characterized in that, The active agent accounts for 30-50 wt% of the mixture.

9. The method according to claim 1, characterized in that, The nitriding reduction reaction includes: placing the green pellets obtained after pelletizing into a pusher kiln and performing high-temperature treatment under nitrogen protection.

10. The method according to claim 9, characterized in that, The absolute pressure inside the pusher kiln is 50-150 Pa.

11. The method according to claim 9, characterized in that, The high-temperature treatment is performed at a temperature of 1500-1800℃.

12. The method according to claim 9, characterized in that, The high-temperature treatment time is 10-20 hours.

13. The method according to claim 1, characterized in that, The method includes the following steps: (1) Select refined vanadium slag with a vanadium grade of 12-15 wt% as the raw material for the vanadium-nitrogen alloy production line; (2) Vanadium powder with a V2O5 content of 94-95wt% and a 200-mesh particle size passing rate of 80-90% is obtained by drying, calcining and grinding ammonium vanadate produced in the vanadium-nitrogen alloy production line; the drying temperature is 60-80℃ and the time is 12-24h; the calcination temperature is 210-250℃ and the time is 4-8h; the grinding is carried out using a European-style mill. (3) Vanadium powder is used to replace part of the vanadium flakes in a ratio of 8-12 wt% and is added to the vanadium-nitrogen alloy production line for mixing, briquetting and nitriding reduction reaction in sequence to obtain vanadium-nitrogen alloy; wherein, the mixing includes: mixing vanadium powder, vanadium flakes, carbon powder and activator to obtain a mixture; the carbon powder includes graphite powder, and the proportion of carbon powder in the mixture is 20-30 wt%; the proportion of activator in the mixture is 30-50 wt%; the nitriding reduction reaction includes: putting the green balls obtained after briquetting into a pusher kiln and performing high-temperature treatment under nitrogen protection; the absolute pressure in the pusher kiln is 50-150 Pa, the temperature of the high-temperature treatment is 1500-1800℃, and the time is 15-20 h.

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