Method for extracting vanadium from sodium vanadate solution while removing sodium and method for extracting vanadium from sodium vanadate by sodium roasting

Abstract

The application discloses a method for extracting vanadium and removing sodium from sodium vanadium liquid, and belongs to the field of vanadium oxide preparation. The method comprises the following steps: a: adding a vanadium increasing agent into the sodium vanadium liquid to adjust the sodium vanadium ratio, adding acid to adjust the pH value, and then adding ammonia-containing substance to adjust the ammonium vanadium ratio and the pH value, and after precipitation and solid-liquid separation, obtaining sodium ammonium vanadate precipitate and supernatant; b: passing carbon reduction gas into the sodium ammonium vanadate precipitate, and obtaining vanadium trioxide, sodium carbonate and ammonia-containing gas through reduction separation. The method uses sodium vanadium liquid as raw material, adds a vanadium increasing agent into the sodium vanadium liquid to increase the vanadium concentration, adjusts the pH value and adds ammonia-containing substance to realize the simultaneous extraction and removal of vanadium and sodium in the sodium vanadium liquid in the form of sodium ammonium vanadate, passes carbon reduction gas into the sodium ammonium vanadate to realize the effective separation of vanadium and sodium through reduction separation, and prepares high-purity vanadium trioxide product.

Description

Technical Field

[0001] This invention belongs to the field of vanadium oxide preparation, specifically relating to a method for extracting vanadium from sodium vanadium solution while simultaneously removing sodium, and a method for extracting vanadium by sodium roasting. Background Technology

[0002] Currently, there are two main vanadium extraction processes: calcification roasting and sodium roasting. The leaching solution obtained from sodium roasting clinker has a high sodium content, which is greater than or equal to the vanadium content. Therefore, hydrolysis and other reactions will occur during the vanadium precipitation process, resulting in high impurity content in the precipitated ammonium polyvanadate, which cannot meet product quality requirements. In addition, the wastewater has a high ammonia content, which requires costly treatment before recycling. Furthermore, the sodium sulfate produced by wastewater treatment cannot be used, resulting in high storage costs.

[0003] Therefore, how to recover sodium and vanadium from the leachate of sodium-roasted clinker, reduce wastewater treatment costs, and make rational use of solid waste are urgent problems to be solved in this field. Summary of the Invention

[0004] To address at least one of the problems in the prior art, the present invention provides a method for vanadium extraction from sodium vanadium solution while simultaneously removing sodium, and a method for vanadium extraction by sodium roasting.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] According to a first aspect of the present invention, a method for extracting vanadium from sodium vanadium solution while simultaneously removing sodium is provided, comprising the following steps:

[0007] a: Add vanadium enhancer to sodium vanadium solution to adjust sodium vanadium ratio, add acid to adjust pH value, and then add ammonia to adjust ammonium vanadium ratio and pH value. After precipitation and solid-liquid separation, sodium ammonium vanadate precipitate and supernatant are obtained.

[0008] b: A carbonaceous reducing gas is introduced into the sodium ammonium vanadate precipitate, and vanadium trioxide, sodium carbonate, and ammonia-containing gas are obtained by reduction and separation.

[0009] According to one embodiment of the present invention, in step a, a vanadium-enriching agent is added to adjust the sodium-vanadium molar ratio to 0.4-0.7:1, an acid is added to adjust the pH value to 1.5-5, and an ammonia-containing substance is added to adjust the ammonium-vanadium molar ratio to 1.5-3.5 and adjust the pH value to 9-13.

[0010] According to one embodiment of the present invention, in step a, the vanadium enhancer is at least one of ammonium polyvanadate, red cake, and vanadium pentoxide, the acid is sulfuric acid, and the ammonia-containing substance is at least one of ammonia-containing gas and ammonia water.

[0011] According to one embodiment of the present invention, in step a, the temperature of the vanadium sodium solution is 40-90°C, the temperature is adjusted to 10-60°C before adding acid to adjust the pH value, and the temperature is maintained at 10-60°C when adding the ammonia-containing substance.

[0012] According to one embodiment of the present invention, in step a, the precipitation time is 30 to 90 minutes.

[0013] According to one embodiment of the present invention, in step b, the carbonaceous reducing gas includes carbon monoxide, and the amount of carbonaceous reducing gas used is 1.5 to 5 based on the molar ratio of carbon monoxide in the carbonaceous reducing gas to vanadium in the sodium ammonium vanadate precipitate, and the reaction temperature is 550 to 700°C.

[0014] According to one embodiment of the present invention, step a further includes: washing the sodium ammonium vanadate precipitate obtained by solid-liquid separation, wherein the pH value of the washing water is 4-8, the temperature is 10-35°C, and the amount of washing water added is equal to the volume of the sodium vanadium solution.

[0015] According to one embodiment of the present invention, the ammonia-containing gas obtained in step b is returned as an ammonia-containing substance for vanadium extraction and sodium removal from the sodium vanadium solution.

[0016] According to a second aspect of the present invention, a method for vanadium extraction by sodium roasting is provided, comprising the following steps:

[0017] A. Sodium roasting process: Sodium roasting is performed on vanadium-containing raw materials to obtain sodium roasted clinker;

[0018] B. Leaching process: Leach the sodium-treated roasted clinker obtained in step A to obtain sodium-treated vanadium solution;

[0019] C. Vanadium Extraction and Sodium Removal Process: The sodium vanadium solution obtained in step B is subjected to vanadium extraction and sodium removal using the method described in the first aspect of the present invention, to obtain vanadium trioxide, sodium carbonate and ammonia-containing gas.

[0020] According to one embodiment of the present invention, the sodium roasting method for vanadium extraction further includes: returning the sodium carbonate obtained in step C to the sodium roasting process for mixing with vanadium-containing raw materials for sodium roasting; returning the ammonia-containing gas obtained in step C to the vanadium extraction and sodium removal process for use as an ammonia-containing substance; and returning the supernatant and wash water generated in the vanadium extraction and sodium removal process in step C to the leaching process for leaching the sodium roasted clinker.

[0021] By adopting the above technical solution, the present invention has at least one of the following beneficial effects:

[0022] The method for extracting vanadium and removing sodium from sodium vanadium solution provided by the present invention uses sodium vanadium solution as raw material. The vanadium concentration is increased by adding a vanadium enhancer to the sodium vanadium solution. By adjusting the pH value and adding an ammonia-containing substance, vanadium and sodium in the sodium vanadium solution are simultaneously extracted and removed in the form of sodium ammonium vanadate. Furthermore, by introducing a carbonaceous reducing gas into the sodium ammonium vanadate, vanadium trioxide, sodium carbonate, and an ammonia-containing gas are obtained through reduction and separation, thus achieving effective separation and recovery of vanadium and sodium.

[0023] In the method for vanadium extraction and sodium removal from sodium vanadate solution provided by the present invention, the ammonia-containing gas obtained by the reduction and separation of carbonaceous reducing gas by introducing carbonaceous reducing gas into sodium ammonium vanadate can be returned as an ammonia-containing substance for vanadium extraction and sodium removal from sodium vanadate solution, thereby realizing the recycling of ammonia in the entire process.

[0024] In the sodium roasting vanadium extraction method provided by this invention, vanadium is extracted and sodium is removed simultaneously using the sodium vanadium slurry extraction and sodium removal method provided by this invention, resulting in high-purity vanadium trioxide. The obtained sodium carbonate can be returned for use in the sodium roasting process, and the obtained ammonia-containing gas can be returned to the vanadium extraction and sodium removal process as an ammonia-containing substance. The supernatant and washing water generated during the vanadium extraction and sodium removal process can be returned to the leaching process to leach the sodium roasted clinker, forming a recycling of sodium, ammonia, and wastewater in the entire process. As a result, the method of this invention has no significant emissions of waste gas, waste liquid, or waste residue, meets green environmental protection requirements, and is suitable for industrial-scale production. Attached Figure Description

[0025] Figure 1 A flowchart of the method for vanadium extraction and simultaneous sodium removal from sodium vanadium solution provided by the present invention;

[0026] Figure 2 A process flow diagram of a method for vanadium extraction and simultaneous sodium removal from sodium vanadium solution provided in an embodiment of the present invention;

[0027] Figure 3 The flowchart is provided by the present invention for the sodium roasting method for vanadium extraction;

[0028] Figure 4 This is a process flow diagram of a sodium roasting method for vanadium extraction provided in an embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] Specific embodiments of the invention are disclosed herein as needed; however, it should be understood that the embodiments disclosed herein are merely examples of the invention that may be implemented in various alternative forms. In the following description, various operating parameters and components are described in several contemplated embodiments. These specific parameters and components are provided as examples only and are not intended to be limiting.

[0031] According to a first aspect of the present invention, a method for extracting vanadium from sodium vanadium solution while simultaneously removing sodium is provided.

[0032] like Figure 1 and 2 As shown, the method includes the following steps:

[0033] a: Add vanadium enhancer to sodium vanadium solution to adjust sodium vanadium ratio, add acid to adjust pH value, and then add ammonia to adjust ammonium vanadium ratio and pH value. After precipitation and solid-liquid separation, sodium ammonium vanadate precipitate and supernatant are obtained.

[0034] b: A carbonaceous reducing gas is introduced into the sodium ammonium vanadate precipitate, and vanadium trioxide, sodium carbonate, and ammonia-containing gas are obtained by reduction and separation.

[0035] In this invention, sodium vanadium solution is used as raw material. The vanadium concentration is increased by adding a vanadium enhancer to the sodium vanadium solution. By adjusting the pH value and adding an ammonia-containing substance, vanadium and sodium in the sodium vanadium solution are simultaneously extracted and removed in the form of sodium ammonium vanadate. Furthermore, by introducing a carbonaceous reducing gas into the sodium ammonium vanadate, vanadium trioxide, sodium carbonate, and ammonia-containing gas are obtained through reduction separation, thus achieving effective separation and extraction of vanadium and sodium.

[0036] The vanadium sodium solution used in this invention can be the leachate obtained from the leaching of vanadium clinker in the vanadium sodium roasting process. In some embodiments, the vanadium sodium solution used in this invention has a vanadium concentration of 25–80 g / L and a sodium concentration of 25–80 g / L (sodium content is less than or equal to vanadium concentration), and the content of other impurities is not limited. It should be understood that the solution of this invention is not limited to this specific concentration of vanadium and sodium, and can also be applied to other concentrations. In some embodiments, the vanadium sodium solution used in this invention has a pH value of 10–13, a sodium-vanadium ratio of 1–3:1 (molar ratio), and a solution temperature of 40–90°C. It should be understood that the solution of this invention is not limited to these specific conditions.

[0037] In this invention, a vanadium enrichment agent is added to the vanadium sodium solution to increase the vanadium concentration, thereby making the sodium-vanadium ratio in the vanadium sodium solution close to the sodium-vanadium ratio required for the precipitation of sodium ammonium vanadate (SAV, Na(NH4)(VO3)2). Normally, the initial sodium-vanadium ratio in the vanadium sodium solution is greater than 0.5. To facilitate subsequent precipitation of sodium ammonium vanadate, a vanadium enrichment agent is added to adjust the sodium-vanadium ratio to be close to 0.5. Preferably, the vanadium enrichment agent is added to adjust the sodium-vanadium molar ratio to 0.4-0.7:1. Typically, but not limited to, the vanadium enrichment agent can be added to adjust the sodium-vanadium molar ratio to 0.4:1, 0.5:1, 0.6:1, or 0.7:1. Preferably, the vanadium enrichment agent can be at least one of ammonium polyvanadate (APV), red cake, and vanadium pentoxide. Generally, the addition of a vanadium enrichment agent will cause a change in the pH value of the vanadium sodium solution, typically resulting in a decrease in pH. In some embodiments, after the addition of the vanadium enrichment agent, the pH value of the vanadium sodium solution is 8.5-12.5.

[0038] In this invention, acid is added to the sodium vanadium solution to adjust the initial pH value of the precipitated sodium ammonium vanadate. Preferably, the acid is added to adjust the pH value to 1.5–5. Typically, but not limited to, acid can be added to adjust the pH value to 1.5, 2, 2.5, 3, 3.5, 4, 4.5, or 5. Preferably, the acid used can be sulfuric acid, for example, 1:1 sulfuric acid. The advantages of using sulfuric acid are: on the one hand, it can save costs; on the other hand, it can avoid the introduction of new impurities, and sulfuric acid is relatively stable.

[0039] In this invention, adding an ammonia-containing substance to the vanadium sodium solution to adjust the ammonium-vanadium ratio and pH value is for the purpose of precipitating sodium ammonium vanadate. Preferably, the ammonia-containing substance is added to adjust the ammonium-vanadium molar ratio to 1.5–3.5 and the pH value to 9–13. Typically, but not limited to, the ammonia-containing substance can be added to adjust the ammonium-vanadium molar ratio to 1.5, 2, 2.5, 3, or 3.5 and the pH value to 9, 10, 11, 12, or 13. Preferably, the ammonia-containing substance is at least one of ammonia gas or ammonia water.

[0040] In some embodiments, in step a, the temperature of the sodium vanadate solution is adjusted to 10–60°C before adding acid to adjust the pH value, and the temperature is maintained at 10–60°C when adding the ammonia-containing substance. Temperatures that are too high or too low will affect the quality of the sodium ammonium vanadate. Too high a temperature will cause the sodium ammonium vanadate to dissolve, increasing vanadium loss; too low a temperature will increase refrigeration costs and also affect the quality of the sodium ammonium vanadate.

[0041] In some embodiments, in step a, the precipitation time is 30 to 90 minutes.

[0042] In some embodiments, step a further includes washing the sodium ammonium vanadate precipitate obtained from solid-liquid separation to remove impurities and ensure the purity of the final product. Preferably, the washing water temperature is 10–35°C, the washing water pH is 4–8, and the washing water volume added is equal to the volume of the sodium vanadate solution. This ensures water circulation and avoids an increase in water volume. The washing water can be production water, such as tap water. The reason for controlling the washing water temperature is that sodium ammonium vanadate is soluble in hot water and acid, and too high a washing water temperature will cause sodium ammonium vanadate to dissolve. Therefore, the washing water temperature is controlled below the temperature at which sodium ammonium vanadate dissolves. Controlling the washing water pH is to remove impurities while preventing sodium ammonium vanadate from dissolving. Controlling the washing water volume is to ensure the recycling of process water, eliminating the need to introduce new water or treat excess production wastewater. Typical but not limited wash water temperatures can be 10°C, 15°C, 20°C, 25°C, 30°C, or 35°C; typical but not limited wash water pH values ​​can be 4, 5, 6, 7, or 8; and typical but not limited wash water addition amounts (i.e., addition volumes) can be 1, 1.5, or 2 times the volume of vanadium sodium chloride solution.

[0043] In step b, the introduction of a carbonaceous reducing gas into the sodium ammonium vanadate precipitate aims to separate vanadium and sodium. Preferably, the carbonaceous reducing gas includes carbon monoxide. In some embodiments, the main component of the carbonaceous reducing gas is CO, accounting for ≥40%. Preferably, the amount of carbonaceous reducing gas used is 1.5 to 5 based on the molar ratio of carbon monoxide in the carbonaceous reducing gas to vanadium in the sodium ammonium vanadate precipitate, and the reaction temperature is 550 to 700°C. Typically, but not limitingly, the amount of carbonaceous reducing gas used can be 1.5, 2, 2.5, 3, 3.5, 4, 4.5, or 5, and the typical, but not limiting, reaction temperature can be 550°C, 600°C, 650°C, or 700°C.

[0044] Preferably, the ammonia-containing gas obtained in step b is returned as an ammonia-containing substance to the sodium vanadium solution for vanadium extraction and sodium removal, which helps to achieve the recycling of ammonia in the entire process.

[0045] According to a second aspect of the present invention, a method for sodium roasting to extract vanadium is provided. For example... Figure 3 and 4 As shown, the sodium roasting method for vanadium extraction includes the following steps:

[0046] A. Sodium roasting process: Sodium roasting is performed on vanadium-containing raw materials to obtain sodium roasted clinker;

[0047] B. Leaching process: Leach the sodium-treated roasted clinker obtained in step A to obtain sodium-treated vanadium solution;

[0048] C. Vanadium Extraction and Sodium Removal Process: The sodium vanadium solution obtained in step B is subjected to vanadium extraction and sodium removal using the method described in the first aspect of the present invention, to obtain vanadium trioxide, sodium carbonate and ammonia-containing gas.

[0049] The sodium roasting method for vanadium extraction provided by this invention involves simultaneously extracting vanadium and removing sodium from the sodium vanadium solution using the method provided by this invention, thereby obtaining a high-purity vanadium trioxide product. The sodium roasting method for vanadium extraction provided by this invention has the advantages described in the method for simultaneous extraction and removal of vanadium from the sodium vanadium solution according to the first aspect of this invention, which will not be elaborated further here.

[0050] In some embodiments, the sodium roasting method for vanadium extraction further includes: returning the sodium carbonate obtained in step C to the sodium roasting process for mixing with vanadium-containing raw materials for sodium roasting, thereby realizing the recycling of sodium in the entire process.

[0051] In some embodiments, the sodium roasting method for vanadium extraction further includes: returning the ammonia-containing gas obtained in step C to the vanadium extraction and sodium removal process for use as an ammonia-containing product, thereby realizing the recycling of ammonia in the entire process.

[0052] In some embodiments, the sodium roasting method for vanadium extraction further includes: the wash water generated from washing the sodium ammonium vanadate precipitate can be combined with the supernatant of the vanadium precipitation and returned to the leaching process for leaching the sodium roasting clinker, thereby realizing the recycling of wastewater in the entire process.

[0053] The present invention will now be described in detail through specific embodiments.

[0054] Example 1

[0055] Add APV to 100 mL of vanadium sodium solution (V ~25 g / L, Na ~25 g / L, pH -10) to adjust the sodium-vanadium ratio to 0.4 and the solution pH to 8.5. After cooling the vanadium solution to 10℃, add 1:1 sulfuric acid to adjust the pH to 3. At 10℃, introduce ammonia gas to adjust the ammonium-vanadium ratio to 1.5 and adjust the pH to 9. After precipitation for 30 min, sodium ammonium vanadate is generated. Solid-liquid separation is performed, and the solid sodium ammonium vanadate is washed once with 100 mL of tap water. The washing water and vanadium precipitation wastewater are returned to the leaching process. Carbonaceous reducing gas is introduced into the precipitate SAV at a ratio of CO / V = 1.5 (molar ratio). After reduction and separation at 550℃, vanadium trioxide, sodium carbonate, and ammonia gas are generated. The sodium carbonate is used in the roasting stage to be mixed with vanadium slag for roasting, and the ammonia gas can be used in the vanadium precipitation stage, forming a recycling of sodium, ammonia, and wastewater in the entire process. The main components and contents of vanadium trioxide are as follows: TV ~ 65.3%; C ~ 0.02%; S ~ 0.01%; Si ~ 0.09%; Fe ~ 0.01%; P ~ 0.01%; Na2O + K2O ~ 0.71%.

[0056] Example 2

[0057] Add APV to 200 mL of vanadium sodium solution (V ~ 50 g / L, Na ~ 45 g / L, pH - 10) to adjust the sodium-vanadium ratio to 0.5 and the solution pH to 10.5. After cooling the vanadium solution to 40℃, add sulfuric acid at a 1:1 ratio to adjust the pH to 4. At 40℃, introduce ammonia gas to adjust the ammonium-vanadium ratio to 2 and adjust the pH to 11. After precipitation for 60 min, sodium ammonium vanadate is generated. Solid-liquid separation is performed, and the solid sodium ammonium vanadate is washed once with 200 mL of tap water. The washing water and vanadium precipitation wastewater are returned to the leaching process. Carbonaceous reducing gas is introduced into the precipitate SAV at a ratio of CO / V = 3.5 (molar ratio). After reduction and separation at 650℃, vanadium trioxide, sodium carbonate, and ammonia gas are generated. The sodium carbonate is used in the roasting stage to be mixed with vanadium slag for roasting, and the ammonia gas can be used in the vanadium precipitation stage, forming a recycling of sodium, ammonia, and wastewater in the entire process. The main components and contents of vanadium trioxide are as follows: TV ~ 65.2%; C ~ 0.01%; S ~ 0.01%; Si ~ 0.09%; Fe ~ 0.01%; P ~ 0.01%; Na2O + K2O ~ 0.64%.

[0058] Example 3

[0059] Add APV to 300 mL of vanadium sodium solution (V ~80 g / L, Na ~70 g / L, pH -10) to adjust the sodium-vanadium ratio to 0.7 and the solution pH to 12.5. After cooling the vanadium solution to 60℃, add 1:1 sulfuric acid to adjust the pH to 6. At 60℃, introduce ammonia gas to adjust the ammonium-vanadium ratio to 1.5 and adjust the pH to 13. Precipitate for 30 min to generate sodium ammonium vanadate. Separate the solid and liquid phases. Wash the solid sodium ammonium vanadate once with 300 mL of tap water. The wash water and vanadium precipitation wastewater are returned to the leaching process. Introduce carbonaceous reducing gas (SAV) into the precipitate product (CO / V = 5). After reduction and separation at 700℃, vanadium trioxide, sodium carbonate, and ammonia gas are generated. The sodium carbonate is used in the roasting stage to be mixed with vanadium slag for roasting. The ammonia gas can be used in the vanadium precipitation stage, forming a recycling of sodium, ammonia, and wastewater throughout the process. The main components and contents of vanadium trioxide are as follows: TV ~ 65%; C ~ 0.04%; S ~ 0.02%; Si ~ 0.09%; Fe ~ 0.01%; P ~ 0.01%; Na2O + K2O ~ 0.74%.

Claims

1. A method for extracting vanadium from sodium vanadium solution while simultaneously removing sodium, characterized in that, Includes the following steps: a: Add a vanadium enhancer to the sodium vanadium solution to adjust the sodium-vanadium molar ratio to 0.4-0.7:1, add acid to adjust the pH to 1.5-5, then add an ammonia-containing substance to adjust the ammonium-vanadium molar ratio to 1.5-3.5 and adjust the pH to 9-13. After precipitation and solid-liquid separation, sodium ammonium vanadate precipitate and supernatant are obtained. The vanadium enhancer is at least one of ammonium polyvanadate and vanadium pentoxide, and the ammonia-containing substance is at least one of ammonia gas and ammonia water. b: A carbonaceous reducing gas is introduced into the sodium ammonium vanadate precipitate, and vanadium trioxide, sodium carbonate, and ammonia-containing gas are obtained by reduction and separation. The carbonaceous reducing gas includes carbon monoxide.

2. The method for extracting vanadium from sodium vanadium solution and simultaneously removing sodium according to claim 1, characterized in that, In step a, the acid is sulfuric acid.

3. The method for extracting vanadium from sodium vanadium solution and simultaneously removing sodium according to claim 1, characterized in that, In step a, the temperature of the vanadium sodium solution is 40~90℃. Before adding acid to adjust the pH value, the temperature is adjusted to 10~60℃. When adding ammonia, the temperature is maintained at 10~60℃.

4. The method for extracting vanadium from sodium vanadium solution and simultaneously removing sodium according to claim 1, characterized in that, In step a, the precipitation time is 30~90 min.

5. The method for extracting vanadium from sodium vanadium solution and simultaneously removing sodium according to claim 1, characterized in that, In step b, the amount of carbonaceous reducing gas used is 1.5 to 5 based on the molar ratio of carbon monoxide in the carbonaceous reducing gas to vanadium in the sodium ammonium vanadate precipitate, and the reaction temperature is 550 to 700°C.

6. The method for extracting vanadium from sodium vanadium solution and simultaneously removing sodium according to claim 1, characterized in that, Step a further includes: washing the sodium ammonium vanadate precipitate obtained from solid-liquid separation, with the washing water having a pH of 4-8 and a temperature of 10-35℃, and the amount of washing water added being equal to the volume of the sodium vanadium solution.

7. The method for extracting vanadium from sodium vanadium solution and simultaneously removing sodium according to claim 1, characterized in that, The ammonia-containing gas obtained in step b is returned as an ammonia-containing substance to the sodium vanadium solution for vanadium extraction and sodium removal.

8. A method for sodium roasting to extract vanadium, characterized in that, Includes the following steps: A: Sodium roasting process: Sodium roasting is performed on vanadium-containing raw materials to obtain sodium roasted clinker; B: Leaching process: Leach the sodium-treated roasted clinker obtained in step A to obtain sodium-treated vanadium solution; C: Vanadium extraction and sodium removal process: The sodium vanadium solution obtained in step B is subjected to vanadium extraction and sodium removal using the method described in any one of claims 1 to 7, to obtain vanadium trioxide, sodium carbonate and ammonia-containing gas.

9. The vanadium extraction method by sodium roasting according to claim 8, characterized in that, Also includes: The sodium carbonate obtained in step C is returned to the sodium roasting process for mixing with vanadium-containing raw materials for sodium roasting. The ammonia-containing gas obtained in step C is returned to the vanadium extraction and sodium removal process for use as an ammonia-containing substance. The supernatant and wash water generated in the vanadium extraction and sodium removal process in step C are returned to the leaching process for leaching the sodium roasted clinker.

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