Method for preparing vanadium electrolyte from vanadium-containing refined tailings

Abstract

The method comprises the following steps that S1, water is added into the vanadium-containing refined tailings for pulping, and an alkaline substance is added to adjust the pH value; s2, stirring, adding an oxidizing agent, carrying out a reaction, and carrying out solid-liquid separation to obtain vanadium-containing leachate and leaching residues; s3, extracting the vanadium-containing leachate to obtain raffinate and a loaded organic phase; and S4, an acid solution is added to carry out reverse extraction on the loaded organic phase, a 3.5-valent vanadium solution and a lean organic phase are obtained, the lean organic phase is returned for cyclic extraction, oil is removed from the 3.5-valent vanadium solution, and the 3.5-valent vanadium electrolyte is obtained. According to the method, the problems of efficient extraction of vanadium and separation of titanium are solved by regulating and controlling the pH value and the oxidation-reduction potential, the 3.5-valent vanadium leaching solution is directly obtained, deep purification and enrichment are achieved through extraction and reverse extraction, the high-concentration 3.5-valent vanadium electrolyte can be prepared, and the method has the beneficial effects of being short in technological process, low in agent consumption and high in efficiency. And the product vanadium is controllable in concentration and low in impurity and can be directly used as a vanadium electrolyte raw material.

Description

Technical Field

[0001] This invention relates to the field of vanadium metallurgy technology, and in particular to a method for preparing vanadium electrolyte from vanadium-containing refined tailings. Background Technology

[0002] Vanadium-containing refined tailings are solid tailings obtained from crude titanium tetrachloride liquid after impurity removal. During the impurity removal process, vanadium is reduced to trivalent chlorides or chloride oxides by reducing agents such as fatty acids, aluminum powder, and copper wire, thus separating it from the titanium tetrachloride liquid. Therefore, the refined tailings contain a large amount of vanadium, titanium, and chlorine, while small amounts of iron, calcium, and aluminum chloride impurities are also separated. Currently, the annual output of vanadium-containing refined tailings in the Panzhihua-Xichang region of China has reached 4,000 tons, and this is gradually increasing with the rise in the production of titanium dioxide and sponge titanium. However, on the one hand, because the vanadium and titanium in it are mostly in the form of chlorides and chloride oxides, they are easily decomposed and volatilized to produce chlorine and hydrogen chloride gas, causing environmental pollution. On the other hand, the separation of vanadium and titanium is relatively difficult, making their direct utilization challenging. The current treatment method involves high-temperature roasting and dechlorination to convert vanadium and titanium into stable vanadium pentoxide and titanium dioxide, which are then added to ordinary vanadium slag for vanadium extraction. This process is complex and energy-intensive, and the treatment cost of chlorine-containing waste gas is also high.

[0003] The existing process routes for vanadium extraction by sodium roasting of refined tailings and vanadium extraction by inert gas roasting pretreatment-leaching have solved the problem of vanadium-titanium-chlorine separation, but still require a high-temperature roasting process, and the generation of flue gas is difficult to eliminate.

[0004] Chinese patent CN114350953A discloses a method for pre-oxidation and vanadium extraction from vanadium-containing refined tailings. The method involves mixing vanadium-containing refined tailings, vanadium pentoxide, and vanadium trioxide in an oxygen atmosphere for pre-oxidation roasting. The tail gas generated during roasting is absorbed by passing it through an alkaline solution. Finally, the roasted material is added to the alkaline solution for leaching to achieve vanadium extraction and separation.

[0005] Chinese patent CN112981141A discloses a method for preparing ferrovanadium alloy from titanium tetrachloride refined tailings. The method involves oxidizing and roasting the titanium tetrachloride refined tailings in a rotary kiln to remove chlorine and carbon elements, and then mixing the roasted material with iron particles, reducing agents, etc. to smelt and obtain ferrovanadium alloy. This method also involves a high-temperature roasting process, which cannot avoid the generation of a large amount of chlorine-containing tail gas.

[0006] Chinese patent CN110683579B discloses a method for producing high-purity vanadium pentoxide from titanium tetrachloride refining vanadium-removing tailings. First, the titanium tetrachloride refining vanadium-removing tailings are subjected to oxidative dechlorination pretreatment to obtain oxidized slag and chlorine gas. The oxidized slag is then chlorinated again to prepare vanadium oxychloride. The final product, vanadium pentoxide, has a low impurity content, but it still cannot eliminate chlorine-containing tail gas.

[0007] Chinese patent CN110423893A discloses a method for preparing vanadium oxysulfate from titanium tetrachloride refining tailings. The method involves calcining the titanium tetrachloride refining tailings with aerobic conditions, then leaching with sulfuric acid, followed by the introduction of SO2 gas for reaction, and finally concentrating and crystallizing to obtain vanadium oxysulfate crystals.

[0008] Chinese patent CN108996547B discloses a method for ultrasonic-assisted alkaline leaching of vanadium from titanium tetrachloride refined tailings. The method involves mixing titanium tetrachloride refined tailings with alkaline solution and then introducing oxygen for leaching. A vanadium-containing leachate is obtained, which is then cooled to crystallize sodium vanadate crystals. This method requires a large amount of alkaline solution and is therefore not economically viable.

[0009] As can be seen from the current patents related to vanadium-containing refined tailings, since vanadium and impurities such as titanium, iron and aluminum mainly exist in the form of chlorides or chlorine oxides, which have good water solubility and acid solubility, it is very difficult to separate vanadium from impurities. Therefore, high-temperature roasting oxidation is generally used to convert vanadium into oxides before separation. This process inevitably generates chlorine-containing flue gas and loses the effective utilization of low-priced vanadium. At the same time, the energy consumption of high-temperature roasting and the material consumption of tail gas treatment are both high, which increases the production cost.

[0010] Therefore, it is necessary to develop a fully wet vanadium extraction technology for refined tailings, thereby promoting the efficient and high-value resource utilization of refined tailings, realizing the effective utilization of low-priced vanadium in refined tailings, and achieving efficient separation and extraction of vanadium from impurities such as titanium and iron in this process, thus avoiding the generation of harmful chlorine-containing flue gas. Summary of the Invention

[0011] The main objective of this invention is to provide a method for preparing vanadium electrolyte from vanadium-containing refined tailings. By directly leaching titanium tetrachloride refined tailings and adjusting the pH and redox potential, the problem of vanadium-titanium separation during the leaching process is solved. Then, vanadium electrolyte with 3.5 valence can be prepared by extraction with sulfuric acid back-extraction. This method has the advantages of short process flow, low reagent consumption, controllable vanadium concentration in the product, and low impurities, making it suitable as a raw material for vanadium electrolyte.

[0012] According to one aspect of the present invention, a method for preparing vanadium electrolyte from vanadium-containing refined tailings is provided, comprising the following steps: S1: Take vanadium-containing refined tailings, add water for pulping, and then add alkaline substances to adjust the pH value of the pulp. S2: While maintaining stirring, slowly add oxidant to the slurry until the ratio of trivalent vanadium to tetravalent vanadium in the system reaches (0.8~1.2):(0.8~1.2); continue stirring and reacting, and after the reaction is completed, perform solid-liquid separation of the system to obtain vanadium-containing leachate and leachate residue; S3: Extract the vanadium-containing leachate to obtain raffinate and supported organic phase; S4: Add an acidic solution to back-extract the supported organic phase to obtain a vanadium 3,5-valent solution and a lean organic phase. Return the lean organic phase to step S3 for recycling and extraction. Remove the oil from the vanadium 3,5-valent solution to obtain a vanadium 3,5-valent electrolyte.

[0013] According to one embodiment of the present invention, the vanadium-containing refined tailings contains 10-30% vanadium and 10-50% chlorine by weight percentage.

[0014] According to one embodiment of the present invention, the oxidant includes one or more of hydrogen peroxide, chlorine dioxide, and hypochlorous acid.

[0015] According to one embodiment of the present invention, when the target ferrovanadium is a high-quality ferrovanadium other than medium-grade ferrovanadium, the extraction is performed using an organic acid extractant.

[0016] According to one embodiment of the present invention, the organic acid extractant includes one or more of P204, P507 and Cyanex272.

[0017] According to one embodiment of the present invention, the organic acid extractant is used after being diluted with sulfonated kerosene.

[0018] According to one embodiment of the present invention, the acidic solution includes a dilute sulfuric acid solution.

[0019] According to one embodiment of the present invention, the concentration of the dilute sulfuric acid solution is 10~30 vol.

[0020] According to one embodiment of the present invention, in step S1, the pH value of the slurry is in the range of 1.5 to 2.0.

[0021] According to one embodiment of the present invention, the alkaline substance includes sodium hydroxide.

[0022] According to an embodiment of the present invention, a method for preparing vanadium electrolyte from vanadium-containing refined tailings is proposed. By directly leaching the titanium tetrachloride refined tailings and adjusting the pH and redox potential, the problem of vanadium-titanium separation during the leaching process of the refined tailings is solved. Then, vanadium electrolyte with 3.5 valence can be prepared by extraction with sulfuric acid back-extraction. This method has the advantages of short process flow, low reagent consumption, controllable vanadium concentration in the product, and low impurities, which can be directly used as raw material for vanadium electrolyte. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some implementation examples of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A process flow diagram of a method for preparing vanadium electrolyte from vanadium-containing refined tailings according to an exemplary embodiment of the present invention is shown. Detailed Implementation

[0025] The following detailed description of the embodiments is intended to exemplify the principles of the present invention, but should not be construed as limiting the scope of the invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0026] These embodiments are provided to make this disclosure thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0027] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0029] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0031] like Figure 1 As shown, the present invention provides a method for preparing vanadium electrolyte from vanadium-containing refined tailings, which includes the following steps: S1: Take vanadium-containing refined tailings, add water for pulping, and then add alkaline substances to adjust the pH value of the pulp. S2: While maintaining stirring, slowly add oxidant to the slurry until the ratio of trivalent vanadium to tetravalent vanadium in the system reaches (0.8~1.2):(0.8~1.2); continue stirring and reacting, and after the reaction is completed, perform solid-liquid separation of the system to obtain vanadium-containing leachate and leachate residue; S3: Extract the vanadium-containing leachate to obtain raffinate and supported organic phase; S4: Add an acidic solution to back-extract the supported organic phase to obtain a vanadium 3,5-valent solution and a lean organic phase. Return the lean organic phase to step S3 for recycling and extraction. Remove the oil from the vanadium 3,5-valent solution to obtain a vanadium 3,5-valent electrolyte.

[0032] In the method for preparing vanadium electrolyte from vanadium-containing refined tailings according to an embodiment of the present invention, the problem of vanadium-titanium separation in the leaching process of refined tailings is solved by directly leaching titanium tetrachloride refined tailings and by adjusting pH and redox potential. Then, 3.5 valent vanadium electrolyte can be prepared by extraction with sulfuric acid back-extraction. It has the advantages of short process flow, low reagent consumption, controllable vanadium concentration in the product and low impurities, and can be directly used as raw material for vanadium electrolyte.

[0033] Specifically, in step S2, the stirring reaction time is 1 to 6 hours.

[0034] In step S2, an oxidant is slowly added to the slurry until the ratio of trivalent vanadium to tetravalent vanadium in the system reaches 1:1.

[0035] After implementation of this application, the vanadium leaching rate can reach over 90%, the vanadium concentration of the 3.5 vanadium solution obtained by back-extraction can reach 100 g / L, and the main impurity ions Al, Ca, Fe, Si, Cr, and Ti can all be reduced to below 20 ppm.

[0036] In some specific embodiments, the vanadium-containing refined tailings contain 10-30% vanadium and 10-50% chlorine by weight percentage.

[0037] Based on the above embodiments, the oxidant includes one or more of hydrogen peroxide, chlorine dioxide, and hypochlorous acid.

[0038] Hydrogen peroxide can undergo a Fenton-like reaction with transition metal elements in vanadium-containing leaching solutions, efficiently oxidizing low-valence vanadium to high-valence vanadium, significantly enhancing the leaching effect. Furthermore, its reaction product is water, which is clean and pollution-free. Chlorine dioxide has strong oxidizing properties, rapidly and thoroughly oxidizing vanadium in tailings, effectively improving the vanadium conversion rate, while having low corrosiveness to equipment, reducing equipment maintenance costs. Hypochlorous acid can exert its oxidizing effect under mild conditions, promoting the full conversion of vanadium, and the substances produced by its decomposition after participating in the reaction have minimal interference with subsequent preparation processes.

[0039] In some specific embodiments, the extraction uses an organic acid extractant.

[0040] Based on the above embodiments, the organic acid extractant includes one or more of P204, P507 and Cyanex272.

[0041] P204 exhibits strong selectivity for low-valent vanadium, efficiently separating vanadium from impurities such as iron and aluminum in tailings leachate, and boasts a large extraction capacity, making it suitable for the vanadium content characteristics in tailings. P507 achieves deep vanadium extraction even at low to medium acidity, reducing acid consumption while minimizing co-extraction of other metal ions during the extraction process, thus improving vanadium purity. Cyanex272 demonstrates excellent selectivity for high-valent vanadium, particularly in complex systems where it can precisely capture vanadium, and exhibits good back-extraction performance, enabling efficient recovery of vanadium from the organic phase for subsequent electrolyte preparation.

[0042] In some specific embodiments, the organic acidic extractant is diluted with sulfonated kerosene before use. Sulfonated kerosene is chemically stable and, as a diluent, can effectively adjust the concentration of the extractant, avoiding problems such as slow phase separation and low mass transfer efficiency caused by the high viscosity of the pure extractant. This significantly improves the fluidity and dispersibility of the extraction system and accelerates the reaction rate between vanadium ions and the extractant.

[0043] Based on the above embodiments, the acidic solution includes a dilute sulfuric acid solution. Dilute sulfuric acid can adjust the acidity of the system, destroy the complex structure between the organic phase extractant and vanadium ions, promote the efficient desorption of vanadium ions into the aqueous phase, achieve a high vanadium recovery rate, and ensure that the vanadium concentration in the aqueous phase after back-extraction is suitable, which can directly provide qualified raw materials for subsequent electrolyte preparation. Furthermore, dilute sulfuric acid is mild and causes little damage to the organic phase.

[0044] In some specific embodiments, the concentration of the dilute sulfuric acid solution is 10-30 vol%. This concentration range ensures sufficient acidity to disrupt the complexation structure between the extractant and vanadium ions, while also preventing excessive acidity from causing degradation of the organic phase.

[0045] Based on the above embodiments, in step S1, the pH value of the slurry is in the range of 1.5~2.0, thereby suppressing Fe in the vanadium-containing refining tailings. 3+ Al 3+Impurity ions are hydrolyzed to form hydroxide precipitates, which prevents them from mixing with vanadium and affecting subsequent purification. At the same time, it can promote the stable existence of vanadium in the tailings in the form of soluble vanadium oxide ions, thereby improving the leaching efficiency and dissolution amount of vanadium.

[0046] Based on the above embodiments, the alkaline substance includes sodium hydroxide. Sodium hydroxide has moderate and easily controllable alkalinity, which can accurately adjust the pH value of the slurry or solution to the target range, avoiding over-adjustment due to excessive alkalinity, reducing reagent waste and process time due to repeated adjustments, and sodium salt is easily soluble in water, so it will not introduce new impurity ions such as calcium and magnesium, avoiding interference with subsequent vanadium extraction, back-extraction and electrolyte purity.

[0047] The present application will be further described below through specific embodiments.

[0048] Example 1 S1: Vanadium-containing refined tailings are directly mixed with water and pulped, and sodium hydroxide is added to adjust the pH to 2.0; S2: While stirring, slowly add the oxidant to oxidize the low-valent vanadium to the ratio of trivalent vanadium to tetravalent vanadium of 1:1. Continue stirring and react for 6 hours, then separate the solid and liquid to obtain vanadium-containing leachate and leachate residue. S3: The vanadium-containing leachate was extracted using an extraction process to obtain raffinate and a supported organic phase; S4: The supported organic phase is back-extracted using dilute sulfuric acid to obtain a vanadium 3.5 solution and a lean organic phase. The lean organic phase is returned to the extraction process, and the vanadium 3.5 solution is de-oiled to obtain a vanadium 3.5 electrolyte.

[0049] In step S1, vanadium in the vanadium-containing refining tailings mainly exists in the form of trivalent chloride or chlorine oxide, with a vanadium content of 11% and a chlorine content of 22% by weight. In step S2, the oxidant is hydrogen peroxide; In step S3, the extraction process uses organic acidic extractant P507, which is diluted with sulfonated kerosene to a concentration of 30% before use. In step S1, the concentration of dilute sulfuric acid is 10 vol.

[0050] The vanadium leaching rate can reach 91%, and the vanadium concentration of the 3.5 valent vanadium solution obtained by back-extraction is 90 g / L. The main impurity ions Al, Ca, Fe, Si, Cr and Ti can all be reduced to below 20 ppm.

[0051] Example 2 S1: Vanadium-containing refined tailings are directly mixed with water and pulped, and sodium hydroxide is added to adjust the pH to 1.5; S2: While stirring, slowly add the oxidant to oxidize the low-valent vanadium to the ratio of trivalent vanadium to tetravalent vanadium of 1:1. Continue stirring and react for 1 hour, then separate the solid and liquid to obtain vanadium-containing leachate and leachate residue. S3: The vanadium-containing leachate was extracted using an extraction process to obtain raffinate and a supported organic phase; S4: The supported organic phase is back-extracted using dilute sulfuric acid to obtain a vanadium 3.5 solution and a lean organic phase. The lean organic phase is returned to the extraction process, and the vanadium 3.5 solution is de-oiled to obtain a vanadium 3.5 electrolyte.

[0052] In step S1, vanadium in the vanadium-containing refining tailings mainly exists in the form of trivalent chloride or chlorine oxide, with a vanadium content of 29% and a chlorine content of 48% by weight. In step S2, the oxidant is hypochlorous acid; In step S3, the extraction process uses organic acidic extractant P204, which is diluted with sulfonated kerosene to a concentration of 25% before use. In step S4, the concentration of dilute sulfuric acid is 30 vol.

[0053] The vanadium leaching rate can reach 93%, and the vanadium concentration of the 3.5 vanadium solution obtained by back-extraction can reach 128 g / L. The main impurity ions Al, Ca, Fe, Si, Cr and Ti can all be reduced to below 20 ppm.

[0054] Example 3 S1: Vanadium-containing refined tailings are directly mixed with water and pulped, and sodium hydroxide is added to adjust the pH to 1.8; S2: While stirring, slowly add the oxidant to oxidize the low-valent vanadium to the ratio of trivalent vanadium to tetravalent vanadium of 1:1. Continue stirring and react for 3 hours, then separate the solid and liquid to obtain vanadium-containing leachate and leachate residue. S3: The vanadium-containing leachate was extracted using an extraction process to obtain raffinate and a supported organic phase; S4: The supported organic phase is back-extracted using dilute sulfuric acid to obtain a vanadium 3.5 solution and a lean organic phase. The lean organic phase is returned to the extraction process, and the vanadium 3.5 solution is de-oiled to obtain a vanadium 3.5 electrolyte.

[0055] In step S1, vanadium in the vanadium-containing refining tailings mainly exists in the form of trivalent chloride or chlorine oxide, with a vanadium content of 15% and a chlorine content of 25% by weight. In step S2, the oxidant is chlorine dioxide; In step S3, the extraction process uses the organic acidic extractant Cyanex272, which is diluted with sulfonated kerosene to a concentration of 20% before use. In step S4, the concentration of dilute sulfuric acid is 15 vol.

[0056] The vanadium leaching rate can reach 92%, and the vanadium concentration of the 3.5 vanadium solution obtained by back-extraction can reach 103 g / L. The main impurity ions Al, Ca, Fe, Si, Cr and Ti can all be reduced to below 20 ppm.

[0057] The above are exemplary embodiments disclosed in this invention. The order of the disclosed embodiments is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this invention (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular.

[0058] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for preparing vanadium electrolyte from vanadium-containing refined tailings, characterized in that, Includes the following steps: S1: Take vanadium-containing refined tailings, add water for pulping, and then add alkaline substances to adjust the pH value of the pulp. S2: While maintaining stirring, slowly add oxidant to the slurry until the ratio of trivalent vanadium to tetravalent vanadium in the system reaches (0.8~1.2):(0.8~1.2); continue stirring and reacting, and after the reaction is completed, perform solid-liquid separation on the system to obtain vanadium-containing leachate and leachate residue; S3: Extract the vanadium-containing leachate to obtain raffinate and a supported organic phase; S4: Add an acidic solution to back-extract the supported organic phase to obtain a 3.5 vanadium solution and a lean organic phase. Return the lean organic phase to step S3 for recycling and extraction. De-oil the 3.5 vanadium solution to obtain a 3.5 vanadium electrolyte.

2. The method for preparing vanadium electrolyte from vanadium-containing refined tailings according to claim 1, characterized in that, The vanadium-containing refined tailings contain 10-30% vanadium and 10-50% chlorine by weight percentage.

3. The method for preparing vanadium electrolyte from vanadium-containing refined tailings according to claim 1, characterized in that, The oxidant includes one or more of hydrogen peroxide, chlorine dioxide, and hypochlorous acid.

4. The method for preparing vanadium electrolyte from vanadium-containing refined tailings according to claim 1, characterized in that, The extraction was performed using an organic acid extractant.

5. The method for preparing vanadium electrolyte from vanadium-containing refined tailings according to claim 4, characterized in that, The organic acid extractant includes one or more of P204, P507, and Cyanex272.

6. The method for preparing vanadium electrolyte from vanadium-containing refined tailings according to claim 4, characterized in that, The organic acid extractant is used after being diluted with sulfonated kerosene.

7. The method for preparing vanadium electrolyte from vanadium-containing refined tailings according to claim 1, characterized in that, The acidic solution includes a dilute sulfuric acid solution.

8. The method for preparing vanadium electrolyte from vanadium-containing refined tailings according to claim 7, characterized in that, The concentration of the dilute sulfuric acid solution is 10~30 vol.

9. The method for preparing vanadium electrolyte from vanadium-containing refined tailings according to claim 1, characterized in that, In step S1, the pH value of the slurry is in the range of 1.5 to 2.

0.

10. The method for preparing vanadium electrolyte from vanadium-containing refined tailings according to claim 1, characterized in that, The alkaline substance includes sodium hydroxide.

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