39 results about "Vanadyl sulfate" patented technology

The invention provides a method for preparing a nearly 3.5-valent vanadium electrolyte by reducing ammonium metavanadate with coke oven gas, which comprises the following steps: (1) reducing and calcining ammonium metavanadate in coke oven gas to obtain a reduced product; (2) carrying out replacement deamination on the reduced product in the step (1) to obtain a nearly 3.5-valent vanadium oxide, wherein the nearly 3.5-valent vanadium oxide contains V4O7; and (3) a mixed sulfuric acid solution and the approximately 3.5-valent vanadium oxide are subjected to a dissolution reaction, and the approximately 3.5-valent vanadium electrolyte is obtained. The process method disclosed by the invention is simple and easy to implement, the approximately 3.5 valence vanadyl sulfate electrolyte product with high vanadium concentration and low ammonia content can be obtained by taking the ammonium metavanadate and the coke oven gas as raw materials, and the application prospect is wide.

The invention provides a method for extracting vanadium by negative pressure roasting of dolomite and acid leaching of vanadium slag, and belongs to the technical field of resource recovery, the method comprises the following steps: crushing the vanadium slag, the dolomite and the vanadium slag to a certain particle size, mixing according to a certain proportion, and pelletizing; carrying out negative pressure roasting on the pellets by adopting a closed furnace to obtain roasted clinker and carbon dioxide; leaching and trapping the carbon dioxide through a calcium-containing aqueous solution to prepare light calcium carbonate; the roasted clinker is leached through sulfuric acid, and a vanadium-containing solution and leaching residues are obtained after leaching; extracting the vanadium-containing solution to prepare vanadyl sulfate; and carrying out magnetic separation on the leaching residues to obtain magnetite, and taking residual tailings as a cement raw material. According to negative pressure roasting, the normal pressure calcification roasting temperature is reduced, the cost is greatly saved, meanwhile, an iron component in the vanadium slag is converted into magnetic ferroferric oxide, the utilization rate of iron is increased, in addition, carbon dioxide enrichment is achieved through the closed furnace, a light calcium carbonate product is prepared through trapping and mineralization, and full-quantization high-value utilization of the vanadium slag component is achieved.

The application discloses a kind of bimetallic MOFs material of mesoporous structure and its efficient synthesis and screening method, with vanadyl sulfate and iron nitrate hydrate as two metal center ion source, with uniform benzene tricarboxylic acid as ligand material preparation formation mesoporous structure bimetallic MOFs material, 1,3,5-uniform benzene tricarboxylic acid is dissolved in mixed solvent one and obtained solution A, the mixed solvent one is 1:1 mixed solvent of ethanol and DMF;Metal salt one and metal salt two are dissolved in water, and a certain amount of ammonium fluoride is added, and gel B is formed;The metal salt one is Fe (NO3) 3·9H2O, and the metal salt two is VOSO4;Solution A is mixed with gel B and forms gel C after stirring for a certain time;Gel C is centrifuged and separated, then washed with ethanol, and then soaked in dichloromethane for multiple times;The obtained product is dried first, then activated, and powder D is obtained.The application can be synthesized at room temperature with bimetallic MOFs material with more optimal mesoporous structure, improve the yield, stability and excellent performance of material.

The application provides a method for preparing 3.5-valence vanadyl sulfate electrolyte by reducing ammonium polyvanadate with a gas, which comprises the following steps: (1) ammonium polyvanadate is reduced and calcined by a reducing gas to obtain vanadium oxide; the vanadium oxide contains V4O7; the reducing gas comprises a mixed gas of NH3, CO and H2; (2) a mixed sulfuric acid solution and the vanadium oxide are subjected to a dissolution reaction, and vanadium adjustment is performed to obtain 3.5-valence vanadyl sulfate electrolyte. The process is simple and easy to implement, 3.5-valence vanadyl sulfate electrolyte product can be obtained from ammonium polyvanadate as raw material, the vanadium concentration is high, and the application prospect is wide.

The invention provides a high-purity and high-solubility vanadyl sulfate crystal and a preparation method and application thereof.The preparation method of the high-purity and high-solubility vanadyl sulfate crystal comprises the following steps that ammonium metavanadate or ammonium polyvanadate serves as a raw material and is roasted at the temperature of 600-900 DEG C under the inert gas protection and reducing atmosphere conditions, and vanadium oxide is obtained; dissolving the vanadyl sulfate in a mixed solution of pure water and sulfuric acid to obtain a high-concentration vanadyl sulfate solution or vanadyl sulfate slurry; the valence state of vanadium is adjusted to 3.9-4.1; cooling, crystallizing and filtering to obtain primary vanadyl sulfate crystals; dissolving the primary vanadyl sulfate crystal in pure water to obtain a vanadyl sulfate solution, and filtering; and adding sulfuric acid, adjusting the vanadium valence state of the solution to 3.99-4.01, cooling, crystallizing, and filtering to obtain the high-purity and high-solubility vanadyl sulfate crystal. The vanadyl sulfate crystal has the advantages of small particle size, high purity, good solubility and the like, and has good application prospects and large-scale popularization potential in the field of vanadium electrolyte.

The invention discloses a converter vanadium slag gypsum negative pressure roasting circulation process, and relates to the technical field of non-ferrous metal solid waste diversified utilization, the method comprises the following steps: mixing raw materials according to a ratio, and carrying out negative pressure roasting to obtain calcified slag and sulfur dioxide, the raw materials comprising converter vanadium slag and industrial waste gypsum; industrial waste gypsum and converter vanadium slag are used as raw materials, roasting is performed under negative pressure, secondary countercurrent leaching is performed to obtain vanadium-containing acid leaching liquid, and the vanadium-containing acid leaching liquid is subjected to purification and impurity removal to directly prepare the vanadyl sulfate electrolyte. Wherein sulfur dioxide gas generated in the roasting process is directly used for preparing acid for acid leaching, leaching residues can be prepared into an adsorbent for pretreatment of vanadium-containing leaching liquid, multi-component cyclic utilization is achieved, and the cost is reduced.

The invention discloses a method for preparing high-purity vanadyl sulfate from acidic vanadium liquid. The method comprises the following steps: S1, extracting the acidic vanadium liquid by using an organic phase A to obtain a primary loaded organic phase; s2, washing the loaded organic phase once; s3, carrying out reverse extraction on the washed primary load organic phase by using alkali liquor to obtain primary reverse extraction liquor; s4, after the pH of the primary strip liquor is adjusted, a reducing agent is added for reduction, and a reduced solution is obtained; s5, extracting the reduced solution by using the organic phase B to obtain a secondary loaded organic phase and a secondary raffinate; s6, the secondary loaded organic phase is subjected to reverse extraction, and secondary reverse extraction liquid is obtained; and S7, the secondary strip liquor is subjected to oil removal treatment, and the vanadyl sulfate electrolyte is obtained. According to the method, the calcified acidic vanadium liquid produced on an industrial scale is adopted as a raw material for producing the vanadyl sulfate electrolyte, the raw material source is stable and easy to obtain, no ammonium salt is added in the whole process, no heating process is needed, two ion extraction agents are adopted for two-stage extraction, and the vanadium yield reaches 95% or above.

The application discloses a flexible transparent aqueous zinc ion battery polyaniline / vanadium oxide composite positive electrode sheet and a preparation method thereof, and belongs to the technical field of aqueous zinc ion batteries. The preparation method comprises the following steps: using vanadyl sulfate aqueous solution as an electroplating solution, using a gold grid / PET as a working electrode, and using a platinum sheet as a counter electrode to construct a two-electrode structure; a vanadium oxide layer is deposited on the surface of the gold grid / PET by adopting a constant-voltage electrochemical deposition method, and a vanadium oxide / gold grid / PET is prepared; sulfuric acid and polyaniline are added into deionized water to prepare an electroplating solution, the vanadium oxide / gold grid / PET is used as the working electrode, the platinum electrode is used as the counter electrode, and a saturated calomel electrode is used as a reference electrode to construct a three-electrode structure; a polyaniline layer is deposited on the surface of the vanadium oxide / gold grid / PET by adopting a constant-voltage electrochemical deposition method, and the composite positive electrode sheet is obtained.

The invention belongs to the technical field of high-value utilization of non-ferrous metal solid waste, and relates to a method for preparing high-purity vanadyl sulfate through calcification roasting countercurrent leaching extraction.The method comprises the steps that converter vanadium slag serves as a raw material, a calcification agent is added for roasting, and transformed vanadium slag is obtained; secondary countercurrent is conducted on the transformed vanadium slag, calcium sulfite is added in the leaching process, and reduced vanadium-containing acid leaching liquid is obtained; the leaching residues can be used for preparing ferrotitanium alloy products; vanadium and impurities are separated through the extraction circulation process of extraction, washing and reverse extraction, and the high-purity vanadyl sulfate electrolyte is prepared. According to the method, the converter vanadium slag is adopted as a raw material, and high-value utilization of the converter vanadium slag in the field of energy storage is achieved. And meanwhile, resource utilization of leaching residues obtained through secondary countercurrent leaching is achieved, and whole-process harmless treatment is achieved.

This invention provides a method for preparing VOSO4 electrolyte by gas-enhanced reduction back-extraction, comprising the following steps: adding an extraction inhibitor to an acidic vanadium-containing solution and stirring to obtain a vanadium-containing solution, wherein the extraction inhibitor is phosphoric acid and / or a phosphoric acid compound; adjusting the pH of the solution to 0.5–3.0 with sulfuric acid, mixing with an organic phase for extraction, and separating the extract to obtain a vanadium-loaded organic phase; washing the vanadium-loaded organic phase with dilute sulfuric acid; mixing a back-extraction agent with the vanadium-loaded organic phase for back-extraction, while simultaneously introducing gas to enhance the back-extraction process, to obtain an empty organic phase and a vanadium electrolyte; adjusting the vanadium back-extraction solution through electrolysis in a fuel cell stack to obtain a vanadium electrolyte with a valence state conforming to the standard. This invention provides a novel gas-enhanced reduction process for directly preparing vanadium oxysulfate electrolyte, which has the advantages of simple process, easy operation, low cost, and environmental friendliness.

The application belongs to the technical field of electrochemical energy storage and provides an electrolyte, a preparation method and a full vanadium redox flow battery. The electrolyte comprises an acidic electrolyte, vanadyl sulfate, an additive and water, the additive is 5-amino-2-naphthalenesulfonic acid, 3-aminobenzenesulfonic acid or 3-aminopropanesulfonic acid, the concentration of the acidic electrolyte in the electrolyte is 3.0-3.5 mol / L, the concentration of the vanadyl sulfate is 1.7-2.0 mol / L, and the concentration of the additive is 0.05-0.25 mol / L. The electrolyte can improve the high-temperature stability of VO2 + under the premise of ensuring good electrochemical performance.

The application provides a method for preparing high-purity vanadyl sulfate electrolyte based on carbon slate type stone coal vanadium ore. The method is characterized by the following steps: soaking the ash residue obtained by decarburization and power generation of carbon slate type vanadium ore in mixed acid of 10% sulfuric acid and 10% hydrochloric acid, and obtaining leaching solution after solid-liquid separation; reducing the SO2 generated in the decarburization and power generation process to obtain tetravalent vanadium leaching solution with pH ranging from 1.8 to 2.6; using the P204 / P507 / Cyanex272:TBP:sulfonated kerosene system for multistage countercurrent extraction of the leaching solution; after two-phase separation, using 1-5 mol / L sulfuric acid solution for multistage countercurrent stripping of the vanadium-loaded organic phase to obtain high-purity vanadyl sulfate solution; and obtaining 3.5-valent vanadium electrolyte by electrolysis of the vanadyl sulfate solution. The application can achieve vanadium recovery rate of more than 90%, the prepared vanadium electrolyte has low impurity content, the process flow is short, and the emission of waste gas and waste water is reduced, thereby achieving energy saving and environmental protection.

The application discloses a method for preparing battery-grade vanadyl sulfate electrolyte by using vanadium leaching solution, and comprises the following steps: S1, using vanadium leaching solution with a vanadium ion concentration of 1.0-20 g / L as a raw solution, using sulfurous acid solution or saturated SO2 solution as a desorption solution, carrying out anion resin adsorption-desorption treatment and reduction treatment, and obtaining vanadyl sulfate solution with a vanadium ion concentration of 20-40 g / L; sequentially carrying out extraction and reverse extraction on the vanadyl sulfate solution with a vanadium ion concentration of 20-40 g / L, and obtaining vanadyl sulfate electrolyte with a vanadium ion concentration of 80-160 g / L; and S3, filtering the vanadyl sulfate electrolyte with a vanadium ion concentration of 80-160 g / L after adsorption by an adsorbent, and obtaining battery-grade vanadyl sulfate electrolyte. The application can simultaneously / synchronously realize removal of impurities in the vanadium leaching solution, efficient reduction conversion and enrichment and purification of vanadium ions, and achieves the technical effects of improving product quality, shortening a process flow, improving production efficiency and reducing production cost.

The present invention relates to a method for extracting vanadium from a vanadium slag roasting product and preparing vanadium oxide or vanadyl sulfate. The method comprises the following steps: crushing and grinding the vanadium slag roasting product, performing simultaneous reduction leaching in a leaching medium, adjusting the pH of the leachate to 0-5 with a pH regulator, and maintaining a liquid-to-solid ratio of the leaching medium to the roasted product of 3-20:1, thereby obtaining a leachate containing positive divalent vanadium oxide ions. While leaching the vanadium slag roasting product, the present invention adds a reducing agent to directly control the valence of vanadium in the leachate, achieving a stable tetravalent valence, thereby resolving the problem of low vanadium leaching efficiency caused by the easy hydrolysis of pentavalent vanadium ions. Vanadyl hydroxide is then prepared by a selective precipitation method, which is then calcined under different atmospheres to produce VO2 or V2O5, or vanadyl sulfate is produced by in-situ extraction-stripping in the reducing leachate. The method of the present invention has a short process flow, a high vanadium yield, a compact process interface, reduces the three wastes, and is easily industrialized.

The invention discloses a low-odor and high-corrosion-resistance hydrophilic finish paint for automobile coating as well as a preparation method and application of the low-odor and high-corrosion-resistance hydrophilic finish paint. The hydrophilic finish paint is prepared from the following raw materials in parts by weight: 1 to 5 parts of film-forming resin, 1 to 5 parts of vanadyl sulfate, 0.1 to 1 part of ammonium zirconium carbonate, 0.1 to 1 part of an auxiliary agent and 88 to 97.8 parts of water. According to the hydrophilic finishing paint, by selecting the raw material components and utilizing the complexing ability of the novel resin to corrosion-resistant metal ions and the characteristic of low odor of the novel resin, the corrosion resistance of a coating is effectively improved, and the peculiar smell of the coating is reduced.

The invention provides a short-process method for preparing vanadyl sulfate from vanadium slag calcification roasting tail gas. The method mainly comprises the following steps: mixing vanadium slag and a calcification agent, and roasting to obtain vanadium slag clinker; the clinker enters an acid leaching process to extract vanadium, and roasting tail gas is in countercurrent contact with pre-reduction liquid for pre-reduction; the clinker and dilute sulphuric acid are subjected to countercurrent leaching, and pentavalent vanadium-rich acid leaching liquid is obtained; adding a diluent into the pentavalent vanadium-rich acid leaching solution to obtain a pre-reduction solution; roasting tail gas is introduced into the pre-reduction liquid for reduction, and pre-reduction liquid is obtained; excessive oxalic acid is added into the pre-reduction liquid for impurity removal, and meanwhile pentavalent vanadium ions which are not completely reduced are reduced to form tetravalent vanadium liquid; and separating to obtain a tetravalent vanadium extraction stock solution, and finally preparing a vanadyl sulfate solution through an extraction-washing-reverse extraction process. The method realizes efficient reduction and utilization of the roasting tail gas, has the advantages of simple process, low cost, high vanadium recovery rate, high resource utilization rate and environmental friendliness, and can greatly reduce the treatment cost of the roasting tail gas.

The invention relates to a preparation method and application of a tetravalent vanadium electrolyte capable of reducing residues of a reducing agent, and belongs to the technical field of chemical engineering. The method comprises the following steps: mixing concentrated sulfuric acid with water; oxalic acid is added into the sulfuric acid aqueous solution, the mass ratio of sulfuric acid to oxalic acid is 1: 3.5-4.5, vanadium pentoxide powder is added, heat released by mixing of oxalic acid and vanadium pentoxide continues to be utilized, the reaction rate is increased, and then heating is conducted to 95-100 DEG C; adding concentrated sulfuric acid into the solution so as to continuously utilize heat released by mixing the concentrated sulfuric acid and water, and further heating to 95-100 DEG C; and naturally cooling the obtained solution, and filtering to obtain the reduced tetravalent vanadium electrolyte, namely the vanadyl sulfate solution. The method is short in technological process, high in reaction speed, high in product yield and suitable for industrial scale production.

The invention discloses a 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-one-oxygen vanadium complex as well as a preparation method and application of the 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-one-oxygen vanadium complex. The preparation method comprises the following steps: carrying out a reaction on glucose and piperidine to obtain 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone, carrying out a reaction on 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone and vanadyl sulfate or vanadyl acetylacetonate to obtain a 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone-vanadyl complex, and carrying out a reaction on the 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone and vanadyl sulfate or vanadyl acetylacetonate to obtain the 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone-vanadyl complex. Raceme and enantiomer of the compound are shown in the specification. The obtained complex is used as a PTP1B enzyme inhibitor to be applied to preparation of drugs for reducing blood sugar. According to the invention, 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone with antioxidant activity is used as a ligand to form a complex with vanadium oxide, so that vanadium can play a role in reducing blood sugar, and oxidative stress can be potentially reduced through the antioxidant activity of the ligand.

The application provides a low-temperature sulfur-resistant denitration catalyst and a preparation method thereof, and the preparation method comprises the following steps: adding titanium dioxide into deionized water under stirring to obtain a base slurry; dissolving ammonium metavanadate in dilute sulfuric acid to react to generate vanadyl sulfate, adjusting the pH value to 2-4, and then standing and aging to obtain a vanadium precursor solution; dissolving ammonium heptamolybdate in deionized water, adding dilute sulfuric acid to adjust the pH value to 2-4, and then obtaining a molybdenum precursor solution; first adding the molybdenum precursor solution into the base slurry, mixing uniformly, then adding the vanadium precursor solution, continuing to stir, then adding an additive, stirring uniformly, and controlling the pH value of the slurry in the mixing process to be in the range of 2-4 to obtain a mixed slurry; and performing spray drying and calcination on the mixed slurry, and obtaining the low-temperature sulfur-resistant denitration catalyst after cooling. The catalyst prepared in the application has the characteristics of high dispersion of active components, high low-temperature denitration efficiency, excellent sulfur resistance and the like under the conditions of low temperature and high-sulfur flue gas.

The invention discloses a method for preparing a vanadium electrolyte by removing impurities from vanadium extraction leachate, and belongs to the technical field of electrolytes. In order to solve the problems of multiple types of impurities, high content, difficulty in separation, long flow and the like when the vanadium electrolyte is prepared from the vanadium extraction leachate, the invention provides a method for preparing the vanadium electrolyte by removing the impurities from the vanadium extraction leachate, which comprises the following steps: preparing an extraction agent composite resin from anion resin and an extraction agent; the vanadium extraction leachate is adsorbed through extraction agent composite resin, the pH is adjusted to-1-1, then a reducing agent is added for reduction, and first-stage impurity removal liquid is obtained; adsorbing the first-stage impurity removal liquid through alkali metal impurity adsorption resin to obtain a vanadyl sulfate solution; after the vanadyl sulfate solution is concentrated and enriched, the concentration of sulfate radicals is adjusted, and the vanadium electrolyte is obtained through electrolysis. According to the method, the organic extraction agent is loaded to the ion exchange resin, deep and complete separation of negative and positive impurity ions in the leachate is achieved, and the content of the impurity ions in the obtained vanadium electrolyte is low.

This invention relates to the field of hydrometallurgy and comprehensive resource utilization technology, and discloses a method for preparing vanadium oxysulfate from a solution containing strong acid vanadium salts. The method includes the following steps: (1) Leaching vanadium-containing slag with sulfuric acid to obtain a sulfuric acid leachate; filtering the sulfuric acid leachate to obtain a first vanadium-containing solution; (2) Processing the first vanadium-containing solution obtained in step (1) through an anion exchange membrane assembly to obtain a sulfuric acid solution and a second vanadium-containing solution; (3) Adding a precipitant to the second vanadium-containing solution obtained in step (2), and after solid-liquid separation, obtaining a treated second vanadium-containing solution; adding a pH adjuster to the treated second vanadium-containing solution to obtain a third vanadium-containing solution; (4) Passing the third vanadium-containing solution obtained in step (3) through a vanadium adsorbent; after adsorption saturation, desorption is performed using a desorption solution to obtain a vanadium oxysulfate solution. This invention achieves efficient recovery and recycling of sulfuric acid, significantly reducing the consumption of acid neutralization and alkali neutralization in the leachate.

The invention belongs to the technical field of electrochemical energy storage, and provides an electrolyte, a preparation method and an all-vanadium redox flow battery, the electrolyte comprises an acidic electrolyte, vanadyl sulfate, an additive and water, the additive is 5-amino-2-naphthalene sulfonic acid, 3-aminobenzene sulfonic acid or 3-aminopropanesulfonic acid; in the electrolyte, the concentration of the acidic electrolyte is 3.0 to 3.5 mol / L, the concentration of the vanadyl sulfate is 1.7 to 2.0 mol / L, and the concentration of the additive is 0.05 to 0.25 mol / L. The electrolyte can improve the high-temperature stability of VO < 2 + > on the premise of ensuring good electrochemical performance.

This invention proposes a sealing agent that does not obscure passivation color and its preparation method, belonging to the field of zinc plating and zinc alloy post-treatment technology. The method involves synthesizing a stable sol-gel polymer and adding it to water. After stirring until homogeneous, sodium molybdate and vanadium oxysulfate are added separately. After stirring to dissolve, ethylene acrylate phosphate copolymer, a wetting surfactant, and a bactericide are added and stirred until homogeneous to obtain the sealing agent that does not obscure passivation color. This sealing agent can form a thin nano-coating on the passivated metal surface without obscuring the passivation color, and it provides good uniformity of the sealed workpiece appearance, making it particularly suitable for barrel plating. Furthermore, utilizing the characteristics of a stable sol-gel polymer, the sealing agent can be infinitely diluted with water and remains stable, exhibiting low VOCs and environmental friendliness, and the film layer is water-resistant.

The invention discloses an additive-containing mixed acid group all-vanadium redox flow battery positive electrode electrolyte and application thereof, and belongs to the technical field of redox flow battery energy storage. The positive electrode electrolyte comprises an additive and an active substance, wherein the additive is selected from one or two or more of dimethylamine hydrochloride, diethylamine hydrochloride, dipropylamine, butanediamine and nitrilotriacetic acid; the active substances are VO < 2 + > and VO < 2 + >. The preparation method comprises the following steps: step 1, firstly dissolving vanadyl sulfate in hydrochloric acid to obtain a hydrochloric acid solution of vanadyl sulfate, and then obtaining an electrolyte in an electrolysis mode; and 2, adding the additive into the electrolyte in the step 1, and stirring at room temperature until the additive is completely dissolved. When the positive electrode electrolyte is applied to the mixed acid-based all-vanadium redox flow battery, the problem of chlorine gas precipitation in the charging process of the battery can be obviously improved, the stability of the positive electrode electrolyte is improved, the battery performance of the battery in the long-term cycle process is effectively improved, and long-term stable operation of the battery is realized.

This invention provides a short-process method for preparing vanadium oxysulfate using vanadium slag calcination roasting tail gas. The main steps are as follows: vanadium slag is mixed with a calcining agent and roasted to obtain vanadium slag clinker; the clinker enters an acid leaching process to extract vanadium, and the roasting tail gas is countercurrently contacted with the pre-reduction liquid for pre-reduction; the clinker is countercurrently leached with dilute sulfuric acid to obtain a pentavalent vanadium-rich acid leaching solution; a diluent is added to the pentavalent vanadium-rich acid leaching solution to obtain a pre-reduction solution; roasting tail gas is introduced into the pre-reduction solution for reduction to obtain a pre-reduced solution; excess oxalic acid is added to the pre-reduced solution for impurity removal, and simultaneously, incompletely reduced pentavalent vanadium ions are reduced to form a tetravalent vanadium solution; after completion, a tetravalent vanadium extraction stock solution is obtained, and finally, a vanadium oxysulfate solution is obtained through an extraction-washing-back-extraction process. This invention achieves efficient reduction and utilization of roasting tail gas, and has the advantages of simple process, low cost, high vanadium recovery rate, high resource utilization rate, and environmental friendliness, and can significantly reduce the treatment cost of roasting tail gas.

The present application relates to the technical field of high-purity vanadyl sulfate prepared by extraction method short process, in particular to a new method for preparing high-purity vanadyl sulfate by vanadium slag calcification roasting acid leaching liquid extraction method short process, at least comprising the following steps: (1) extraction: the vanadium-containing acid leaching liquid is acidified and then added into an organic phase for extraction to obtain a vanadium-rich organic phase; (2) vanadium-rich organic phase washing: the vanadium-rich organic phase is washed by multiple-stage countercurrent washing with sulfuric acid aqueous solution to obtain an acid-washed vanadium-rich organic phase, then the acid-washed vanadium-rich organic phase is preliminarily purified with a purification liquid to obtain a preliminarily purified vanadium-rich organic phase, and then pure water is added into the preliminarily purified vanadium-rich organic phase for washing and phase separation to obtain a purified vanadium-rich organic phase; (3) reverse extraction of the purified vanadium-rich organic phase: the purified vanadium-rich organic phase is added with a reverse extraction liquid for reverse extraction treatment to obtain a vanadyl sulfate aqueous solution, which has a short process flow, a small amount of reagent, a low production cost and is easy to realize industrial application.

The application discloses a short-process preparation method of vanadyl sulfate electrolyte based on vanadium residue valence state regulation and application thereof, and belongs to the technical field of vanadium electrolyte. The vanadium residue is leached with sulfuric acid to obtain a leaching solution containing low-valence vanadium; amine organic extractant is used to extract vanadium and chromium in the leaching solution; then, sulfuric acid is used for back extraction; then, phosphoric acid extractant is used to extract and separate vanadium, and finally, sulfuric acid is used for back extraction, so that the vanadium electrolyte is obtained, and the obtained vanadium electrolyte can be used to build a VFB-5kW / 10kWh vanadium battery energy storage system. The application breaks through the established thinking of the traditional vanadium residue oxidation extraction of pentavalent vanadium as a vanadium source to prepare vanadium electrolyte, proposes a new process of directly preparing vanadium electrolyte from vanadium residue extraction of low-valence vanadium solution, constructs a short-process and green new process technology of preparing vanadium electrolyte from vanadium residue, and improves the efficiency of the vanadium electrolyte preparation process and reduces the preparation cost.

This invention provides a method for producing vanadium oxysulfate solution, comprising: (1) mixing vanadium pentoxide, oxalic acid dihydrate, and water uniformly in a reactor to obtain a mixed solution, wherein the mass ratio of vanadium pentoxide, oxalic acid dihydrate, and water in the mixed solution is 1:(0.64-0.66):(3.5-3.6); (2) adding concentrated sulfuric acid to the mixed solution in three stages to prepare the vanadium oxysulfate solution; wherein the total mass m0 of the added concentrated sulfuric acid and the mass m of vanadium pentoxide satisfy m0:m = (2.6-2.8):1. The method of this invention has advantages such as energy saving, mild and controllable operation, and no risk of material spillage.

The invention discloses a method for continuously preparing vanadyl sulfate electrolyte based on a nano-emulsion system, which constructs an integrated process of'centrifugal extraction-centrifugal washing-improved packed tower reduction reverse extraction-continuous replica ', thereby realizing efficient extraction of vanadium from a raw material solution, product purity control and recycling of an extraction agent. And finally, a vanadyl sulfate electrolyte product meeting the requirements of national standard first-grade products is obtained.

The invention discloses a vanadyl sulfate anti-aging composition as well as a preparation method and application thereof, and belongs to the technical field of aging resistance. The vanadyl sulfate anti-aging composition comprises the following active ingredients in parts by mass: 1-10 parts of vanadyl sulfate, 5-20 parts of vitamin E, 2-15 parts of glutathione and / or 1-8 parts of astaxanthin. According to the vanadyl sulfate anti-aging composition disclosed by the invention, the active ingredients are compounded according to a specific proportion, a quaternary active ingredient system with a synergistic effect is constructed, and the active ingredients play roles from different target spots, so that excellent anti-aging performance is shown. Meanwhile, the anti-aging composition can remarkably inhibit the natural oxidation process of vanadyl sulfate and effectively inhibit the generation of toxic + 5-valent vanadium, so that the use safety of the composition is greatly improved, and the chemical stability and bioavailability of the core active component in the long-term storage and use process are also ensured.