51 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 invention relates to a vanadyl sulfate electrolyte based on shale vanadium-rich liquid and a preparation method of the vanadyl sulfate electrolyte. According to the technical scheme, the shale vanadium-rich liquid is subjected to reduced pressure evaporation, and high-concentration vanadium-rich liquid is obtained; standing the high-concentration vanadium-rich liquid in a low-temperature environment for cooling crystallization, and carrying out solid-liquid separation for the first time to obtain a high-purity vanadium-rich liquid; according to the solid-to-liquid ratio of 1-15 Kg / t, seed crystals and the high-purity vanadium-rich liquid are mixed and stirred, and turbid liquid is obtained; crystallizing the turbid liquid in a constant-temperature environment; carrying out secondary solid-liquid separation to obtain vanadyl sulfate crystals; and dissolving the vanadyl sulfate crystal in a dilute sulfuric acid solution according to a solid-to-liquid ratio of 400-575 Kg / t to prepare the vanadyl sulfate electrolyte based on the shale vanadium-rich liquid. The method has the characteristics of being simple in process, low in medicament consumption, environment-friendly, high in safety and convenient to adjust the vanadium concentration of the electrolyte, the prepared vanadyl sulfate electrolyte based on the shale vanadium-rich liquid is high in purity, and separation of vanadium and impurities in the shale vanadium-rich liquid is effectively 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 invention discloses an environment-friendly hybrid film forming agent as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an L-cysteine solution and an environment-friendly metal salt solution; the metal salt is selected from one of vanadyl sulfate, stannous sulfate, neodymium nitrate, yttrium nitrate and cerium nitrate; and mixing the L-cysteine solution and the metal salt solution to obtain a mixed solution, and adjusting the pH value to 4-4.5 to obtain the environment-friendly hybrid film forming agent. L-cysteine serves as a main body and is matched with non-toxic metal ions to prepare the hybrid film forming agent, the L-cysteine forms a Cu-S bond with the surface of metal copper through sulfydryl and is adsorbed on the surface of the copper, carboxyl and amino in the L-cysteine can be coordinated with the added metal ions, and the metal ions are adsorbed on the surface of the copper; a film which is more compact and more excellent in performance is formed on the surface of the protected metal copper; through coordination of metal ions and amino acid functional groups, the driving force of the film-forming agent is larger than that of a pure environment-friendly organic film-forming agent, and the film-forming effect is better.

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 belongs to the technical field of all-vanadium redox flow batteries, and relates to a preparation method of a vanadium electrolyte and solid vanadyl sulfate, and the preparation method of the vanadium electrolyte comprises the following steps: based on pH value adjustment in a vanadium molybdate solution and a reverse extraction reagent, realizing co-extraction of vanadium and molybdenum elements in the vanadium molybdate solution by extracting an organic phase and sequential reverse extraction and recovery of the molybdenum and vanadium elements, the extraction organic phases for extracting vanadium and molybdenum elements have the same composition; and purifying the recovered vanadium product to prepare the vanadium electrolyte. The problems that in the prior art, synchronous recovery of various vanadium and molybdenum elements is difficult to achieve, the vanadium element is difficult to recycle, the vanadium recovery rate is low, the purity of recovered products is low, environmental pollution is large, the requirement for the purity of vanadium raw materials is high, the steps of a vanadium raw material purification preparation process are complex, and vanadium is difficult to separate from vanadium and molybdenum homologous materials are solved. The method overcomes the defects of low yield and low product purity caused by poor separation effect of elements in the vanadium molybdate solution in the prior art.

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.

The invention discloses a comprehensive separation and extraction method for vanadium, titanium and iron in vanadium titano-magnetite, and belongs to the technical field of metallurgy. The method includes the following steps that acidolysis mother liquor rich in vanadium and iron and high-titanium slag with titanium as the main component are obtained through external field strengthening hydrochloric acid leaching; carrying out hydrochloric acid analysis on the acidolysis mother liquor rich in vanadium and iron to generate hydrogen chloride gas, adding a neutralizer, and carrying out solid-liquid separation to obtain high-vanadium slag and an acidic solution I containing free hydrochloric acid and ferric chloride; performing extraction and reverse extraction on the high-vanadium slag to obtain a high-purity vanadyl sulfate solution final product; removing calcium from the acid solution I containing free hydrochloric acid and ferric chloride and the raffinate to obtain an acid solution II containing free hydrochloric acid and ferric chloride; evaporating and concentrating an acid solution II containing free hydrochloric acid and ferric chloride, and then burning to generate a metal oxide mainly containing ferric oxide and hydrogen chloride gas; the high titanium slag and concentrated hydrochloric acid are subjected to enhanced reaction under the action of an external field, and titanium dioxide is obtained through calcination. The method can be used for efficiently and comprehensively extracting vanadium, titanium and iron, and has the advantages of high recovery rate, environmental protection property, economical efficiency and high-value utilization.

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 present invention provides a highly soluble vanadium sulfate, a preparation method thereof and an application, comprising the following steps: mixing V2O4, sulfuric acid and a solvent, and reacting at 60-100 °C for 1-8 h to prepare a high-concentration vanadyl sulfate solution; electrolytically reducing the high-concentration vanadyl sulfate solution until the high-concentration vanadyl sulfate solution is completely converted into a trivalent vanadium sulfate solution; adding sulfuric acid to the trivalent vanadium sulfate solution and then crystallizing, wherein the addition amount of sulfuric acid satisfies V:SO4 2‑ = 1:0.5-1.5, and filtering to obtain V2(SO4)3 crystals; adjusting the valence state by adding vanadium pentoxide according to the molar ratio of V 3+ :V 5+ = 1:0.9-1.0, and using the obtained low-concentration vanadyl sulfate solution to prepare a high-concentration vanadyl sulfate solution. The preparation method of the highly soluble vanadium sulfate of the present invention is environmentally friendly and pollution-free, the raw materials are recycled without waste, and the prepared vanadium sulfate has high purity, good solubility, and can be used to prepare the electrolyte crystals of a vanadium redox flow battery.

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.

Provided herein are pharmaceutical compositions and dietary supplements comprising vanadyl sulfate (VS) and method of use thereof for the induction of cell death in senescent cells. In particular. VS compositions find use in clearance of age-related and / or therapy-induced senescent cells and reduction / elimination of senescence associated secretory phenotype (SASP)-induced inflammatory environments in subjects. and therefore in the treatment / prevention of age-related conditions and / or cancer.

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 invention relates to the field of preparation of vanadyl sulfate crystals, in particular to a method for extracting vanadyl sulfate crystals from a high-acid system, which comprises the following steps: concentrating a solution containing vanadium ions to obtain a concentrated solution; the concentrated solution is loaded to a chromatographic column, adsorption tail liquid is obtained, and the stationary phase of the chromatographic column is anion exchange resin; crystals in the adsorption tail liquid are separated out, and vanadyl sulfate crystals are obtained. According to the method, the solution containing the vanadium ions in the high-acid system is treated through the anion exchange resin, sulfate radicals in the solution containing the vanadium ions are adsorbed through the anion exchange resin, meanwhile, hydroxyl radicals are released, the acidity of the solution containing the vanadium ions can be reduced, the viscosity of the solution can be reduced, subsequent nucleation and precipitation of vanadyl sulfate crystals are facilitated, and the purity of the solution containing the vanadium ions is improved. The method provided by the invention is simple and convenient to operate, the efficiency of extracting the vanadyl sulfate crystal is high, and the vanadyl sulfate crystal extracted by the method provided by the invention is obvious in particle, non-sticky and good in resolubility.

The utility model relates to the technical field of vanadyl sulfate solution recovery devices, and discloses a vanadyl sulfate solution oil-water separation device which comprises a separation box, a filtering box is arranged on the left side of the top of the separation box, a discharging groove is welded to the rear side of the top of the filtering box, and a separation device is fixedly installed on the rear side of the top of the separation box. A separation plate is arranged on the right side of the first isolation plate, and an isolation assembly is slidably connected into the separation plate. According to the oil-water separation device disclosed by the utility model, impurities in the recovered vanadyl sulfate solution can be filtered in the filter box through the mutual cooperation of the filter box and the separation device, and the filtered vanadyl sulfate solution can be heated through the separation device, so that the oil-water separation speed in the vanadyl sulfate solution is increased; meanwhile, the air blower blows floating oil to the position of the scraping plate, floating oil dirt is removed through the scraping plate, the oil dirt is discharged from the oil discharging hole, a solution is discharged from the water discharging hole, and therefore the oil-water separation effect is achieved.

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 present invention belongs to the field of recovery of waste residue oil hydrogenation catalysts, and particularly relates to a method for preparing vanadyl sulfate electrolyte by using waste residue oil hydrogenation catalysts. The method uses waste residue oil hydrogenation catalysts as raw materials, and prepares high-purity vanadyl sulfate solution through the preparation process of "calcination - leaching - impurity removal - reduction - extraction - back extraction". On the one hand, it solves the problem of solid waste treatment. On the other hand, by using the solvent extraction method, vanadium is selectively recovered from high-concentration vanadium-containing solutions, greatly reducing the production cost. The obtained vanadyl sulfate solution has high purity, few impurities and high production efficiency.

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.