260 results about "Vanadium(V) oxide" patented technology

The invention relates to the technical field of vanadium pentoxide preparation, and particularly discloses a preparation method of high-purity vanadium pentoxide, which comprises the following steps: S1, vanadium slag pretreatment: carrying out microwave activation on vanadium slag, and then carrying out ball milling and roasting to obtain clinker; the sulfuric acid-oxalic acid composite acid and the clinker are mixed and leached, the pH is adjusted after leaching is completed, and vanadium-containing leachate is obtained through filtering; s3, vanadium enrichment: heating the vanadium-containing leachate, adding a sodium carbonate solution while stirring, adjusting the pH value, preserving heat and curing, and then carrying out hot filtration to obtain vanadium-rich filter residues; s4, vanadium purification: mixing the vanadium-rich filter residues with a sodium hydroxide solution, stirring, introducing compressed air while stirring, and carrying out hot filtration after the reaction is finished, so as to obtain vanadium-rich filtrate; and S5, calcining: carrying out two-stage calcining on the ammonium metavanadate precursor to obtain high-purity V2O5. The preparation method is high in vanadium recovery rate, and the purity of the prepared V2O5 is 99% or above.

The invention discloses a preparation method of 5N specified-grade high-purity vanadium pentoxide, which comprises the following steps: step S1, taking high-purity ammonium metavanadate as a raw material, mixing the raw material with pure water in proportion, heating for dissolving, and cooling to obtain an ammonium metavanadate solution; s2, enabling the ammonium metavanadate solution to pass through a resin column for adsorption, and collecting column passing liquid; s3, carrying out vacuum concentration on the column passing liquid, cooling and crystallizing the obtained concentrated liquid, and carrying out suction filtration to obtain primary crystals; s4, mixing the primary crystal with pure water in proportion, heating, filtering, cooling filtrate, crystallizing, filtering and washing with water to obtain a secondary crystal; step S5, repeating crystallization operation for 1-3 times to obtain recrystallized ammonium metavanadate; and step S6, putting ammonium metavanadate into a porcelain baking tray, putting the porcelain baking tray into a calcining furnace, vacuumizing, calcining and cooling to obtain a 5N specified-grade high-purity vanadium pentoxide product. The method has the characteristics of simple principle, convenience in operation, high reliability and the like, and the purity of vanadium pentoxide is remarkably improved.

The invention relates to a preparation method of high-purity vanadium pentoxide, in particular to the field of high-purity vanadium pentoxide, which comprises the following steps: adding an impurity removal agent into a phosphorus-containing vanadium solution to remove impurities, and then carrying out solid-liquid separation to obtain filtrate; the obtained filtrate is sequentially subjected to first pH value adjustment, second pH value adjustment, ammonium salt vanadium precipitation, dehydration, calcination deamination and melting, and high-purity vanadium pentoxide is obtained; wherein the impurity removing agent is prepared from calcium salt and a flocculating agent; the final pH value of the first pH value adjustment is 4.5-5.5; the final pH value of the second pH value adjustment is 1.8-2.2. According to the preparation method provided by the invention, the vanadium in the vanadium liquid is efficiently recovered by matching the metallographic phase specific impurity removal process of the vanadium liquid with pH value adjustment, the purity of the obtained vanadium product is greater than or equal to 99.9%, and the recovery rate of the vanadium is greater than or equal to 98%.

The invention provides a method for preparing high-purity vanadium pentoxide from a sodium vanadium solution. The method comprises the following steps: firstly, through chromium removal, calcium removal and silicon removal treatment, reducing the contents of chromium, calcium and silicon in the sodium vanadium solution to a target requirement, namely Crlt; the concentration is 0.005 g / L, and the concentration is Cat; 0.01 g / L, Silt; 0.01 g / L; then, aluminum is removed through a two-step method, the pH of the system can be accurately controlled, and the aluminum content in the solution is reduced to be smaller than 0.001 g / L; finally, ammonium salt is added to obtain AMV sediment, after the potassium content in the AMV sediment is preferably controlled to be reduced to 0.001 wt%, calcination is conducted, a vanadium pentoxide product can be obtained, and the sulfur content can be lower than 0.001 wt%.

The invention relates to the technical field of all-vanadium redox flow batteries, and particularly discloses a composition for promoting continuous production of a vanadium electrolyte and application of the composition. The invention discloses a composition for promoting continuous production of a vanadium electrolyte, which is characterized by specifically comprising the following components in parts by weight: 32-42 parts of concentrated sulfuric acid, 0.8-1.2 parts of a sulfonic acid compound, 0.05-0.15 part of sodium sulfate and 60-66 parts of water, the sulfonic acid compound is selected from any one or more of methanesulfonic acid, ethanesulfonic acid, benzenesulfonic acid, sulfamic acid and p-toluenesulfonic acid. When the composition provided by the invention is used in continuous production of the vanadium electrolyte, the use amount of concentrated sulfuric acid is reduced, vanadium pentoxide can be effectively activated, and the reaction rate is increased; and the produced vanadium electrolyte has excellent electrochemical performance.

The invention belongs to the field of vanadium batteries, and particularly discloses a vanadium battery key material as well as a preparation method and a preparation system thereof. The method comprises the following steps: adding ammonium salt and acid into an alkaline vanadium-containing leaching solution, and carrying out weak acid ammonium salt vanadium precipitation reaction under the conditions that the pH is 4-6 and the temperature is 20-85 DEG C to obtain a sodium ammonium decavanadate solid; the method comprises the following steps: mixing a sodium ammonium decavanadate solid with a solution containing ammonium ions, and carrying out solid-phase crystal transformation ammonium sodium replacement reaction at the temperature of 90-100 DEG C to obtain high-purity ammonium vanadate; directly calcining the high-purity ammonium vanadate or calcining the high-purity ammonium vanadate after re-dissolution recrystallization to obtain high-purity vanadium pentoxide; the high-purity vanadium pentoxide is used for preparing a vanadium battery key material. According to the scheme, the alkaline vanadium-containing leachate serves as the raw material, deep removal of impurities is achieved through weak acid ammonium salt vanadium precipitation and solid-phase crystal transformation ammonium sodium replacement, high-purity ammonium vanadate is prepared, high-purity vanadium pentoxide is further prepared, and the high-performance vanadium battery key material is prepared with the high-purity vanadium pentoxide serving as the raw material.

The invention discloses a rare-earth-based micron soil remediation catalyst as well as a preparation method and application thereof. The catalyst takes micron-sized silicon dioxide as a carrier, a composite oxide of cerium oxide and vanadium pentoxide as an active component and nano-particles of zinc oxide as a cocatalyst; on the basis of the mass of the carrier, the mass percentage content of the active component is 5-10%, and the mass percentage content of the cocatalyst is 5-10%. The catalyst synthesized through the method has the advantages of being good in soil compatibility, high in catalytic efficiency and the like, and the target of low-energy-consumption remediation of organic pollutant soil can be achieved.

A system for plant-mediated synthesis and characterization of vanadium pentoxide (V2O5) nanoparticles, comprising a structurally integrated device configured to perform extraction, reaction, calcination and performance evaluation within a closed automated control loop, wherein the system includes: a basic chassis made of heat-insulated stainless steel, which houses a microcontroller-based central control unit; a bioextract preparation unit fluidically connected to a reactive mixing chamber, the bioextract preparation unit comprising a Soxhlet extractor with a borosilicate condenser, a thermostatically controlled heating jacket and a digital thermocouple to maintain extraction temperatures between 60°C and 70°C; a precursor feed vessel containing an ammonium metavanadate solution with a molarity between 0.1 M and 0.3 M, wherein this vessel is connected to the reaction mixing chamber via an electromagnetically actuated inlet valve and a precision peristaltic pump; a reaction mixing chamber with an inductive heating coil, a magnetic stirrer plate and a temperature and pH monitoring device configured to maintain a uniform reaction temperature of 70±2°C during the precursor-extract interaction; a calcination module consisting of a muffle furnace lined with refractory ceramic material and containing embedded nichrome heating elements controlled by a PID-controlled temperature controller to achieve a heating rate between 5 °C and 10 °C per minute up to a setpoint of 445±5 °C for combustion synthesis; an optical characterization module with integrated UV-VIS spectrometer, Fourier transform infrared analyzer and photoluminescence detector, each optically isolated and electronically connected to the control unit; and a photocatalytic and antibacterial test chamber fluidically connected to the output of the calcination module, the chamber comprising a UV irradiation array, an optical absorption sensor and a temperature-controlled bacterial incubation plate, the central control unit includes a programmable logic controller (PLC) configured to synchronize the operation of all submodules via feedback control loops, which receive data from temperature, pH and optical sensors, thereby automating the synthesis, analysis and testing of V2O5 nanoparticles.

This application provides a KVOH nanomaterial, its preparation method, and an aqueous zinc-ion battery to address the technical problem of low performance of vanadium pentoxide cathode materials in the prior art. The KVOH nanomaterial provided in this application is obtained by a solvothermal reaction in an aqueous ethylene glycol solution. The introduction of potassium ions in the reaction expands the ion transport channels between the electrode material layers, improving the cycle performance of the battery. At the same time, the introduction of tetravalent vanadium also increases the specific capacity of the battery, thereby solving the technical problem of low performance of vanadium pentoxide cathode materials in the prior art.

The present application relates to a kind of carbonized silicon crucible for aluminum alloy smelting and its preparation method.The technical scheme is: carbonized silicon particle A, carbonized silicon particle B, carbonized silicon fine powder A, carbonized silicon fine powder B and xylitol are mixed, immersed in silica sol, dried, heat treated;Silicon dioxide coated carbonized silicon obtained by heat treatment is mixed with alumina powder, vanadium pentoxide and deionized water, to obtain mixed slurry, additional binder, sintering aid, polyacrylamide and gum arabic, mix, ball mill, to obtain carbonized silicon slurry.After exhausting, carbonized silicon slurry is placed in gypsum mold for preparing crucible, stand, pour out excess carbonized silicon slurry, continue to stand, take out the carbonized silicon body after standing, indoor curing, drying, heat treatment at 1300-1500 DEG C, to obtain carbonized silicon crucible for aluminum alloy smelting.The carbonized silicon body prepared by the present application is not easy to break, the sintering temperature of the product is low, the compressive strength is large, the thermal shock stability is high, and the resistance to aluminum alloy melt erosion is strong.

This disclosure concerns a method of extracting vanadium, comprising mixing carbon soot ash with a leaching agent and an oxidising agent in a polar solvent in order to form a mixture and reacting the mixture in order to form vanadium 5 (V) ions; filtrating the mixture in order to separate a vanadium leachate from a leached ash; and purifying the vanadium leachate in order to obtain a vanadium filtrate. A weight ratio of carbon soot ash to polar solvent is about 1:2 to about 1:10. A mole ratio of leaching agent to oxidising agent is about 2:0.3 to about 2:2. This disclosure concerns a method of producing vanadium pentoxide.

A preparation method of a clean aluminum-vanadium alloy based on external electric ignition comprises the following steps that vanadium pentoxide, vanadium trioxide, metal aluminum and ammonium fluoride are mixed, ultrasonic treatment is conducted, and then vacuum treatment is conducted; and adding the obtained mixture into a preheated reactor, electrifying and igniting for reaction, and performing aging treatment after the reaction is completed, so as to obtain an aluminum-vanadium alloy product. According to the aluminum-vanadium alloy, the mass percentage of V is larger than or equal to 80%; the sum of the mass percentages of C, Si, Fe, P, S, B, O, N, H and unavoidable impurities is smaller than or equal to 0.2%.

The invention discloses a zinc ion battery and a preparation method thereof, the zinc ion battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, and the zinc ion battery is characterized in that the positive electrode comprises a vanadium-based material, and the vanadium-based material comprises vanadium pentoxide intercalated by water molecules and metal ions and an MXene coating layer; the electrolyte comprises zinc salt, water and an additive, the additive comprises positive ions and negative ions, and the negative ions have the structure shown in the formula I. According to the zinc ion battery, water molecules and metal ions are used for intercalating vanadium pentoxide and coating MXene, and the water molecules and the metal ions are cooperatively used with the electrolyte with specific composition, so that ions can be quickly intercalated / deintercalated, the intrinsic conductivity of the material is enhanced, the structure of the material is stabilized, vanadium dissolution / metal ion dissolution at the positive electrode side can be prevented, and the service life of the zinc ion battery is prolonged. And the side reactions of interface hydrogen evolution and corrosion caused by decomposition of active water molecules on the zinc negative electrode side are synergistically inhibited. Through the comprehensive action of the factors, the zinc ion battery has excellent electrochemical performance.

The invention relates to the technical field of hydrometallurgy, and provides a method for cleanly extracting vanadium from vanadium slag based on dolomite. According to the method, dolomite is adopted to replace a traditional calcification or sodium salt roasting auxiliary agent to co-roast the vanadium slag, and vanadium in the vanadium slag is roasted through two-step temperature control to be converted into acid-soluble calcium magnesium vanadate roasting clinker. The roasting clinker is subjected to acid leaching to obtain vanadium liquid, the vanadium liquid is subjected to deep impurity removal through a magnesium ammonium phosphate precipitation method, ammonium sulfate is added into the vanadium liquid, the pH value is adjusted, acid ammonium salt vanadium precipitation is conducted, and ammonium polyvanadate is obtained. And washing, filtering, drying and calcining the ammonium polyvanadate to obtain high-purity powder vanadium pentoxide or melting and casting to obtain high-purity tablet vanadium pentoxide. Vanadium precipitation wastewater is subjected to reduction treatment, lime neutralization and solid-liquid separation and then is reused in a leaching system, and cyclic utilization of ammonium salt and water resources is achieved. By means of the technical scheme, the problem that in the related technology, the vanadium leaching rate is low is solved.

The invention relates to the technical field of vanadium chemical industry, and provides a method for extracting vanadium from vanadium slag, which comprises the following steps: mixing vanadium slag with magnesium sulfate and a sulfuric acid solution, and drying, with the addition amount of magnesium sulfate being 2-6 g per 100 g of vanadium slag and the addition amount of sulfuric acid being 3-5 ml per 100 g of vanadium slag; the dried materials are mixed with sodium salt and an aluminum compound, the adding amount of the sodium salt is calculated according to sodium carbonate, the mass ratio of the sodium carbonate to vanadium pentoxide in the vanadium slag is (1.6-1.85): 1, the adding amount of the aluminum compound is calculated according to aluminum oxide, and 3-6 g of aluminum oxide is added into every 100 g of vanadium slag; and the mixture obtained in the step b is roasted and then subjected to leaching treatment, and vanadium leaching liquid and vanadium extraction residues are obtained through solid-liquid separation. According to the method, the content of silicon and phosphorus in the vanadium leaching liquid and the content of sodium in the vanadium extraction residues are reduced, the problems that follow-up impurity removal is needed for the vanadium liquid and additional sodium removal is needed for the residues are solved, the technological process is simplified, the cost is reduced, and the resource utilization rate is increased.

The present application belongs to the technical field of inorganic chemical industry, and particularly relates to a method for preparing manganese vanadate from vanadium pentoxide. The method for preparing manganese vanadate from vanadium pentoxide is original, and the method for preparing manganese vanadate by roasting vanadium pentoxide in an inert gas atmosphere is used. Vanadium pentoxide powder is mixed with manganese carbonate (or manganese oxide) reagent to obtain manganese vanadate. As one of ternary vanadates, manganese vanadate has good electrochemical performance and optical performance, and can be applied in batteries and photoelectric materials. The method has great significance for the study of vanadium slag leaching mechanism and the development of subsequent products.

The invention discloses a metal oxide composite sodium ferric sulfate positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion battery positive electrode materials. The metal oxide composite sodium ferric sulfate positive electrode material comprises the following raw materials in parts by mass: 1-20 parts of sodium sulfate, 2-40 parts of ferrous sulfate, 0.05-1 part of an antioxidant, 0.05-1 part of a carbon source and 0.01-2 parts of metal oxide, the metal oxide is at least one of ferrous oxide, ferric oxide, ferroferric oxide, manganese oxide, manganese dioxide, cobalt oxide, cobaltosic oxide, cobaltic oxide, vanadium monoxide, vanadium dioxide, vanadium trioxide, vanadium pentoxide, nickel oxide and copper oxide. The invention also discloses a preparation method and application of the metal oxide composite sodium ferric sulfate positive electrode material. The method provided by the invention can solve the problems of low conductivity and specific capacity of the existing sodium ferric sulfate positive electrode material, and has the advantages of low cost, strong process adaptability and wide application prospect.

This invention discloses a high-performance V-Mo-Ti-based low-temperature SCR denitration catalyst, using titanium dioxide as a support, with vanadium pentoxide and molybdenum trioxide loaded on the support as active components; wherein, based on the mass of the support, the loading of V₂O₅ is 1.0 wt%–3.0 wt%, and the vanadium element on the catalyst surface contains V 5+ and V 4+ The molar ratio is 3.0:1 to 4.0:1; the loading of MoO3 is 1 wt% to 5.5 wt%. Compared with conventional catalysts, this invention can significantly improve the denitrification activity and efficiency in the low-temperature range, with the K value increasing from 9.14 to 19.41. The raw materials used in this invention are inexpensive, the preparation method is simple, the reaction conditions are mild, and it can endow general catalysts with low-temperature catalytic ability, thus having good economic benefits.

This invention relates to a method for in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste. The technical solution is as follows: vanadium-containing solid waste is ground into powder, and the resulting vanadium-containing solid waste powder is mixed with vanadium pentoxide powder. The resulting vanadium-containing geopolymer precursor is mixed with an alkaline activator and stirred evenly to obtain a vanadium-containing geopolymer slurry. The vanadium-containing geopolymer slurry is placed in a mold, cured, demolded, cured a second time, and crushed to obtain a crushed vanadium-containing geopolymer. The crushed vanadium-containing geopolymer is mixed with deionized water to obtain a vanadium-containing geopolymer aqueous solution. Bismuth nitrate solution is added to the vanadium-containing geopolymer aqueous solution, mixed evenly, and the pH value is adjusted. A hydrothermal reaction is then carried out. Solid-liquid separation, washing, and drying are performed to obtain the visible light photocatalytic geopolymer. This invention can efficiently utilize low-vanadium content and completely eliminate vanadium. The in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste not only effectively decomposes organic pollutants under visible light conditions but also effectively fixes vanadium in the vanadium-containing solid waste.

The invention relates to the technical field of vanadium smelting, and discloses a method for smelting ferrovanadium from a high alkali metal vanadium oxide, which comprises the following steps: mixing conventional vanadium pentoxide, an aluminum product and lime in proportion to form a first prefabricated material, mixing the high alkali metal vanadium oxide, the conventional vanadium pentoxide, the aluminum product and the lime in proportion to form a second prefabricated material, adding the first prefabricated material to the bottom of a smelting furnace, adding the second prefabricated material to the upper part of the smelting furnace, and igniting at the upper part for self-propagating smelting; after smelting is finished, the molten slag is subjected to supplementary heating; after supplementary heating, a reducing agent is injected into the molten slag for alkali removal, and corundum slag is obtained. By optimizing the raw material ratio and improving the smelting process, high-alkali-metal vanadium oxide is efficiently utilized, meanwhile, corrosion of alkali metal oxide to a furnace lining is reduced, smelting safety and stability are guaranteed, meanwhile, the quality of ferrovanadium and corundum slag products is improved, and the requirement of the industry for improving the smelting technology of the high-alkali-metal vanadium oxide is met.

The invention relates to the technical field of flow batteries, in particular to a method for recovering the function of a failed vanadium electrolyte, which comprises the following specific steps: S1, measuring the vanadium ion concentration of each valence state in the failed electrolyte, and determining the valence state of the electrolyte; s2, when the overall valence state of the invalid electrolyte is lower than 3.5 valence, a1, preparing a pentavalent vanadium electrolyte: quantitatively weighing vanadium pentoxide according to the concentration of vanadium ions in each valence state in the electrolyte, dissolving the vanadium pentoxide in sulfuric acid, and performing calibration after the concentration is adjusted; a2, the pentavalent vanadium electrolyte is added into the invalid electrolyte; s3, when the overall valence state of the invalid electrolyte is higher than 3.5, b1, injecting the invalid electrolyte into a negative electrode region of the electrolytic bath; b2, water and sulfuric acid are mixed and then injected into a positive electrode area of the electrolytic cell; b3, the failure electrolyte in the electrolytic bath is quantitatively electrolyzed; the valence state of the electrolyte is determined by measuring the concentration of the vanadium ions, then the invalid electrolyte is recovered in a chemical oxidation and electrochemical reduction mode, the steps are simple, and the recovery efficiency and stability of the electrolyte are improved.

The invention discloses a method for controlling vanadium-aluminum intermediate alloy smelting splashing and achieving primary ignition, and belongs to the technical field of vanadium-aluminum intermediate alloy smelting. According to the method, V2O599.0-F type vanadium pentoxide meeting the requirements of the standard YB / T5304-2017 is used as a raw material, the material is subjected to a self-propagating reaction under the ignition action of a magnesium rod by controlling the particle size of the vanadium pentoxide, the material ratio and the magnesium rod adding condition, and then the stability control and the reaction sufficiency guarantee of the reaction process are achieved; and finally, qualified vanadium-aluminum intermediate alloy is obtained, and the alloy recovery rate is increased. The specific technological process comprises the steps of raw material crushing, material uniform mixing, furnace charging and tamping, magnesium rod ignition smelting and standing cooling, and finally a vanadium-aluminum intermediate alloy blank cake is obtained. The method effectively reduces the occurrence amount of smelting splashing, improves the effective reaction amount of raw materials and auxiliary materials, has the advantages of being high in safety guarantee and easy and convenient to operate, and is suitable for industrial stable production of the vanadium-aluminum intermediate alloy.

The invention discloses an ultralow-carbon unfired magnesia carbon brick for a stainless steel AOD converter. The ultralow-carbon unfired magnesia carbon brick comprises the following raw materials in parts by weight: 95-98 parts of dicalcium fused magnesite, 1-3 parts of graphite, 1-3 parts of resin, 1-3 parts of a metal additive, 3-5 parts of an antioxidant, 1-2 parts of titanium, 1-2 parts of chromium and 1-2 parts of zirconium. Wherein the antioxidant is a mixture of modified nano vanadium pentoxide and rare earth oxide. The invention aims to solve the technical problem of poor oxidation resistance of magnesia carbon bricks.

The invention relates to the technical field of vanadium batteries, and provides a vanadium battery electrolyte and a preparation method thereof.The preparation method comprises the steps that vanadium pentoxide, concentrated sulfuric acid and water are mixed and then heated, then acid ester is added, then boiling, cooling and filtering are conducted in sequence, and the vanadium battery electrolyte is obtained; the mass ratio of vanadium pentoxide to concentrated sulfuric acid is 1: (1.3-1.5); the mass ratio of the vanadium pentoxide to the acid ester is 1: (1.1-1.3); the acid ester comprises the following components in percentage by mass: 50-51% of oxalic acid, 4-5% of sodium sulfite and 45-46% of ethyl acetate. Compared with the traditional vanadium battery electrolyte, the use amount of the concentrated sulfuric acid and oxalic acid is greatly reduced, the obtained electrolyte is weakly acidic, the corrosivity and danger are greatly reduced, and the electrolyte is not easy to separate out and not easy to block a film in the charging and discharging process. In conclusion, compared with the traditional electrolyte, the vanadium battery electrolyte provided by the invention is safer, more environment-friendly and more efficient.

The invention discloses a titanium white waste acid treatment process, and relates to the technical field of industrial waste regeneration. The titanium white waste acid is subjected to microfiltration and membrane electrolysis treatment, sulfuric acid is separated and recycled under the control of constant pressure and constant current, and residual liquid is subjected to electrodialysis treatment to oxidize ferrous ions into ferric hydroxide precipitates and calcined into ferric oxide; carrying out reduction leaching on the titanium-containing material, hydrolyzing to generate metatitanic acid, and calcining to obtain titanium dioxide; oxidizing the hydrolysate to precipitate vanadate, and calcining to obtain vanadium pentoxide; adjusting the pH value of the filtrate, selectively adsorbing scandium through a biological adsorption column, precipitating and calcining the eluent to obtain scandium oxide, and regenerating and recycling the adsorbent through acid pickling. According to the process, through multi-stage treatment and biological adsorption, resource recycling of sulfuric acid, iron, titanium, vanadium and scandium components in the waste acid is achieved, the process is clean and efficient, secondary pollution of a traditional process is avoided, and a green low-carbon solution is provided for waste acid treatment in the titanium dioxide industry.

A method for preparing vanadium pentoxide by using ammonium metavanadate, comprising the following steps: (1) preparation of an oxidant loaded with ozone and chloromethyl polystyrene resin of graphene oxide; (2) heating and dissolving crude ammonium metavanadate in water, adjusting the pH value to 8-9 by using a sodium hydroxide solution after dissolving, filtering to obtain a sodium metavanadate solution; (3) heating the sodium metavanadate solution to 60-80 DEG C, adding the oxidant loaded with ozone and chloromethyl polystyrene resin of graphene oxide, stirring for more than 20 minutes, filtering to obtain a filtrate; (4) adding ammonium metavanadate crystals to the obtained filtrate for recrystallization, obtaining ammonium metavanadate precipitate, and performing solid-liquid separation and drying to obtain ammonium metavanadate crystals; (5) calcining the ammonium metavanadate crystals to obtain vanadium pentoxide. The purity of the obtained vanadium pentoxide is greater than or equal to 99.99%, and the sum of the content of tetravalent vanadium and trivalent vanadium is less than or equal to 0.003%.

The invention belongs to the technical field of target materials, and particularly relates to a tin oxide-based composite target material and a preparation method thereof. The tin oxide-based composite target material provided by the invention comprises tin oxide, doped oxides and sintering aids, the doped oxides are antimony pentoxide, vanadium pentoxide, nickel oxide and tungsten trioxide, and the sintering aids are magnesium oxide and yttrium oxide. The antimony pentoxide, the vanadium pentoxide, the nickel oxide and the tungsten trioxide are used as doped oxides, so that the electrical and optical properties of the target material are effectively improved; magnesium oxide and yttrium oxide are adopted as sintering aids, grains are refined, and the compactness and the mechanical property of the target material are improved; atomic-scale mixing of part of elements is achieved through a sol-gel method, then atomic-scale doping is conducted through a high-energy ball milling method, the distribution deviation of the elements in a matrix is reduced, sintering is conducted through a discharge plasma furnace, and the volatilization loss of the elements and the pore defect in the target material are reduced.

The invention discloses a vanadium-aluminum alloy and a preparation method thereof. The preparation method comprises the following steps: S101, coating the inner wall of a water-cooled copper crucible with a magnesium oxide coating; s102, vanadium pentoxide with the bulk density larger than 1.05 g / cm < 3 >, metal aluminum particles and a cooling agent are evenly mixed; s103, the mixed raw materials are added into a water-cooled copper crucible and subjected to water cooling, and after compaction, an aluminothermic reaction is triggered in the mode that an ignition agent is ignited on the upper portion; and after the thermit reaction is finished, water cooling is continuously carried out, and finally the finished vanadium-aluminum alloy is obtained. According to the preparation method, the water-cooled copper crucible is adopted as a reaction device, the solidification speed of alloy liquid can be increased, the specific gravity segregation of the alloy is effectively improved, and air holes in the alloy are reduced by controlling the bulk density of vanadium pentoxide, coating the inner wall of the crucible with a magnesium oxide coating and the like; therefore, the high-quality vanadium-aluminum alloy which is uniform in component, compact in crystal and free of obvious pores inside is obtained.

The invention relates to a preparation method of high-purity vanadium trioxide. The preparation method comprises the following steps: (1) preparing a glucose-montmorillonite hydrothermal carbon composite material; (2) mixing vanadium pentoxide powder, graphene and the glucose-montmorillonite hydrothermal carbon composite material obtained in the step (1), stirring and reacting for 1-3 hours at 600-800 DEG C, adding water after the reaction, stirring and dissolving, and then filtering to remove insoluble substances to obtain a precursor solution; (3) adding ammonia water into the precursor solution obtained in the step (2), and reacting while stirring to generate a precipitate; the reaction is finished at the moment, and the pH value of the solution is 8-10; filtering and taking a precipitate; (4) drying the precipitate obtained in the step (3) to obtain a precursor; the precursor is placed in an inert atmosphere to be calcined, the calcination temperature is 500-600 DEG C, and the time is 1-3 h; the high-purity vanadium trioxide is obtained. The purity of the obtained vanadium trioxide is greater than or equal to 99.99%. The particle size is 20-80 nm.

The invention discloses a defect-state manganese-vanadium oxide positive electrode material and a preparation method and application thereof, and belongs to the technical field of battery materials, the defect-state manganese-vanadium oxide positive electrode material is MnxV2O6-y, 0 lt; xlt; 1, 0lt; yt; Yt; 1, the defect-state manganese vanadium oxide positive electrode material is synthesized by taking vanadium pentoxide and a divalent manganese-based compound as raw materials; vanadium pentoxide is adopted as a precursor, the vanadium pentoxide is treated through a hydrothermal method and a calcination method, the defect-state manganese-vanadium oxide material with manganese vacancy and oxygen vacancy can be successfully prepared, and the material has excellent structural stability, good conductivity and high electrochemical activity. When the defect-state manganese vanadium oxide positive electrode material is applied to an energy storage battery, relatively high electrochemical performance and excellent cycling stability can be shown.