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

The invention relates to the technical field of catalyst preparation, and discloses a vanadium-based catalyst and a preparation method and application thereof. The vanadium-based catalyst comprises modified diatomite, an active component and an auxiliary active component, wherein the active component and the auxiliary active component are loaded on the modified diatomite; wherein the content of crystalline SiO2 in the modified diatomite is not less than 90%, the active component comprises vanadium pentoxide, and the auxiliary active component comprises potassium sulfate. The vanadium-based catalyst is an anti-resistance vanadium-based catalyst, the filling amount of the catalyst is small, and the filling amount of the catalyst can be reduced by 35% on the premise that the same performance is achieved, so that the pressure drop of a sulfuric acid device is greatly reduced, the total conversion rate of SO2 is guaranteed, and the method is particularly suitable for a production device for preparing sulfuric acid through waste acid cracking with high raw material gas impurity content; and the method has great advantages on long-period operation.

The invention relates to the technical field of waste catalyst recovery, and particularly discloses a method for recovering valuable metals from a waste catalyst containing vanadium and molybdenum. Comprising the following steps: S1, heating and roasting the waste catalyst containing vanadium and molybdenum, continuously heating and roasting, and cooling to obtain a roasted material; s2, mixing the roasted material with a sulfuric acid solution A containing oxalic acid, and heating and leaching to obtain a leaching solution A and a residue A; mixing the residue A with a sulfuric acid solution B containing thiourea and ethylenediaminetetraacetic acid, heating, carrying out secondary leaching to obtain a leaching solution B and a residue B, and washing the residue B with an acid solution to obtain a washing solution; combining the leaching solution and the washing solution to obtain a combined solution; s3, adjusting the pH value of the mixed solution to 2.5-3, then adjusting the pH value to 4.5-5, adding a dimethylglyoxime alcohol solution, and heating to obtain a purified solution; uniformly mixing the purified liquid with the extraction liquid to obtain an organic phase containing vanadium and molybdenum; and S4, reverse extraction and product preparation. The ammonium molybdate and the vanadium pentoxide obtained in the invention have high purity, and the recovery rate of vanadium and molybdenum is high.

The invention relates to the technical field of ceramic substrates, and provides an efficient heat dissipation multilayer ceramic substrate and a preparation method thereof. Raw materials of the multilayer ceramic substrate comprise the following components in parts by weight: 110 parts of aluminum oxide, 8-16 parts of vanadium pentoxide, 1-3 parts of a dispersing agent, 2-4 parts of a sintering aid, 8-12 parts of a binder, 0.5-2 parts of a plasticizer and 70 parts of water. The aluminum oxide comprises aluminum oxide I and aluminum oxide II in a weight ratio of (4-9): 1; the specific surface area of the aluminum oxide I is 47-76m < 2 > / g, and the specific surface area of the aluminum oxide II is 6.8-8m < 2 > / g. According to the technical scheme, the problem that the fracture toughness of the multi-layer ceramic substrate is poor in the prior art is solved.

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 relates to the technical field of electronic devices, in particular to a synaptic memristive device with a vertical structure and a preparation method and application of the synaptic memristive device. The invention provides a synaptic memristor with a vertical structure. The synaptic memristor structurally comprises a substrate, a bottom electrode, an active layer, an electrolyte layer and a top electrode which are stacked in sequence. Wherein the active layer is a vanadium pentoxide film which is excellent in electrical property and optical response, and the sensitivity and plasticity of the device can be improved; the electrolyte layer adopts polyethylene oxide ionic glue, so that the resistance change characteristic of the active layer can be adjusted, the reaction between the active layer and the top electrode can be prevented, and the service life of the device is prolonged; the bottom electrode is an indium tin oxide thin film, has good compatibility with an active layer interface, can promote oxygen vacancy migration, and optimizes the resistance switching performance. Through mutual coordination of the materials, the device can generate microampere-level current under millivolt-level stimulation, shows high-sensitivity synaptic plasticity, and is suitable for a high-performance neuromorphic computing system.

The invention belongs to the field of hydrometallurgy, and particularly discloses a high-purity vanadium oxide electrode and a preparation method thereof. The method comprises the following steps: pre-treating the alkaline vanadium leaching solution by using an activated aluminum oxide adsorption column to obtain a pre-treated solution; adding a composite impurity removal agent taking modified lignosulfonate as a main agent into the pretreatment liquid for primary impurity removal to obtain primary impurity-removed filtrate; adding a calcium hydroxide suspension and a flocculating agent into the primary impurity-removed filtrate for secondary impurity removal to obtain secondary impurity-removed filtrate; purifying the secondary impurity-removed filtrate by using an ion exchange column to obtain a purified solution; ammonium salt is added into the purified liquid for vanadium precipitation, and ammonium metavanadate crystals are obtained; calcining the ammonium metavanadate crystal to obtain high-purity vanadium pentoxide; and preparing the high-purity vanadium oxide electrode by using the high-purity vanadium pentoxide. According to the scheme, the high-purity vanadium pentoxide is prepared by taking the alkaline vanadium leaching solution as a raw material through a multi-stage deep impurity removal process, and the high-purity vanadium oxide electrode is prepared by taking the alkaline vanadium leaching solution as the raw material.

The invention provides a preparation method of a vanadium electrolyte for an all-vanadium redox flow battery, the vanadium electrolyte and application. The method comprises the following steps: (1) dissolving concentrated sulfuric acid in water to obtain a sulfuric acid solution with a preset concentration, then adding vanadium pentoxide into the sulfuric acid solution, and reacting to obtain a first vanadium solution; (2) the temperature of the first vanadium solution is kept to be the preset temperature, low-valence vanadium oxide is added into the first vanadium solution for reaction, water or hydrochloric acid is supplemented in the reaction process, a second vanadium solution is obtained, and the low-valence vanadium oxide is vanadium oxide with the valence of 3-3.5; and (3) filtering the second vanadium solution to obtain the vanadium electrolyte. The method provided by the invention can save energy consumption, reduce cost and improve dissolution efficiency.

The present invention discloses an aqueous zinc-ion battery, comprising: a positive electrode sheet, a negative electrode sheet and an electrolyte. The positive electrode material of the positive electrode sheet is a layered vanadium-based positive electrode material. Since cations and water molecules are inserted into the layers of vanadium pentoxide, the interlayer spacing is increased and the structure of the host material is supported and stabilized. Therefore, the fast and reversible insertion and extraction performance of charge and discharge ions can be improved, and the high rate and long cycle life of the layered vanadium-based positive electrode material can be achieved. The negative electrode sheet is a zinc foil with a surface coating. By defining the thickness of the surface coating to be 100 nm to 20 μm, the surface coating can prevent the zinc foil from directly contacting the electrolyte, and zinc will be deposited between the coating and the zinc foil during the charge and discharge process. In this way, the direct contact between zinc and the electrolyte is avoided, which helps to solve problems such as dendrites, corrosion and hydrogen evolution of the zinc negative electrode. Compared with the traditional aqueous zinc-ion battery, the electrochemical performance of this aqueous zinc-ion battery is enhanced.

The present invention provides an aviation-grade vanadium-aluminum alloy and a preparation method thereof, and belongs to the field of alloy technology. The preparation method of the aviation-grade vanadium-aluminum alloy provided by the present invention comprises the following steps: mixing vanadium pentoxide and aluminum particles and then pressing to obtain a mixture sheet; subjecting the mixture sheet to a vacuum aluminothermic reaction under side-blowing argon gas, and then cooling to obtain a vanadium-aluminum alloy ingot with an upper layer of an aluminum oxide layer; the angle between the argon gas pipe of the side-blowing argon gas and the horizontal direction is 30 to 60°; removing the aluminum oxide layer on the upper layer of the vanadium-aluminum alloy ingot to obtain an aviation-grade vanadium-aluminum alloy. The present invention can destroy the high vacuum area by the angle of the side-blowing argon gas during the vacuum aluminothermic reaction, so that the aluminum oxide slag inside the vanadium-aluminum alloy is completely separated from the vanadium-aluminum alloy ingot, and a floating aluminum oxide layer is formed on the surface of the vanadium-aluminum alloy ingot, and at the same time, it is in an argon gas protective atmosphere to ensure that the nitrogen element in the vanadium-aluminum alloy ingot will not increase, thereby reducing the aluminum oxide inclusion content and nitrogen content of the vanadium-aluminum alloy.

The invention provides a vanadium aluminum phosphate electrode material and a preparation method thereof. In target product components, an aluminum source, a vanadium source and a phosphorus source are respectively aluminum nitrate or other aluminum sources, vanadium pentoxide or ammonium vanadate, ammonium dihydrogen phosphate, phosphoric acid or other phosphorus sources, and a nitrogen source of nitrogen-doped carbon is from polyvinylpyrrolidone or other nitrogen sources of a gel component; the carbon source is selected from polyvinyl alcohol and glycerol. By adopting an exogenous plasticizing physical crosslinking sol-gel method, in the whole reaction system, uniform distribution of reaction ions and intermediates is maintained, and finally, gel is networked, so that the problem of capacity fading caused by an unstable structure of an existing aluminum ion battery positive electrode material in a circulating process is solved, and the service life of the aluminum ion battery positive electrode material is prolonged. And the problems of high reaction system selection requirement, long preparation period and complex process of the existing endogenous covalent polycondensation sol-gel method for preparing the electrode material are solved.

The invention discloses an AgVO material with modified vanadium dioxide doped with silver ions, a preparation method of the AgVO material and application of the AgVO material in an aqueous zinc ion battery. The silver ion doped modified vanadium dioxide AgVO material is prepared by the following steps: firstly, enabling vanadium pentoxide and anhydrous oxalic acid to react in water to obtain a clear dark blue solution; and then carrying out hydrothermal reaction on the dark blue solution and silver nitrate at 175-185 DEG C to obtain the silver vanadium oxide composite material with a nanofiber bundle microstructure, wherein the silver vanadium oxide composite material is formed by doping silver ions on the surface and inside of a VO2 material. The silver ion doped modified vanadium dioxide AgVO material provided by the invention has a nanofiber bundle microstructure, and an aqueous zinc ion battery taking the silver ion doped modified vanadium dioxide AgVO material as a positive electrode active material has excellent capacity, cycling stability and rate capability and excellent electrochemical performance.

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 discloses a chloride ion battery for realizing bromine / chlorine synergistic chemistry and a preparation method thereof, and belongs to the technical field of redox batteries. The chloride ion battery takes graphite paper coated with vanadium pentoxide and graphite as a positive electrode, wherein the mass ratio of the vanadium pentoxide to the graphite is (0.5: 1)-(2: 1); zinc foil is used as a negative electrode, and an electrolyte is a mixed aqueous solution of tetramethylammonium chloride and lithium bromide. A double-halogen system of a V2O5-graphite composite positive electrode is adopted, chlorine species are chemically stabilized through the action of bromine, BrCl is generated in the charging process to inhibit Cl2 formation, and meanwhile, the intercalation energy barrier of chlorine is reduced; according to the salt-in-water electrolyte based on tetramethylammonium chloride, an electrochemical window is expanded to 3.0 V, and BrCl hydrolysis is effectively inhibited. The high-voltage halogen ion battery prepared by the method can realize a 2.3 V discharge platform, provides a specific capacity of 600mAh g <-1 >, has a capacity retention rate of 90% after 200 cycles, and opens up a safe development path for the high-voltage halogen ion battery without toxic gas emission. In addition, the battery system is simple in structure and has remarkable cost benefits.

The invention discloses preparation of an aqueous zinc ion battery positive electrode material and a detection method of charge reaction of the aqueous zinc ion battery positive electrode material in a metal ion battery, and belongs to the technical field of batteries. The invention provides the preparation method of the vanadium-based positive electrode material, which is simple in process and low in cost. The preparation method of the positive electrode material comprises the following steps: grinding vanadium pentoxide powder; performing ultrasonic treatment with deionized water, adding inorganic salt, sealing, performing water bath heating reaction, and performing centrifugal washing; and then drying or freeze-drying to finally obtain the batched and high-performance positive electrode material. In 8000 times of charging and discharging, the positive electrode material provided by the invention has excellent cycling stability, and the capacity retention rate is as high as 93%. In addition, an in-situ alternating-current impedance technology is used for rapidly detecting the charge transfer process in the battery, and complex and expensive in-situ X-ray diffraction and transmission electron microscope technologies are avoided. The vanadium pentoxide activation process is accurately controlled through the water bath, the process is simple, the cost is low, and the method has good batch production potential and application prospects.

The invention discloses a process for extracting high-purity vanadium pentoxide from ammonium polyvanadate, and belongs to the technical field of nonferrous metallurgy. According to the process, efficient purification of vanadium pentoxide is achieved through the steps of sodium hydroxide dissolution, pH adjustment, gradient impurity removal, precise filtration, freezing-unfreezing circulation, high-purity water washing, centrifugal dewatering, two-stage firing and the like. In the process, the gradient impurity removal technology effectively reduces the content of impurities such as iron, sodium and the like, the precision filtration system ensures low residue of the impurities, the freezing-unfreezing circulation step further improves the crystal purity, and the two-stage firing process realizes directional conversion of the alpha-V2O5 crystal form. The purity of the obtained vanadium pentoxide product reaches up to 99.99% or above, the Na < + > content is smaller than or equal to 2 ppm, the Fe residue is smaller than or equal to 5 ppm, the alpha-V2O5 crystal form proportion is larger than or equal to 98%, the problems that in a traditional process, deep impurity removal is difficult, the product purity is insufficient, and crystal form conversion is incomplete are remarkably solved, and an effective technical approach is provided for preparing high-purity vanadium pentoxide.

The invention relates to a multi-element synergistic doped ATO target material and a preparation method thereof. Comprising the following steps: 1) uniformly mixing water and a powder dispersant, then adding an oxide 1 (at least one of tantalum pentoxide, niobium pentoxide, vanadium pentoxide, gallium oxide and tungsten trioxide), an oxide 2 (at least one of zinc oxide, copper oxide, cobalt oxide, manganese oxide and cerium oxide) and ATO raw material powder, and mixing and homogenizing to prepare slurry; 2) grinding the slurry and adding a powder forming adhesive; 3) carrying out spray drying granulation on the ground slurry; according to the preparation method, the ATO target material with high compactness (relative density gt, 98.5%) and low resistance (resistivity lt, 5 * 10 <-3 > omega.cm) is prepared through multi-element synergistic doping of the oxide, and the problem that compactness and conductivity of the ATO target material are difficult to consider at the same time in the prior art is solved.

The invention relates to the technical field of preparation of intermediate alloys for aerospace-grade titanium alloys, and discloses a vanadium-aluminum intermediate alloy for an aerospace-grade titanium alloy and a preparation method of the vanadium-aluminum intermediate alloy. According to preparation of the alloy, high-purity aluminum particles, vanadium pentoxide, calcium oxide, cryolite and aluminum foil serve as raw materials, a primary alloy is prepared through a vacuum aluminothermy method based on an aluminum foil bag-shaped powder bag type material, then the primary alloy is subjected to finishing treatment to obtain alloy particles, then the alloy particles are sequentially subjected to alkali washing, filtering, vacuum heat treatment and other links, and the aluminum foil bag type aluminum alloy is obtained. And finally, the AlV65 alloy which is higher in purity, better in component uniformity and purer in microstructure is prepared. The method can emphatically solve the problems that the existing vanadium-aluminum alloy is high in gas phase impurity content, heavy in component segregation and more in microscopic inclusion, and is of great significance to construction of a more tough aerospace industry chain and promotion of high-quality development of the industry.

The invention provides metal ion intercalation vanadium dioxide as well as a preparation method and application thereof, belongs to the technical field of aqueous iron ion batteries, and aims to solve the technical problem of low energy density of an aqueous iron ion battery positive electrode material. The preparation method of the metal ion intercalation vanadium dioxide comprises the following steps: dispersing vanadium pentoxide, a reducing agent and a metal source into a solvent to obtain a mixed solution; and reacting the mixed solution to obtain the metal ion intercalation vanadium dioxide nanosheet. The synthesis method provided by the invention is a one-step hydrothermal method, the synthesis method is relatively simple, environment-friendly and relatively low in cost, and the prepared material is a relatively uniform nanosheet. The prepared metal ion intercalation vanadium dioxide nanosheet is used as a positive electrode material of an iron ion battery, 284.32 mAh g <-1 > can be provided under the current density of 0.1 A g <-1 >, and the average discharge efficiency is as high as 99%.

The invention relates to a fluxing agent for gallium oxide crystal growth and a growth method. The fluxing agent for growth of the gallium oxide crystal comprises vanadium pentoxide or a mixture composed of vanadium pentoxide and boron oxide. The fluxing agent does not contain toxic and harmful components such as lead oxide and lead fluoride, gallium oxide crystals can grow at a moderate temperature, volatilization and decomposition reactions of gallium oxide during high-temperature growth are effectively inhibited, and component segregation of the crystals in the growth process is improved; the gallium oxide crystal has relatively low viscosity, is beneficial to solute transportation in a crystal growth process, and can effectively reduce or even eliminate inclusion defects in the gallium oxide crystal; the method has a wide crystallization temperature interval, can improve the stability of crystal growth, and is beneficial to obtaining large-size and high-quality gallium oxide crystals.

The invention relates to a method for efficiently and selectively extracting vanadium from vanadium shale. According to the technical scheme, the method comprises the steps that vanadium shale is crushed and ground, vanadium shale mineral powder is obtained, a sulfuric acid solution I and the vanadium shale mineral powder are mixed, mixed ore pulp is obtained, a leaching aid is added for pulp mixing, stirring and solid-liquid separation are conducted, and vanadium-containing leaching liquid and leaching residues are obtained; adding sodium sulfite into the vanadium-containing leaching solution, heating and stirring to obtain a reduced solution; adjusting the pH value of the reduced solution, and carrying out solid-liquid separation to obtain an extraction stock solution and neutralization slag; mixing the extraction organic phase and the extraction stock solution, performing countercurrent positive extraction, mixing the obtained loaded organic phase and a stripping agent, and performing countercurrent reverse extraction to obtain a vanadium-rich solution; adding sodium chlorate into the vanadium-rich solution, heating and stirring to obtain an oxidized solution, adjusting the pH value of the oxidized solution, and carrying out hydrothermal reaction and solid-liquid separation to obtain a vanadium precipitation mother solution and a vanadium precipitation intermediate product; and roasting the vanadium precipitation intermediate product to obtain vanadium pentoxide. The method is high in vanadium leaching rate, low in concentration of impurity iron in the extraction solution, short in extraction stage and high in product purity.

The invention provides a method for preparing high-purity vanadium pentoxide from carbonation leachate. The method comprises the following steps: S1, adding aluminum salt into the carbonation leachate to remove silicon, and carrying out solid-liquid separation to obtain silicon-removed liquid; s2, mixing the silicon-removed liquid with ammonium salt, and performing solid-liquid separation after vanadium precipitation to obtain crude ammonium metavanadate; s3, re-dissolving the coarse ammonium metavanadate, carrying out stirring reaction on the obtained coarse ammonium metavanadate re-dissolved slurry, and carrying out solid-liquid separation to obtain an ammonium metavanadate solution; s4, a complexing agent and ammonium salt are added into the ammonium metavanadate solution for vanadium precipitation, and high-purity ammonium metavanadate is obtained after solid-liquid separation; and S5, carrying out high-temperature calcination on the high-purity ammonium metavanadate to obtain the high-purity vanadium pentoxide. According to the method provided by the invention, the high-purity vanadium pentoxide with low impurity content is obtained by adopting the technological means of deeply removing silicon, re-dissolving to remove iron and separating cations such as calcium, potassium, sodium and the like into the vanadium product through complexing crystallization, and the method is simple in technological process, low in auxiliary material consumption and relatively low in cost.

The invention provides a production method of a vanadium-aluminum alloy. The production method comprises the following steps: treating raw materials; the high-purity calcium fluoride is dried; lime and water are mixed according to the proportion of 1: 1, and the mixture is put into a drying box to be dried; the preparation method comprises the following steps: proportioning the following raw materials: vanadium pentoxide, aluminum powder and calcium fluoride according to the ratio of 1: (0.58-0.68): (0.02-0.13), proportioning the calcium fluoride according to the unit reaction heat of 3100-3150 KJ / kg, and uniformly mixing; filling the mixture into a reaction furnace body, compacting, and spreading an ignition agent on the material; ignition reaction; after the reaction is finished, standing the furnace body for 24 hours, moving out the furnace body, naturally cooling for 48 hours, and discharging from the furnace; the method mainly solves the problems of high alloy carbon content caused by graphite falling of the alloy graphite crucible and oxidation film and nitride film phenomena caused by metal solidification cracks.

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 discloses an electrolyte containing a redox medium as well as preparation and application of the electrolyte. The positive electrode electrolyte and the negative electrode electrolyte comprise tetravalent or trivalent vanadium ions, mixed acid, an iron ion additive and water, the iron ion additive is composed of iron phthalocyanine and a second iron-containing compound, and the second iron-containing compound comprises at least one of ferric acetylacetonate, heme iron and iron trifluoromethanesulfonate. The preparation method comprises the following steps: activating vanadium pentoxide in mixed acid, adding water to obtain a mixed solution, and adding a reducing agent into the mixed solution to react to obtain an initial mother solution; adding an iron ion additive into the initial mother solution, and uniformly mixing to obtain a positive electrode electrolyte; and electrolyzing the initial mother liquor to obtain electrolyte containing trivalent vanadium ions, adding an iron ion additive into the electrolyte, and uniformly mixing to obtain the negative electrode electrolyte. The charge-discharge polarization is reduced by using a small amount of iron ion additive containing iron phthalocyanine; the capacity fading caused by pentavalent vanadium precipitation is released; and the energy efficiency and the cycling stability of the battery are improved.

The invention discloses a high-temperature denitration catalyst used based on a garbage incinerator and a preparation process thereof, and relates to the technical field of catalysts, the high-temperature denitration catalyst comprises a catalyst, the catalyst takes anatase type titanium dioxide as a carrier and vanadium pentoxide and tungsten oxide as active components, nickel powder is added to prepare a mixed solution, and the mixed solution is used for dipping, calcining and forming the carrier. A large amount of nickel powder is added into an original catalyst for mixing, so that when the catalyst is in a garbage incinerator, the provided high-temperature condition drives nickel and oxides to react with water vapor, the existence of water in a catalyst environment is reduced, the reaction of SO2 and NH3 is improved, the conversion rate of NO is increased, and the conversion performance of the catalyst is improved.

The invention relates to the technical field of intermediate alloy metal materials, and provides a low-nitrogen vanadium-aluminum intermediate alloy and a preparation method thereof, and the low-nitrogen vanadium-aluminum intermediate alloy comprises the following components: 40-68 wt% of V, 0.001-0.003 wt% of N, and the balance of Al and inevitable impurities. The preparation method comprises the following steps: uniformly mixing raw materials of vanadium pentoxide powder and aluminum shots, charging the mixture into a furnace, carrying out exothermic smelting outside the furnace to obtain a vanadium-aluminum intermediate alloy semi-finished product, uniformly mixing potassium fluotitanate and nano carbon powder, putting the mixture as a grate-layer material at the bottom of a corundum crucible, charging the vanadium-aluminum intermediate alloy semi-finished product and the aluminum shots, and carrying out vacuum induction smelting, and the low-nitrogen vanadium-aluminum intermediate alloy is obtained. According to the preparation method provided by the invention, not only is the content of impurity nitrogen in the produced vanadium-aluminum intermediate alloy low, but also the production cost required by nitrogen removal is low.

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 provides ultrapure vanadium pentoxide and a preparation method thereof, and the preparation method of the ultrapure vanadium pentoxide comprises the following steps: mixing vanadium oxide and sulfur to obtain a vanadium solution, stirring and heating until the vanadium solution is completely dissolved, cooling and reacting, and filtering to obtain vanadium-containing crystals; dissolving the vanadium-containing crystal to obtain a vanadium-containing crystal solution, and adding an ammonium source, a complexing agent and an oxidizing agent to convert vanadium into anions so as to further obtain ultrapure AMV; and drying, dehydrating, oxidizing and calcining to obtain the ultrapure vanadium pentoxide. The purity of the prepared ultrapure vanadium pentoxide is larger than or equal to 99.99%, the content of each impurity element of K, Na, Ca and S is within 10 ppm, the content of other impurity elements is within 5 ppm, and the total impurity content in the vanadium pentoxide does not exceed 100 ppm. With the development of an all-vanadium redox flow battery technology, the ultra-pure vanadium pentoxide has good application prospects and large-scale industrial popularization potential in the field of high-purity vanadium reagents.

The invention relates to a method for preparing vanadium, chromium, aluminum and silicon products through gradient separation of vanadium shale. According to the technical scheme, silicon in the vanadium shale alkaline leaching solution is removed through a sulfuric acid precipitation method, and a desilicication solution and a siliceous precursor I are obtained; washing the siliceous precursor I with sulfuric acid, washing with water and calcining to obtain white carbon black; carrying out vanadium-chromium co-extraction on the desilicication liquid by adopting an amine extraction agent to obtain a vanadium-chromium organic phase; carrying out vanadium-aluminum extraction separation on the washing liquid by adopting an amine extraction agent to obtain a vanadium-rich organic phase and an aluminum-containing raffinate; the vanadium-rich organic phase and the vanadium-chromium organic phase are mixed, vanadium-chromium separation is achieved through step-by-step reverse extraction, and vanadium-rich liquid and chromium-rich liquid are obtained; adjusting the pH value of the aluminum-containing raffinate to precipitate aluminum hydroxide, and calcining to obtain aluminum oxide; carrying out ammonium salt vanadium precipitation on the vanadium-rich liquid to obtain ammonium polyvanadate, and calcining to obtain vanadium pentoxide; and reducing the chromium-rich liquid, adjusting the pH value, precipitating chromium hydroxide, and calcining to obtain chromium sesquioxide. The method is high in leaching rate, small in slag amount, high in product purity and high in recovery rate.