316 results about "Ammonium metavanadate" patented technology

The invention provides a method for preparing low-chromium low-potassium vanadium oxide by using a sodium vanadium solution, which comprises the following steps: S1) adjusting the pH value of the sodium vanadium solution to 10.5-11.0, and reacting with a chromium removal agent to obtain initial chromium removal slurry; s2) adjusting the pH value of the initial chromium removal slurry to 9.0-9.5, reacting with a silicon removal agent, and carrying out solid-liquid separation to obtain a filtrate; s3) reacting the filtrate with hydrogen peroxide, adding ammonium salt, precipitating vanadium, and performing solid-liquid separation to obtain ammonium metavanadate and primary vanadium precipitation wastewater; s4) adjusting the pH value of the primary vanadium precipitation wastewater to 6-7, reacting with ferrous sulfate, adding a complexing agent, mixing with the sodium vanadium solution, precipitating, and performing solid-liquid separation to obtain ammonium polyvanadate; and oxidizing and calcining the ammonium metavanadate to obtain the low-chromium low-potassium vanadium oxide. According to the method provided by the invention, the low-chromium and low-potassium vanadium oxide is prepared from the sodium vanadium solution, meanwhile, ammonium salt and vanadium in the primary vanadium precipitation wastewater are recycled, and the comprehensive production cost of the vanadium oxide is reduced.

The invention relates to a crystallization method of ammonium metavanadate crystals. The crystallization method comprises the following steps: cooling an ammonium metavanadate concentrated solution to obtain an ammonium metavanadate supersaturated solution; the cooling treatment process comprises the step of adding a crystallization regulating agent into the ammonium metavanadate concentrated solution; sequentially carrying out aging treatment and solid-liquid separation on the ammonium metavanadate supersaturated solution to obtain an ammonium metavanadate solid phase; by adding a crystallization regulating agent in the cooling treatment process, regulating the growth rate and growth direction of ammonium metavanadate crystals, matching with the steps of aging treatment and the like, the crystallization rate of the crystallization method is improved, preferably, the crystallization rate is up to 89.5% or above, and the high-purity ammonium metavanadate product with large grain size and regular morphology is obtained. Wherein the median particle size preferably reaches up to 86.5 microns or above, the purity reaches up to 99.97% or above, and the requirement for high-quality vanadium products at present is met.

The invention provides a method for preparing vanadium pentoxide from iron-containing ammonium metavanadate, which comprises the following steps: S1) mixing iron-containing ammonium metavanadate with water to obtain ammonium metavanadate slurry; s2) mixing the ammonium metavanadate slurry with a complexing agent, adjusting the pH value to 1.5-2.5, carrying out iron dissolving reaction, and carrying out solid-liquid separation to obtain ammonium polyvanadate; 3, ammonium polyvanadate is calcined, and vanadium pentoxide is obtained.According to the method for preparing vanadium pentoxide from iron-containing ammonium metavanadate, the technical thought of acid dissolution-complexing iron removal is provided, the content of iron in vanadium pentoxide is effectively reduced, the process is simple, and the process cost is low.

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 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 discloses a stone coal vanadium extraction method, and belongs to the technical field of stone coal vanadium extraction, and the method comprises the following steps: crushing stone coal vanadium ore, and simultaneously carrying out microwave irradiation to obtain an activated sample; immersing the activated sample and an oxidizing agent solution into an acid solution, heating and reacting to obtain a suspension, and carrying out solid-liquid separation to obtain a leachate; then, vanadium in the leachate is adsorbed and enriched through ion exchange resin containing quaternary ammonium groups, and an enriched vanadium solution is obtained through desorption with alkali liquor; then adjusting the pH value of the enriched vanadium liquid, adding an impurity removal agent, uniformly stirring, standing, and carrying out solid-liquid separation to obtain a purified liquid; finally, a precipitator is added into the purified liquid, solid-liquid separation is carried out after the reaction is completed, and the ammonium polyvanadate product is obtained.The method not only can remarkably reduce energy consumption, but also can effectively improve the purity of ammonium polyvanadate.

The invention provides a method for preparing high-purity vanadium pentoxide from carbonation leachate. The method comprises the following steps: S1) carrying out silicon removal on the carbonation leachate, and carrying out solid-liquid separation to obtain silicon-removed slag and silicon-removed liquid; s2) mixing the post-silicon-removal liquid with a complexing agent, and reacting to obtain a post-reaction liquid; s3) carrying out vanadium precipitation on the reacted liquid to obtain ammonium metavanadate and vanadium precipitation wastewater; s4) oxidizing and calcining the ammonium metavanadate to obtain high-purity vanadium pentoxide; the complexing agent is selected from one or more of ethylene diamine tetraacetic acid, disodium ethylene diamine tetraacetate and tetrasodium ethylene diamine tetraacetate. According to the method, the leaching solution obtained through the vanadium slag low-calcium roasting-carbonation leaching vanadium extraction technology serves as the raw material, ions such as iron, calcium and magnesium are controlled to enter the vanadium product through complexing, high-purity vanadium pentoxide with the low impurity content is obtained, the technological process is simple, implementation is easy, the cost is low, and the method is one of the methods for preparing high-purity vanadium pentoxide through the carbonation leaching solution.

The invention provides a method for closed-loop preparation of high-purity vanadium pentoxide from ammonium metavanadate, and belongs to the technical field of metallurgy. The method comprises the following steps: carrying out acid-process vanadium precipitation on an ammonium metavanadate raw material to obtain ammonium polyvanadate; carrying out alkaline vanadium precipitation on the ammonium polyvanadate to obtain high-purity ammonium metavanadate; and roasting the high-purity ammonium metavanadate to obtain the vanadium pentoxide. The existing method for producing high-purity vanadium pentoxide from ammonium metavanadate mainly adopts a pure alkali method or an acid method for purification, and has the problems of high purification cost, repeated purification, incapability of closed-loop production, low purity and the like, the acid-alkali combined secondary crystallization method is adopted, closed-loop production is realized, the cost is low, no pollution is caused, vanadium pentoxide with the purity of 99.9% can be obtained, the additional value is increased, and the method is suitable for industrial production. And the requirements of high-end vanadium markets are met.

The invention relates to a waste incineration fly ash harmless recycling method based on low temperature, and belongs to the technical field of fly ash harmless treatment.The fly ash harmless recycling method comprises the steps that fly ash, auxiliary materials and a catalyst are evenly mixed, and a mixture is obtained; the auxiliary material comprises phosphate; the catalyst is obtained by reacting a mixed system containing titanyl sulfate, ammonium metavanadate, sodium acetate and sodium isethionate; the mass ratio of titanyl sulfate to ammonium metavanadate to sodium acetate to sodium isethionate is 100: (0.5-3): (5-10): (3-6); and the mixture is subjected to mechanical alloying treatment, extrusion forming granulation and heat treatment, and a harmless recycling product is obtained. By means of the harmless recycling method for the fly ash, fixation of heavy metal and decomposition of dioxin at the low temperature can be achieved, the harmless recycling treatment process is high in efficiency and low in energy consumption, and the obtained harmless recycling product is lasting in heavy metal stabilizing effect, low in dioxin content and low in heavy metal leaching concentration.

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 belongs to the technical field of building glass and coating materials thereof, and discloses a one-step chemical synthesis method of W-VO2 (M) nano-particles and application of the W-VO2 (M) nano-particles in thermochromic smart windows.The method comprises the steps that firstly, ammonium metavanadate, hydrazine hydrate and ammonium metatungstate serve as raw materials, tungsten-doped M-phase vanadium dioxide nano-particles are chemically synthesized through a one-step hydrothermal method, and the tungsten-doped M-phase vanadium dioxide nano-particles are prepared; the obtained W-VO2 (M) nanoparticles are high in crystallinity, small in particle size (10-40nm), high in purity and low in phase change temperature; then, by taking a polyvinylpyrrolidone material as a parent material, uniformly distributing the W-VO2 (M) nanoparticles in PVP (Polyvinyl Pyrrolidone) to form a uniformly dispersed thin film; according to the application of the W-VO2 (M) nanoparticles in the thermochromic intelligent window, not only can high visible light transmittance be obtained, but also the solar energy regulation and control capability of the W-VO2 (M) nanoparticles can be improved, and the application of the W-VO2 (M) nanoparticles in the fields of the thermochromic intelligent window and radiation refrigeration is further promoted.

The invention discloses a vanadium-doped lithium manganese iron phosphate positive electrode material as well as a preparation method and application thereof. Secondary hydrothermal treatment is adopted, so that the particle size and the size of the material can be obviously controlled, short nanorod particles of lithium manganese iron phosphate grow into nanoparticles with the length smaller than 100 nm and the width smaller than 20 nm in an oriented mode, the diffusion size of Li < + > in the [010] direction is reduced, the diffusion path of Li < + > is shortened, meanwhile, ammonium metavanadate serves as a vanadium source to carry out Fe / Mn site substitution on the lithium manganese iron phosphate positive electrode material, and the lithium manganese iron phosphate positive electrode material is obtained. The preparation method has the advantages of reducing the dissolution behavior of manganese, increasing lattice defects, improving the lattice constant, carrying out double-layer modification of morphology and structure, ensuring the migration rate of Li < + > in the charge-discharge process, and realizing the improvement of the electrochemical performance of the lithium manganese iron phosphate positive electrode material.

The invention relates to a preparation method of oxygen vacancy-containing bismuth vanadate BiVO4-OVs or metal bismuth-loaded bismuth vanadate xBi0 / BiVO4. The preparation method comprises the following steps: weighing bismuth nitrate pentahydrate and ammonium metavanadate according to a molar ratio of bismuth nitrate pentahydrate to ammonium metavanadate of 1: 1 + x; the preparation method comprises the following steps: respectively dissolving bismuth nitrate pentahydrate and ammonium metavanadate in a solvent, fully mixing the bismuth nitrate pentahydrate and the ammonium metavanadate, adjusting the pH value of the solution, placing a reaction system in an environment of 140-180 DEG C for reaction, washing and drying a product, and roasting under the protection of argon to obtain the product. In addition, the invention also discloses an application of the bismuth vanadate BiVO4-OVs containing oxygen vacancies or the bismuth vanadate xBi0 / BiVO4 loaded with metal bismuth as a catalyst in preparation of benzaldehyde by photocatalytic oxygen oxidation of cinnamyl aldehyde. According to the method, the utilization rate of cinnamyl aldehyde can be increased, efficient oxidation can be achieved in the initial stage of reaction, good benzaldehyde selectivity can be achieved, and the adopted catalyst is efficient and non-toxic and has no influence on the naturalness of benzaldehyde.

The invention discloses a method for removing chromium in ammonium polyvanadate through reduction precipitation, according to the method, the effect of efficient chromium removal can be achieved only through simple dissolution and chemical precipitation methods, the chromium content of a product is smaller than 300 ppm, and the requirement for the content of impurity elements is avoided; the method is high in chromium removal efficiency, low in energy loss, high in vanadium recovery rate, clean, environmentally friendly and suitable for industrial production; and the prepared high-purity ammonium metavanadate is relatively high in purity and low in impurity element content, and can meet the requirements on the purity of vanadium products in the aspects of electrolyte and aeronautical manufacturing.

The invention belongs to the technical field of trichlorosilane purification, and discloses an adsorbent for adsorbing phosphorus impurities in trichlorosilane and a preparation method and application thereof.The preparation method comprises the steps that activated carbon is immersed in a solution containing ammonium metavanadate and oxalic acid, ultrasonic treatment and drying are conducted, and a vanadium oxide / carbon material mixture is obtained; calcining the vanadium oxide / carbon material mixture, and performing reduction treatment to obtain the oxygen vacancy-rich activated carbon loaded vanadium oxide adsorbent. The activated carbon loaded vanadium oxide adsorbent rich in oxygen vacancies is prepared by using a dipping-calcining-reducing method, and phosphorus impurities are adsorbed and removed by using the interaction of the activated carbon loaded vanadium oxide adsorbent and PCl3. The active carbon loaded vanadium oxide adsorbent rich in oxygen vacancies interacts with PCl3, so that trace PCl3 can be efficiently removed.

The invention provides a method for short-process all-component echelon recovery of a waste hydrogenation catalyst, and relates to the field of solid waste treatment. The recovery method of the waste hydrogenation catalyst comprises the following steps: roasting the waste hydrogenation catalyst and sodium carbonate to obtain a roasted product; the roasted product is leached with water, and leaching liquid and leaching residues are obtained; extracting the leaching solution by using an extracting agent to obtain a vanadium-molybdenum-containing organic phase, sequentially carrying out reverse extraction treatment on the vanadium-molybdenum-containing organic phase by using a strong alkaline reverse extraction agent and a weak alkaline reverse extraction agent to obtain a vanadium reverse extraction solution and a molybdenum reverse extraction solution, and carrying out vanadium precipitation treatment on the vanadium reverse extraction solution to obtain ammonium metavanadate; acidizing the molybdenum strip liquor to precipitate molybdenum to obtain ammonium molybdate; carrying out sintering treatment on the leaching residues and alkaline substances, leaching obtained calcine with water to obtain water leaching residues and filtrate, and carrying out aluminum precipitation treatment on the filtrate to obtain aluminum hydroxide, aluminum oxide or pseudo-boehmite; and reducing and smelting the water leaching residues to obtain the ferro-nickel alloy. According to the invention, multi-element comprehensive recovery of all components of vanadium, molybdenum, nickel, aluminum and sulfur can be realized, and high-value utilization of all components of the waste hydrogenation catalyst is realized.

The invention relates to a preparation method of an aluminum alloy corrosion-resistant composite coating, and belongs to the technical field of aluminum alloy treatment. The method comprises the following steps: firstly, mixing sodium phosphate, sodium silicate, sodium fluoride, ammonium metavanadate, sodium molybdate and sodium hydroxide according to a specific proportion to prepare a micro-arc oxidation liquid medicine, and carrying out micro-arc oxidation treatment on a pretreated aluminum alloy to form a black micro-arc oxidation coating; then, potassium permanganate and hydrogen peroxide are used for treating the multi-walled carbon nanotubes, zinc elements are introduced into the carbon nanotubes, the carbon nanotubes and the graphene oxide are combined through ball milling treatment, meanwhile, a silane coupling agent KH560 is added, compatibility is further enhanced, and the composite filler is obtained. And the composite filler is mixed with water-based acrylic resin emulsion, water-based polyurethane emulsion and the like to prepare an electrophoretic coating, and the aluminum alloy subjected to micro-arc oxidation is subjected to electrophoretic deposition treatment to obtain the composite coating. The aluminum alloy corrosion-resistant composite coating prepared through the method has excellent absorbance and good corrosion resistance.

The invention discloses a preparation method of an ethane oxidative dehydrogenation supported catalyst. The catalyst is formed by supporting a transition metal oxide on the surface of an M1 catalyst, the preparation method of the M1 catalyst comprises the following steps: dissolving ammonium heptamolybdate tetrahydrate, ammonium metavanadate, telluric acid and a dispersing agent in deionized water to form a mixed solution; and adding an aqueous solution of niobium oxalate into the mixed solution within 15-50 minutes to form a suspension, aging, carrying out hydrothermal crystallization, drying, roasting, and removing the M2 phase to obtain the M1 catalyst. The pore structure and the specific surface area of the molybdenum-vanadium-tellurium-niobium catalyst can be improved by adding a dispersing agent in the preparation process of the M1 catalyst and limiting the time for adding an aqueous solution of niobium oxalate into a mixed solution, and through mutual cooperation of all steps and parameters, the pore structure and the specific surface area of the molybdenum-vanadium-tellurium-niobium catalyst can be improved; and then the transition metal oxide is loaded on the surface of the M1 catalyst for phase interface coupling, and the transition metal oxide and the M1 catalyst cooperate with each other, so that the catalytic performance of the loaded catalyst can be remarkably improved.

The invention provides a chlorine tungsten anion and cation co-doped sodium vanadium phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of energy materials. The positive electrode material is formed by doping V site with W < 4 + > ions and doping (PO4) 3 site with Cl <-> ions, the chemical formula of the positive electrode material is Na < 3-x > V < 2-x > W < x > (PO4) < 3-y > Cl3y / C, x is equal to 0.05, 0.1 and 0.15, and y is equal to 0.09, 0.12 and 0.15; according to the preparation method, ammonium metavanadate, sodium acetate and ammonium dihydrogen phosphate are taken as raw materials, tungsten disulfide and sodium chloride are taken as doping sources, citric acid monohydrate is taken as a chelating agent, and the chlorine tungsten anion and cation co-doped sodium vanadium phosphate electrode material is prepared by a solution gel method, so that the electronic conductivity is improved, and the rate capability and the cycling stability are improved; the preparation method has a good application prospect in sodium ion battery positive electrode materials.

The invention provides a long-circulation high-rate negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of negative electrode materials. Silicon powder, tin powder and graphene are compounded and subjected to carbon coating, a three-dimensional conductive network is constructed, volume expansion is relieved, and conductivity, cycling stability and rate capability are improved; tungsten oxide serves as an interface stabilizer to form a protective layer, side reaction is inhibited, interface impedance is reduced, and a conductive network is enhanced; metaphosphoric acid is decomposed to generate an inorganic phosphate protective film, and nitrogen-doped carbon generated by urea decomposition is combined, so that the interface stability and conductivity are remarkably improved, and the cycle life is remarkably prolonged; lithium carbide reacts with vinylidene fluoride to generate a lithium fluorocarbon additive, and lithium ions are released in stages to reduce the first lithium loss and stabilize an interface; a vanadium-based metal-organic framework prepared from ammonium metavanadate and terephthalic acid is combined with pre-embedded lithium and graphitized carbon coating, so that a lithium ion transmission path is optimized, and the performance of the lithium ion battery is improved. The synergistic modification measures improve the long cycle stability and high rate performance of the negative electrode material.

The present invention provides a method for producing a molybdenum-vanadium-aluminum-chromium alloy with high uniformity. The composition of the molybdenum-vanadium-aluminum-chromium alloy is as follows: Mo 25% - 28%, V 24% - 27%, Cr 28% - 31%, with the balance being Al, O ≤ 0.05%, C ≤ 0.05%, and the segregation of the main content being < 0.6%. It relates to the field of metallurgical technology. The technological steps are as follows: (1) Prepare an ammonium molybdate-ammonium dichromate-ammonium metavanadate precursor by hydrothermal method using sodium molybdate, sodium metavanadate, sodium dichromate, and ammonium chloride; (2) Perform high-temperature treatment on the precursor to obtain a MoO3 / V2O5 / CrO3 composite material; (3) Mix the MoO3 / V2O5 / CrO3 composite material, refined aluminum powder, and calcium oxide in proportion, load them into a furnace and ignite to undergo a thermite reaction to obtain a molybdenum-vanadium-aluminum-chromium alloy ingot. Compared with the molybdenum-vanadium-aluminum-chromium alloy produced by the traditional thermite method, the uniformity of the present invention is greatly improved, and it can be used for the production of titanium alloys such as TB2, TB9, TB15, and TB16.

The invention discloses a bismuth vanadate material for carbon dioxide electroreduction and a preparation method and application, and belongs to the technical field of carbon dioxide electroreduction.The method comprises the steps that bismuth salt is dissolved in a nitric acid aqueous solution, a surfactant is added, and a mixed solution A is obtained through a stirring reaction; dissolving ammonium metavanadate in a sodium hydroxide aqueous solution, adding a surfactant, and carrying out a stirring reaction to obtain a mixed solution B; and mixing the mixed solution A and the mixed solution B, adjusting the pH value to be neutral, and carrying out stirring reaction, hydrothermal reaction, washing, drying and calcination reaction to obtain the bismuth vanadate material for carbon dioxide electroreduction. The preparation method comprises the following steps: uniformly mixing bismuth salt and ammonium metavanadate with a surfactant respectively, and roasting through a hydrothermal method and a template effect of the surfactant to prepare the bismuth vanadate material with high specific surface area for electroreduction of carbon dioxide. In carbon dioxide electroreduction, the catalyst has catalytic performance of high activity, good stability and high selectivity and electrochemical performance of low overpotential and high current density.

The invention discloses a method for recovering metal molybdenum and tungsten in a waste hydrofining catalyst, which comprises the following three steps: pretreating a hydrogenation catalyst containing molybdenum and tungsten, preparing a leaching solution, and refining and extracting the metal molybdenum and tungsten, and comprises the following steps: sorting the waste catalyst containing molybdenum and tungsten to remove impurities such as porcelain balls and the like; the method comprises the following steps: carrying out ball-milling grinding, sodium modification oxygen-enriched roasting, water leaching, filtering, leaching, refining and the like, carrying out sodium modification roasting on the ground material in an alkaline medium to remove impurities such as deposited carbon, colloid and asphaltene in a catalyst pore channel, and then carrying out water leaching to separate organic matters; finally, efficient separation, extraction and recovery of diamond tungsten in the waste catalyst are achieved in the mode that vanadium is extracted firstly, then molybdenum is extracted and then tungsten is extracted, and an acid method total leaching technology is adopted, the recovery method protected by the invention is simple in technology, little in pollution and high in metal tungsten recovery rate, byproducts of ammonium metavanadate and nickel aluminum powder can be further separated in a gradient mode, and the method is suitable for industrial production. And nickel sulfate and aluminum hydroxide products are obtained.

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 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 discloses an anti-aging bronze powder pigment and a preparation method and application thereof in the technical field of bronze powder pigments, and the anti-aging bronze powder pigment takes copper-zinc alloy as a base material, and is sequentially connected with a composite chemical passivation layer, a functionalized organic-inorganic hybrid compact barrier layer and a surface super-hydrophobic layer through chemical bonding from inside to outside; wherein the composite chemical passivation layer is formed by treating a passivation solution containing phytic acid, ammonium metavanadate and sodium tungstate; the functionalized organic-inorganic hybrid compact barrier layer is constructed by a silane mixed solution containing 3-mercaptopropyltriethoxysilane, a reaction type ultraviolet light absorber Si-BP, a reaction type hindered amine light stabilizer Si-HALS and tetraethyl orthosilicate through a sol-gel process. Through the design of a multi-layer composite system, the aging resistance of the bronze powder is improved, and meanwhile, the optical decoration performance can be reserved to the maximum extent, so that the dual strict requirements of high-end outdoor applications such as automobile coatings on durability and visual texture can be met.

The invention discloses a preparation method of an ammonium ion intercalation hydrated layered vanadium oxide and application of the ammonium ion intercalation hydrated layered vanadium oxide in a rechargeable zinc ion battery, the chemical composition of the hydrated layered vanadium oxide is (NH4) 0.4 V2O5.nH2O, and n is 0.01-2. The preparation method comprises the following steps: firstly, dispersing pentavalent vanadium source compounds (vanadium pentoxide and ammonium metavanadate) and ammonium radical-containing inorganic matters (ammonia water, (NH4) 2SO4, NH4NO3 and NH4Cl) into a mixed solution of water and an organic solvent; adjusting the pH value of the mixed solution to 1-5 by using a proper amount of acid solution (hydrochloric acid, sulfuric acid and nitric acid) to obtain a precursor solution; reacting the precursor solution at 90 to 200 DEG C for 5 to 20 hours, wherein the preferable reaction temperature is 120 to 140 DEG C; the preferable reaction time is 5 to 10 hours; and centrifuging or filtering, washing and drying to obtain the vanadium-based oxide. The preparation method is mild in reaction condition and simple in process; the obtained ammonium ion intercalation hydrated layered vanadium oxide is used as a positive electrode material to be applied to a zinc ion battery for the first time, and shows excellent cycling stability.

The invention discloses a method for preparing high-purity ammonium metavanadate by efficiently removing silicon, which is characterized in that a multi-step method of combining flocculation impurity removal, electrophoresis enhanced impurity removal and ammonium metavanadate crystallization is utilized in the preparation method, and the steps cooperate with one another, so that the silicon content in ammonium metavanadate can be effectively reduced to be less than 200ppm, and the purpose of efficiently removing silicon is achieved; the high-purity ammonium metavanadate obtained by the preparation method is relatively high in purity, low in impurity element content and high in vanadium recovery rate, and can meet the requirements of vanadium product purity in the aspects of electrolyte and aeronautical manufacturing.

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.

The invention discloses a vanadium oxide nanosheet aggregate self-supporting electrode material and a preparation method thereof.The preparation method comprises the steps that 1, 0.5-1 g of ammonium metavanadate, 0.5-1 mg of oxalic acid and 0.1-0.4 g of mesoporous molecular sieve MCM-48 are taken and added into 20-40 mL of ultrapure water, full stirring is conducted, and a mixed solution is obtained; step 2, putting pretreated foamed nickel into the mixed solution in the step 1, putting the mixed solution into a reaction kettle, putting the reaction kettle into a drying oven, and carrying out hydrothermal reaction at 140-180 DEG C; 3, after the reaction is finished, the reaction kettle is naturally cooled to the room temperature, the foamed nickel is taken out, the foamed nickel is subjected to water washing and alcohol washing alternately, the foamed nickel is placed in air to be naturally aired after washing, and the uniform vanadium oxide nanosheets are obtained. The vanadium oxide nanosheet aggregate self-supporting electrode material is prepared by adopting a low-temperature one-step hydrothermal synthesis method, the vanadium oxide nanosheet aggregate self-supporting electrode material has a unique microstructure, namely a nanosheet with the thickness of 100-200nm, and the structure can greatly improve the electrochemical performance and catalytic performance of vanadium oxide serving as an electrocatalyst.