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

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.

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.

This invention relates to the field of metallurgical technology, and more particularly to a method for preparing vanadium nitride using a mixed reducing gas. The method includes: grinding vanadium trioxide uniformly and pressing it into vanadium pentoxide tablets; placing the tablets in an electric furnace; first heating to 500-700°C under a nitrogen atmosphere; then introducing a mixed gas of methane, hydrogen, and nitrogen and holding for 20 minutes; then further heating to 800-850°C and holding for 20 minutes to obtain high-purity vanadium trioxide; subsequently heating to 1050-1150°C and holding for 1-5 hours to obtain crude vanadium nitride; stopping the introduction of the reducing gas and holding at 1050-1150°C for 0-4 hours under a nitrogen atmosphere; and then cooling to room temperature to obtain high-quality vanadium nitride. The technical solution mentioned in this invention features a low-temperature, short-time, and simple-to-operate vanadium nitride preparation process, enabling its large-scale application. Simultaneously, the resulting products are carbon monoxide and hydrogen, both of which can be recycled, thus helping to reduce carbon emissions.

This invention relates to the field of lead-free gold metallic glaze preparation technology, and discloses a lead-free gold metallic glaze and its preparation process. The components and their mass parts in the metallic glaze are as follows: washed kaolin: 5-8 parts, calcined kaolin: 4-6 parts, quartz powder: 8-10 parts, wollastonite: 2-4 parts, calcined talc: 0-2 parts, calcined zinc oxide: 2-4 parts, albite: 58-60 parts, tungsten oxide: 3-5 parts, electrolytic manganese: 9-11 parts, copper oxide: 0-2 parts, nickel oxide: 0-2 parts, vanadium pentoxide: 1-3 parts. This invention uses albite, quartz, wollastonite, talc, and zinc oxide as flux and skeleton components, which not only provide high-temperature fluidity but also improve the glaze surface strength. The addition of vanadium pentoxide and nickel oxide enhances the stability of the metallic luster. The washed kaolin, as a glaze slurry suspending agent, allows the calcined kaolin to not only increase the initial melting temperature of the glaze but also reduce pinholes on the glaze surface.

The present invention provides a catalyst with improved toxicity resistance to ammonium-based sulfur oxides such as acidic ammonium sulfate, and a denitrification apparatus equipped with this catalyst. [Solution] The catalyst of this disclosure is a catalyst containing vanadium and manganese, wherein the mass ratio of manganese oxide converted to dimanganese trioxide to vanadium oxide converted to divanadium pentoxide is 0.179 to 1.52.

This application provides a method for selectively separating vanadium and chromium from chromium-vanadium slag leachate, relating to the field of solid waste recycling. The method includes: diluting a hydrophobic eutectic solvent with a diluent to obtain an extractant; mixing the extractant with the chromium-vanadium slag leachate, performing shake extraction, allowing the mixture to stand and separate phases to obtain a vanadium-loaded organic phase and a raffinate; washing and back-extracting the organic phase to obtain a vanadium-poor organic phase and a vanadium-rich back-extract; then subjecting the vanadium-rich back-extract to vanadium precipitation treatment and a first calcination to obtain vanadium pentoxide; the hydrophobic eutectic solvent is obtained by heating and stirring a mixture of a hydrogen bond donor and a hydrogen bond acceptor, wherein the hydrogen bond acceptor is composed of a neutral phosphorus-containing organic compound and a hydrophobic quaternary ammonium salt. This method can achieve selective separation of vanadium and chromium, effectively solving the problem of vanadium and chromium separation from chromium-vanadium slag leachate, and has good application prospects in the field of selective separation of vanadium and chromium to prepare high-purity vanadium and chromium products.

Embodiments herein disclose a high-performance Vanadia-based catalyst designed for the efficient oxidation of sulfur dioxide (SO₂) to sulfur trioxide (SO₃) at significantly lower operating temperatures, with optimal performance around 400°C, a temperature lower than traditionally required by conventional catalysts. The catalyst consists of vanadium pentoxide (V₂O₅) as the active component, supported on naturally occurring uncalcined diatomaceous earth, combined with alkali metal promoters. A unique feature of the support material is the use of a mixture of relatively soft diatomaceous earth, exhibiting a percentage reduction of at least 35% in D50 particle size when measured by dry versus wet methods, alongside relatively hard diatomaceous earth to enhance mechanical strength. The catalyst demonstrates SO₂ conversion rates of 50-57% at 400°C and reaches a maximum of 80% at 410°C, surpassing benchmark catalysts that require higher temperatures (around 420°C) for similar conversions.

This invention relates to the field of zinc-ion battery technology, and more particularly to a zinc-ion battery using vanadium pentoxide as the positive electrode material and its activation method. The activation method for a zinc-ion battery using vanadium pentoxide as the positive electrode material involves charging and discharging the battery at a temperature of 50-70°C. This invention performs a long-cycle rapid activation process in an oven at 50-70°C, altering the interlayer structure of vanadium pentoxide, thus expanding the interlayer spacing. This allows the vanadium pentoxide to exhibit an initial discharge specific capacity of 335 mAh / g in just two cycles at a current density of 0.2 A / g. This invention has advantages such as short reaction time, rapid capacity increase, and stable performance. When applied to the preparation of positive electrode materials for aqueous zinc-ion batteries, it can significantly improve production efficiency and material performance.

The application discloses a preparation method of a vanadium pentoxide nanobelt with adjustable layer spacing. The method can control the morphology, crystallinity and layer spacing of the vanadium pentoxide nanobelt by controlling parameters such as solution concentration, ultrasonic temperature and ultrasonic time. The preparation method is simple in process, low in cost and suitable for industrial production.

The application discloses a method for separating vanadium and chromium elements from vanadium slag, which comprises the following steps: (1) roasting the vanadium slag with sodium carbonate, mixing and roasting the vanadium slag and the sodium carbonate at a certain temperature to convert vanadium and chromium elements in different valence states in the vanadium slag into the highest valence state; (2) low-temperature leaching, leaching the roasting product obtained in the first step with calcium salt and water at low temperature to obtain a calcium chromate crude liquid and a calcium vanadate leaching residue; (3) acid leaching and vanadium precipitation, separating residual chromium in the calcium vanadate leaching residue to obtain a vanadium-containing filter cake; (4) preparing vanadium pentoxide, adding water to the filter cake obtained in the third step, adding NaOH and (NH4)2SO4 to adjust the pH, and then performing water bath heating to obtain polyvanadic acid ammonium precipitate, which is dried and calcined to obtain V2O5 powder; and (5) preparing chromium trioxide, adjusting the pH of the chromium solution obtained in the second step, adding Na2SO3, reducing Cr 6+ to Cr 3+ , combining Cr 3+ with OH ‑ to form Cr(OH)3 precipitate, filtering, and calcining to obtain Cr2O3.

The present application relates to the technical field of catalyst, in particular to a vanadium-based catalyst for conversion of sulfur dioxide in waste acid treatment and a preparation method thereof, the vanadium-based catalyst comprises vanadium pentoxide, potassium sulfate, sodium sulfate, an auxiliary agent, a low-temperature promoter and a carrier, wherein the carrier is functionally modified diatomite, the vanadium-based catalyst prepared by the present application has high activity, high stability and strong anti-pulverization, and has excellent applicability in the conversion process of sulfur dioxide in waste acid treatment.

The application belongs to the field of phosphate inorganic material preparation, and relates to a method for preparing titanium-vanadium doped iron phosphate, which comprises the following steps: adding titanium and / or vanadium compounds into an iron phosphate complex solution to prepare an iron phosphate complex solution containing titanium and / or vanadium doped metal compounds, and then adding water into the mixed solution and heating to obtain titanium and / or vanadium ion doped iron phosphate; the titanium compound is selected from metatitanic acid, nano titanium dioxide, titanyl sulfate, titanyl oxalate, titanium citrate, titanium lactate or titanium tartrate; the vanadium compound is vanadium trioxide, vanadium dioxide (IV), vanadium pentoxide, vanadium monoxide, vanadium sulfate or vanadium trichloride. In addition, alternative solutions of adding sequence and adding timing change are provided. The application has simple process, is suitable for large-scale industrial production, and improves the electrochemical performance of lithium iron phosphate material in a power battery.

This utility model relates to the field of vanadium pentoxide purification technology and discloses a vanadium pentoxide purification device, including a mounting frame. A stirring tank is fixedly mounted on the upper surface of the mounting frame, a grinding box is mounted on the upper part of the stirring tank, a motor is fixedly mounted on the lower part of the mounting plate, a rotating rod is rotatably mounted inside the stirring tank, a connecting plate is provided on the inner wall of the bottom of the grinding box, a rotating column is fixedly mounted on the upper part of the grinding disc, a connecting plate is fixedly mounted on the outer side of the rotating column, a rotating block is fixedly mounted on the end of the connecting plate near the inner wall of the feed inlet, a pressurized water pump is fixedly mounted on the upper part of the mounting frame, and a water outlet is opened at the lower part of the rotating block. Through the arrangement of the grinding box, motor, rotating rod, grinding disc, rotating column, connecting plate, rotating block, pressurized water pump, sealing cap, water inlet channel, and water outlet, the raw materials can be stirred to prevent blockage, and the grinding disc and grinding box can be cleaned, thereby improving the grinding effect and increasing work efficiency.

The application discloses a preparation method of high-stability vanadium-aluminum alloy. The preparation method comprises the following steps: using vanadium pentoxide and aluminum particles with a particle size less than 3 mm as raw materials; uniformly mixing the vanadium pentoxide, the aluminum particles and a slagging agent to obtain furnace charges; loading the furnace charges into a reaction furnace body, adding an ignition agent, igniting and igniting, and generating an aluminothermic reduction reaction; when there is no open fire in the furnace, inert gas is introduced into the reaction furnace body for protection, and natural cooling is performed for 3-7 hours; when the alloy ingot in the furnace is naturally cooled to 800-1200 DEG C, the alloy ingot is taken out for water quenching treatment until the center temperature of the alloy ingot is reduced to below 50 DEG C. The technical scheme adopted by the application can effectively release thermal stress and inhibit the growth of brittle phase, the inert gas is isolated from oxygen from the source, and the cracking and oxidation are simultaneously inhibited; the overall cooling cycle is shortened, the production efficiency is significantly improved, and no complex and expensive equipment is needed, so that the energy consumption and production cost are greatly reduced.

This invention discloses an intercalated vanadium pentoxide cathode material, its preparation method, and its applications, relating to the field of secondary battery technology. This invention pre-embeds phenyltrimethylammonium salt ions as organic cations into the V₂O₅ interlayer, simultaneously achieving a triple regulation of rigid support locking the interlayer spacing, charge shielding to weaken electrostatic effects, and surface adsorption layer inhibiting vanadium dissolution, which is beneficial for improving the electrochemical magnesium storage performance of the electrode.

The present application provides a kind of vanadium phosphorus oxygen catalyst, it has the following weight composition components: vanadyl pyrophosphate 66-94%, vanadyl phosphate 0.5-6%, attapulgite 0.8-25%, graphite 1-6%.Prepared by the following method: organic solvent, vanadium pentoxide and phosphoric acid are mixed to react, obtain blue slurry reaction liquid containing vanadium phosphorus oxygen catalyst precursor, wherein attapulgite carrier is added, then after filtration, drying, shaping, calcination, activation and other steps, the catalyst is obtained.The catalyst of the present application is applied to n-butane oxidation reaction for maleic anhydride, in the reaction temperature interval of 380-420 DEG C, n-butane conversion and maleic anhydride yield are higher than that of catalyst without adding attapulgite.

This invention relates to the technical field of vanadium-nitrogen alloy production methods, specifically to a method for preparing vanadium-nitrogen alloys based on a mixed raw material of vanadium trioxide and vanadium pentoxide. The method proposed in this invention includes the following steps: mixing vanadium pentoxide and vanadium trioxide in a predetermined ratio and processing to a particle size ≤200 mesh to obtain mixed vanadium oxides; adding a catalyst, reducing agent, and binder to the mixed vanadium oxides and mixing again to obtain a mixture; pressing the mixture into shape and drying it to obtain raw material pellets; placing the raw material pellets in a pusher-type tunnel kiln and performing a segmented temperature-controlled reduction nitriding reaction under a nitrogen atmosphere; and cooling to obtain the vanadium-nitrogen alloy product. Through the above method, this invention effectively solves the technical problems of high energy consumption and low nitriding efficiency in the single vanadium pentoxide process, and high cost and limited supply in the single vanadium trioxide process.

The application discloses an inorganic-organic intercalation vanadium-based positive electrode material for a zinc ion battery and a preparation method thereof, and relates to the technical field of zinc ion batteries. The preparation method comprises the following steps: mixing vanadium pentoxide, an H2O2 solution, a sodium salt and water to obtain a solution A; dissolving benzyltrimethylammonium chloride in water to obtain a solution B; and mixing the solution A and the solution B and performing a hydrothermal reaction to obtain the inorganic-organic intercalation vanadium-based positive electrode material for the zinc ion battery. The application has the advantages of mild reaction conditions, a simple preparation process, low equipment requirements and industrial feasibility. The inorganic-organic intercalation vanadium-based positive electrode material has a nanoflower-like micro-morphology, high discharge specific capacity and excellent electrochemical performances such as excellent cycle stability.

The application specifically relates to a method for analyzing the content of impurity elements in a neodymium iron boron material by a fusion sample preparation-X-ray fluorescence spectrometry, and belongs to the technical field of analytical chemistry and material detection. The method comprises the following steps: after grinding, a sample is pre-fused in a platinum-gold crucible by using anhydrous lithium tetraborate to form a protective layer; lithium carbonate is added as an oxidant and vanadium pentoxide is added as an internal standard, and after pre-oxidation in stages, the sample is high-temperature fused to prepare a glass sheet; under optimized instrument conditions, a working curve is established by using a series of standard fusion sheets, a to-be-measured fusion sheet is measured, and the content of each element is calculated. Through the synergistic technology of the "flux protective layer-dry pre-oxidation-internal standard correction", two major problems of corrosion of active metals on the crucible and correction of the complex matrix effect are solved, and 10 kinds of elements such as Al, Cu, Co, Ga, Dy and Tb can be simultaneously and accurately measured. The method is safe in operation, high in efficiency and good in reproducibility, and is suitable for quality control and composition analysis of a neodymium iron boron permanent magnet material.

The application discloses a methanethiol synthesis catalyst with a wide hydrogen sulfide to methanol ratio and a preparation method thereof. The catalyst comprises the following components in parts of mass: 1-10 parts of magnesium oxide, 60-80 parts of aluminum oxide, 10-25 parts of potassium tungstate and 2-10 parts of vanadium pentoxide. The catalyst can keep high activity, high selectivity and long service life in a wide methanethiol ratio range, and has wide application value.

The present application relates to a kind of low-silicon low-iron flaky vanadium pentoxide preparation method, comprising: (1) after the pretreated vanadium-containing raw material is mixed with sodium salt, sodium calcination treatment is carried out, and calcined clinker is obtained;(2) the calcined clinker is treated with water leaching vanadium, and vanadium-containing crude liquid is obtained;(3) adding impurity-removing agent to the vanadium-containing crude liquid, and deep impurity-removing treatment is carried out, and purified vanadium liquid is obtained;The impurity-removing agent includes aluminum sulfate solution;The addition amount of the impurity-removing agent is 1.5-6% of the volume of the vanadium-containing crude liquid;(4) the purified vanadium liquid is sequentially treated with reduction and vanadium precipitation and calcination, and the low-silicon low-iron flaky vanadium pentoxide is obtained.The preparation method of the present application has the advantages of high impurity-removing efficiency, no impurity residue, strong process compatibility, controllable cost, and the vanadium recovery rate is ≥90%.

This application provides a method for preparing a rubidium salt-modified sulfur dioxide oxidation catalyst, comprising the following steps: S1, providing diatomaceous earth, silica, sodium sulfate, a forming agent, vanadium pentoxide, caustic alkali, silicate, and rubidium sulfate; S2, adding vanadium pentoxide and rubidium sulfate to an aqueous solution of caustic alkali, whereby vanadium pentoxide dissolves under alkaline conditions to form a soluble vanadate or metavanadate complex system, followed by adding an aqueous sulfuric acid solution to adjust the pH value, ensuring the vanadate system remains stable in the solution, and then adding silicate to obtain a first solution; S3, mixing diatomaceous earth, silica, sodium sulfate, and the forming agent uniformly to obtain a dry base material, adding it to the first solution and mixing, then kneading, shaping, drying, and calcining to obtain the finished catalyst. This application can improve the activity of vanadium catalysts at low temperatures and enhance the catalyst strength.

The application provides a vanadium pentoxide target material and a preparation method thereof. The preparation method comprises the following steps: ball-milling vanadium pentoxide powder and a dopant to obtain a mixed powder, and sequentially performing cold isostatic pressing, intermediate heat treatment, hot isostatic pressing and annealing on the mixed powder, and finally obtaining the vanadium pentoxide target material. The preparation method provided by the application realizes the preparation of a high-quality vanadium pentoxide target material through the combination of multiple pressure and heat treatment processes, and simultaneously realizes the improvement of the purity, density and uniformity of the vanadium pentoxide target material. The density of the target material reaches 99%, and the purity reaches 99.99%, which can greatly improve the quality of a vanadium pentoxide film.

A catalyst of the present disclosure contains vanadium and manganese, wherein the mass ratio of manganese oxide calculated in terms of dimanganese trioxide to vanadium oxide calculated in terms of divanadium pentoxide is 0.179-1.52.

This invention provides an amorphous vanadium-based cathode material, its preparation method, and its applications. The amorphous vanadium-based cathode material comprises active material glass powder, wherein the active material glass powder uses vanadium pentoxide as the active precursor, manganese dioxide as the structural stabilizer, sodium tetraborate decahydrate as the glass network former, lithium carbonate as the lithium source and network modifier, and thiourea as the reducing agent and nitrogen and sulfur doping source. The process employs melt quenching combined with thermoelectric coupling field crystallization, which is simple, low-cost, and suitable for large-scale production. Lithium-ion batteries assembled with this amorphous cathode material have advantages such as high specific capacity, excellent rate performance, and long cycle life.

This invention provides a method and system for hydrothermal-roasting coupled cascade separation and full-component resource recovery of vanadium-phosphorus iron, belonging to the field of resource utilization technology. The invention includes raw material pretreatment, hydrothermal pre-dephosphorization, low-temperature composite salt roasting for vanadium extraction, water leaching and vanadium recovery, and molten reduction alloying. This invention pioneers a coupling mechanism between "hydrothermal pre-dephosphorization" and "low-temperature composite salt roasting for vanadium extraction," and connects it with "molten reduction alloying," forming an inseparable cascade separation and full-scale recovery closed-loop system. Under mild conditions, it achieves a phosphorus removal rate exceeding 92% and a vanadium conversion rate exceeding 99%, reducing energy consumption by approximately 30% and solid waste emissions by more than 85% compared to traditional processes. It simultaneously produces three high-value products: high-purity vanadium pentoxide, agricultural phosphate, and stainless steel master alloy, possessing multiple advantages such as high resource utilization, clean and low-carbon operation, and significant economic benefits.

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

This invention provides a method for recovering vanadium, chromium, and sodium from a vanadium-chromium sodium salt solution: (1) Adjusting the pH value of the vanadium-chromium sodium salt solution, adding a chromium precipitation agent and performing a first hydrothermal reaction to obtain chromium hydroxide product and chromium precipitation mother liquor; sequentially performing a first washing and a first heat treatment on the chromium hydroxide product to obtain chromium oxide product; (2) Adjusting the pH value of the chromium precipitation mother liquor, adding a vanadium precipitation agent and performing a second hydrothermal reaction to obtain vanadium dioxide product and vanadium precipitation mother liquor; sequentially performing a second washing and a second heat treatment on the vanadium dioxide product to obtain vanadium pentoxide product; (3) Mixing the first washing residue from step (1), the second washing residue from step (2), and the vanadium precipitation mother liquor, and evaporating and crystallizing the resulting sodium-containing solution to obtain sodium carbonate product. This method avoids the introduction of sulfur and ammonia nitrogen from the source, generates no chromium-containing solid waste, and has a short process, clean process, and low energy consumption.