24 results about "Vanadium trioxide" patented technology

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

The invention provides a composite electrode material, a preparation method thereof and a battery. The composite electrode material comprises fibers interwoven into a network structure and an adhesion structure loaded on the surfaces of the fibers, the fibers are vanadium trioxide-carbon material fibers; the attachment structure is vanadium dodecahydrate, and the shape of the attachment structure comprises a petal shape and / or a wrinkle shape. The composite electrode material provided by the invention has abundant structural gaps, the electrochemical performance of the electrode can be effectively improved, the preparation method is simple to operate, and the obtained composite electrode material has good performance and wide application prospects.

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

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 provides a positive electrode active material for zinc-ion batteries, its preparation, and its application. First, carbon-coated nano-vanadium trioxide material is prepared. Then, the prepared carbon-coated nano-vanadium trioxide material is subjected to in-situ electrochemical activation. After activation, it is used in zinc-ion batteries. This invention activates inactive vanadium trioxide into high-valence vanadium oxide through in-situ electrochemical means, increasing a large number of oxygen vacancies and electrochemical activity, thus providing a positive electrode material for zinc-ion batteries with high specific capacity, ultra-high rate performance, low cost, and environmental friendliness.

This invention belongs to the technical field of sodium-ion battery electrode materials, specifically a mesoporous amorphous vanadium oxide-carbon composite electrode material, its preparation method, and its application. The composite electrode material of this invention has a micron-scale mesoporous structure with a specific surface area of ​​50-200 m². 2 g ‑1 The composite electrode material, with mesoporous pores of 10-20 nm, comprises highly amorphous vanadium trioxide and encapsulated carbon. Using a surfactant as a template agent and a carbon source as a coordinating agent, the vanadium source is coordinated in an aqueous solution, followed by drying and calcination to obtain the composite electrode material. This invention is the first to synthesize mesoporous amorphous vanadium trioxide material using a soft template method combined with a reducing carbon source. The preparation process is simple, easy to scale up, and highly controllable. As a sodium-ion battery anode material, it also possesses advantages such as high first-cycle coulombic efficiency, low operating voltage, excellent rate performance, and good cycle stability.

The invention discloses a method for improving vanadium yield in a vanadium-nitrogen alloy nitridation reduction process, which comprises the following steps: (1) uniformly mixing vanadium trioxide, ammonium polyvanadate, a carbonaceous reducing agent, iron powder, a binder and an auxiliary inhibitor in proportion to obtain a mixed material; (2) carrying out compression molding on the mixed material, and drying to obtain raw material balls; and (3) the raw material balls are subjected to a programmed heating nitridation reduction reaction in the nitrogen atmosphere, cooling is conducted after the reaction is finished, and the vanadium-nitrogen alloy is obtained. By controlling the ratio of vanadium trioxide to ammonium polyvanadate and designing a temperature programming curve matched with the reaction kinetics of the double-vanadium-source system, before the vanadium trioxide is subjected to violent carbon thermal reduction and volatile vanadium oxide is generated, the vanadium oxide is converted into the volatile vanadium oxide by utilizing the preferential decomposition and reaction of the ammonium polyvanadate; a protective layer for inhibiting vanadium volatilization is formed in material particles, and the vanadium recovery rate can reach 97% or above.

The invention discloses a preparation method of high-purity vanadium trioxide. The preparation method comprises the following steps: S1, weighing a high-purity ammonium metavanadate raw material; s2, the ammonium metavanadate raw material weighed in the step S1 is put into a rotary kiln, the temperature is rapidly increased to 180-250 DEG C, heat preservation is conducted for 1-3 hours, and the ammonium metavanadate raw material is dried; s3, introducing reducing gas into the rotary kiln, quickly heating to 450-550 DEG C, reacting, and calcining for 2-5 hours, so as to reduce the ammonium metavanadate into a vanadium trioxide product; s4, continuously introducing reducing gas, and cooling the vanadium trioxide product in the rotary kiln to 80-120 DEG C; and S5, taking out the vanadium trioxide product from the rotary kiln, rapidly cooling the product to below 40 DEG C, bagging the product, sealing and storing to obtain the high-purity vanadium trioxide product. The method has the characteristics of simple principle, convenience in operation, high product purity and the like, and the production efficiency of vanadium trioxide is remarkably improved.

The invention discloses a method for preparing vanadium trioxide based on ammonium polyvanadate and vanadium trioxide, and the method comprises the following steps: S1, pre-calcining and decomposing: uniformly laying ammonium polyvanadate in a calcining kiln, and calcining in an oxidizing atmosphere or inert atmosphere at 400-650 DEG C to obtain powdery vanadium pentoxide; s2, reduction: collecting the powdery vanadium pentoxide, feeding the powdery vanadium pentoxide into a reduction kiln, carrying out a reduction reaction in a reducing atmosphere at 600-800 DEG C, and keeping a solid-gas reaction state all the time in the reduction process to obtain vanadium trioxide powder; and S3, post-treatment is conducted, specifically, the reduced vanadium trioxide powder is cooled and sieved, and then a final product is obtained. According to the method, APV is converted into powdery V2O5 by introducing a pre-calcination decomposition procedure, and the powdery V2O5 is quickly reduced into a low-valence vanadium oxide with a high melting point after entering a reduction kiln, so that the possibility of ring formation of the reduction kiln is eliminated from the source, and the reduction reaction efficiency and the product purity are synchronously improved.

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.

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

The present application relates to the technical field of hydrometallurgy, and provides a method for preparing vanadium trioxide by using vanadium-containing leaching solution, in which the tetravalent vanadium in the vanadium-containing leaching solution is oxidized to pentavalent vanadium, then the pH value is adjusted to 4-6, and vanadium trioxide slurry is obtained through two reduction reactions; the vanadium trioxide slurry is subjected to wet magnetic separation, the tailing slurry obtained through the magnetic separation is subjected to solid-liquid separation and then dried to obtain vanadium trioxide. The present application greatly simplifies the preparation process of vanadium trioxide by using vanadium-containing leaching solution as raw material to carry out liquid-phase hydrogen reduction vanadium precipitation; the present application uses nickel powder and nickel sulfate as catalysts for catalysis in batches, which can effectively reduce the preparation cost of vanadium trioxide, and the vanadium precipitation product is easy to separate by magnetic separation, and the purity of the obtained vanadium trioxide product is greater than or equal to 99.5%. In summary, the method provided by the present application has the advantages of short process, low cost and high product purity.

The application discloses a vanadium-based positive electrode material and a preparation method and application thereof. The vanadium-based positive electrode material comprises a nitrogen-doped carbon matrix, quantum dot-sized vanadium nitride and vanadium trioxide loaded on the nitrogen-doped carbon matrix, a non-homogeneous interface is formed between the nitrogen-doped carbon matrix and the quantum dots, a heterojunction is formed between the quantum dot-sized vanadium nitride and the quantum dot-sized vanadium trioxide, and the nitrogen-doped carbon matrix is formed by calcining melamine. The preparation method comprises the following steps: adding ammonium metavanadate and melamine in a molar ratio of 1:2-4 into a dimethyl sulfoxide aqueous solution, stirring, obtaining a homogeneous solid solution, centrifuging, drying, sintering at 555 DEG C-1555 DEG C for 1h-5h in an inert atmosphere, and naturally cooling to obtain the vanadium-based positive electrode material. The vanadium-based positive electrode material has abundant heterojunctions, the preparation process is simple, the conditions are easy to control, the vanadium-based positive electrode material has long cycle stability, high specific capacity and excellent rate performance when used as a positive electrode of a zinc ion battery, and the zinc ion storage performance is outstanding.

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 technology described herein enhances the security of non-terrestrial network links by integrating quantum key distribution into an optically transparent metasurface transcoder node with hardware-based polarization control. The metasurface, composed of unit cells of metal-insulator transition material (such as vanadium dioxide, vanadium trioxide, or vanadium pentoxide) leverages the dynamic tunability of the metal-insulator transition material to manipulate the polarization and phase of photons, as needed for quantum key distribution protocols. Hardware level integration ensures secure key distribution with minimal signal loss, enhancing the robustness and security of satellite-terrestrial communication. The system dynamically adjusts to environmental conditions, optimizing performance and ensuring high fidelity in quantum key exchange, thereby providing a robust solution for secure communication in non-terrestrial networks. The transcoder's use of quantum key distribution allows for real-time detection of eavesdropping attempts, as interception of the quantum key exchange alters the photons'quantum states, alerting the system to potential security breaches.

The application provides a vanadium slag cleaning vanadium extraction method and application thereof. The method comprises the following steps: mixing vanadium slag and sodium salt, sintering, adding roasting clinker, water, chromium removal mother liquor and impurity removal slag, leaching to obtain tailings and leaching liquor, removing impurities from the leaching liquor to obtain purified liquor, performing precipitation treatment on the purified liquor to obtain vanadium precipitation mother liquor and calcium vanadate; adding a first reducing agent to the vanadium precipitation mother liquor to obtain chromium hydroxide, calcining to obtain chromium sesquioxide; performing vanadium leaching on the calcium vanadate, carbon dioxide, crystallization mother liquor and calcination tail gas to obtain calcium salt and sodium vanadate solution, evaporating and crystallizing the sodium vanadate solution to obtain sodium metavanadate, performing high-temperature reduction on the sodium metavanadate, an auxiliary agent and a second reducing agent to obtain reduced clinker, and performing sodium removal on the reduced clinker, sodium bicarbonate mother liquor and water to obtain vanadium sesquioxide. The application successfully prepares chromium sesquioxide and vanadium sesquioxide products, and realizes high-value utilization of high-chromium vanadium slag.

The invention belongs to the technical field of chemical material synthesis, and particularly relates to a pure-phase vanadium trioxide material and a preparation method thereof. The preparation method comprises the following steps: (1) mixing vanadium pentoxide and citric acid monohydrate, and grinding; (2) accurately weighing a proper mass of the mixture powder, and pressing the mixture powder into round tablets; (3) the tablets are assembled in a heating cavity of heating equipment, and vacuumizing-inflating treatment is carried out; (4) under argon / nitrogen atmospheres with different air pressures, fixed heat treatment parameters are input, and rapid flash burning is conducted for 10-60 s; and (5) cooling, and collecting to obtain a black fluffy pure vanadium trioxide product. Based on the Joule heating flash burning technology, by accurately controlling the pressure of the reaction atmosphere, efficient conversion from a V2O3 precursor containing a VO2 impure phase to pure-phase V2O3 is achieved, and a high-quality vanadium trioxide material is provided for the fields of zinc ion batteries and the like.

The invention relates to the technical field of ferrovanadium smelting, and provides a ferrovanadium alloy smelting method which comprises the following steps: crushing and screening blocky foundry returns to obtain foundry returns with different size fractions; the pretreated foundry returns are divided into a first particle fraction and a second particle fraction according to the particle size, the particle size of the second particle fraction is larger than that of the first particle fraction, and vanadium pentoxide and the foundry returns of the first particle fraction are used for preparing a base material; preparing a main material from vanadium trioxide and the foundry returns of the second size fraction, pre-dividing the main material into a plurality of batches, and preparing a flux material; the method comprises the following steps: igniting the base material, and then carrying out the following operations in batches: firstly adding a flux material into a furnace, then adding a batch of main materials, and electrifying and heating until all batches of main materials are completely added; and after cooling, the furnace is disassembled to remove the vanadium-iron alloy. According to the technical scheme, speed increase and efficiency improvement of ferrovanadium smelting are achieved.

The invention discloses a method for preparing vanadium trioxide by utilizing a vanadate solution, which comprises the following steps: firstly, adding the vanadate solution into a high-pressure kettle, adjusting the pH value to 0-4, carrying out reduction reaction under the conditions of high temperature and hydrogen partial pressure to obtain vanadium precipitation slag, then roasting the vanadium precipitation slag in a reducing atmosphere to obtain vanadium roasting slag, and finally roasting the vanadium roasting slag to obtain vanadium trioxide. And the vanadium roasting slag is subjected to water leaching, solid-liquid separation and drying, and vanadium trioxide is obtained. According to the method, two-step reduction of wet precipitation and pyrogenic roasting is adopted, the problem that in the prior art, an expensive catalyst (such as PdCl2) needs to be added for reducing precipitation in a wet autoclave to improve the reducibility and efficiency of reducing gas is solved, and the production cost can be greatly reduced; the pyrogenic process roasting reduction reaction rate is high, the efficiency is greatly improved, and the vanadium trioxide product with high purity can be obtained only through simple water leaching of the vanadium slag obtained through roasting.

The application discloses a method for extracting vanadium and removing sodium from sodium vanadium liquid, and belongs to the field of vanadium oxide preparation. The method comprises the following steps: a: adding a vanadium increasing agent into the sodium vanadium liquid to adjust the sodium vanadium ratio, adding acid to adjust the pH value, and then adding ammonia-containing substance to adjust the ammonium vanadium ratio and the pH value, and after precipitation and solid-liquid separation, obtaining sodium ammonium vanadate precipitate and supernatant; b: passing carbon reduction gas into the sodium ammonium vanadate precipitate, and obtaining vanadium trioxide, sodium carbonate and ammonia-containing gas through reduction separation. The method uses sodium vanadium liquid as raw material, adds a vanadium increasing agent into the sodium vanadium liquid to increase the vanadium concentration, adjusts the pH value and adds ammonia-containing substance to realize the simultaneous extraction and removal of vanadium and sodium in the sodium vanadium liquid in the form of sodium ammonium vanadate, passes carbon reduction gas into the sodium ammonium vanadate to realize the effective separation of vanadium and sodium through reduction separation, and prepares high-purity vanadium trioxide product.

This invention belongs to the field of chemical material synthesis technology, specifically relating to a method for preparing vanadium trioxide. The preparation method includes the following steps: (1) mixing sodium vanadate and sodium silicate, and ball milling to obtain a mixed powder; (2) calcining the mixed powder at 350-500 degrees Celsius for 2-4 hours under a nitrogen atmosphere to obtain calcined clinker; (3) washing and drying the calcined clinker to obtain the final product, vanadium trioxide. This invention uses sodium silicate as a reducing agent to directly reduce sodium vanadate, thus reducing the H+ in the traditional vanadium trioxide preparation process. 2、 This method effectively replaces reducing gases such as CO, eliminating the hazards associated with using reducing gases as reducing agents. Furthermore, the method eliminates the ammonium salt precipitation process of traditional processes, greatly simplifying the entire vanadium trioxide preparation process. The amount of wastewater generated during material preparation is also significantly reduced.

The invention discloses a vanadium selenide / ferrous selenide heterogeneous composite material as well as a preparation method and application thereof, and relates to the technical field of electrochemical energy storage and conversion. The preparation method comprises the following steps: firstly, reducing vanadyl sulfate through high-temperature decomposition to obtain a vanadium trioxide nanosheet; then ferrous sulfate heptahydrate and thioacetamide are subjected to a hydrothermal reaction, and ferrous sulfide microspheres are prepared; and mixing the vanadium trioxide nanosheets with the ferrous sulfide microspheres, and selenizing at high temperature to prepare the vanadium selenide / ferrous selenide heterogeneous composite material with the vanadium selenide nanosheets covering the surfaces of the ferrous selenide microspheres. Through unique hierarchical structure design and interface engineering optimization, after the prepared vanadium selenide / ferrous selenide composite material is applied to the negative electrode of the sodium ion battery, the key problems that traditional vanadium selenide is easy to dissolve, volume is expanded and the like are expected to be solved, and the vanadium selenide / ferrous selenide composite material has the technical advantages of high capacity, long circulation, low-cost preparation and the like, and has industrial application potential.

The invention belongs to the technical field of hydrometallurgy, and relates to an ammonium polyvanadate reduction synergistic vanadium extraction method which comprises the following steps: adding a low-valence vanadium reducing agent into an ammonium polyvanadate alkaline solution under a first condition to reduce soluble high-valence chromium into low-valence chromium to obtain a first mixed solution; continuously introducing oxygen into the first mixed solution under a second condition to oxidize the low-valence vanadium into soluble high-valence vanadium to obtain a second mixed solution; adding a flocculating agent into the second mixed solution under a third condition to synergistically adsorb low-valence chromium and silicate ions in the second mixed solution to obtain a third mixed solution; and the third mixed solution is sequentially subjected to filtering, vanadium precipitation, secondary filtering, washing and calcination treatment, and a vanadium pentoxide product is obtained. According to the method, high-valence chromium is reduced through vanadium trioxide, then low-valence vanadium is oxidized and recycled in the same system, so that soluble high-valence vanadium and trivalent chromium easy to precipitate exist in the solution at the same time, then one-step impurity removal is conducted through flocculation, and the vanadium extraction step is greatly simplified.

This application discloses a carbon-coated vanadium-based composite material, its preparation method, and its application. The preparation method includes the following steps: S100, mixing a vanadium source, a carbon source, and an alkali metal salt in a liquid phase, and drying to obtain a vanadium-oxygen precursor; S200, calcining the vanadium-oxygen precursor at high temperature under an inert atmosphere to obtain a vanadium trioxide@carbon precursor doped with an alkali metal. The general chemical formula of the vanadium trioxide@carbon precursor is M. y In an electrolyte containing alkali metal ions and / or zinc ions, vanadium trioxide@carbon precursor is subjected to a first electrochemical oxidation treatment, a second electrochemical oxidation treatment, and a third electrochemical oxidation treatment, thereby converting the vanadium trioxide@carbon precursor into a carbon-coated vanadium-based composite material in situ. The carbon-coated vanadium-based composite material provided in this application improves stability and lifespan, exhibiting good capacity retention and rate performance when applied in batteries.