147results about "Vanadium oxides" patented technology

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

The invention belongs to the field of functional nano materials, and relates to a method for large-scale preparation of monoclinic phase vanadium dioxide nano powder, a heat insulation film and application of the heat insulation film, and large-scale preparation of the monoclinic phase vanadium dioxide nano powder is successfully achieved by combining a coprecipitation method with low-temperature calcination. The obtained product has excellent size uniformity (the average particle size is 65 + / -10 nm) and an adjustable phase change characteristic (61-68 DEG C). The polymer-based composite film prepared based on the nano powder shows excellent optical performance, and the method has the advantages of mild reaction conditions (less than or equal to 600 DEG C), controllable product morphology and phase transition temperature and the like, and provides a reliable solution for industrial production of nano functional materials for intelligent windows.

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 discloses a three-dimensional porous carbon encapsulated V2O5 carbon fiber electrode constructed by in-situ growth and a preparation method and application thereof, belongs to the technical field of aluminum ion battery positive electrode materials, and aims to solve the problems that the intercalation and deintercalation dynamics of AlCl4 in a polyacrylonitrile (Pan)-based carbon fiber is blocked due to disordered graphite structure, and the performance of the Pan-based carbon fiber is influenced. And the material cannot be used as an effective electrode material to be applied to an aluminum ion battery system. According to the preparation method, an in-situ growth technology is adopted, a three-dimensional porous carbon substrate is grown on the surface of carbon fiber, then an orthorhombic system vanadium pentoxide (V2O5) nano material which has high theoretical specific capacity and can realize large-current charging and discharging is packaged in the three-dimensional porous carbon substrate, and the V2O5-based carbon fiber electrode is prepared. According to the electrode, the electrostatic interaction between Al < 3 + > ions and crystal lattices is effectively relieved, the structural advantages of the carbon fibers and the energy storage performance of V2O5 are fully combined, the energy storage effect of the aluminum ion battery is remarkably improved, and a new effective scheme is provided for development of aluminum ion battery electrode materials.

A process produces high-purity vanadium chemicals from vanadium raw materials having high molybdenum contents. Molybdenum is selectively precipitated via vanadium from alkaline vanadate solutions using the following process steps: providing a molybdenum-containing alkaline vanadate solution, adding calcium hydroxide as a precipitant in portions while keeping the pH constant between 6 and 7 using acid, mixing the solution, solid-liquid separation of the resulting suspension, and further processing the low-molybdenum alkaline vanadate solution to produce a high-purity vanadium chemical having a molybdenum content of at most 500 ppm.

The invention provides a resource comprehensive utilization method of vanadium-containing steel slag and vanadium extraction tailings, and belongs to the technical field of application of metallurgical slag. Comprising the following steps: (1) proportioning raw materials; (2) low-temperature roasting pretreatment; (3) directionally extracting vanadium; (4) cleaning, reducing and extracting iron; (5) residues are functionally utilized; from the perspective of the whole scheme, all the steps are closely connected and have a synergistic effect. The raw material ratio and low-temperature roasting pretreatment lay a good foundation for subsequent directional vanadium extraction and clean reduction iron extraction, so that the vanadium and iron extraction is more efficient; and the residues obtained after vanadium extraction and iron extraction are subjected to functional utilization to prepare the light-weight insulating bricks, so that zero emission and resource utilization of the waste residues are realized. The method not only solves the environmental problem caused by accumulation of the vanadium-containing steel slag and the vanadium extraction tailings, but also has a good industrial application prospect by efficiently recovering vanadium and iron resources and preparing the light insulating brick with a high additional value.

This invention belongs to the field of microwave absorbing material preparation technology, and discloses a two-step partial oxidation method to improve the microwave absorption performance of MXene materials. By performing hydrothermal pre-oxidation and heat treatment on MXene materials, oxide nanoparticles are grown in situ on their surface, achieving controllable partial oxidation. The MXene matrix retains a two-dimensional layered structure, and a heterogeneous interface is formed between the oxide nanoparticles and the MXene matrix. This adjusts the conductivity, optimizes impedance matching, enhances interface polarization, improves microwave absorption performance, and provides high-temperature stability.

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

A lithium-ion battery anode material containing surface-coated disordered rocksalt lithium vanadium oxide is disclosed. The surface coating contains a species selected from the group consisting of carbon, a metal oxide, a metalloid oxide, a metal fluoride, a metalloid fluoride, a metal phosphate, a metalloid phosphate, and combinations thereof. Materials, designs, synthesis methods, and devices related to fast-charging lithium-ion batteries are provided. This invention fills a technology gap by providing anode materials with disordered rocksalt lithium vanadium oxides to achieve fast charging in 10 minutes or less, greater than 200 W·h / kg energy density, a lifetime of at least 10,000 cycles, and improved battery safety. Methods of making and using the optionally surface-coated disordered rocksalt lithium vanadium oxide are disclosed. Many experimental examples are included, demonstrating several remarkable attributes of this battery technology.

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

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

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

The invention discloses a green, environment-friendly and efficient vanadium extraction method, and relates to a roasting additive and a roasting process thereof, and the method is realized by the following steps: mixing vanadium slag and a calcium oxalate additive, roasting, and treating the roasted clinker with acid to obtain a vanadium ion-containing solution and low-solubility residues; and treating the vanadium-containing ion solution to obtain a vanadium product with high vanadium content. According to the method, vanadium in the vanadium slag can be efficiently and rapidly separated and purified, an existing vanadium extraction process is simplified, the yield of vanadium is increased, the temperature and time needed by roasting the vanadium slag through a traditional calcium method are reduced, the risk of percolation of vanadium extraction tailings through a traditional sodium method is reduced, and the problems that in the traditional vanadium slag vanadium extraction process, the vanadium extraction rate is low, energy consumption is high, and the process is complex are solved; no harmful waste is discharged in the whole process, and no hexavalent chromium leakage risk exists in the leached tailings. The method is simple in process, energy-saving, environment-friendly, high in operability and wide in application prospect.

The application provides a method for preparing an M-phase VO2 film by a light-assisted spray pyrolysis method and the M-phase VO2 film prepared by the method, and belongs to the field of nanometer materials. The method comprises the following steps: (1) preparing a vanadium dioxide spraying liquid: adding vanadium oxyacetonylacetone into anhydrous methanol, stirring and aging to obtain a vanadium dioxide spraying liquid with ultraviolet photosensitive properties; (2) preparing a vanadium dioxide film: introducing the vanadium dioxide spraying liquid in step (1) into an atomizer and spraying onto a substrate coated with a TiO2 anatase phase under ultraviolet light irradiation to obtain the M-phase VO2 film. The method enables vanadium ions to be chelated in the sol by stirring, and the vanadium dioxide spraying liquid has ultraviolet photosensitive properties. The purity of the VO2(M) film is improved by introducing a titanium dioxide transition layer, and the microstructure of the VO2(M) film is improved by ultraviolet light irradiation, thereby improving the visual transmittance and solar light regulation rate of the VO2(M) film.

The application provides a method for preparing 3.5-valence vanadyl sulfate electrolyte by reducing ammonium polyvanadate with a gas, which comprises the following steps: (1) ammonium polyvanadate is reduced and calcined by a reducing gas to obtain vanadium oxide; the vanadium oxide contains V4O7; the reducing gas comprises a mixed gas of NH3, CO and H2; (2) a mixed sulfuric acid solution and the vanadium oxide are subjected to a dissolution reaction, and vanadium adjustment is performed to obtain 3.5-valence vanadyl sulfate electrolyte. The process is simple and easy to implement, 3.5-valence vanadyl sulfate electrolyte product can be obtained from ammonium polyvanadate as raw material, the vanadium concentration is high, and the application prospect is wide.

A cathode active material according to embodiments of the present disclosure includes: lithium metal oxide particles; and a conductive coating that partially covers the surface of the lithium metal oxide particles and includes a plurality of conductive particles. The conductive coating includes a first pattern having an island shape and a second pattern having a chain shape. According to embodiments of the present disclosure, the cathode active material may be formed by stirring lithium metal oxide particles and conductive particles using a resonant mixer. According to embodiments of the present disclosure, a lithium secondary battery including the above-described cathode active material may be provided.

A synthesis method for fabricating a three-dimensional energy storage foam comprising: preparing a first solution by dissolving a pre-determined amount of a polyvinyl alcohol in a pre-heated water, obtaining a second solution by adding a pre-determined amount of a vanadium salt to the first solution, producing a colloid mixture by adding a graphene oxide mixture to the second solution, obtaining a graphene oxide / polyvinyl alcohol / vanadium oxide composite by heating the colloid mixture in a pre-determined temperature under a hydrothermal condition for a pre-determined heating time, and fabricating the three-dimensional energy storage foam by heating the graphene oxide / polyvinyl alcohol / vanadium oxide composite to remove the polyvinyl alcohol under a calcining condition such that a plurality of vanadium oxide with a formula of V2O3 is decorated between the graphene oxide layers. The produced three-dimensional energy storage foam is configured to use as a working electrode for electrochemical hydrogen storage.

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

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.

A vanadium oxide composite of the present disclosure includes: a particle including a vanadium oxide represented by a composition formula (1) Li3+x+aV1-xMxO4+a / 2; and an electrically conductive material at least partially coating a surface of the particle. In the composition formula (1), 0 < a < 1 and 0 ≤ x < 1 are satisfied, and M is at least one element selected from the group consisting of a tetravalent metal element and a tetravalent metalloid element.

The invention belongs to the technical field of gas sensor detection, and particularly relates to an EMC gas component prediction method based on a V2 / V2O5 / SnO2 sensor and GRU-Attention. The EMC gas component prediction method comprises the following steps: S1, preparing multiple layers of V2C MXene; s2, preparing a V2 / V2O5 / SnO2 composite material; s3, preparing a gas sensor; s4, measuring a resistance signal; and S5, establishing a GRU-Attention gas detection model. The V2C / V2O5 / SnO2 heterojunction gas-sensitive film is successfully synthesized, and the heterojunction provides a large number of adsorption and reaction sites for methyl ethyl carbonate molecules at a low temperature of 150 DEG C through a synergistic effect among high conductivity of V2C, excellent gas-sensitive characteristic of SnO2 and catalytic activity of V2O5; the sensor prepared by the invention has remarkably improved gas sensitive response, high response / recovery speed and low detection limit, and realizes efficient detection of EMC gas in a wide concentration range.

A vanadium oxide composite of the present disclosure includes: a particle including a vanadium oxide represented by a composition formula (1) Li3+x+aV1-xMxO4+a / 2; and an electrically conductive material at least partially coating a surface of the particle. In the composition formula (1), 0 < a < 1 and 0 ≤ x < 1 are satisfied, and M is at least one element selected from the group consisting of a tetravalent metal element and a tetravalent metalloid element. The vanadium oxide composite has an average particle size of 0.5 µm or more and 5.0 µm or less.

The present invention relates to a positive electrode active material capable of improving the performance of a lithium secondary battery, in which the positive electrode active material comprises: a lithium composite transition metal oxide simultaneously comprising a Li2MnO3 phase and a LiMO2 (where M is an element comprising Ni, Mn or a combination thereof) phase; and a coating layer comprising a compound composed of vanadium (V) and oxygen (O) on the lithium composite transition metal oxide, in which the lithium composite transition metal oxide has a composition represented by chemical formula 1 described in the present application, and the content of vanadium (V) contained in the coating layer is 90 ppm to 2500 ppm based on the total weight of the lithium composite transition metal oxide, and the content of oxygen (O) contained in the coating layer is 100 ppm to 200 ppm based on the total weight of the lithium composite transition metal oxide. The present invention also relates to a method for preparing the same, and a positive electrode and a lithium secondary battery comprising the same.

A preparation method of granular vanadium pentoxide comprises the following steps: (1) adding ammonium metavanadate into a mixed solvent, heating, stirring and dissolving to obtain a solution A; (2) adding ammonia water and sodium acetate into the solution A, removing impurities, and carrying out solid-liquid separation to obtain a vanadium-containing purified solution; (3) heating the vanadium-containing purified solution, carrying out gradient vanadium precipitation, and carrying out solid-liquid separation to obtain a vanadium precipitation mother solution and solid-phase ammonium polyvanadate; and (4) calcining the ammonium polyvanadate for deamination to obtain particle vanadium pentoxide. According to the invention, a mixed solvent of water, ethylene glycol and acetone is adopted to prepare vanadium pentoxide with uniform particle size and large particle size; sodium acetate is added in the impurity removal process, the molecular structure of the sodium acetate contains hydrophobic carbon chains, the sodium acetate is alkalescent in an aqueous solution, and granular vanadium pentoxide can be generated through catalysis; product particle size distribution is uniform; the vanadium pentoxide product with the purity larger than or equal to 99.99 wt% and the particle size larger than or equal to 150 micrometers is prepared, the particle size within the range of 180 micrometers to 200 micrometers is larger than or equal to 80%, and particle size distribution is uniform.

The present application belongs to the field of waste resource utilization and hydrometallurgy, and particularly relates to a method for preparing vanadium pentoxide by using organic amine flue gas desulfurization residue, which adopts melamine method flue gas desulfurization residue as a vanadium precipitation agent. Under acidic conditions, the organic amine flue gas desulfurization residue can react with vanadate to generate more stable organic amine vanadate precipitate. After filtration, the precipitate is high-temperature calcined to obtain high-purity powder vanadium pentoxide. Compared with the current ammonium sulfate salt vanadium precipitation method, the present application has higher precipitable vanadium concentration, low ammonia nitrogen concentration in wastewater, and no need for heating in the reaction process, and is an environmentally friendly and low-cost vanadium pentoxide preparation technology.

A vanadium oxide composite according to the present disclosure comprises: particles that contain vanadium oxide; and a conductive material that covers at least a portion of the surface of each of the particles. The coverage ratio of the conductive material on the surface of each of the particles is 30% or more. The vanadium oxide composite has an average particle diameter of 0.5 μm-5.0 μm.

The invention discloses a method for preparing high-purity vanadium pentoxide based on nano-filtration and membrane separation coupling. The method comprises the following steps: (1) carrying out ball milling and sieving on vanadium slag; mixing the ball-milled vanadium slag with a sodium hydroxide solution, and removing insoluble impurities to obtain a vanadium-containing solution; (2) adding ethoxylated fatty acid methyl ester into the vanadium-containing solution, and uniformly stirring to obtain a vanadium-containing mixed solution; pressurizing to enable the vanadium-containing mixed solution to pass through a nanofiltration membrane, and collecting a vanadium-containing concentrated solution; (3) adding ammonium sulfate into the vanadium-containing concentrated solution, and stirring to separate out precipitate to obtain a vanadium-containing solid; and (4) drying and calcining the vanadium-containing solid to obtain vanadium pentoxide. The purity of the obtained vanadium pentoxide is greater than or equal to 99.99%, and the recovery rate of vanadium is greater than or equal to 95.0%. The method is simple in technological process, the vanadium-containing solution is purified through a nano-filtration and membrane separation method, the separation process is simple and convenient, the separation efficiency is high, the production period can be shortened, the cost is reduced, and environmental pollution is reduced.

The invention discloses a method for preparing vanadium pentoxide from vanadium slag and vanadium pentoxide. The method comprises the following steps that the vanadium slag is subjected to roasting, clinker leaching and purification in sequence, and purified liquid is obtained; extracting the purified liquid by using a CO3 < 2-> and / or HCO3 <-> type extraction agent to obtain a vanadium-containing organic phase; the vanadium-containing organic phase is subjected to reverse extraction through a reverse extraction agent, and vanadium-containing reverse extraction liquid is obtained; adding ammonium salt into the vanadium-containing strip liquor, cooling and precipitating to obtain ammonium metavanadate; and calcining the ammonium metavanadate to obtain vanadium pentoxide. According to the scheme, the purification liquid is separated in an extraction mode to obtain the vanadium-containing organic phase, meanwhile, the vanadium-containing organic phase is subjected to reverse extraction of vanadium through the mixed solution of the sodium carbonate, the ammonium carbonate and the ammonia water, the stability of the vanadium-containing reverse extraction liquid is improved through introduction of the sodium carbonate, and the problem that when the vanadium is subjected to reverse extraction through the mixed solution of the ammonium salt and the ammonia water is solved. The problems of device wall scabbing, pipeline blockage and the like caused by crystallization and separation of ammonium metavanadate are solved.

This invention relates to a method for preparing nano metal oxides and its use. The preparation method involves reacting a low-purity initial alloy containing the target metal element M and Al / Zn with a heated concentrated alkaline solution. Under specific reaction conditions, the initial alloy undergoes intense hydrogen evolution and Al / Zn-removal reaction, resulting in nanoscale fragmentation, followed by shape and composition reconstruction to form nano M oxides. Through further post-treatment, crystalline nano M oxides or modified nano M oxides can be obtained. This method is simple, fast, cost-effective, and suitable for large-scale production. It enables the preparation of nano metal oxides with various crystallinities, which have promising applications in fields including composite materials, catalytic materials, ceramic materials, refractory materials, advanced electronic materials, battery materials, chromogenic materials, wave-absorbing materials, wastewater degradation materials, antimicrobial materials, coatings, pigments, thermal spray materials, and sensors.

The invention discloses a metal oxide embedded carbon nanotube nano flexoelectric material and a preparation method and application thereof, and the preparation method comprises the following steps: opening a carbon nanotube to obtain an opened carbon nanotube; mixing the open carbon nanotube, hydrolytic salt and water to obtain a hydrolytic salt carbon nanotube solution; carrying out vacuum filtration on the hydrolytic salt carbon nanotube solution, and drying to obtain a hydrolytic salt embedded carbon nanotube material; and carrying out annealing treatment on the hydrolyzed salt embedded carbon nanotube material to obtain the metal oxide embedded carbon nanotube nano flexoelectric material. According to the preparation method provided by the invention, the carbon nanotube confinement space is utilized, the preparation of the nanoscale built-in stress gradient flexural dielectric material is realized, the geometric necessary dislocation density is increased by utilizing the size effect, the flexoelectric effect is amplified, and the application of flexoelectricity in the aspects of organic matter catalytic degradation and energy collection is improved.