126 results about "Vanadium pentoxide dust" patented technology

The present invention relates generally to the production of a vanadium electrolyte, including a mixture of trivalent and tetravalent vanadium ions in a sulphuric acid solution, by the reactive dissolution of vanadium trioxide and vanadium pentoxide powders, the surface area and particle size characteristics being controlled for complete reaction to produce the desired ratio of V(III) to V(IV) ions in the solution. The solution may be suitable for direct use in the vanadium redox battery, or the solution can provide an electrolyte concentrate or slurry which can be reconstituted by the addition of water or sulphuric acid prior to use in the vanadium redox battery.

The invention discloses a preparation method and application of a carbon intercalation layer V2O3 nanometer material. The preparation method comprises the following steps of (1) adding vanadium pentoxide powder into an organic amine liquid, and uniformly stirring and mixing the powder; (2) transferring a mixed liquid to a reaction kettle for hydrothermal reaction; and (3) placing the obtained hybrid precursor in a furnace after drying, introducing an inert gas for carbonization to obtain a V2O3/C hybrid nanometer material. The V2O3/C hybrid nanometer material prepared by the method is uniform in morphology, and a carbon layer can be effectively dispersed in a nanometer substrate in the material. When the material is applied to a lithium ion battery or sodium ion battery negative electrode, the rate performance of a metal oxide used as an electrode material can be greatly improved, the volume energy density of the battery is improved, and the material has relatively large application prospect.

The invention relates to a preparation method of a vanadium electrolyte, which comprises the following steps: dissolving vanadium pentoxide powder in a concentrated sulfuric acid for activation, adding into deionized water, dissolving and filtering to obtain a pentavalent vanadium ion solution; carrying out electrolysis by using the pentavalent vanadium ion solution as a negative electrode electrolyte solution and a sulfuric acid solution as a positive electrode electrolyte solution to obtain a vanadium ion electrolyte in which the mol ratio of trivalent vanadium to tetravalent vanadium is 1:1, wherein the molar weights of the sulfuric acid in the positive electrode electrolyte solution and the sulfuric acid in the negative electrode electrolyte solution are equal; and adding an additive into the vanadium ion electrolyte, and dissolving to obtain the vanadium electrolyte, wherein the additive comprises a phosphorous compound, and the mass percent of the compound in the vanadium electrolyte is 0.5-1.5%. The preparation method provided by the invention does not influence the service life of the vanadium battery and electrolyte on the premise of enhancing the concentration and stability of the electrolyte.

A preparation method of copper vanadate for lithium-ion battery cathode material includes: dispersing cuprous oxide in ethanol solution, and stirring to obtain suspension A; adding vanadium pentoxide powder into hydrogen peroxide solution, and stirring to obtain solution B; dropwise adding the solution B into the suspension A, continuing to stir until the color of obtained solution turns from dark red to olive green, filtering, washing and drying to obtain powder; holding the powder at 200-400 DEG C for 0.1-2 h to obtain the copper vanadate for lithium-ion battery cathode material. Copper vanadate is material is generated directly based on cuprous oxide through in-situ topological reactions by using insoluble cuprous oxide as a template. The method is simple, has no need for complex equipment, enables preparation of a required material under normal temperature and normal pressure, and since the cuprous copper is used as a hard template, it is possible to control the shape of a product. In addition, the reaction time is short, product purity is high, the whole process flow is simple, and it is easy to implement industrialization.

The present invention discloses a preparation method of mullite porous ceramic with cluster-like whisker structure. The method is as below: dispersing aluminum hydroxide, silica, aluminum fluoride and vanadium pentoxide powder in a polyvinyl alcohol (PVA) aqueous solution; mixing evenly and freezing in a mold; separating PVA and water; crosslinking a PVA molecular chain, and curing the ceramic powder by the PVA molecular chain and ice; and then freeze-drying, batching and sintering to obtain the mullite porous ceramic with in-situ grown whiskers, porosity of 50%-90%, and compressive strength of 2-15 MPa. The present invention can be applied to the fields of muffler noise reduction, catalyst carrier and gas-solid separation.

The invention relates to a method for preparing a vanadium pentoxide/graphene composite aerogel material. The method comprises the following steps: firstly, evenly mixing vanadium pentoxide powder, benzyl alcohol and isopropyl alcohol, refluxing, condensing, and filtering to obtain vanadium pentoxide sol; evaporating and concentrating to obtain concentrated vanadium pentoxide sol; adding an aqueous dispersion of graphene oxide and a catalyst to the concentrated vanadium pentoxide gel; stirring and ageing, so as to obtain vanadium pentoxide/graphene composite wet gel; carrying out solvent replacement in replaced solvent; drying to obtain vanadium pentoxide/graphene composite aerogel; and carrying out thermal treatment, so as to obtain the vanadium pentoxide/graphene composite aerogel. Compared with the prior art, the method disclosed by the invention is simple and easy to achieve; and meanwhile, inorganic vanadium pentoxide powder is adopted as the raw material, so that the cost is relatively low; and popularization and application are facilitated; meanwhile, a metallic oxide is evenly compounded with graphene through in-situ growth; and a new way is provided for the preparation of metallic oxide/graphene composite aerogel.

The invention discloses a nano vanadium oxide and a preparation method thereof. The vanadium oxide is ribbon-shaped nano vanadium pentoxide of which the length, width and thickness are respectively 1-10mm, 30-200mm and 5-40nm, or nano vanadium oxide hydrate of which the length, width and thickness are respectively no more than 1mm, 80-480nm and 10-50nm, or nano B-phase vanadium dioxide of which the length, width and thickness are respectively 130-170mu m, 180-560nm and 20-50nm, or nano A-phase vanadium dioxide of which the length, width and thickness are respectively 80-120mu m, 0.5-5mu m and 200-450nm. The method comprises the following steps: melting vanadium pentoxide powder, and immersing in a quenching medium while stirring, thus obtaining vanadium pentoxide collosol; and performing hydrothermal reaction on the vanadium pentoxide collosol in a closed state to obtain the nano vanadium pentoxide, or adding polyethyleneglycol into the vanadium pentoxide collosol, and performing hydrothermal reaction in a closed state for different time periods to respectively obtain the nano vanadium oxide hydrate or the nano B-phase vanadium dioxide or the nano A-phase vanadium dioxide. The invention can be used in lithium ion batteries and super capacitors.

The invention relates to a preparation method of submicron-level vanadium trioxide powder. The preparation method comprises 1, preparing an oxalic acid solution, 2, heating the oxalic acid solution, adding vanadium pentoxide powder into the oxalic acid solution, and carrying out a stirring reaction process until complete dissolution to obtain a vanadyl oxalate solution, 3, slowly adding ammonium hydroxide into the vanadyl oxalate solution and carrying out stirring for a reaction to obtain precipitates, 4, filtering the precipitates and carrying out drying to obtain a high-activity precursor and 5, roasting the high-activity precursor in an inert atmosphere to obtain submicron-level vanadium trioxide powder. The submicron-level vanadium trioxide powder has high product purity and a single phase, contains submicron-level spherical particles with the uniform sizes less than 1 microns and high particle surface activity and is conducive to further processing and use. The preparation method has simple processes, can be operated easily, has a low cost, is free of hydrogen or other reducing atmospheres, has high safety and a low three waste treating capacity and can be easily industrialized.

The present invention discloses a method of producing lithium ion battery positive pole material fluorine Lithium Vanadium Phosphate by microwave rapid reaction. First evenly mix vanadic oxide powder, phosphates, organic acid, lithium salt and villaumite in molar ratio 0. 95-1.1:1.9-2.1:0.95-1.1:1. 9-2.1:1.9-2.1 respectively. Then sinter the mixture in a microwave reactor for 10 to 40 minutes in 450 EDG C to 750 EDG C under noble gas protection, and get completed product LiVPO4F after cooling. The invention is simple and convenient, easy controlled and cost low which simplifies the synthesizing process and improves charge-discharge performance and circulates performance of sample.

The invention discloses a method for growing a large-area mono-crystal vanadium dioxide thin film by utilizing a tubular furnace. The thin film grows on an experiment substrate with a certain thickness of SiO2/Si, Si3N4/Si, silicon, quartz, sapphires and the like by adopting a gas-solid manner. A growth surface of the experiment substrate is subjected to strict polishing treatment, and a reaction source vanadium pentaoxide powder is uniformly put at the bottom of a quartz boat; the experiment substrate is put into the quartz boat and the growth surface of the substrate is put downward. The large-area mono-crystal vanadium dioxide thin film is prepared through controlling a temperature rising speed, temperature, air pressure, gas flow size and reaction time in a vacuum environment of the tubular furnace. Compared with a common vanadium dioxide thin film, the large-area mono-crystal vanadium dioxide thin film prepared by the method has more excellent performances, the process is simple and the film forming quality is high; after the prepared mono-crystal vanadium dioxide thin film is subjected to insulator-metal phase change, the changing amplitude of the electrical conductivity reaches 4 to 5 orders of magnitude; the mono-crystal vanadium dioxide thin film is a mono-crystal material thin film and has wide application prospects in photo-electric, infrared and gas sensing aspects and the like.

The invention provides a method for preparing vanadium pentoxide by utilizing invalid vanadium battery positive pole electrolyte. The method comprises the following steps that the invalid vanadium battery positive pole electrolyte is led into a vanadium battery positive pole, charging pre-oxidation is performed to obtain electrolyte of pentavalent vanadium ions; evaporation and concentration are conducted on the electrolyte of pentavalent vanadium ions, and then standing is performed to form mixed liquid containing a pentavalent vanadium precipitate; the mixed liquid is filtered, and a filter cake is dried and grinded to obtain vanadium pentoxide powder. By the adoption of the method, recycle of vanadium electrolyte is achieved, and the produced vanadium pentoxide is high in purity and can be continuously used for preparing electrolyte and other purposes or used as a catalyst.

The invention relates to a wet process vanadium extraction technology of clay ore, providing a valuable metal technology for extracting vanadium by wet process from vanadium clay ore, which belongs to the non-ferrous metal metallurgical technology field. The invention is characterized in that disintegrating clay ore, proceeding thermostatic mixing acid leaching reaction as adding sulfuric acid, fluohydric acid and oxidation agent under certain liquid solid volumetric ratio, separating solid and liquid, removing out iron and aluminum and recycling to utilize after leaching solution being treated by multistep pH value regulation and alkali deposition solubilization reaction, depositing vanadium by ammonium salt after purified vanadium being regulated pH value, filtering, drying and calcining ammonium metavanadate which is prepared to obtain vanadium pentoxide powder. The invention directly leaches clay ore mixing with acid, has high acid leaching rate, lower energy consumption, short technical process, easy operation and control, low productive cost, environment-friendly and safety, realizes zero discharge in the production process, has no waste gas generation, and recycles waste water and valuable metal, and the recycle rate of vanadium reaches 70-75%, purity of vanadium pentoxide of the product is larger than 99%.

A preparation method of oxide photochemical catalyst prepared by composite oxide belongs to visible light catalysis field. The preparation process is: it dissolves bismuth nitrate containing crystal water into 2-2.5M nitrate, the mass concentration of bismuth nitrate is 7.4%--29.5%; dissolves metavanadate ammonium into 40-50DEG C hot water, the mass concentration of metavanadate ammonium is 1.8%-7.1%; mixes said two solution and adds surface activator into it, stirs it uniformly and adjusts it with aqua forties until the pH is 0-2; heats it in press-still and maintains temperature of 190-260DEG C, the reaction time is 30-50 hours; then cools it and sucks it, washes repeatedly with deionized water until the solution is colorless and clear, dries it. The preparation precess avoids using acute-toxic vanadic anhydride powder and precipitant, and no acute-toxic intermediate product is generated; the active of oxygen prepared by ultraviolet light and using the oxide photochemical catalyst can reach 40-90umol/h and the active of oxygen catalyzed by visible light is 70-355umol/h.

The invention belongs to the technical field of material chemistry and relates to an inorganic sol-gel preparation method of a vanadium dioxide film. The inorganic sol-gel preparation method comprises 1, dissolving vanadium powder or vanadic anhydride powder in hydrogen peroxide, carrying out stirring, carrying out standing, and carrying out room temperature preservation to obtain pentavalent vanadium sol, and 2, coating a substrate with the sol obtained by the step 1 and carrying out weak-reduction one-step annealing in an inert gas protective atmosphere to obtain the vanadium dioxide film. The one-step annealing method solves the problem that the existing pentavalent vanadium sol film preparation method needs hydrogen pre-reduction and a complicated two-step annealing process or harsh conditions of high-vacuum and high-temperature thermal decomposition, has an annealing temperature in a common glass bearing range, has low requirements on an annealing furnace and further reduces a cost. The vanadium dioxide film has excellent optical regulation and control performances, the highest visible light transmittance rate of 70%, the highest infrared adjusting performance of 60% and a wide application prospect in the field of a photoelectric functional material.

The invention discloses a method for rapid preparation of a vanadium-nitrogen alloy. The method comprises the following steps: S1, preparing ingredients: weighing and taking a vanadium pentoxide powder, a graphite powder, a sodium silicate aqueous solution and an iron powder for standby application; S2, pretreating: mixing evenly the above raw materials, pressing into oblate spheroids, and drying; S3, feeding: placing the dried oblate-spheroid material on a graphite material basket, sending into a vacuum furnace by a transfer device, sealing the vacuum furnace, and starting a vacuum pump; S4, carrying out vacuum nitridation sintering: allowing the temperature in the furnace to reach 1400-1500 DEG C in 5 hours, then stopping the vacuum pump, carrying out deep carbonation and nitridation reaction, and continuously filling nitrogen during the reaction; and S5, discharging: after vacuum treatment, continuing to fill the nitrogen, cutting off power, cooling the vacuum furnace, when the temperature is dropped to 190-210 DEG C, stopping supplying nitrogen, opening the furnace, and taking out the graphite material basket. The method has the advantages of simple operation, low production cost, accurate process control, fast preparation, low energy consumption, and stable product production; and the vanadium-nitrogen alloy prepared by the method is high in nitrogen content and low in impurity content.

The invention discloses a method for preparing a novel nano-material V10O24.12H2O. The method takes industrial vanadium pentoxide powders and peroxide as main raw materials, uses a sol-gel method, combines with a solvent replacement process and prepares a nano-porous material at normal pressures. The method comprises the following steps of: using the V2O5 powders and the peroxide to prepare the sol by a sol-gel method; sealing and storing the sol till gel is formed; ageing the gel and carrying out solvent replacing and drying at normal pressure. The method has the advantages of cheap and easily obtained raw materials, simple reaction process, moderate reaction conditions, etc. The method well makes up the shortcomings of preparing the V10O24.12H2O by the hydrolysis method and fusing method of organic vanadic salts, and leads the preparation of the material to tend to mature.

The invention discloses a method for producing high-purity vanadium pentoxide through titanium tetrachloride refined vanadium-removed tailings. The method includes the seven processes: pre-treatment (1), chlorination (2), dust removal (3), drip washing (4), distillation purification (5), oxidation powdering (6) and tailing oxidation dechlorination (7). According to the method, in the pre-treatmentprocess, the titanium tetrachloride refined vanadium-removed tailings are subjected to oxidation dechlorination to obtain corresponding oxidized slag and circulating chlorine gas; in the process of feeding the oxidized slag into chlorination, selective chlorination of vanadium oxide is achieved, and chlorinated flue gas and chlorinated slag are obtained; the chlorinated flue gas is subjected to the processes of dust removal, drip washing and distillation purification, and high-purity vanadium oxytrichloride is obtained; and high-purity vanadium pentoxide powder is obtained from the high-purity vanadium oxytrichloride under action of oxygen-rich air and a catalyst. The method is suitable for treatment of the vanadium-removed tailings, and has the advantages of high raw material adaptability, good selectivity, low reaction temperature, chlorine gas recycling, energy saving and consumption reduction, environmental friendliness, high product additional value and the like.

The invention discloses a method for preparing anode material vanadium lithium phosphate of a lithium-ion cell at low temperature, comprising the steps of: (1) heating vanadic oxide powder to six hundred to nine hundred DEG C; allowing to melt at a constant temperature for one to four hours and pouring into a container with water rapidly to form a brown-red solution; letting the solution stand for four to sixteen hours to form wet gel V2O5.nH2O; washing the wet gel, removing most of moisture, keeping drying for four to sixteen hours in a vacuum ambient of seventy to one hundred DEG C and grinding to obtain vanadic oxide powder. (2) Mixing the vanadic oxide powder obtained through the preparation method with lithium, phosphates and acetylene black evenly at mol ratio of one to three to three to three point six, sintering for ten to forty hours at temperature between four hundred to seven hundred DEG C under the protection of an inert gas and cooling to obtain a finished product of Li3V2 (PO4)3.The preparation method solves the problem that vanadium ion is easy to be oxidized, reduces sintering temperature and cost, improves the charging and discharging performance and cycle performance of samples.

The invention discloses a method for producing vanadium pentoxide by microwave calcinations of ammonium metavanadate. The ammonium metavanadate and vanadium pentoxide powder are packed in a microwave reactor after drying respectively, wherein the weight of the vanadium pentoxide is 10 to 50 percent of the total weight; the microwave frequency is 2.45GHz; the power is 0 to 80kW; the calcining temperature is between 50 and 550DEG C; the time is 5 to 30 minutes; and the purity of the calcined products is 98.5 weight percent.

The invention discloses a method for preparing lithium ion battery anode material vanadium lithium phosphoric acid by a sol-gel method. The method of the invention comprises the following steps: the vanadium pentoxide powder is heated to 600-900 DEG C and the temperature is kept for 1-4 hours till the power is melted; the melted powder is rapidly dumped into a container with water to form a brownish red solution; subsequently, lithium salt, phosphate and organic acid are added into the solution; the solution is uniformly mixed and then sintered for 5-20 hours under the protection of inert gas so as to form a finished product LI3V2(PO4)3 after being cooled. The method of the invention solves the problem that the vanadium ion is easy to be oxidated, the sintering temperature and the cost are reduced, and the charging and discharging performance and the circulation performance of the samples are improved.

The present invention discloses a system and a method for producing powdery vanadium by using a chlorination process. According to the present invention, through fluidized bed oxidative granulation treatment, the mineral phase reforming and the mineral particle growth of the vanadium residue are achieved; through calcium fixing treatment with carbon dioxide, the decalcification of the vanadium residue is achieved; the vanadium in the vanadium residue is converted into gaseous vanadium oxytrichloride through selective chlorination, and most of impurities such as iron, manganese, phosphorus, titanium, silicon and the like are remained in the chlorinated residue so as to effectively separate vanadium and other impurities; the gaseous vanadium oxytrichloride is sequentially subjected to dust removal, leaching, settlement, rectification purification, catalytic oxidation and other processes to prepare the high-purity vanadium pentoxide powder (powdery vanadium); the chlorinated residue is subjected to gas phase hydrolysis dechlorination treatment, and the dechlorination residue returns to iron making; and with the system and the method, the clean comprehensive utilization of vanadium residue is achieved while the sensible heat of the high temperature flue gas of the chlorination furnace is effectively utilized so as to achieve the purposes of energy saving and consumption reduction.

The present invention relates to a hexagonal vanadium pentoxide nano-material as well as a preparation method and an application thereof. The vanadium pentoxide nano-material is hexagonal, and the thickness of each angle is about 100-300 nm. The preparation method comprises the following steps: using vanadium pentoxide powder, benzyl alcohol, and isopropanol as raw materials, preparing vanadium oxide collosol through reflux condensation and distillation concentration, mixing the collosol, ethanol and deionized water to obtain a vanadium pentoxide nano-material through a hydrothermal reaction and post sintering treatment. The prepared vanadium pentoxide nano-material is extremely suitable for an anode material of lithium-ion batteries. Compared with the prior art, the nano-material has the advantages of simple process, low manufacturing costs and excellent electrochemical performance and the like.