263 results about "Vanadium trioxide" patented technology

The invention relates to a method for producing vanadium trioxide by adopting a fluidized bed reactor, belonging to the field of the chemical industry and metallurgy. Heat is provided for reaction by a mode of preheating the materials containing vanadium to be 400-550 DEG C, the materials containing vanadium are preheated by adopting a two-stage cyclonic preheater, and high-temperature smoke generated by a combustion chamber provides heat. Gas with heat value of being larger than 1250kcal / Nm<3> is adopted to be reduced for 5-20 minutes at the temperature of 700-850 DEG C, and a vanadium trioxide product with vanadium grade of being more than 66% can be obtained. The method has the advantages of high reduction efficiency, good energy utilization and suitability for large-scale production of vanadium trioxide.

The invention relates to a fluidized reduction furnace for producing high-purity vanadium trioxide, which comprises a fluidized bed reactor and a built-in heat exchange component, wherein the heat exchange component is a tube type heat exchanger, and a heat exchange tube is vertically provided with at least two layers of sieve mesh plates to form at least three layers of fluidized reaction chambers. The invention also provides a fluidized reduction method for producing the high-purity vanadium trioxide. The fluidized reduction furnace and the fluidized reduction method have the advantages that firstly, materials in each layer are in a fully-mixed state, and material flow among the layers is in a plug flow state; secondly, the multi-stage fluidized reduction conditions are provided, raw materials enter from the lowermost layer, are reduced step by step and are purified gradually, and the running stability and the operating rate of equipment are improved in a manner of reduction step by step; and thirdly, the fluidized reduction furnace can be used for producing the high-purity vanadium trioxide, and the vanadium grade is larger than 67.9 percent.

The present invention relates to method for synthesizing positive electrode material vanadium lithium phosphate of lithium ion cell by using sol-gel process. Said method includes the following steps: adopting sol-gel reaction, using vanadium pentoxide or vanadium trioxide, ammonium dihydrogen phosphate, lithium carbonate and citric acid as raw material to synthesize precursor body of lithium ion cell positive electrode material Li3V2(PO4)3, then under the protection of inert gas roasting said precursor body to make V5+ be completely reduced into V3+ and simultaneously produce product Li3V2(PO4)3.

The present invention relates to a preparation method for electrolyte of vanadum oxidation-reduction liquid stream. It contains 1, putting weight ratio 1.5-2.5 :1 vanadium trioxide and vanadium pentoxide powder in furnace and calcination at 200-700 degree centigrade, to make yellow powder became black powder to obtain multivalent vanadum compound, wherein quadravalence vanadum greater than total vanadum by 50 per cent, 2, adding distilled water in specific gravity 1.84 concentrated sulfuric acid to proceed 2 : 1 diluting then adding above-mentioned compound, according to mass fraction preparation to 65-75 per cent concentration vanadyl sulfate solution, wherein total vanadum concentration in 25-45 per cent, 3, adding 1-10 per cent concentration alkali salt or alkali salt and alkaline earth metal salt. Said invention adds additive in vanadyl sulfate solution, which not only raising vanadum ion solubility, preferably solving crystallizing jamming battery flow field problem in charge discharge process, but also reducing vanadium ion osmotic problem in film, greatly raising battery energy source efficiency.

The invention relates to a vanadium electrolytic solution preparation method, which comprises: (1) using ammonium metavanadate with a purity of 99.0-99.5 wt% as a raw material, dissolving, filtering to obtain a purified vanadium dissolving solution, and carrying out acid ammonia precipitation to obtain an ammonium polyvanadate solid phase; (2) calcining the ammonium polyvanadate solid phase in a reducing atmosphere to obtain the mixture containing vanadium tetraoxide and vanadium trioxide, wherein a molar ratio of vanadium tetraoxide to vanadium trioxide is (0.95-1.05):1; and (3) carrying out acid dissolving on the mixture to obtain the vanadium electrolytic solution. According to the present invention, when the vanadium concentration of the vanadium electrolytic solution is 2 mol / L, the contents of impurities such as silicon, calcium and aluminum can be respectively reduced to less than 7 ppm, less than 10 ppm and less than 10 ppm, the total impurity content is less than 65 ppm, and the requirement of the vanadium battery vanadium electrolytic solution can be met; and compared to the acid and alkaline alternating impurity removing method, the method of the present invention has the following advantages that the vanadium loss can be significantly reduced, the vanadium recovery rate is more than 96.6%, the vanadium valence in the obtained vanadium electrolytic solution is +3.5, and the obtained vanadium electrolytic solution can be used directly as the vanadium battery electrolytic solution without activation.

A process for preparing crystalline V2O3 includes such steps as dispersing V2O5 powder in proper organic solvent, adding to high-pressure tubular reactor, reacting at a certain temp under a certain pressure, and removing solvent.

The invention provides a production method of a vanadium-nitrogen alloy. The method comprises the following steps of: a) reducing vanadium pentoxide to vanadium tetraoxide; b) adding carbon powder into vanadium tetraoxide and then carrying out dry powder extrusion on the resulting mixture for ball forming; and c) feeding the formed ball into a medium frequency vertical furnace, vacuumizing the furnace to be lower than 300Pa, and heating the ball inside the furnace to 1000 DEG C, introducing nitrogen into the furnace, preserving the positive pressure of 0.8-1.0MPa, increasing the temperature to 1200-1500 DEG C, and preserving heat for 3-5 hours; preserving the positive pressure of the nitrogen to 0.3-0.5MPa, increasing the temperature to 1500-1600 DEG C, and preserving heat for 1 hour; at last cooling the material to be lower than 200 DEG C and discharging the material, wherein the product is the vanadium-nitrogen alloy. The method conquers the defects that vanadium pentoxide is low in melting point, temperature control demand is strict, vanadium trioxide is unstable in normal state and is easily oxidized in the existing vanadium-nitrogen synthesis production process, and is relatively loose in temperature control demand, simple in equipment, good in product quality, stable in production process, and low in production cost.

The invention relates to a preparation method for NaV2O5. According to the invention, sodium carbonate (Na2CO3), vanadium trioxide (V2O3) and vanadium pentoxide (V2O5) are used as raw materials and are mixed according to a mole ratio of 2: 1: 3, and an obtained mixture is sintered in an inert gas atmosphere like a high purity nitrogen atmosphere or an argon atmosphere at a temperature of 600 to 800 DEG C for 10 h so as to obtain NaV2O5 polycrystalline powder. According to the invention, nontoxic Na2CO3 is used to substitute a raw material with great toxicity, NaVO3, used in traditional preparation methods, which enables hazards of an experiment to be reduced and sintering time to be greatly shortened, so the method has great significance to future industrial production and incomparable advantages compared to traditional methods.

The invention discloses a conductive heating coating which comprises the following components in parts by weight: 24-36 parts of lithium silicate, 20-30 parts of graphite nodules, 16-18 parts of vanadium trioxide, 10-20 parts of azo-dicarbonamide, 8-12 parts of zinc oxide, 4-12 parts of benzoyl peroxide, 12-18 parts of dibutyl phthalate, 10-20 parts of triphenyl phosphate, 4-8 parts of isopropyl acrylate, 12-16 parts of epoxy resin, 8-12 parts of butyl acetate, 4-12 parts of ethylene glycol, 2-8 parts of ethylene glycol monohexyl ether, 4-8 parts of dimethyl ethanolamine, and 4-6 parts of zirconate calcium carbonate. The conductive heating coating provided by the invention is simple in manufacturing; the adopted production raw materials are non-toxic, therefore, the coating is good in application effect, and environment-friendly; and a conductive paint film formed by the coating has good electric conductivity.

The invention discloses a preparation method of a vanadium-aluminum alloy, which can lower the producing cost of the vanadium-aluminum alloy. In the method, vanadium trioxide and vanadium pentoxide are taken as raw materials, Al powder is taken as a reducing agent and the vanadium-aluminum alloy and slag are obtained by igniting and reducing, wherein the weight ratio of the vanadium trioxide to the vanadium pentoxide is 1:1-2; and the using amount of the Al powder is 1.2 to 1.5 times of V ideal using amount (namely, the using amount of the Al powder needed for fully reducing the vanadium trioxide and the vanadium pentoxide into metal vanadium) of fully reduced raw materials. Compared with the conventional process, the method has lower cost and is fully accordant with the requirement on mass industrial production; moreover, the produced vanadium-aluminum alloy has low impurity content; a final vanadium-aluminum alloy comprises the following components in percentage by weight: 75 to 85 percent of V, less than or equal to 0.3 percent of Fe and less than or equal to 0.3 percent of Si; and the requirements on further subsequent processing are met.

The invention discloses a vanadium metal smelting process. The process prepares vanadium metal by combining a microwave fluidized bed technology and a flexible flat cable (FFC) electric deoxidation technology and using vanadium pentoxide as a raw material. The method comprises the following steps of: directly reducing the vanadium pentoxide with low melting point (the melting point is 690 DEG C) into vanadium trioxide in short time at the temperature of between 600 and 650 DEG C by using the characteristics of high heating efficiency, quick temperature rise and gas-solid contact of a microwave fluidized bed and adopting hydrogen and / or carbon monoxide as reducing gas; directly preparing the vanadium trioxide which has high melting point into an oxide cathode by molding and sintering processes; and performing FFC electric deoxidation on the oxide cathode in molten salt of calcium chloride or mixed molten salt of calcium chloride and sodium chloride, crushing the electrolyzed cathode by using ultrasonic wave, then performing water washing, acid washing and alcohol washing to remove impurities, and finally obtaining the vanadium metal with purity of over 99 percent, wherein the current efficiency is kept over 70 percent, the energy utilization rate of microwave heating equipment is over 80 percent, and the electrolysis energy consumption is 10kwh to 13kwh / kg.