7 results about "Vanadium pentoxide dust" patented technology

This invention relates to a method for in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste. The technical solution is as follows: vanadium-containing solid waste is ground into powder, and the resulting vanadium-containing solid waste powder is mixed with vanadium pentoxide powder. The resulting vanadium-containing geopolymer precursor is mixed with an alkaline activator and stirred evenly to obtain a vanadium-containing geopolymer slurry. The vanadium-containing geopolymer slurry is placed in a mold, cured, demolded, cured a second time, and crushed to obtain a crushed vanadium-containing geopolymer. The crushed vanadium-containing geopolymer is mixed with deionized water to obtain a vanadium-containing geopolymer aqueous solution. Bismuth nitrate solution is added to the vanadium-containing geopolymer aqueous solution, mixed evenly, and the pH value is adjusted. A hydrothermal reaction is then carried out. Solid-liquid separation, washing, and drying are performed to obtain the visible light photocatalytic geopolymer. This invention can efficiently utilize low-vanadium content and completely eliminate vanadium. The in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste not only effectively decomposes organic pollutants under visible light conditions but also effectively fixes vanadium in the vanadium-containing solid waste.

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.

To obtain a vanadium sulfuric acid solution from vanadium pentoxide powder with high efficiency, without using a calcination furnace or reducing agent. [Solution] A cell stack comprising a plurality of unit cells, each comprising a positive electrode cell, an ion exchange membrane, a negative electrode cell, and a bipolar plate in order from the first end, wherein the bipolar plate comprises, in order from the first end, a negative electrode electrode which is a graphite molded plate containing 70% by mass or more of graphite and a positive electrode which is formed by coating a titanium plate with a platinum group metal oxide, and carbon felt is arranged in the negative electrode cell; a positive electrode tank connected to each of the positive electrode cells so as to be able to circulate fluid; a negative electrode tank connected to each of the negative electrode cells so as to be able to circulate fluid; and a reaction tank for reacting vanadium pentoxide powder with a vanadium sulfuric acid solution, is provided as an apparatus for producing a vanadium sulfuric acid solution for a vanadium redox flow battery.

The invention belongs to the technical field of laser Raman spectrum detection, and relates to a multicolor electrochromic SERS (Surface Enhanced Raman Scattering) substrate as well as a preparation method and application thereof, the method comprises the following steps: synthesizing a vanadium pentoxide nanobelt by using vanadium pentoxide powder as a raw material through a simple solvent treatment method, and preparing the multicolor vanadium oxide electrochromic SERS film substrate by adopting a spraying processing technology. The multicolor vanadium oxide electrochromism SERS substrate has electrochromism and SERS effects, the change of charge transfer, charge density and band gap width is accompanied in the electrochromism process, and the SERS performance of the multicolor vanadium oxide electrochromism SERS substrate can be remarkably changed through the change. The color, the transmittance, the energy band gap and the detection performance can be accurately, reversibly and visually regulated and controlled by naked eyes by changing the external potential. The color of the multicolor electrochromic SERS substrate and the SERS detection performance have strong relevance, the SERS detection performance and molecular selectivity of the multicolor electrochromic SERS substrate can be judged through color change, and the multicolor electrochromic SERS substrate has great significance in trace detection of to-be-detected molecules.

The application provides a preparation method of an aluminum vanadium ferromanganese alloy and belongs to the field of materials. The method comprises the following steps: sequentially drying and sintering deactivated MnFe2O4 / chitosan composite microspheres to obtain MnFe2O4 powder; mixing the MnFe2O4 powder and vanadium pentoxide powder, and then sequentially performing combustion melting, casting, cooling and crushing to obtain flaky MnFe2VO9; and mixing the flaky MnFe2VO9, aluminum powder and calcium oxide to perform aluminothermic reaction to obtain the aluminum vanadium ferromanganese alloy. The deactivated MnFe2O4 / chitosan composite microspheres are used as raw materials, the water, chitosan and organic dyes in the composite microspheres are removed through drying and calcination, the MnFe2O4 powder and vanadium pentoxide powder are uniformly mixed, the flaky MnFe2VO9 is prepared through a melting method, the flaky MnFe2VO9 is used as raw material, the aluminum powder and calcium oxide are combined to prepare the aluminum vanadium ferromanganese alloy, and resource utilization is realized.

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

The invention relates to the technical field of calcium method vanadium extraction, and provides a vanadium slag calcification vanadium extraction process which comprises the following steps: S1, mixing pretreated vanadium slag with limestone powder, and roasting to obtain clinker vanadium slag; s2, pulping the clinker vanadium slag, then carrying out first-time acid leaching and separation to obtain a first-time leaching solution and first-time tailings, pulping the first-time tailings, then carrying out second-time acid leaching and separation to obtain a second-time leaching solution and second-time tailings; and S3, ammonium sulfate is added into the first-time leaching solution, vanadium precipitation treatment and filtering are carried out, supernate and sediment are obtained, the sediment is dried and calcined, and vanadium pentoxide powder is obtained. Through the technical scheme, the problems of low vanadium leaching rate and relatively high vanadium extraction process cost in a vanadium slag vanadium extraction process in related technologies are solved.