15 results about "Vanadate" patented technology

The present application belongs to the technical field of inorganic chemical industry, and particularly relates to a method for preparing manganese vanadate from vanadium pentoxide. The method for preparing manganese vanadate from vanadium pentoxide is original, and the method for preparing manganese vanadate by roasting vanadium pentoxide in an inert gas atmosphere is used. Vanadium pentoxide powder is mixed with manganese carbonate (or manganese oxide) reagent to obtain manganese vanadate. As one of ternary vanadates, manganese vanadate has good electrochemical performance and optical performance, and can be applied in batteries and photoelectric materials. The method has great significance for the study of vanadium slag leaching mechanism and the development of subsequent products.

This invention relates to the field of nanomaterials technology, and discloses a vanadate composite material, its preparation method, and its application. A reaction solution containing a surfactant is prepared to generate bubbles. These bubbles then act as soft templates under rapid stirring and heating. Vanadium oxide is dispersed in this reaction solution and reacted at a specific temperature for a certain time, allowing the surfactant to intercalate the vanadium oxide, transforming it into vanadate. The surfactant then coats the outer surface of the vanadate, resulting in an in-situ surface-modified vanadate composite material. The surfactant layer of this composite material can regulate the reaction layer between the electrode surface and the electrolyte, preventing electrode material dissolution or structural collapse during the electrochemical reaction process, thus significantly improving the performance of electrochemical energy storage devices. The foaming effect of the surfactant ensures that the bubbles are uniformly dispersed in the liquid, acting as soft templates for the attachment and growth of vanadate crystals.

The application discloses a method for separating vanadium and chromium elements from vanadium slag, which comprises the following steps: (1) roasting the vanadium slag with sodium carbonate, mixing and roasting the vanadium slag and the sodium carbonate at a certain temperature to convert vanadium and chromium elements in different valence states in the vanadium slag into the highest valence state; (2) low-temperature leaching, leaching the roasting product obtained in the first step with calcium salt and water at low temperature to obtain a calcium chromate crude liquid and a calcium vanadate leaching residue; (3) acid leaching and vanadium precipitation, separating residual chromium in the calcium vanadate leaching residue to obtain a vanadium-containing filter cake; (4) preparing vanadium pentoxide, adding water to the filter cake obtained in the third step, adding NaOH and (NH4)2SO4 to adjust the pH, and then performing water bath heating to obtain polyvanadic acid ammonium precipitate, which is dried and calcined to obtain V2O5 powder; and (5) preparing chromium trioxide, adjusting the pH of the chromium solution obtained in the second step, adding Na2SO3, reducing Cr 6+ to Cr 3+ , combining Cr 3+ with OH ‑ to form Cr(OH)3 precipitate, filtering, and calcining to obtain Cr2O3.

This invention discloses a superhydrophobic composite passivation film and its preparation method, belonging to the field of coating preparation technology. The invention involves sequentially forming a zirconium-based chemical conversion film and a fluorinated functionalized silica layer on a substrate surface to obtain the superhydrophobic composite passivation film. The zirconium-based chemical conversion film and the fluorinated functionalized silica layer are connected by Si-O-Zr or Si-O-Al covalent bonds. The zirconium-based chemical conversion film is obtained by deposition through dissociation coordination and interfacial redox reactions using fluorozirconate, fluoride, vanadate, and manganese nitrate as raw materials; the fluorinated functionalized silica layer is obtained by spraying nano-silica after fluorination and functionalization with perfluorosilane. This invention organically couples an inorganic passivation film with a superhydrophobic micro / nano structure, resulting in a superhydrophobic composite passivation film with a static water contact angle ≥150° and a static oil contact angle ≥150°, achieving dual repulsion of water and oil, and reducing the emission of volatile organic compounds during the preparation process.

This invention discloses a method and system for vanadium extraction wastewater treatment and ferric vanadate recovery, belonging to the field of vanadium-containing wastewater treatment. The method includes: circulating wastewater into multiple equalization tanks; simultaneously adding precipitated sludge from a thickener and polyferric sulfate, and stirring the reaction; after stopping the injection, continuing to add polyferric sulfate to adjust the pH to weakly acidic, stirring, and allowing it to settle to form ferric vanadate precipitate; sending the supernatant from the equalization tanks to the reaction tank, adjusting the pH, adding flocculant, reacting, and then separating in the thickener; returning the precipitated sludge to the equalization tank currently used for vanadium extraction wastewater injection, and the supernatant entering subsequent processes; the ferric vanadate precipitate at the bottom of the equalization tank being filtered to obtain ferric vanadate filter sludge; the system includes at least two equalization tanks, one reaction tank, and one thickener. This invention achieves the recovery and utilization of ferric hydroxide by returning the precipitated sludge from the thickener, reducing the amount of polyferric sulfate added, significantly reducing operating costs, and increasing the ferric vanadate content in the filter sludge.

The application discloses a kind of vanadic potassium oxide-vanadium sulfide heterostructure vanadium-based positive electrode materials and preparation method and application, it is related to zinc ion battery positive electrode material technical field.The application is first obtained AKVO using solvothermal method, subsequently in-situ growth is introduced higher Fermi level VS2 on AKVO surface using impregnation method, constructs built-in electric field from VS2 to AKVO, so as to realize the diffusion of positive carrier to positive electrode material inside.The vanadium-based positive electrode material obtained by the method has the advantages of low cost, stable structure, sufficient active material exposure, and can overcome the slow diffusion kinetics of carriers in aqueous zinc ion battery, while inhibiting the dissolution of active material in the positive electrode material.The preparation method of the application has the advantages of simple process, wide applicability, high safety, low cost of raw materials, low operation and equipment requirements, and can be widely promoted and applied.

The application discloses a kind of high-sensitivity thermal sensitive coating of nanomaterial and preparation method thereof, wherein, high-sensitivity thermal sensitive coating of nanomaterial includes the following components by mass fraction: base component 30-50 parts;Hydroxylated nanometer bismuth acid lanthanum 5-12 parts;Amino-modified nanometer tin oxide antimony 4-10 parts;Polyimide-coated nanometer europium vanadate 3-8 parts;Dispersing agent 2-6 parts;Film forming agent 3-7 parts;Anti-aging agent 1-3 parts;Solvent 15-30 parts;The present application is high in thermal sensitivity, by designing hydroxylated nanometer bismuth acid lanthanum, amino-modified nanometer tin oxide antimony, polyimide-coated nanometer europium vanadate three kinds of innovative thermal sensitive components, synergistic effect of three, can significantly improve the thermal sensitive response sensitivity of coating, the thermal sensitive response sensitivity of coating is ≤0.1 DEG C, far higher than existing thermal sensitive coating (0.5 DEG C or more), can satisfy the demand of high-precision temperature detection.

The present application relates to a kind of methods for regulating vanadium iron alloy slag characteristics and smelting efficiency, steps are: vanadium oxide, first vanadate, aluminum particle, iron filings and lime are mixed to obtain first batch mixture, vanadium oxide, second vanadate, aluminum particle, iron filings and lime are mixed to obtain second batch mixture, and first and second batch mixture are subjected to aluminothermic reaction respectively, electrode auxiliary heating is used after reaction ends;The above operation is repeatedly performed to carry out N period batch feeding and smelting operation, wherein N≥2 and is integer, and lime is supplemented to form slag before the end of smelting in each of the first to N-1 period, and slagging operation is carried out once;After the N period smelting is completed, lime is supplemented to form slag, and slag iron is discharged after slagging ends.The present application makes full use of the advantages of vanadate, such as large heat release, good mass transfer condition, and by adjusting the addition method of slagging agent, the composition of molten slag at different stages is improved, the characteristics of molten slag are improved, so that efficient reduction and separation of smelting process are realized.

The application relates to a lithium vanadate-coated NCA ternary positive electrode material and a preparation method. x Co y Al 1‑x‑y (OH)2 and a vanadium source are simultaneously added into a container containing an organic solvent, wherein 0 x Co y Al 1‑x‑y (OH)2 and the vanadium source are mixed, and then the organic solvent is removed to obtain the mixed material; S3, the mixed material is subjected to high-temperature insulation, so that the vanadium source is converted into V2O5, and the V2O5 coats the Ni x Co y Al 1‑x‑y (OH)2 and the vanadium source are mixed, and then the organic solvent is removed to obtain the mixed material; S3, the mixed material is subjected to high-temperature insulation, so that vanadium source is converted into V2O5, and the V2O5 coats the x Co y Al 1‑x‑y (OH)2, to obtain a precursor coating; S4, the precursor coating and LiOH.H2O are mixed in proportion and then calcined to obtain the lithium vanadate-coated NCA ternary positive electrode material. In the preparation method, the advantages of a wet chemical method and the advantages of a solid-phase method are combined, the uniformity and effectiveness of coating are ensured, and the performance of the ternary positive electrode material is improved.

The application relates to a preparation method and application of a wide-temperature-range sodium vanadium iron sulfate positive electrode material, and relates to a preparation method and application of a positive electrode material. In order to solve the problem of insufficient cycle stability of an existing sodium iron sulfate positive electrode material, the preparation method comprises the following steps: a sodium source, a vanadium source, an iron source, a sulfate and a carbon source are mixed according to a stoichiometric ratio, and ball milling treatment is carried out under a rotating speed of 300-600 r / min to obtain a precursor; the precursor is subjected to first-stage sintering at 150-200 DEG C, and then subjected to second-stage sintering at 650 DEG C to obtain a NaVFe(SO4)3 positive electrode material with a carbon-coated structure. Through optimization of a ball milling process and a segmented sintering system, the crystallinity and structural integrity of the material are effectively improved, the prepared NaVFe(SO4)3 positive electrode material is uniform in particle size, the carbon-coated layer is complete, and the material exhibits excellent structural stability, high-rate performance, wide-temperature-range performance and significantly improved energy density. The application belongs to the technical field of secondary battery electrode materials.

This application provides a method for preparing a rubidium salt-modified sulfur dioxide oxidation catalyst, comprising the following steps: S1, providing diatomaceous earth, silica, sodium sulfate, a forming agent, vanadium pentoxide, caustic alkali, silicate, and rubidium sulfate; S2, adding vanadium pentoxide and rubidium sulfate to an aqueous solution of caustic alkali, whereby vanadium pentoxide dissolves under alkaline conditions to form a soluble vanadate or metavanadate complex system, followed by adding an aqueous sulfuric acid solution to adjust the pH value, ensuring the vanadate system remains stable in the solution, and then adding silicate to obtain a first solution; S3, mixing diatomaceous earth, silica, sodium sulfate, and the forming agent uniformly to obtain a dry base material, adding it to the first solution and mixing, then kneading, shaping, drying, and calcining to obtain the finished catalyst. This application can improve the activity of vanadium catalysts at low temperatures and enhance the catalyst strength.

An inorganic material in a form of open-porosity particles, each of the particles comprising a lead vanadate or phosphovanadate of formula Pb3-xXx(VO4)2-2y(PO4)2y, wherein x=0 or x>0 but ≤0.33; y=0 or y>0 but <1; X=Ba2+, Ca2+, Sr2+ or Cd2+; and metallic lead or a lead salt. A method for preparing the material, a method for capturing iodine present in a gaseous effluent as well as a method for conditioning iodine present in a gaseous effluent in a form of an iodoapatite.

The application discloses a reagent for detecting monohydroxyphenol metabolites in urine and a preparation method thereof, and belongs to the technical field of urine detection reagents. The preparation method comprises the following steps: (1) preparing a mercurous nitrate solution, a mercury sulfate solution and a phosphomolybdic acid solution respectively; (2) mixing the three solutions and then laser soaking to prepare a composite system with stronger oxidation performance; (3) cross-linking after co-dissolving vanadate and nickel ions to form a complex three-dimensional hole cross-linking structure; and (4) ultrasonically mixing the first solution and a material containing nickel to obtain a simple, efficient and accurate urine monohydroxyphenol metabolite detection reagent. The reagent for detecting monohydroxyphenol metabolites in urine has the advantages of high sensitivity, simple operation, stable and reliable results and the like, and is suitable for clinical detection, scientific research and the like.