21 results about "Vanadyl sulfate" patented technology

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.

The invention provides a high-purity and high-solubility vanadyl sulfate crystal and a preparation method and application thereof.The preparation method of the high-purity and high-solubility vanadyl sulfate crystal comprises the following steps that ammonium metavanadate or ammonium polyvanadate serves as a raw material and is roasted at the temperature of 600-900 DEG C under the inert gas protection and reducing atmosphere conditions, and vanadium oxide is obtained; dissolving the vanadyl sulfate in a mixed solution of pure water and sulfuric acid to obtain a high-concentration vanadyl sulfate solution or vanadyl sulfate slurry; the valence state of vanadium is adjusted to 3.9-4.1; cooling, crystallizing and filtering to obtain primary vanadyl sulfate crystals; dissolving the primary vanadyl sulfate crystal in pure water to obtain a vanadyl sulfate solution, and filtering; and adding sulfuric acid, adjusting the vanadium valence state of the solution to 3.99-4.01, cooling, crystallizing, and filtering to obtain the high-purity and high-solubility vanadyl sulfate crystal. The vanadyl sulfate crystal has the advantages of small particle size, high purity, good solubility and the like, and has good application prospects and large-scale popularization potential in the field of vanadium electrolyte.

The invention discloses a method for preparing high-purity vanadyl sulfate from acidic vanadium liquid. The method comprises the following steps: S1, extracting the acidic vanadium liquid by using an organic phase A to obtain a primary loaded organic phase; s2, washing the loaded organic phase once; s3, carrying out reverse extraction on the washed primary load organic phase by using alkali liquor to obtain primary reverse extraction liquor; s4, after the pH of the primary strip liquor is adjusted, a reducing agent is added for reduction, and a reduced solution is obtained; s5, extracting the reduced solution by using the organic phase B to obtain a secondary loaded organic phase and a secondary raffinate; s6, the secondary loaded organic phase is subjected to reverse extraction, and secondary reverse extraction liquid is obtained; and S7, the secondary strip liquor is subjected to oil removal treatment, and the vanadyl sulfate electrolyte is obtained. According to the method, the calcified acidic vanadium liquid produced on an industrial scale is adopted as a raw material for producing the vanadyl sulfate electrolyte, the raw material source is stable and easy to obtain, no ammonium salt is added in the whole process, no heating process is needed, two ion extraction agents are adopted for two-stage extraction, and the vanadium yield reaches 95% or above.

The application discloses a flexible transparent aqueous zinc ion battery polyaniline / vanadium oxide composite positive electrode sheet and a preparation method thereof, and belongs to the technical field of aqueous zinc ion batteries. The preparation method comprises the following steps: using vanadyl sulfate aqueous solution as an electroplating solution, using a gold grid / PET as a working electrode, and using a platinum sheet as a counter electrode to construct a two-electrode structure; a vanadium oxide layer is deposited on the surface of the gold grid / PET by adopting a constant-voltage electrochemical deposition method, and a vanadium oxide / gold grid / PET is prepared; sulfuric acid and polyaniline are added into deionized water to prepare an electroplating solution, the vanadium oxide / gold grid / PET is used as the working electrode, the platinum electrode is used as the counter electrode, and a saturated calomel electrode is used as a reference electrode to construct a three-electrode structure; a polyaniline layer is deposited on the surface of the vanadium oxide / gold grid / PET by adopting a constant-voltage electrochemical deposition method, and the composite positive electrode sheet is obtained.

The application belongs to the technical field of electrochemical energy storage and provides an electrolyte, a preparation method and a full vanadium redox flow battery. The electrolyte comprises an acidic electrolyte, vanadyl sulfate, an additive and water, the additive is 5-amino-2-naphthalenesulfonic acid, 3-aminobenzenesulfonic acid or 3-aminopropanesulfonic acid, the concentration of the acidic electrolyte in the electrolyte is 3.0-3.5 mol / L, the concentration of the vanadyl sulfate is 1.7-2.0 mol / L, and the concentration of the additive is 0.05-0.25 mol / L. The electrolyte can improve the high-temperature stability of VO2 + under the premise of ensuring good electrochemical performance.

The invention discloses a 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-one-oxygen vanadium complex as well as a preparation method and application of the 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-one-oxygen vanadium complex. The preparation method comprises the following steps: carrying out a reaction on glucose and piperidine to obtain 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone, carrying out a reaction on 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone and vanadyl sulfate or vanadyl acetylacetonate to obtain a 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone-vanadyl complex, and carrying out a reaction on the 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone and vanadyl sulfate or vanadyl acetylacetonate to obtain the 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone-vanadyl complex. Raceme and enantiomer of the compound are shown in the specification. The obtained complex is used as a PTP1B enzyme inhibitor to be applied to preparation of drugs for reducing blood sugar. According to the invention, 2, 3-dihydro-3, 5-dihydroxy-6-methyl-4 (H) pyran-4-ketone with antioxidant activity is used as a ligand to form a complex with vanadium oxide, so that vanadium can play a role in reducing blood sugar, and oxidative stress can be potentially reduced through the antioxidant activity of the ligand.

The application provides a low-temperature sulfur-resistant denitration catalyst and a preparation method thereof, and the preparation method comprises the following steps: adding titanium dioxide into deionized water under stirring to obtain a base slurry; dissolving ammonium metavanadate in dilute sulfuric acid to react to generate vanadyl sulfate, adjusting the pH value to 2-4, and then standing and aging to obtain a vanadium precursor solution; dissolving ammonium heptamolybdate in deionized water, adding dilute sulfuric acid to adjust the pH value to 2-4, and then obtaining a molybdenum precursor solution; first adding the molybdenum precursor solution into the base slurry, mixing uniformly, then adding the vanadium precursor solution, continuing to stir, then adding an additive, stirring uniformly, and controlling the pH value of the slurry in the mixing process to be in the range of 2-4 to obtain a mixed slurry; and performing spray drying and calcination on the mixed slurry, and obtaining the low-temperature sulfur-resistant denitration catalyst after cooling. The catalyst prepared in the application has the characteristics of high dispersion of active components, high low-temperature denitration efficiency, excellent sulfur resistance and the like under the conditions of low temperature and high-sulfur flue gas.

The invention discloses a method for preparing a vanadium electrolyte by removing impurities from vanadium extraction leachate, and belongs to the technical field of electrolytes. In order to solve the problems of multiple types of impurities, high content, difficulty in separation, long flow and the like when the vanadium electrolyte is prepared from the vanadium extraction leachate, the invention provides a method for preparing the vanadium electrolyte by removing the impurities from the vanadium extraction leachate, which comprises the following steps: preparing an extraction agent composite resin from anion resin and an extraction agent; the vanadium extraction leachate is adsorbed through extraction agent composite resin, the pH is adjusted to-1-1, then a reducing agent is added for reduction, and first-stage impurity removal liquid is obtained; adsorbing the first-stage impurity removal liquid through alkali metal impurity adsorption resin to obtain a vanadyl sulfate solution; after the vanadyl sulfate solution is concentrated and enriched, the concentration of sulfate radicals is adjusted, and the vanadium electrolyte is obtained through electrolysis. According to the method, the organic extraction agent is loaded to the ion exchange resin, deep and complete separation of negative and positive impurity ions in the leachate is achieved, and the content of the impurity ions in the obtained vanadium electrolyte is low.

This invention relates to the field of hydrometallurgy and comprehensive resource utilization technology, and discloses a method for preparing vanadium oxysulfate from a solution containing strong acid vanadium salts. The method includes the following steps: (1) Leaching vanadium-containing slag with sulfuric acid to obtain a sulfuric acid leachate; filtering the sulfuric acid leachate to obtain a first vanadium-containing solution; (2) Processing the first vanadium-containing solution obtained in step (1) through an anion exchange membrane assembly to obtain a sulfuric acid solution and a second vanadium-containing solution; (3) Adding a precipitant to the second vanadium-containing solution obtained in step (2), and after solid-liquid separation, obtaining a treated second vanadium-containing solution; adding a pH adjuster to the treated second vanadium-containing solution to obtain a third vanadium-containing solution; (4) Passing the third vanadium-containing solution obtained in step (3) through a vanadium adsorbent; after adsorption saturation, desorption is performed using a desorption solution to obtain a vanadium oxysulfate solution. This invention achieves efficient recovery and recycling of sulfuric acid, significantly reducing the consumption of acid neutralization and alkali neutralization in the leachate.

The invention belongs to the technical field of electrochemical energy storage, and provides an electrolyte, a preparation method and an all-vanadium redox flow battery, the electrolyte comprises an acidic electrolyte, vanadyl sulfate, an additive and water, the additive is 5-amino-2-naphthalene sulfonic acid, 3-aminobenzene sulfonic acid or 3-aminopropanesulfonic acid; in the electrolyte, the concentration of the acidic electrolyte is 3.0 to 3.5 mol / L, the concentration of the vanadyl sulfate is 1.7 to 2.0 mol / L, and the concentration of the additive is 0.05 to 0.25 mol / L. The electrolyte can improve the high-temperature stability of VO < 2 + > on the premise of ensuring good electrochemical performance.

This invention proposes a sealing agent that does not obscure passivation color and its preparation method, belonging to the field of zinc plating and zinc alloy post-treatment technology. The method involves synthesizing a stable sol-gel polymer and adding it to water. After stirring until homogeneous, sodium molybdate and vanadium oxysulfate are added separately. After stirring to dissolve, ethylene acrylate phosphate copolymer, a wetting surfactant, and a bactericide are added and stirred until homogeneous to obtain the sealing agent that does not obscure passivation color. This sealing agent can form a thin nano-coating on the passivated metal surface without obscuring the passivation color, and it provides good uniformity of the sealed workpiece appearance, making it particularly suitable for barrel plating. Furthermore, utilizing the characteristics of a stable sol-gel polymer, the sealing agent can be infinitely diluted with water and remains stable, exhibiting low VOCs and environmental friendliness, and the film layer is water-resistant.

This invention provides a short-process method for preparing vanadium oxysulfate using vanadium slag calcination roasting tail gas. The main steps are as follows: vanadium slag is mixed with a calcining agent and roasted to obtain vanadium slag clinker; the clinker enters an acid leaching process to extract vanadium, and the roasting tail gas is countercurrently contacted with the pre-reduction liquid for pre-reduction; the clinker is countercurrently leached with dilute sulfuric acid to obtain a pentavalent vanadium-rich acid leaching solution; a diluent is added to the pentavalent vanadium-rich acid leaching solution to obtain a pre-reduction solution; roasting tail gas is introduced into the pre-reduction solution for reduction to obtain a pre-reduced solution; excess oxalic acid is added to the pre-reduced solution for impurity removal, and simultaneously, incompletely reduced pentavalent vanadium ions are reduced to form a tetravalent vanadium solution; after completion, a tetravalent vanadium extraction stock solution is obtained, and finally, a vanadium oxysulfate solution is obtained through an extraction-washing-back-extraction process. This invention achieves efficient reduction and utilization of roasting tail gas, and has the advantages of simple process, low cost, high vanadium recovery rate, high resource utilization rate, and environmental friendliness, and can significantly reduce the treatment cost of roasting tail gas.

This invention provides a method for producing vanadium oxysulfate solution, comprising: (1) mixing vanadium pentoxide, oxalic acid dihydrate, and water uniformly in a reactor to obtain a mixed solution, wherein the mass ratio of vanadium pentoxide, oxalic acid dihydrate, and water in the mixed solution is 1:(0.64-0.66):(3.5-3.6); (2) adding concentrated sulfuric acid to the mixed solution in three stages to prepare the vanadium oxysulfate solution; wherein the total mass m0 of the added concentrated sulfuric acid and the mass m of vanadium pentoxide satisfy m0:m = (2.6-2.8):1. The method of this invention has advantages such as energy saving, mild and controllable operation, and no risk of material spillage.

The invention discloses a vanadyl sulfate anti-aging composition as well as a preparation method and application thereof, and belongs to the technical field of aging resistance. The vanadyl sulfate anti-aging composition comprises the following active ingredients in parts by mass: 1-10 parts of vanadyl sulfate, 5-20 parts of vitamin E, 2-15 parts of glutathione and / or 1-8 parts of astaxanthin. According to the vanadyl sulfate anti-aging composition disclosed by the invention, the active ingredients are compounded according to a specific proportion, a quaternary active ingredient system with a synergistic effect is constructed, and the active ingredients play roles from different target spots, so that excellent anti-aging performance is shown. Meanwhile, the anti-aging composition can remarkably inhibit the natural oxidation process of vanadyl sulfate and effectively inhibit the generation of toxic + 5-valent vanadium, so that the use safety of the composition is greatly improved, and the chemical stability and bioavailability of the core active component in the long-term storage and use process are also ensured.

The invention discloses a vanadium selenide / ferrous selenide heterogeneous composite material as well as a preparation method and application thereof, and relates to the technical field of electrochemical energy storage and conversion. The preparation method comprises the following steps: firstly, reducing vanadyl sulfate through high-temperature decomposition to obtain a vanadium trioxide nanosheet; then ferrous sulfate heptahydrate and thioacetamide are subjected to a hydrothermal reaction, and ferrous sulfide microspheres are prepared; and mixing the vanadium trioxide nanosheets with the ferrous sulfide microspheres, and selenizing at high temperature to prepare the vanadium selenide / ferrous selenide heterogeneous composite material with the vanadium selenide nanosheets covering the surfaces of the ferrous selenide microspheres. Through unique hierarchical structure design and interface engineering optimization, after the prepared vanadium selenide / ferrous selenide composite material is applied to the negative electrode of the sodium ion battery, the key problems that traditional vanadium selenide is easy to dissolve, volume is expanded and the like are expected to be solved, and the vanadium selenide / ferrous selenide composite material has the technical advantages of high capacity, long circulation, low-cost preparation and the like, and has industrial application potential.

The invention discloses a method for preparing a vanadium electrolyte by extracting a calcification roasting vanadium extraction leachate, and belongs to the technical field of vanadium electrolytes. In order to improve the impurity separation depth and the product purity of the vanadium electrolyte, the invention provides a method for preparing the vanadium electrolyte by extracting a calcium roasting vanadium extraction leaching solution, which comprises the following steps: removing silicon from the leaching solution, carrying out anion extraction, carrying out first-stage washing and reduction reverse extraction, carrying out cation extraction, carrying out second-stage washing and reverse extraction, degassing and deoiling, and electrolyzing to obtain the 3.5-valent vanadium electrolyte. According to the method, an organic flocculating agent is used for desiliconizing the leaching solution, cation impurities are separated through anion extraction, first-section strip liquor containing tetravalent vanadium cations is obtained through reduction and reverse extraction, anion impurity separation is achieved through cation extraction and reverse extraction, secondary strip liquor is a vanadyl sulfate solution with impurities completely separated, and the vanadium sulfate solution with the impurities completely separated is obtained. The impurity ion content of the vanadium electrolyte product is extremely low, the vanadium yield is remarkably improved, and the preparation cost of the high-purity vanadium electrolyte is greatly reduced.

The invention relates to the technical field of metal surface treatment, and discloses a corrosion-resistant aluminum alloy strip pickling and passivating method which comprises the following steps: degreasing and cleaning the surface of an aluminum alloy strip, removing oil stains on the surface, washing with water, and enabling the degreased and cleaned aluminum alloy strip to be in contact with the pickling and passivating solution in the first aspect for reaction, so that the corrosion-resistant aluminum alloy strip is obtained. Deionized water is used for cleaning the surface of the aluminum alloy strip subjected to contact reaction treatment through the pickling passivation solution, the cleaned aluminum alloy strip is heated and dried, and the pickling passivation solution is prepared from methanesulfonic acid, phytic acid, vanadyl sulfate, gallic acid, a wetting agent and deionized water. According to the method, oxide skin is removed and aluminum salt precipitation is inhibited by utilizing high solubility of methanesulfonic acid, and a compact conversion film is formed on the surface of the aluminum alloy through synergistic deposition of phytic acid and vanadium ions and organic cross-linking sealing of gallic acid. And acid pickling and passivation are synchronously carried out under a fluoride-free and chromium-free system.

The invention discloses a regeneration method of a failed electrolyte of a vanadium battery, which comprises the following steps: (1) adding an oxidant into the failed electrolyte to oxidize vanadium ions in the failed electrolyte to tetravalent to obtain a tetravalent vanadium solution; (2) adding sulfuric acid into the tetravalent vanadium solution, concentrating, crystallizing, aging, and carrying out solid-liquid separation to obtain vanadyl sulfate crystals and sulfuric acid waste liquid; (3) adding deionized water and sulfuric acid into the vanadyl sulfate crystal, and dissolving to obtain a tetravalent vanadium basic electrolyte; and (4) electrolyzing the tetravalent vanadium basic electrolyte to obtain a 3.5-valent vanadium electrolyte and a 4.5-valent vanadium electrolyte. According to the FF, a chemical method and an electrochemical method are organically combined, the process is clear, the steps are coherent, the regeneration of the failed vanadium battery electrolyte can be effectively realized, and the FF is suitable for centralized and batch regeneration treatment of the large-scale failed vanadium battery electrolyte; the internal recycling of the sulfuric acid is realized, the consumption of new acid and the discharge of waste liquid are greatly reduced, and the regeneration cost and the environmental burden are reduced.

The application discloses vanadyl sulfate and a preparation method thereof. The preparation method comprises the following steps: adding a hydroxylamine compound into a vanadium-containing solution to react; adding acid into the obtained solution to react, so as to obtain a tetravalent vanadium ion solution; adding an alkali solution into the tetravalent vanadium ion solution to react, filtering, and obtaining a precipitate; dissolving the precipitate by using sulfuric acid to obtain a solution; evaporating and crystallizing the solution to obtain vanadyl sulfate. The method of the application uses a hydroxylamine compound as an adjusting agent, adjusts the pH value by adding acid, and adjusts the vanadium ions in the solution into tetravalent vanadium ions, which is suitable for a solution containing vanadium ions with any valence, especially a vanadium-containing solution with unknown valence composition of vanadium ions or a solution possibly containing vanadium ions with different valences, and the valence and valence composition of vanadium ions in the solution do not need to be detected and quantitatively analyzed in advance. The method of precipitating by adding alkali and then dissolving can effectively separate impurities. The method of segmental evaporation and crystallization can obtain flaky vanadyl sulfate crystals.

The application discloses a method for preparing vanadyl sulfate solid, comprising the following steps: (1) mixing V2O5 with concentrated sulfuric acid in a reactor; (2) introducing a reducing gas into the reactor, and obtaining a vanadyl sulfate solution after the reaction is completed; (3) adding a trace amount of reducing agent into the vanadyl sulfate solution, uniformly stirring, and then obtaining vanadyl sulfate crystals through post-treatment; and (4) drying the vanadyl sulfate crystals to obtain vanadyl sulfate solid. The method for preparing vanadyl sulfate solid can increase the drying temperature of vanadyl sulfate to 60-95 DEG C by introducing a trace amount of reducing agent into the vanadyl sulfate solution, so that the drying temperature is increased and the drying time is reduced, and meanwhile, the intermediate state of vanadium pentoxide is ensured not to be oxidized at a high drying temperature. The method is simple in process, improves the production efficiency of vanadyl sulfate solid, increases the yield of vanadyl sulfate solid, and guarantees the stability and quality of the product.