87 results about "Sodium Vanadate" patented technology

The invention discloses a catalyst and method for preparing 3-methyl-2-aminobenzoic acid through continuous catalytic hydrogenation, and the method comprises the following steps: pretreating an activated carbon carrier by using pretreatment reagents such as nitric acid and hydrogen peroxide to remove impurities in the carrier; modifying the carrier by using an auxiliary component 1 such as sodium carbonate, stannic chloride, potassium carbonate and lanthanum nitrate, and then roasting and reaming; and finally, active components such as platinum chloride and palladium chloride are mixed and impregnated with an auxiliary component 2 such as oxalic acid, polyethylene glycol-400, sodium metavanadate and polyvinylpyrrolidone, the auxiliary component 2 promotes dispersion of the active metal, and the auxiliary component 2 and the auxiliary component 1 have a synergistic effect, so that the active metal is loaded more uniformly and firmly, and the obtained catalyst has higher activity and selectivity and longer service life. The catalyst is applied to preparation of 3-methyl-2-aminobenzoic acid through catalytic hydrogenation in a fixed bed reactor, the reaction can be continuously and automatically controlled, the three wastes in the reaction process are few, the yield of a target product is high, the service life of the catalyst is long, and the catalyst is suitable for industrial production.

The present invention relates to a method for preparing aluminum-vanadium alloy by aluminothermic reduction of sodium metavanadate, which comprises the following steps: S1, using powdered sodium metavanadate as a raw material, adding aluminum powder and calcium oxide, and mixing evenly; S2, pressing the mixed material into a columnar mass; S3, placing the mass into a tubular furnace, and performing a period of high-temperature insulation in an inert gas atmosphere, so as to obtain a mixture of an aluminum-vanadium master alloy and calcium aluminate-based slag. The method of the present invention adopts aluminothermic reduction to prepare an aluminum-vanadium master alloy, and its raw material is sodium metavanadate, an intermediate in the process of treating vanadium slag. The cost of using it as a raw material is lower, and the process of treating vanadium slag is shortened, avoiding the environmental pollution problem generated in the process of preparing V2O5 by sodium metavanadate using a traditional process, and obtaining an aluminum-vanadium master alloy in one step by a more efficient aluminothermic reduction method, thereby realizing efficient short-range green utilization of resources.

The invention discloses a sodium metavanadate-based catalyst activity gradient regulation and regeneration system and method, and relates to the technical field of industrial catalyst regeneration, the sodium metavanadate-based catalyst is of a unique layered structure, the sodium metavanadate-based catalyst comprises an outer layer, a middle layer and an inner layer from the surface to the interior in sequence, and active components and doping elements of all the layers are different; the outer layer is doped with high-content sodium metavanadate and manganese oxide, reactant molecules can be quickly adsorbed and activated in the initial stage of the reaction, the manganese oxide can provide additional active sites, reduce reaction activation energy and promote quick start of the reaction, and the middle layer is doped with a proper amount of sodium metavanadate and cerium oxide, so that the reaction is more stable in the process of the reaction. The cerium oxide can adjust migration and conversion of oxygen species on the surface of the catalyst, optimize the reaction path, improve the selectivity of a target product and reduce side reactions, the inner layer is doped with the low-content sodium metavanadate and tungsten oxide, and the structural stability of the catalyst under high-temperature and long-time reaction is maintained by means of the high stability of the tungsten oxide.

The invention discloses a preparation method of atomic layer deposition synergistic doping modified sodium vanadate, which uses water as solvent, anhydrous sodium iodide and monohydrated vanadium oxyphosphate as sodium source, vanadium source and phosphorus source, and introduces cobalt acetate tetrahydrate and nickel acetate tetrahydrate, and realizes one-step hydrothermal synthesis of HNaV6O assembled by nanosheets and co-embedded with cobalt ions, nickel ions and phosphate ions by synergistically controlling their concentration and ratio, reaction temperature, reaction time and other parameters. 16 ·4H2O nanoflower structure. This method has a simple reaction process, low temperature, easy control, and does not require large equipment and harsh reaction conditions. On this basis, the atomic layer deposition technology was used to successfully realize the cobalt ion, nickel ion and phosphate ion co-embedded HNaV6O with ultra-thin nanoscale metal oxides. 16 Uniform coating of 4H2O positive electrode material. The present invention provides the application of the material in the positive electrode material of sodium ion battery.

The present invention provides a method for producing a molybdenum-vanadium-aluminum-chromium alloy with high uniformity. The composition of the molybdenum-vanadium-aluminum-chromium alloy is as follows: Mo 25% - 28%, V 24% - 27%, Cr 28% - 31%, with the balance being Al, O ≤ 0.05%, C ≤ 0.05%, and the segregation of the main content being < 0.6%. It relates to the field of metallurgical technology. The technological steps are as follows: (1) Prepare an ammonium molybdate-ammonium dichromate-ammonium metavanadate precursor by hydrothermal method using sodium molybdate, sodium metavanadate, sodium dichromate, and ammonium chloride; (2) Perform high-temperature treatment on the precursor to obtain a MoO3 / V2O5 / CrO3 composite material; (3) Mix the MoO3 / V2O5 / CrO3 composite material, refined aluminum powder, and calcium oxide in proportion, load them into a furnace and ignite to undergo a thermite reaction to obtain a molybdenum-vanadium-aluminum-chromium alloy ingot. Compared with the molybdenum-vanadium-aluminum-chromium alloy produced by the traditional thermite method, the uniformity of the present invention is greatly improved, and it can be used for the production of titanium alloys such as TB2, TB9, TB15, and TB16.

The invention belongs to the field of polymer catalysis, and discloses a DMF (Dimethyl Formamide)-based heteropolyacid synergistic catalysis system as well as a preparation method and application thereof. The method comprises the following steps: adding sodium molybdate and disodium hydrogen phosphate into deionized water, adjusting the pH value to 2-3, then adding sodium metavanadate, heating and stirring at 95-100 DEG C, cooling at room temperature, and then adding diethyl ether and a sulfuric acid solution until an upper diethyl ether phase becomes light yellow from colorless; and drying the lowermost layer phase yellow oily substance, grinding and drying to obtain H5PMo10V2O40, and adding the H5PMo10V2O40 into a DMF (Dimethyl Formamide) solvent to prepare the DMF-based heteropolyacid synergistic catalysis system. According to the method, DMF is used as a solvent, the D-fructose is catalytically cracked in oxygen through a one-step method to be converted into DFF, gas does not need to be switched in the reaction process, and the prepared catalytic system is excellent in catalytic benefit, can be recycled, saves manpower and material resources in the catalytic process, is low in equipment requirement and can be suitable for reactions such as catalytic cracking of biomass.

A polyhydric alcohol amine absorbent suitable for a CO2 capture process from a flue gas with a low CO2 partial pressure, which takes continuous operation stability and safety into account. The polyhydric alcohol amine absorbent comprises the following main components: a main absorbent, an auxiliary absorbent, an antioxidant, a corrosion inhibitor and water, and the concentration of the absorbent is 22-58% by mass fraction, wherein the main absorbent comprises one or two of diethylenetriamine, N,N-diethylethanolamine and hydroxyethyl ethylenediamine; the auxiliary absorbent comprises one or two of monoethanolamine, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-ethyl-1,3-propanediol and 2-amino-2-methyl-1-propanol; the antioxidant comprises one or two of butanone oxime, acetoxime, hydrazine carbonate and ammonium sulfite; the corrosion inhibitor is sodium vanadate; and the balance is desalinated water.

The invention provides a sodium metavanadate purification process, and belongs to the technical field of high-purity vanadium processing. Comprising the following steps: A, coating a lower filter belt with sodium metavanadate-containing pug subjected to draining treatment through a feeding mechanism; b, after the sludge is dewatered by the first filter pressing station, part of cleaning liquid generated by cleaning an upper filter belt and a lower filter belt is used for humidifying the sludge which is dewatered for the first time at a primary water adding station; c, dewatering is completed at a second filter pressing station, and part of cleaning liquid generated by cleaning the upper filter belt and the lower filter belt is used for conducting water adding treatment on the pug subjected to secondary dewatering at a secondary water adding station; d, carrying out filter pressing dehydration for the last time; e, removing the filter residues which are finally dehydrated and adhered to the upper surface of the upper filter belt and the lower surface of the lower filter belt at a discharging station; and F, the remaining cleaning liquid is filtered through an upper filter belt in front of the feeding station, and ammonium chloride is added for vanadium precipitation treatment. The method has the advantages of simple process, high yield and the like.

The present application relates to a kind of rack steel layered casting composite flux and its preparation, method for using, the component and content of composite flux are as follows: high-purity iron powder: 40%~50%, high-purity rare earth powder: 20%~30%, analytical pure sodium pyrovanadate: 20%~40%.Using layered casting process of composite flux with rack steel, the macrosegregation and shrinkage cavity defects of large rack steel ingot can be significantly improved, which provides a simple, feasible and effective way to improve the composition homogenization degree of ingot, helps to improve the overall quality of rack steel ingot, also shortens the production cycle and improves the production efficiency, thereby improves the production capacity of large rack steel ingot, reduces the production energy consumption and production cost;The present application has important significance for breaking through the bottleneck of high homogenization large rack steel ingot manufacturing, laying the new technical theoretical foundation and industrialization application of large rack steel ingot casting, and improving the manufacturing technology level of key components of large equipment in China.

The present invention discloses a preparation method of cobalt-doped and synergistically MXene-coated sodium vanadate composite powder. Using water as a solvent, sodium iodide anhydrous and vanadyl phosphate monohydrate as the sodium source and vanadium source, and introducing cobalt acetate tetrahydrate, by synergistically controlling parameters such as concentration and ratio, reaction temperature, reaction time, filling ratio, etc., the synthesis of HNaV6O embedded with cobalt ions assembled by nanosheets through a one-step hydrothermal method is achieved. 16 Using CTAB, the etched Ti3C2Tx and HNaV6O 16 ·4H2O are compositely assembled through electrostatic coupling, and finally cobalt-doped and synergistically Ti3C2Tx-coated HNaV6O 16 ·4H2O is prepared; the present invention improves the crystal structure and electronic conductivity of HNaV6O 16 ·4H2O, enhances its capacity and cycle stability, and the present invention also discloses the application of this material in the cathode material of sodium-ion batteries.

The present invention provides a preparation method of a structure-modified sodium ion battery positive electrode material, comprising the following steps: S1, mixing a sodium source, an iron source, a phosphorus source, a first carbon source, a structure modifier, and deionized water, adding the mixture to a high-gravity reactor rotating at 25,000 to 35,000 rpm, reacting at a temperature of 80 to 100° C. for 1 to 2 h, drying, and then calcining at 400 to 650° C. for 8 to 12 h in an inert gas atmosphere to obtain a precursor, wherein the structure modifier is at least one of sodium vanadate, sodium titanate, sodium manganate, sodium cobaltate, sodium chromate, metatitanic acid, magnesium oxide, copper oxide, zinc oxide, and yttrium oxide; S2, mixing the precursor, a second carbon source, and a chelate solution, adjusting the pH to 2.5 to 4.0, grinding the mixture at a temperature of 60 to 90° C. until the D50 is less than 0.95 μm, spray drying, and calcining at 400 to 650° C. for 8 to 12 h in an inert gas atmosphere. h obtain the structure-modified sodium ion battery positive electrode material.

The invention provides a method for extracting vanadium by roasting high-manganese vanadium slag, which comprises the following steps: (1) mixing high-manganese vanadium slag, return slag, industrial salt and sodium carbonate to obtain a mixture; the manganese content of the high-manganese vanadium slag is more than 8wt%; (2) roasting the mixture in a rotary kiln to obtain a roasted material; the roasting treatment comprises an oxidation stage at the temperature of 300-500 DEG C and a sodium modification stage at the temperature of 510-750 DEG C; and (3) the roasted material is cooled and then subjected to water leaching, and a sodium vanadate solution and tailings are obtained. Through the roasting treatment process, the occurrence of a soft melting state of the manganese element is inhibited, and the phenomena of balling and skinning in the kiln are reduced, so that the recovery rate of vanadium is improved, and the TV content in the tailings is low.

The invention belongs to the technical field of energy storage batteries, and particularly relates to a method for preparing a vanadium oxide electrolyte based on a sodium vanadium oxide solution and a vanadium redox flow battery. The method comprises the following steps: S1, sodium treatment leaching: treating a vanadium-containing raw material by adopting a sodium-containing compound to generate a sodium vanadium solution; s2, valence state regulation and control: dividing the sodium vanadium solution into two parts, adjusting the pH value of the first part to be acidic, and then adding a reducing agent to carry out a reduction reaction to obtain a negative electrode electrolyte containing V < 3 + > / V < 4 + >; and adding an oxidizing agent into the second part for oxidation reaction to obtain the positive electrode electrolyte containing V < 4 + > / V < 5 + >. According to the method, the vanadium slag is used for replacing high-purity V2O5 to prepare the electrolyte, so that the cost of raw materials is reduced; according to the electrolyte prepared by the invention, the energy efficiency of the battery is high; meanwhile, the preparation method disclosed by the invention adopts an integrated process, and an intermediate product treatment link is omitted, so that the preparation steps are simpler, and the production efficiency is remarkably improved.

The application discloses a kind of high-efficiency heterogeneous catalyst for CO2 ring addition preparation cyclic carbonate and its preparation method and application, belong to catalyst technical field.The high-efficiency heterogeneous catalyst is transition metal doped polyoxometalate coordination polymer, chemical general formula is C 16 H 58 M2N2Na2O 48 V 10 Wherein, M is selected from Co 2+ , Ni 2+ , Cu 2+ Or Zn 2+ Its preparation method is: sodium vanadate, transition metal acetate and bis (2-hydroxyethyl) amino (trihydroxymethyl) methane ligand are dissolved in water with pH being 1~3, stirring reaction, after filtration, crystallization is stationary, and is obtained.In the ring addition reaction of CO2 and epoxide, the catalyst and cocatalyst tetrabutylammonium bromide synergistic effect, catalytic yield can be up to 98.2%, selectivity is more than 99%, and catalytic activity still remains at 88% after recycling five times.

The invention discloses a catalyst for preparing N-(1-ethyl propyl)-3, 4-dimethylaniline through continuous catalytic hydrogenation and a preparation method and application thereof, the catalyst comprises a carrier, and an active component platinum and an auxiliary component which are loaded on the carrier, the auxiliary component is at least one of sodium citrate, disodium ethylene diamine tetraacetate, sodium metavanadate, oxalic acid, zirconium oxychloride, yttrium nitrate or sodium carbonate; and the active component and the auxiliary component both account for 0.1-10% of the mass of the catalyst. The catalyst is used for preparing N-(1-ethyl propyl)-3, 4-dimethylaniline through hydrogenation, the reaction can be continuous, the safety performance is better, and the catalyst has high catalytic activity and stability.

The invention relates to a VOx nanoring for a lithium ion battery negative electrode material, a preparation method of the VOx nanoring, the lithium battery negative electrode material and a lithium battery. The preparation method comprises the following steps: S100, preparing raw materials: preparing sodium orthovanadate and thioacetamide; s200, mixing the raw materials to obtain a mixed solution; s300, carrying out heating reaction to generate turbid liquid with a stable nanometer annular structure; and S400, cooling and separating, namely taking out the turbid liquid in the high-pressure kettle, cooling to room temperature, separating by a centrifugal machine, cleaning and drying to obtain the dry nanoring capable of being used for the lithium battery negative electrode material. The preparation method disclosed by the invention is convenient, simple, good in repeatability, high in yield and capable of realizing large-scale production and industrialization. The prepared nanoring structure can be kept stable for a long time, the size and morphology of the nanoring are controllable, and the morphology can be regulated and controlled through the reaction time, the reaction temperature, the reactant ratio and the like.

The invention relates to a method for green vanadium precipitation and sodium-ammonium circulation of a sodium modified vanadium solution, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: adding hydrochloric acid and ammonium chloride into the sodium vanadium solution, adjusting the pH value, carrying out heating reaction, and carrying out solid-liquid separation to obtain ammonium polyvanadate and vanadium precipitation wastewater; adding a reducing agent into the vanadium precipitation wastewater for reduction reaction; adding a polycarboxylic acid water reducer, adjusting the pH value with ammonia water, and carrying out solid-liquid separation to obtain purified wastewater and vanadium-chromium filter residues; introducing carbon dioxide gas into the purified wastewater until the purified wastewater is saturated, cooling, crystallizing, and carrying out solid-liquid separation to obtain sodium bicarbonate solid and crystallization mother liquor; and evaporating and concentrating the crystallization mother liquor until the concentration of ammonium chloride is 65-75g / L, then cooling and crystallizing at the temperature of-10-20 DEG C, and carrying out solid-liquid separation to obtain ammonium chloride solid and residual wastewater. According to the invention, high-efficiency and high-purity recovery of sodium and ammonium ions and closed circulation of the system are realized, and the problems of sodium and ammonium circulation and impurity accumulation in the traditional process are solved.

The invention discloses a temperature response composite gel electrolyte for a wide-temperature-range zinc battery, a preparation method and the zinc battery, and solves the problem that the existing gel electrolyte is difficult to consider wide-temperature-range adaptability, low-temperature conduction efficiency and high-temperature safety at the same time. The electrolyte is of a temperature-sensitive hydrogel cellulose-high-conductivity ZIF-8 composite substrate membrane temperature-sensitive hydrogel three-layer structure. The substrate membrane improves the mechanical strength of each temperature range and the conductivity of zinc ions; the hydrogel is dimethyl sulfoxide modified poly (N-isopropylacrylamide), the hydrogel swells at a low temperature to prevent free water condensation so as to guarantee conduction, and shrinks at a high temperature to improve hardness so as to avoid dendritic crystal puncture and thermal runaway. The preparation method comprises the following steps: preparing a solvothermal ZIF-8, performing suction filtration to prepare a basement membrane, initiating in-situ polymerization of the hydrogel by ultraviolet and the like. The zinc battery takes the electrolyte, a sodium vanadate / ammonium vanadate positive electrode and a zinc metal / alloy negative electrode as cores, can stably work at-40 to 60 DEG C, is easy to industrially obtain raw materials and simple in process, and is adaptive to harsh energy storage scenes such as field military equipment and the like.

According to the method for preparing the vanadium electrolyte through targeted impurity removal and one-step vanadium precipitation of the sodium-modified vanadium solution, high-purity ammonium metavanadate is prepared through targeted impurity removal of the sodium-modified vanadium solution, and calcination is conducted under the protection of inert gas of ammonium metavanadate, so that the consumption of auxiliary materials and the generation amount of waste water are greatly reduced; the manufacturing process cost of the vanadium electrolyte is effectively reduced; by adopting a two-time silicon removal mode, the use amount of a silicon removal agent is reduced while high-efficiency removal of chromium is realized, and the generation amount of silicon removal slag and the vanadium loss in the silicon removal process are reduced. In addition, the pH value of the liquid subjected to deep silicon removal is lower than that of the liquid subjected to chromium removal, so that the aluminum concentration of the liquid subjected to deep silicon removal can be effectively reduced, and conditions are created for improving the subsequent hydrolysis aluminum removal effect; the crude ammonium metavanadate is pulped and washed by adding a complexing agent, the content of cations such as potassium, sodium and calcium is reduced, the ammonium metavanadate is calcined under the protection of inert gas to obtain low-valence vanadium oxide, the acid solubility of the vanadium oxide is improved, and the consumption of a reducing agent in the preparation process of the vanadium electrolyte is reduced.

This invention belongs to the field of battery electrode material technology, and discloses a calcium-doped sodium vanadate electrode material, its preparation method, and its application in aqueous ammonium-ion batteries. The preparation method includes the following steps: vanadium pentoxide is dispersed in water, hydrogen peroxide is added and stirred, and calcium nitrate and sodium hydroxide are added. The resulting mixed solution is transferred to a reaction vessel for hydrothermal reaction. After cooling to room temperature, the sample is washed, freeze-dried, and collected. When the calcium-doped sodium vanadate cathode material is applied to an aqueous ammonium-ion battery, electrochemical test results show that when paired with a 3,4,9,10-perylenetetracarboxylate diimide anode, it exhibits high reversible specific capacity and excellent rate performance, demonstrating its outstanding comprehensive electrochemical performance and great potential in practical energy storage applications. This invention features a simple synthesis route, is environmentally friendly, has low raw material costs, and the overall process has industrial application potential, making it suitable for promotion and application as a novel energy storage device.

The application discloses an aluminum alloy micro-arc oxidation plating solution and a preparation method and application thereof. The aluminum alloy micro-arc oxidation plating solution comprises water, potassium hydroxide and the following preparation raw materials: sodium hexametaphosphate 8-15 g / L; sodium silicate 10-18 g / L; sodium metavanadate 10-15 g / L; sodium molybdate 10-18 g / L; ethylene glycol 1-5 g / L; beta-glycerophosphoric acid sodium 2-5 g / L; sodium hexafluorotitanate 3-6 g / L; boric acid 1-3 g / L; and alkaline aluminum oxide sol, wherein the content of the aluminum oxide is 0.1-0.3 g / L; and the pH of the micro-arc oxidation plating solution is 9-12. The plating solution is suitable for surface treatment of aluminum alloy, can significantly improve the hardness, wear resistance and corrosion resistance of the material, and makes the surface more smooth and flat. The application further provides the preparation method and application of the aluminum alloy micro-arc oxidation plating solution.

The invention discloses a method and device for preparing ammonium polyvanadate by crystallizing a sodium vanadate solution, and the method comprises the following steps: 1) adding ammonium sulfate and sulfuric acid into the sodium vanadate solution for premixing to obtain a mixed vanadium solution; the molar ratio of ammonium ions to vanadium in the mixed vanadium liquid is 0.6-1.2, the pH value is 2.2-2.9, the premixing temperature is controlled to be 35-65 DEG C, and it is guaranteed that no crystal precipitate is generated in the mixed vanadium liquid; and 2) crystallizing the mixed vanadium liquid under the conditions that the temperature is 92-100 DEG C and the pH value is 1.9-2.1 to obtain the ammonium polyvanadate slurry. According to the method, after ammonium sulfate and concentrated sulfuric acid are sequentially added into the sodium vanadate solution, no crystal precipitate is generated, the stability of the ammonium polyvanadate crystallization process can be improved, the particle size of the ammonium polyvanadate can be increased to reduce the cleaning difficulty, the stability and purity of the ammonium polyvanadate crystallization process are improved, and meanwhile the particle size of the ammonium polyvanadate is increased.

This invention discloses a method for the mass production of sodium polyvanadate nanowires. The method includes: adding a sodium vanadium extraction leachate to an inorganic acid to hydrolyze and precipitate vanadium, obtaining a hydrated sodium polyvanadate nanowire dispersion; obtaining hydrated sodium polyvanadate nanowires by vacuum filtration or pressure filtration of the hydrated sodium polyvanadate nanowire dispersion; and drying and high-temperature annealing the hydrated sodium polyvanadate nanowires to obtain sodium vanadium oxide nanowires. This nanofiberization process is rapid, simple, and operates under mild conditions. It allows for scalable containers, uses inexpensive and environmentally friendly dispersant (industrial water), and is suitable for large-scale production under conditions such as mechanical stirring and normal pressure. This technology breaks through the conventional thinking of ordinary technicians, overcomes the technical prejudices of traditional nanomaterial preparation, especially sodium polyvanadate nanowires, overcomes the shortcomings of existing hydrothermal synthesis or preparation techniques, solves long-standing technical problems, and achieves unexpected results.

The invention discloses a method for liquid-phase decomposition of vanadium slag under low alkalinity. The method comprises the following steps: preparing a sodium hydroxide solution; adding vanadium slag into the sodium hydroxide solution, and uniformly stirring to obtain a mixed solution; adding the mixed solution into a high-pressure reaction kettle, and controlling the reaction temperature, the reaction pressure, the reaction time, the oxygen rate and the rotating speed; after the reaction is finished, the mixed solution is filtered while hot, a mixed solution of sodium vanadate and sodium chromate is obtained, vanadium and chromium in the vanadium slag are recycled into the mixed solution of sodium vanadate and sodium chromate respectively, and the purpose of recycling vanadium and chromium resources is achieved. Compared with the high temperature required by the traditional sodium salt roasting process, the reaction temperature is reduced by more than 600 DEG C, and the energy consumption is obviously reduced. The method has high vanadium and chromium resource utilization rate. After liquid-phase oxygenolysis, the content of vanadium in the tailings is 1-2 wt%, and the content of chromium is 2-3 wt%. According to the method, comprehensive high-value utilization of vanadium and chromium resources is achieved, meanwhile, generation of hazardous waste is reduced, and a high-efficiency and low-cost green production process system is constructed.

The utility model discloses a device for preparing ammonium polyvanadate by continuously crystallizing a sodium vanadate solution. The device comprises a premixing tank, a liquid storage tank, a reaction kettle and a filter press, the premixing tank is provided with a sodium vanadate solution inlet, an ammonium sulfate inlet and a sulfuric acid inlet, an outlet of the premixing tank is communicated with an inlet of the liquid storage tank, an outlet of the liquid storage tank is communicated with an inlet of the reaction kettle, and an outlet of the reaction kettle is communicated with an inlet of the filter press; the reaction kettle is provided with a heating structure and a sulfuric acid inlet. According to the device, the pre-mixing tank is independently arranged, the process in the pre-mixing tank is controlled in the use process, so that no crystal precipitate is generated in the pre-mixed vanadium liquid, and the crystallization process is performed in the reaction kettle through the transition of the liquid storage tank, so that the stability of the ammonium polyvanadate crystallization process can be improved, and the particle size of the ammonium polyvanadate can be increased to reduce the cleaning difficulty; the stability and purity of the ammonium polyvanadate in the crystallization process are improved, and meanwhile the particle size of the ammonium polyvanadate is increased.

This invention belongs to the field of battery cathode material technology, specifically relating to an Al 3+ Sodium vanadate-coated nanocomposites, their preparation methods, and applications. The Al... 3+ Sodium vanadate-coated nanocomposite material, made of Al 3+ The sodium vanadate is coated to obtain the product. The vanadium in the sodium vanadate is pentavalent. Under bridging and coordination, the pentavalent vanadium self-assembles to form a polynuclear vanadium-oxygen cluster anion [V6O]. 16 ] 2‑ Al 3+ [V6O] on the surface of sodium vanadate 16 ] 2‑ The formation of surface complexes of the type =Al-O-V≡ coats sodium vanadate, forming Al 3+ Vanadic acid-coated nanocomposite materials. The Al of this invention... 3+ @NVO has a stable structure, and the batteries made from it have high discharge capacity and high rate performance.

The invention discloses a method for preparing high-purity vanadium pentoxide from acidic calcified vanadium liquid, which comprises the following steps: adding ammonia water into the acidic calcified vanadium liquid to adjust the pH value, adjusting the pH value to 6-8, reacting, settling to obtain vanadium-containing precipitate, washing the vanadium-containing precipitate once, re-dissolving to remove impurities, and removing impurities and calcium through calcium salt to obtain purified vanadium liquid. And finally, cooling and precipitating to obtain sodium metavanadate, and calcining the sodium metavanadate to prepare a high-purity vanadium pentoxide product. According to the method, the acidic calcified vanadium liquid serves as the raw material, vanadium and impurities Mn, Ca, Si, P, K and Na are fully separated through two-stage precipitation-dissolution and efficient chemical impurity removal, the high-purity vanadium pentoxide product with the purity reaching 99.9% or above is prepared, the process is simple, the cost is low, and development of the vanadium slag calcification vanadium extraction process is greatly promoted.

The invention relates to the field of bone repair, and discloses a 3D printing bone-imitating biological scaffold and a preparation method thereof.The preparation method comprises the steps that firstly, ammonium bromide is added into a mixture of deionized water and absolute ethyl alcohol, and an ammonium bromide solution is obtained; sequentially adding an ammonia solution, tetraethoxysilane, triethyl phosphate, calcium nitrate and sodium vanadate, continuously stirring, centrifuging, and collecting a precipitate; washing, aging, heating, cooling, grinding, crushing, and screening to obtain V-MBG powder; preparing a TA solution and a V-MBG solution, mixing and putting the TA solution and the V-MBG solution, and freeze-drying to obtain TA-coated V-MBG powder; preparing a trichloromethane solution of PLGA (poly (lactic-co-glycolic acid)), adding the V-MBG powder, fully stirring, and pumping out the trichloromethane solution to obtain solid slurry; printing an inner-layer stent and a hollow-tube outer-layer stent to obtain a bone-imitating biological stent, and soaking the bone-imitating biological stent in a TA solution to obtain a PLGA / TA-V-MBG composite stent; the problems that in the prior art, the bone repairing effect is poor, the bone-like cell proliferation and differentiation effect is poor, and bone defect repairing caused by bone tumor treatment cannot be achieved are solved.

The invention relates to a method for preparing vanadium pentoxide by using vanadium-rich liquid with relatively high impurity content. According to the technical scheme, the method comprises the following steps: adding a hydrogen peroxide solution into the vanadium-rich liquid with relatively high impurity content to obtain a pretreatment solution; the pH value of the pretreatment solution is reduced through a precipitator, first stirring is conducted, solid-liquid separation is conducted, and iron-containing precipitates and a vanadium-containing solution are obtained; and oxidizing the potential of the vanadium-containing solution to-1100 to-1000 mV by using an oxidizing agent to obtain a pentavalent vanadium solution, and carrying out secondary stirring and solid-liquid separation on the pentavalent vanadium solution to obtain sodium polyvanadate and a vanadium precipitation mother solution. And mixing the detergent with sodium polyvanadate, stirring for the third time, and carrying out solid-liquid separation to obtain ammonium polyvanadate and washing waste liquid. And calcining the ammonium polyvanadate at the temperature of between 500 and 550 DEG C for 30 to 60 minutes, so as to obtain the vanadium pentoxide. The method has the characteristics of good impurity removal effect, low ammonium consumption and environmental friendliness, and the prepared vanadium pentoxide is high in purity.

The application relates to the technical fields of biological medicine, nanomaterials and food safety, and particularly relates to a preparation method of a Ce6-mediated photodynamic sterilization film and application of the Ce6-mediated photodynamic sterilization film to fresh food preservation. The Ce6-mediated photodynamic sterilization film is prepared by the following method: yttrium nitrate, europium nitrate and bismuth nitrate are dissolved in deionized water, and then mixed with sodium vanadate; the mixed solution is subjected to hydrothermal reaction in a polytetrafluoroethylene reaction kettle; the product after the hydrothermal reaction is mixed with Ce6 and centrifuged to obtain Ce6-mediated nanomaterials; the nanomaterials have photosensitizer activity and can be used for inhibiting bacteria and fungi; the nanomaterials are dissolved in CMC, stirred and dried on a glass plate to obtain the Ce6-mediated photodynamic sterilization film. The Ce6-mediated photodynamic sterilization film generates active oxygen under ultraviolet light and has UV blocking function, can be used for photodynamic antibacterial and fresh food preservation, and realizes the double effects of UV sterilization and food loss prevention.