2290 results about "Vanadium atom" patented technology

A vacuum insulating panel may include: a first substrate; a second substrate; a plurality of spacers provided in a gap between at least the first and second substrates, wherein the gap is at pressure less than atmospheric pressure; a pump-out / evacuation tube extending at least partly into an aperture in one of the substrates; and a pump-out / evacuation tube seal. The pump-out / evacuation tube seal may include at least one of: (a) from about 20-80 wt. % tellurium oxide, the tellurium oxide comprising TeO4 and TeO3, wherein the pump-out tube seal comprises more TeO3 than TeO4 by wt. %; and / or (b) tellurium oxide and from about 10-50 wt. % vanadium oxide, wherein the pump-out tube seal by wt. % comprises more tellurium oxide than vanadium oxide, and wherein the vanadium oxide comprises VO2 and V2O5, and wherein more V in the pump-out tube seal is in a form of VO2 than V2O5. A substantially donut-shaped laser beam may be used to heat pump-out tube material in order to form a pump-out tube seal.

The invention discloses a light-operated reconfigurable metasurface for full-space terahertz wave beam regulation and control, solves the problem of how to provide ubiquitous full-space wave beam coverage for multi-user wireless communication application, and belongs to the field of artificial electromagnetic metamaterials. The super subunit comprises N super subunits which are arranged periodically, each super subunit comprises 4 * 4 identical coding units, corresponding codes are '0' and '1' respectively when illumination exists or not, and the phase response difference of the two coding units at 0.7 THz is 180 degrees. Each super subunit comprises five layers, the third layer is used for switching between reflection and transmission, when vanadium dioxide is in a medium state, the super surface is in a transmission mode, and when vanadium dioxide is in a metal state, the super surface is in a reflection mode. The first layer, the second layer, the fourth layer and the fifth layer are used for controlling the amplitude and the phase of the total-space terahertz wave, the conductivity of the photosensitive silicon pattern is changed under excitation of light with different intensities, the phase of the total-space terahertz wave beam is effectively modulated, and one-bit terahertz information coding is achieved.

The invention discloses a ternary magnetic selenide and a preparation method of a single crystal of the ternary magnetic selenide, and relates to the technical field of crystal material preparation. The chemical formula of the ternary magnetic selenide is VCrSe3, and the ternary magnetic selenide can be prepared by taking a vanadium source, a chromium source and a selenium source in a specific proportion as raw materials and an iodine source as a transport agent through a chemical vapor transport method. The crystal structure of the VCrSe3 single crystal is a monoclinic phase (I2 / m), and phase transformation from antiferromagnetic to ferromagnetic and spin reorientation occur at low temperature, so that the VCrSe3 single crystal has application potential in the fields of spintronics, optoelectronics and the like; the large-size and high-quality VCrSe3 single crystal prepared by the method can provide a material for intrinsic physical property research and development of functional devices such as optoelectronic devices and spinning electrons.

The invention discloses a high-capacity positive electrode electrolyte for all-vanadium liquid flow batteries, wherein the electrolyte contains a solid energy storage material with a concentration of 0.02-1 g / mL, and the main component is a targeted redox solid energy storage material containing ammonia-rich iron / copper ferrocyanide, which reacts with a positive electrode redox medium VO in a supporting electrolyte containing ammonium ions. 2+ / VO2 + With similar equilibrium potential, reversible redox reaction can occur to continue the charge and discharge process. The high-capacity all-vanadium liquid flow battery positive electrode electrolyte disclosed in the present invention uses low-cost solid energy storage materials as the main energy storage medium, so when using a lower positive electrode redox medium VO 2+ / VO2 + High capacity and energy can be achieved at low concentrations, and pentavalent vanadium VO2 + The concentration can enhance the temperature adaptability of the all-vanadium liquid flow battery system while reducing the electrolyte cost.

The composition general formula of the vanadium-based hydrogen storage alloy is VxTiyCrzCCe, x is larger than or equal to 0.7 and smaller than or equal to 0.8, y is larger than or equal to 0.04 and smaller than or equal to 0.1, z is larger than or equal to 0.1 and smaller than or equal to 0.18, x + y + z = 1, and a is larger than or equal to 0.001 and smaller than or equal to 0.005. The prepared vanadium-based hydrogen storage alloy has the advantages that the preparation process is simple, the hydrogen storage alloy which is easy to activate, high in capacity and good in cycling stability can be obtained by adding trace Ce, and the vanadium-based hydrogen storage alloy is suitable for large-scale generation preparation and commercial application. The alloy is prevented from being locally oxidized in the smelting process due to a small amount of Ce element, and the problem that the hydrogen absorption capacity is reduced due to excessive rare earth elements is avoided, so that the activation performance of the alloy is improved, and meanwhile, the high hydrogen storage capacity is obtained.

The invention relates to a crystallization method of ammonium metavanadate crystals. The crystallization method comprises the following steps: cooling an ammonium metavanadate concentrated solution to obtain an ammonium metavanadate supersaturated solution; the cooling treatment process comprises the step of adding a crystallization regulating agent into the ammonium metavanadate concentrated solution; sequentially carrying out aging treatment and solid-liquid separation on the ammonium metavanadate supersaturated solution to obtain an ammonium metavanadate solid phase; by adding a crystallization regulating agent in the cooling treatment process, regulating the growth rate and growth direction of ammonium metavanadate crystals, matching with the steps of aging treatment and the like, the crystallization rate of the crystallization method is improved, preferably, the crystallization rate is up to 89.5% or above, and the high-purity ammonium metavanadate product with large grain size and regular morphology is obtained. Wherein the median particle size preferably reaches up to 86.5 microns or above, the purity reaches up to 99.97% or above, and the requirement for high-quality vanadium products at present is met.

The invention discloses a vanadium-doped modified ferric sodium pyrophosphate material based on spray drying as well as a preparation method and application of the vanadium-doped modified ferric sodium pyrophosphate material. The material has a spherical porous morphology, and the particle size is 1-10 microns; the chemical formula is Na (4-x) Fe (3-x) Vx (PO4) 2P2O7, wherein x is more than 0 and less than or equal to 0.1. The material is prepared by adopting a spray drying method, and atomic-scale mixing of vanadium and iron is ensured through a uniform and stable complexing ion solution; and the formation of porous spherical morphology is promoted through the volatilization of the acidic base solution in the rapid drying process. A spray drying method and a trace vanadium doping technology are combined, so that more active sodium sites in the ferric sodium phosphate pyrophosphate positive electrode material can be activated, the reversible de-intercalation sodium capacity can be improved, sodium ion diffusion can be promoted, the polarization voltage can be reduced, and the cycling stability of the material can be improved.

The invention relates to the technical field of catalyst preparation, and discloses a vanadium-based catalyst and a preparation method and application thereof. The vanadium-based catalyst comprises modified diatomite, an active component and an auxiliary active component, wherein the active component and the auxiliary active component are loaded on the modified diatomite; wherein the content of crystalline SiO2 in the modified diatomite is not less than 90%, the active component comprises vanadium pentoxide, and the auxiliary active component comprises potassium sulfate. The vanadium-based catalyst is an anti-resistance vanadium-based catalyst, the filling amount of the catalyst is small, and the filling amount of the catalyst can be reduced by 35% on the premise that the same performance is achieved, so that the pressure drop of a sulfuric acid device is greatly reduced, the total conversion rate of SO2 is guaranteed, and the method is particularly suitable for a production device for preparing sulfuric acid through waste acid cracking with high raw material gas impurity content; and the method has great advantages on long-period operation.

The invention provides a metallurgical process optimization method and system for a low-oxygen low-nitrogen aluminum-vanadium alloy, and relates to the technical field of process optimizing.The method comprises the steps that correlation characteristics among process parameters are extracted through a three-layer gating map attention network, and a parameter coupling state vector is constructed in combination with a time sequence attention module; constructing a process prediction model based on the state vector, and fusing a thermodynamic equilibrium equation and a long-short term memory network to predict the oxygen and nitrogen content; a deep reinforcement learning network of a Soft Actor-Critic algorithm is adopted, the parameter coupling state vector and the oxygen and nitrogen content prediction value serve as state input, and the technological parameter adjustment amount is output; and planning and iteratively training a future adjustment strategy through Monte Carlo tree search to finally obtain an optimal process parameter combination meeting oxygen and nitrogen content constraints, thereby realizing intelligent optimization control of the metallurgical process.

The invention relates to a bismuth-containing modified electrolyte, an all-vanadium redox flow battery and a preparation method and application of the all-vanadium redox flow battery, and belongs to the technical field of all-vanadium redox flow batteries. The bismuth-containing modified electrolyte comprises a vanadium electrolyte, bismuth salt is added into the vanadium electrolyte to serve as a catalyst, and a hydroxyl carboxylic acid complexing agent is added; the molar ratio of the bismuth salt to the hydroxycarboxylic acid complexing agent is (6-8): (0.6-0.8). According to the invention, the catalyst and the complexing agent are added into the electrolyte, the Bi elementary substance is deposited on the electrode through the charging process of the battery, the active sites of the electrode are increased, and the energy efficiency of the battery is improved. Meanwhile, the catalyst can improve the capacity retention ratio of the flow battery, greatly simplify the process steps and reduce the cost.

Alloy elements are reasonably matched, N and nitrides are added to form elements such as tungsten W, vanadium V, niobium Nb, cobalt Co, rare earth RE and the like for microalloying smelting, a forged and rolled material finished product is subjected to proper heat treatment, and the stainless steel subjected to heat treatment has good heat treatment performance through metallographic observation. According to the stainless steel, nanoscale carbides are separated out in a solid solution state, and fine particles mainly containing nitrides are dispersed and separated out in crystals in a thermodynamic state, so that the material is strengthened and does not diffuse to a crystal boundary, and the room-temperature mechanical property and the high-temperature mechanical property of the material are greatly improved; and when the stainless steel material produced by the method is used for manufacturing related products, the thickness of the stainless steel material can be reduced, and the overall input of the stainless steel material is greatly reduced, so that the large-scale application of noble metal strategic resource nickel is saved, and the aims of saving resources, energy and investment are fulfilled.

The invention discloses a highly active graphite felt for vanadium battery and a preparation method thereof, and belongs to the technical field of all-vanadium liquid flow battery electrodes. The method comprises the following steps: electrodepositing a layer of polymer on the graphite felt, then hydrothermally loading metal molybdenum, chelating the metal molybdenum with phytic acid, and finally pyrolyzing at high temperature to obtain a graphite felt loaded with an organic skeleton-metal oxide-organic skeleton hierarchical structure. The hierarchical structure is not only conducive to increasing the specific surface area and active sites of the graphite felt, but also can protect the metal catalyst from falling off or being consumed under long-term catalytic reaction and electrolyte flushing.

The invention provides a green and efficient petroleum passivator and a preparation method thereof, and belongs to the technical field of passivators. Carboxymethyl chitosan, phytic acid and beta-cyclodextrin are coupled to prepare a chitosan-phytic acid-cyclodextrin compound, bismuth, lanthanum, cerium and aluminum are compounded, and the green and efficient petroleum passivator is prepared through tannic acid polymerization modification. The prepared green and efficient petroleum passivator is green, safe, non-toxic and efficient, has good capturing and passivating capacity on ions such as iron, nickel and vanadium, greatly improves the activity of a catalyst, prolongs the service life of the catalyst, and has wide application prospects.

The invention discloses a short-process preparation method and application of a vanadyl sulfate electrolyte based on vanadium slag valence regulation and control, and belongs to the technical field of vanadium electrolytes. The method comprises the following steps: leaching the vanadium slag by using sulfuric acid to obtain a leaching solution containing low-valence vanadium; extracting vanadium and chromium in the leachate by adopting an amine organic extraction agent; carrying out reverse extraction by using sulfuric acid; the method comprises the following steps of: firstly, extracting and separating vanadium by using a phosphoric acid extracting agent, and finally, carrying out reverse extraction by using sulfuric acid to obtain the vanadium electrolyte which can be used for constructing a VFB-5kW / 10kWh vanadium battery energy storage system. The traditional established thinking that pentavalent vanadium is extracted through vanadium slag oxidation to serve as a vanadium source to prepare the vanadium electrolyte is broken through, the novel technology for extracting the low-valence vanadium solution from the vanadium slag to directly prepare the vanadium electrolyte is provided, the short-process and green novel technology for preparing the vanadium electrolyte from the vanadium slag is constructed, the efficiency of the vanadium electrolyte preparation technology is improved, and the preparation cost is reduced.

The invention relates to the field of chemical engineering and steel smelting, and discloses a method for extracting vanadium by top-blowing nitrogen-oxygen mixed gas, which comprises the following steps: S1, measuring the temperature of overline-crossing molten iron, sampling, and testing and analyzing the components of the molten iron; s2, measuring the temperature of the molten iron mixed into the converter; s3, according to the temperature measurement result in the S1 and the temperature measurement result in the S2, the charging temperature is corrected; s4, according to the corrected charging temperature, the proportion of the mixed gas is adjusted in a staged mode for blowing; s5, adding a coolant and pig iron into the furnace according to an analysis result in S1; and S6, after blowing is completed, slag and steel are separated, and vanadium slag and low-residue vanadium semisteel are obtained. According to the scheme, in order to solve the problems that in an existing vanadium extraction process, the temperature of a molten pool rises too fast, the stirring effect is insufficient, and the vanadium oxidation rate is limited, the recovery rate of vanadium is increased and the content of residual vanadium in semi-steel is reduced by accurately controlling the nitrogen-oxygen mixed blowing proportion, reasonably distributing the blowing time and combining heat balance calculation and end point control; and meanwhile, molten steel quality and subsequent steelmaking process requirements are guaranteed.

The invention relates to the technical field of new energy storage, in particular to electric pile temperature monitoring and control equipment of an all-vanadium redox flow energy storage system. The system is composed of a distributed temperature sensing array, a multi-parameter coupling analysis module, a self-adaptive temperature regulation and control system, a main control unit, a double-circulation heat management framework and a fault diagnosis module. The control method comprises the following steps: establishing a pile three-dimensional temperature field reference model; monitoring temperature distribution and electrolyte parameters in real time; calculating an efficiency loss coefficient caused by the local temperature difference; dynamically adjusting the refrigeration power and the pump set rotating speed; and executing temperature balance degree verification and system self-inspection. The invention provides an electric pile temperature management scheme integrating high-precision three-dimensional temperature monitoring, multi-parameter dynamic coupling regulation and control and intelligent fault diagnosis so as to solve the problems of monitoring blind areas, regulation and control delay, insufficient risk prediction capability and the like in the prior art, thereby improving the operation efficiency and safety of an all-vanadium redox flow energy storage system.

The invention discloses a selective separation and resource utilization method of chromium in a sodium vanadium solution, which comprises the following steps: S1, measuring a predetermined volume of sodium vanadium solution, and heating to a predetermined temperature; s2, a preset amount of divalent manganese salt is added into the sodium vanadium solution, so that hexavalent chromium is subjected to a reduction reaction; s3, after the reaction is finished, carrying out solid-liquid separation and washing to obtain chromium and vanadium removed liquid and precipitates; s4, vanadium precipitation and calcination are conducted on the chromium and vanadium removal liquid, and a vanadium oxide product is obtained; and calcining the precipitate at high temperature to obtain the chromium-manganese oxide. According to the method, the sodium vanadium solution is used as a raw material, the divalent manganese salt is used as a reducing agent, hexavalent chromium is reduced into trivalent chromium, the trivalent chromium generates chromium hydroxide precipitate under the alkaline condition, vanadium is not reduced and is reserved in the solution, and efficient separation of vanadium and chromium is achieved; the dechromed vanadium liquid is subjected to vanadium precipitation and calcination, and a vanadium oxide product is obtained; after the precipitate is subjected to high-temperature calcination, chromium-manganese oxide is obtained and can be used for preparing chromium-manganese alloy, and resource utilization is achieved.

The invention relates to the technical field of vanadium pentoxide preparation, and particularly discloses a preparation method of high-purity vanadium pentoxide, which comprises the following steps: S1, vanadium slag pretreatment: carrying out microwave activation on vanadium slag, and then carrying out ball milling and roasting to obtain clinker; the sulfuric acid-oxalic acid composite acid and the clinker are mixed and leached, the pH is adjusted after leaching is completed, and vanadium-containing leachate is obtained through filtering; s3, vanadium enrichment: heating the vanadium-containing leachate, adding a sodium carbonate solution while stirring, adjusting the pH value, preserving heat and curing, and then carrying out hot filtration to obtain vanadium-rich filter residues; s4, vanadium purification: mixing the vanadium-rich filter residues with a sodium hydroxide solution, stirring, introducing compressed air while stirring, and carrying out hot filtration after the reaction is finished, so as to obtain vanadium-rich filtrate; and S5, calcining: carrying out two-stage calcining on the ammonium metavanadate precursor to obtain high-purity V2O5. The preparation method is high in vanadium recovery rate, and the purity of the prepared V2O5 is 99% or above.

The invention provides a method for preparing a vanadium electrolyte by using aluminum oxide seed precipitation mother liquor crystallization vanadium slag, which comprises the following steps: carrying out reduction acid leaching on Bayer process seed precipitation mother liquor crystallization vanadium slag, converting V (V) and As (V) into V (IV) and As (III), adding an arsenic removal precipitator for arsenic removal, and further hydrolyzing to obtain VO (OH) 2; vO (OH) 2 is converted into a pentavalent vanadate solution through oxidation alkaline leaching, impurity ions such as arsenic, phosphorus, aluminum and silicon are further removed through multiple times of crystallization, and high-purity vanadate is obtained; and finally, high-purity vanadate is converted into a V (IV) solution through reduction acid leaching, an arsenic removal precipitator is added again, deep arsenic removal is achieved, VO (OH) 2 is obtained through hydrolysis, and VOSO4 electrolyte is prepared through sulfuric acid dissolution.

The invention belongs to the field of hydrometallurgy, and particularly discloses a high-purity vanadium oxide electrode and a preparation method thereof. The method comprises the following steps: pre-treating the alkaline vanadium leaching solution by using an activated aluminum oxide adsorption column to obtain a pre-treated solution; adding a composite impurity removal agent taking modified lignosulfonate as a main agent into the pretreatment liquid for primary impurity removal to obtain primary impurity-removed filtrate; adding a calcium hydroxide suspension and a flocculating agent into the primary impurity-removed filtrate for secondary impurity removal to obtain secondary impurity-removed filtrate; purifying the secondary impurity-removed filtrate by using an ion exchange column to obtain a purified solution; ammonium salt is added into the purified liquid for vanadium precipitation, and ammonium metavanadate crystals are obtained; calcining the ammonium metavanadate crystal to obtain high-purity vanadium pentoxide; and preparing the high-purity vanadium oxide electrode by using the high-purity vanadium pentoxide. According to the scheme, the high-purity vanadium pentoxide is prepared by taking the alkaline vanadium leaching solution as a raw material through a multi-stage deep impurity removal process, and the high-purity vanadium oxide electrode is prepared by taking the alkaline vanadium leaching solution as the raw material.

The invention relates to the technical field of redox flow batteries, in particular to an all-vanadium redox flow battery electrolyte based on bromo-hydrochloric acid and application of the all-vanadium redox flow battery electrolyte. The electrolyte comprises vanadium ions, hydrogen ions, bromide ions and chloride ions, wherein the molar concentration ratio of the chloride ions to the bromide ions is greater than or equal to 2; and the volume ratio of the positive electrode electrolyte to the negative electrode electrolyte is (0.5-0.95): 1. According to the electrolyte disclosed by the invention, on the basis of fully utilizing the capacity provided by vanadium, the capacity provided by bromine is effectively utilized through participation of bromine ions in an electrochemical reaction, so that the capacity of the all-vanadium redox flow battery is improved, and meanwhile, the energy cost is reduced; the electrolyte can improve the high-temperature stability of the all-vanadium redox flow battery.

The invention relates to the field of chemical industry, and discloses a method for preparing high-purity vanadium oxide by purifying ammonium vanadate, which comprises the following steps: adding a carbonate solution into ammonium vanadate, stirring, and heating to 75-95 DEG C to obtain a vanadium-containing return solution; keeping the temperature of the vanadium-containing return solution, and adding a calcium salt impurity removal agent to obtain a vanadium-containing purified solution and first-stage impurity removal slag; oxalate is added into the vanadium-containing purified liquid, the temperature of the vanadium liquid is kept, and deeply-purified vanadium liquid and second-stage impurity removal slag are obtained; cooling the deeply purified vanadium liquid to 5-35 DEG C, stirring and reacting, and then carrying out solid-liquid separation to obtain ammonium metavanadate and secondary vanadium precipitation supernatant; adding pure water into the ammonium metavanadate product, pulping, stirring, and heating to 80-95 DEG C to obtain a secondary return solution; the pH of the secondary return solution is adjusted to 1.6-2.0, the temperature is raised to 95-98 DEG C, and ammonium polyvanadate and a third-section vanadium precipitation supernatant are obtained; and drying the ammonium polyvanadate, raising the temperature to 500-600 DEG C in an oxidizing atmosphere, and carrying out heat preservation and calcination to obtain a vanadium pentoxide product. The method can be used for preparing a high-purity vanadium pentoxide product.

The invention discloses a stone coal vanadium extraction method, and belongs to the technical field of stone coal vanadium extraction, and the method comprises the following steps: crushing stone coal vanadium ore, and simultaneously carrying out microwave irradiation to obtain an activated sample; immersing the activated sample and an oxidizing agent solution into an acid solution, heating and reacting to obtain a suspension, and carrying out solid-liquid separation to obtain a leachate; then, vanadium in the leachate is adsorbed and enriched through ion exchange resin containing quaternary ammonium groups, and an enriched vanadium solution is obtained through desorption with alkali liquor; then adjusting the pH value of the enriched vanadium liquid, adding an impurity removal agent, uniformly stirring, standing, and carrying out solid-liquid separation to obtain a purified liquid; finally, a precipitator is added into the purified liquid, solid-liquid separation is carried out after the reaction is completed, and the ammonium polyvanadate product is obtained.The method not only can remarkably reduce energy consumption, but also can effectively improve the purity of ammonium polyvanadate.

The invention discloses a composite thermochromic window with a dual-band dynamic regulation and control function. The composite thermochromic window comprises a first transparent substrate, a tungsten-doped vanadium dioxide film, a second transparent substrate and a hydrogel layer. The tungsten-doped vanadium dioxide film is deposited on the upper surface of the first transparent substrate, and the phase transition temperature is 25-32 DEG C; the hydrogel layer is thermo-sensitive poly (N-isopropylacrylamide) and is encapsulated between the two transparent substrates, and the low critical phase transition temperature is 32 + / -2 DEG C. When the temperature is lower than 25 DEG C, the infrared transmittance of the tungsten-doped vanadium dioxide film is larger than or equal to 75%, and the visible light scattering rate of the hydrogel layer is smaller than or equal to 10%; when the temperature is higher than 32 DEG C, the near-infrared transmittance of the tungsten-doped vanadium dioxide film is reduced to the minimum value, and the visible light scattering rate of the hydrogel layer is increased to 35% or above. Compared with the prior art, the system and the method have the advantages that dual-band dynamic regulation and control of visible light and near-infrared light are achieved, the indoor photo-thermal environment can be automatically regulated according to the environment temperature, and the building energy utilization efficiency is improved.

The invention discloses a functionalized carbon quantum dot modified all-vanadium redox flow battery electrolyte. The functionalized carbon quantum dot has a large specific surface area and a carboxyl functional group on the surface; the electrolyte of the flow battery is a dilute sulfuric acid solution of vanadium; the main evaluation indexes of the electrochemical performance are the cycle efficiency, the capacity retention ratio and the battery performance of the electrolyte; the invention aims to discuss the catalytic action of the surface functional groups of the functionalized carbon quantum dots on the oxidation-reduction reaction of vanadium ions in the electrolyte of the all-vanadium redox flow battery by using the functionalized carbon quantum dots as an additive of the electrolyte. Meanwhile, the influence of the concentration and doping of the carbon quantum dots on the electrochemical performance of the electrolyte of the all-vanadium redox flow battery is researched, so that the working efficiency and the overall performance of the battery are improved, the characteristics of the electrolyte are improved, and the energy consumption of the battery is reduced.

The invention provides a preparation method of a vanadium electrolyte for an all-vanadium redox flow battery, the vanadium electrolyte and application. The method comprises the following steps: (1) dissolving concentrated sulfuric acid in water to obtain a sulfuric acid solution with a preset concentration, then adding vanadium pentoxide into the sulfuric acid solution, and reacting to obtain a first vanadium solution; (2) the temperature of the first vanadium solution is kept to be the preset temperature, low-valence vanadium oxide is added into the first vanadium solution for reaction, water or hydrochloric acid is supplemented in the reaction process, a second vanadium solution is obtained, and the low-valence vanadium oxide is vanadium oxide with the valence of 3-3.5; and (3) filtering the second vanadium solution to obtain the vanadium electrolyte. The method provided by the invention can save energy consumption, reduce cost and improve dissolution efficiency.

The invention discloses a method for removing impurities and extracting vanadium from calcification roasting vanadium slag leachate, which comprises the following steps: S1, adding water and a leaching agent into calcification roasting vanadium slag clinker, and uniformly mixing to obtain first ore pulp, the leaching agent at least comprising triethanolamine, potassium sodium tartrate and acid liquor; s2, the pH value of the first ore pulp is adjusted to be 1-6, leaching is conducted under the preset leaching condition, and second ore pulp is obtained; and S3, the second ore pulp is filtered, and vanadium-containing leaching liquid and leaching residues are obtained. According to the method, impurity ion magnesium in the solution is complexed with triethanolamine to generate precipitates during leaching, so that the impurity ions are removed, the obtained leaching solution is low in impurity content and can be directly used for subsequent vanadium precipitation, the magnesium precipitates are flocculent, the leaching slag tailings of vanadium are granular, metals such as magnesium can be separated and recycled, and maximization of economic benefits is realized.

The invention discloses a vanadium-based neutron transparent alloy material and a preparation method thereof, the alloy is a disordered solid solution of a body-centered cubic structure formed by a single crystal phase, the chemical composition is V < 1-x > Mx, x is less than 0.1, V is a metal element vanadium, and M is selected from one or more of Al, Nb, Ta, Fe, Sn or Mo. According to the alloy, neutron diffraction peaks generated by metal vanadium can be effectively eliminated while a metal vanadium body-centered cubic crystal structure is not damaged, the neutron transparent alloy material is successfully prepared, the process is simple and feasible, the formula has diversified choices, multiple novel double-element vanadium-based neutron transparent alloys are prepared, and the neutron transparent alloy material has good application prospects. In addition, the multi-element vanadium-based transparent neutron alloy is prepared for the first time, all the materials have excellent chemical and mechanical properties, and compared with an existing Ti2.08Zr alloy, the multi-element vanadium-based transparent neutron alloy has better high-temperature chemical stability.

The present invention proposes a light-absorbing film and a preparation method and application thereof, including a preparation method of a copper-vanadium-sulfur / copper-vanadium-selenium / copper-vanadium-sulfur-selenium light-absorbing film based on a solution method, and an application of the light-absorbing film prepared by the method on a solar cell. The preparation method is simple to operate and low in cost. Thioglycolic acid and ethanolamine are used as ligands, and ethylene glycol methyl ether is used as a solvent to adjust the viscosity to prepare a precursor solution; a copper-vanadium-sulfur / copper-vanadium-selenium / copper-vanadium-sulfur-selenium film is prepared by spin coating-sintering mode and adjusting the feed ratio of elements; high-temperature heat treatment is continued for sulfurization / selenization reaction to obtain a large-grain through-type copper-vanadium-sulfur / copper-vanadium-selenium / copper-vanadium-sulfur-selenium film, which can avoid the generation of impurities in the film, and the prepared light-absorbing film is applied to the light-absorbing layer of a solar cell, which is conducive to assembling a copper-vanadium-sulfur-selenium thin film solar cell with high photoelectric conversion efficiency.

The invention discloses a bifunctional chiral metamaterial surface capable of switching polarization conversion and wave absorption, and belongs to the technical field of electromagnetic metamaterials. The method is used for solving the problem that most existing chiral super-structure surfaces cannot realize dynamic adjustability and quantitative controllability and cannot have dual functions of polarization conversion and wave absorption at the same time. The super-structure surface unit structure is composed of a graphene film layer, a gold-vanadium dioxide resonance layer, a silicon dielectric layer and a bottom-layer continuous gold film. Switching of two functions of polarization conversion and wave absorption is realized by changing the conductivity of vanadium dioxide; polarization conversion and dynamic regulation and control of the wave absorbing efficiency are realized by changing the Fermi level of the graphene; quantitative controllability of polarization conversion and a wave absorbing function is realized by controlling a function weighting function. Besides, the chiral super-structure surface also has the advantages of incident angle robustness, small thickness and small size, has double functions of broadband, and has potential application value in the fields of optical devices, communication equipment, biomedical sensors and the like.