1377 results about "Vanadium atom" patented technology

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 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 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 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.

The invention discloses a KTP type sodium-rich phosphate positive electrode material and a preparation method and application thereof, the chemical formula of the phosphate positive electrode material is NaxV1-yTyPO4F1-zOz, 1 < x < = 2, 0 < y < = 1, and 0 < = z < = 1; the preparation method of the material comprises the following steps: adding a vanadium source, a T source, a phosphorus source and a fluorine source in a stoichiometric ratio into a reaction kettle containing a reaction solvent, adding an ammonium source to keep the pH value to be 6-10, maintaining the temperature to be 120-250 DEG C, and reacting for 2-24 hours; naturally cooling, and washing with clear water to obtain a (NH4) xV < 1-y > TyPO4F < 1-z > Oz precursor; the preparation method comprises the following steps: fully grinding an excessive sodium source and a (NH4) xV < 1-y > TyPO4F < 1-z > Oz precursor, carrying out Na < + > / NH4 < + > molten salt exchange in a tubular furnace at 60-400 DEG C for 1-48 hours, introducing inert gas during reaction, and washing an obtained product with a washing solvent after the reaction is finished to remove the excessive sodium source; and drying in a drying oven at 50-250 DEG C for 1-30 hours to obtain the KTP type sodium-rich phosphate positive electrode material. By utilizing the induction effect of KTP configuration on V-O or T-O bonds, the voltage of V and T transition metal related redox couple is increased, and the energy density is improved.

The invention discloses a carbon-coated high-entropy NASICON positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion battery electrode materials. The method comprises the following steps: adding a vanadium source, a carbon source, a chromium source, an iron source, a manganese source, a zinc source, an aluminum source, a sodium source and a phosphorus source into deionized water, heating and dissolving to obtain a clear solution; and heating the solution to form gel, and then carrying out the steps of vacuum drying, crushing, pre-sintering, calcining and the like to obtain the Na3V2-y (CrFeMnZnAl) y (PO4) 3 / C (0 < y < 1) positive electrode material. The positive electrode material has a stable NASICON structure, and the morphology is of a scaly structure. According to the invention, a high-entropy doping mode is adopted to replace part of vanadium sites in sodium vanadium phosphate, and the conductivity of the positive electrode material is improved through carbon coating, so that the prepared positive electrode material has relatively good cycling stability and rate capability.

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 a pressure less than atmospheric pressure; a seal provided between at least the first substrate and the second substrate, the seal comprising a first seal layer; wherein the first seal layer comprises tellurium oxide and vanadium oxide; wherein the first seal layer comprises, on a wt. %, more tellurium oxide than vanadium oxide, and has a density of from about 2.8-4.0 g / cm3.

The invention belongs to the technical field of vanadium enrichment mechanisms of phosphorus vanadium ores, and discloses a research method of a vanadium enrichment mechanism in a diagenetic stage of phosphorus vanadium ores, which comprises the following steps: S1, sample collection and treatment; s2, rock ore identification and mineral composition analysis; s3, analyzing the occurrence state and microcell morphology of vanadium; s4, performing geochemical analysis on the whole rock; s5, in-situ microcell geochemical analysis is carried out; s6, phosphorus nodule analysis; s7, comprehensive analysis and mineralization model establishment; according to the method, mineralogy, total rock geochemistry, micro-area surface scanning and other multi-scale and multi-means research methods are comprehensively utilized, and the vanadium occurrence state, the ore-forming fluid evolution and the phosphorus-vanadium coupling relation are finely described; in-situ microcell geochemical analysis is introduced into phosphorus nodule analysis, the internal structure, the growth sequence and element distribution of the phosphorus nodule are directly revealed, obvious frontier and systematicness are achieved, and reliable theoretical support is provided for accurate exploration of vanadium ore resources and green and efficient dressing and smelting process research and development.

The invention discloses a method for detecting the concentration of vanadium ions in an electrolyte of an all-vanadium redox flow battery, and relates to the technical field of batteries. The method for detecting the concentration of vanadium ions in the electrolyte of the all-vanadium redox flow battery comprises the following steps: preparing trivalent and tetravalent vanadium ion reference solutions and trivalent and tetravalent vanadium ion standard solutions with different concentrations; performing baseline correction by using a high-concentration reference solution, setting an absorbance difference value between a corresponding reference cell and a sample cell as 0, and obtaining a trivalent vanadium ion standard curve and a tetravalent vanadium ion standard curve by using standard solutions with different concentration gradients; and detecting the absorbance difference value of the electrolyte stock solution to be detected, and substituting the absorbance difference value into the corresponding standard curve to calculate the vanadium ion concentration. According to the present invention, the detection can be performed without diluting the electrolyte stock solution during the detection, the interference of the adjacent valence vanadium ions is not easily generated, and the detection result is accurate.

The invention belongs to the field of chemical engineering, and relates to a preparation method of a high-chroma bismuth vanadate pigment for a coating, which comprises the following steps: mixing a titanium-based ion sieve with an acidic vanadium leachate, filtering after the reaction is completed to obtain a first filtrate, adding mercaptoacetic acid into the first filtrate, and filtering after the reaction is completed to obtain a second filtrate; preparing a bismuth salt solution containing yttrium ions and zirconium ions, mixing the bismuth salt solution with the second filtrate, adjusting the pH value to be in linear gradient change from acidity to neutrality, heating to a first temperature at a set heating rate, aging, centrifuging and drying to obtain a precursor; and calcining the precursor at a second temperature to obtain the bismuth vanadate pigment. According to the method, the acid vanadium leaching solution is used as a raw material, and the bismuth vanadate pigment with high chromaticity and chemical stability is obtained while the production cost is reduced through an innovative ion sieve purification technology and lattice stabilization doping, so that the method has obvious economic benefits.

The invention belongs to the field of functional nano materials, and relates to a method for large-scale preparation of monoclinic phase vanadium dioxide nano powder, a heat insulation film and application of the heat insulation film, and large-scale preparation of the monoclinic phase vanadium dioxide nano powder is successfully achieved by combining a coprecipitation method with low-temperature calcination. The obtained product has excellent size uniformity (the average particle size is 65 + / -10 nm) and an adjustable phase change characteristic (61-68 DEG C). The polymer-based composite film prepared based on the nano powder shows excellent optical performance, and the method has the advantages of mild reaction conditions (less than or equal to 600 DEG C), controllable product morphology and phase transition temperature and the like, and provides a reliable solution for industrial production of nano functional materials for intelligent windows.

The invention discloses a preparation method of 5N specified-grade high-purity vanadium pentoxide, which comprises the following steps: step S1, taking high-purity ammonium metavanadate as a raw material, mixing the raw material with pure water in proportion, heating for dissolving, and cooling to obtain an ammonium metavanadate solution; s2, enabling the ammonium metavanadate solution to pass through a resin column for adsorption, and collecting column passing liquid; s3, carrying out vacuum concentration on the column passing liquid, cooling and crystallizing the obtained concentrated liquid, and carrying out suction filtration to obtain primary crystals; s4, mixing the primary crystal with pure water in proportion, heating, filtering, cooling filtrate, crystallizing, filtering and washing with water to obtain a secondary crystal; step S5, repeating crystallization operation for 1-3 times to obtain recrystallized ammonium metavanadate; and step S6, putting ammonium metavanadate into a porcelain baking tray, putting the porcelain baking tray into a calcining furnace, vacuumizing, calcining and cooling to obtain a 5N specified-grade high-purity vanadium pentoxide product. The method has the characteristics of simple principle, convenience in operation, high reliability and the like, and the purity of vanadium pentoxide is remarkably improved.

The invention relates to the technical field of electric power engineering, in particular to a non-step-in liquid cooling phosphoric acid and all-vanadium liquid flow energy storage power station cooperative control system in butt joint with a 220KV transformer substation. Comprising a hybrid energy storage module, a non-stepping intelligent liquid cooling module, a multi-strategy cooperative control module and a substation deep cooperative interface module. The multi-strategy cooperative control module is used for constructing a multi-stage cooperative control architecture, generating control strategies adapted to different operation scenes by fusing multi-source data, and realizing multi-module cooperative operation optimization; lithium iron phosphate and all-vanadium liquid flow energy storage units are connected in parallel through a direct-current bus, and a short-time high-power response-long-time deep energy storage characteristic complementary system is constructed; through cooperative operation of the hybrid energy storage module, limitation of a single battery type on power or capacity is avoided; a'monitoring-evaluation-response 'totally-closed active safety chain is formed, and the temperature can be kept stable and potential safety hazards can be eliminated without manual intervention in the whole process.

The invention discloses a V6O13 nano material and a preparation method and application thereof, and belongs to the technical field of aqueous zinc ion batteries, the preparation method of the V6O13 nano material comprises the following steps: taking V2O5 as a vanadium source, and adopting a hydrothermal method to prepare an intermediate product; and the intermediate product is subjected to annealing treatment, and the V6O13 nanometer material is obtained. According to the preparation method disclosed by the invention, a hydrothermal-annealing synergistic strategy is adopted, firstly, an intermediate product is prepared by taking V2O5 as a vanadium source and adopting a hydrothermal method, and then, the V6O13 nano material with more complete lattice arrangement is obtained through high-temperature annealing, so that higher battery capacity and more stable long cycle life are realized, and a new scheme is provided for research on an aqueous zinc ion battery positive electrode material.

The invention relates to a preparation method of high-purity vanadium pentoxide, in particular to the field of high-purity vanadium pentoxide, which comprises the following steps: adding an impurity removal agent into a phosphorus-containing vanadium solution to remove impurities, and then carrying out solid-liquid separation to obtain filtrate; the obtained filtrate is sequentially subjected to first pH value adjustment, second pH value adjustment, ammonium salt vanadium precipitation, dehydration, calcination deamination and melting, and high-purity vanadium pentoxide is obtained; wherein the impurity removing agent is prepared from calcium salt and a flocculating agent; the final pH value of the first pH value adjustment is 4.5-5.5; the final pH value of the second pH value adjustment is 1.8-2.2. According to the preparation method provided by the invention, the vanadium in the vanadium liquid is efficiently recovered by matching the metallographic phase specific impurity removal process of the vanadium liquid with pH value adjustment, the purity of the obtained vanadium product is greater than or equal to 99.9%, and the recovery rate of the vanadium is greater than or equal to 98%.

A method may include operating a dehydrogenation process whereby a hydrocarbon-containing feed is converted to light olefins, wherein the dehydrogenation process utilizes a fluidized process catalyst that circulates between a reactor and a combustor. The method may comprise withdrawing the process catalyst from the dehydrogenation process, modifying the process catalyst to form a modified catalyst, and adding the modified catalyst back to the dehydrogenation process. The process catalyst may include from 0.1 wt. % to 10 wt. % of one or more metals chosen from gallium, indium, thallium, or combinations thereof, from 1 ppmw to 1000 ppmw of one or more metals chosen from platinum, palladium, rhodium, iridium, ruthenium, osmium, or combinations thereof, and at least 85 wt. % support. Modifying the process catalyst may include adding one or more of manganese, iron, chromium, or vanadium.

The invention discloses a vanadium catalyst for preparing sulfuric acid through wet conversion as well as a preparation method and application of the vanadium catalyst, and belongs to the technical field of catalysts. By improving a catalyst formula and a preparation process, a silicate aid is added to generate crystal silicon dioxide to regulate the structure of a diatomite carrier, and the heat resistance and hydrothermal stability of the catalyst are improved; the rare earth additive is added to modulate the active phase of the catalyst, so that the activity of the catalyst in a wide temperature range (380-600 DEG C) is improved, and the requirement of modern development of preparing sulfuric acid by wet conversion can be met. The preparation method is improved on the basis of a traditional vanadium catalyst wet mixing method preparation process, the active component of the catalyst is changed into slurry from colloid, uniform mixing of the active component and a carrier is facilitated, the active component is uniformly dispersed, the utilization rate of the active component is increased, and the performance of the catalyst is improved.

The invention discloses a method for intensively leaching chromium from vanadium extraction waste slag, and belongs to the field of metallurgical chemical industry. According to the method, diboron trioxide serves as a catalyst, vanadium extraction waste slag, sodium carbonate and sodium hydroxide serve as raw materials, the raw materials and the catalyst are mixed according to a set proportion, and leaching is conducted after roasting is conducted in a microwave muffle furnace. According to the method provided by the invention, the reaction can be promoted to be efficiently carried out at medium and low temperatures, the extraction rate of chromium can reach 95% or above, and the synergistic effect of'low addition amount-high catalytic efficiency 'can be realized under the condition that a small amount of catalyst is added.

The present disclosure provides a high-vanadium high-speed steel and preparation method therefor, and use thereof, which relate to the technical field of high-vanadium high-speed steel. The preparation method includes: smelting raw materials to form a melt; impacting the melt to a cooling platform to form a high-vanadium high-speed steel casting billet; and performing a spheroidizing annealing treatment and a quenching and tempering treatment, so as to obtain a resultant. The spheroidizing annealing treatment includes: heating the high-vanadium high-speed steel casting billet to 820-910° C.; holding for 2-4 h; then cooling down to 450-550° C. at a cooling rate larger than 40° C. / h; and then air cooling to a room temperature.

The invention discloses a preparation method and application of a carbon dioxide hydrogenation catalyst, and belongs to the field of hydrogenation catalysis. The vanadium slag is used as a raw material, a leaching solution containing silicon, chromium and vanadium is obtained through sodium salt roasting, an aluminum source is added to remove the silicon element, meanwhile, an ordered mesoporous carbon material is added, and silicon and aluminum elements are converted into an ordered mesoporous composite oxide which is used as a hydrogenation catalyst carrier; an indium salt, a cerium salt and a nickel salt are dissolved in ethanol and mixed with the carrier for isopyknic impregnation to obtain the hydrogenation catalyst; and carrying out chromium and vanadium separation on the silicon-removed leaching solution to obtain chromium sesquioxide and the all-vanadium redox flow battery electrolyte. The catalyst has a regular pore structure, ordered mesopores provide a confinement effect, dispersion and anchoring of active components are facilitated, and the activity of the catalyst is remarkably improved.

The invention discloses a preparation method and application of an organic molecule metal ion double-intercalation vanadium-based oxide positive electrode material, and the method comprises the following steps: S1, adding 2, 5-hexanedione, aluminum chloride and a vanadium-based oxide into deionized water according to a preset molar ratio, and stirring to a uniform state; s2, continuously stirring the solution prepared in the step S1, controlling the stirring rate, and dropwise adding diluted hydrochloric acid to adjust the pH value to a target pH value; and S3, washing and drying the material prepared in the step S2 to obtain the organic molecule metal ion double-intercalation vanadium-based oxide positive electrode material. The vanadium-based oxide positive electrode material is optimized by applying an organic molecule metal ion double-intercalation strategy, the skeleton is greatly stabilized, the bonding mode of the vanadium-based oxide is optimized, more Zn < 2 + > ion intercalation active sites are provided, and the electrochemical performance of the material is improved. The prepared organic molecule metal ion double-intercalation vanadium-based oxide positive electrode material shows excellent cycling stability, relatively high specific capacity and excellent rate capability.

The invention relates to a method for recovering phosphorus and vanadium from a vanadium-containing salt-removed filter cake, and belongs to the technical field of aluminum oxide preparation. The method comprises the following steps: firstly, preparing vanadium-containing salt elimination filter cake slurry, then adding a dephosphorizing agent into the vanadium-containing salt elimination filter cake slurry, and promoting the dephosphorizing agent to generate precipitation reaction with phosphorus in the slurry to form a precipitate containing phosphorus element, so as to obtain a mixed solution containing the precipitate; next, solid-liquid separation is carried out on the mixed solution, precipitates containing phosphorus elements are filtered out, and the remaining vanadium-containing filtrate is further subjected to impurity removal treatment, so that residual carbonate radicals after the dephosphorization reaction and impurity elements such as arsenic and fluorine in the solution are removed, and adverse effects on the subsequent vanadium precipitation reaction are avoided. And after impurity removal is completed, vanadium precipitation reaction is carried out, and a pure vanadium-containing product is obtained. According to the method, by using the specific dephosphorizing agent, phosphorus in the vanadium-containing salt elimination filter cake is effectively recovered, and the tailing discharge amount is reduced. Meanwhile, the method also improves the concentration of vanadium, is beneficial to the recovery of vanadium, and realizes the simultaneous recovery of phosphorus and vanadium in the vanadium-containing salt elimination filter cake.

The invention relates to the field of methods or devices for directly converting chemical energy into electric energy, and provides a vanadium ion valence state automatic adjusting system and method and an all-vanadium redox flow battery system. The automatic adjusting system comprises an optical detection module, a central processing module and a reducing agent adding executing mechanism. The optical detection module collects electrolyte from the running all-vanadium redox flow battery and detects light absorption data, and the central processing module determines the concentration of multivalent vanadium ions according to the light absorption data and calculates the additive amount of a reducing agent; and the reducing agent adding executing mechanism adds a reducing agent into the all-vanadium redox flow battery according to the reducing agent adding amount. According to the invention, online real-time monitoring and accurate adjustment of the vanadium ion valence state of the all-vanadium redox flow battery in operation are realized, and the problems of lagging off-line detection response, frequent manual intervention, high cost of an electrolytic regeneration method and the like in the prior art are solved, so that the efficient operation of the all-vanadium redox flow battery is maintained, the coulombic efficiency is improved, the attenuation rate is reduced, and the manual maintenance is reduced.

Methods for preparing catalysts for oxidative dehydrogenation (ODH) of alkanes such as ethane are provided. An exemplary method includes forming a slurry including metal oxides; one or more of a bismuth compound, an antimony compound, and a tellurium compound; a reducing agent; and water; and heating the slurry to form the catalyst. The metal oxides include an oxide of molybdenum and an oxide of vanadium. The bismuth compound includes bismuth oxide, bismuth hydroxide, or a bismuth carbonate. The antimony compound includes an oxide of antimony, an antimony acetate, or an antimony ethoxide. The tellurium compound includes tellurium dioxide. The reducing agent includes molybdenum dioxide and may further include vanadium dioxide. The methods use all inorganic reagents, with no build up COx pressure observed during the hydrothermal synthesis.

The invention relates to the technical field of all-vanadium redox flow batteries, and discloses a supported electrolyte of all-vanadium redox flow battery positive and negative electrolyte and a preparation method thereof, and the supported electrolyte comprises an aqueous solution containing vanadium ions, sulfonate ions, sulfate ions and phosphonic acid groups. The sulfonic acid group (-SO3H) has strong polarity and high ionization degree, after the sulfonic acid group (-SO3H) is mixed with the phosphonic acid group (-PO3H2) and sulfuric acid, the ionic environment of the electrolyte can be optimized, the activation energy of V (II) / V (III) and V (IV) / V (V) electricity on electron transfer is reduced, and compared with an existing sulfuric acid supported electrolyte, the reversibility of electrochemical reaction is remarkably improved, and the electrochemical activity of the electrolyte is enhanced; meanwhile, phosphonic acid groups have high complexing ability, can form stable chelates with vanadium ions and can form complexing-dispersing synergy with sulfonic acid groups, the solubility of the vanadium ions is improved, and agglomeration and crystallization of the vanadium ions are inhibited.

The invention belongs to the technical field of glass for buildings, and discloses a thermochromic intelligent window based on a vanadium dioxide nanoparticle film concentration gradient structure and a preparation method thereof.The preparation method comprises the steps that firstly, two parts of W-VO2 nanoparticles with different masses and PVP are added into absolute ethyl alcohol to be subjected to ultrasonic oscillation, and the W-VO2 nanoparticles and PVP are stirred to be evenly distributed and then stand for use; the method comprises the following steps: sequentially coating the surface of a pretreated glass substrate with W-VO2amp with relatively high concentration from bottom to top; a PVP dispersion liquid, a PMMA dispersion liquid, and low-concentration W-VO2amp are added; a PVP dispersion liquid; therefore, a W-VO2 gradient structure with low concentration at the top layer and high concentration at the bottom layer is formed on the surface of the glass substrate. The visible light transmittance of the thermochromic intelligent window is greatly improved, meanwhile, the solar modulation capacity is improved, the antagonism between the two optical properties of the visible light transmittance and the solar modulation efficiency is weakened or even broken through, and thermochromic development of the intelligent window and the radiation refrigeration field is further promoted.

The invention discloses a method for separating vanadium and iron in a high-iron-vanadium electrolyte. The method comprises the steps of pH regulation and control, iron removal, vanadium extraction and vanadium reverse extraction. In the step of iron removal, an iron ion targeted complexing agent and a solid phase adsorbent are added into the high-iron vanadium electrolyte with the pH adjusted, reaction is conducted for 10-15 min under stirring, then direct filtering is conducted, and low-iron vanadium electrolyte and a solid phase are obtained; in the vanadium extraction step, vanadium in the low-iron vanadium electrolyte is extracted by adopting a mixed solvent of pretreated P204, TBP and sulfonated kerosene, and a vanadium-containing organic solution is obtained; and the vanadium reverse extraction comprises the step of carrying out reverse extraction on the vanadium-containing organic solution through a sulfuric acid solution with the concentration of 2.0-5.0 mol / L to obtain a vanadium electrolyte. The method can be used for treating iron ions in all valence states, particularly ferric ions which are easier to extract than vanadium ions, qualified vanadium electrolyte with the iron ion concentration meeting the industrial standard can be directly obtained after reverse extraction, and a complexing agent and an adsorbent can be recycled.

A process produces high-purity vanadium chemicals from vanadium raw materials having high molybdenum contents. Molybdenum is selectively precipitated via vanadium from alkaline vanadate solutions using the following process steps: providing a molybdenum-containing alkaline vanadate solution, adding calcium hydroxide as a precipitant in portions while keeping the pH constant between 6 and 7 using acid, mixing the solution, solid-liquid separation of the resulting suspension, and further processing the low-molybdenum alkaline vanadate solution to produce a high-purity vanadium chemical having a molybdenum content of at most 500 ppm.

The invention relates to the field of vanadium and chromium separation, and particularly discloses a sodium vanadium solution treatment method which comprises the following steps: S100, adding an alkaline reducing agent into a sodium vanadium solution, and carrying out reduction of hexavalent chromium and selective precipitation reaction of trivalent chromium; s200, at the later stage of the reaction in the step S100, urea is added into a solution system, and a deep removal reaction of silicon and chromium is carried out; and S300, after the reaction in the step S200 is finished, solid-liquid separation is conducted, silicon-chromium slag and purified vanadium liquid are obtained, silicon-chromium oxide is obtained after the silicon-chromium slag is treated and can be used for smelting silicon-chromium alloy, and the purified vanadium liquid is subsequently used for preparing a high-purity vanadium oxide product. According to the method, the vanadium sodium salt solution obtained through a vanadium slag sodium salt roasting-water leaching process is used as a raw material, hexavalent chromium in the solution is reduced through an alkaline reducing agent, selective precipitation separation of hexavalent chromium and vanadium is achieved, and meanwhile urea is supplemented to conduct synergistic precipitation removal on silicon in the solution.

The invention discloses an uncooled infrared detector and a manufacturing method thereof, and relates to the technical field of detectors, the uncooled infrared detector comprises a readout circuit, the readout circuit is provided with a micro-bridge structure and an umbrella-shaped absorption structure, the micro-bridge structure comprises a metal electrode, a reflecting layer, a first sacrificial layer, a first supporting layer, an electrode layer and a thermosensitive layer, and the electrode layer is arranged on the supporting layer. The thermosensitive layer is arranged on the electrode layer, and the first passivation layer is arranged at the top of the microbridge structure. By adopting the thermosensitive layer with a three-layer structure of vanadium oxide, vanadium and vanadium oxide and optimizing sputtering process parameters, the sensitivity and the stability of the thermosensitive film are improved, secondly, due to the design of an umbrella-shaped absorption structure and the synergistic effect of the second sacrificial layer, the second supporting layer and the absorption layer, the absorption rate and the filling rate of an infrared pixel are improved, and the stability of the film is improved. Not only is the absorption efficiency of infrared radiation enhanced, but also a heat conduction path is optimized, so that the response speed and the signal-to-noise ratio of the detector are improved.