167 results about "Vanadate" patented technology

The invention discloses a novel photocatalyst for producing hydrogen from organic matter wastewater and a preparation method of the novel photocatalyst, and relates to the technical field of photocatalysis. The photocatalyst disclosed by the invention is combined with oxidation-reduction capability, and can effectively degrade and produce hydrogen under the irradiation of sunlight. Through combination of quaternized porous tungsten oxide and vanadate radicals, silver vanadate load growth is promoted, the sunlight utilization rate is increased, and the electron-hole recombination rate is reduced. Reduced graphene oxide is used for pretreatment, active groups are introduced, the reduced graphene oxide is compounded with tungsten oxide / silver vanadate, the binding force is enhanced through heat treatment, photo-induced electron-hole pair compounding is inhibited through the conductivity, and the visible light catalytic performance is improved. The adsorption effect of porous tungsten trioxide and reduced graphene oxide can accelerate the degradation of organic matters. By optimizing the proportion of silver vanadate, tungsten oxide and reduced graphene oxide, the visible light response and charge separation efficiency are enhanced, the degradation and hydrogen production performance is improved, and light corrosion is reduced.

The invention provides a lithium iron phosphate composite material and a preparation method thereof, a positive pole piece and a secondary battery, the lithium iron phosphate composite material comprises a core layer, the core layer comprises an inner core, a coating layer coating the inner core, and a mutual doping layer located between the coating layer and the inner core; wherein the material of the inner core comprises lithium iron phosphate, the material of the coating layer comprises sodium vanadium fluorophosphate, and the material of the mutual doping layer comprises vanadium-doped lithium iron phosphate. A core layer of the lithium iron phosphate composite material adopts lithium iron phosphate as an inner core, the inner core is coated with sodium vanadium fluorophosphate, and a mutual doping layer structure is arranged between the inner core and a coating layer, so that mixed migration of Li / Na ions is realized, and meanwhile, the lithium iron phosphate composite material has excellent ion diffusion efficiency, relatively high theoretical specific capacity and a relatively high voltage platform; the material has low powder resistivity, a stable charge-discharge platform and excellent cycle performance, and the electrochemical performance such as energy density and cycle performance is effectively improved.

The invention provides a vanadium aluminum phosphate electrode material and a preparation method thereof. In target product components, an aluminum source, a vanadium source and a phosphorus source are respectively aluminum nitrate or other aluminum sources, vanadium pentoxide or ammonium vanadate, ammonium dihydrogen phosphate, phosphoric acid or other phosphorus sources, and a nitrogen source of nitrogen-doped carbon is from polyvinylpyrrolidone or other nitrogen sources of a gel component; the carbon source is selected from polyvinyl alcohol and glycerol. By adopting an exogenous plasticizing physical crosslinking sol-gel method, in the whole reaction system, uniform distribution of reaction ions and intermediates is maintained, and finally, gel is networked, so that the problem of capacity fading caused by an unstable structure of an existing aluminum ion battery positive electrode material in a circulating process is solved, and the service life of the aluminum ion battery positive electrode material is prolonged. And the problems of high reaction system selection requirement, long preparation period and complex process of the existing endogenous covalent polycondensation sol-gel method for preparing the electrode material are solved.

The invention discloses a silver vanadate photocatalytic material, a preparation method thereof and an illuminating lamp. The preparation method comprises the following steps: firstly, respectively dissolving NH4VO3 and AgNO3 in deionized water, uniformly mixing by magnetic stirring, adjusting the pH value of the solution, and then carrying out hydrothermal synthesis reaction to obtain the Ag3VO4 photocatalytic material. The Ag3VO4 photocatalytic material with controllable morphology, uniform particle size and good dispersity is prepared by adopting a synthesis strategy of a one-step hydrothermal method, the performance of the photocatalyst is optimized by regulating and controlling the pH value, the raw materials and the process are simple, the conditions are easy to control, the cost is low, the photocatalytic degradation rate of the catalyst to organic pollutants is high, and the method is suitable for industrial production. The stability of a crystal structure and catalytic activity can be kept under long-term illumination, and the functional application of a photocatalytic air purification technology can be realized by integrating with an illumination lamp.

The invention relates to a method for extracting vanadium by using high-calcium steel slag and titanium dioxide waste acid, and relates to the technical field of resource utilization of metallurgical chemical waste, the method comprises the following steps: crushing high-calcium steel slag to obtain high-calcium steel slag powder; mixing the high-calcium steel slag powder and the titanium white waste acid to obtain a mixture; the mixture is heated and stirred for a reaction, then solid-liquid separation is conducted, and filtrate containing vanadate is obtained; the filtrate containing vanadate is subjected to purification treatment, and purified filtrate is obtained; and the purified filtrate is purified and refined, and a vanadium product is obtained. According to the method, the high-calcium steel slag and the titanium white waste acid are comprehensively treated, so that the resource utilization of wastes is realized, the environmental pollution is reduced, the process is simple and feasible, the operability is high, additional specific equipment is not needed, and the method has a good industrial application prospect. Meanwhile, the obtained vanadium product is high in purity and can be widely applied to the fields of steel, aerospace, chemical engineering and the like.

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 discloses a vanadium iron-site doped iron phosphate material and a preparation method, and relates to the technical field of lithium ion battery positive electrode material preparation, pure water is used as a base solution, and a vanadium salt solution with the pH value of 2.0-3.0, a ferrite solution with the pH value of 1.0-2.5 and a phosphorus-oxygen mixed solution with the pH value of 5.0-7.0 are simultaneously added into a reaction kettle in a three-strand parallel flow mode for a co-precipitation reaction. By controlling the acid environment of a key solution system, reduction of metavanadate radicals or generation of ferric vanadate precipitates is effectively inhibited, and vanadium elements are successfully and uniformly doped to iron sites of iron phosphate crystal lattices; the mass ratio of iron to phosphorus in the obtained iron phosphate material is stabilized at 95-98%, the doping amount of vanadium is 100-10000 ppm, and the vanadium is uniformly distributed. Lithium iron phosphate prepared by taking the material as a precursor has higher discharge capacity and compaction density, and the electrochemical performance of a lithium ion battery is remarkably improved.

The invention relates to a vanadium oxide coated and zirconium-doped modified precursor and a preparation method and application thereof.According to the preparation method, zirconium doping and an ammonium vanadate solution are specifically used, cation mixing is inhibited through the stabilization effect of zirconium, lattice distortion is reduced, the stable unit cell volume can be maintained through zirconium doping, and the stability of the unit cell volume is improved; and the problem of unit cell expansion caused by conventional doping elements is avoided, so that the high-rate performance of the material is reserved. The semiconductor-metal phase change characteristic of vanadium oxide is utilized, the critical temperature can be adjusted to be close to the room temperature, and the high-temperature stability and electronic conductivity of the material are improved; through the combination of the two, the high-rate discharge performance of the ternary positive electrode material and the structural stability of the material can be greatly improved.

The invention belongs to the field of vanadium batteries, and particularly discloses a vanadium battery key material as well as a preparation method and a preparation system thereof. The method comprises the following steps: adding ammonium salt and acid into an alkaline vanadium-containing leaching solution, and carrying out weak acid ammonium salt vanadium precipitation reaction under the conditions that the pH is 4-6 and the temperature is 20-85 DEG C to obtain a sodium ammonium decavanadate solid; the method comprises the following steps: mixing a sodium ammonium decavanadate solid with a solution containing ammonium ions, and carrying out solid-phase crystal transformation ammonium sodium replacement reaction at the temperature of 90-100 DEG C to obtain high-purity ammonium vanadate; directly calcining the high-purity ammonium vanadate or calcining the high-purity ammonium vanadate after re-dissolution recrystallization to obtain high-purity vanadium pentoxide; the high-purity vanadium pentoxide is used for preparing a vanadium battery key material. According to the scheme, the alkaline vanadium-containing leachate serves as the raw material, deep removal of impurities is achieved through weak acid ammonium salt vanadium precipitation and solid-phase crystal transformation ammonium sodium replacement, high-purity ammonium vanadate is prepared, high-purity vanadium pentoxide is further prepared, and the high-performance vanadium battery key material is prepared with the high-purity vanadium pentoxide serving as the raw material.

The invention discloses a method for preparing alkali metal vanadate by a mechanochemical reaction method. The method comprises the following steps: mixing a vanadium-containing compound and an alkali metal compound according to the stoichiometric ratio of a target product, adding or not adding a protic solvent, and grinding to induce a mechanochemical reaction among the raw materials, so as to obtain the alkali metal vanadate, wherein the alkali metal vanadate is selected from one of NaVO3, KVO3, RbVO3, CsVO3, Rb3V5O14, Cs2V4O11 and Li3VO4, and the alkali metal vanadate is selected from one of NaVO3, KVO3, RbVO3, CsVO3, Rb3V5O14, Cs2V4O11 and Li3VO4. The preparation method has the advantages of being environmentally friendly, low in energy consumption, high in reaction efficiency and the like, efficient preparation of all series of alkali metal vanadate can be achieved, and the obtained alkali metal vanadate is high in purity, small in particle size and good in dispersity and has potential application value in the fields of lithium ion batteries, photocatalysis, laser crystals and the like.

The invention relates to the technical field of hydrometallurgy, and provides a method for cleanly extracting vanadium from vanadium slag based on dolomite. According to the method, dolomite is adopted to replace a traditional calcification or sodium salt roasting auxiliary agent to co-roast the vanadium slag, and vanadium in the vanadium slag is roasted through two-step temperature control to be converted into acid-soluble calcium magnesium vanadate roasting clinker. The roasting clinker is subjected to acid leaching to obtain vanadium liquid, the vanadium liquid is subjected to deep impurity removal through a magnesium ammonium phosphate precipitation method, ammonium sulfate is added into the vanadium liquid, the pH value is adjusted, acid ammonium salt vanadium precipitation is conducted, and ammonium polyvanadate is obtained. And washing, filtering, drying and calcining the ammonium polyvanadate to obtain high-purity powder vanadium pentoxide or melting and casting to obtain high-purity tablet vanadium pentoxide. Vanadium precipitation wastewater is subjected to reduction treatment, lime neutralization and solid-liquid separation and then is reused in a leaching system, and cyclic utilization of ammonium salt and water resources is achieved. By means of the technical scheme, the problem that in the related technology, the vanadium leaching rate is low is solved.

The invention provides a seven-core tungsten-vanadium heteropolyacid alkoxy derivative and a preparation method and application thereof, and belongs to the organic and inorganic hybrid material technology, the chemical formula of the seven-core tungsten-vanadium heteropolyacid alkoxy derivative is (C16H36N) 2 [WV6O16 {(OCH2) 3CCH2OH} 2], the seven-core tungsten-vanadium heteropolyacid alkoxy derivative is composed of a metal-oxygen cluster anion [WV6O16 {(OCH2) 3CCH2OH} 2] 2-and two tetrabutylammonium cations, the preparation method comprises the following steps: dissolving polytungstate, polyvanadate and a trihydroxymethyl compound in an anhydrous organic solvent according to a ratio, and carrying out microwave-assisted synthesis. According to the preparation method, the Tris functionalized heptanuclear tungsten-vanadium heteropolyacid with the metal tungsten-vanadium ratio of 1: 6 is prepared through a simple microwave-assisted synthesis method, the structural diversity of a tungsten-vanadium heteropolyacid system is enriched, and the synthesized heptanuclear tungsten-vanadium heteropolyacid alkoxy derivative has excellent oxidation-reduction capacity and has extremely high application value in the field of electro-catalytic hydrogen evolution.

This invention provides a method for in-situ removal of vanadium from wastewater. The method involves first adjusting the pH to acidity and then alkalinity, thereby controlling the degree of vanadium hydrolysis and disrupting the stable form of (meta)vanadate in the wastewater, causing it to primarily exist as VO2(OH)2. ‑ Vanadium exists in the form of vanadium, and when Fe(II) is added, it undergoes a redox reaction with V(V) in the wastewater, effectively reducing vanadium(V) in the wastewater to V, which has lower toxicity and is relatively unstable. 2+ (VI) Reduce wastewater toxicity; then adjust to an alkaline environment, utilizing the interaction of hydroxide ions, iron, and vanadium to precipitate vanadium into VO2·H2O and Fe2O3·V2O5·H2O, thus achieving vanadium removal. The entire process of this invention is easy to control, has a high vanadium removal rate, and requires a small amount of reducing agent.

The invention discloses an L-cysteine doped ammonium vanadate positive electrode material, a preparation method thereof and application of the L-cysteine doped ammonium vanadate positive electrode material in an aqueous zinc ion battery, and belongs to the technical field of materials. The preparation method comprises the following steps: adding ammonium metavanadate and oxalic acid into deionized water, stirring and mixing, then adding L-cysteine, carrying out hydrothermal reaction on the obtained mixed solution, cooling to room temperature, carrying out centrifugal cleaning, and carrying out vacuum drying to obtain the L-NVO. L-NVO is prepared through a simple one-step hydrothermal method, L-cysteine is doped into the electrode material through further reaction, the introduction of L-cysteine not only enlarges the interlayer spacing of NVO, but also participates in the storage of zinc ions, increases the active sites of the zinc ions, effectively promotes the diffusion of ions and charge transfer, and improves the electrochemical performance of the electrode material. The conductivity of the material is improved, the internal resistance of the material is reduced, and the structural flexibility and stability of the material are maintained, so that the overall performance of the aqueous zinc ion battery is improved.

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

The invention discloses a method for comprehensively utilizing vanadium and chromium resources, which comprises the following steps: mixing chromium hydroxide with sodium hydroxide, and introducing oxygen for liquid-phase oxidation to obtain an oxidation solution; adding calcium oxide into the oxidation liquid, stirring and mixing, and performing solid-liquid separation after reaction to obtain calcium vanadate solid and vanadium-free alkali liquid; adding a decalcifying agent into the vanadium-free alkali liquor, and carrying out solid-liquid separation to obtain calcium carbonate and refined sodium chromate alkali liquor; reacting calcium vanadate with roasting slurry containing aluminum, silicon and carbonate to form calcium aluminosilicate precipitate and desiliconized high-vanadium alkali liquor; continuously neutralizing the desiliconized high-vanadium alkali liquor and the carbonization solution to obtain an aluminum-vanadium high-valued product and a neutral solution; the neutral liquid is carbonized, and obtained sodium bicarbonate and carbonized liquid can be returned to a system for recycling. The method for comprehensively utilizing the vanadium and chromium resources has the advantages of being simple in process, environmentally friendly, efficient, easy to control in operation, easy to obtain raw materials, low in production cost and the like.

The invention discloses a method for directly preparing ferrovanadium by taking ammonium vanadate as a raw material. The method comprises the steps of raw material pretreatment, vacuum heating decomposition, furnace charge mixing and aluminothermic reduction smelting. In the step of vacuum heating decomposition, the pretreated ammonium vanadate is loaded into a double-cone rotary vacuum dryer to be subjected to vacuum heating, so that the pretreated ammonium vanadate is decomposed, ammonia gas and water vapor are released, and a decomposition product with V2O4 and V2O5 as main components is obtained; the step of mixing the furnace charge comprises the following steps: uniformly mixing a decomposition product with aluminum powder, lime, iron powder and a cold charge according to the mass ratio of (60-120): (30-65): (6-10): (6-10): (6-15) based on the mass of V2O5; in the aluminothermic reduction smelting, a magnesium rod is used for igniting furnace charge to carry out aluminothermic reaction; and after the reaction is finished, cooling to room temperature to obtain the ferrovanadium alloy. The method can effectively simplify the process flow, reduce the production cost, improve the product quality, and solve the technical problems of tedious steps and high cost of the traditional process.

The invention discloses a titanium white waste acid treatment process, and relates to the technical field of industrial waste regeneration. The titanium white waste acid is subjected to microfiltration and membrane electrolysis treatment, sulfuric acid is separated and recycled under the control of constant pressure and constant current, and residual liquid is subjected to electrodialysis treatment to oxidize ferrous ions into ferric hydroxide precipitates and calcined into ferric oxide; carrying out reduction leaching on the titanium-containing material, hydrolyzing to generate metatitanic acid, and calcining to obtain titanium dioxide; oxidizing the hydrolysate to precipitate vanadate, and calcining to obtain vanadium pentoxide; adjusting the pH value of the filtrate, selectively adsorbing scandium through a biological adsorption column, precipitating and calcining the eluent to obtain scandium oxide, and regenerating and recycling the adsorbent through acid pickling. According to the process, through multi-stage treatment and biological adsorption, resource recycling of sulfuric acid, iron, titanium, vanadium and scandium components in the waste acid is achieved, the process is clean and efficient, secondary pollution of a traditional process is avoided, and a green low-carbon solution is provided for waste acid treatment in the titanium dioxide industry.

The invention discloses a preparation method and application of a vanadium-doped titanium dioxide composite material, and relates to the technical field of titanium dioxide composites.The preparation method comprises the following steps that 1, ammonium vanadate and titanium dioxide are mixed in proportion, the doping amount of the vanadium element is controlled to range from 0.1 wt% to 12.5 wt% according to the total mass of the mixture, then high-temperature heating is conducted, and a mixture is obtained; vanadium-doped titanium dioxide powder is obtained; and (2) mixing the vanadium-doped titanium dioxide powder with a carrier in proportion, controlling the content of the vanadium-doped titanium dioxide powder to be 10-30 wt% based on the total mass of the composite material, and carrying out physical grinding to obtain the powdery vanadium-doped titanium dioxide composite material. The catalytic material disclosed by the invention is applied to degradation of sulfur hexafluoride and has excellent degradation capability.

The invention belongs to the technical field of all-vanadium redox flow batteries, and relates to a preparation method of a vanadium electrolyte and solid vanadyl sulfate, and the preparation method of the vanadium electrolyte comprises the following steps: based on pH value adjustment in a vanadium molybdate solution and a reverse extraction reagent, realizing co-extraction of vanadium and molybdenum elements in the vanadium molybdate solution by extracting an organic phase and sequential reverse extraction and recovery of the molybdenum and vanadium elements, the extraction organic phases for extracting vanadium and molybdenum elements have the same composition; and purifying the recovered vanadium product to prepare the vanadium electrolyte. The problems that in the prior art, synchronous recovery of various vanadium and molybdenum elements is difficult to achieve, the vanadium element is difficult to recycle, the vanadium recovery rate is low, the purity of recovered products is low, environmental pollution is large, the requirement for the purity of vanadium raw materials is high, the steps of a vanadium raw material purification preparation process are complex, and vanadium is difficult to separate from vanadium and molybdenum homologous materials are solved. The method overcomes the defects of low yield and low product purity caused by poor separation effect of elements in the vanadium molybdate solution in the prior art.

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

The application provides a method for preparing vanadium electrolyte by crystallizing vanadium slag with bayer seed mother liquor, which comprises the following steps: reducing and acid leaching the bayer seed mother liquor crystallized vanadium slag, converting V(V) and As(V) into V(IV) and As(III), adding arsenic removal precipitator to remove arsenic, and further hydrolyzing VO(OH)2; converting the VO(OH)2 into pentavalent vanadate solution through oxidation and alkali leaching, and further removing impurity ions such as arsenic, phosphorus, aluminum and silicon through multiple crystallization to obtain high-purity vanadate; finally, converting the high-purity vanadate into V(IV) solution through reduction and acid leaching, adding arsenic removal precipitator again to realize deep arsenic removal, hydrolyzing to obtain VO(OH)2, and preparing VOSO4 electrolyte through sulfuric acid acid solution.

The present invention relates to a method for preparing a metal single-atom catalyst supported on vanadium nitride. In this method, an ammonium metavanadate solution is dropped into a mixed solution containing zinc nitrate and a second metal source, and a metal-doped zinc vanadate precursor is synthesized by chemical precipitation. Subsequently, in an ammonia atmosphere, the metal-doped zinc vanadate precursor is subjected to high-temperature nitridation to prepare the metal single-atom catalyst supported on vanadium nitride. The metal single-atom loading in the metal single-atom catalyst supported on vanadium nitride is 0.01 to 4.5 wt%. The synthesis method of the present invention only requires two steps and is applicable to various metals. The synthesized metal single-atom catalyst supported on vanadium nitride can be used in the catalytic field.

The present application belongs to the field of waste resource utilization and hydrometallurgy, and particularly relates to a method for preparing vanadium pentoxide by using organic amine flue gas desulfurization residue, which adopts melamine method flue gas desulfurization residue as a vanadium precipitation agent. Under acidic conditions, the organic amine flue gas desulfurization residue can react with vanadate to generate more stable organic amine vanadate precipitate. After filtration, the precipitate is high-temperature calcined to obtain high-purity powder vanadium pentoxide. Compared with the current ammonium sulfate salt vanadium precipitation method, the present application has higher precipitable vanadium concentration, low ammonia nitrogen concentration in wastewater, and no need for heating in the reaction process, and is an environmentally friendly and low-cost vanadium pentoxide preparation technology.

The application discloses a preparation method and application of a nickel vanadate / carbon nanotube composite nanosphere. NiCl2.6H2O and nickel-plated carbon nanotubes are added into an ammonium metavanadate solution, and then anhydrous ethanol is slowly added. The mixture is heated at a temperature of 160-200 DEG C for 6-10 hours. The mixture is centrifuged and the precipitate is dried to obtain the nickel vanadate / carbon nanotube composite nanosphere. The nickel vanadate / carbon nanotube composite nanosphere is synthesized by a one-step hydrothermal method for the first time, and has high dispersion and uniform particle size. The unique CNT winding main body structure can provide an electrically conductive path for electron transmission. The ultra-small nickel vanadate nanoparticles are uniformly embedded on the CNT, which accelerates electron transmission and greatly reduces the transmission distance of lithium ions, and improves the electrochemical performance of the nickel vanadate / CNT composite nanosphere. The nickel vanadate / CNT lithium ion battery negative electrode material prepared by the method has good cycle stability and rate performance.

The application discloses a kind of bismuth-doped carbon nitride photocatalyst and its preparation method and application in NADH regeneration, comprising the following steps: bismuth salt is dissolved with vanadate in concentrated nitric acid, then deionized water is added, and bismuth vanadate precursor solution is formed by stirring violently;Vanadium bismuth precursor solution is transferred to microwave synthesis instrument to carry out microwave synthesis to obtain bismuth vanadate;Synthesized bismuth vanadate and carbon-nitrogen precursor are transferred to porcelain boat, put into tube furnace, slowly heated and calcined under Ar atmosphere, after calcination is finished, the obtained solid product is ground into powder for standby;The obtained powder is added to anhydrous ethanol, washed several times, then centrifugal separation solid, after drying, it is the bismuth-doped carbon nitride photocatalyst prepared.The application is prepared by using the above technology, and the prepared bismuth-doped carbon nitride photocatalyst has good performance in regenerating coenzyme NADH, and has the characteristics of simple preparation method, wide raw material source, good catalytic effect, safety and environmental protection.

The invention belongs to the technical field of wet vanadium extraction, and particularly relates to a method for efficiently separating vanadium and iron in iron vanadate slag. The method comprises the following steps: quickly adding the iron vanadate slag into an alkaline solution with the temperature of 30-100 DEG C for stirring and leaching, controlling the temperature of reaction slurry, reacting for 2-20 minutes, immediately adding ferrite for magnetizing reaction to obtain black slurry, performing magnetic suction sedimentation on the slurry for the sedimentation time of less than 20 minutes until the sedimentation liquid level is clear, performing magnetic suction filtration and separation on a lower-layer precipitation phase, and filtering and separating the lower-layer precipitation phase to obtain the iron vanadate slag. The filtering time is less than 15 minutes, filtrate and supernate are mixed into vanadium-containing alkali liquor, the recovery rate of vanadium reaches 95% or above, the vanadium-containing alkali liquor can be directly used as a raw material for preparing high-purity vanadium pentoxide, and a filter cake is washed with water and then used as a raw material for ironmaking.

The invention provides a surface treatment method which is suitable for a metal base material, and the metal base material is provided with an appearance surface. The surface treatment method includes the following steps. The method comprises the following steps of: firstly, performing surface sand blasting treatment on the appearance surface to form a sand blasting surface; then, an electrolyte is matched, and micro-arc oxidation treatment is performed on the sand blasting surface, so that a micro-arc oxidation surface is formed. Then, forming a coating to cover the micro-arc oxidation surface; wherein the electrolyte comprises the following components: sodium phosphate, sodium silicate, sodium aluminate, potassium fluoride, potassium hydroxide, ammonium vanadate, potassium vanadate, disodium ethylene diamine tetraacetate (Na2EDTA) and sodium tetraborate.

The invention relates to the technical field of metallurgy, in particular to a preparation method of a high-nitrogen vanadium-nitrogen alloy and the high-nitrogen vanadium-nitrogen alloy.The preparation method comprises the following steps that 1, wet-based industrial-grade ammonium vanadate, a graphite carbon powder reducing agent, a metal iron powder catalyst and a water-based binder are mixed and stirred according to the mass ratio of 100: (18-22): (0.2-0.5): (8-20), and a mixture is obtained; 2, the mixed material is subjected to compression molding, and a preformed material is obtained; and 3, the preformed material is sequentially subjected to low-temperature pre-sintering dehydration treatment, high-temperature nitridation reduction treatment and cooling annealing treatment, and the high-nitrogen vanadium-nitrogen alloy is obtained. According to the preparation method, industrial-grade wet-based ammonium vanadate is directly adopted as a raw material, pretreatment is not needed, and the production cost is further reduced.

The invention discloses a vanadium inhibitor and a preparation method thereof, a petroleum additive and application, and the vanadium inhibitor comprises the following components in percentage by mass: 45%-70% of a magnesium-containing compound, 5%-22% of a dispersing agent, 15%-45% of a solvent and 0.5%-8% of an anti-settling agent. Wherein the mass percent of the magnesium element in the vanadium inhibitor is 20%-36%, the particle size D100 of the vanadium inhibitor is smaller than 350 nm, and the magnesium-containing compound comprises one or more of magnesium oxide, magnesium hydroxide and magnesium carbonate. The vanadium inhibitor with high magnesium element content and small particle size range is obtained by selecting the specific magnesium-containing compound and optimizing the formula of the vanadium inhibitor, can be efficiently combined with the vanadium element in an oil material to generate magnesium vanadate, has a good vanadium inhibition effect, still keeps excellent flowability in a water-containing environment or high and low-temperature environments, and can be used for preparing magnesium vanadate. Decomposition and curing do not occur, and good stability is achieved.