76 results about "Aluminothermic reaction" patented technology

The invention provides a gas phase change rock breaking device and method based on an aluminothermic reaction, and belongs to the technical field of rock blasting. The rock breaking device comprises a graphite excitation pipe, a liquefied air bag and a sealing cover, the excitation pipe is filled with thermite, and thermite reaction can be carried out to release heat; the liquefied air bag is hermetically sleeved outside the excitation tube, is filled with liquid oxygen or liquid nitrogen and is changed into gas under the action of heat released by the excitation tube, and rock mass fracture is realized by volume expansion. By arranging a multi-section excitation pipe serial connection structure, adopting the industrial graphite excitation pipe, designing a liquid oxygen or liquid nitrogen double-medium system and using the polyethylene degradable material bag body, the safety, the economical efficiency and the environmental adaptability of open-air rock mining are remarkably improved.

According to the composite current collector manufactured by coating the two sides of the aluminum foil with the single-walled carbon nanotube coatings, the two sides of the thin rolled aluminum foil are precisely coated with the single-walled carbon nanotube coatings; a single single-walled carbon nanotube with comprehensive technical characteristics of relatively long length, proper diameter, relatively few growth defects, relatively high conductivity, relatively high mechanical strength and bending flexibility is used as a raw material, and two surfaces of a rolled aluminum foil are respectively and precisely coated to prepare coatings mainly comprising the single-walled carbon nanotube; the single-walled carbon nanotubes in the coating have high three-dimensional physical entanglement density, tensile strength and conductivity, the mechanical property of the composite current collector is improved, belt breakage is prevented, the novel composite current collector meets the smooth requirement of the battery production process, and the energy density of the battery is improved; the use amount of aluminum foil in the positive electrode current collector is reduced, direct contact between the aluminum material and the positive electrode active material is avoided, heat released by aluminothermic reaction during thermal runaway of the battery is reduced, and the safety of the battery is improved.

The invention relates to a composite thermite for forcible entry and a preparation method thereof. The composite thermite comprises an aluminothermic reaction agent; a fluxing agent; a binder; and a strong oxidant. Wherein the thermit reaction agent is mixed powder composed of fuel metal particles and metal oxide particles, and the surfaces of the fuel metal particles are subjected to coating modification treatment through a fluorine-containing polymer; in the composite thermite, the mass ratio of the thermite reaction agent is 40%-75%, the mass ratio of the fluxing agent is 2%-10%, the mass ratio of the binder is 5%-20%, and the mass ratio of the strong oxidant is 5%-30%. The composite thermite disclosed by the invention is prepared into a blocky or columnar structure through a compression molding process or a curing molding process, is used for forcible entry of metal or non-metal obstacles, improves the forcible entry performance, is high in medicament environment adaptability and good in use effect, and can be produced on a large scale.

The invention provides a niobium-tungsten alloy and a preparation method thereof. The preparation method comprises the following steps: 1) performing vacuum reduction sintering on a powder blank comprising niobium powder, first tungsten powder, first molybdenum powder and yttrium powder to obtain a niobium-tungsten-molybdenum alloy strip; (2) carrying out aluminothermic reaction on powder comprising niobium oxide, aluminum powder, second tungsten powder and second molybdenum powder to obtain a niobium-tungsten-molybdenum-aluminum alloy block; (3) the niobium-tungsten-molybdenum-aluminum alloy block is subjected to vacuum electron beam melting, and a niobium-tungsten-molybdenum alloy plate is obtained; 4) forming a smelting electrode by using the zirconium sheet niobium-tungsten-molybdenum alloy strip, the niobium-tungsten-molybdenum alloy plate and the niobium wire; and (5) the smelting electrode is subjected to vacuum electron beam smelting, and the niobium-tungsten alloy is obtained and comprises, by mass, 4.5%-5.5% of tungsten, 1.5%-2.5% of molybdenum, 1.4%-2.2% of zirconium, smaller than or equal to 0.08% of yttrium, 0.002%-0.02% of carbon, smaller than or equal to 0.2% of tantalum, smaller than or equal to 0.023% of oxygen, smaller than or equal to 0.015% of nitrogen, smaller than or equal to 0.002% of hydrogen and the balance niobium and inevitable impurities, and the inevitable impurities must contain yttrium.

The invention discloses a battery thermal runaway self-inhibition coating based on a heat absorption type reverse thermit reaction as well as a preparation method and application thereof. The battery thermal runaway self-inhibition coating comprises the following raw materials in percentage by weight: 40-60% of Fe2O3, 15-25% of Al powder, 20-35% of a heat absorption additive, 5-10% of a binder and 0-5% of a trigger regulator, the heat absorption additive is Bi2O3 or SrCO3; the binder is a potassium silicate aqueous solution or high-temperature-resistant polysiloxane resin; the trigger regulator is copper oxide or manganese dioxide. The coating is not a single functional material, but is a'reaction system ', an thermit reaction is converted into an endothermic reaction by introducing an endothermic additive, and a product of the coating can be fused and sintered in situ to generate a compact porous ceramic-metal composite heat insulation layer during the endothermic reaction, so that a battery cell can be isolated in space, and the performance of the battery cell is improved. And heat radiation can be effectively blocked due to low heat conductivity, so that double insurance of heat absorption and isolation is realized.

The invention belongs to the field of vanadium-aluminum alloy smelting. The invention discloses a preparation method of a high-density low-defect vanadium-aluminum alloy. The method comprises the following steps: crushing raw materials; drying the raw materials; aluminum is prepared according to the amount of residual aluminum in the alloy accounting for 106%-108% of the theoretical amount of aluminum participating in the oxidation-reduction reaction, and the dried raw materials are evenly mixed; the mixed materials are put into a smelting furnace, and the composite flux is flatly laid on the materials; tiling titanium powder on the composite flux; igniting the titanium powder to carry out thermit reaction on the furnace charge in the furnace; gradient extreme cooling is conducted on the alloy, and sequential solidification from bottom to top is achieved at the temperature gradient of 50-100 DEG C / h; and after solidification, disassembling the furnace, carrying out water quenching, and cooling to obtain the vanadium-aluminum alloy. According to the method, the problems of surface oxidation, internal cracking, bottom loosening and the like of the vanadium-aluminum alloy can be synchronously solved, and the compactness and quality of the vanadium-aluminum alloy are remarkably improved.

The present invention discloses a method for controlling the yield of vanadium-aluminum alloy, which specifically comprises the following steps: (1) using a copper crucible and a graphite furnace body as a thermite reaction vessel; (2) mixing flaky vanadium pentoxide, aluminum particles and a slag-forming agent uniformly and adding the mixture to the thermite reaction vessel; (3) placing the reaction vessel filled with the mixed raw materials in a cooling pool with circulating water and installing a furnace cover; (4) igniting a magnesium strip to initiate the thermite reaction; (5) removing the furnace cover and the furnace body 5 to 8 minutes after the thermite reaction ends; (6) stopping the cooling water supply when the alloy ingot cools to 950°C and installing a heat-insulating furnace cover on the copper crucible; (7) cooling the alloy ingot naturally for 24 to 48 hours, and finishing the alloy after cooling to obtain a vanadium-aluminum alloy product. The present invention can increase the yield of vanadium-aluminum alloy to more than 86%.

The invention provides a low-oxygen low-nitrogen aluminum-niobium intermediate alloy and a preparation method thereof, and belongs to the technical field of intermediate alloys. The preparation method of the low-oxygen low-nitrogen aluminum-niobium intermediate alloy comprises the following steps that a niobium source, an aluminum source and an oxidizing agent are mixed, then charging is conducted under the argon and vibration conditions, and a mixture is obtained; and the mixture is sequentially subjected to a thermit reaction and cooling under the vibration condition, and the low-oxygen low-nitrogen aluminum-niobium intermediate alloy is obtained. According to the method, charging is carried out under the argon and vibration conditions, air remaining in gaps of mixture particles can be eliminated, introduction of oxygen and nitrogen in the thermit reaction process is reduced, and therefore the oxygen and nitrogen content of the aluminum-niobium intermediate alloy is reduced; and the thermit reaction and cooling are carried out under the vibration condition, so that thick dendritic crystals formed in the alloy solidification process can be crushed, the purpose of grain refinement is achieved, fine grain strengthening is achieved, and the obdurability of the aluminum-niobium intermediate alloy is improved.

A method and cascade reactor system for producing elemental rare earth metals and rare earth-aluminum alloys via aluminothermic reduction are disclosed. The method involves combining rare earth oxides or halide salts with aluminum powder, initiating a thermite-type reaction under inert or controlled atmospheric conditions, and recovering the molten metal product. Fluxing agents may be used to enhance slag fluidity and phase separation. The cascade reactor comprises multiple thermite zones with staged ignition, thermal transfer mechanisms, and slag separation interfaces, enabling sequential reduction of mixed feedstocks. The system supports both batch and continuous formats and achieves high recovery yields, reduced aluminum contamination, and compatibility with alloying and post-purification processes. The invention is adaptable to individual rare earth species and mixed oxide concentrates, offering a scalable, energy-efficient, and environmentally favorable route to rare earth metal and alloy production.

Disclosed herein are exothermic reaction mixtures that can be used for copper-based thermite reactions. The disclosed exothermic reaction mixtures can be advantageously formulated with synthetically made copper oxide(s), which can improve consistency and stability of thermite reactions. An example exothermic reaction mixture includes an alloy comprising copper and aluminum and a metal oxide comprising Cu2O and CuO. Also disclosed are methods of preparing the exothermic reaction mixture and methods of welding that include the exothermic reaction mixture.

The invention discloses a Ni3Al-PPy composite wave-absorbing material as well as a preparation method and application thereof, and belongs to the technical field of electromagnetic wave-absorbing materials. The Ni3Al-PPy composite wave-absorbing material with a core-shell structure is successfully synthesized by combining a thermit reaction with a chemical oxidation polymerization method and hydrochloric acid modification. By regulating and controlling the addition amount of the pyrrole monomer in the range of 0.25-0.75 mL, the continuous regulation and control of the thickness of the PPy shell layer from 0.22 [mu] m to 0.31 [mu] m is realized. When the thickness of a PPy shell layer is 0.27 mu m and the matching thickness of the composite wave-absorbing material is 3.0 mm, the minimum reflection loss and absorptivity gt of-40.0 dB are obtained at 9.27 GHz; and when the matching thickness is 2.0 mm, the effective absorption bandwidth reaches 3.02 GHz. According to the invention, the effect of the shell layer thickness in regulating and controlling the performance of the wave-absorbing material with the core-shell structure is illustrated, and a feasible strategy is provided for designing a high-performance light-weight wave-absorbing material with adjustable electromagnetic parameters and enhanced durability.

This invention provides a method for producing high-purity aluminum-niobium-tantalum master alloys and co-producing ammonium fluoride, belonging to the fields of metallic materials and inorganic chemicals. The invention involves mixing fluoroniobic acid, fluorotantalic acid, and ammonia water for a precipitation reaction to obtain a precipitate and an ammonium fluoride solution. The ammonium fluoride solution is then concentrated, cooled for crystallization, dehydrated, and dried sequentially to obtain ammonium fluoride. The precipitate is then dried and oxidized and calcined sequentially to obtain an oxide. The oxide, aluminum powder, potassium chlorate, and calcium fluoride are mixed and subjected to a vacuum aluminothermic reaction to obtain the high-purity aluminum-niobium-tantalum master alloy. This invention, considering both broadening the range of raw material selection and optimizing the production process, reacts fluoroniobic acid, fluorotantalic acid, and ammonia water to produce niobium hydroxide and tantalum hydroxide precipitates, which are then oxidized and calcined to form niobium and tantalum oxides. The high-purity aluminum-niobium-tantalum alloy is then prepared using a vacuum aluminothermic reaction. Simultaneously, ammonium fluoride can be co-produced, resulting in high raw material utilization.

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 vanadium-aluminum alloy and a preparation method thereof. The preparation method comprises the following steps: S101, coating the inner wall of a water-cooled copper crucible with a magnesium oxide coating; s102, vanadium pentoxide with the bulk density larger than 1.05 g / cm < 3 >, metal aluminum particles and a cooling agent are evenly mixed; s103, the mixed raw materials are added into a water-cooled copper crucible and subjected to water cooling, and after compaction, an aluminothermic reaction is triggered in the mode that an ignition agent is ignited on the upper portion; and after the thermit reaction is finished, water cooling is continuously carried out, and finally the finished vanadium-aluminum alloy is obtained. According to the preparation method, the water-cooled copper crucible is adopted as a reaction device, the solidification speed of alloy liquid can be increased, the specific gravity segregation of the alloy is effectively improved, and air holes in the alloy are reduced by controlling the bulk density of vanadium pentoxide, coating the inner wall of the crucible with a magnesium oxide coating and the like; therefore, the high-quality vanadium-aluminum alloy which is uniform in component, compact in crystal and free of obvious pores inside is obtained.

A material compacting device for a crucible thermit reaction comprises a base, a door-shaped support is fixed to the upper end of the base, two linear guide rails are arranged on the table top of the base, and the door-shaped support stretches across the two linear guide rails; a hydraulic lifting platform is arranged above the two linear guide rails, and the hydraulic lifting platform is connected with the two linear guide rails in a sliding mode through sliding blocks; a die is arranged above the hydraulic lifting platform, the die is composed of a male die and a female die, the female die is composed of a sleeve and a base, and the base and the sleeve are detachably sleeved; a pair of supporting shafts is arranged on the outer wall of the sleeve and rotationally installed in the middles of the two supporting columns of the door-shaped support. A first hydraulic cylinder is fixed above a top cross beam of the n-shaped support, and a piston rod of the first hydraulic cylinder penetrates through the cross beam to be fixedly connected with the upper end of the male die and can drive the male die to move up and down in the sleeve.

A method for producing a lithium solution according to the present disclosure comprises igniting a mixture of alpha-spodumene and metallic aluminum to cause a thermite reaction and bringing the reaction product into contact with a leaching agent to obtain a lithium solution. The leaching agent may be water or sulfuric acid. When the leaching agent is water, it is also possible to obtain a lithium solution by bringing water into contact with the reaction product without subjecting the reaction product to a sulfation treatment.

A kind of crucible for preparing aluminum vanadium alloy by aluminothermic reaction and its preparation method belong to powder metallurgy technical field.The different particle size aluminum vanadium slag is graded according to set proportion in the present application, by doping high-activity Al2O3 powder, low-melting-point anhydrous Na2CO3 powder, V2O5 powder and MgO powder, two or more of which reduce the self-powder rate of aluminum vanadium slag and forming temperature, the layered vibration form is used for filling, after drying, sintering at 810 DEG C ~ 890 DEG C for 10h ~ 15h, holding, cooling, to obtain the crucible for preparing aluminum vanadium alloy by aluminothermic reaction.The crucible provided by the present application has high density and high sintering strength, and has excellent corrosion resistance and service life.Simultaneously, when the method provided by the present application is used, vacuum or argon protection condition is not needed in sintering process, it can be realized in normal pressure air atmosphere, without vacuum system, the equipment and process are relatively simple, and the manufacturing cost is reduced.

The invention belongs to the field of vanadium-aluminum alloy smelting. The invention discloses a preparation method of a high-uniformity vanadium-aluminum alloy. The method comprises the following steps: uniformly mixing vanadium oxide, aluminum particles and a fluxing agent according to a first ratio, paving the mixture on the bottom layer of a smelting furnace, paving an ignition agent on the bottom layer material, and igniting; uniformly mixing the vanadium oxide, the aluminum particles and the fluxing agent according to the second ratio and the third ratio, and sequentially putting the mixture into the smelting furnace; after the aluminothermic reaction, the smelting furnace is subjected to standing and cooling and then is disassembled, slag and alloy in the smelting furnace are separated, the proportion of aluminum in the second proportion is higher than the proportion of aluminum in the first proportion and the proportion of aluminum in the third proportion, and the fluxing agent is a composite fluxing agent composed of CaF2, CaO and Na2CO3. According to the method, the raw material distribution mode and the components and proportion of the composite fluxing agent are optimized, the slag fluidity is improved, the vanadium yield is increased (larger than or equal to 98%), the impurity content in the prepared vanadium-aluminum alloy is reduced, and alloy segregation is inhibited.

The invention discloses an iron-based titanium carbide additive for improving toughness and wear resistance of steel as well as a preparation method and application of the iron-based titanium carbide additive, and relates to the technical field of alloy materials. The preparation method comprises the following steps: weighing the aluminum powder, the carbon source, the iron powder, the titanium dioxide powder and the calcium oxide powder in proportion, uniformly mixing the aluminum powder, the carbon source, the iron powder and the titanium dioxide powder to obtain mixed powder, and granulating into particles; pre-roasting the particles to obtain pre-roasted particles; mixing the weighed calcium oxide powder with a binder in proportion to obtain paste, coating the pre-roasted particles, then drying the coated pre-roasted particles, and preparing the coated pre-roasted particles into a core-spun yarn; and molten steel is molten, the cored wire is fed into the deep position of the molten steel for reaction, and the iron-based titanium carbide additive is obtained. Through the synergistic effect of low-temperature pre-roasting, calcium oxide coating and cored wire adding modes, the severe thermit reaction is controlled, Al2O3 inclusion is eliminated, the titanium yield and the product performance are remarkably improved, the cost is low, and industrial production is easy.

The method for producing the niobium-nickel intermediate alloy from the niobium-aluminum recycled materials comprises the following steps that materials are prepared, specifically, the niobium-aluminum recycled materials, nickel protoxide, calcium oxide, calcium fluoride and a heat generating agent are prepared according to the mass ratio of 1: (0.4-0.8): (0.01-0.05): (0.01-0.07): (0.1-0.4) and mixed to be uniform; treating the raw materials: drying the mixed materials at 100 DEG C to remove moisture; charging into a furnace; filling the mixed material into a reaction furnace body, compacting, and then spreading an ignition agent on the material for ignition to carry out aluminothermic reaction; according to the method, the niobium element in the niobium-aluminum recycled material is reduced through an aluminothermic reduction method, meanwhile, nickel protoxide is added in the reaction process, the nickel element is prepared, and a reducing agent is aluminum in the recycling rate; the one-step reduction reaction is adopted, independent niobium oxide does not need to be adopted while the niobium-nickel intermediate alloy is prepared, and recycling of useful elements in recycled materials is improved.

The present invention relates to the technical field of molybdenum-aluminum alloy preparation, and in particular to a method for preparing an aluminum-molybdenum alloy. The method comprises the following steps: mixing molybdenum trioxide, aluminum powder, and calcium oxide to obtain a mixture; igniting a portion of the mixture as a base material to initiate a thermite reaction; and continuously feeding the remaining mixture after the thermite reaction has occurred for 4 to 6 seconds to ensure the continued thermite reaction, thereby obtaining the aluminum-molybdenum alloy. The aluminum-molybdenum alloy produced by this method has stable quality and is suitable for large-scale production.

The invention provides an aluminum-niobium alloy for high-purity niobium and a preparation method of the aluminum-niobium alloy. The preparation method comprises the following steps: (1) pretreating high-purity niobium oxide, high-purity aluminum particles and a slag former, and mixing to obtain a mixed material; and (2) putting the mixed material obtained in the step (1) into a crucible of a vacuum thermit furnace, carrying out vacuum thermit reaction after vacuumizing treatment, and cooling along with the furnace to obtain the aluminum-niobium alloy for high-purity niobium, the vacuum aluminothermic reaction comprises laser ignition and laser heat treatment which are carried out in sequence. According to the method, the ignition mode of the vacuum thermit reaction is optimized, external impurities introduced in a traditional ignition mode are reduced, external energy can be provided for a reaction system, the slag-liquid separation effect is improved, the high-quality high-grade aluminum-niobium alloy is prepared, and meanwhile a production scheme is provided for a high-quality precursor for high-purity niobium.

A thermite composition for a process of plugging and abandoning a petroleum well comprises a tube-scaling composition and a gas leakage-preventing composition. The tube-scaling composition comprises aluminium and a metal oxide, and the gas leakage-preventing composition comprises a metal or an alloy with a melting point ranging from 100-300° C. The tube-scaling composition is arranged at the bottom, followed by the gas leakage-preventing composition. The thermite composition further comprises a tube-opening composition comprising aluminium and a metal oxide. The process of plugging and abandoning a petroleum well using the thermite composition involves introducing the thermite composition which is arranged in layers in the petroleum well to be plugged and abandoned, and initiating an ignition to trigger a thermite reaction, which melts the metal for tube sealing and prevents gas leakage.

The invention discloses a pretreatment method for reducing volatile matters in a smelting process of porous titanium prepared by a potassium fluotitanate aluminothermic method and application of the pretreatment method. The invention belongs to the field of metal impurity removal and smelting. The problems that in the prior art, in order to solve the smelting problem of preparing the porous titanium through a potassium fluotitanate aluminothermic method, the porous titanium skeleton structure is irreversibly collapsed and the porosity is reduced due to the fact that the porous titanium is treated through mechanical pressing, and C impurities are left when the porous titanium is pretreated in a bonding forming mode are solved. According to the method for eliminating the volatile impurities by utilizing the tubular furnace, the impurities in the porous titanium can be removed in a targeted manner by utilizing three-section calcination treatment of the tubular furnace, K2TiF6 which is not completely reacted and residual Al can be further subjected to an aluminothermic reaction, the mass loss is further reduced in the hydrogen plasma arc melting process, the impurities are not introduced, and the method is suitable for industrial production. The pretreatment method disclosed by the invention can also be used for recovering volatile matters and greatly reducing environmental pollution, and has remarkable social benefits and economic benefits.

The present invention relates to a pigment composition containing plate-shaped aluminum having excellent explosion stability and a method for preparing the same. More specifically, the present invention relates to a pigment composition and a method for preparing the same, wherein the pigment composition contains thin aluminum flakes coated with a plurality of metal oxide layers and TiO2 coated with a metal oxide layer, thereby ensuring explosion stability. The pigment composition of the present invention can ensure stability against the thermite reaction caused by aluminum and metal oxides and prevent a decrease in chromaticity and hiding power by mixing TiO2 coated with a metal oxide layer having an apparent specific gravity lower than that of other plate-shaped inorganic particles.

This invention relates to the field of metallic materials technology, specifically to a method for producing an aluminum-tungsten-tantalum ternary master alloy. The method involves mixing tantalum pentoxide, aluminum powder, and potassium chlorate, placing the mixture in a molten pool, igniting it with a magnesium strip, and cooling it to obtain an aluminum-tantalum alloy ingot. After removing the surface alumina from the ingot, the ingot is machined into chips in a glove box for later use. Tungsten trioxide, aluminum powder, and the chipped aluminum-tantalum alloy are then mixed and placed in a vacuum aluminothermic furnace. The furnace is closed, a vacuum is created, and a mixture of magnesium and potassium permanganate is sprayed in. The mixture is ignited to initiate a vacuum aluminothermic reaction. After the reaction occurs, the vacuum level in the furnace is increased, and the furnace is cooled. The furnace is then opened, and the slag is removed to obtain the aluminum-tungsten-tantalum alloy ingot. This invention combines metallothermic reduction with vacuum aluminothermic processes to prepare the aluminum-tungsten-tantalum ternary alloy, producing an aluminum-tungsten-tantalum alloy with high homogeneity and low gaseous impurities. This solves the problems of high melting point, high density, and high gaseous impurity content in traditional aluminothermic reaction production methods.

The invention provides a preparation method of a niobium-vanadium alloy, which comprises the following steps: a) mixing niobium oxide, excessive aluminum powder, an iron source and a slag former to carry out a first aluminothermic reaction, and separating a slag phase to obtain a ferroniobium intermediate alloy; and b) mixing the ferroniobium intermediate alloy, vanadium oxide, insufficient aluminum powder, an iron source and a slag former, carrying out a second aluminothermic reaction, and separating a slag phase to obtain the niobium-vanadium alloy. The invention further provides the niobium-vanadium alloy. According to the method, niobium is firstly reduced by adopting excessive aluminum, so that Nb2O5 which is difficult to reduce is fully reacted, and the recovery rate of niobium is increased; and then insufficient aluminum is adopted for reducing vanadium, excessive aluminum is prevented from remaining in the alloy on the basis that the vanadium reduction rate is guaranteed, and the purity of the alloy is improved. Experimental results show that the niobium-vanadium alloy meeting target components can be obtained through the method, high-value elements such as niobium and vanadium can be effectively recycled, for example, the recovery rate of niobium is larger than or equal to 98%, and the recovery rate of vanadium is larger than or equal to 96%.

The present application belongs to the technical field of refractory material, and discloses a self-propagating reaction sintering magnesium-aluminum spinel ramming material and a preparation method thereof. The ramming material comprises the following raw materials in mass fraction: 30-40 parts of spinel with a particle size of 3-6 mm, 5-15 parts of spinel with a particle size of 1-3 mm, 8-15 parts of magnesia with a particle size of less than 1 mm, 3-5 parts of silicon carbide with a particle size of less than 1 mm, 3-5 parts of silicon nitride powder, 2-5 parts of metal silicon powder, 8-12 parts of active alumina powder, 15-30 parts of magnesium peroxide powder, and 5-10 parts of metal aluminum powder, wherein the sum of the mass fractions of the above raw materials is 100 parts, and 1-2 parts of liquid binder is additionally added. The ramming material uses magnesium peroxide as the oxygen source to cause the aluminothermic reaction of metal aluminum, promotes the sintering of the material, uses silicon carbide and silicon nitride as the heat-conducting agent to rapidly transfer the released heat, uses alumina powder as the diluent to avoid the collapse caused by the excessive reaction heat stress, so that the ramming material successfully passes through the self-propagating reaction sintering, the sintering energy consumption is low, and the sintered product has excellent performance.