33 results about "Ferrovanadium alloy" patented technology

The invention discloses a wear-resistant flux-cored wire and a manufacturing method thereof, and belongs to the technical field of welding materials, the wear-resistant flux-cored wire is formed by wrapping three layers of flux cores with a low-carbon steel strip, the inner main wear-resistant layer contains chromium carbide, recycled slag, cobalt-based alloy and carbon nanofibers, and the outer main wear-resistant layer contains chromium carbide, recycled slag, cobalt-based alloy and carbon nanofibers; the gradient mixing layer is in gradient transition of inner and outer layer components; and the outer auxiliary wear-resistant layer contains tungsten carbide, ferrovanadium and electrolytic manganese powder. The preparation method comprises the steps of waste residue recovery treatment, ultrasonic dispersion and mixing, layered vibration compaction and cold drawing forming. Through three-layer structure collaboration, nano reinforcement and solid waste recovery, the wear resistance is improved by 20%-30%, the cost is reduced by 15%-20%, and the composite material is suitable for complex working conditions such as mines and metallurgy and has the advantages of being high in bonding strength, resistant to cracks, stable in process and the like.

The invention provides a method for preparing ferrovanadium from stone coal navajoite, which belongs to the technical field of metal mineral smelting and comprises the following steps: crushing and grinding stone coal navajoite, and drying to obtain dried stone coal navajoite powder; mixing the dried stone coal vanadium ore powder with an iron trapping agent, a reducing agent and a slagging material to prepare pellets; smelting the pellets at high temperature to obtain molten slag liquid; molten liquid obtained through molten slag-liquid separation is cooled to obtain vanadium-iron alloy, and obtained molten slag is quenched and tempered to obtain rock wool. The method for preparing the ferrovanadium alloy from the stone coal vanadium ore is simple in process, economical, efficient, environmentally friendly and high in vanadium recovery rate.

The invention discloses a method for prolonging the service life of a hard contact of a vanadium-iron alloy cake rough crushing machine, which comprises the following steps: carrying out rough crushing on a vanadium-iron alloy cake obtained after high vanadium-iron smelting is finished, crushing from the edge to the center of the vanadium-iron alloy cake during rough crushing, and cooling the alloy contact to normal temperature within 5-30 seconds after rough crushing is finished. According to the method, the reasonable slag type is controlled, the slag heat storage capacity and the inclusion absorption capacity are improved, the overheating state of the melt is improved through power-on heat preservation, it is ensured that micron-sized aluminum oxide inclusions in the alloy liquid float upwards fully, and the content of the micron-sized aluminum oxide inclusions left in the alloy is reduced; and growth of thick columnar crystal grains in the solidification process and generation of intergranular fracture in the coarse crushing process are facilitated, the quality of the finished ferrovanadium is improved, and the crushing difficulty and damage weightlessness of a hard contact of a coarse crushing machine are reduced. Not only is the yield improved, but also the service life of the hard contact of the ferrovanadium alloy cake rough crushing machine can be prolonged.

The present application relates to a vanadium-iron alloy smelting slag-gold separation control method, which comprises: a. mixing and smelting vanadium-iron alloy smelting raw materials including vanadium-containing materials, reducing agents, iron materials and slag characteristic regulators, and the first mass percentage of iron materials is used in step a; b. after the vanadium-iron alloy smelting raw materials are completely melted to form a molten pool, the smelting system is maintained in a molten state by power supply until the vanadium mass fraction in the molten slag is reduced by less than a predetermined value, and then slagging is performed; c. adding the second mass percentage of iron materials to the surface of the molten pool, and continuously supplying power for a predetermined time; d. after the reaction product is cooled, the slag-gold is separated to obtain a vanadium-iron alloy and a smelting corundum slag. The present application approximates the settlement of vanadium-iron alloy molten particles in the molten slag as free settlement in an infinite fluid, and based on this theory, the influencing factors of the slag-gold separation efficiency in the aluminum thermal reduction vanadium-iron alloy smelting process are obtained, the conditions of the alloy settlement conditions are effectively improved, and the efficient separation of the molten slag-gold is promoted.

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 relates to the technical field of vanadium smelting, and discloses a high-vanadium-iron alloy cake, a preparation method thereof and an alloy component analysis method.The preparation method comprises the steps that the thickness and the diameter of the alloy cake are determined based on the weight of a target alloy cake and the size of a furnace body; preparing a bedding material and performing bedding, wherein the bedding material comprises an arc striking material, a bedding main material and a bedding metal type cold material; after electrifying to strike an arc, smelting in a thin material layer form, dividing a main mixture into N parts, sequentially adding the N parts, and adding non-bottoming metal type cold materials in batches in the process of adding the main mixture; and then cooling is conducted, and a high-vanadium-iron alloy cake is obtained. According to the method, the relationship between the pole circle and the diameter of the alloy cake is properly matched, the material feeding mode is changed to uniformly distribute heat and improve the furnace condition, and the problems that the yield and the yield are reduced and acquisition of alloy component information is severely lagged due to the fact that the high-vanadium-iron alloy cake is difficult to crush can be effectively solved.

The invention relates to the technical field of vanadium metallurgy, in particular to a method for smelting ferrovanadium alloy through cooperation of multi-source materials. The method comprises the following steps that the multi-source materials including a vanadium oxide raw material, a vanadium-containing material, an aluminum reducing agent, an iron fusion agent and a slag former are collected, and chemical component data of the multi-source materials are obtained; according to the preset total content of the harmful elements, the multi-source materials are sorted in a unified mode and numbered in sequence; then, the numbered multi-source materials are distributed into N smelting furnaces according to a snakelike circulation distribution rule; and the multi-source materials distributed to the same smelting furnace are subjected to unified smelting control, and preparation of the ferrovanadium alloy is completed. By means of the method, homogenized distribution and intelligent cooperative burdening of harmful elements of the multi-source materials can be achieved, and the industrial problems that in traditional ferrovanadium smelting, the utilization rate of low-grade and high-impurity materials is low, component fluctuation is large, and the yield is unstable are effectively solved.

The present invention provides an inhibitor for suppressing slag splashing in the late stage of ferrovanadium smelting, comprising lime and metallic iron, wherein the mass ratio of the lime to the metallic iron is 80-150:20-50. The present invention also provides a method for suppressing slag splashing in the late stage of ferrovanadium smelting, wherein a ferrovanadium alloy molten pool and a ferrovanadium smelting slag layer are obtained through refining in a smelting furnace, and then the following steps are performed: (1) stopping power to the smelting furnace, removing the electrodes, and adding the inhibitor comprising lime and metallic iron to the ferrovanadium smelting slag layer; (2) allowing the smelting furnace to stand, allowing the lime to undergo an endothermic reaction with the ferrovanadium smelting slag; and (3) energizing and heating the smelting furnace again, causing the lime to melt on the surface of the ferrovanadium smelting slag layer to form a covering layer. The method described in the present invention has a short process flow, strong operability, and excellent slag splashing suppression effect.

The invention discloses a preparation method of high-formability stainless steel, which comprises the following steps: raw material preparation: selecting 30-50% of waste stainless steel, 20-30% of pure iron, 10-15% of ferrochrome, 8-12% of nickel-iron alloy, 1-3% of niobium-iron alloy and 1-3% of vanadium-iron alloy as raw materials; and the vanadium-iron alloy accounts for 0.5%-2%. According to the preparation method of the high-formability stainless steel, through the reasonable alloy element proportion and the scientific preparation process, the prepared high-formability stainless steel has good toughness and plasticity, the defects of cracking, wrinkling and the like can be effectively reduced in the complex forming process, the qualification rate and the production efficiency of products are improved, and the production cost is reduced. The waste stainless steel is used as part of the raw material, so that cyclic utilization of resources is realized, the production cost is reduced, meanwhile, the pollution of waste metal to the environment is reduced, and remarkable economic and environmental benefits are achieved.

The application discloses a smelting method for producing vanadium-iron alloy, which comprises the following steps: smelting in four stages, adjusting the mass of aluminum in the mixed material added in each stage according to the total mass of vanadium in vanadium-containing oxide; in the first three stages, adding the mixed material with a predetermined mass ratio into a tilting furnace in sequence for smelting, starting arc in the first stage to make the mixed material form a molten pool, and from the first stage to the third stage: controlling the voltage of the three-phase electrode to decrease in sequence, controlling the current of the three-phase electrode to increase in sequence, and controlling the depth of the three-phase electrode inserted into the reaction liquid to decrease in sequence, wherein, the slag is discharged once after the second stage of smelting is completed; in the fourth stage, the voltage is kept greater than or equal to the voltage in the third stage, the current is kept equal to the current in the third stage, and the depth of the three-phase electrode inserted into the reaction liquid is kept greater than or equal to the depth of the three-phase electrode inserted into the reaction liquid in the third stage, finally obtaining the vanadium-iron alloy, and realizing the fullness of the thermodynamics and kinetics of the smelting reaction.

A method for preparing a vanadium-aluminum alloy through an aluminothermy continuous casting method comprises the following steps that vanadium pentoxide, metal aluminum and sodium fluoride are mixed, ultrasonic treatment is conducted, and then vacuum treatment is conducted; and the metal powder is ignited for a reduction reaction, then aging treatment is conducted, and a ferrovanadium alloy product can be obtained. According to the method, ultrasonic treatment is adopted, so that more reaction sites exist between metal aluminum and sodium fluoride, and the violence of a follow-up ignition reaction can be slowed down. Aging treatment is adopted, the cooling rate can be accurately controlled, and internal defects of the vanadium-aluminum alloy are avoided. According to the vanadium-aluminum alloy, the mass percentage of V is larger than or equal to 80%; the sum of the mass percentages of C, Si, Fe, P, S, B, O, N, H and unavoidable impurities is smaller than or equal to 0.2%.

The invention discloses a treatment method of a vanadium-iron alloy and the vanadium-iron alloy. The method comprises the following steps: naturally cooling the vanadium-iron alloy to obtain a vanadium-iron alloy cake; the ferrovanadium alloy cake is kept in a first cooling environment for a first time period to be cooled for the first time till the temperature is not larger than a first preset temperature; the ferrovanadium alloy cake cooled for the first time is kept in a second cooling environment different from the first cooling environment for a second time period to be cooled for the second time till the temperature is not larger than a second preset temperature; and carrying out subsequent operation on the vanadium-iron alloy cake subjected to secondary cooling to obtain the vanadium-iron alloy. According to the scheme provided by the invention, the problems of high safety risk, long cooling time, high ferrovanadium alloy hardness, long crushing time, high fine powder rate, high loss of crushing equipment, high failure rate, low production efficiency of a crushing system and the like existing in a primary water cooling mode in the prior art can be solved.

The utility model discloses continuous filling equipment for ferrovanadium alloy particle packaging, which comprises a rack and a hopper, the hopper is arranged on the side wall of the rack, a support table is arranged below the hopper, a rotation control mechanism is arranged on the support table, a rotation table is arranged on the rotation control mechanism, and the rotation table is arranged on the side wall of the rack. Four groups of weighing tables are arranged on the rotating table along an annular array, and an empty barrel conveyor and a heavy barrel conveyor are arranged on the two sides of the supporting table respectively. A packaging barrel is placed on a weighing table on a rotating table through a feeding mechanical arm, a rotation control mechanism is controlled to rotate, the empty packaging barrel is moved to the position below a hopper, a telescopic filling assembly is controlled to stretch into the packaging barrel, and a servo driving assembly is started to conduct rotation control over a spiral feeding rod; and therefore, the ferrovanadium alloy particles in the hopper are pushed to be put into the packaging barrel through the discharging pipe and the telescopic filling assembly.

The application discloses a method for controlling the content of aluminum in ferrovanadium alloy, comprising the following steps: calculating the effective oxygen content according to the total content of vanadium oxide, the total content of potassium and sodium, the content of sulfur element and the content of oxygen in volatile sulfur dioxide in the reaction raw materials; calculating the corrected reference aluminum distribution factor according to the effective oxygen content and the reference aluminum distribution formula; calculating the distribution amount according to the demand of preparing ferrovanadium alloy by electric aluminum thermal reaction, wherein the aluminum distribution amount is determined according to the corrected reference aluminum distribution factor; weighing each raw material and mixing the raw materials to obtain a mixture; smelting the mixture by electric smelting; refining; air cooling, disassembling the furnace, removing the alloy cake and water quenching after the refining is completed; crushing and finishing the alloy cake to obtain the ferrovanadium alloy. The application also provides the ferrovanadium alloy prepared by the method. The method can stably control the content of aluminum in the alloy.

The invention discloses a feeding device and a ferrovanadium smelting method.The feeding device is used for feeding materials to an electric furnace for smelting ferrovanadium and comprises a first stock bin, a second stock bin, a third stock bin and a fourth stock bin, the second stock bin is used for containing a refining agent; the electromagnet is arranged in the second stock bin, when the electromagnet is in a first state, the electromagnet is used for adsorbing iron magnetic substances in the refining agent, and when the electromagnet is in a second state, the electromagnet releases the iron magnetic substances; an inlet of the first discharging channel is connected with the first stock bin, and an outlet of the first discharging channel is located above the electric furnace; and an inlet of the second discharging channel is connected with the second stock bin, and an outlet of the second discharging channel is connected with the first discharging channel. According to the scheme provided by the invention, electromagnetic force is introduced, a refining agent feeding device is further designed, ferrovanadium smelting and refining processes are optimized, partition and bin division are realized, and adverse effects caused by material mixing during discharging of a refining material and a vanadium-containing mixture in a common bin are avoided from the source.

The invention discloses a production method of a vanadium-iron alloy. The production method comprises the following steps: S1, selecting high-impurity vanadium-aluminum alloy crushed aggregates and polishing wastes, vanadium pentoxide, iron oxide powder, aluminum particles, calcium oxide and a heat generating agent; s2, treating the raw materials treated in the step S1; s3, uniformly mixing the crushed vanadium-aluminum alloy, the polishing waste, vanadium pentoxide, iron oxide powder, aluminum particles, calcium oxide and a heat generating agent to form a mixture; s4, a reaction furnace is selected, and a high-alumina refractory material with the particle size of 1-5 mm is laid at the bottom of a reaction furnace body; s5, filling the mixture into a reaction furnace body, compacting, spreading an ignition agent on the material for ignition, and carrying out aluminothermic reaction; s6, discharging after cooling; according to the method, the crushed vanadium-aluminum alloy with high impurity content and the polished waste are converted into the vanadium-iron alloy through an aluminothermic method, and recycling of the waste is achieved.

The invention provides a preparation method of ultralow-nitrogen-content high-vanadium iron. The preparation method comprises the following steps that S1, silicon iron powder is laid at the bottom of high-vanadium iron preparation equipment; s2, burdening according to the composition proportion of the high-vanadium iron, and electrifying the burdened raw materials for arcing and smelting; and S3, after smelting is finished, electrifying is stopped, then a refining agent is blown to the slag layer, submerged arc electrifying heating continues after blowing is finished, then nitrogen is removed from the slag surface, and finally obtained high-vanadium iron is quenched. In the preparation method of the ultralow-nitrogen-content high-ferrovanadium, the sulfur load and the carbon load in a ferrovanadium system are reduced by adopting a high-proportion low-sulfur flake vanadium furnace burden and further combining the means of strengthening slag refining, shortening the electrifying smelting time and the like, and meanwhile, submerged arc electrifying heating is performed in a slag layer so as to reduce the ionization effect of a graphite electrode arc on nitrogen in air; therefore, the nitrogen content in the ferrovanadium alloy is reduced, and finally the N content in the ferrovanadium is smaller than or equal to 0.04%.

The present application relates to a kind of methods for regulating vanadium iron alloy slag characteristics and smelting efficiency, steps are: vanadium oxide, first vanadate, aluminum particle, iron filings and lime are mixed to obtain first batch mixture, vanadium oxide, second vanadate, aluminum particle, iron filings and lime are mixed to obtain second batch mixture, and first and second batch mixture are subjected to aluminothermic reaction respectively, electrode auxiliary heating is used after reaction ends;The above operation is repeatedly performed to carry out N period batch feeding and smelting operation, wherein N≥2 and is integer, and lime is supplemented to form slag before the end of smelting in each of the first to N-1 period, and slagging operation is carried out once;After the N period smelting is completed, lime is supplemented to form slag, and slag iron is discharged after slagging ends.The present application makes full use of the advantages of vanadate, such as large heat release, good mass transfer condition, and by adjusting the addition method of slagging agent, the composition of molten slag at different stages is improved, the characteristics of molten slag are improved, so that efficient reduction and separation of smelting process are realized.

The invention relates to the technical field of vanadium metallurgy, and discloses high-vanadium iron for tool and die steel and a preparation method thereof.The method comprises the steps that waste silicon-molybdenum heating elements are smashed to obtain silicon-molybdenum heating element powder; the method comprises the following steps: mixing silicon-molybdenum heating element powder with a vanadium-iron alloy mixture, igniting, carrying out first-stage electrified smelting, controlling the content of residual vanadium element in slag to be within a first target range, uniformly adding a trapping agent to the surface of the slag, and continuously lowering an electrode to carry out second-stage electrified smelting; controlling the content of the residual vanadium element in the slag to be reduced to a second target range, stopping electrifying, and cooling along with the furnace to obtain the high-vanadium iron for the tool and die steel. The method solves the problems that the waste silicon-molybdenum rod is high in recovery pollution, the high-end ferrovanadium alloy is high in cost, and the applicability of the high-end ferrovanadium alloy in tool and die steel is insufficient. The comprehensive purposes of waste recycling, product high performance and production cost reduction and efficiency improvement are achieved by taking the waste as the raw material and precisely controlling the smelting process.

The present application belongs to the technical field of vanadium iron smelting equipment, and particularly relates to a split type furnace body for vanadium iron production. The split type furnace body for vanadium iron production comprises a cylinder, a base plate and a clamp, the lower end of the cylinder is clamped with the base plate, the edge of the base plate is provided with a ring of a baffle, the inner diameter of the baffle is greater than the outer diameter of the cylinder, the side walls of the cylinder and the baffle are provided with a plurality of matched limiters, the matched limiters are a group of limiting assemblies, the clamp is clamped and connected with the limiting assemblies, and the side wall of the cylinder is further provided with a plurality of lugs for hoisting. When the split type furnace body for vanadium iron production is used, the vanadium iron alloy is not tilted, the kinetic energy of the tied material is far less than that of the tilting mode, at the same time, the vanadium iron alloy will not collide with the tied material, and the generation of dust is effectively inhibited.

The present invention belongs to the technical field of hydrogen storage materials, and discloses a zirconium-free, vanadium-free and low-cost AB2-type titanium-manganese-based hydrogen storage alloy and a preparation method thereof, so as to solve the problem that the existing AB2-type titanium-manganese-based hydrogen storage alloy contains zirconium, vanadium or ferrovanadium alloy. The molecular general formula of the hydrogen storage alloy is TiMn 2‑a‑b Ti a M b +x wt% R, wherein 0 < a ≤ 0.35, 0 ≤ b ≤ 1, 0 < x ≤ 5, M is one or more of Cr, Fe, Ni, Cu, Al, Si, Mo, Sn, and R is one of rare earth metals Ce, La, Sm, Y. The hydrogen storage alloy of the present invention is zirconium-free, vanadium-free and low-cost; the hydrogen storage alloy is extremely easy to activate and can be activated by one hydrogen absorption and desorption at room temperature; the hydrogen storage alloy has a high capacity, good kinetic performance and small hydrogen absorption and desorption hysteresis.

This invention discloses a vanadium extraction method using synergistic combinations of vanadium-containing minerals, comprising the following steps: mixing vanadium shale ore, vanadium-titanium magnetite, and additives; grinding the mixture to obtain activated minerals; then reducing and roasting the activated minerals to obtain reduction products; and finally crushing the reduction products to obtain ferrovanadium alloy and titanium-containing slag phase. This vanadium extraction method fully utilizes the high TFe content in vanadium-titanium magnetite and the high carbon content in vanadium shale ore, leveraging their synergistic effect to fully utilize the inherent properties of the minerals, reducing the use of additives, and increasing the metal extraction rate. A simple process can simultaneously extract vanadium metal from two complex ores, vanadium shale ore and vanadium-titanium magnetite, avoiding the complex process routes and pollutant emissions associated with traditional blast furnace smelting for vanadium extraction from vanadium-titanium magnetite and traditional roasting of vanadium shale ore.

The invention relates to the technical field of vanadium metallurgy, and provides a low-grade ferrovanadium alloy smelting method which comprises the following steps: mixing vanadium slag, ball-milled iron particles, aluminum particles and lime to obtain a ferrovanadium smelting mixture; carrying out aluminothermic reduction reaction on the mixture in a smelting electric furnace; the smelting process is controlled until the reaction is completed, and then separation is performed to obtain the low-grade ferrovanadium alloy; wherein the ball-milled iron particles serve as an iron source and a supplementary vanadium source, the ball-milled iron particles and the vanadium slag jointly provide vanadium and iron elements in the alloy, the lime serves as a slag former, and the dosage of the vanadium slag, the aluminum particles, the ball-milled iron particles and the lime meets the requirement that aluminum in the mixture is sufficient to reduce vanadium oxide in the vanadium slag and the ball-milled iron particles. According to the method, efficient, clean and resource utilization of the two solid wastes of the vanadium slag and the ball-milled iron particles is achieved on the whole, and the production cost of the low-grade ferrovanadium is remarkably reduced.

The invention provides a method for reducing impurities and aluminum consumption in ferrovanadium smelting, which comprises the following steps: A) pouring particle steel subjected to coarse screening into water for physical separation to obtain a first screened material with the particle size of less than or equal to 2.5 mm, a second screened material with the particle size of more than 2.5 mm and less than or equal to 25 mm and a third screened material with the particle size of more than 25 mm; b) carrying out shaking table separation on the first screened material to obtain quality-improved particle steel powder and vanadium slag; the second screening material is sorted through a jigger, and quality-improved steel particles and vanadium slag are obtained; the third screened material is subjected to high-pressure water spraying cleaning, and quality-improved particle steel blocks and vanadium slag are obtained; and C) drying the quality-improved particle steel powder, the quality-improved particle steel particles and the quality-improved particle steel blocks, mixing the dried quality-improved particle steel powder, quality-improved particle steel particles and quality-improved particle steel blocks with ferrovanadium smelting raw materials in proportion, and smelting to obtain the ferrovanadium alloy. According to the method, on the premise that the yield is not affected, the problem that in the process of smelting ferrovanadium from particle steel, aluminum consumption is high is solved, and the problem that the vanadium content in the alloy fluctuates greatly is solved.

This invention relates to the field of hydrogen storage technology, and discloses a modified TiFe-based hydrogen storage alloy and its preparation method. The modified TiFe-based hydrogen storage alloy includes a TiFe-based hydrogen storage alloy and a vanadium-iron alloy; the general chemical formula of the TiFe-based hydrogen storage alloy is TiFe. a Cr b Mn 0.09‑b Co c RE d The elements are: 0.73≤a≤0.88, 0≤b≤0.04, 0.02≤c≤0.03, 0.01≤d≤0.05, and RE is at least one of La, Ce, Y, Sm, Nd, and Pr; the mass ratio of the TiFe-based hydrogen storage alloy to the ferrovanadium alloy is 1:(0-0.04). The modified TiFe-based hydrogen storage alloy of this invention can simultaneously achieve good activation performance, high maximum hydrogen storage capacity, high effective hydrogen release capacity, and low plateau tilt coefficient.

The invention provides a chromium-containing ferrovanadium alloy and a preparation method thereof, and the chromium-containing ferrovanadium alloy comprises the following components in percentage by weight: 48-52% of vanadium, 1.0-5.0% of chromium, less than or equal to 1.0% of aluminum, less than or equal to 0.2% of carbon, less than or equal to 0.5% of silicon, less than or equal to 0.5% of manganese, less than or equal to 0.05% of phosphorus, less than or equal to 0.05% of sulfur and the balance of iron and inevitable impurities. By optimizing the chemical components of the vanadium-iron alloy and controlling the content of each element, the crushing performance of the vanadium-iron alloy is improved, and the fine powder rate of an alloy finished product in the stages of crushing, packaging, transporting and the like is reduced; according to the invention, the aluminothermic synergistic reduction process of vanadium, chromium and nickel oxides is adopted, so that the alloy manufacturing cost is effectively reduced, and the utilization rate of precious metals is further improved; the prepared vanadium-iron alloy contains microalloying elements such as chromium, titanium and nickel, so that the comprehensive mechanical property of the vanadium-containing alloy steel can be further improved, and the vanadium-iron alloy can be widely applied to the high-end fields such as aerospace and ocean engineering.

The invention relates to the technical field of vanadium metallurgy, and provides a controlled-cooling crystallization separation method of ferrovanadium alloy, which comprises the following steps: pouring molten ferrovanadium alloy into a capped ingot mold, slowly cooling at a cooling rate of 55-65 DEG C / h, keeping the temperature and slowly cooling to 1538-1394 DEG C in the ingot mold, demolding, and continuously and slowly cooling to 770-912 DEG C in air; and after slow cooling is finished, the demolded alloy ingot is rapidly cooled to the room temperature with water as a cooling medium at the cooling rate of 60-75 DEG C / h, and separation of a slag layer and an alloy matrix is achieved. According to the scheme, through the staged cooling strategy of'slow first and fast second ', active regulation and control of the alloy solidification behavior and the stress state are achieved, and the collaborative optimization target of grain blocking, fine powder rate reduction and automatic slag-iron separation is achieved.

The invention relates to the technical field of ferrovanadium smelting, and provides a ferrovanadium alloy smelting method which comprises the following steps: crushing and screening blocky foundry returns to obtain foundry returns with different size fractions; the pretreated foundry returns are divided into a first particle fraction and a second particle fraction according to the particle size, the particle size of the second particle fraction is larger than that of the first particle fraction, and vanadium pentoxide and the foundry returns of the first particle fraction are used for preparing a base material; preparing a main material from vanadium trioxide and the foundry returns of the second size fraction, pre-dividing the main material into a plurality of batches, and preparing a flux material; the method comprises the following steps: igniting the base material, and then carrying out the following operations in batches: firstly adding a flux material into a furnace, then adding a batch of main materials, and electrifying and heating until all batches of main materials are completely added; and after cooling, the furnace is disassembled to remove the vanadium-iron alloy. According to the technical scheme, speed increase and efficiency improvement of ferrovanadium smelting are achieved.

The present application relates to the alloy smelting technical field, specifically relates to a kind of vanadium-iron furnace charge structure and the method for improving the fine grinding performance of vanadium-iron alloy.The furnace charge structure of the present application is set by specific level and component, and the vanadium-iron alloy is obtained by furnace charge distribution, ignition fuel surface, power smelting, power refining after injection, two-step cooling.The method of the present application fully utilizes the mechanism of energy-containing material automatic heat accumulation by hierarchical distribution, improves the vanadium-iron slag refining effect, improves the vanadium yield, and at the same time, by introducing alloying material through injection, the fine grinding characteristics of vanadium-iron alloy are improved by combining two-step forced cooling measures.

The invention relates to the field of comprehensive recovery of vanadium-containing stone coal resources, in particular to a method for preparing ferrovanadium from vanadium-containing stone coal. The method comprises the following steps: mixing vanadium-containing stone coal with a sulfuric acid solution, carrying out pressure leaching under a preset oxygen pressure condition, and carrying out solid-liquid separation to obtain vanadium-containing leachate and leaching residues; carrying out oxidation precipitation reaction on the vanadium-containing leachate in an ozone atmosphere, and carrying out solid-liquid separation to obtain ferrovanadium precipitates and precipitation mother liquor; concentrating and crystallizing the precipitation mother liquor to obtain an aluminum sulfate product; the leaching residues are subjected to flotation after being finely ground, and carbon concentrate and silicon tailings are obtained through separation; and mixing the ferrovanadium precipitate with the carbon concentrate, smelting in a reduction electric furnace, and cooling to obtain the ferrovanadium alloy. According to the method disclosed by the invention, through a compound process of'pressurized acid leaching-ozone oxidation precipitation-flotation carbon extraction-reduction smelting ', efficient synergistic recovery of multiple elements such as vanadium, iron, aluminum, carbon and the like in the vanadium-containing stone coal is realized.