957 results about "Iron alloys" patented technology

The invention discloses a 340MPa grade P-containing hot-dip galvanized iron alloy high-strength IF steel, the chemical composition of which is as follows by weight: C: ≤0.003%, Si: ≤0.03%, Mn: 0.35-0.65%, P: 0.03-0.075%, S≤0.010%, Als: 0.020-0.045%, Nb: 0.008-0.015%, Ti: 0.02-0.03%, B: 0.0004-0.0010%, N≤0.0035%, and the remainder is Fe and unavoidable impurities; The elements also meet the following restrictions: calculated according to the corresponding weight percentage of each element, 10C+3N+2S≤Ti+2Nb≤12C+3N+2S, 60B≤P≤80B; the present invention adds P element to IF steel, and through composition and process optimization control, obtains a P-containing hot-dip galvanized iron alloy high-strength IF steel with a yield strength of 180-320 MPa, a tensile strength of 340-440 MPa, an elongation of 35-46%, a value (average plastic strain ratio) ≥1.8, high surface quality, high formability, and good cold brittleness.

The invention provides a high-capacity hydrogen storage alloy and a preparation method thereof. According to the method, the ferrovanadium alloy serves as a base body, rare earth is adopted for refining the ferrovanadium alloy, metal elements are doped, and the heat treatment process is further optimized. The hydrogen storage alloy comprises the following elements: TiaCrb (FeV + zwt.% RE) xMy, FeV represents a vanadium-iron alloy; rE represents a rare earth element, and z represents a doping amount; m comprises at least one element of Mn, Co, Ni, Cu, Zr, Zn, Al and Mo; a, b, x and y respectively represent the number of atoms of Ti, Cr, FeV and M, a + b + x + y = 100, 10 < = a < = 60, 0 < = b < = 70, 10 < = x < = 70, 0 < = y < = 10, and 0 < = z < = 10. The maximum hydrogen absorption amount of the prepared hydrogen storage alloy is 3.3 wt% or above at the temperature of 25 DEG C and the pressure of 9 MPa; the effective hydrogen absorption amount is more than 2wt%.

The invention discloses a method for preparing anisotropic samarium-iron-nitrogen magnetic powder, and belongs to the technical field of magnetic materials, the method comprises the following steps: preparing Sm and Fe according to design components, and smelting to obtain samarium-iron alloy molten steel; casting the samarium-iron alloy molten steel onto a cooling roller to obtain an iron-samarium alloy sheet; the iron-samarium alloy sheet is placed in a vacuum heat treatment furnace to be subjected to homogenization treatment, the alloy sheet obtained after homogenization treatment is cooled to 200-300 DEG C, in the vacuum environment, hydrogen is introduced into the furnace, the absolute pressure of the hydrogen is controlled to be 0.05-0.1 MPa, and hydrogenation treatment is conducted for 2 h; after hydrogenation is completed, the temperature is increased to 400 DEG C, nitrogen is introduced to 0.5 MPa, the temperature is increased to 530 DEG C, then the furnace temperature is reduced to the room temperature, and the anisotropic samarium-iron-nitrogen magnetic powder is obtained.The preparation method of the samarium-iron-nitrogen magnetic powder has the advantages of being simple in preparation process, low in energy consumption, high in production efficiency, small in magnetic powder particle size, high in magnetic performance and good in magnetocrystalline anisotropy.

The invention belongs to the technical field of solid oxide batteries, and discloses a nickel-iron support body of a metal-supported solid oxide battery, a total battery and a preparation method. The nickel-iron supporting body of the metal-supported solid oxide battery is made of a nickel-iron alloy material in a reducing atmosphere, a gradient pore structure with gradient pore distribution is prepared and formed through a double-layer casting phase inversion process, and the gradient pore structure is a composite structure comprising a finger-shaped pore channel layer and a skin layer. Compared with a ceramic material, the composite material has higher mechanical strength and thermal conductivity, can better bear thermal shock and mechanical stress, is particularly suitable for high-temperature and rapid thermal cycle working environments, and can keep good structural stability under the rapid heating condition of 50 DEG C / min.

The invention discloses a cyanide-free cadmium-iron alloy plating process for high-strength structural steel. The cyanide-free cadmium-iron alloy plating process comprises the step that a nickel-titanium alloy plating layer, a cyanide-free cadmium-iron alloy plating layer and a hexavalent chromium passivation film are sequentially prepared on a high-strength structural steel substrate from inside to outside. The prepared sample piece is subjected to a hydrogen brittleness test according to HB 5067.1-2005 Part 1 of hydrogen brittleness test of plating process: Mechanical Method, and the test result meets the standard requirement; the surface of a plated part is free of white rust after being subjected to an acetate mist test for 400h according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, and a plating layer of the plated part has excellent corrosion resistance; according to GB / T 5270-2005 < GB / T 5270-2005 < GB / T > 5270-2005 < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB /

The invention discloses an iron alloy electrode paste and a preparation process, and belongs to the technical field of electrode paste preparation, the iron alloy electrode paste comprises a composite aggregate system and a composite binder system, the composite aggregate system comprises the following components by mass: 40-60% of anthracite aggregate, 15-25% of artificial graphite flake, and 3-8% of silicon carbide whisker; the composite binder system comprises the following components in percentage by mass: 70-80% of medium-temperature modified coal pitch, 10-15% of furan resin and 5-10% of dispersion liquid containing nano boron carbide, and the composite binder system is combined with the composite aggregate system through a gradient permeation process to form a three-dimensional conductive network and an enhanced interface; the composite aggregate system and the composite binder system are optimally proportioned, and gradient permeation and gradient kneading processes are combined, so that the comprehensive performance of the electrode paste is remarkably improved, the thermal shock resistance is greatly improved and the linear shrinkage rate is reduced while low resistivity is maintained, the electrode paste is suitable for smelting ferroalloys such as silicomanganese and ferrochromium, and the service life is remarkably prolonged.

The invention relates to the technical field of magnetic materials, in particular to high-performance samarium-iron-nitrogen powder and a preparation method and application thereof. The invention provides a preparation method of samarium-iron-nitrogen powder, which comprises the following steps: (1) mixing Sm2O3 powder, Fe powder and a Ca reducing agent, and carrying out reduction reaction to obtain samarium-iron alloy; (2) mixing and crushing the samarium-iron alloy, mixing the crushed samarium-iron alloy with a dispersant and a passivation solution, carrying out ball milling, separating, and drying to obtain samarium-iron alloy powder; (3) nitriding the samarium-iron alloy powder to obtain samarium-iron-nitrogen powder; wherein the dispersing agent is selected from at least one of alkali metal phosphates; the passivation solution comprises chromium chloride, nitric acid, sulfuric acid and colloidal silicon dioxide. The samarium-iron-nitrogen powder prepared through the method has good magnetic performance.

The invention discloses a tungsten-nickel-iron alloy strength and toughness dual-objective optimization method and system based on machine learning, and the method comprises the following steps: obtaining original data of the components, sintering process, processing process, heat treatment process, strength and toughness of a tungsten-nickel-iron alloy, and carrying out the integration and summarization, so as to obtain an initial data set; preprocessing the initial data set to obtain a processed data set; constructing a plurality of candidate models based on a machine learning algorithm, screening the plurality of candidate models, and training the screened optimal candidate model by using the processed data set to obtain a prediction model; performing strength and toughness prediction on the target tungsten-nickel-iron alloy by using the prediction model to obtain a prediction result; and on the basis of the prediction result, candidate alloys meeting the application requirements are screened out, a dual-objective optimization framework is constructed by using a Pareto optimal criterion to optimize the candidate alloys, and the alloy with the strength and toughness cooperatively optimized is obtained.

The invention belongs to the technical field of metal coatings, and provides a corrosion-resistant high-temperature steel composite material and a preparation method and application thereof.The preparation method comprises the steps that pure iron, ferromolybdenum alloy, ferrochrome alloy, ferromanganese alloy and ferrosilicon alloy serve as raw materials; the corrosion-resistant high-temperature steel composite material is obtained sequentially through smelting refining, casting forming, quenching and tempering heat treatment, sand blasting roughening, laser cladding, nitriding treatment and micro-arc oxidation treatment. The invention provides a full-process production method of a corrosion-resistant high-temperature steel composite material, which comprises the following steps: carrying out smelting refining, casting molding and quenching and tempering heat treatment on pure iron and an alloy material as raw materials to obtain alloy steel with better mechanical properties; and then the alloy steel is subjected to surface modification treatment by adopting combination of three processes of laser cladding, nitriding treatment and micro-arc oxidation, so that the mechanical property of an alloy steel product is further improved, and the alloy steel is endowed with excellent corrosion resistance and wear resistance.

The invention belongs to the technical field of austenitic heat-resistant steel, and provides ternary trace element co-doped corrosion-resistant heat-resistant steel and a preparation method thereof.The preparation method comprises the steps that pure iron, ferrosilicon alloy, ferrochrome alloy, ferro-nickel alloy, ferro-molybdenum alloy, ferrotungsten alloy and cobalt powder serve as raw materials; and sequentially carrying out molten steel smelting, refining purification, casting molding, quenching and tempering heat treatment and nitriding treatment to obtain the ternary trace element co-doped corrosion-resistant heat-resistant steel. The austenitic heat-resistant steel with excellent mechanical property and corrosion resistance is prepared by doping the molybdenum element, the cobalt element and the tungsten element into the steel matrix and combining different carburizing treatment processes.

The invention relates to the technical field of welding rods for automatic welding of 2205 duplex stainless steel, in particular to a welding rod for automatic welding of 2205 duplex stainless steel and a preparation method of the welding rod. When the residual stress at the welding seam of the 2205 duplex stainless steel is eliminated through heat treatment, the tensile strength and the corrosion resistance of the welding seam can be remarkably reduced. In order to solve the technical problems, the welding rod for 2205 duplex stainless steel automatic welding comprises a flux core and a coating, the coating is formed by evenly mixing a binding agent and welding flux powder, and titanium-iron alloy powder, zirconium-iron alloy powder and niobium-iron alloy powder are added into components of the welding flux powder at the same time; according to the method, the contents of Ti, Zr and Nb elements in the electrode coating are increased, so that the purposes of refining grains of a weld joint and stabilizing ferrite are achieved, transformation of ferrite to austenite in the high-temperature heat treatment process of the weld joint is reduced, a proper amount of iron powder is added into the electrode, and the efficiency of automatic welding is greatly improved.

The invention provides composite magnetically soft alloy powder and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing iron alloy powder, a doped metal source and a first solvent, carrying out one-step drying treatment to obtain a mixed dry material, and carrying out heat treatment on the mixed dry material to obtain a composite material; (2) mixing the composite material, a passivating agent and a second solvent, and performing two-step drying treatment to obtain composite magnetically soft alloy powder; wherein the doped metal source comprises colloidal metal and / or a metal simple substance, and the melting point of the metal simple substance is less than or equal to 800 DEG C.

The present invention pertains to the fields of materials engineering and nanotechnology. More specifically, the invention discloses the use of an iron alloy comprising a mass quantity of a niobium species as a vehicle component material and a method for adjusting the mechanical properties of a metallic material comprising the incorporation of a niobium species. The products comprising use of the inventive iron alloy exhibit remarkable properties, such as improved mechanical properties combined with reduced weight, resulting in an exponential performance gain. In one embodiment, the alloy used in the invention is called Steeron, because it has steel characteristics while being a cast iron.

The invention provides a method for preparing high-purity titanium from ferrotitanium complex ore, and relates to the technical field of nonferrous metallurgy. The method comprises the following preparation steps: calculating and adding a carbonaceous reducing agent according to the components of the ferrotitanium complex ore and a specific principle, mixing and pelletizing, and reducing to generate a Fe (alloy)-TiC-MOx mixture; according to the content of TiC and Fe in the mixture, adding metal iron powder and Fe2O3 or iron ore concentrate according to a certain stoichiometric ratio, mixing, pelletizing, and reducing to obtain a titanium-iron alloy; and the obtained ferrotitanium alloy serves as a soluble anode, and high-purity titanium is prepared through electrolysis in halide molten salt containing low-valence titanium salt. According to the method, the reaction characteristic of iron and iron oxide with TiC at high temperature is utilized, the ferrotitanium alloy is generated from the ferrotitanium complex ore to serve as the soluble anode, then the high-purity titanium is prepared through molten salt electrolysis, the adverse effects of component deviation and anode precipitates existing in the soluble anode containing the titanium compound are avoided, and meanwhile casting forming is easy, and the method is more suitable for industrialization.

The invention provides a composite wave-absorbing material as well as a preparation method and application thereof, and relates to the technical field of wave-absorbing materials. The composite wave-absorbing material provided by the invention has high-entropy ferrite with a spinel structure and high-entropy iron alloy with a body-centered cubic structure, the chemical formula of the high-entropy ferrite is (CoxNiyCuzMnaZnbMgcCrd) Fe2O4, x + y + z + a + b + c + d = 1, x, y and z are real numbers greater than 0 and less than 1, a, b, c and d are real numbers greater than or equal to 0 and less than 1, and two or three of a, b, c and d are equal to 0. The composite wave-absorbing material provided by the invention has the advantages of thin matching thickness, strong wave-absorbing performance and wide absorption frequency band.

The invention discloses a high-performance ultrathin rare earth permanent magnet sheet and a preparation method thereof, and belongs to the technical field of rare earth permanent magnet material preparation. The preparation method comprises the following steps: melting an iron raw material and a part of a samarium raw material under a vacuum condition, then adding the balance of samarium, continuously melting, and pouring the obtained molten alloy onto a cooling roller to obtain a samarium-iron alloy sheet; the samarium-iron alloy sheet is sequentially subjected to homogenization treatment, hydrotreating and nitriding treatment, and nitrided magnetic powder is obtained; adding phosphoric acid and a corrosion inhibitor into the magnetic powder, carrying out wet ball milling, and drying to obtain surface-treated magnetic powder; adding a binder into the surface-treated magnetic powder, and banburying to obtain magnetic particles; the magnetic particles are pressed by a press vulcanizer, the thickness of the prepared rare earth permanent magnetic sheet is only 0.2 mm-0. 4mm, and the magnetic sheet is high in corrosion resistance, sufficient in surface magnetism, high in magnetic performance, low in preparation cost and capable of meeting application requirements of specific scenes.

The invention belongs to the technical field of material preparation, and discloses a preparation method of an alloy film loaded noble metal electrode for alkaline hydrogen evolution, and the preparation method comprises the following steps: firstly growing a nickel-iron alloy film on foamed nickel through constant-current deposition, then dipping in a ruthenium trichloride aqueous solution, reducing trivalent ruthenium ions into metal ruthenium under the action of the foamed nickel, and finally obtaining the metal electrode loaded with noble metal. The sample is anchored on the alloy film in the form of ruthenium nano-particle clusters, and the sample has ultralow ruthenium loading capacity. The obtained alloy film is smooth and uniform, uniform distribution of active sites is facilitated, electron transfer is accelerated, meanwhile, the ruthenium nanocluster with the proper size is loaded by controlling the dipping condition, the hydrogen evolution reaction is promoted, the hydrogen adsorption process is optimized through the synergistic effect between the ruthenium nanocluster and the nickel-iron alloy, and the hydrogen adsorption efficiency is improved. And the hydrogen evolution reaction kinetics of the material is improved. The obtained self-supporting catalyst has excellent performance which is superior to that of a Pt / C catalyst, still keeps excellent stability under industrial-grade large current density, and has a wide application prospect.

The invention discloses a method for preparing an iron alloy sample by pre-oxidation melting, which comprises the following steps of: 1) filling a crucible with high-purity graphite, compacting, and making pits in the high-purity graphite; 2) uniformly mixing an oxidizing agent, a flux and a sample, adding the mixture into the pit, and oxidizing and melting under a high-temperature condition; 3) after melting and cooling, taking out the obtained glass frit; and 4) putting the taken glass frit into a platinum crucible for melting. The method can solve the problem that the platinum crucible is corroded when the glass fuse piece is prepared through high-temperature melting when the X-ray fluorescence spectrophotometer for preparing the glass sheet through melting is used for measuring all elements in the iron alloy.

The invention discloses a nickel-iron alloy precipitation type perovskite catalytic material with excellent ammonia decomposition activity and solid oxide fuel cell performance as well as a preparation method and an application of the nickel-iron alloy precipitation type perovskite catalytic material. The general formula of the catalytic material is La < 0.7 > Sr < 0.2 > Fe < 1-x > Ni < x > O < 3-delta > (0 lt, x is smaller than or equal to 0.3), uniform precipitation of Ni-Fe nano-alloy particles is promoted under a high-temperature condition through B-site nickel doping and A-site defect regulation, ammonia decomposition activity is remarkably improved, and electron-ion mixed conductivity of the material is enhanced. A stable three-dimensional polymer network structure is constructed through batch feeding and a citric acid-sol-gel method, the ammonia decomposition rate of the obtained catalytic material at 600-800 DEG C is close to the equilibrium conversion rate, the power density of a fuel cell is remarkably improved, and the problem that a traditional Ni-based anode is prone to sintering and agglomeration at high temperature is effectively solved. The material is compatible with a plurality of electrolyte systems such as YSZ, GDC and SDC, and is suitable for application scenarios such as a plurality of fuel cell electrodes.

The invention discloses a nickel-iron alloy dissolving method which comprises the following steps: feeding a copper sulfate solution into a mixed feed liquid containing a first nickel-iron alloy and copper sulfate, carrying out primary replacement reaction to obtain copper-containing slag and a reaction liquid, maintaining c (Fe < 2 + >) / c (Cu < 2 + >) in the reaction liquid to be 50-90, and overflowing to obtain a nickel-iron-copper solution; wherein c (Fe < 2 + >) and c (Cu < 2 + >) are mass concentrations of Fe < 2 + > and Cu < 2 + > respectively, and the unit is g / L; and carrying out secondary replacement reaction on the nickel-iron-copper solution and a second nickel-iron alloy until the concentration of Cu < 2 + > in a liquid phase is lower than 5ppm, and carrying out solid-liquid separation to obtain a nickel-iron solution product and second copper-containing slag. According to the dissolving method of the ferro-nickel alloy, the recovery process of ferro-nickel in the ferro-nickel alloy can be simplified, the quality of the ferro-nickel solution is improved, the gas production phenomenon caused by acid dissolution is avoided, and the safety is higher.

The invention discloses an alloyed hot-dip galvanized steel sheet, a substrate of the alloyed hot-dip galvanized steel sheet contains 0-1.0% by mass of Si, the average Fe content in an alloyed hot-dip galvanized layer of the alloyed hot-dip galvanized steel sheet is 7-10% by mass, and the surface phase structure of the alloyed hot-dip galvanized layer contains a columnar zinc-iron alloy phase, the ratio R of the length to the width of the columnar zinc-iron alloy phase is greater than or equal to 2 and less than or equal to Rlt; 7. The pulverization grade of the alloyed hot-dip galvanized steel plate is smaller than or equal to 6 grade, and the pulverization resistance is good. The invention further discloses a manufacturing method of the alloyed hot-dip galvanized steel plate, the manufacturing method is suitable for the low-silicon steel plate, and the alloy phase structure of a steel plate coating is controlled by controlling the air-fuel ratio in the preheating stage in the continuous annealing step, the dew point DP in the soaking stage and the alloying temperature in the alloying step, so that the pulverization resistance of the steel plate is improved.

The invention provides a method for separating nickel and iron through nickel-iron alloy fused salt chloridizing roasting and application. The method comprises the following steps that mixed salt is fused to obtain mixed fused salt, and the mixed salt comprises FeCl2, FeCl3, NiCl2 and CaCl2; the ferro-nickel alloy is immersed in the mixed molten salt, chlorine is introduced, chloridizing roasting is carried out, and a volatile gas phase is obtained; wherein the reaction temperature ranges from 650 DEG C to 900 DEG C, and the reaction time ranges from 60 min to 200 min; and carrying out first condensation on the volatile gas phase to obtain a ferric trichloride product. According to the method for separating nickel and iron through chloridizing roasting of the nickel-iron alloy molten salt, the appropriate compound is selected and molten to obtain the mixed molten salt, so that the melting point of the mixed molten salt is low. Wherein due to the existence of FeCl2, FeCl3 and NiCl2, the effects of strengthening the chlorination process and improving selective chlorination can be achieved, and therefore the utilization rate of chlorine is increased.

The invention relates to a preparation method of a weather-resistant steel plate for a rare earth La photovoltaic support, and belongs to the technical field of weather-resistant steel. The problem that traditional weathering resistant steel lacks price advantage in market competition with hot-dip galvanized steel due to high alloy content and high initial cost is solved. According to the invention, chemical component design is optimized, a rare earth element La is introduced, a Cu-La-Cr ternary corrosion-resistant system is constructed, meanwhile, specific smelting, refining, continuous casting and hot continuous rolling processes are adopted, and key parameters of each step are strictly controlled; according to the method, the economical efficiency and the high performance of the steel for the photovoltaic support are both considered through pre-desulfurization treatment, adding components, adding time and adding amount of the lanthanum-iron alloy, the temperature system of hot continuous rolling, the controlled cooling process and the like. The preparation method has the characteristics of being low in cost, simple in process and high in operability, and the weather resistance and the mechanical property of the steel plate are not reduced while the alloy cost can be remarkably reduced, so that the requirements of low cost, high corrosion resistance and high strength of weather-resistant steel in the photovoltaic field of C1 and C2 low-corrosion areas in the northwest are met.

The present invention discloses a method for separating nickel and iron from a nickel-iron alloy by chlorination roasting: (1) placing the nickel-iron alloy in a roasting furnace; (2) introducing a gaseous chlorinating agent into the roasting furnace for staged roasting to obtain roasting slag and a roasting gas phase; wherein the gaseous chlorinating agent is a mixture of chlorine and gaseous ferric chloride; and (3) condensing the roasting gas phase obtained in step (2) in stages to obtain solid ferric chloride and liquid silicon tetrachloride, respectively. The present invention controls the composition of the chlorinating agent during the chlorination roasting process to achieve selective and directional volatilization of iron into the gas phase while preventing nickel from being chlorinated. Thus, nickel and iron in the nickel-iron alloy can be separated in a single step, and the process flow is short.

The invention relates to the technical field of wastewater treatment and resource recovery, and discloses an organophosphorus degradation and recovery system based on double-cathode electro-Fenton reaction, comprising: an electrolytic tank for accommodating organophosphorus wastewater to be treated; the anode is arranged in the electrolytic tank and is electrically connected with an anode of a power supply; the oxidizing agent generating cathode is arranged in the electrolytic tank and is used for generating hydrogen peroxide in situ under a power-on condition; the metal reduction cathode is arranged in the electrolytic tank and is used for adsorbing and reducing ferric ions; the metal source is composed of zero-valent iron or iron alloy, is not directly and electrically connected with the power source, and is arranged in an electric field acting area established by the anode and the at least one cathode. Through the design of inductive slow-release iron supply and double-cathode collaborative circulation, a series of problems of uncontrollable iron ion release, high iron sludge yield, low catalyst utilization efficiency, difficulty in resource recovery and the like in the traditional electro-Fenton technology are effectively solved.

The invention relates to the technical field of copper-iron alloys, and discloses a preparation method of a high-strength, high-conductivity and high-temperature-resistant powder metallurgy copper-iron alloy, which comprises the following steps: S1, preparing copper-aluminum alloy powder through an atomization method, and then preparing dispersion-strengthened copper alloy powder through internal oxidation and reduction treatment; s2, mechanical alloying composite powder is prepared through ball milling; s3, the prepared powder is pressed and formed; s4, sintering and densifying the pressed and formed powder; and S5, finally carrying out thermomechanical treatment. The invention aims to provide the high-strength, high-conductivity and high-temperature-resistant powder metallurgy copper-iron alloy which is uniform and fine in iron phase distribution, fine in crystal grain, excellent in high-temperature performance and good in processability, so as to solve the problems that the copper-iron alloy prepared by the traditional casting method is segregated in component, coarse in crystal grain, poor in high-temperature performance and processability, low in cost and the like. And the problem of poor high-temperature performance caused by growth and coarsening of the initial iron particles and the deformed iron fibers at high temperature is solved, and the method has important application prospects under the high-temperature service condition in the fields of electricity and rail transit.

The invention belongs to the field of mineral smelting, and particularly relates to a selective carbonization roasting and niobium / titanium separation method for niobium-titanium-iron paragenic ore, which comprises the following steps of: carbonizing the niobium-titanium-iron paragenic ore and a carbon material in a weight ratio of 100: (2-10) in activated gas at the temperature T, niobium in the niobium-titanium-iron paragenic ore is selectively converted into niobium carbide, a niobium-iron alloy is formed, then the carbonized product is subjected to magnetic separation treatment, and a niobium-iron alloy magnetic separation material containing niobium carbide and titanium-enriched magnetic separation tailings are obtained; the activation gas is a hydrogen-containing gas; and the temperature T is 1000 to 1300 DEG C. By means of the method, selective carbonization of niobium in the mineral can be achieved, and selective separation of niobium and titanium can be achieved.

The invention provides a separation and recovery method of a nickel-iron alloy. The separation and recovery method comprises the following steps that S1, the ferro-nickel alloy material is subjected to atmospheric pressure leaching, and leaching residues and leaching liquid are obtained; s2, mixing the leachate in the S1, phosphoric acid and a first pH regulator, regulating the pH value to 1.6-1.8, and carrying out first impurity removal treatment to obtain iron phosphate and an impurity-removed solution; and S3, adjusting the pH value of the liquid subjected to impurity removal by adopting a second pH regulator until the pH value is 2.1-2.3, and carrying out second impurity removal treatment to obtain precipitation slag and a nickel-containing solution. According to the method, under the condition that impurities in the leachate are removed through phosphoric acid, the pH value of the leachate is adjusted and controlled in two stages, so that few main metal is included in impurity precipitates, the filtering performance is good, meanwhile, the loss of the main metal in the impurity removal process is reduced, and the recovery rate of nickel in the nickel-iron alloy material is increased.

The invention discloses a low-cost method for purifying and modifying steel rail inclusions and improving comprehensive mechanical properties of the steel rail inclusions, and the method comprises the following steps: adding a rare earth iron alloy containing 30% of rare earth into molten steel in VD (vacuum degassing), and determining O in the steel before adding, the O is required to be less than or equal to 10ppm, so that the prepared molten steel for continuous casting comprises the following chemical components in percentage by mass: 0.78-0.85% of C; 0.50% to 0.60% of Si; 1.10% to 1.30% of Mn; less than or equal to 0.020% of P; s < = 0.008%; 0.20% to 0.30% of Cr, 0.003% to 0.008% of RE iron alloy or 0.0010% to 0.0024% of RE; and the balance of Fe and inevitable impurities. According to the method, A-D type inclusions in the steel can be obviously reduced, the purification effect and the modification effect of rare earth on the steel inclusions are fully achieved, and the service life of the steel rail is prolonged.

The invention relates to the technical field of continuous casting, and discloses an improved aluminum-iron alloy continuous casting machine which comprises a support, a mounting seat is fixedly mounted on the outer side of the support, a supporting frame is fixedly mounted on the outer side of the mounting seat, and a chain conveying device is arranged on the outer side of the supporting frame. The chain transmission device is the existing equipment in the prior art, so that the chain transmission device is drawn but not labeled in a picture, and is not described in details. According to the improved aluminum-iron alloy continuous casting machine, in order to improve the stability of an alloy material, the conveying assembly is arranged and matched with the chain conveying device to convey a connecting block connected with a long-hair-strip spring and a receiving plate through a thin rod, and meanwhile when the connecting block is conveyed to the end of the chain conveying device, the receiving plate is made to move downwards and make contact with an impact rod; and meanwhile, the receiving plate is conveyed in a circulating mode in cooperation with a chain conveying device, and therefore the receiving plate can be automatically reset in cooperation with a long-hair-strip spring.