701 results about "Ferroalloy" patented technology

Systems and methods described herein may include pumps and pump components including carbon-manganese-chromium (C—Mn—Cr)-based steel alloys for enhanced resistance to wear or corrosion. A pump component may include one or more components formed of a C—Mn—Cr-based ferrous alloy, which may result in enhanced wear or corrosion resistance. The C—Mn—Cr-based ferrous alloy may include a carbon content ranging from about 0.1 weight percent (wt. %) to about 2 wt. %, a manganese content ranging from about 10 wt. % to about 30 wt. %, and a chromium content ranging from about 0.1 wt. % to about 20 wt. %.

The invention belongs to the technical field of metallurgical engineering, and discloses a red mud and arsenic-containing hazardous waste collaborative resource utilization method which comprises the following steps: pretreating red mud by adopting roasting and magnetic separation processes, mixing the pretreated red mud with sodium carbonate, a reducing agent and non-ferrous smelting arsenic removal slag, and carrying out reduction smelting to obtain arsenic-iron alloy and sodium carbonate slag; the arsenic-iron alloy can be used as a counterweight material; the furnace slag can be reused as an arsenic removal agent. According to the method, the red mud is pretreated through roasting and magnetic separation, the valuable element iron is enriched from the red mud in a high-selectivity mode and cooperates with the colored arsenic-removed slag to carry out reduction smelting, the harmful element arsenic is converted into a novel material, synergistic resource utilization of the red mud and the arsenic-containing hazardous waste is achieved by using waste to treat waste, and the method has great significance.

The invention relates to a multi-electrode direct-current electric arc furnace, a submerged arc furnace power supply device and a smelting method, belongs to the technical field of industrial smelting, and aims to solve the problem of working condition of abnormal conductivity of furnace charge of the multi-electrode direct-current furnace. The device is composed of a phase-shifting transformer, a rectification module, a direct current conversion module, an isolation switch and other components, and all the components are connected according to a specific rule, so that a top electrode attribute conversion loop is formed in the device topology. By matching with the smelting method, cathode and anode attribute transformation of the multi-electrode direct current furnace top electrode can be realized, smelting can be performed through a top electrode loop under complex conditions of poor furnace charge conductivity and the like, and a normal production process can be recovered after a molten pool in the furnace appears and the furnace charge conductivity is enhanced, so that the abnormal fault processing time is shortened, and the production efficiency is improved. And the smelting efficiency of industrial smelting, especially in the fields of iron alloys and special steel, is improved.

A laminated core comprising a plurality of segments is provided. The segments each comprise a plurality of soft magnetic lamination sheets that are stacked one on top of another in a direction of stacking and attached to one another by means of a first connection type to form a segment. The segments are attached by means of a second connection type to form a laminated core, the first and second connection types being different.

The present invention provides a method for hydrogen-based reduction roasting pretreatment of chromite pellets, belonging to the field of metallurgical technology. The method comprises the following steps: mixing chromite powder, a binder and water to form pellets, obtaining green chromite pellets; mixing H2 and CO to obtain a reducing gas; and carrying out reduction roasting on the green chromite pellets in the reducing gas. The reduction roasting of the present invention is carried out in an H2-CO atmosphere, completely without involving the use of primary energy solid carbon, and enables the chromite pellets to obtain sufficient strength and metal pre-reduction degree before entering the ore thermal furnace, which can greatly reduce the comprehensive energy consumption and emissions in the production of ferrochrome alloy.

The invention discloses a method for melting and smelting ferrochrome in an all-oxygen hydrogen-rich low-carbon furnace, which comprises the following steps: (1) proportioning and uniformly mixing chromite pellets, coke and lime according to the mass ratio of 1: (0.15-0.2): (0.08-0.15), and filling the mixture into the all-oxygen hydrogen-rich low-carbon furnace; (2) high-temperature hydrogen-rich gas at the temperature of 900-1100 DEG C is introduced into the middle of the furnace body, and selective reduction of ferrochrome oxide is achieved; blowing industrial pure oxygen at the lower part of the furnace body, combusting with coke to generate CO, and driving a secondary reduction reaction; (3) maintaining a high-temperature environment in the furnace through oxygen-fuel combustion to completely melt the materials into molten iron, and carrying out central stirring on the molten iron to form a vortex with the height-diameter ratio of 0.5-1.5; and (4) discharging the molten iron after the reaction is completed. According to the method, the reduction rate of chromium in the chromite exceeds 92%, the carbon emission is reduced by 40% or above compared with a traditional blast furnace and submerged arc furnace process, meanwhile, the method has the advantages of being high in smelting efficiency, low in energy consumption, stable in product quality and the like, and a low-carbon and efficient innovative path is provided for ferrochrome smelting.

The invention provides a lithium manganese iron phosphate positive electrode material and a preparation method and application thereof. The method comprises the following steps: mixing manganese metal and iron metal, heating, melting and uniformly mixing in an inert gas atmosphere, and grinding into powder; adding an ammonium salt solution, continuously adding the ground manganese-iron alloy powder under heating to form a suspension, introducing compressed air and stirring, reacting, filtering, washing, drying, crushing and grinding to obtain a manganese-iron oxide precursor, feeding the manganese-iron oxide precursor, a lithium source, a phosphorus source and doped metal elements into pure water, adding a carbon source, mixing to form a suspension, and grinding and drying to obtain the lithium-phosphorus-doped manganese-iron composite material. And carrying out carbon thermal reduction in an inert gas atmosphere, and crushing to obtain the lithium manganese iron phosphate positive electrode material. The ferromanganese oxide precursor prepared by heating the metal manganese and the metal iron to a molten state and mixing the metal manganese and the metal iron realizes uniform dispersion of the manganese and the iron at an atomic level, avoids the problems of nonuniform mixing of the manganese and the iron and dissolution of the manganese, and improves the conductivity and the electrochemical performance of the material.

The invention relates to a method for improving early-stage performance of an all-solid-waste cementing material, and aims to improve the early-stage performance of the cementing material. At present, the early strength (1d strength) of an all-solid waste cementing material is generally low, but the characteristic is closely related to construction efficiency and is a key limit for large-scale application of the all-solid waste cementing material. Sintering is not included in the working procedures, and the product does not contain cement clinker. The method comprises the following steps: selecting industrial solid wastes such as steel slag, blast furnace water slag, iron alloy slag, silicomanganese slag, industrial byproduct gypsum, sintering fly ash, fly ash, calcined coal gangue and the like as raw materials; the industrial solid waste is subjected to independent or mixed grinding treatment; by optimizing the raw material ratio and introducing key component minerals, the specific surface area of the cementing material is increased, and active sites of the key minerals are dissociated and exposed. The mass of the introduced key components for optimizing the raw material ratio accounts for less than or equal to 15% of the total mass of the cementing material, the mass fraction of the key and active minerals is increased by less than or equal to 10%, and the early strength of the all-solid waste cementing material is increased by 30%.

The embodiment of the invention relates to a method for recovering ferro-molybdenum through co-smelting of waste silicon-molybdenum rods and copper slag, and the method comprises the following steps: mixing the copper slag, the silicon-molybdenum rods, coke and calcium oxide to obtain a mixture; the mixture is heated, so that the copper slag and the coke are subjected to a smelting reduction reaction to obtain metal iron, molybdenum disilicide in the silicon molybdenum rod is subjected to a pyrolytic reaction under the action of the metal iron and calcium oxide, molten metal and molten slag are obtained, and the molten metal contains ferromolybdenum alloy components; according to the method, the molybdenum element in the waste silicon molybdenum rod can be fully enriched into iron, the recovery rate is high, the process is efficient and environmentally friendly, and waste liquid is not generated.

The invention discloses an antibacterial stainless steel band with high surface quality and a preparation method thereof, and relates to the technical field of antibacterial stainless steel bands, and the preparation method comprises the following steps: smelting an iron alloy raw material, introducing argon into a steel ladle after tapping, stirring molten steel, uniformly mixing, and continuously casting the molten steel into a blank; the casting blank is sequentially subjected to cogging, hot rolling, cold rolling, annealing, solid solution treatment and aging treatment, and a stainless steel band base material is obtained; the method comprises the following steps: by taking a stainless steel band as a working electrode, a platinum plate as a counter electrode and a saturated calomel electrode as a reference electrode, carrying out silver nanoparticle deposition in an aqueous electrolyte through a three-electrode deposition system, taking out and drying to obtain an electro-deposition modified stainless steel band; and the electrodeposition modified stainless steel band is soaked in a dopamine-octadecylamine mixed solution, heating reaction is conducted, ultrasonic washing is conducted through ethyl alcohol, room-temperature drying is conducted, then the electrodeposition modified stainless steel band is soaked in a chitosan coupling heterojunction solution, room-temperature maintaining, deionized water washing and vacuum drying are conducted, and the antibacterial stainless steel band is obtained.

The invention relates to the technical field of ferroboron alloys, in particular to a preparation process of a high-purity ferroboron alloy, which comprises the following steps: S1, preparing raw materials; s2, electric furnace smelting; s3, chemical refining; s4, adjusting components; s5, casting and cooling; and S6, heat treatment. And heat treatment equipment in the step S6 comprises a heating box, a placing mechanism, a path unit, a driving unit and an intermittent unit. The clamped cast ingots intermittently move along a set path through the driving unit, so that the inner cast ingots can move to the outer side to be close to a heat source, each cast ingot can be uniformly heated, then, the cast ingots deflect by a certain angle through the intermittent unit, and after the cast ingots move out of the vertical section of the path, the cast ingots are separated from the heat source. The clamped area of the cast ingot in the initial state is exposed, in conclusion, the area, facing a heat source, of the cast ingot and the distance between the cast ingot and the heat source are intermittently changed, the heating effect in the heat treatment process of the cast ingot is improved, and the problems of excessive heating and insufficient heating are avoided.

The invention relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method of the high-temperature-resistant flux-cored wire. The high-temperature-resistant flux-cored wire containing the rare earth elements comprises a welding wire skin and a flux core. The flux core comprises the following raw materials of dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, ferro-aluminum, potassium cryolite, potassium titanate, sodium titanate, fine iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, nitrided ferrochrome, bismuth oxide, auxiliaries and the balance reduced iron powder. The auxiliary agent is a mixture of a zirconium-iron alloy, a titanium-iron alloy and an aluminum-magnesium alloy. A specific alloy auxiliary is introduced into the flux core to protect stable transition of rare earth yttrium, yttrium and multiple components synergistically optimize the weld joint performance, 253MA heat-resistant steel is matched, slag and electric arc regulation and control components and a reasonable process are matched, and the welding quality of the welding wire is improved.

The invention provides a high-wear-resistance and low-dilution gas shielded welding wire and a preparation method thereof, and belongs to the technical field of welding wire manufacturing. The welding wire consists of the following raw materials in parts by weight: 45-52 parts of iron; 18-22 parts by weight of an electrolytic nickel plate; 6-8 parts by weight of high-purity molybdenum powder; 4-6 parts by weight of nano tungsten powder; 3-4.5 parts by weight of a vanadium nitride alloy; 1.2 to 1.8 parts by weight of a niobium-iron alloy; 0.8-1.5 parts by weight of aluminum magnesium alloy powder; 0.3 to 0.6 part by weight of lanthanum cerium mixed rare earth; 0.15 to 0.25 part by weight of ferroboron alloy; 0.5 to 0.8 part by weight of metal silicon powder; 0.2 to 0.4 part by weight of a magnesium-calcium alloy; and 0.1-0.3 part by weight of titanium hydride powder. The hard framework is formed through gradient distribution of carbides such as molybdenum, tungsten and vanadium, the wear-resisting life is remarkably prolonged, melting mixing of base metal is reduced through the nickel-based alloy, the consistency of deposited metal components is ensured, free hydrogen is fixed through hydrogen trap phases such as titanium and niobium, and a moisture absorption path is blocked in combination with a surface passivation film.

The invention discloses reverse osmosis membrane drying equipment, and relates to the technical field of drying equipment, the reverse osmosis membrane drying equipment comprises a drying treatment frame body, auxiliary drying mechanisms are arranged on the inner surface and the outer surface of the drying treatment frame body, and efficient drying mechanisms are arranged on the inner wall and the right side of the drying treatment frame body; the auxiliary drying mechanism comprises a movable sealing unit, a film body positioning unit and a film body shaking unit, and the efficient drying mechanism comprises a uniform drainage unit and a gas pretreatment unit. Through the design of the electromagnet, the electromagnet can be electrified to generate magnetic force, the magnetic force can adsorb the iron alloy sheet to promote the movable clamping rod to move upwards as a whole, and through the design of the first elastic piece, the movable clamping rod can move upwards through the reset elastic force of the first elastic piece after the electromagnet is powered off. The movable clamping rod is driven to move downwards to be matched with the fixed clamping rod to complete clamping and fixing treatment on the reverse osmosis membrane, the clamping and fixing area is small, and the problem that the clamping position of the reverse osmosis membrane is extremely prone to incomplete drying is solved.

The invention belongs to the technical field of cold forging steel manufacturing, and particularly discloses a production method of high-aluminum cold forging steel for medium-strength and high-strength standard parts, which comprises the following steps: controlling the slag alkalinity, the contents of C, S and P in molten steel, the tapping temperature, the thickness of a steel ladle slag layer and the tapping time during converter smelting; a deoxidizing agent, lime, low-carbon ferromanganese, silicon-manganese alloy, aluminum-iron alloy and a carburant are added, argon is blown into molten steel when calcium-iron wires are fed in an argon blowing station, components of a refining slag modifier are controlled to be added during LF refining, calcium carbide and the aluminum-iron alloy are added according to the oxygen content and the aluminum content in the molten steel, a tundish for continuous casting is protected by argon, and the molten steel is continuously cast. The thickness of a powder slag layer and the thickness of a liquid slag layer are controlled, a covering agent is added into the tundish, the purity of molten steel is increased by adjusting the whole process section, and therefore follow-up tundish nozzle nodulation is reduced, and the problem that in the prior art, due to the fact that the purity of molten steel is low, a high-aluminum cold heading steel casting continuous casting tundish nozzle is prone to nodulation is solved.

The invention discloses a method for preparing metallic iron or iron alloy through microwave activation-molten salt electrolysis, which comprises the following steps: (1) carrying out compression molding on iron ore powder or alloy ore powder to obtain an ore powder rod; (2) the mineral powder rod is placed in microwaves for irradiation activation; (3) wrapping the irradiated and activated mineral powder rod with a stainless steel mesh, and performing a molten salt electrolysis reaction in a molten salt electrolyte system with a protective atmosphere as a cathode; and (4) after the electrolytic reaction is finished, cooling the electrolytic system to obtain the metallic iron or the iron alloy. According to the method, through microwave pre-radiation activation, the raw mineral materials generate a series of microwave effects such as electric, thermal, magnetic and chemical effects, the reaction activity of subsequent molten salt electrolysis of the raw mineral materials is improved, and energy needed by molten salt electrolysis is reduced through the generated thermal effect; the method has the advantages of simple process, small environmental pollution, low energy consumption and the like, and solves the problems of long process flow, high cost and the like of the existing metal iron and iron alloy material preparation.

The invention discloses high-tungsten steel and a preparation method thereof. The method comprises the steps that converter molten steel with the tapping temperature ranging from 1620 DEG C to 1670 DEG C is provided, argon blowing is carried out in the whole process of transferring the converter molten steel from a converter to an LF furnace through a steel ladle for tapping, 40 wt.%-80 wt.% of ferrotungsten alloy is added into the steel ladle in the tapping process, ferrotungsten alloying pretreatment is carried out on the converter molten steel, and first molten steel is obtained; the first molten steel is subjected to LF refining treatment, and 20 wt.%-60 wt.% of ferrotungsten alloy is added into the first molten steel for ferrotungsten alloying treatment; adding a nickel-iron alloy and a molybdenum-iron alloy in at least one process of transferring the converter molten steel from the converter to a steel ladle, transferring the converter molten steel from the steel ladle to an LF furnace and carrying out LF refining treatment on the first molten steel to obtain LF refined molten steel; the LF refined molten steel is subjected to RH vacuum treatment, and RH refined molten steel is obtained; and the RH refined molten steel is subjected to continuous casting, and the high-tungsten steel is obtained. According to the preparation method of the high-tungsten steel, tungsten and iron can be rapidly alloyed, and the tungsten content in the high-tungsten steel can be accurately controlled.

The invention relates to a multi-physics field coupling method for a smelting process of a ferronickel heating furnace, and relates to the multi-physics field coupling method for the ferronickel heating furnace, the method comprises the following steps: establishing a ferronickel heating model, importing the ferronickel heating model into ICEM software for grid division, and finally importing a grid into FLUENT; according to the method, based on a Maxwell's equation and an Ohm's law, an electrothermal conversion algorithm, an electromagnetic induction algorithm and a multiphase heat transfer and mass transfer algorithm are compiled in combination with a user-defined function (UDF), so that a mathematical analysis model for mutual coupling of multiple physical fields, multiphase flows and furnace body thermal stress in smelting of the submerged arc furnace is established. The model is combined with a radiation model, a turbulence model, a multi-phase flow model and a static structure model, a heat and mass transfer mechanism among an electric arc, a molten pool and a furnace body is disclosed, an influence mechanism of a furnace body structure and a multi-physical field on furnace body temperature distribution is explored, and an action mechanism between the furnace body temperature and thermal stress is clarified, so that the deformation position and deformation amount of the furnace body are predicted.

The invention discloses a self-supporting catalytic electrode for hydrogen production from alkaline electrolyzed water and a preparation method of the self-supporting catalytic electrode. The preparation method comprises the steps that an electroplating solution containing nickel salt, ferric salt and ammonium chloride is prepared, then in the electroplating solution, a conductive substrate serves as a cathode, metal nickel serves as an anode, an external power source is used for providing gradually-increased electroplating voltage, and electroplating is carried out in three stages; depositing a nickel-iron alloy conducting layer on the cathode in an electroplating voltage range of 0.5-1.0 V; the electroplating voltage is gradually increased to 1.0-1.4 V, and a transition layer in which the ferro-nickel alloy and LDH coexist continues to be deposited on the cathode; and the electroplating voltage is further increased to 1.4-1.8 V, and the LDH active layer continues to be deposited on the cathode. The conductive supporting layer and the high-activity catalytic layer are continuously deposited on the same substrate through the electroplating technology, integrated combination of conductivity and catalytic performance is achieved, and the defects that in a traditional catalytic electrode, the binding force between an active layer and a supporting body is weak, and stability is poor are overcome.

The invention provides a multivariable control method for the carbon content of a ferrosilicon furnace, and is applied to the technical field of ferrosilicon-manganese alloy smelting. The method comprises the following steps: acquiring multivariable parameters for the carbon addition amount of the silicon iron furnace; the multiple parameters comprise an electrode current, a power factor, an artificial iron control parameter, an electrode pressure release amount, an electrode position, a furnace gas size, a weight of fly ash, hole opening time, a molten iron temperature and a hole opening flow rate; setting a judgment quantity, wherein the judgment quantity has an initial value; for each parameter in the multivariable parameters, adding different numerical values to the judgment quantity according to different conditions of parameter values to obtain a final accumulated value of the judgment quantity; when the accumulated value of the final judgment quantity is larger than a first threshold value, the silicon iron furnace is judged to be high in carbon intensity, and the carbon adding quantity is reduced by a first preset quantity; and when the accumulated value of the final judgment quantity is smaller than a second threshold value, the silicon iron furnace is judged to be carbon-deficient, and the carbon addition quantity is increased by a first preset quantity. According to the method, the carbon addition amount can be adjusted in time, and the purposes of stabilizing the furnace condition, reducing the unit consumption and improving the yield are achieved.

The invention relates to the technical field of metallurgy, in particular to a process method for producing iron alloy through reduction of silver furnace dilution slag, which comprises the following steps of: 1, pretreating raw materials, namely crushing and levigating the silver furnace dilution slag, and crushing and screening a reducing agent; 2, mixing the pretreated raw materials, adding an additive, uniformly mixing, and adding the uniformly mixed mixture into a reduction furnace for reduction smelting; the tailings subjected to beneficiation dilution are selected, the dilution slag in the molten state is directly subjected to electric furnace reduction and is subjected to reduction smelting in the electric furnace, coke powder is adopted as a reducing agent, the dilution slag is added, the reduction rate of iron reaches 97% or above, the reduction rate of copper reaches 95% or above, and the iron content of the obtained alloy is 86% or above; the iron alloy can be sold as pig iron, and the depleted electric furnace slag contains more than 50% of silicon dioxide and can be used as a raw material for producing cement, so that zero emission of the smelting furnace slag, efficient utilization of high-temperature heat energy and low-cost production are realized.

The utility model relates to the technical field of waste heat boilers, in particular to an ash removal device for a waste heat boiler of an iron alloy submerged arc furnace, which comprises a base, a waste heat recovery box, a water inlet pipe, a water outlet pipe, an air inlet pipe, an air outlet pipe and an ash removal mechanism. The water outlet pipe is fixedly connected with the surface of the waste heat recovery box, the air inlet pipe is fixedly connected with the surface of the waste heat recovery box, the air outlet pipe is fixedly connected with the surface of the waste heat recovery box, the ash removal mechanism is arranged on the surface of the air inlet pipe and comprises a fixing table, the fixing table is fixedly connected with the surface of the air inlet pipe, and the surface of the fixing table is rotationally connected with a first fan. According to the waste heat recovery device, the dust removal mechanism is arranged, blowing force generated when hot flue gas enters the waste heat recovery box is used for driving the cleaning plate and the hemispherical block to clean the surface of the heat exchange pipe, dirt and dust on the surface of the heat exchange pipe are prevented from being accumulated, the heat exchange efficiency is prevented from being affected, and the durability of the device is effectively improved.

Herein discussed is a heat management system comprising a pipe and a static auger inside the pipe, wherein the pipe has an inner diameter of d, wherein the auger has an outer diameter D and a pitch P, wherein the ratio of D / P is no less than 1, and wherein the auger outer diameter D is no less than 90% of the pipe inner diameter d. In an embodiment, the ratio of D / P is in the range of 2-10, or 2-5, or 2-4, or 5-10. In an embodiment, the pipe is made from stainless steel, carbon steel, Monel, Inconel, Incoloy, Hastelloy, ceramics, silicon carbide, alumina, and combinations thereof. In an embodiment, the system comprises a fluid passing through the pipe, wherein the pipe heats or cools the fluid.

The invention provides a method and a system for recovering ferrochrome in ferrochrome slag based on particle size separation, and relates to the technical field of metal mineral treatment. The method comprises the following steps: crushing the ferrochrome slag until the particle size is less than or equal to 15mm; the crushed ferrochrome slag is screened into materials with three particle sizes of-15 + 6 mm,-6 + 1 mm and-1 mm; respectively carrying out magnetic separation on the materials of the first particle size fraction and the second particle size fraction to obtain a first magnetic product, a second magnetic product and a non-magnetic product; the materials of the third particle size fraction are ground to the preset fineness, and ground materials are obtained; the ore grinding materials are subjected to gravity separation, and gravity separation products and tailings are obtained; the first magnetic product, the second magnetic product and the reselection product are recycled ferrochrome. Through the combination of crushing, screening, magnetic separation, grinding and reselection processes, high-efficiency recovery of ferrochrome alloy with different particle sizes in ferrochrome slag is realized, the recovery rate of ferrochrome alloy is improved, and good economic benefits and environmental benefits are achieved.

The invention discloses a method and device for establishing an oxidation corrosion model of ferrochrome in a closed environment based on finite elements, and the method comprises the steps: obtaining a first size of a closed gas environment, and obtaining a second size of a sample of a ferrochrome material; establishing a two-dimensional geometric model according to the first size and the second size; the oxidation corrosion reaction information of the ferrochrome material is preset; presetting a first attribute of the ferrochrome alloy material, a second attribute of a reaction substance and a third attribute of a closed gas environment; performing grid division on the ferrochrome material to obtain a target grid division area; and constructing an oxidation corrosion model according to the two-dimensional geometric model, the oxidation corrosion reaction information, the first attribute, the second attribute, the third attribute and the target grid division region. The method can improve the data accuracy of monitoring and predicting the corrosion degree of the alloy, and can be widely applied to the technical field of computers.

The invention discloses a tungsten-based heavy alloy surface-coated stainless steel component and a preparation method and application thereof, and belongs to the technical field of metal connection. The preparation method of the component with the tungsten-based heavy alloy surface coated with the stainless steel comprises the following steps that a transition layer is additionally attached to the surface of tungsten-nickel-iron alloy; the tungsten-nickel-iron alloy with the transition layer and austenitic stainless steel are assembled, and a sheath assembly is obtained; carrying out degassing and hot isostatic pressing treatment on the sheath assembly; according to the preparation method of the component coated with the stainless steel on the surface of the tungsten-based heavy alloy, the tungsten-based heavy alloy and the austenitic stainless steel are used as matrixes, and preparation of the component coated with the tungsten-based heavy alloy through the austenitic stainless steel is achieved through the method of combining hot isostatic pressure diffusion bonding and powder metallurgy. An existing technology that a stainless steel shell is used for protecting tungsten-based heavy alloy and an end socket is closed in an argon tungsten-arc welding mode is replaced, an original assembly gap is removed through metallurgical bonding, and the whole running-down system is more stable in operation and better in corrosion resistance.

The invention relates to the technical field of self-baking electrodes, in particular to an alternating-current variable-frequency self-baking electrode baking state prediction method for an iron alloy submerged arc furnace, which comprises the following steps: acquiring input parameters of a self-baking electrode, and simplifying an electromagnetic field and a heat transfer process related to the self-baking electrode into a two-dimensional axial symmetry state; constructing an electromagnetic field mathematical model, and obtaining expressions of the magnetic field intensity and the current density of the self-baking electrode; constructing a temperature field mathematical model of the self-baking electrode of the submerged arc furnace and an expression of electrode pressure release time; a finite volume method is utilized to discretize an electromagnetic field mathematical model and a temperature field mathematical model, and on the basis of input parameters and electromagnetic thermal boundary conditions, an implicit solution method which is good in convergence and stability and can achieve a large grid size is adopted to solve the magnetic field intensity, the current density, the temperature distribution and the electrode pressure release time of the self-baking electrode. The method can accurately and quickly predict the electrode pressure release time, and effectively reduces the roasting control cost of the self-roasting electrode of the submerged arc furnace.

The invention discloses a clean preparation method of a rare earth ferrosilicon alloy based on cooperative control of carbon addition and silicon supplement, and belongs to the technical field of thermometallurgy. In order to solve the problems that according to an existing carbon thermal reduction method, the furnace bottom is prone to nodulation, the recovery rate is low, and energy consumption is high, the'carbon addition-silicon supplementation-carbon depletion 'ternary cooperative regulation and control method is provided. Comprising the following steps: taking a rare earth-containing material, a siliceous raw material and a carbonaceous reducing agent as raw materials, burdening, pelletizing, and adding into a submerged arc furnace for reduction smelting; the core technology is that the weight ratio of oxide to reducing agent carbon in the rare earth pellets is controlled to be 1: (1.20-1.30), meanwhile, a silicon element accounting for 2.0-10.0% of the weight of the oxide is added, and parameters meet the coupling relational expression S = k * (1.30-R) * 100% + S0; and the smelting adopts carbon deficit operation, and the carbon addition amount is 0.90-0.95 times of the theoretical amount. The method inhibits the generation of the rare earth carbide nodule at the furnace bottom from the aspects of thermodynamics and dynamics, and realizes continuous and stable production. The rare earth recovery rate reaches 96% or above, the comprehensive power consumption is reduced to 8600-9000 kWh / t, the furnace life is prolonged to 25 months or above, and remarkable economic and environmental benefits are achieved.

The invention provides a method for short-process all-component echelon recovery of a waste hydrogenation catalyst, and relates to the field of solid waste treatment. The recovery method of the waste hydrogenation catalyst comprises the following steps: roasting the waste hydrogenation catalyst and sodium carbonate to obtain a roasted product; the roasted product is leached with water, and leaching liquid and leaching residues are obtained; extracting the leaching solution by using an extracting agent to obtain a vanadium-molybdenum-containing organic phase, sequentially carrying out reverse extraction treatment on the vanadium-molybdenum-containing organic phase by using a strong alkaline reverse extraction agent and a weak alkaline reverse extraction agent to obtain a vanadium reverse extraction solution and a molybdenum reverse extraction solution, and carrying out vanadium precipitation treatment on the vanadium reverse extraction solution to obtain ammonium metavanadate; acidizing the molybdenum strip liquor to precipitate molybdenum to obtain ammonium molybdate; carrying out sintering treatment on the leaching residues and alkaline substances, leaching obtained calcine with water to obtain water leaching residues and filtrate, and carrying out aluminum precipitation treatment on the filtrate to obtain aluminum hydroxide, aluminum oxide or pseudo-boehmite; and reducing and smelting the water leaching residues to obtain the ferro-nickel alloy. According to the invention, multi-element comprehensive recovery of all components of vanadium, molybdenum, nickel, aluminum and sulfur can be realized, and high-value utilization of all components of the waste hydrogenation catalyst is realized.

The present invention relates to the field of magnetic material technology, and in particular to a method for preparing isotropic samarium iron nitrogen magnetic powder and isotropic samarium iron nitrogen magnetic powder. A method for preparing isotropic samarium iron nitrogen magnetic powder comprises the following steps: 2 Fe 17 The invention discloses a method for preparing a samarium iron alloy by mixing metal Sm and Fe with an excess of 5% to 10% of Sm, and then melting and rapidly solidifying the metal Sm-Fe alloy flakes; crushing the Sm-Fe alloy flakes to prepare powdered Sm-Fe alloy; subjecting the powdered Sm-Fe alloy to HDDR treatment to obtain an isotropic alloy block; crushing the isotropic alloy block, and subjecting the powdered Sm-Fe alloy to aging treatment to obtain an isotropic alloy powder; subjecting the isotropic alloy powder after aging treatment to high temperature nitriding treatment to obtain Sm 2 Fe 17 N 3 Isotropic magnetic powder. The prepared isotropic samarium iron nitrogen magnetic powder has both high magnetic energy product and coercive force.