41 results about "Ferrotitanium" patented technology

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 relates to the technical field of steel smelting, in particular to a pipeline steel plate for a hydrogen embrittlement-resistant high-pressure pure hydrogen conveying pipeline and a smelting method of the pipeline steel plate. The smelting process comprises the steps of converter smelting, CAS refining, LF refining, RH refining and continuous casting. In LF refining, oxygen is determined after molten steel arrives at a station, silicon iron is added for deoxidation, and the oxygen content of the molten steel is stabilized to be 20-80 ppm; 0.10-0.35 kg of ferrozirconium is added for each ton of steel in the LF refining process, and 0.50-0.80 kg of ferrotitanium is added for each ton of steel after heating is conducted for 5-10 min. Under the equipment condition of a conventional smelting mode, through a special deoxidation mode without adding aluminum, ferrozirconium, ferrotitanium and rare earth alloy materials are added according to a specific process, and the whole process of the smelting process is optimized, so that the purity of molten steel is improved, the morphology of inclusions is improved, absorption and diffusion of hydrogen are inhibited, and a structure refining and hydrogen trap system is stably formed; the prepared pipeline steel plate shows higher hydrogen embrittlement resistance in a high-hydrogen environment, and is particularly suitable for long-term service requirements in high-pressure, variable-load and water-containing hydrogen environments.

The invention provides a process method for producing ferrotitanium powder by reducing ilmenite, which comprises the following steps of: uniformly mixing ilmenite concentrate with a biomass-coal mixed reducing agent, a nanoscale additive and the like, reducing in a rotary kiln under a temperature-controlled and oxygen-controlled atmosphere, quenching and cooling a product by water, and performing multi-stage ore grinding magnetic separation to obtain metal iron particles and a titanium-rich material; and preparing the two into a ferrotitanium powder product. The process integrates innovative units of raw material homogenization pretreatment, biomass-coal mixed reducing agent dynamic proportioning, LIBS + Raman spectrum on-line monitoring closed-loop control, nano CaO-Na2O composite catalyst buffer addition, finished product multistage magnetic separation reforming and the like. The product composition fluctuation is obviously reduced, the TiO2 content fluctuation is controlled within + / -0.4%, the FeO content fluctuation is controlled within + / -0.5%, the metallization ratio is improved to 90% or above, the heat efficiency is improved by about 20%, and the energy consumption per unit yield is reduced by about 15%. The ilmenite is directly, efficiently and cleanly utilized, a high-quality titanium-rich raw material can be provided for production of titanium dioxide, titanium sponge and the like, meanwhile, the byproduct high-grade iron powder is used for steelmaking, and the comprehensive utilization benefit of resources is remarkable.

The invention belongs to the field of metal material modification and roller manufacturing, and particularly relates to a production method of a double-element alloying modified carbide high-chromium cast iron roller for rod and wire rolling. Paving ferrotitanium at the bottom of a ladle, smelting molten iron on the outer layer of the roller by adopting an intermediate frequency furnace, and discharging when the components reach the standard and the temperature of the molten iron reaches 1460 + / -20 DEG C; after the molten iron subjected to titanium alloying treatment is subjected to slagging-off treatment at a tapping station, Ce particles are packaged in a hollow iron sheet pipe, the hollow iron sheet pipe is inserted into the molten iron after the two ends of the hollow iron sheet pipe are closed, and mechanical stirring is conducted for 1-3 minutes; and when the temperature of the molten iron subjected to Ti and Ce double alloying is reduced to 1440-1450 DEG C, the molten iron is poured into a rotating mold at a constant speed for centrifugal pouring. The size and distribution of carbides are modified mainly through double-element alloying, the abrasion resistance of the slitting roller is improved, the protection effect of a matrix on the carbides is enhanced, the toughness of a slitting blade is improved, the tipping occurrence rate is reduced, and therefore the rolling efficiency is improved.

The utility model discloses magnetic separation equipment for ferrotitanium powder production, relates to the technical field of magnetic separation devices, and aims to solve the technical problems that a direct flow channel of the current magnetic separation equipment is low in adsorption efficiency, the separation quality is influenced, materials are easy to remain in the direct flow channel, and the current magnetic separation equipment is inconvenient to clean. A support is fixed to the outer side of the barrel, the base mechanism is installed at an opening in the lower end of the barrel and is composed of a bottom barrel and a drainage pipe, the drainage pipe is installed in the middle of the bottom barrel in a penetrating mode, the storage disc is installed on the inner side of the bottom barrel in a clamped mode, a pipe clamping opening is formed in the middle of the storage disc, and the pipe clamping opening is in butt joint with the drainage pipe. The driving mechanism is installed at the top end of the interior of the barrel and composed of a feeding barrel and a connecting shaft. The utility model has the advantages that the roundabout feeding channel is matched with the magnetic structure for all-directional adsorption separation, the separation quality is ensured, the material residue is avoided, and the cleaning is convenient.

The utility model discloses a ferrotitanium powder raw material feeding lifting device, relates to the technical field of ferrotitanium powder raw material conveying, and aims to solve the technical problems, the ferrotitanium powder raw material feeding lifting device comprises a conveying pipe, a feeding mechanism and a reducing mechanism, the feeding mechanism and the reducing mechanism are arranged on the conveying pipe, a conveying fan is arranged at the initial end of the conveying pipe, and a lifting pipe is arranged at the tail end of the conveying pipe. The reducing mechanism comprises an adjustable reducing pipe and a discharging pipe, the adjustable reducing pipe comprises arc-shaped plates arranged in an array mode, the lower portions of the arc-shaped plates are rotationally connected with the inner wall of the lifting pipe, an electric push rod is arranged on the upper portion of the outer surface of the lifting pipe, and a piston rod of the electric push rod is connected with the upper portions of the arc-shaped plates; and the discharging pipe is arranged at the upper end of the lifting pipe. The ferrotitanium raw material powder conveying device is provided with an adjustable and variable-diameter pipeline structure, and has the advantages that the airflow speed can be effectively increased, the material carrying capacity is enhanced, the problem that ferrotitanium raw material powder slides downwards due to the gravity of the ferrotitanium raw material powder is effectively solved, and it is guaranteed that the materials are conveyed upwards continuously and stably.

This invention relates to the field of steel bar production technology, specifically to a 400MPa grade hot-rolled ribbed steel bar and its preparation method, comprising the following steps: Step 1: Converter steelmaking, controlling the final carbon content to 0.07%-0.09%, and sequentially adding a composite deoxidizer, silicon-manganese alloy, and ferrotitanium to the ladle; Step 2: Continuous casting, using a crystallizer immersion nozzle protection casting process; employing a secondary cooling process; the superheat of the tundish is 10-15℃; Step 3: Heating, with the heating temperature controlled at 1000-1040℃; Step 4: Rolling, with an initial rolling temperature of 1000-1040℃ and a controlled rolling temperature of 900-950℃; Step 5: Cooling, with a controlled cooling temperature of 860-890℃; Step 6: Producing the finished product. This invention improves the titanium recovery rate, reduces smelting costs, and improves the mechanical properties of hot-rolled ribbed steel bars.

The present application belongs to the field of metal material modification and roll manufacturing, and particularly relates to a production method of a double-element alloying modified carbide high-chrome cast iron roll for bar and wire rod rolling. The ferrotitanium is laid on the ladle bottom, a medium-frequency furnace is used to smelt the outer layer molten iron of the roll, and the furnace is discharged when the composition reaches the standard and the molten iron temperature reaches 1460 DEG C + / - 20 DEG C; the molten iron treated by titanium alloying is subjected to slagging treatment at the tapping station, Ce particles are encapsulated in the hollow iron pipe, the both ends are closed and then inserted into the molten iron, and mechanical stirring is carried out for 1-3 minutes; when the molten iron after Ti and Ce double alloying is cooled to 1440-1450 DEG C, the molten iron is poured into the rotating mold at a constant speed for centrifugal casting. The present application mainly modifies the carbide size and distribution through double-element alloying, increases the wear resistance of the cutting roll, enhances the protection of the matrix to the carbide, improves the toughness of the cutting edge, reduces the occurrence rate of edge collapse, and thus improves the rolling efficiency.

The invention relates to the technical field of welding, and discloses an alkaline welding material with high arc stability and high impact absorbing energy and a preparation method thereof. The alkaline welding material comprises a steel core and composite mineral powder, and the composite mineral powder is pressed on the surface of the steel core through a binder. Or the alkaline welding material comprises a low-carbon steel skin and composite mineral powder, and the composite mineral powder is wrapped by the low-carbon steel skin through mechanical rolling; the composite mineral powder comprises, by mass, 30-35 parts of marble, 1.5-10 parts of calcium aluminate, 20-28.5 parts of fluorite, 1-2 parts of synthetic mica, 15-20 parts of iron powder, 5-7 parts of atomized ferrosilicon, 3-5 parts of medium carbon ferromanganese, 4-5 parts of ferrotitanium, 1-2 parts of titanium dioxide and 1-2 parts of sodium carbonate. The obtained alkaline welding material can reduce the melting point of slag, refine grains, improve the cleanliness of molten steel, reduce the fluoride content and ionization energy in the coating, and improve the impact absorbing energy and the arc length of the welding material.

The invention relates to the technical field of manufacturing of metal composite materials, and discloses a corrosion-resistant and wear-resistant bimetal composite cylinder liner which is prepared through the following steps that the inner wall of an outer-layer matrix steel pipe is pretreated and coated with an interface activation flux; raw materials containing waste steel, ferrochrome and the like are molten, ferrotitanium and ferroboron are sequentially added for alloying, then ferric oxide powder and metal yttrium are added for modification treatment, and inner-layer alloy liquid is obtained; the preheated outer-layer matrix steel pipe is placed in a rotating state, and the inner-layer alloy liquid is poured; and after the to-be-solidified pipe fitting is cooled to the room temperature, the pipe fitting is heated to the austenitizing temperature, heat preservation is conducted, and then isothermal quenching treatment is conducted. According to the method, interface oxides are effectively removed and firm metallurgical bonding is promoted by utilizing the interface activation flux; a core is formed through in-situ reaction of metal yttrium and ferric oxide so as to refine grains; and a lower bainite and retained austenite mixed structure is obtained through isothermal quenching, the comprehensive mechanical property of the cylinder sleeve is improved, and the service life of the cylinder sleeve is prolonged.

The invention relates to the technical field of welding materials, and particularly discloses a flux-cored wire special for roller repairing for a welding robot and a preparation method of the flux-cored wire. A roller repairing flux-cored wire special for a welding robot comprises an outer skin and flux core powder, and the flux core powder is prepared from, by mass, 14%-18% of rutile powder, 2%-5% of zircon sand, 6%-9% of dehydrated potassium feldspar, 3%-6% of fluoride, 4%-8% of potassium compounds or / and sodium compounds, 18%-25% of chromium powder, 3%-6% of molybdenum powder, 5%-8% of electrolytic manganese, 2%-4% of silicon iron, 1%-3% of ferrotitanium, 3%-5% of carbon black, 0.1%-0.6% of bismuth oxide and the balance iron powder. The flux-cored wire prepared in the invention shows excellent working stability in welding, and an obtained surfacing layer has high hardness, good low-temperature impact toughness and excellent wear resistance, and is intact in internal quality.

The invention provides a 90kg-grade ultralow-temperature high-strength steel welding rod and a preparation method thereof, and the welding rod comprises a core wire and a coating covering the surface of the core wire, the coating is prepared from, by weight, 35%-45% of marble, 15%-20% of fluorite, 3%-5% of silica powder, 2%-4% of rutile, 1%-2% of manganese metal, 1%-2% of ferrosilicon, 15%-20% of nickel metal, 5%-10% of ferrotitanium, 2%-5% of ferromolybdenum, 0.4%-0.8% of sodium alginate, 0.3%-0.9% of sodium carbonate, 0.2%-0.5% of lanthanum oxide and the balance iron powder. According to the welding rod, under the high channel temperature welding condition, the mechanical property of deposited metal can obtain high tensile strength in the welding state and the heat treatment state, and good low-temperature toughness is achieved.

The invention discloses a smelting method of weathering resistant steel SPA-H molten steel, and mainly solves the technical problems that the existing weathering resistant steel SPA-H molten steel is poor in castability, inclusions are difficult to control during smelting by using an argon blowing straight-up process, and the production cost is high. According to the technical scheme, the smelting method of the weathering resistant steel SPA-H molten steel comprises the following steps: (1) desulfurizing molten iron; (2) smelting by adopting a top-bottom combined blowing converter, and adding an alloy required by alloying of a copper element into the converter along with the scrap steel; 3) converter smelting process control; 4) converter smelting end point control; 5) converter tapping control; (6) refining in a molten steel argon blowing station to adjust the temperature of the molten steel to 1580-1595 DEG C; aluminum wires are fed into the molten steel; weak stirring is conducted on the molten steel fed with the aluminum wire, and the molten steel is slightly stirred for 5-6 minutes; and then adding a titanium-iron alloy, and continuing to slightly stir the molten steel for 2-3 minutes to obtain finished molten steel. The molten steel produced by the method is directly conveyed to a continuous casting machine for casting, and the number of continuous casting furnaces is larger than or equal to 12.

The invention provides a rotary kiln temperature control and kiln lining heat conduction prediction method for a redox ferrotitanium production plant. The method comprises the following steps that a biomass auxiliary fuel injection device is introduced; the dynamic proportion control of the biomass and the coal is realized based on the dynamic proportion control system of the biomass and the coal; fusing into a kiln lining heat conduction prediction model; all the subsystems act synergistically, so that the kiln lining stress is kept controlled while the kiln drying process is accelerated. The method has the beneficial effects that firstly, biomass auxiliary fuel injection is introduced, and biomass auxiliary combustion can improve the heat utilization rate under the condition that the heating rate is guaranteed; and secondly, the dynamic proportion control of biomass and coal is realized, the supply proportion of the two fuels is adjusted in real time through an intelligent algorithm, and the defect of unstable combustion or temperature control deviation possibly caused by the traditional fixed proportion is overcome. And thirdly, a CFD-based kiln lining heat conduction and humidity prediction model is integrated. After kiln drying is completed, the surface of the kiln lining is intact and free of cracks, and the service life of the kiln lining is remarkably prolonged.

The invention belongs to the field of refractory materials. The invention provides a novel Al2O3-MgO-TiFe composite refractory material which comprises the following raw materials in percentage by weight: 50-75% of Al2O3, 30-50% of MgO, 5-15% of ferrotitanium and phenolic resin which accounts for 2-6% of the total weight of the raw materials and is used as a binding agent. The preparation method comprises the following steps: uniformly mixing the raw materials with a binding agent, carrying out compression molding, drying to obtain an Al2O3-MgO-TiFe composite blank, and sintering the Al2O3-MgO-TiFe composite blank in an air atmosphere at the temperature of 1100-1600 DEG C; the designed Al2O3-MgO-TiFe series new material can react under the oxidizing atmosphere to generate a multi-component compound, Ti and Fe react with Al2O3 and MgO through in-situ oxidation under the oxidizing atmosphere to generate a compound of a MgO-Al2O3-TiO2 and Al2O3-MgO-FeO system, metal directly participates in the reaction, the oxygen partial pressure of the system can be regulated and controlled, and stable existence of ferrous ions is ensured. The series of compounds have good calcium ion corrosion resistance and anti-stripping performance.

The utility model discloses a dust removal device for ferrotitanium alloy production, and belongs to the technical field of gas filtering devices. A dust removal device for ferrotitanium alloy production comprises a dust removal tank, and further comprises multiple groups of filter screens arranged in the dust removal tank at equal intervals, and filter apertures of the filter screens are sequentially decreased from bottom to top, and the filter screens are used for filtering smoke dust generated in the ferrotitanium alloy production process layer by layer; the cleaning assembly is arranged in the dust removal tank and is used for cleaning the filtering end of the filter screen; according to the utility model, through the bristles capable of continuously reciprocating in the rotating process, the filtering end of the filter screen can be automatically and effectively cleaned in the shutdown period, the situation that dust and impurities remain at the bottom of the filter screen is avoided, and dust generated in ferrotitanium alloy production can be effectively filtered in the subsequent production process.

The utility model discloses a hydrogen storage type ferrotitanium alloy material processing device which comprises a supporting box, a conveying roller is arranged above the inner side of the supporting box, a processing box is arranged above the supporting box, a laser cutting machine is arranged at the top of the processing box, and a feeding port and a discharging port are formed in the front side and the rear side of the processing box respectively. A feeding port is formed in the supporting box, a partition plate is arranged on the inner side of the feeding port, a drawing groove is formed in the supporting box in a sliding mode, a dust collection assembly is arranged on one side of the outer portion of the supporting box, a baffle is rotationally arranged on the rear portion of the interior of the supporting box, and limiting plates are arranged on the left side and the right side of the interior of the supporting box in a sliding mode. According to the titanium-iron alloy plate cutting device, the dust collecting device is arranged, so that machining dust is absorbed, the situation that workers inhale the dust is effectively reduced, cutting chippings fall off through the conveying rollers and are collected through the drawing groove, the workers do not need to manually treat the chippings, and machining of a next titanium-iron alloy plate is conveniently and rapidly conducted.

The invention provides a low-splashing flux-cored wire for carbon dioxide arc welding and a preparation method of the low-splashing flux-cored wire. Comprising an outer skin and a flux core filled in the outer skin. The outer skin is prepared from a cold-rolled low-carbon steel strip, a composite metal oxide coating formed through flame spraying is attached to the inner surface of the cold-rolled low-carbon steel strip, the coating is composed of SrO, CeO2, Gd2O3, Bi2O3 and Y2O3, the molar ratio of the SrO to the CeO2 to the Gd2O3 to the Bi2O3 to the Y2O3 is (6.0-7.0): (2.0-3.0): (0.3-0.7): (0.3-0.7): (0.1-0.2), and the coating is of a double-layer porous structure formed by a pore forming agent. The flux core comprises ferrotitanium alloy powder, aluminum magnesium alloy powder, a fluorite and rutile mixed slag former, tin powder and antimony powder. According to the welding wire, source arc stabilization and catalytic inhibition of CO2 decomposition are achieved through the composite coating, the deep deoxidation and slagging functions of the flux core are combined, the welding spatter rate is reduced by 37% or above compared with a conventional welding wire, and the mechanical property of weld metal is excellent.

The application provides a low-carbon high-manganese flux-cored wire and a preparation method thereof, and relates to the field of welding materials.The low-carbon high-manganese flux-cored wire comprises a steel belt sheath and a core material, the core material is filled in the steel belt sheath, and the core material comprises the following raw materials in terms of mass percentage: 36-45% of rutile, 2-4% of ferrotitanium, 4-6% of aluminum powder, 5-7% of manganese-silicon alloy, 6-8% of vanadium iron, 1-3% of nickel powder, 3-5% of molybdenum powder, 2-4% of sodium fluoride powder, 0.5-1% of rare earth ferrosilicon, 0.5-1% of high-boron iron, 2-3% of graphite, and the balance of atomized iron powder.The low-carbon high-manganese flux-cored wire and the preparation method thereof have the advantages that the flux-cored wire deposited metal has similar composition to that of 20Mn23Al, good weldability and excellent crack resistance, the matching of various elements in the flux-cored wire deposited metal also reduces the magnetic permeability, and the flux-cored wire is very suitable for the welding of 20Mn23Al structure, and has the advantages of low cost and long service life.

The invention provides an oxide metallurgy control method suitable for a steel plate for high heat input welding, which comprises the following procedures for producing a continuous casting slab for an EH420 ship plate: KR molten iron pre-desulfurization, converter smelting, LF refining, RH vacuum treatment and slab continuous casting, in the LF refining procedure, aluminum particles of 0.2-0.3 kg / t of molten steel and CaC2 of 0.15-0.25 kg / t of molten steel are fed from a stock bin to deoxidize furnace top slag, when the oxygen content of the molten steel is within the range of 30-40 ppm, a titanium-iron wire is fed into the molten steel for the first time of deoxidation, the titanium-iron wire is fed according to Ti target value calculation, and TiOx high-melting-point fine inclusions are formed. The size (0.5-3 [mu] m) and the number (800-1200 / mm < 2 >) of inclusions in finished steel are in a reasonable range, and the E420 ship plate produced by the method can meet the requirement that the impact absorption energy of a heat affected zone at the temperature of-40 DEG C is greater than or equal to 100J during 300kJ / cm linear energy welding.

This invention belongs to the field of welding materials technology, specifically providing a single-sided welding double-sided forming backing flux, comprising the following raw material components by mass percentage: fused magnesia: 20-40%; quartz: 25-35%; zircon sand: 8-18%; fluorite: 5-15%; ferrosilicon: 3-10%; ferrotitanium: 3-10%; ferroboron: 1-2%; α-alumina: 1-5%; manganese oxide: 1-5%; strontium oxide: 0.5-1.5%; yttrium oxide: 0.5-1%; iron powder: 3-10%; phenolic resin: 2-10%. This backing flux is suitable for double-wire or triple-wire single-sided welding double-sided forming processes, and can meet the welding requirements of 10-35mm large ship panel DH36, EH36, DH40, EH40, etc. It is suitable for high heat input and high efficiency welding, with uniform and stable weld formation, no porosity or indentation, automatic slag removal, and excellent crack resistance.

The invention discloses a wear-resistant flux-cored wire for welding a high-manganese steel lining plate and a surfacing method, and belongs to the technical field of surface strengthening of mining machinery. A flux core of the welding wire is composed of high-carbon ferrochrome powder, graphite powder and a small amount of ferrosilicon, ferromanganese, ferrotitanium, ferroboron and nickel powder, an outer skin is a low-carbon cold-rolled steel strip, the diameter of the outer skin ranges from 2.4 mm to 3.2 mm, and the filling rate of the outer skin ranges from 38% to 50%. According to the surfacing method, plasma arc automatic surfacing is adopted during welding, paraxial wire feeding is conducted, and argon protection is conducted; controlling the surface temperature of the high-manganese steel lining plate; the thickness of a single-layer surfacing layer is about 3 mm, the hardness is 58-65 HRC, the single-layer surfacing layer is metallurgically bonded with high manganese steel without cracks, the longitudinal deformation of the lining plate is smaller than or equal to 1.9 mm, and the wear resistance is improved to 2.0-3.3 times that of a base material. The high-carbon ferro-chrome serves as a main raw material, the raw material particle size range is wide, the welding wire cost is low, the process is stable, and the method is suitable for on-site rapid repairing and new piece strengthening of the ball mill end cover high-manganese steel lining plate.

The invention provides a method for producing ferrotitanium powder by reducing ilmenite. The method comprises the following steps: carrying out homogenization pretreatment on raw materials; dynamically proportioning a biomass-coal mixed reducing agent; multi-source online spectrum monitoring closed-loop feedback control is carried out; adding a nano CaO-Na2O composite catalyst in a buffer manner; and performing multi-stage magnetic separation reforming on the finished product. The method has the beneficial effects that through the synergistic effect of various innovative units, the fluctuation of raw materials and reducing atmosphere is reduced through pretreatment homogenization and dynamic proportioning, the real-time optimum reaction in the furnace is guaranteed through spectrum monitoring closed-loop control, the reaction rate is increased through the nano-catalyst, iron particle formation and magnetic separation reforming are fully separated, and products are utilized. According to the process, the direct reduction process of the ilmenite is precisely regulated and controlled, the content of TiO2 in the produced titanium-rich material is stabilized at 90-92%, the FeO residue is lower than 2%, the total recovery rate of metallic iron reaches 90% or above, and the energy consumption of unit output is reduced by about 15% compared with that of a traditional process. The process provides a new way for clean and efficient utilization of titanium resources.

The invention provides a lunar surface ilmenite screening device and a screening method thereof, and belongs to the technical field of lunar in-situ resource development. The problems that the lunar surface reselection efficiency is low, traditional equipment in a lunar surface extreme environment is poor in adaptability, and the traditional equipment is large in size and high in power consumption are solved. An anti-blocking feeding hopper is eccentrically installed on the left side of the top of a shell of the device, a primary screening net is installed at the bottom of the anti-blocking feeding hopper, an upper-layer screening net and a lower-layer screening net are arranged in the shell from top to bottom in parallel, a first electromagnet is installed above each layer of screening net, and each layer of screening net vibrates through a high-frequency micro-vibrator; a partition plate is eccentrically installed on the right side of the upper-layer screening net, a ferrotitanium ore collecting bin and an impurity collecting bin are arranged below the lower-layer screening net, and a second electromagnet is installed at the bottom of the ferrotitanium ore collecting bin. The screening mechanism special for the ilmenite is suitable for the extreme environment of the lunar surface and has the characteristics of efficient screening, light weight and low power consumption.

This invention provides a flux-cored welding wire, its preparation method, and its application, belonging to the field of welding technology. The flux-cored welding wire of this invention comprises a steel strip and a flux core, wherein the flux core is filled in the steel strip. The flux core comprises the following raw materials in the following mass percentages: ferrosilicon 3%~8%; ferromanganese 15%~22%; nickel powder 2.5%~3.5%; ferromolybdenum 0.5%~1.2%; ferrotitanium 0.8%~1.5%; ferroboron 0.05%~0.1%; aluminum powder 0.08%~0.15%; cerium oxide 0.05%~0.15%; the balance being iron powder and unavoidable impurities. This invention's flux-cored welding wire, by introducing appropriate proportions of ferrotitanium, ferroboron, aluminum powder, and cerium oxide into the flux core, ensures that the weld deposited when welding thick metal plates has low porosity, high strength, and excellent low-temperature toughness, thereby effectively meeting the welding requirements of thick-walled ethylene spherical tanks.

The invention discloses a metal powder core welding wire suitable for underwater high-pressure dry method welding and a preparation method and application thereof. A skin of the metal powder core welding wire is made of copper-plated low-carbon steel, and a powder core comprises manganese powder, ferrosilicon powder, nickel powder, ferrotitanium powder, rare earth alloy powder, an arc stabilizer and low-sulfur ferrophosphorus powder. The preparation method of the metal powder core welding wire comprises the following steps that the surface of a low-carbon steel strip is electroplated with copper, then the low-carbon steel strip is rolled into a U-shaped groove, powder core raw materials are mixed and dried, then the U-shaped groove is filled with the powder core raw materials, then the U-shaped groove is closed, drawing and diameter reducing are conducted, and the metal powder core welding wire is obtained. The metal powder core welding wire is suitable for a high-pressure dry method welding environment about 300 meters underwater, and has the advantages that the conductivity is good, the corrosion resistance is good, the diffusible hydrogen content of formed deposited metal is low, welding air holes and cold cracks can be effectively inhibited, and the strength, low-temperature toughness and plasticity of a welding seam can be remarkably improved; and the requirement for rapid welding repair of the ship body in an underwater rescue scene is completely met.

The invention belongs to the technical field of metallurgy, and particularly discloses a method for preparing a ferrotitanium alloy by using melt separation titanium slag and vanadium-titanium metallized pellets as raw materials, which comprises the following steps: S1, proportioning and mixing the melt separation titanium slag, the vanadium-titanium metallized pellets, an aluminum reducing agent and a slag former as raw materials according to the chemical components of the target ferrotitanium alloy to obtain a charging material; s2, the charging material is subjected to high-temperature smelting; and S3, after smelting is finished, cooling to room temperature, crushing slag shells, and performing slag-metal separation to obtain the ferrotitanium alloy. According to the method, the molten titanium slag is externally matched with the vanadium-titanium metallized pellets, the ferrotitanium alloy is directly prepared by adopting an aluminothermic reduction process one-step method in auxiliary heating modes such as electric heating, two vanadium-titanium secondary resources are cooperatively treated, and the method has the advantages of being short in technological process, low in production cost, good in slag-metal separation, high in yield of elements such as ferrotitanium and the like and the like, and is suitable for industrial application.

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of ferrotitanium. The preparation method of the ferrotitanium comprises the following steps: adding an auxiliary material and a reducing agent into titanium slag, uniformly mixing, and roasting and reducing to obtain the ferrotitanium alloy; wherein the reducing agent is Al powder, and the adding amount of the reducing agent is 50-70% of the weight of the titanium slag; the auxiliary materials comprise Fe2O3 powder, CaO powder and fluorite powder; the adding amount of the Fe2O3 powder is 5-20% of the weight of the titanium slag; the adding amount of the CaO powder is 120-140% of the weight of the titanium slag; the addition amount of the fluorite powder is 5-10% of the weight of the titanium slag; the content of TiO2 in the titanium slag is greater than or equal to 70wt%. The ferro-titanium alloy is prepared through one-step roasting reduction based on the aluminothermic reduction method, efficient extraction of titanium content in the titanium slag is achieved, meanwhile, the content of impurity elements such as silicon and oxygen is reduced, and the ferro-titanium alloy product meets the industrial requirement of high-grade alloy.

This invention relates to a medium-frequency furnace melting process for 316Ti material. This innovative process effectively solves the problems of high titanium loss rate and difficult inclusion control through the synergistic effects of full-process argon protection, pre-baking of ferrotitanium, two-stage addition of a specific composite refining agent, and strong stirring during final treatment. Compared with traditional methods, this invention can stably increase the titanium yield to over 92% and significantly improve the morphology and distribution of inclusions in the material, ultimately greatly enhancing the corrosion resistance and fatigue strength of 316Ti material. This process has strong adaptability, low overall cost, and is particularly suitable for the industrial production of high-quality special stainless steels.

This invention relates to the field of welding wire technology, specifically to a 1200MPa grade high-strength, high-toughness flux-cored welding wire, its preparation method, and its applications. The 1200MPa grade high-strength, high-toughness flux-cored welding wire comprises an outer sheath and a flux core. The flux core, by weight percentage, comprises: 0.4%~0.7% graphite powder, 3.0%~5.0% silicon powder, 12.0%~16.0% manganese powder, 2.5%~5.0% chromium powder, 18.0%~25.0% nickel powder, 5.0%~8.0% molybdenum powder, 1.0%~2.0% ferrotitanium, 1.0%~3.0% ferroboronium, 1.0%~3.0% ferrizirconium, 0.2%~0.5% potassium fluorotitanate, 0.1%~0.3% rare earth fluoride, with the balance being iron powder. The flux core of this welding wire has a specific composition, especially with the addition of potassium fluorotitanate and rare earth fluoride, which have low ionization potentials. Utilizing their grain-refining, arc-stabilizing, and hydrogen-removing effects, the weld quality can be effectively optimized.