265 results about "Ferrosilicon" 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 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 relates to the technical field of amorphous nanocrystalline mother alloy smelting, and discloses a low-cost iron-based amorphous nanocrystalline mother alloy non-vacuum smelting method based on high-aluminum niobium silicon iron, which comprises the steps of material distribution and heating smelting in a furnace, alloying and primary refining, slagging and secondary soft argon blowing refining as well as slagging-off and tapping. By means of the argon blowing process and the secondary refining slagging process in a non-vacuum smelting system, the exogenous inclusions introduced by the high-aluminum niobium silicon iron can be removed to the maximum extent. The production cost of the master alloy can be remarkably reduced, the cleanliness of the master alloy can be improved, and the method has economical efficiency and practicability and is suitable for industrial large-scale popularization and application.

The invention relates to the technical field of blast furnace iron making, and particularly discloses a blast furnace composite stemming and a preparation method thereof.The blast furnace stemming is prepared from, by mass, aggregate including (43-X1-X2-X3)% of brown fused alumina, 13% of coke, (16-B)% of SiC, B% of clay, 4.5% of sericite, 7% of kyanite, 7.5% of silicon carbide iron, 4% of ball pitch, 5% of iron area waste mixture, 1% of iron oxide scale Fe3O4 X, 2% of cubic boron nitride c-BN X and 3% of graphene oxide GO X; comprising the following components in percentage by weight: 13-C% of tar, C% of asphalt and 2% of sodium pyrophosphate Na4P2O7; according to the method, stemming softening caused by excessive use of the oxide scale when the cold air pressure is low is prevented, the problems of incomplete internal structure and insufficient strength development of stemming caused by insufficient heat are avoided, excessive use of nanoscale materials is avoided, and the material cost is reduced.

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.

This invention discloses a method for extracting aluminum from fly ash, red mud, and coal gangue and preparing ferrosilicon alloy, belonging to the field of solid waste resource comprehensive utilization technology. The key technical points include: raw material pretreatment, material mixing, roasting reaction, alkali dissolution carbon treatment, and separation and purification steps. Coal gangue is used as a carbonaceous reducing agent, mixed with fly ash, red mud, or iron-containing powder in a specific ratio, roasted under an inert atmosphere or vacuum environment, and then aluminum hydroxide is extracted by alkali dissolution carbon. Finally, ferrosilicon alloy and corresponding byproducts are obtained by wet magnetic separation. This invention achieves synergistic high-value utilization of multiple industrial solid wastes, reduces the environmental pressure of solid waste storage, and has the advantages of short process, low energy consumption, low cost, and high product purity, making it suitable for large-scale industrial applications.

The application discloses a method for reducing energy consumption by optimizing production of a natural power factor and secondary voltage of a ferrosilicon electric arc furnace, and belongs to the technical field of ferrosilicon smelting. The method solves the problems of low power factor, blind secondary voltage regulation, high power consumption and poor furnace stability in the traditional process. The method comprises three-stage operation methods. The first stage is a voltage lifting and furnace condition adapting stage, the second stage is a voltage stabilizing and parameter coordinating optimizing stage, and the third stage is a parameter solidifying and efficiency enhancing stage. The method takes the improvement of the operating resistance of the electric arc furnace as the core, controls the whole process in stages, constructs a benign smelting cycle of "high voltage-low current-high power factor", realizes the synchronous optimization of the natural power factor and the secondary voltage, and greatly improves the economy and production stability of the ferrosilicon smelting.

This invention provides a high-hardness, crack-free flux-cored welding wire and its preparation method. The flux-cored welding wire includes an outer sheath and a flux core. By weight, the flux core comprises the following components: boron carbide 5.6-8.6 parts; 75% ferrosilicon 3.1-4.6 parts; electrolytic manganese 0.6-1.6 parts; 80% ferrovanadium 0.3-1.2 parts; nickel powder 0.3-1.0 parts; 68% high-carbon ferrochrome 67.5-94.5 parts; and iron powder 6-6.5 parts. The preparation method of the flux-cored welding wire is as follows: [The following components are listed:] boron carbide, 75% ferrosilicon, electrolytic manganese, 80% ferrovanadium... Ferrovanadium, nickel powder, 68% high-carbon ferrochrome, and iron powder are added sequentially to a dryer and dried for 2-3 hours. The mixture is then thoroughly mixed using a three-dimensional motion mixer and placed in an insulated box for later use. The outer sheath is placed on a forming machine, which rolls the outer steel strip into a U-shaped groove. Flux-cored powder is added to the U-shaped groove, and the forming machine closes and pulls the groove to obtain the flux-cored welding wire. The flux-cored welding wire of this invention features high hardness, no cracks, high temperature resistance, and corrosion resistance. Furthermore, the low production cost of the flux-cored welding wire facilitates industrial production.

The application discloses a method for regulating solidification structure of aluminum-silicon-iron alloy by gas-phase synergistic double-melt blending. CH4 gas is introduced into high-temperature aluminum-titanium alloy liquid, C-containing active particles are decomposed from the CH4 gas in the alloy melt and gas-liquid reaction occurs between the C-containing active particles and Al and Ti particles to generate intermediate phases such as Al4C3 and Ti3AlC and unstable TiC particles, and the intermediate phases react to generate thermodynamically stable TiC nanoparticles. Meanwhile, aluminum-silicon alloy melt and aluminum-iron alloy melt with significant difference in volume and temperature are blended in a controlled diffusion manner to obtain aluminum-silicon-iron melt. During the gas-liquid blending process, due to the opposite directions of solid / liquid interface advancing direction and solute diffusion direction during melt solidification, there exist non-local micro temperature and concentration fluctuations, and grain refinement is realized by controlling the solidification nucleation and diffusion growth process. The gas-liquid casting technology is a new process with multiple processes in synergistic action, and multiple processes can have a superposition effect under synergistic action, so that the synergistic refinement of aluminum-silicon-iron alloy second phase and aluminum grains is realized.

The invention provides a preparation method of a high-wear-resistance alloy lining plate, and relates to the technical field of wear-resistance alloys, carbon steel and pig iron are mixed, heated and melted, high-carbon ferromanganese, medium-carbon ferrochrome and ferrosilicon are added, heating refining is carried out, aluminum powder is added, the mixture is put into a mold, cooling and demolding are carried out, heating homogenization, quenching and cooling are carried out, and a mother plate is prepared; mixing bismaleimide, the composite powder and sepiolite fibers, heating and stirring, coating a mother board with the mixture, firstly applying negative pressure, then applying positive pressure, heating and cooling to obtain a substrate layer; and placing the mother board in magnetron sputtering equipment, sputtering on the substrate layer to obtain a chromium nitride functional layer, and cooling to obtain the high-wear-resistance alloy lining board. The composite powder is prepared by mixing and heating chromium carbide powder and a hydrogen peroxide solution, filtering, mixing with an ethanol solution and gamma-aminopropyltriethoxysilane, heating, condensing and refluxing, washing and drying, and mixing and heating with amine-terminated polyether and N, N-dimethylformamide. The wear-resistant stability of the alloy lining plate can be improved.

The invention provides an application and a device of recycled silicon powder in polycrystalline silicon production in ferrosilicon smelting. High-purity fine silicon powder generated in the polycrystalline silicon production process is recycled and used for ferrosilicon smelting, resource utilization of industrial solid waste is achieved, and remarkable environmental protection and economic value is embodied. The high-purity silicon powder can be directly subjected to a solid-phase reduction reaction with iron oxide in furnace charge, so that the consumption of coke or other carbon sources is reduced, the emission of carbon dioxide is reduced, and the energy consumption required for reducing silica into silicon is also reduced. According to the scheme, complex impurity removal treatment is not needed, the silicon powder can participate in the reduction reaction through segmented blowing of the blast furnace tuyere, operation is easy and convenient, the source is stable, the quality uniformity of raw materials is guaranteed, and therefore the chemical component controllability and the smelting efficiency of silicon iron products are improved. The recycled silicon powder is small in particle size, large in specific surface area and high in reaction rate, the smelting time can be further shortened, and the overall production efficiency is improved.

This invention relates to the field of ferroalloy smelting technology and discloses a high-carbon ferromanganese and its preparation method, comprising the following steps: raw material pretreatment; converter preheating and bottom material laying: pretreated high-grade manganese ore, lime, and coke powder are mixed and added as bottom material to the CLU converter for preheating; iron addition and initial reduction: high-carbon ferromanganese is added to the converter, and graphite fragments are added, and initial reduction is carried out under a pure argon atmosphere; atmosphere control and second-stage reduction: when the carbon content of the molten iron drops to 5.0-5.8%, the reblowing gas is switched to a mixed gas of argon, CO, and CH4, and the remaining high-grade manganese ore, silicon carbide, ferrosilicon manganese alloy, and supplementary coke powder are added in batches, while adjusting the slag composition; endpoint judgment and iron tapping. The high-carbon ferromanganese of this invention has precise composition and high purity, and the preparation method is characterized by high efficiency, low consumption, greenness, and high manganese recovery rate, enabling the industrial-scale production of high-carbon ferromanganese.

The invention discloses a rare earth silicon carbon composite deoxidizer with a double-component design. The deoxidizer comprises the following components in percentage by mass: 20-30% of rare earth silicon iron alloy particles with the particle size of 5-10 mm, 70-80% of carbon particles with the particle size of 1-5 mm, and a binder, wherein the first deoxidizer comprises the following components in percentage by mass: 20-30% of rare earth silicon iron alloy particles with the particle size of 5-10 mm; and the second deoxidizer comprises the following components in percentage by mass: 80-90% of rare earth ferrosilicon alloy particles with the particle size of 5-10 mm, 10-20% of carbon particles with the particle size of 1-5 mm, and the balance of a binder. The invention also discloses a deoxidation method during use. According to the deoxidizing method, the deoxidizing efficiency is high, the cost is low, safety and stability are achieved, deoxidizing products are few, the performance of steel is not affected, and meanwhile the deoxidizing agent capable of replacing expensive aluminum materials and the deoxidizing method capable of being accurately controlled are achieved.

The utility model discloses a ferro-silicon alloy screening and classifying device, which belongs to the technical field of ferro-silicon alloy processing equipment and comprises a screening box, a screening component for sorting ferro-silicon alloy, a dust absorption component for absorbing and transferring dust generated in the sorting process and a purification component for purifying dust gas, the dust collection assembly is arranged on one side of the screening box, the purification assembly is arranged on the dust collection assembly, the screening assembly is arranged in the screening box, a connecting assembly is arranged between the screening box and the screening assembly, a sealing assembly is arranged on the purification assembly, and an inclined plate is fixedly arranged on the inner bottom wall of the screening box; dust gas in the screening box is absorbed and transferred under the action of the dust absorption assembly, and the dust gas is purified under the action of the purification assembly, so that the dust content in the air is reduced, and the situation that a respiratory system and the like of an operator are possibly damaged and occupational diseases such as pneumoconiosis are caused by long-term inhalation of ferrosilicon alloy dust is avoided.

The present invention relates to the field of carbon-ceramic composite materials, in particular to a non-dense carbon-ceramic friction material, and a preparation method therefor and the use thereof. The non-dense carbon-ceramic friction material is obtained by subjecting a C / C-Si green body to a silicon infiltration treatment using silicon powder. The raw materials for preparing the C / C-Si green body comprise chopped carbon fibers, graphite powder, a ferrosilicon mixture, silicon carbide powder, boron nitride powder, and phenolic resin powder. The non-dense carbon-ceramic friction material is made to have a porosity of 15-25 vol.%, a high-temperature resistance limit of 1350°C and a compressive strength of 80.5 ± 2.4  MPa; therefore, a friction plate prepared therefrom exhibits a wear amount of 52.8-95.0  μm and a friction coefficient of 0.6-0.7 in an AK master program test. Compared with friction materials in the prior art, the non-dense carbon-ceramic friction material has the advantages of a non-dense structure, a light weight, high-temperature resistance, etc.

The invention discloses an oxygen-controlled inversely-proportional alkaline slag system 2.25% Cr-1% Mo-0. 25V steel welding rod for a hydrogenation reactor and a preparation method thereof, and belongs to the technical field of welding materials. The problem that a 2.25% Cr-1% Mo-V steel welding rod is poor in low-temperature toughness is solved. The welding rod is composed of a core wire and a coating on the surface of the core wire. The coating comprises CaF2, CaCO3, iron powder, quartz, 45 # ferrosilicon, electrolytic manganese, metal chromium powder, molybdenum powder, nickel powder, magnesium powder, titanium-boron alloy and sodium carbonate. A CaF2-CaO-SiO2 type inverse-proportion low-hydrogen alkaline slag system is adopted, so that non-metallic inclusions of deposited metal can be reduced, and weld joints are purified; and magnesium powder and MgO which has a deoxidizing effect and reacts with Mg and O are added into the coating, so that the alkalinity of the slag is improved, the inclusions in the slag are further reduced, the purity of the welding seam is improved, and the low-temperature impact toughness of deposited metal is improved. The welding rod is used for hydrogenation reactor welding.

The utility model discloses a special-shaped conducting bar intermediate frequency DC reactor which comprises a first iron core column, a second iron core column, first ferrosilicon, second ferrosilicon, a first stainless steel clamping piece, a second stainless steel clamping piece, a first coil, a second coil, a first upper iron yoke, a second upper iron yoke, a first special-shaped conducting bar and a second special-shaped conducting bar. One end of the first iron core column and one end of the second iron core column are spliced and connected through first silicon iron, the first silicon iron is clamped through a first stainless steel clamping piece, the other end of the first iron core column and the other end of the second iron core column are spliced and connected through second silicon iron, the second silicon iron is clamped through a second stainless steel clamping piece, the first coil is wound outside the first iron core column, and the second coil is wound outside the second iron core column. The first coil is sleeved with the first upper iron yoke, the second coil is sleeved with the second upper iron yoke, the first special-shaped conducting bar is installed on the first upper iron yoke, and the second special-shaped conducting bar is installed on the second upper iron yoke. The utility model has the advantages of high performance, small volume, light weight, low loss, small leakage flux and the like.

The utility model relates to the field of screening and grading for iron silicon aluminum soft magnetic powder production, disclose a kind of screening and grading device for iron silicon aluminum soft magnetic powder production, including rack, the rack top is provided with feed hopper, the feed hopper bottom is fixedly connected with discharge hopper, the rack top is provided with filter screen, the rack side wall is provided with dismounting assembly, the rack outer wall is provided with cleaning assembly;The dismounting assembly includes clamping post, the clamping post outer wall is arranged in the discharge hopper side wall, the discharge hopper inside is rotatably connected with rotating column, the rotating column top is provided with knob, the knob bottom is provided with shell.In the utility model, when needing to replace brush, rotating knob, after driving clamping post displacement, make spring be compressed, with driving limit post rotation, make it separate from sliding slot three, let its outer wall slide in sliding slot one, after driving limit post bottom separates from brush top, reach the effect that brush is replaced conveniently.

The invention belongs to the technical field of iron-silicon-aluminum magnetic materials, and provides a method for preparing an iron-silicon-aluminum magnetic powder core by using silicon steel waste, which comprises the following steps: powder preparation, proportioning, coating, granulation, pressing and annealing. According to the method, the silicon steel waste serves as the raw material, the silicon steel waste, the silicon iron, the aluminum ingot, the ferrophosphorus and the electrolytic iron are placed in the vacuum induction furnace to be smelted and then prepared into powder, the prepared iron-silicon-aluminum powder is coated, granulated, pressed and annealed to obtain the iron-silicon-aluminum magnetic powder core, high-value utilization of the silicon steel waste is achieved, the raw material cost is remarkably reduced, and environmental protection and energy saving are achieved.

The invention relates to a cast iron inoculant and to a method for producing a cast iron inoculant for producing cast iron with spheroidal graphite, comprising a granular ferrosilicon alloy consisting of, by weight, 40 to 80% Si, 0.02 to 8% Ca, 0 to 5% Sr, 0 to 12% Ba, 0 to 10% rare earth metals, 0 to 5% Mg, 0.05 to 5% Al, 0 to 10% Mn, 0 to 10% Ti, 0 to 10% Zr, the remainder being Fe and a conventional amount of incidental impurities, wherein it additionally contains, by weight based on the total weight of the inoculant: 0.1 to 15% of a particulate rare earth metal oxide and at least one of the following: 0.1 to 15% of particulate Bi2O3, 0.1 to 15% of particulate Bi2S3, 0.1 to 15% of particulate Sb2O3, 0.1 to 15% of particulate Sb2S3, 0.1 to 5% of one or more of particulate Fe3O4, Fe2O3, FeO, or mixtures thereof, and / or 0.1 to 5% of one or more of particulate FeS, FeS2, Fe3S4, or mixtures thereof; a process for producing such inoculants; and the use of such inoculants.

The application belongs to the technical field of soft magnetic material preparation, and particularly relates to a ferrosilicon magnetic material and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing ferrosilicon magnetic powder and a passivation agent, and then performing primary heat treatment and cooling to room temperature at a speed of not higher than 30 DEG C / h; (2) mixing the magnetic powder obtained in the step (1) with the passivation agent to obtain passivated magnetic powder; (3) adding a first coating agent to the passivated magnetic powder to perform primary coating, and then performing secondary heat treatment; and (4) adding a second coating agent to the magnetic powder obtained in the step (3) to perform secondary coating, pressing, and then performing tertiary heat treatment. The average particle size of the first coating agent is 300 nm-1 mu m; and the second coating agent comprises colloidal particles, and the average particle size of the colloidal particles is not higher than 100 nm. The preparation method can improve the density and effective magnetic permeability of the ferrosilicon magnetic material, so that the ferrosilicon magnetic material has excellent magnetic performance, the loss is greatly reduced, heat generation is reduced, and the device is beneficial to energy saving and high efficiency.

A composition includes a core-shell structure. The core-shell structure includes a core material and a shell material. The shell material is farther away from a center of the core-shell structure than the core material. The core material includes a structural element oxide. The structural element oxide includes a structural element. The structural element includes at least two selected from the group consisting of lithium, titanium, niobium, cobalt, copper, tin, silicon, iron, manganese and nickel. The shell material includes a mixed material. The mixed material includes a modified silicon material. The modified silicon material includes a silicon material and a polymer.

This utility model discloses a horizontal foil-wound iron-silicon DC reactor, comprising an iron core, a first foil-wound coil, a second foil-wound coil, an input conductive bus, an output conductive bus, a left clamp, and a right clamp. The iron core includes columns A to D. The first foil-wound coil is wound on column A, and a first conductive bus groove is provided in a first gap. The input conductive bus is connected to the first conductive bus groove, and its input end extends from one end of the first foil-wound coil. The second foil-wound coil is wound on column B, and a second conductive bus groove is provided in a fourth gap. The output conductive bus is connected to the second conductive bus groove, and its output end extends from one end of the second foil-wound coil. A first heat sink is connected between the upper parts of the first and second foil-wound coils, and a second heat sink is connected between the lower parts of the first and second foil-wound coils. This utility model has low loss characteristics and strong heat dissipation capacity, and can generate significant social benefits in terms of energy saving, safety, and industrial upgrading.

The invention discloses a method for preparing a high-performance rare earth magnesium-silicon-iron alloy through cooperation of pulsed magnetic field treatment and multi-element microalloying, and belongs to the technical field of metallurgy. The method comprises the following steps: smelting ferrosilicon-based alloy liquid in a submerged arc furnace; the base liquid is thermally loaded into a medium-frequency induction furnace, trace elements such as Ba, Sr, Sb and Bi are added in a cored wire feeding mode, and electromagnetic stirring is conducted to achieve multi-element microalloying; the alloy liquid is heated and then subjected to pulsed magnetic field treatment, the parameters are as follows: the magnetic field intensity is 0.5-3.0 T, the pulse frequency is 5-30 Hz, and the treatment time is 5-20 minutes; then adding magnesium and nitrogen under pressure and stirring; and finally, casting and quickly cooling under the protection of nitrogen. The solidification structure is refined through the pulsed magnetic field, the yield of microelements is increased through core-spun yarn feeding, the magnesium oxide content is reduced through nitrogen protection in the whole process, segregation is restrained through rapid cooling, the magnesium oxide content in the prepared alloy is smaller than or equal to 6% of the magnesium content, the macrosegregation degree is smaller than or equal to 0.3, and the average grain size is smaller than or equal to 50 micrometers. The alloy prepared through the method is good in spheroidizing stability, uniform in structure, low in cost and suitable for production of high-end nodular iron castings.

The application provides a 650MPa-grade ultra-supercritical high-temperature steel welding electrode and a coating and deposited metal, and belongs to the field of welding materials.The raw material of the coating comprises, in weight parts, 39-43 parts of magnesia, 30-35 parts of fluorite, 3-5 parts of dolomite, 5-10 parts of ferrosilicon, 2-5 parts of sodium titanate, 10-15 parts of metallic chromium powder, 0.1-0.4 parts of chromium oxide green, 0.1-0.3 parts of aluminum-magnesium alloy and 1.5-2.5 parts of sodium alginate.Through the research on the composition of the coating, the sodium titanate and the aluminum-magnesium alloy are added to stabilize the electric arc, the electric arc has stability and concentration when high-current welding is performed, the weld pool temperature is moderate, the fluidity of the molten iron is moderate, the electric arc blowing force is stable and concentrated, and the welding operation performance is good.

The application discloses a kind of corrosion-resistant reducing flange and preparation method thereof, belong to reducing flange preparation technical field, manganese iron, silicon iron, iron ingot, copper ingot and graphite quality carbon additive are added into smelting furnace, smelt under argon protection, then add slag remover and stir evenly, after deslagging, rare earth alloy with silica coated magnesium oxide nano powder smelted is added, continue smelting, alloy liquid is cast into mould, and is cast into shape, it is immersed in electrolyte and is treated by anodic oxidation, surface is coated with polyamide imide primer, after solidification, polytetrafluoroethylene powder finish is sprayed using electrostatic spraying equipment, after electrostatic spraying, reducing flange semi-finished product is transferred to curing oven, and is cooled and taken out, to obtain a kind of corrosion-resistant reducing flange;The corrosion-resistant reducing flange has good high adhesion, high temperature resistance, long-acting anticorrosion performance.

The application belongs to the technical field of steel smelting equipment, in particular to a 82B smelting furnace capable of improving liquid level fluctuation of a continuous casting crystallizer, which comprises a bottom plate and a furnace lining; a lifting mechanism is arranged at one end of the top of the bottom plate, a furnace body is arranged inside the furnace lining; a pulling mechanism is arranged at the other end of the top of the bottom plate and rotates through the output shaft of a motor, synchronously controls the pulling mechanism and the lifting mechanism, and tilts when the height of the furnace body is lowered, so as to further reduce the distance between the discharge port of the furnace body and the receiving grinding tool, replace refined ferrosilicon with silicon carbide to be added into the furnace body through the discharge port during tapping, solve the problem of insufficient height adjustment of the furnace body, pour out the molten steel from a high place, have a large potential energy, easily produce liquid level fluctuation during continuous casting pouring, and due to high magnesia basicity of the furnace lining and poor flowability of the molten steel, the molten steel cannot be effectively decontaminated during refining, so as to frequently cause liquid level fluctuation, cause a large amount of billet cutting waste, and affect the production cost.

The invention provides a high-chromium cast iron surfacing flux-cored wire for a shield tunneling machine and a preparation method of the high-chromium cast iron surfacing flux-cored wire. The high-chromium cast iron surfacing flux-cored wire is formed by wrapping powder with a steel belt, and the powder accounts for 33.0%-36.0% of the total weight of the flux-cored wire; the powder comprises, by mass, 3%-8% of reduced iron powder, 1%-3% of fluorite, 0.5%-1% of rare earth fluoride, 3%-8% of electrolytic manganese, 1%-5% of high silicon iron, 80%-85% of ferrochrome carbide, 5%-9% of graphite and 1%-3% of nickel powder. Wherein the rare earth fluoride is cerium fluoride. The high-chromium cast iron surfacing flux-cored wire for the shield tunneling machine is excellent in welding process, stable in electric arc, small in splashing, attractive in forming and capable of conducting all-position welding.

The invention discloses a high-manganese steel flux-cored wire for surfacing and a preparation method of the high-manganese steel flux-cored wire, and relates to the technical field of welding materials, the high-manganese steel flux-cored wire is composed of a steel outer skin and a flux core, the flux core is wrapped in the steel outer skin, and the flux core comprises, by weight, 0.1-0.6 part of natural rutile, 0.2-0.8 part of ferrosilicon powder and 0.1-0.3 part of potassium titanate. The material comprises, by weight, 20-30 parts of magnesium powder, 0.1-0.4 part of magnesium powder, 0.1-0.3 part of fluoride, 8-11 parts of electrolytic manganese powder and 0.1-0.5 part of quartz sand. Through organic combination of the components, the Brinell hardness HB of deposited metal after welding of the welding wire is larger than or equal to 170. And the wear resistance of the whole welding seam is effectively improved. The welding process performance is good, electric arcs are stable, splashing is small, and formed weld joints are attractive.

The application discloses a method for directly reducing, electrically smelting and magnetically separating and recovering iron and aluminum from high-iron bauxite, and belongs to the technical field of ore smelting. The method comprises the following steps: (1) crushing and finely grinding high-iron bauxite and reduction coal and uniformly mixing the high-iron bauxite and the reduction coal; (2) directly reducing in a pipe furnace to obtain reduced ore; (3) weakly magnetically separating the reduced ore to screen out aluminum concentrate and iron concentrate, and spreading a layer of reduction coal powder on the surface of the iron concentrate; (4) strongly magnetically separating the aluminum concentrate to screen out high-quality bauxite and iron-aluminum spinel; (5) uniformly mixing the high-quality bauxite and the iron concentrate with the layer of reduction coal powder and feeding the mixture into an electric arc furnace for smelting, and taking out a copper pot for cooling after the smelting is completed; and (6) breaking and magnetically separating after the copper pot is naturally cooled to obtain ferrosilicon alloy and high-purity aluminum oxide. The method can effectively recover iron and aluminum in high-iron bauxite.