442 results about "Ferrosilicon" patented technology

The invention discloses a production method of ferrous dihydrogen phosphate, which comprises the following steps of: changing an iron source of iron-process iron phosphate from traditional iron blocks or iron powder into oxide scale, compounding phosphoric acid and sulfuric acid into mixed acid, and controlling the granularity of the oxide scale and the components and acidity of the mixed acid to solve the problems of dissolution and passivation of the oxide scale. According to the method, iron oxide scale can be better dissolved, the residual problem of ferric ions is solved by reducing excessive iron blocks or iron powder, undissolved impurities such as carbon, silicon and iron are removed by filtering, and finally, the stability problem of a reaction system is solved by adjusting the pH value of the system through industrial phosphoric acid and pure water, so that a ferrous dihydrogen phosphate solution required for producing iron phosphate is obtained. The production cost of an iron source required by iron phosphate is greatly reduced, other impurities are not contained, and mixed acid-containing filtrate and washing water generated in the production process can be recycled through an evaporation device.

The invention provides a sound-insulation porous ceramic tile and a preparation method thereof, and belongs to the field of building materials. The sound-insulation porous ceramic tile is prepared from the following raw materials: 20 to 30 parts of kaolin, 18 to 22 parts of quartz sand, 12 to 18 parts of potassium feldspar, 3 to 7 parts of talcum powder, 3 to 7 parts of silicon carbide powder, 2 to 4 parts of ferrosilicon alloy powder, 0.5 to 1.5 parts of sodium bicarbonate, 3 to 5 parts of hollow glass beads, 1 to 3 parts of zirconium oxide microspheres, 1 to 3 parts of silicon dioxide aerogel particles, 3 to 5 parts of acrylate emulsion, 1 to 3 parts of butadiene styrene rubber emulsion, 0.5 to 1.5 parts of polyvinyl alcohol solution and 1 to 2 parts of polyurethane dispersion. The composite material comprises the following components in parts by weight: 30-60 parts of polypropylene, 0.3-0.7 part of a dispersing agent, 0.2-0.4 part of a defoaming agent, 0.8-1.6 parts of reinforced fibers and 9-13 parts of deionized water. The raw materials of the porous ceramic tile are reasonably designed, the sound insulation performance of the porous ceramic tile is improved, and full-band efficient sound insulation is achieved.

The invention discloses a multi-stage graded crushing and particle size homogenization control method for ferrosilicon crushing. The method comprises the following steps: S1, raw material characteristic perception and pretreatment; s2, self-adaptive multi-stage crushing; s3, performing dynamic coupling classification screening; s4, performing intelligent closed-loop optimization; according to the method, the problem of granularity fluctuation caused by parameter adjustment lag in a traditional control method is avoided through the self-adaptive PID algorithm, the pertinence and the real-time performance of crushing parameter adjustment are remarkably improved, and an accurate parameter basis is provided for granularity gradient control; the grading and crushing parameter coupling model realizes dynamic matching of the grading efficiency and the crushing load, so that the process redundancy caused by invalid material returning is reduced while the granularity screening precision is ensured; the equipment wear compensation machine learning model can accurately quantify granularity drift caused by equipment characteristic difference in different crushing stages, and the long-term stability of granularity prediction is improved.

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 welding materials, in particular to a titanium carbide reinforced iron-based wear-resistant corrosion-resistant flux-cored wire for surfacing on the surface of a conveying roller. According to the specific technical scheme, the flux core comprises, by mass, 10%-20% of graphite, 25%-35% of ferrotitanium, 2%-6% of ferrovanadium, 3%-8% of electrolytic manganese metal, 2%-10% of ferromolybdenum, 5%-15% of ferrosilicon, 2% of aluminum-magnesium alloy and the balance Fe powder. According to the flux-cored wire prepared through the flux core, the surfacing alloy obtained through electric arc surfacing is good in surfacing manufacturability, attractive in weld joint forming and small in surface air hole number, and the flux-cored wire has high hardness, high-temperature abrasion resistance and corrosion resistance.

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 flux-cored wire, a manufacturing method of the flux-cored wire, a gas-shielded arc welding method and deposited metal. The flux core of the flux-cored wire comprises the following components in percentage by weight: 27.5 to 29.5 percent of rutile, 1.0 to 2.0 percent of ferrovanadium, 0.2 to 0.3 percent of bismuth oxide, 0.8 to 1.2 percent of cryolite, 12.5 to 15.0 percent of high-carbon ferrochrome, 5.0 to 6.5 percent of electrolytic manganese metal, 4.5 to 6.5 percent of metal nickel, 1.0 to 3.0 percent of feldspar, 1.5 to 2.5 percent of ferromolybdenum, 1.0 to 2.5 percent of aluminum-magnesium alloy, 32.0 to 35.0 percent of micro-carbon ferrochrome, 0.5 to 1.5 percent of ferrotitanium, 1.15 to 2.85 percent of fluorite, 0.8 to 2.0 percent of ferrosilicon and 0.6 to 1.5 percent of lithium carbonate. In the invention, the alloy content of deposited metal and the hardness of the surfacing layer are controlled by adjusting the percentage of the flux core in the total weight, the surfacing layer with excellent corrosion resistance and proper hardness is ensured to be obtained, and the service life of the wrapper roller is prolonged. And meanwhile, by controlling all the components in the flux powder of the flux-cored wire and the proportion, the flux-cored wire has excellent welding process performance.

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 present application relates to a kind of small square billet sulfur titanium-containing welding wire steel and its preparation method, belong to the technical field of steelmaking.The converter smelting process, refining process and continuous casting process, specifically are as follows:in the converter smelting process, tapping is carried out using aluminum block, ferrosilicon, silicon manganese deoxidation alloying, pre-slagging is carried out by adding lime, after tapping is finished, the total mass content of FeO and MnO in slag is controlled≤2.5%;In the refining process, lime, calcium carbide and aluminum particles are added for slagging and diffusion deoxidation, after slagging is finished, the slag basicity is controlled to be 2.5~3.0, the total mass content of FeO and MnO in slag is≤0.5%, the total oxygen content of molten steel is≤10ppm, sulfur wire and titanium wire are accurately fed;In the continuous casting process, the inclusion is controlled to gather in the stopper head and the water gap bowl by stopper shaking method, and the basicity of protective slag is controlled to be 0.85~0.95.The sulfur titanium-containing welding wire steel prepared by the above method.The present application solves the problems of small square billet sulfur titanium-containing welding wire steel surface slag inclusion, intermediate crack and water gap nodule.

The invention provides a high-toughness austenitic stainless steel welding rod for 5Ni steel and a preparation method of the high-toughness austenitic stainless steel welding rod. The welding rod comprises a core wire and a coating coated on the surface of the core wire, and based on the total amount of the core wire, the core wire comprises the following components in percentage by mass: less than or equal to 0.09% of C, less than or equal to 0.15% of Si, 1.6-2.5% of Mn, 18.5-20.5% of Cr, 12.5-14.5% of Ni, 2.1-3.2% of Mo and 0.06-0.18% of Ti; 0.12-0.24% of Al, less than or equal to 0.007% of S, less than or equal to 0.008% of P, less than or equal to 0.006% of O, less than or equal to 0.001% of H, less than or equal to 0.012% of S + P, and the balance Fe and inevitable impurities. On the basis of the total amount of the coating, the coating comprises, by mass, 28-38% of carbonate, 15-20% of fluorite, 1-3% of lithium fluoride and sodium fluoride, 8-12% of synthetic mica, 3-6% of potassium silicotitanate, 2-4% of zircon sand, 9-15% of electrolytic manganese metal, 2-4% of ferrotitanium, 2-5% of passivated nickel-magnesium alloy, 1-3% of atomized ferrosilicon, 1-3% of lanthanum cerium fluoride, 1-3% of tungsten and molybdenum, 3-5% of nitrided ferrochromium and 1-2% of CMC. The welding rod is good in all-position welding controllability, extremely low in air hole sensitivity and excellent in low-temperature toughness, and can meet the requirements for high-quality and efficient welding of 5Ni steel.

The invention discloses an ultralow-temperature high-toughness non-magnetic steel flux-cored wire for a controllable nuclear fusion device and a preparation method of the ultralow-temperature high-toughness non-magnetic steel flux-cored wire. A special stainless steel strip is adopted to wrap a metal powder type flux core, and the flux core accounts for 29.6%-30.4% of the total mass of the flux-cored wire; the flux core comprises the following components: 14%-18% of electrolytic manganese, 21%-23% of chromium metal, 0.3%-1.0% of ferrotitanium, 4.4%-5.0% of nitrided ferrochromium, 27.5%-28.5% of nickel powder, 0.5%-1.0% of 52 # ferrosilicon, 8%-9% of molybdenum powder, 0.1%-0.3% of lithium fluoride and the balance of atomized iron powder. The problems that an existing non-magnetic steel welding material is insufficient in toughness and high in magnetic conductivity at the ultralow temperature of-269 DEG C are solved by optimizing flux-cored alloy elements of (nickel-chromium-nitrogen) synergistic stable austenite, matching with a manufacturing process of sealed baking and roller die drawing forming of powder at the temperature of 120-140 DEG C and a welding process protected by argon (Ar) with the purity of 99.999%. The AKV2 of a welded joint is larger than or equal to 34J at the temperature of-269 DEG C, the tensile strength is larger than or equal to 620 MPa, the relative permeability is smaller than or equal to 1.02, the problems that nitrogen of an existing solid welding wire is difficult to control, and hardening is easy can be solved, and the welding wire is completely matched with the extreme working condition of a controllable nuclear fusion device.

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 invention relates to a method and a system for preparing trichlorosilane from ferrosilicon, the method comprises the following steps: taking ferrosilicon, silicon tetrachloride and hydrogen as raw materials, fully reacting in a fluidized bed reactor to obtain trichlorosilane and FeSiy alloy, xlt; 40). The system comprises a fluidized bed reactor (200), a cyclone separator (300), a washing tower (400), a gas-liquid separator (500) and a coarse distillation tower (600). Compared with the prior art, the method has the remarkable characteristics that the silazite is used as a silicon source and is low in cost and easy to obtain, the reaction activity of trichlorosilane and FeSiy generated by reaction of the silazite, silicon tetrachloride and hydrogen is high, the utilization rate of silicon elements in the compound is high, no extra catalyst needs to be added in the co-hydrogenation reaction, meanwhile, the byproduct FeSiy alloy is produced, and the production cost is low.

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 utility model provides a magnesium metal vacuum smelting furnace which comprises a tank body and a tank cover, a crucible and a splash-proof cover are arranged in the tank body, and a liquid ferrosilicon heat preservation input mechanism, a residue siphon discharging mechanism and a residual iron discharging mechanism are arranged at the bottom of the tank body. The liquid silicon iron heat preservation input mechanism comprises a liquid silicon iron built-in channel which is arranged upwards from the bottom of the crucible and a silicon iron heat preservation conveying pipeline which is arranged at the bottom of the tank body; the residue siphon discharging mechanism comprises a residue discharging built-in channel arranged upwards from the bottom of the crucible and a residue siphon discharging pipeline arranged on the outer side of the bottom of the tank body, a transparent viewing opening is formed in the pipe wall of the residue siphon discharging pipeline, and a cover body is arranged at an end opening of the residue siphon discharging pipeline; and the residual iron discharging mechanism is connected with the bottom of the tank body. According to the utility model, a liquid ferrosilicon reducing agent can be ensured not to be solidified during input, residues after reduction reaction can be smoothly discharged, and reduced residual iron can be automatically discharged.

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 application 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 thereof. The high-temperature-resistant flux-cored wire containing rare earth elements comprises a wire sheath and a core; the core comprises the following raw materials: dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, aluminiferous iron, potassium cryolite, potassium titanate, sodium titanate, iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, chromium-iron nitride, bismuth oxide, an additive, and the balance of reduced iron powder; the additive is a mixture of zirconium-iron alloy, ferrotitanium alloy and aluminum-magnesium alloy. The application introduces a specific alloy additive into the core to protect the transition of the rare earth yttrium, optimizes the welding performance of the yttrium and multiple components in cooperation, matches the 253MA heat-resistant steel, adjusts the components of the molten slag and the electric arc, and reasonably processes the technology, so that the welding quality of the wire is improved.

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 invention discloses an industrial silicon, silicon iron and silicon series iron alloy totally-closed ore-smelting electric furnace, and relates to the technical field of ore-smelting electric furnaces, the industrial silicon, silicon iron and silicon series iron alloy totally-closed ore-smelting electric furnace comprises a closed furnace body, a power supply system, a water cooling system and a feeding system, the closed furnace body is installed on a base, and a top platform is fixedly connected to the top of a base layer and located above the closed furnace body; a smoke hood is placed on the top of the closed furnace body, the smoke hood and the closed furnace body are sealed through a second fine sand filler (sand seal) or (air seal), the sealing performance between the closed furnace body and the smoke hood is ensured, and furnace gas leakage is prevented. The sealing device can prevent smoke or coal gas in the furnace from overflowing when the electrode holder moves up and down, the sealing device can move along with the adjustment of the diameter of the electrode center circle, and a lifting point fixedly installed at the top of the smoke hood is hung at the bottom of the top platform through a lifting appliance.

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.