883 results about "Ferrosilicon" patented technology

Disclosed are a flux-cored welding strip and a welding flux used in combination for submerged arc welding of a duplex stainless steel, and preparation methods and use thereof. The flux-cored welding strip is composed of a stainless steel shell and a flux core powder, the flux core powder consisting of the following components: in percentages by mass, ferrochrome nitride: 0.70% to 1.0%, a chromium powder: 26% to 27%, a nickel powder: 4.5% to 5.5%, a molybdenum powder: 3.7% to 4.2%, a manganese powder: 2.55% to 2.65%, a copper powder: 1.45% to 1.55%, a ferrosilicon powder: 1.1% to 1.2%, a tungsten powder: 1.0% to 1.15%, a niobium powder: 0.25% to 0.35%, an aluminum powder: 0.35% to 0.55%, a rhenium powder: 0.35% to 0.40%, a lanthanum powder: 0.1% to 0.15%, and a balance being an iron powder.

The invention relates to the technical field of welding wire preparation, in particular to a nickel-based alloy flux-cored wire for 9Ni steel welding and a preparation method of the nickel-based alloy flux-cored wire. A nickel-based alloy flux-cored wire for 9Ni steel welding comprises a flux core, and the flux core comprises, by weight, 26%-34% of titanium dioxide, 3%-5% of ferrozirconium, 8%-12% of ferrotitanium, 1%-3% of rare earth ferrosilicon, 15%-20% of tungsten powder, 1%-2% of polytetrafluoroethylene and the balance pretreated mixed powder. The nickel-based alloy flux-cored wire for 9Ni steel welding has the advantages that low-melting-point eutectic is not prone to being formed, the hot crack sensitivity is reduced, the nickel-based alloy flux-cored wire is suitable for welding of restrained large structures, the deoxidation and denitrification capacity is enhanced, and the pore sensitivity is reduced.

The invention discloses a ductile iron dead-head-free casting process which comprises the following steps: S1, a casting mold modeling step: filling cavities of an upper half casting mold and a lower half casting mold with dry mold sand before casting, and arranging a pouring system in the cavities of the upper half casting mold and the lower half casting mold; s2, nodular cast iron smelting, wherein raw materials of nodular cast iron are put into a cupola furnace to be smelted; step S3, spheroidizing and in-ladle inoculation treatment: performing spheroidizing by adopting a dam type flushing method, putting a spheroidizing agent into a ladle pit, tamping, covering the spheroidizing agent with a thin layer of silicon iron and cast iron scraps, performing in-ladle inoculation through an inoculant, and removing scum on the surface of the molten iron after the molten iron reacts stably; s4, pouring is conducted, specifically, the molten iron is poured into a sprue, and stream inoculation is conducted by adding an inoculant in the pouring process; and S5, cooling forming is conducted, specifically, after the casting is cooled and solidified, the casting is taken out, and a sand layer on the surface of the casting is taken out.

The invention relates to a slag charge adding device for smelting low-phosphorus steel through a high-silicon molten iron converter double-slag method, and relates to the technical field of steel-making slag charge adding. The slag charge adding device comprises a base, a converter body is installed on the base, a fixing frame is fixedly connected to the base, a moving assembly is arranged on the fixing frame, a storage barrel is arranged on the moving assembly, and the storage barrel is connected with the converter body. A sorting assembly is arranged below the storage barrel, and the lower portion of the sorting assembly communicates with a spreading disc. The method has the advantages that the slag materials are separated and scattered in different areas according to different sizes, large particles fall into the center position close to the converter body, small particles fall into the area close to the side wall of the converter body, and the temperature of the center position of the converter body is usually the highest area, so that the slag materials are separated; and the high temperature is beneficial for increasing the melting speed of the large-particle slag charge, so that the large-particle slag charge can participate in the chemical reaction of steelmaking more quickly.

The invention relates to the technical field of aluminum alloy material pressure processing, in particular to an aluminum alloy material for preparing a steel-aluminum composite strip and a preparation method thereof.The aluminum alloy material comprises a steel layer and an aluminum alloy layer, and the aluminum alloy layer comprises, by mass, 100 parts of silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), zinc (Zn) and the balance aluminum and inevitable impurity elements. According to the method, through the laser interface activation and ultrasonic-assisted rolling technology, the interface bonding degree and the microstructure of the steel-aluminum composite material are remarkably improved, and the stability of the steel-aluminum composite material at the high temperature is optimized. And microalloying elements such as scandium (Sc) are introduced, so that the mechanical property and the corrosion resistance of the material are enhanced. The service life is prolonged through a special high-temperature-resistant coating and an accurate heat treatment process, and the surface hardness and corrosion resistance are improved. The advanced processes ensure high performance and high quality of the composite material, and meet the requirements of high temperature and special environments.

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.

A high scrap steel ratio steelmaking nitrogen control integration technology is characterized by comprising the steps that pig iron and coke are added into a converter and molten iron, and the bottom blowing strength of the converter is improved; converter sealing and argon protection optimization are carried out, and then silicon iron heating and waste steel treatment are carried out before blowing; the first blowing hit rate is optimized, tapping and deoxidation are controlled, and the nitrogen content of the optimized alloy is detected; transferring into a refining furnace, and adjusting the power transmission heating time and the deoxidation and alloying time; optimizing a low-slag-quantity and low-temperature-period power transmission mode, and controlling the argon flow of the refining furnace; and optimizing slagging at the early stage of refining, controlling a silicon-manganese composite deoxidation and slag system, and controlling argon flow during soft blowing of the refining furnace. According to the technology, the nitrogen removal amount of the converter under the low molten iron unit consumption condition is improved mainly through carbon content supplementation, waste steel size optimization and exothermic agent heat supplementation, and the nitrogen increase of the refining furnace is reduced. According to the integrated nitrogen control process technology, the nitrogen content can be effectively reduced, the investment and application of vacuum degassing equipment are reduced, the process is simplified, and the production cost is reduced.

The invention discloses a high-strength steel welding rod for 1000 MPa water and electricity and a preparation method and application of the high-strength steel welding rod. The invention belongs to the technical field of welding materials. The technical problems that the low-temperature impact toughness of an existing welding material for 1000 MPa-grade high-strength steel needs to be improved, and the welding cold crack sensitive index is too large are solved. The welding rod is composed of a core wire and a coating wrapping the surface of the core wire. Powder of the coating is formed by mixing marble, fluorite, rutile, silica powder, electrolytic manganese, ferrosilicon, graphite, ferromolybdenum, chromium metal, iron powder, nickel powder, sodium carbonate and sodium alginate. The welding rod has the advantages of good all-position welding process performance, stable electric arc, small flying speed, uniform coating melting, beautiful weld joint forming and good operability of welders. And weld metal has good mechanical properties. And the method is used for welding the high-strength steel for the 1000MPa-grade water

The invention discloses a high-strength 7xxx series aluminum alloy capable of being anodized and a preparation method thereof. The high-strength 7xxx series aluminum alloy capable of being anodized comprises the following components: less than 0.07% of silicon, less than or equal to 0.12% of iron, 1.2-1.6% of copper, 0.07-0.17% of manganese, 2.10-2.40% of magnesium, 0.003-0.012% of zirconium, 6.2-6.5% of zinc, less than or equal to 0.003-0.020% of titanium and the balance of aluminum and other inevitable impurity elements. The preparation method of the high-strength 7xxx series aluminum alloy capable of being anodized comprises the steps of smelting and casting, homogenizing treatment, hot extrusion and heat treatment and anodizing treatment. A 7xxx series aluminum alloy product prepared through the preparation method has good intergranular corrosion and exfoliation corrosion performance; according to the alloy performance, the tensile strength is larger than or equal to 480 MPa, the yield strength is larger than or equal to 450 MPa, and the ductility is larger than or equal to 9%; in the grain sizes of the profile, the average grain size is less than or equal to 150 microns, and the maximum grain size is less than or equal to 250 microns; and after anodic oxidation treatment, the polishing glossiness is larger than 450 GU, more obvious advantages are achieved, and the good market prospect is achieved.

The invention belongs to the technical field of rare earth element separation, and particularly relates to a fluidization, separation and enrichment method for rare earth element carrier ore of mine solid waste. Comprising the following steps that a mixture of pulverized coal and ferrosilicon powder serves as a separation medium and is added into a vibration gas-solid separation fluidized bed device, and the vibration frequency, the amplitude parameter and the gas speed of pulse airflow of the vibration gas-solid separation fluidized bed device are set according to the density of mine solid waste rare earth element carrier minerals, the separation granularity and the content of rare earth elements; the mine solid waste rare earth element carrier minerals form a scattered fluidization environment with uniform and stable density under the vibration-airflow synergistic effect of the vibration gas-solid separation fluidized bed, density gradient layering is carried out, and separation and pre-enrichment of rare earth elements in the mine solid waste rare earth element carrier minerals are achieved. According to the method, high-density coal gangue containing high rare earth elements is efficiently and accurately sorted, and the problem of pre-enrichment of the rare earth elements in mine solid waste rare earth element carrier minerals is effectively solved.

The invention aims at disclosing a high-flatness and high-heat-conductivity titanium-aluminum composite plate, a forming process and a heat treatment device, and relates to the technical field of titanium-aluminum composites.The high-flatness and high-heat-conductivity titanium-aluminum composite plate is formed by compositing a TC4 alloy titanium plate with the first thickness and a high-strength aluminum plate with the second thickness; the first thickness accounts for 12%-50% of the total thickness of the composite board, and the total thickness of the composite board is 2.0 mm-7. 5mm; the TC4 alloy titanium plate comprises the following components in percentage by weight: 86 to 89 percent of titanium, 5.5 to 6.8 percent of aluminum and 3.5 to 4.5 percent of vanadium; the high-strength aluminum plate comprises 0.4 wt%-0.8 wt% of silicon, 0.7 wt% of iron, 0.15 wt%-0.4 wt% of copper, 0.15 wt% of manganese, 0.8 wt%-1.2 wt% of magnesium, 0.04 wt%-0.35 wt% of chromium, 0.25 wt% of zinc, 0.15 wt% of titanium and aluminum, and the titanium-aluminum composite plate has the beneficial effects that the thickness of the TC4 alloy titanium plate in the titanium-aluminum composite plate accounts for 12%-50% of the total thickness, that is, the titanium-aluminum composite plate is mainly the high-strength aluminum plate, and due to the fact that the high-strength aluminum plate is lower in density and lower in cost, the titanium-aluminum composite plate can be used for manufacturing the high-strength aluminum plate; the titanium-aluminum composite plate has the advantage in the aspect of cost performance; and clamping a plurality of staggered-surface laminated plates between the first counterweight plate and the second counterweight plate, and carrying out heat treatment to enable the flatness of the composite plate to be 0.5-1mm, so that the composite plate can be used for preparing the high-throughput operation cabinet.

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 provides an ultra-low carbon duplex stainless steel all-position welding flux-cored wire and a welding method thereof.The outer skin of the flux-cored wire is a stainless steel strip, the flux-cored wire is filled with powder, and the powder comprises, by mass, 18-25% of natural rutile, 20-30% of stainless steel powder, 20-30% of stainless steel powder, 20-30% of stainless steel powder and the balance stainless steel powder. 3-5% of sodium titanate; 5-10% of quartz sand; 0.5 to 4 percent of zircon sand; 1-3% of sodium fluoride; 15 to 25 percent of ferromolybdenum; 3-6% of nitrided ferrochrome; 2-4% of electrolytic manganese; 5-8% of nickel powder; 27 to 32 percent of metal chromium; 0.5-2% of magnesium powder; 0.5 to 1.5 percent of bismuth oxide; and 1-4% of silicon iron. The flux-cored wire is used for all-position welding of third-generation duplex stainless steel, welding spatter is small, and weld joint forming is good; the carbon content of a weld joint is extremely low, and through component and welding process control, weld joint metal has strength, plasticity, toughness and corrosion resistance equivalent to those of base metal. And the double requirements of high strength and toughness and high corrosion resistance in the manufacturing fields of submarine pipeline laying, shipbuilding, marine gas field exploitation and the like are ensured.

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 field of metal material casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT800-5, which comprises the following steps: preparing pig iron, waste steel and foundry returns, and using auxiliary materials such as a silicon carbide pretreating agent, a high-temperature graphitization carburant, a rare earth magnesium silicon iron nodulizing agent, a silicon barium nucleating agent and a silicon strontium nucleating agent to prepare the green sand as-cast high-plasticity nodular cast iron QT800-5. The purity and component stability of molten iron are ensured; in the smelting process, purification and adjustment are carried out through temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microscopic structure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation; the final casting has excellent mechanical properties including the tensile strength larger than or equal to 800 MPa, the yield strength larger than or equal to 480 MPa, the elongation larger than or equal to 5% and the matrix pearlite content larger than or equal to 80%. The production process disclosed by the invention is simplified, is suitable for large-scale industrial production, and has a wide application prospect in lightweight application requiring high-strength and high-plasticity materials.

The invention discloses a high-temperature-resistant and corrosion-resistant aluminum alloy material and a preparation process thereof, and relates to the technical field of aluminum alloy materials. The high-temperature-resistant and corrosion-resistant aluminum alloy material is prepared by carrying out micro-arc oxidation treatment on aluminum alloy, carrying out plasma spraying on a corrosion-resistant spray coating and carrying out heat treatment. The aluminum alloy comprises the following raw material components in percentage by weight: 0.05%-0.15% of silicon, 0.1%-0.2% of iron, 1.2%-1.5% of copper, 0.7%-0.9% of manganese, 2.5%-3.8% of magnesium, 10.2%-12.4% of zinc, 0.02%-0.04% of titanium, 0.08%-0.15% of zirconium, 0.2%-0.4% of scandium, 0.5%-0.8% of silicon nitride whiskers, 0.5%-1% of an aluminum-coated graphene material and the balance of aluminum.

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 flux-cored wire with high crack resistance and wear resistance and a preparation method of the flux-cored wire. The flux-cored wire comprises the following flux-cored raw materials in percentage by mass: 6-10% of electrolytic manganese; 28 to 34% of metal chromium; 0.5 to 1.5 percent of ferrotitanium; 1-4% of tungsten powder; 5-9% of nickel powder; 4-8% of 45 # ferrosilicon; 8 to 12% of colloidal graphene; 8-12% of molybdenum powder; and the balance of iron powder. According to the flux-cored wire, C, W, Cr, Mo and other elements are added into the flux core, the proportion of flux core powder is reasonably adjusted, and the flux-cored wire is suitable for surfacing continuous casting rollers, hot rolling rollers, shafts with the working temperature lower than 510 DEG C and sealing faces of medium-temperature and high-pressure stop valves and has the advantages of being high in heap melting speed, good in weldability, high in surface abrasion resistance, low in cost and the like. The hardness value of the steel plate can basically reach 50 HRC, and the steel plate has good crack resistance.

The invention relates to the technical field of ferrous metallurgy, in particular to a smelting method for silicon deoxidation of low-carbon low-silicon aluminum killed steel. The method comprises a converter, an alloy fine adjustment station, RH refining and continuous casting. A strong bottom blowing mode is adopted in the later stage of converter blowing, and high-carbon ferromanganese, a ferrosilicon deoxidizing agent and lime are sequentially added during tapping; and after temperature measurement and sampling in the alloy fine tuning station, the steel ladle is transported to RH refining. And the RH executes different treatment modes according to Si and C components of the alloy fine tuning station, such as oxygen blowing decarburization and desilicication, direct aluminum particle addition alloying or vacuum reserved oxygen decarburization and the like. Through cooperation of silicon pre-deoxidation and aluminum final deoxidation, the oxygen content of RH entering molten steel and consumption of an aluminum deoxidizing agent are reduced, and the cleanliness of the molten steel is improved; different treatment modes shorten the treatment period, reduce the final temperature of the converter, meet the low-carbon and low-silicon requirements, reduce the production cost and improve the production efficiency.

The invention discloses a production method for improving purity of molten steel for nuclear power, which comprises the following steps: smelting in an AOD furnace: in an AOD pre-reduction stage, according to the adding amount calculated by full ferrosilicon pre-reduction, carrying out pre-reduction deoxidation on half of ferrosilicon and half of aluminum ingot, and controlling the alkalinity of pre-reduced slag to be 2.5-3.5; in the AOD reduction stage, 6.5-8.5 kg of first-grade lime per ton of steel, 5-8 kg of special-grade fluorite per ton of steel and 1.5-3.0 kg of aluminum ingots per ton of steel are added for deep deoxidation, and the content of Al in molten steel is controlled to be 0.035%-0.045%. The method has the characteristic of improving the purity of the molten steel on the basis of ultralow carbon content.

The invention relates to the technical field of welding rod preparation, and discloses a steel matched welding rod for a high water head of a pumped storage power station and a production method of the steel matched welding rod. The coating is prepared from the following components in parts by weight: 25.0 to 36.0 parts of calcite, 26.0 to 35.0 parts of calcined fluorite, 3.0 to 6.7 parts of calcined natural rutile, 3.0 to 7.0 parts of quartz sand, 2.5 to 4.0 parts of spray silicon iron, 5.5 to 7.6 parts of nickel powder, 0.5 to 0.8 part of sodium carbonate, 0.3 to 0.6 part of CMC (Carboxymethyl Cellulose), 0.6 to 1.0 part of sodium alginate, 5.0 to 6.3 parts of low-carbon ferromanganese, 9.0 to 11.0 parts of atomized iron powder, 1.8 to 2.6 parts of ferrotitanium, 0.6 to 1.0 part of rare earth fluoride and 0.6 to 1.0 part of zirconium dioxide; the production method comprises the following steps: uniformly mixing the raw materials of the coating according to the ratio, adding the adhesive into the mixture, and uniformly mixing; and the mixture and the core wire are added into a plodder, the coating is prepared on the surface of the core wire, then low-temperature baking and high-temperature baking are conducted, and the welding rod is obtained.

The utility model relates to the technical field of industrial silicon production, in particular to a raw material screening device with a filtering structure, which comprises a rack, a servo motor is arranged on the surface of one side of the rack, a driving belt pulley is arranged at the output end of the servo motor, and a driven belt pulley is arranged on one side of the driving belt pulley. The driving belt wheel and the driven belt wheel are rotationally connected to the surface of one side of the rack through rotating shafts correspondingly. According to the improved raw material screening device with the filtering structure, the problem that impurities and dust in raw materials spread in the screening process is effectively avoided while feeding is facilitated through the structure of the screening barrel, and a rocker rotates along the surface circumference of a belt wheel to drive the screening barrel to push front and back; the supporting performance and stability of the screening barrel in the reciprocating motion are guaranteed through the corresponding structures among the tension spring, the movable support and the rack, the purpose of split-flow screening is achieved through the structure of the split-flow opening, the purpose of classified machining is achieved, and the overall production efficiency and the silicon iron quality are improved.

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

The invention relates to the field of comprehensive utilization of resources, and discloses a method for comprehensively utilizing high-iron bauxite, which comprises the following steps of: grinding the high-iron bauxite into fine ore, and uniformly mixing the fine ore with a binder and water to form pellets; drying the made pellets at the temperature of 200-300 DEG C until the water content is below 1%; the dried pellets are added into an electric arc furnace and heated to 1500-1600 DEG C for melting, a molten pool is formed, hydrogen is introduced into the molten pool, and molten iron and slag are generated; the molten iron is used for steelmaking or made into castings, and the slag is used for separating and extracting Al2O3, Fe2O3 and SiO2 after water quenching. The high-iron bauxite is reduced through hydrogen, CO2 is not generated, carbon pollution is avoided, after iron is extracted, slag is subjected to water quenching, aluminum, silicon, iron and other components are separated and extracted, various components in the high-iron bauxite can be fully recycled, the recovery rate is high, the comprehensive utilization degree is high, and waste is little.

The invention provides a high-hardness crack-free flux-cored wire and a preparation method thereof.The flux-cored wire comprises an outer skin and a flux core, and the flux core comprises, by weight, 5.6-8.6 parts of boron carbide; 3.1 to 4.6 parts of 75% silicon iron; 0.6 to 1.6 parts of electrolytic manganese; 0.3 to 1.2 parts of 80% ferrovanadium; 0.3 to 1.0 part of nickel powder; 67.5 to 94.5 parts of 68% high carbon ferro-chrome; 6 to 6.5 parts of iron powder; the preparation method of the flux-cored wire comprises the steps that boron carbide, 75% ferrosilicon, electrolytic manganese, 80% ferrovanadium, nickel powder, 68% high-carbon ferrochrome and iron powder are sequentially added into a drying machine according to the formula to be dried for 2-3 h, then a three-dimensional motion mixing machine is adopted for fully and evenly mixing, and then the mixture is put into a heat preservation box to be subjected to heat preservation for use; the outer skin is placed on a forming machine, and an outer skin steel belt is rolled into a U-shaped groove through the forming machine; flux core powder is added into the U-shaped groove, a forming machine rolls and closes the U-shaped groove and draws the U-shaped groove, and the flux-cored wire is obtained; the flux-cored wire has the advantages of being high in hardness, free of cracks, resistant to high temperature and corrosion, low in production cost and beneficial to industrial production.

The invention discloses a submerged nozzle lining material for rare earth steel continuous casting and a preparation method thereof, and relates to the field of refractory materials. The high-strength wear-resistant ceramic material comprises the following components in percentage by weight: 40-65 wt% of fused white corundum, 8-20 wt% of quartz, 15-25 wt% of crystalline flake graphite, 1-2 wt% of metal silicon powder, 2-4 wt% of ferro-silicon nitride powder, 0.5-1 wt% of boron carbide powder and 8-12 wt% of thermosetting phenolic resin. The method has the beneficial effects that the raw materials are processed through the processes of mixing, drying and the like to prepare the pug, the pug is used for manufacturing the submersed nozzle lining, the submersed nozzle using the lining is used for rare earth steel pouring, the nodulation problem of an inner hole of the nozzle is remarkably relieved, the content of inclusions in molten steel is reduced, the quality of steel billets is improved, and meanwhile the production cost is reduced. And the service life of the submersed nozzle is prolonged, so that the submersed nozzle is more suitable for production of rare earth steel protective pouring.

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 field of casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT450-18, which comprises the following steps of: preparing pig iron, waste steel and foundry returns according to a certain proportion, and preparing the green sand as-cast high-plasticity nodular cast iron QT450-18 by using auxiliary materials such as a silicon carbide pretreatment agent, a high-temperature graphitization carburant, a rare-earth magnesium silicon iron nodulizer, a silicon barium inoculant and a silicon strontium inoculant. And purity and component stability of molten iron are ensured. In the smelting process, purification and adjustment are carried out through accurate temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microstructure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation. The final casting has excellent mechanical properties, including tensile strength greater than or equal to 440 MPa, yield strength greater than or equal to 300 MPa, elongation greater than or equal to 16%, and V-shaped notch normal temperature impact absorption energy greater than or equal to 8 J. The method is simple and convenient to operate, high in production efficiency and suitable for large-scale industrial production.

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.