239 results about "Pig iron" patented technology

The invention belongs to the field of metal materials, and provides a hard alloy wear-resistant steel ball suitable for mine ore grinding and a preparation method thereof.The hard alloy wear-resistant steel ball is prepared from waste steel pig iron as a basic raw material and chemical components including 2.1%-2.2% of C, 9.8%-10.0% of Cr, 0.10%-0.20% of V and 0.03%-0.06% of Ti; a core-shell precipitated phase microstructure design with MN / MCN as a hard core and chromium carbonitride as a gradient self-passivation shell layer is formed through medium-frequency induction furnace smelting, controlled nitrogen introduction establishment of a V-Ti-C-N microalloy system, bottom pouring solidification and austenitizing quenching and tempering heat treatment processes, and the performance indexes that the surface hardness is HRC60-63 and the core hardness is HRC54-58 are achieved; the average particle size of a core-shell precipitated phase is in dispersed distribution of 20-200nm, the shell thickness is 5-50nm, and the alloy steel ball has excellent wear resistance and corrosion resistance under the high-impact and high-wear working conditions of wet ore grinding, solves the problem of insufficient wear resistance and corrosion resistance of a traditional alloy steel ball, and has wide mine ore grinding application value.

The invention provides a nodular cast iron material and a preparation method and application thereof. The preparation method of the nodular cast iron material comprises the following steps that S1, a mixture of pig iron, low-manganese waste steel and foundry returns is heated to be completely molten, alloy and auxiliary materials are supplemented and adjusted to target components, and base iron is obtained; s2, a spheroidizing agent is added into the base iron to conduct spheroidizing treatment, ladle-to-ladle inoculation is conducted after spheroidizing treatment, and an efficient inoculant is added during ladle-to-ladle inoculation; s3, pouring is conducted, and during pouring, a long-acting stream inoculant is added for instantaneous inoculation; and S4, carrying out vibration aging treatment to obtain the nodular cast iron material. According to the nodular cast iron material, collaborative upgrading is achieved in the three dimensions of graphite form-matrix strength-thermal stress dissipation, in a bench test, the number of hot cracks is greatly increased, the service life is obviously prolonged, and reliable guarantee is provided for braking safety of heavy vehicles.

The invention relates to a method for optimizing a pig iron desulfurization process (1), wherein the pig iron desulfurization process (1) is carried out by dispensing one or more desulfurization agents (2, 3, 4) into a pig iron ladle (5) or a torpedo car, wherein a plurality of treatment patterns are available which differ with respect to the type of desulfurization agents (2, 3, 4) dispensed. The optimization is based on creating a separate model (8) for each of the plurality of treatment patterns in order to optimize the added amounts of the desulfurization agents (2, 3, 4) for the associated treatment pattern, and training (9) the created separate models (8) for each of the plurality of treatment patterns after a predefined number of performed pig iron desulfurization processes (1) with the corresponding treatment pattern. Future pig iron desulfurization processes (1) are optimized on the basis of the predictions of the separate models (8), wherein the optimization determines a treatment pattern and the added amounts of the desulfurization agents (2, 3, 4) for the treatment pattern by means of a comparison of the predictions of the separate models (8). The invention also relates to a system and a computer program which are designed to carry out the method according to the invention.

The invention provides a smelting method of vanadium-titanium-iron minerals, which comprises the following steps: carrying out reduction roasting on the vanadium-titanium-iron minerals by using a reducing agent to obtain a metallized material; and the metallized material and a slag former are smelted, the slag former comprises sodium salt, and vanadium-containing pig iron and active titanium slag are obtained after smelting is finished. According to the smelting method provided by the invention, a two-step smelting process of pre-reduction and sodium modification smelting is adopted for the vanadium-titanium-iron minerals, so that efficient separation of titanium and iron vanadium is realized, and vanadium-containing pig iron and titanium slag with high additional values are obtained. The titanium slag is high in grade, good in activity and high in acidolysis rate, and the problems that ferrovanadium and the titanium slag are difficult to separate in the vanadium-titanium-iron mineral smelting process, and the titanium slag is poor in activity, low in acidolysis rate and incapable of being economically utilized are solved.

A production method of pig iron using a blast furnace with a tuyere includes: charging a first layer containing an iron ore material and a second layer containing coke alternately in the blast furnace; and reducing and melting the iron ore material in the charged first layer while injecting an auxiliary reductant into the blast furnace by hot air blown from the tuyere, in which: an aggregate for letting through the hot air to a central portion of the blast furnace is blended into the first layer; and the aggregate contains a reduced iron molded product obtained through compression molding of reduced iron.

The invention relates to a thick and large-section nodular cast iron inoculation method based on a laminated slow-release inoculation block. The method comprises the following treatment steps that S1, raw materials are prepared; s2, the high-purity pig iron, the waste steel and the nodular cast iron foundry returns in the step S1 are put into an electric induction furnace to be smelted; s3, performing carbon and silicon testing on the molten iron subjected to slag removal in the step S2 by using a carbon and silicon analyzer, and adjusting components; s4, carrying out primary spheroidizing inoculation by adopting a pouring method; and S5, after spheroidizing inoculation is completed, molten iron is poured into a sand mold, a laminated slow-release inoculation block is placed in the sand mold for slow-release inoculation, and a thick and large-section spheroidal graphite cast iron casting is formed. The method has the advantages that slow-release inoculation is implemented in the cross gate, and molten iron continuously and slowly releases an inoculant in the pouring process through the laminated slow-release inoculation blocks. By means of the method, inoculation recession can be effectively inhibited, the graphite form is improved, and finally the density and the spheroidization rate of graphite nodules in the center of the thick and large-section nodular iron casting are increased.

The invention provides high-phosphorus wear-resistant gray cast iron and a production method thereof, and belongs to the technical field of high-phosphorus wear-resistant gray cast irons.The production method comprises the following steps that raw materials are inspected; smelting is conducted, specifically, waste steel, gray iron foundry returns, pig iron, a carburant and ferrophosphorus are sequentially put into an electric furnace to be melted; nickel, chromium and copper are sequentially added into the electric furnace, and the molten iron is quenched and tempered, so that the final components of the molten iron meet the requirements; molding: preparing a casting mold; a casting ladle is preheated, meanwhile, an inoculant is placed at the bottom of the casting ladle, then molten iron is poured into the casting ladle, and the inoculant is added along with flow in the process that the casting ladle conducts casting into the mold; box opening: the box is opened after the temperature is reduced, and the formed high-phosphorus wear-resistant gray cast iron is obtained; and performing heat treatment: performing high-temperature annealing on the high-phosphorus wear-resistant gray cast iron, and inspecting the casting to obtain a final finished product. According to the technical scheme, the purpose of improving the abrasion resistance and the mechanical performance of the gray cast iron is achieved.

To provide a slag discharging apparatus and a slag discharging method that allow acquisition of a removal amount of slag independently of slag properties.SOLUTION: A slag discharging apparatus (1) specifies a position of a scraping plate (21) as a first region from a first captured image in which a molten pig iron surface (70) in a container (11) is imaged, identifies a second region having brightness equal to or greater than a predetermined first threshold on a movement direction side of the scraping plate (21) from the first region, and calculates a removal amount of slag to be removed, based on an area of the second region.SELECTED DRAWING: Figure 1

The invention relates to the technical field of solid waste harmless and recycling equipment, in particular to a gradient temperature pyrolysis-melting vitrification integrated treatment device and process for red mud. According to the device, an electromagnetic heating rotary kiln pyrolysis section and an electrode melting section are directly coupled with a material transfer device through high-temperature atmosphere isolation. The process comprises the following steps: granulating red mud, a reducing agent and a flux, feeding into a rotary kiln of which the temperature is accurately controlled by multiple groups of electromagnetic induction coils in a partitioned manner, and sequentially completing dehydration, selective reduction and iron particle polymerization to produce gt; high-temperature pyrolysis slag at 1000 DEG C; the pyrolysis slag directly falls into an electric melting pool to complete melting and iron-slag liquid phase separation under absolute isolation of reducing atmosphere and oxidizing atmosphere by the device, and pig iron and a stable glass body are respectively obtained. Through the design of'hot slag direct melting 'and'energy closed loop', the problems of high energy consumption and complex flow of the traditional process are solved, and efficient recovery of iron resources in the red mud and thorough harmless and high-valued utilization of the residues are 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 discloses high-strength wear-resistant wind power ductile iron and a processing technology thereof, and belongs to the technical field of casting. The processing technology of the high-strength wear-resistant wind power ductile iron comprises the following steps: A1, sequentially adding waste steel, a carburant, pig iron, foundry returns and ferroniobium into an intermediate frequency furnace, standing after all furnace charges are molten, and removing slag; a2, a spheroidizing agent, a nucleating agent, metal antimony, titanium carbide and a covering agent are sequentially added to the bottom of a steel ladle, and then molten iron in the step A1 is poured into the steel ladle for spheroidizing and inoculation; a3, the molten iron obtained after spheroidizing and inoculation is subjected to slagging-off and then poured into a casting mold, and a stream inoculant is added in the pouring process; a4, after pouring is finished, slowly cooling in the sand mold to below 400 DEG C, and removing a casting from the casting mold; and A5, the casting is subjected to pulse current quenching treatment and then subjected to pulse current normalizing treatment, and the high-strength wear-resistant wind power ductile iron is obtained. The prepared high-strength wear-resistant wind power ductile iron is high in strength and good in wear resistance, and the low-temperature impact performance meets the requirement of QT500-14AL.

The invention relates to a method for measuring and analyzing nickel, silicon and phosphorus in nickel-containing pig iron, in particular to the technical field of detection and analys.The measuring and analyzing method comprises the steps that a nickel-containing pig iron sample is drilled, sampled and separated through a hard alloy drill bit, and a test sample is obtained; sequentially carrying out acid dissolution, solid-liquid separation and constant volume on the obtained test sample to obtain a test solution; measuring the contents of nickel, silicon and phosphorus in the obtained test solution by adopting a full-spectrum direct-reading inductively coupled plasma emission spectrum; a standard curve used in the full-spectrum direct-reading inductively coupled plasma emission spectrum measurement is obtained by dissolving a gradient nickel-containing pig iron standard sample to a constant volume. According to the determination and analysis method provided by the invention, the detection process is designed, so that the nickel, silicon and phosphorus elements in the nickel-containing pig iron with the nickel content of 8-15% can be jointly determined, and a scientific data basis is provided for production management and control.

The regenerated pig iron screening device comprises a grading screening machine box, a pretreatment box and a coarse screening assembly, a feeding mechanism is installed on the top of the side face of the grading screening machine box, and the pretreatment box is placed on the side face, close to the feeding mechanism, of the grading screening machine box and located below the feeding mechanism. The coarse screening assembly is arranged in an inner cavity of the top of the pretreatment box, an inclined guide plate is arranged below the coarse screening assembly, the outer surface of the inclined guide plate and the inner surface of the bottom of the pretreatment box are fixedly installed, a collecting box is fixedly installed on the side face, away from the feeding sleeve and the discharging sleeve, of the pretreatment box, and a vertical spiral feeding machine is fixedly installed on the side face of the collecting box. The raw materials are pretreated through the coarse screening assembly, the feeding granularity range of the raw materials entering the grading screening machine box to be screened is adjusted to a certain degree, the follow-up refining effect and efficiency are improved, and the interference problem of large-particle raw materials on small-particle raw materials is solved.

The invention relates to the technical field of nodular cast iron, in particular to a preparation method of high-strength and high-toughness nodular cast iron, which comprises the following steps: weighing the following basic raw materials in percentage by mass: 48-52% of pig iron, 28-32% of scrap steel, 18-22% of foundry returns, 0.002-0.008% of antimony and 0.015-0.025% of copper, smelting, transferring into a nodulizing bag, and adding an Mg-Ce-Y composite nodulizing agent and an inoculant for inoculation; and after inoculation is completed, casting is conducted, and a casting is fed into a resistance furnace to be subjected to normalizing, quenching and tempering treatment. The mechanical property combination that the tensile strength is larger than or equal to 800 MPa and the ductility is larger than or equal to 10% is achieved.

The invention relates to the technical field of metal product preparation, and discloses a manufacturing process of a high-strength wear-resistant alloy cast iron pan, which comprises the following steps: respectively carrying out magnetic separation impurity removal on a basic raw material and titanium powder, then carrying out vacuum roasting, cooling and discharging to respectively obtain pre-treated pig iron, pre-treated carbon steel and pre-treated titanium powder; preheating an induction furnace, adding the pretreated pig iron, and raising the furnace temperature until the pretreated pig iron is completely molten; then adding the pretreated carbon steel and the reinforced alloy, starting electromagnetic stirring, then adding the pretreated titanium powder, and continuously stirring after adding to obtain a melt; a composite inoculant is added into the melt and stirred, then molten iron is poured into a heat preservation launder for pouring, demolding is conducted after heat preservation, and a pot blank is obtained; the pot bottom and the pot body of the pot blank are subjected to partitioned cooling, then overall cooling and vibration aging treatment are conducted, and then natural cooling is conducted to the room temperature; and after the cooled pan blank is ground and polished, the pan blank is coated with a composite ceramic coating, and the high-strength wear-resistant alloy cast iron pan is obtained.

The present application belongs to the technical field of aluminum electrolysis production, and provides a phosphorus pig iron recarburization and desulfurization additive and a production process. The additive raw material comprises graphite powder, passivated magnesium, calcium oxide, silicon iron powder, manganese iron powder, phosphorus iron powder, sodium carbonate and a binder. The additive has a four-layer structure, the passivated magnesium is wrapped inside the calcium oxide, and the graphite powder wraps the calcium oxide inside. When used, the graphite powder dissolves in the phosphorus pig iron water, the calcium oxide is gradually released to perform preliminary desulfurization, and after the calcium oxide reaction is completed, the passivated magnesium wrapped inside the calcium oxide is gradually released to perform further desulfurization. This gradual release method is beneficial to promoting the reaction while avoiding the one-time reaction of the passivated magnesium to release a large amount of heat to cause disturbance of the iron water and eliminate safety hazards. The additive has moderate particle size, good absorption effect when used, and simple production process, and can effectively meet the recarburization and desulfurization needs of the phosphorus pig iron.

This invention discloses a monitoring system and method for blast furnace hearth slag and iron storage. The system includes a raw material system, a slag and iron system, a processing system, and an early warning system. The method includes determining the chemical composition of the raw materials; establishing a charging procedure during the blast furnace charging process, recording the probe's action time and batch weight; determining the tapping speed and weight; determining the slag tapping speed and weight; performing chemical testing on the molten iron and slag; filtering and processing the data fed back from the raw material and slag and iron systems; and providing graded early warnings for the data in the processing system, issuing warnings to front-line operators, and providing furnace operation signals and raw material warning signals. This invention calculates the theoretical pig iron and theoretical pig slag production of the blast furnace and provides early warnings for the blast furnace raw material and slag and iron systems. This invention can effectively reflect the slag and iron storage in the hearth and is of great significance for guiding furnace operations.

This invention discloses a method for preparing battery-grade nickel sulfate and iron phosphate using nickel pig iron and ferric phosphate slag as raw materials. The preparation process involves first mixing the ferric phosphate slag with cationic alkyl polyacrylamide to form a uniform mixture. This mixture is then added to dilute acid and stirred to disperse it. Nickel pig iron powder is added, and the mixture is filtered to obtain a leaching solution. The leaching solution is then subjected to nickel-iron separation using resin to obtain an iron-containing solution and a nickel-containing resin. The nickel-containing resin is desorbed to obtain a desorbed solution. A nickel-based pH adjuster is added to this desorbed solution, and the solution is filtered to obtain a nickel sulfate solution. After evaporation and concentration to precipitate crystals, the solution is dried and crushed to obtain battery-grade nickel sulfate. Hydrogen peroxide is added to the iron-containing solution to oxidize ferrous iron to ferric iron. A phosphorus source is added, the pH is adjusted, and the solution is reacted, filtered, and dried to obtain iron phosphate dihydrate. This is then calcined to obtain battery-grade iron phosphate. This invention uses nickel pig iron and ferrophosphate slag as raw materials, and utilizes the ferrophosphate slag to promote the full leaching of iron from nickel pig iron, and nickel pig iron to promote the leaching of phosphate and iron from ferrophosphate. With the addition of cationic alkyl polyacrylamide, it achieves high leaching rates of iron and nickel in a short time, and simultaneously achieves the separation of non-ferrous and nickel metal ions during the acid leaching process, so as to finally obtain high-purity, qualified battery-grade nickel sulfate and ferrophosphate.

The invention discloses a nodular cast iron material with a thick and large section and a preparation method thereof. The nodular cast iron material is mainly prepared from the following raw materials: 35-50% of pig iron, 30-50% of scrap steel and 0-30% of foundry returns. And the carburant accounts for 0.45%-0.9% of the total amount of the pig iron, the scrap steel and the foundry returns. According to the technical scheme, on one hand, the silicon content is increased, and on the other hand, all alloy elements in the molten iron are subjected to specific proportion regulation and control, such as carbon (C), manganese (Mn) and other main elements and magnesium (Mg) auxiliary elements; through the adjustment, the nodular cast iron material with the thick and large section has good basic mechanical properties, the prepared as-cast nodular cast iron with the thick and large section is ferrite nodular cast iron, the tensile strength Rm of the as-cast nodular cast iron is larger than or equal to 650 MPa, the Rp yield strength is larger than or equal to 500 MPa, and the elongation A is larger than or equal to 7%.

Disclosed is a method for producing steel, ferrous alloys or pig iron, and a melting furnace installation, which use ammonia.

The invention belongs to the technical field of ferrous metallurgy, and particularly discloses a smelting method of high-harmful-element sefstromite, which provides a basis for stable smelting of a blast furnace by determining key indexes of raw materials and fuels, integrating that the grade of ore entering a furnace is greater than 55%, the thermal reactivity of coke is less than 45% and the strength after reaction is greater than 48%, and setting a reasonable smelting parameter range. And the characteristics of local high-harmful-element sefstromite can be handled. The problems that the content of harmful elements in local ore is high, ore blending before iron making and production stability are negatively affected, and the pig iron smelting cost is increased are solved. By utilizing the advantage of low cost and matching with a pre-ironmaking sintered ore batching mode and a pellet batching mode, airflow in a blast furnace is stable and reasonable in distribution, a hearth keeps uniform and active, long-period stable and smooth operation of the blast furnace is realized, the ore and coke blending cost is greatly reduced, and the cost of each ton of molten iron is reduced.

The application discloses an oil well pump of high-speed steel containing aluminum and boron and a preparation method thereof, and belongs to the technical field of metal materials. The preparation method comprises the following steps: taking pure iron, micro-carbon chromium iron, tungsten iron, boron iron, pig iron, vanadium iron, titanium iron and aluminum wire as raw materials, and obtaining high-speed steel melt through vacuum induction melting; graphite mold casting is carried out at 1400-1440 DEG C to obtain a cast blank; the cast blank is sequentially subjected to homogenizing annealing, austenitizing, deep undercooling treatment and tempering heat treatment, and finally the product is obtained. The oil well pump comprises the following chemical components in percentage by weight: Al: 1.06%-1.55%, C: 0.11%-0.25%, B: 1.76%-2.47%, and the microstructure is a tempered martensite matrix and (Fe,Cr)2B hard phase. The product has excellent corrosion resistance, wear resistance and service safety, and the cost is lower than that of traditional materials, can effectively resist downhole corrosion and erosion, prolong the service life of the oil well pump, and is suitable for downhole mining scenes in oil fields.

The invention relates to the technical field of nodular cast iron production, and particularly discloses a high-strength and high-elongation nodular cast iron material and a preparation method thereof. Comprising the following raw materials in percentage by weight: 24%-26% of pig iron, 48%-52% of foundry returns, 0.2% of a pretreating agent, 3.1%-3.4% of carbon, 2.0%-2.8% of silicon, 0.05%-0.3% of manganese, 0.01%-0.05% of phosphorus, 0.005%-0.02% of sulfur, 0.4%-0.7% of copper, 0.001%-0.02% of tin, 0.1%-0.3% of nickel and the balance of waste steel. The nodular cast iron material prepared by the nodular cast iron formula and the preparation method provided by the invention has relatively high ductility and relatively high strength, relatively safe performance and relatively high use value.

The invention relates to a method for passivating a magnesium material, comprising the step of coating the magnesium material with urea, where the magnesium material is magnesium, a magnesium alloy containing at least 50% by weight of magnesium, or a mixture of magnesium and one or more such magnesium alloys, and where the coating is carried out by mixing the magnesium material with urea particles. The invention further relates to a passivated magnesium material, in particular magnesium in the form of particles of a magnesium material, which are coated with a coating containing urea or consisting of urea, which can be obtained by said method, the invention also relates to the use of the passivated magnesium material for producing pyrotechnic, coated welding electrodes, refractory products, cored wires or desulfurizers for the desulfurization of pig iron and / or steel.

The invention relates to the technical field of ferrous metallurgy, in particular to a method for producing sulfur-containing free-cutting steel by taking molten iron desulfurized slag-off iron as a raw material. The method comprises the following steps: S1, pretreating the drossing iron; s2, preparing raw materials; s3, electric furnace smelting treatment; s4, deoxidation alloying and sulfur content regulation and control; and S5, continuous casting forming. According to the method, molten iron desulfurized drossing iron is used as a main raw material to replace part of common pig iron and scrap steel, high-value cyclic utilization of drossing iron resources is achieved, and the raw material cost is reduced by 15%-20%; by controlling the slag content in the drossing iron and the slag alkalinity in the converter slagging process, the influence of slag charge on molten steel components is avoided, the stability of the sulfur content of the molten steel is improved, and the product percent of pass is improved to 98% or above from 85% or below of a traditional method.

The invention discloses an intermediate frequency furnace lining forming method and a steel mold device, and belongs to the technical field of intermediate frequency furnace linings. The method comprises the following steps: polishing the outer wall of a steel mould device, pasting kraft paper, adding furnace lining sand, ramming and vibrating, adding pig iron, heating a hearth, stopping power supply after heat preservation, cooling by using a fan, chilling and shrinking the steel mould device, taking out the steel mould device by using a crown block, selecting a pipe, adding the pig iron, and tamping in a layered manner, power is supplied to the pipe, the demolding furnace lining is indirectly heated to the sintering temperature and cured, the demolding furnace lining is filled with blast furnace molten iron for furnace baking, the molten iron is discharged after furnace baking is completed, and a formed furnace lining is obtained; the method is suitable for intermediate frequency furnace lining forming, and the purposes that the steel mold demolding operation is simple and rapid, the pollution risk of residues to a furnace lining material is reduced, meanwhile, rapid temperature change is avoided, the cracking probability of a furnace bottom material is reduced, the rework rate is reduced, energy consumption is low, and the furnace building cost is saved can be achieved.

The invention provides a composite synergist and an application method thereof, and belongs to the field of composite synergists. The composite synergist provided by the invention comprises the following components in percentage by mass: 15-30% of ferrosilicon, 30-40% of ferrophosphorus, 5-10% of ferromanganese, 30-50% of a carburant and 0-10% of a desulfurizing agent. After the composite synergist provided by the invention is added into to-be-treated molten phosphorus pig iron for treatment, the carbon equivalent of the obtained to-be-cast molten phosphorus pig iron is increased to 4.3%, the percent of pass of the molten iron is increased to 99.2%, the molten iron can be discharged at 1450 DEG C for casting, the percent of pass of a ferrophosphorus ring is increased to 99% from 96.3% in the early stage (traditional process), and the yield of the ferrophosphorus ring is increased to 99%. The composite synergist can improve the liquidity of molten iron and improve the qualification rate of anode casting.

The utility model relates to blast furnace pig iron field, concretely is a kind of blast furnace pulverized coal injection pressure relief system.A kind of blast furnace pulverized coal injection pressure relief system, including injection tank (1) and coal powder bin (2), coal powder bin (2) is located in the side of injection tank (1), still include first pressure relief branch pipe (31), second pressure relief branch pipe (32), bypass pipe (33), main pressure relief pipeline (34), pressure relief cut-off valve (41), regulating valve (42), big pressure relief valve (43), micro pressure relief valve (44), pressure sensor (5) and controller (6), the air inlet of first pressure relief branch pipe (31) is connected the top 1# gas delivery end of injection tank (1), pressure relief cut-off valve (41) and regulating valve (42) are sequentially connected on first pressure relief branch pipe (31), big pressure relief valve (43) is connected in parallel by bypass pipe (33) and regulating valve (42);The air inlet of second pressure relief branch pipe (32) is connected the top 2# gas delivery end of injection tank (1), micro pressure relief valve (44) is connected on second pressure relief branch pipe (32).The utility model is high in efficiency, long in life, protects environment.

The invention relates to a high-aluminum steel smelting and continuous casting process adopting EBT electric arc furnace smelting, LF furnace refining, VD vacuum treatment and CC continuous casting, raw materials comprise pig iron, CrMo steel cuttings, carbon cuttings, high manganese, high chromium, ferromolybdenum, ferrosilicon and aluminum blocks, tapping is carried out after C and P in an electric arc furnace are removed to target values, the aluminum blocks are added into a steel ladle before tapping, the Al content is adjusted in advance, LF furnace deoxidation and alloying treatment are carried out, and the high-aluminum steel is obtained. The temperature is measured after vacuum breaking, sampling is conducted, the weak stirring time is larger than or equal to 15 min after calcium lines are fed, the VD station is switched to the CC station, a water gap of a large ladle is sealed through a long water gap, an overall submersed water gap is adopted for a tundish, molten steel in the tundish is subjected to heat preservation through a carbon-free covering agent and double-layer rice hulls, and an argon blowing stopper rod is adopted for the tundish; annealing treatment is carried out after a continuous casting billet is discharged, the method is suitable for smelting high-aluminum steel through a 60t EBT electric arc furnace, a 60t LF furnace and VOD / VD, and the problem that the Al content is unqualified after VD is solved; ca treatment prevents continuous casting flocculation flow; the molten steel utilization rate is improved through continuous casting production.

The application belongs to the technical field of steelmaking equipment, and discloses a feeding and conveying mechanism of a steelmaking furnace, which comprises a chassis, an annular guide rail conveyor is installed on the chassis, a top plate is fixedly connected to the middle part of the chassis and is located above the annular guide rail conveyor, and two moving seats are slidably arranged on the guide rail of the annular guide rail conveyor. The two moving seats can be driven to move by the operation of the annular guide rail conveyor, and the two supporting seats and the two conveying buckets also move together. The two moving seats are oppositely arranged, so that the two supporting seats and the conveying buckets are oppositely arranged. The two conveying buckets can be sequentially and orderly fed and discharged. When the conveying bucket moves to the left end of the chassis, pig iron can be added into the conveying bucket. Then, the empty conveying bucket is moved to the left end of the chassis by the annular guide rail conveyor. At this time, the other conveying bucket is at the right end of the chassis and is located at the feeding port of the steelmaking furnace.