471 results about "Bloomery" patented technology

The invention discloses a method for low-carbon preparation of a high-reactivity blast furnace burden from magnetite concentrate and the blast furnace burden, and belongs to the technical field of ferrous metallurgy. According to the method, an iron-containing raw material, an organic-inorganic composite binder, a multifunctional additive and water are sequentially subjected to uniform mixing, high-pressure double-roller forming and consolidation, and the finished product cold pressing block is obtained. According to the method, the strength and reducibility of the cold pressing block can be remarkably improved by optimizing the particle size composition of the raw materials and adding the multifunctional additive, the technological process is simple, a high-temperature process is not needed, and carbon emission is low.

The invention provides a metallurgical chemical solid waste pretreatment vertical electric heating roasting furnace device and a using method thereof.The furnace body is of a hollow cylindrical vertical structure, a barrel is divided into a solid reduction area, an oxidation reduction area and a furnace charge preheating area, the barrel of the solid reduction area and the barrel of the oxidation reduction area are surrounded by flat rectangular red copper pipes, and an auxiliary induction bar is arranged in the center of the barrel; and the feeding and discharging device is connected to the PLC automatic control module. The power supply control and heat supply device is connected with the red copper pipe through a silicon controlled rectifier medium-frequency power supply, and an air supply and exhaust device, a temperature control device and a sealing device are additionally arranged. Fossil fuel is replaced by electric heating, carbon emission is reduced, environmental protection is achieved, temperature control is accurate, heat efficiency is high, and energy consumption and cost can be saved. One set of equipment is suitable for different solid waste raw materials, pretreated products are obtained through different roasting methods, the equipment is simple, investment is saved, the technological process is short, applicability is high, heating is even through the structural design, sealing is good, continuous production can be achieved, and heat efficiency and production efficiency are improved.

The invention discloses a preparation method of an iron-containing furnace charge for a blast furnace. The method comprises the following steps: uniformly mixing an iron-containing raw material with a bonde-1 (containing an organic polymer binder, an active calcium-based substance and an active iron-based substance), then adding a bonde-2 (containing silica sol and water glass) and water, and further uniformly mixing to obtain a mixture; carrying out compression molding on the mixture to obtain a wet block mass; and drying and solidifying the wet block mass to obtain the iron-containing furnace charge. According to the method, by using the special multifunctional binder, efficient forming, rapid consolidation and clean low-carbon preparation of the blast furnace burden from the iron-containing burden can be achieved, the obtained blast furnace burden meets the performance requirements of the blast furnace burden, and the method has important practical significance for achieving the double-carbon strategy in the iron and steel industry.

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 discloses a method for preparing reduced iron through low-carbon agglomeration-hydrogen reduction of an iron-containing raw material, and belongs to the technical field of ferrous metallurgy. The method comprises the following steps: uniformly mixing an iron-containing raw material with a composite binder and water to obtain a mixture; the mixture is sequentially subjected to homogenization treatment, high-pressure forming and drying solidification, and cold-pressed pellets are obtained; and the cold-pressed pellets are subjected to hydrogen reduction, and metallized pellets are obtained. The method can be used at a lower temperature (lt; according to the method, the furnace burden suitable for direct hydrogen reduction of the shaft furnace is prepared at the temperature of 300 DEG C, the metallized pellets are obtained through further direct hydrogen reduction, the technological process is short, the carbon emission in the reduction process is greatly reduced through hydrogen reduction, and the obtained metallized pellets can be used for different scenes such as converter steelmaking and electric furnace steelmaking according to different qualities.

The invention relates to the technical field of metallurgical furnace charge conveying and control, and discloses a top-blown furnace multi-channel supersonic jet type feeding control method and system.The method comprises the steps that flow distribution in a nozzle is achieved through a piezoelectric ceramic high-speed valve installed at a pipeline inlet, and a nozzle servo motor is controlled at the top of a spray gun to adjust the spray angle of the spray gun; the feeding speed, pressure and temperature are monitored in real time through a pressure sensor and a flow sensor arranged in an inlet area of the pipeline and an infrared thermometer mounted at the top of the furnace; the carrier gas flow, the nozzle opening degree and the spraying angle are dynamically adjusted through control of the PLC executing mechanism, and collaborative optimization of the material flow vector, the flow field in the hearth and the heat and mass transfer process is achieved. The system comprises a spray gun, a piezoelectric ceramic high-speed valve, a flow sensor, an infrared thermometer, a nozzle control servo motor, a temperature measurement control small servo motor and a control room. The comprehensive operation efficiency of energy density distribution optimization, reaction efficiency improvement and energy consumption index reduction of the molten pool reactor is finally realized.

This invention discloses a method for preparing high-reactivity blast furnace charge from magnetite concentrate with low carbon content, and the blast furnace charge itself, belonging to the field of iron and steel metallurgical technology. The method involves sequentially mixing iron-containing raw materials with an organic-inorganic composite binder, multifunctional additives, and water, followed by high-pressure roller molding and solidification to obtain the finished cold-pressed briquettes. By optimizing the particle size distribution of the raw materials and adding multifunctional additives, this method can significantly improve the strength and reducibility of the cold-pressed briquettes. The process is simple, requires no high-temperature treatment, and has low carbon emissions.

The invention relates to the field of ultra-high-temperature smelting furnace temperature control systems, and discloses an ultra-high-temperature smelting furnace temperature control system based on a modular thermal field, which comprises a smelting furnace body used for accommodating raw materials and providing an ultra-high-temperature reaction environment of 1800-2200 DEG C; the modularized thermal field unit is fixed on the inner side of the smelting furnace body and comprises a plurality of standardized and interchangeable thermal field modules, and a lining of each thermal field module is made of a gradient composite ultra-high-temperature ceramic refractory material; the intelligent temperature control system comprises high temperature sensor modules which are arranged in all thermotechnical areas and used for collecting temperature, current and furnace charge data in real time; a data acquisition and preprocessing module, a machine learning control module and an execution module; a fail-safe module; and a man-machine interaction module. Compared with the prior art, the system has the advantages that through combination of modular thermal field design, gradient composite refractory materials, machine learning intelligent control and multi-physical field simulation, accurate, stable, efficient and safe control over the high-temperature smelting process is achieved.

The invention discloses an energy-saving and emission-reducing production method and device for a blast furnace, a medium and electronic equipment.The method comprises the steps that furnace charge information of original furnace charge to be fed into the furnace is obtained, and the furnace charge information is used for indicating furnace charge components of the original furnace charge; target production operation meeting the production requirements of the blast furnace is predicted based on the furnace charge information through the trained prediction model, and the production requirements comprise the steps of controlling the energy consumption of the blast furnace to be minimized and controlling the carbon emission of the blast furnace to be minimized. The prediction model constructs a quantitative relation between energy consumption and production operation and a quantitative relation between carbon emission and production operation; and controlling the blast furnace to execute the target production operation. According to the technical scheme, energy conservation and emission reduction in the blast furnace production process can be achieved.

The application discloses a method for selecting blast furnace charging grade, comprising the following steps: (1) fitting the relationship between blast furnace charging grade and ore consumption and fuel consumption; fitting the relationship between iron ore grade and price; (2) determining the proportion of furnace burden structure, the grade and price of pellet and lump ore, the ratio of coal, and the price of pulverized coal and coke; (3) based on the set blast furnace charging grade, calculating the grade of sinter, and the corresponding grade of mixed ore, calculating the price of mixed ore according to the relationship between iron ore grade and price, and then calculating the price of sinter; (4) calculating the ore consumption and fuel consumption according to the relationship between blast furnace charging grade and ore consumption and fuel consumption, and calculating the molten iron cost corresponding to the current blast furnace charging grade; (5) changing the blast furnace charging grade, executing steps (3)-(5), until the blast furnace charging grade TFe corresponding to the lowest molten iron cost T is found in the limited blast furnace charging grade change range, which is the optimal blast furnace charging grade.

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.

The present invention belongs to the field of blast furnace smelting technology, and specifically discloses a blast furnace smelting method with a high lump ore usage ratio, comprising the following steps: step 1, selecting a suitable lump ore type through a comprehensive charge metallurgical performance experiment; step 2, effectively screening the lump ore to ensure that the lump ore entering the furnace contains no more than 4% powder; step 3, ore blending according to a slag basicity of 1.1-1.2, an Al2O3 content of less than 20%, and a magnesium-aluminum ratio of 0.6-0.65; step 4, distributing the prepared charge according to a certain distribution process, and then putting it into the furnace for smelting. The present invention replaces pellets and part of the sintered ore with suitable natural lump ore, overcomes the adverse effects of the high lump ore ratio by optimizing the ore blending, distribution process, and smelting process parameters, and achieves the purpose of reducing costs and carbon emissions.

The utility model discloses a kind of refractory furnace burden grinding equipment, belong to refractory furnace burden processing technical field, including grinding box, the support column is equipped in grinding box bottom, the feed hopper is installed in grinding box top, buffering cavity and grinding cavity are equipped in grinding box interior, buffering cavity is located in grinding cavity upside, feed hopper is connected with buffering cavity interior, buffering cavity interior is equipped with buffer inclined plate;Buffering cavity is communicated with grinding cavity by feed channel;Grinding cavity interior is equipped with grinding roller, support plate, support slide rail;By setting buffering cavity, buffering effect can be played, prevent a large number of caking refractory furnace burden from impacting to grinding roller, cause damage to grinding roller;Refractory furnace burden is passed to grinding roller surface by feed channel downwards, two driving motors make two grinding rollers rotate oppositely, refractory furnace burden is ground, and by setting connecting plate in the moving part of pneumatic cylinder, connecting plate can be continuously resisted on grinding roller surface, refractory furnace burden adhered to grinding roller surface is cleaned.

The utility model discloses a blast furnace charging bucket gas recovery device which comprises a charging bucket, one side of the charging bucket is connected with a dust remover used for filtering gas through a pipeline, one side of the dust remover is connected with a high-pressure clean gas pipe network through a pressure equalizing pipe, and the surface of the high-pressure clean gas pipe network is connected with a low-pressure clean gas outer net through a first connecting pipe. The bottom of the high-pressure clean gas pipe network is connected with a first water tank, the bottom of the low-pressure clean gas outer network is connected with a second water tank, through connection between the multiple water tanks and the pipe network, it is ensured that gas can flow smoothly in the system, the problem of gas leakage is reduced, gas leakage is effectively prevented through the liquid seal principle of a U-shaped pipe, and the service life of the system is prolonged. And the joint of the bleeder and the second water tank is communicated with a low-pressure clean gas outer net through a third connecting pipe, and multiple pipelines work cooperatively, so that the gas can be fully collected and conveyed to a corresponding pipe network, and the gas recovery efficiency is remarkably improved.

The invention relates to the technical field of thin-strip continuous casting, in particular to an intelligent stainless steel production method combining RKEF smelting and a double-roller thin-strip cast rolling technology.According to the method, the RKEF technology is directly coupled with the stainless steel refining and thin-strip continuous casting technology, firstly, based on target product requirements, an intelligent batching model is adopted for calculating furnace charge of an RKEF furnace; then, based on RKEF molten nickel iron components, an intelligent batching model is adopted to conduct collaborative optimization calculation on added ingredients of the AOD furnace (a dynamic blowing control model is adopted to conduct real-time optimization on the proportion and flow of mixed gas of O2, Ar and N2), and cost optimal dynamic batching under multiple constraints is achieved; then, a neural network algorithm GAN with physical constraint PI is used for predicting components and temperature, predicted values of the components and the temperature and control instructions are output, the metallurgical physical law is used as hard constraint to be embedded into model training, a control decision is made to fit data and conform to scientific rules, process control is conducted accurately, the whole process is more energy-saving, and the method is suitable for large-scale popularization and application. And carbon dioxide emission is reduced.

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.

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 utility model relates to the technical field of submerged arc furnaces, in particular to an industrial silicon double-rotation submerged arc furnace body structure which comprises a submerged arc furnace shell, a feeding opening is formed in the outer portion of the submerged arc furnace shell, a stacking mechanism used for stacking furnace charge is arranged on the face, corresponding to the feeding opening, of the submerged arc furnace shell, and the stacking mechanism comprises a stacking frame, a push plate, a through hole and a push rod. The stacking frame is arranged outside a submerged arc furnace shell and used for storing furnace charge, the push plate is slidably connected to the inner side of the stacking frame and used for pushing the furnace charge, the through hole is formed in the outer side of the stacking frame, the furnace charge is poured into the stacking frame, the stacking frame can serve as a temporary storage point, and scattering of the furnace charge is avoided; the furnace charge is pushed from the inner side of the stacking frame to the inside of the submerged arc furnace to move, the corresponding amount of furnace charge can be pushed into the submerged arc furnace according to needs, meanwhile, the push rod and the push plate are used in cooperation, the furnace charge can be rapidly pushed into the submerged arc furnace, the time for manually arranging the furnace charge is shortened, and the charging efficiency is improved.

A method for smelting high-titanium vanadium-titanium magnetite by means of a hydrogen-enriched carbon-recycling oxygen blast furnace. The method comprises: S1, determining a furnace charge structure; S2, determining a furnace charge distribution regime; S3, determining a blast regime; S4, determining a thermal regime; S5, determining a slagging regime; and S6, smelting high-titanium vanadium-titanium magnetite on the basis of the relevant parameters in steps S1 to S5, wherein the furnace charge structure comprises ores, the ores comprise vanadium-titanium sinter and vanadium-titanium pellets, the vanadium-titanium sinter accounts for 10-70% by mass, the vanadium-titanium pellets account for 90-30% by mass, and the in-furnace mass percentage of vanadium-titanium magnetite contained in the vanadium-titanium sinter and the vanadium-titanium pellets is greater than 65%. The present invention can further improve the smelting intensity on the basis of reducing carbon emissions, thereby achieving efficient comprehensive utilization of the high-titanium vanadium-titanium magnetite, and further achieving efficient smelting of schreyerite.

The present application relates to a kind of blast furnace distribution chute minimum distribution circle number quantification method and application.Firstly, the maximum material passing area is calculated by using the collision point of the material falling from the center throat pipe to the chute receiving bottom, the maximum material flow volume flow allowed by the initial velocity and the maximum material passing area after material flow collision is calculated, and then the shortest distribution time of ore group and coke group is calculated, finally, the minimum distribution circle number of each group is calculated according to the chute rotating speed.When the original distribution circle number is greater than or equal to the minimum distribution circle number, there is no risk of material overflow, and the distribution matrix does not need to be adjusted;When the original distribution circle number is less than the minimum distribution circle number, there is a risk of material overflow, and the distribution matrix needs to be adjusted to make the total distribution circle number exceed the minimum distribution circle number.The present application can accurately grasp the material flow velocity and distribution law, realize the precise control of distribution parameters, ensure the stable material falling point, uniform material surface and reasonable airflow distribution, and support the efficient and stable operation of blast furnace.

The invention discloses a blast furnace burden porosity calculation method based on a Monte Carlo algorithm, and belongs to the technical field of blast furnace ironmaking. The method comprises the steps that firstly, according to a particle size distribution probability density function, Monte Carlo random sampling is adopted to generate and initialize the particle size of furnace charge particles; then, in a three-dimensional Cartesian coordinate system, a three-ball contact geometric constraint equation set is established and solved, and spatial positions of newly-added particles in an existing accumulation system are searched; meanwhile, the search radius of the supporting particles is dynamically adjusted, and collision detection is executed; and finally, after the total number of the particles reaches a preset threshold value, calculating the total volume and the particle volume in a set spherical calculation domain, and determining the porosity by adopting a moving average and moving variance statistical method. According to the method, the limitation of a traditional experimental method and an existing numerical model is overcome, high-precision and high-efficiency calculation of the blast furnace burden porosity is realized, and a reliable theoretical tool is provided for optimizing a blast furnace burden distribution system and analyzing air permeability.

The application provides a preparation method of iron-carbon composite furnace charge and the iron-carbon composite furnace charge and belongs to the technical field of metallurgical processes. The iron-carbon composite furnace charge provided by the application comprises the following raw materials in parts by weight: non-coking coal powder 61-84 parts; iron oxide 10-30 parts; high-temperature accelerator 6-9 parts; hot water 8-12 parts; the preparation method comprises the following steps: after the raw materials are uniformly mixed, the mixed materials are pelletized to obtain pellet materials; the pellet materials are subjected to segmented carbonization at 650 DEG C-1050 DEG C; the pellet materials after carbonization are directly sprayed and cooled to obtain the iron-carbon composite furnace charge. The non-coking coal is not as good as the coking coal in terms of cohesiveness, and the high-temperature strength is low, so it is difficult to be applied in blast furnaces. In the application, the iron oxide is added in the non-coking coal, the particle size of the furnace charge is changed, and the carbonization treatment is carried out in a non-direct roasting furnace to form the iron-carbon composite furnace charge which can replace the coking coal. The application meets the national conditions that the non-coking coal reserves are rich in China, solves the technical problem of insufficient energy storage of the coking coal, reduces the cost, and the carbon emission reduction reaches more than 10%.

This invention discloses a neutral refractory material for medium-frequency induction furnace linings. The raw materials include: 78-83 parts by weight of quartz sand, 5-7 parts by weight of fire clay, 5-7 parts by weight of fluorite, 0.8-1.2 parts by weight of alumina, 1.2-1.8 parts by weight of silicon carbide, and 0.3-0.7 parts by weight of calcium oxide. The preparation method is also disclosed. The method of this invention is simple, with the main components being quartz sand, fire clay, and fluorite, with quartz sand comprising the largest proportion. In addition, some additives such as alumina, silicon carbide, and calcium oxide are added to improve the refractory properties and chemical reactivity of the furnace charge. This results in a material with certain slag resistance and a good service life, exhibiting good overall performance and suitable for melting various metals. The furnace lining mixture is non-toxic, harmless, environmentally friendly, and pollution-free.

The invention discloses a method for directly preparing ferrovanadium by taking ammonium vanadate as a raw material. The method comprises the steps of raw material pretreatment, vacuum heating decomposition, furnace charge mixing and aluminothermic reduction smelting. In the step of vacuum heating decomposition, the pretreated ammonium vanadate is loaded into a double-cone rotary vacuum dryer to be subjected to vacuum heating, so that the pretreated ammonium vanadate is decomposed, ammonia gas and water vapor are released, and a decomposition product with V2O4 and V2O5 as main components is obtained; the step of mixing the furnace charge comprises the following steps: uniformly mixing a decomposition product with aluminum powder, lime, iron powder and a cold charge according to the mass ratio of (60-120): (30-65): (6-10): (6-10): (6-15) based on the mass of V2O5; in the aluminothermic reduction smelting, a magnesium rod is used for igniting furnace charge to carry out aluminothermic reaction; and after the reaction is finished, cooling to room temperature to obtain the ferrovanadium alloy. The method can effectively simplify the process flow, reduce the production cost, improve the product quality, and solve the technical problems of tedious steps and high cost of the traditional process.

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.

This invention discloses a method and apparatus for correcting coefficients in blast furnace charge tank weighing calculations. By dividing the material into different weight groups and defining different furnace top pressure ranges based on the number of weight groups, the method of corresponding different furnace top pressures to different weight ranges is used to calibrate the charge tank weighing system online, correcting relevant parameters in the blast furnace charge tank weighing system. This solves the problems of drift, nonlinearity, and abrupt changes in the charge tank weighing system caused by various factors during the charging process in the prior art, enabling the charge tank weighing system to be dynamically calibrated online, thus achieving the technical effect of improving the accuracy of charge tank weighing data.

The present application belongs to the field of metallurgy, and particularly relates to a multi-point distribution device and method for a flash reduction iron / steel furnace and a smelting furnace. The distribution device comprises a stock bin, a pressure equalizing tank, a blowing tank, a plurality of material conveying pipes and nozzles. The stock bin is connected to the pressure equalizing tank through a valve, and the pressure equalizing tank is connected to the blowing tank through a valve. The blowing tank is a hollow cavity, and the blowing tank is connected to the initial ends of the plurality of material conveying pipes. The terminal ends of the material conveying pipes are connected to the nozzles. A carrier gas pipe is connected to the blowing tank. The present application can realize high dispersion and uniform distribution of the furnace charge on the cross section of the furnace hearth by rational distribution of the plurality of nozzles on the furnace wall and in combination with an independent material distribution air system, thereby avoiding local accumulation and creating optimal initial conditions for efficient and uniform flash reaction.

The invention relates to the technical field of blast furnace ironmaking, and particularly discloses a method for cleaning a dead coke pile in a large blast furnace, a cleaning agent is added into the blast furnace, the cleaning agent adopts hot-melt briquettes or crushed iron particles, and the adding batch weight of the cleaning agent is controlled; controlling the material distribution angle and the material distribution turn number of the cleaning agent; an independent cleaning agent material is added after five batches of normal material distribution, and circulation is carried out; controlling the temperature of the molten iron and the mass percentage of Si element in the molten iron during cleaning of the dead coke pile; the dead coke stockpile cleaning is continuously carried out; according to the method, high-grade hot-melt briquettes or small-particle-size crushed iron particles are adopted as a cleaning agent to clean coke powder shells on the outer layer of the dead coke pile, so that the air permeability and liquid permeability of the dead coke pile are improved; on the basis that an existing material distribution mode is not changed, a group of special cleaning agents entering the blast furnace from special positions are periodically added and used for cleaning coke powder on the outer edge of a central dead coke pile; the furnace charge structure during normal production is not changed, and the furnace condition fluctuation of the blast furnace is avoided to the greatest extent.

A burden structure for smelting of all-vanadium-titanium magnetite pellets in an oxygen blast furnace and a smelting method for all-vanadium-titanium magnetite pellets in an oxygen blast furnace, said method using the burden structure. The burden structure is completely composed of vanadium-titanium magnetite pellets, and comprises the following components: TFe: 51.0-58.0 wt%, SiO2: 3.0-5.0 wt%, CaO: 0.4-5.0 wt%, MgO: 2.0-4.2 wt%, Al2O3: 2.0-4.0 wt%, TiO2: 8.0-11.0 wt%, and V2O5: 0.50-0.80 wt%. The burden structure and the smelting method for all-vanadium-titanium magnetite pellets in an oxygen blast furnace provided in the present invention can achieve smelting of all-vanadium-titanium magnetite pellets, improve the comprehensive utilization rate of vanadium-titanium magnetite, and reduce energy consumption and emissions of carbon dioxide and other pollutants.