609 results about "Bloomery" patented technology

The invention provides a smelting method for improving the stability of a blast furnace under the condition of high gas utilization rate, which comprises the following steps: step 1, using a bell-less furnace top, and preparing charging materials in a tank combination manner, the charging materials comprising coke and ore; step 2, annularly distributing the coke and the ore at a preset angle position in the blast furnace by adopting a simultaneous loading and distributing method; and step 3, keeping the gas utilization rate at 48-54.0%, carrying out blast furnace smelting, dynamically adjusting the oxygen enrichment amount and the coal injection amount of the blast furnace according to the furnace building condition, dynamically adjusting the fuel ratio or the air volume of the blast furnace according to the gas utilization rate decreasing condition, and dynamically adjusting the coal injection amount or the clean coke of the blast furnace according to the stockline decreasing condition. By accurately controlling the ore coke distribution gradient, forming a coal gas flow structure with heavy loads on the edge and an open center, the pressure difference in the furnace can be stabilized through linkage adjustment of the oxygen enrichment amount and the coal injection amount, the fuel ratio / air volume dynamically adjusts and compensates a heat notch, furnace temperature fluctuation is avoided, and the activity of the hearth is rapidly recovered according to the stockline abnormity, the coal injection or net coke supplement strategy.

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 present invention belongs to the technical field of blast furnace smelting and relates to an iron-making method and system based on coupled blowing of CO2-containing coal gas and biomass. The system of the present invention comprises: a material basic data storage and processing module; a material balance and heat balance measurement and calculation module; a biomass addition amount calculation module; a material basic parameter input module; a metallurgical process parameter input module; a smelting parameter constraint interval input module; and a low-carbon smelting parameter output module. A measurement and calculation method according to the present invention is based on the material balance and heat balance. On the premise that CO2-containing coal gas is blown in a blast furnace, the required blowing amount of the biomass and the corresponding coke ratio and coal ratio are calculated on the basis of the heat difference, and low-carbon smelting in the blast furnace is realized. The system and method can guide the blowing of CO2-containing coal gas in the blast furnace and determine the biomass addition amount; in addition, process parameters satisfying low-carbon smelting in the blast furnace can be obtained at any time according to the types and compositions of a fuel, a furnace burden, the CO2-containing coal gas, and the biomass, and compared with original smelting conditions, the purpose of reducing the fuel ratio can be achieved.

The utility model relates to a blast furnace distribution chute in the technical field of metallurgical ironmaking, which comprises a chute body, a plurality of transverse ribs and a plurality of longitudinal ribs are arranged on the inner wall of the chute body; wear-resistant lining plates are arranged on the transverse ribs and the longitudinal ribs in a matched manner; the blast furnace material distribution chute is safe and reliable to use, furnace charge is prevented from directly erosive wear on the chute, the firmness and wear resistance of the blast furnace material distribution chute are improved, the service life is prolonged, and the production cost is reduced.

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.

The present invention relates to an ironmaking method and system coupling CO2-containing gas with biomass injection, belonging to the technical field of blast furnace smelting. The system of the present invention includes a material basic data storage and processing module; a material balance and heat balance calculation module; a biomass addition amount calculation module; a material basic parameter input module; a metallurgical process parameter input module; a smelting parameter constraint range input module; and a low-carbon smelting parameter output module. The calculation method disclosed by the present invention is based on the material balance and heat balance. On the premise of injecting CO2-containing gas into the blast furnace, the injection amount of the required biomass, as well as the corresponding coke ratio and coal ratio, are obtained through heat difference calculation, realizing low-carbon smelting of the blast furnace. The system and method can guide the injection of CO2-containing gas into the blast furnace and determine the biomass addition amount; the process parameters for meeting the low-carbon smelting of the blast furnace can be obtained at any time according to the types and components of fuels, burden materials, CO2-containing gas, and biomass, and compared with the original smelting conditions, the purpose of reducing the fuel ratio can be achieved.

The invention relates to the technical field of blast furnace smelting, and particularly discloses a blast furnace charge can charging method which comprises the following steps: analyzing the furnace top gas temperature and the charge descending speed of a blast furnace, analyzing the balance state of the gas temperature relative value and the descending speed relative value, and calculating to obtain a coal heat balance value; analyzing and judging the adjustment conditions of the charging speed and the coke load; on the basis of the obtained coal heat balance value, calculating and analyzing the specific adjustment process of the charging speed and the coke load; based on the obtained coal heat balance value, performing comprehensive analysis on an abnormal temperature gradient obtained from a temperature gradient change curve in the furnace, and performing optimization adjustment on the charging speed and the coke load; and based on the optimized charging speed and coke load, the blast furnace molten iron temperature is analyzed, an optimized compensation speed and an optimized compensation load are obtained through calculation, and the charging speed and the coke load are subjected to optimized compensation adjustment.

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 discloses nodular cast iron and a production process, and relates to the technical field of nodular cast iron preparation. The invention discloses a nodular cast iron production process. Carbon steel scrap and recirculated iron are used as main furnace materials for smelting, a spheroidizing agent and a first nucleating agent are added for a spheroidizing reaction, pouring is conducted, stream secondary inoculation is conducted, solidification cooling and heat treatment are conducted, and a casting is formed. The process route of the nodular cast iron production process is different from that of a foreign high-silicon solid solution strengthening process route for improving the elongation rate, pig iron is not adopted, only waste steel and recirculated iron are used as main raw materials, and the prepared nodular cast iron meets the requirements of casting products for high strength and high elongation rate of nodular cast iron at the same time; and no precious alloy is added in the production process, so that the production cost is greatly reduced, and the economic benefit is remarkably improved.

The invention relates to a method for adding damping-down materials before long-term damping-down of a blast furnace. The damping-down materials comprise light-load materials and empty coke. The load of the light-load material can be reduced progressively according to the smooth running condition of the blast furnace before damping down, or the load of the furnace material before damping down is maintained. The adding amount of each batch of empty coke is 1.0-1.5 times of that of the coke batch before damping down. The loaded empty coke is completely composed of dry quenching coke with reasonable indexes. When empty coke is added, the flux dosage is not additionally increased any more. And the first batch of empty coke is loaded at the middle position of the furnace bosh. The second batch of empty coke is loaded in the middle of the furnace bosh, the third batch of empty coke is loaded in the lower part of the furnace body, and the fourth batch of empty coke is loaded in the middle of the furnace body. According to the invention, the addition of empty coke is reduced, the recovery of hearth heat is promoted, and the fuel ratio of the blast furnace is reduced.

The invention relates to a process method for inhibiting ring formation of a zinc removal rotary kiln. The process method comprises the following steps: S1, optimizing an ingredient structure: strictly controlling the moisture of a material entering a furnace to be 20-25%, controlling the carbon content to be 1500-1700 kilocalories and controlling the particle size to be 3-8 mm; s2, optimizing a roasting process: sequentially dividing the rotary kiln into a drying section, a preheating section, a high-temperature section and a cooling section from the kiln head to the kiln tail by adopting a segmented roasting technology; wherein the temperature of the high-temperature section is controlled to be 1150-1250 DEG C, the whole calcination time is controlled to be 90-110 min, and the furnace charge filling rate is controlled to be 14-16%; s3, auxiliary equipment is additionally arranged, specifically, a barrel temperature scanner and a pressure detection device are installed on the rotary kiln, the temperature and pressure in the kiln are monitored in real time, and technological parameters are adjusted according to detection data; and S4, initial ring formation removal. By means of optimizing the batching structure, improving the roasting process, additionally arranging auxiliary equipment and the like, stable and continuous operation of the rotary kiln can be achieved, and the operation rate of the rotary kiln is improved.

Disclosed herein, in some aspects, are systems and methods for producing a material comprising iron through self-reduction of iron ore using bio-oil and / or other reducing agents (e.g., bio-based reducing agents), such as biocrude, ethanol, or other bio-based liquids or biologically sourced liquids. The bio-oil and / or other reducing agents can be mixed with the iron ore to form a furnace mixture, which can be heated, such that the components of the bio-oil and / or other reducing agents in the furnace mixture reduce the iron ore to form an iron product (e.g., a material that includes metallic iron). In some cases, the pre-formed furnace mixture allows for the reducing agents to interact with the iron more readily, thereby providing for quicker reaction rates, and thereby quicker reduction of iron ore, as compared to direct reduction iron production.

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 a preparation method of high-silicon high-hematite limonite pellets, and belongs to the field of blast furnace burden, and the preparation method specifically comprises the following steps: step A, carrying out primary batching, drying and wet grinding on concentrate powder, Kara concentrate powder, Brazil concentrate powder, laterite-nickel ore, red mud iron powder and boron-magnesium concentrate powder in proportion; step B, proportionally adding bentonite into the wet-ground material in the step A, and carrying out secondary batching; step C, conveying the materials in the step B into a vertical mixer for strong mixing; step D, conveying the mixed material to a pelletizing chamber for pelletizing; and E, the green pellets are conveyed to a roasting cooling system to be prepared into finished pellets. According to the pellet prepared through the method, the adding amount of bentonite is reduced, the cost is reduced, the compressive strength of the finished pellet can reach 2500N / P or above, the green pellet drop strength, the compressive strength and the dry pellet compressive strength are far higher than those of on-site pellets, and the production requirement can be met.

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 invention discloses a blast furnace burden structure optimization method based on intelligent prediction mixed regulation and control, and belongs to the technical field of blast furnace smelting. The blast furnace burden with alkalinity of 1.05-1.25 and pellet proportion of 100% is prepared by taking high-grade ultralow-titanium vanadium titano-magnetite fine powder as a raw material through material mixing, green pellet preparation, roasting, cooling, intelligent burden prediction and dynamic regulation and control. According to the method, an intelligent prediction model and closed-loop feedback control are combined for the first time, molten drop performance fluctuation is reduced through accurate regulation, the coke ratio is reduced by 3% or above, carbon emission is further reduced, the advantages that the pellet proportion is 100% and the molten drop interval is shortened by 30% or above in the prior art are reserved, and meanwhile the operation stability and adaptability of the blast furnace are improved.

The invention relates to the technical field of new metallurgical processes, in particular to a rapid converter fettling method which adopts fused magnesia, a binding agent and an additive as fettling materials, the fettling materials are flatly laid on the front large face and the rear large face of a converter hearth, oxygen is blown in through an oxygen blowing pipe with the top end closed and the two sides provided with inclined spraying holes to conduct combustion-supporting sintering to form a carbon structure, and the fettling effect is achieved. The method has the beneficial effects that the sintering efficiency is improved, the sintering oxygen lance is improved, the sintering combustion-supporting oxygen amount of the fettling material is increased, the sintering time is shortened, and the production operation rate is increased; the method meets the fettling requirement, and the sintering time is obviously shortened.

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 blast furnace wall bonding treatment method which comprises the following steps: S1, controlling the charging proportion of high-zinc furnace charge, discharging zinc by utilizing central airflow, and reducing the gathering of zinc in the furnace; s2, the air temperature and the oxygen enrichment rate are increased, so that the theoretical combustion temperature in the furnace is increased, the combustion rate of pulverized coal is increased, the yield of the blast furnace is increased, fuel consumption is reduced, and the retention time of the zinc element in the blast furnace is shortened; s3, increasing the operation pressure difference; on the basis of high pressure difference, full-wind operation is carried out, and a high wind speed is kept, so that enough central airflow can be ensured in the blast furnace; s4, the furnace temperature and the air inlet speed are increased; the blast furnace wall body stickers are severely scoured by the airflow, so that the stickers rapidly fall off; and S5, wall body temperature monitoring. The problems of wall bonding, nodulation and the like in the long-term operation process of the blast furnace can be effectively solved, so that the operation efficiency of the blast furnace is improved, and the service life is prolonged.

The invention relates to the technical field of blast furnace ironmaking, in particular to a method for achieving rapid blow-in of a blast furnace through microwaves. The method specifically comprises the following steps that S1, microwave generators and waveguide tubes are installed on an iron notch, a tuyere, a bosh, the lower portion of a furnace body and the upper portion of the furnace body of the blast furnace, and an inner cavity of the furnace body serves as a heating cavity; s2, thermocouples are installed at the upper portion, the tuyere and the iron notch of the blast furnace and used for measuring the temperature of materials in the blast furnace; s3, after oven baking leakage testing is finished, charging is conducted, coke is filled below a bosh, light-load materials are filled from the bosh to the lower portion of the oven body, and normal materials are filled above the middle of the oven body; s4, all microwave generators are started to heat materials in the furnace, and the temperature of furnace charge on the middle-upper portion of the furnace body is controlled to be smaller than the temperature of furnace charge from the lower portion of the furnace body to the hearth; s5, during heating, steam or nitrogen is introduced into the furnace top for cooling; and S6, after the furnace burden is heated to a preset state, the microwave generator is turned off, and air supply blow-in is carried out. The device has the advantages of high heating speed, high efficiency and no pollution.

The invention provides a production method of high-strength nodular cast iron and belongs to the technical field of metal material processing. Comprising the following steps: proportioning: proportioning the following raw materials in percentage by weight: 60-70% of pig iron, 20-30% of foundry returns and 10-15% of waste steel; pig iron is added to the bottom of the furnace, foundry returns are added, and finally waste steel is added; after the molten iron is uniformly molten, heating to 1420-1440 DEG C, and sampling to analyze chemical components; inoculation and nitrogen increasing treatment: spheroidizing by adopting a pouring method, sequentially adding pure antimony, a rare earth magnesium spheroidizing agent and a mixture of ferromanganese nitride and a ferrosilicon inoculant, adding the rest of molten iron and the inoculant in stages, and adding an antimony-containing inoculant during pouring; and after pouring is completed, the box is opened for cooling when the temperature of the casting is reduced to 800-900 DEG C. According to the method, the nitrogen increasing process is matched with microalloying, the problems of high alloy adding amount and high cost in the prior art are solved, the alloy using amount can be remarkably reduced, and meanwhile the mechanical property of cast iron is guaranteed.

The invention relates to a blast furnace top rotating chute structure and a material distribution process parameter optimization method, and belongs to the field of blast furnace smelting automation intelligent control. The method comprises the following steps: establishing a blast furnace top and body geometric model; establishing a furnace charge movement model and a material distribution model on the basis of the blast furnace top geometric model, and simulating the material surface distribution condition of furnace charge entering a furnace throat under different rotating chute structures and material distribution process parameters by adopting a discrete element method; the blast furnace ontology model simulates the state in the blast furnace by adopting a discrete element method and a computational fluid dynamics coupling mode according to a charge level distribution result and set boundary conditions; and continuously adjusting the furnace top rotating chute structure and the material distribution process parameters by utilizing an output result of the blast furnace body model until the rotating chute structure and the material distribution process parameters suitable for the blast furnace ironmaking process are output. According to the invention, simulation is utilized to optimize the rotating chute structure and material distribution process parameters, so that the blast furnace is helped to maintain a stable and smooth state.

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 discloses a two-stage spheroidizing process and processing equipment for a high-nickel austenite ductile iron valve rod nut, and belongs to the technical field of metal smelting, the two-stage spheroidizing process comprises the following steps: S1, preparing raw materials: low-sulfur and low-phosphorus pig iron, scrap steel, ferronickel, a silicon-magnesium-calcium spheroidizing agent and a 75 silicon-iron nucleating agent; the smelting furnace is started, and the low-sulfur and low-phosphorus pig iron, the waste steel and the ferronickel furnace charge are heated to be completely molten; s2, primary spheroidizing: after covering a nucleating agent, rapidly pouring high-temperature molten iron to initiate spheroidizing reaction and promote spheroidizing of graphite; the slagging-off mechanism is convenient and flexible to move, convenient to adapt to different smelting furnaces and casting ladles, convenient to use and capable of rapidly removing dross and rapidly cleaning slag charge, the slagging-off quality is improved, the slagging-off hopper and the striker plate are flexible and rapid to disassemble and assemble and convenient to replace, and the slagging-off efficiency is improved. And then smelting furnaces and molten iron casting ladles with different calibers can be conveniently adapted, so that the technical effect that the slagging-off working efficiency is effectively improved is achieved.

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.