252 results about "Direct reduced iron" patented technology

The invention belongs to the technical field of steel smelting, and particularly discloses a comprehensive utilization method of vanadium titano-magnetite, which comprises the following steps: S1, preparing the vanadium titano-magnetite into pellets, and carrying out reduction reaction to obtain direct reduced iron; s2, a carbonaceous reducing agent and the direct reduced iron obtained in the step S1 are mixed and smelted in a melt separation electric furnace, and slag and molten iron are obtained; a slag former is not added in the smelting process, the purity of the titanium slag is improved through optimal design of the furnace profile of the melting electric furnace and combination of various smelting process control means, the problems that refractory materials of the melting electric furnace are excessively eroded, the service life is short, slag-metal separation is difficult, smelting is difficult to control and the like are solved, and the purposes of high-grade titanium slag and long service life of the melting electric furnace are achieved.

The invention relates to the technical field of smelting, in particular to a preparation method of direct reduction iron. The preparation method of the direct reduced iron comprises the following steps: by taking high-temperature and high-pressure hydrogen-rich synthesis gas generated by gasifying a biomass raw material as reducing gas, reducing pellets containing medium-low-grade iron ores to obtain the direct reduced iron, the high-temperature and high-pressure hydrogen-rich synthesis gas comprises H2 and CO; when the molar fraction of H2 is 50% < = XH2lt; when the content is 65% and the molar fraction of CO is 30%-45%, the reduction reaction temperature is 900-950 DEG C; when the molar fraction of H2 is 65% < = XH2lt; when the molar fraction of CO is 90% and the molar fraction of CO is 5%-30%, the reduction reaction temperature is 850-900 DEG C; when the molar fraction XH2 of H2 is greater than or equal to 90%, the reduction reaction temperature is 800-850 DEG C; the method can realize direct reduction of hydrogen groups of medium-low-grade iron ores, and is low in energy consumption and less in carbon emission.

The invention belongs to the technical field of ironmaking and steelmaking, and particularly discloses a direct reduction iron production process and system of variable feed gas. The production process comprises the following steps: under a basic working condition, a hydrogen-rich working condition or an all-hydrogen working condition, introducing high-temperature reducing gas into a shaft furnace to produce the direct reduced iron; the production system comprises a shaft furnace, a self-heating modification device, an upgrading device, a heating furnace and a preheating furnace, and is provided with three hydrogen supplementing points and two hydrogenation points. By changing the structure of the raw material gas, supplementing hydrogen at three positions or supplementing or adding hydrogen at at least one of two hydrogenation points, increasing the H2 content of the reducing gas at the inlet of the shaft furnace and the like, the carbon emission, the process energy consumption and the pellet reduction difficulty are reduced.

The invention discloses a method and system for directly reducing iron ore powder through a gas-based multi-hearth furnace, and the method comprises the steps that the iron ore powder and reducing gas are subjected to a reduction reaction in a multi-hearth furnace reactor, and reduced metal iron is obtained; the reducing gas is H2 and / or CO, and the reduction temperature is 700-800 DEG C. According to the method and the system, a multi-hearth furnace is adopted, material flow and high-temperature gas are subjected to countercurrent heat convection exchange reaction from top to bottom through a mechanical transmission device, and the method and the system have the advantages of large hearth area, multiple gas-solid interfaces, long retention time of materials in the furnace, high reduction efficiency and the like; the method is suitable for treating powder substances with low heat value. According to the method and the system, the iron ore powder is directly reduced through the multi-hearth furnace, a pelletizing step necessary for an existing hydrogen-based shaft furnace reduction method is omitted, the problem of particle bonding and flow loss of a fluidized bed hydrogen reduction method is effectively solved, and the method and the system have the advantages of low CO2 emission, low energy consumption, high product metallization ratio and the like.

The invention provides a biomass gasification coupling iron ore powder reduction device and method with CO2 circulation, and relates to the technical field of direct reduction of iron from biomass gasification products. The biomass gasification coupling iron ore powder reduction device with CO2 circulation comprises a biomass gasification reaction device and a circulating fluidized bed reduction reaction device. The method comprises a method of a biomass gasification reaction device and a method of a circulating fluidized bed reduction reaction device. Through structural arrangement and application of the biomass gasification reaction device and the circulating fluidized bed reduction reaction device, CO2 gas circulation, zero carbon emission and high-purity iron raw material efficient utilization preparation can be achieved; the preparation method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

The present invention discloses a method for reducing the hydrogen-rich reduction swelling of pellet ore based on stepwise reduction in a hydrogen-based shaft furnace, belonging to the technical field of direct reduced iron production. The pellet ore is successively reduced in the first-stage hydrogen-based shaft furnace (temperature: 780 - 880 °C, volume fraction of H2 + CO > 80%, and volume ratio of H2 / (H2 + CO) is 0.6 - 0.8) and the second-stage hydrogen-based shaft furnace (temperature: 980 - 1040 °C, volume fraction of H2 + CO > 90%, and volume ratio of H2 / (H2 + CO) ≥ 0.8), and then cooled to obtain direct reduced iron. This method can reduce the maximum reduction swelling rate of the entire pellet ore during the reduction process to less than 10% without using pellet additives such as calcium and magnesium. While ensuring the reduction efficiency of the hydrogen-based shaft furnace, it can produce direct reduced iron with quality indicators meeting the requirements and higher iron grade, which is conducive to realizing the clean, efficient, and short-process utilization of iron ore resources.

The present disclosure provides a system and a method for steel synthesis using green hydrogen by coupling renewable energy and Carnot batteries with Solid-Oxide Electrolyser Cells (SOEC) and carbon capture. The system provides an end-to-end, geography-agnostic solution for steel synthesis with green hydrogen with round-the-clock renewable energy using Carnot battery that provides both heat and power to run an SOEC at a high efficiency. The hydrogen from the SOEC may be used for direct reduction of iron followed by steel synthesis in an Electric Arc Furnace. The heat from the SOEC is also used for capturing CO2 from the exhaust gases (or air in the DAC configuration). The captured CO2 may be used for electrofuels synthesis along with green hydrogen or electrochemically reduced to carbon. The process heat from DRI and EAF is recycled back to the Carnot batteries.

The invention discloses a thermal compensation system and method for producing direct reduced iron (DRI) by using a pure hydrogen shaft furnace. The thermal compensation system comprises the shaft furnace, a DRI cooling tower, a 1 # heat exchanger, a 2 # heat exchanger and a feeding device, a DRI outlet of the shaft furnace is communicated with a DRI cooling tower; a hydrogen pipeline is communicated with a hydrogen inlet of the DRI cooling tower, and a hydrogen outlet of the DRI cooling tower is communicated with a process gas inlet of the shaft furnace through a heat exchange passage of the 1 # heat exchanger; a furnace top gas outlet of the shaft furnace is communicated with a process gas inlet of the shaft furnace after passing through a heat exchange passage of the 2 # heat exchanger; and a nitrogen pipeline is sequentially communicated with the other heat exchange passage of the 1 # heat exchanger and the other heat exchange passage of the 2 # heat exchanger and then is communicated with the feeding device. According to the system and the method, heat of the hot-state DRI and the furnace top gas can be effectively utilized to preheat the raw materials entering the furnace, the utilization efficiency of heat energy and hydrogen is fully improved, and low-carbon and even zero-carbon ironmaking is practically achieved.

The invention discloses a method for inhibiting abnormal expansion of ultrahigh-grade pellets through gradient heating reduction of a hydrogen-based shaft furnace, and belongs to the technical field of direct reduction iron production. The method comprises the following steps: continuously adding ultrahigh-grade pellets from the top of a hydrogen-based shaft furnace, and sequentially passing through a first heating reduction zone (the heating speed is 10-20 DEG C / min, and the temperature reaches 900-930 DEG C), a second heating reduction zone (the heating speed is not less than 30 DEG C / min, and the temperature reaches 990-1020 DEG C), a constant-temperature reduction zone and a cooling zone of the hydrogen-based shaft furnace to obtain the direct reduction iron. The method is suitable for the hydrogen-based shaft furnace with various reducing atmospheres, the maximum reduction expansion rate of the ultrahigh-grade pellets in the reduction process of the hydrogen-based shaft furnace can be smaller than 15% on the premise that the original iron grade of the pellets is not reduced, high-purity direct reduction iron with qualified production indexes is produced, and reduction of follow-up electric furnace smelting energy consumption and the molten iron refining process are facilitated.

The invention discloses a smelting method of cold direct reduced iron in a Consteel electric furnace, belonging to the technical field of electric furnace steelmaking. The smelting method comprises the following steps: at the beginning of smelting, low-grade power supply is adopted, and at the same time of power-on, oxygen lances and carbon lances on the furnace wall are used to blow oxygen and spray carbon to produce foamed slag for submerged arc. After 1-3 minutes, scrap steel is continuously added by the Consteel system, and cold direct reduced iron is added through the fifth hole of the electric furnace. The molten steel in the furnace is heated by the electric arc, and the molten steel melts the metal materials in the furnace; during the whole smelting process, lime and light burned dolomite are added in batches. The addition amount of lime is 30-50 kg / t of steel, and the addition amount of light burned dolomite is 25-30 kg / t of steel. The invention helps to maintain the whole-process flat bath smelting, reduce the power consumption of electric furnace smelting, and reduce the smelting cost; it provides a technical solution for a short-process demonstration plant for the efficient use of direct reduced iron in an electric furnace, filling the domestic technical research gap in the short-process industry of electric furnaces.

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 provides an electric furnace which comprises a furnace tank, the furnace tank comprises a push head assembly and a heating part, the push head assembly is arranged at the top of the furnace tank and provided with a push head part capable of being movably arranged in an inner cavity of the furnace tank in a penetrating mode in the vertical direction, and the heating part is attached to the outer side of the furnace tank in the circumferential direction of the furnace tank; the negative pressure feeding mechanism comprises a feeding structure and a horizontal feeding structure, the feeding structure is provided with a transfer box body, an air extraction assembly capable of extracting air and a feeding pipeline used for conveying smelting materials, and one end of the feeding pipeline and the air extraction assembly are in sealed communication with an inner cavity of the transfer box body; the other end of the feeding pipeline is communicated with an inner cavity of the furnace tank in a sealed mode, a feeding port is formed in the transfer box body, the horizontal feeding structure is provided with a horizontal feeding section capable of conveying smelting materials through vibration, and the horizontal feeding section is connected with the feeding port and communicated with an inner cavity of the transfer box body through the feeding port. The problems that the metal yield of direct reduction iron is low, and the nitrogen content in molten steel is high are solved.

The invention provides a process for directly reducing iron and separating iron and aluminum from aluminum oxide red mud, and relates to the technical field of comprehensive utilization of metallurgical solid waste such as red mud and carbon dioxide CCUS. According to the process for directly reducing iron and separating iron from aluminum by using aluminum oxide red mud, solid wastes such as red mud, secondary aluminum ash or other sodium-based additives, metallurgical slag and the like are used as raw materials, and are mixed and granulated after being reasonably matched with a catalyst. Roasting in a gas semi-suspension oxidation kiln; and the roasted material enters a self-gravity closed electric heating reduction kiln to be calcined by taking biomass as fuel. CO gas generated by calcination is used as fuel of the fuel gas semi-suspension oxidation kiln. After calcination, under the protection of excessive CO gas, the high metallization ratio of 95% or above is achieved, iron and aluminum are separated, the material cooled to about 200 DEG C is leached with water, the levigated material enters a magnetic separator, solid-liquid separation and solid-phase magnetic separation of metal iron are achieved, and titanium concentrate and slag are separated.

This application relates to the field of steel production technology, and in particular to a method and apparatus for evaluating the flexibility of a hydrogen-based shaft furnace. The method includes: establishing a time-domain dynamic simulation model of the hydrogen-based shaft furnace to obtain production time-domain data; constructing an initial flexibility model of the hydrogen-based shaft furnace considering the direct reduction iron metallization rate based on the first-order dynamic reaction process of the furnace; adjusting the initial flexibility model using the production time-domain data to obtain a final discretized flexibility model; and integrating the discretized flexibility model into the objective function of the hydrogen-based shaft furnace under real-time electricity prices to obtain the flexibility evaluation result. This solves the problem that related technologies often use steady-state models, which are difficult to characterize the dynamic evolution of the furnace's temperature field, gas concentration field, and reaction process under operating condition disturbances such as load changes, hydrogen supply fluctuations, and changes in raw material properties, easily leading to deviations between model predictions and actual operating conditions.

The invention relates to a process for smelting molten iron for converter steelmaking by using hydrogen-based shaft furnace direct reduction iron. The process comprises the following steps: 1) smelting raw materials comprise direct reduction iron, coke powder and lime; and (2) after the smelting raw materials enter the furnace, a material accumulation area is formed between the electrode and the furnace lining, the height of the accumulation area is larger than the length of an electric arc generated by the electrode, and the distance between the bottom of the electrode and the liquid level of molten iron is kept to be 200-300 mm. And 3) continuously supplying power to the electrodes, continuously melting the smelting raw materials, and forming a molten iron layer, a slag layer and a raw material layer at the furnace bottom from bottom to top. And (4) the pressure in the furnace is controlled within 0-100 pa. And (5) the molten iron generated by the electric furnace and the slag are regularly discharged in a slag-iron mixing mode. According to the method, a blast furnace ironmaking process is not used, and the direct reduced iron produced by hydrogen-based shaft furnace smelting is directly used as a main raw material to smelt the molten iron, so that the possibility that the hydrogen-based reduced iron is used for converter steelmaking on a large scale is provided.

The invention relates to production equipment and a production method for preparing direct reduced iron. According to the method, all components in the raw coke oven gas and sensible heat of the reduced pellets are fully utilized, the raw coke oven gas and the treated coke oven gas are used for preparing the direct reduction iron together, and the method has the advantages of being simple in process, low in energy consumption and the like.

The application discloses a method for preparing Fe-CaTiO3 heterogeneous visible light Fenton catalyst from vanadium-titanium magnetite, and comprises the following steps: (1) vanadium-titanium magnetite powder, bentonite, slaked lime and water are mixed according to a proportion, and then enter a disc balling machine to be balling to prepare green balls; (2) the green balls prepared in the step (1) are dried and roasted to prepare oxidized pellets; (3) the oxidized pellets are reduced in a hydrogen-rich reducing atmosphere to obtain direct reduced iron (DRI) containing CaTiO3; (4) the DRI is cooled to below 50 DEG C under the protection of inert gas; and (5) the cooled DRI is crushed and ball milled, and thus Fe-CaTiO3 is obtained. The prepared Fe-CaTiO3, H2O2 and visible light constitute a photo-assisted heterogeneous Fenton reaction system, which can efficiently catalyze degradation of organic pollutants in wastewater; and the method has the advantages of low preparation cost, high catalytic activity, easy recovery and reusability.

The invention relates to a method for heating DRI (abbreviation for "direct reduced iron", also referred to as sponge iron) between a direct reduction plant and a further-processing plant, wherein the DRI (2) is conducted in the form of a DRI stream (3) from the direct reduction plant to the further-processing plant by means of a line arrangement (1) and the line arrangement (1) has one or more induction coils (4) in the form of a heating element for contactless heating of the DRI stream (3) conducted through the line arrangement (1), wherein the induction coil (4) or the induction coils (4) is / are operated with alternating current. The invention is characterized in that a frequency of at least 10 kHz is specified and / or set as the frequency of the alternating current.

1. A direct iron ore reduction process, in which an NH3-containing gas feed (24a) is fed to a gas reformer (25) where it is reformed to obtain a hydrogen-containing reducing gas (25a, 25b), at least a portion of which is fed to a direct reduction reactor (1) where iron ore (2) is subjected to direct reduction with the reducing gas (25a, 25b) to obtain directly reduced iron (30), and during reforming of the hydrogen-containing reducing gas (25a), NH3 in the gas feed (24a) is subjected to the dissociation reaction 2NH3 → N2 + 3H2.

Provided is a reduced iron production method that can suppress clustering of iron ore pellets. A reduced iron production method according to the present invention is characterized by comprising: a pellet production step for mixing an iron ore powder, a binder, and an auxiliary material, granulating the mixture to obtain green pellets, and baking the green pellets to obtain iron ore pellets; and a reduction step for charging the iron ore pellets in a vertical shaft furnace, and directly reducing the same by using a reducing gas to obtain reduced iron pellets. The reduced iron production method is characterized in that: raw materials of the iron ore powder include an iron ore having a compositional makeup in which the total Fe amount is 63 mass% or less and the sum of SiO2 and Al2O3 is 4 mass% or more; and the reduced iron pellets satisfy the following formula. (SiO2+Al2O3+CaO+MgO+FeO) / M.Fe ≥ 0.15

The disclosure relates to a process for producing molten iron or an alloy thereof from low- carbon direct reduced iron (DRI) in an electric arc furnace (EAF). The DRI comprises less than 0.1 wt% carbon. The process comprises a combined charging and melting stage comprising continuously charging DRI to a molten metal bath in the EAF and concurrently operating the EAF to continuously melt the DRI. During this stage, the process is maintained within the following operational window - bath temperature of from about 1580 °C to about 1750 °C; - FeO in slag of from about 25 wt% to about 40 wt%; - slag B2 basicity of from about 1.5 to about 3.5, wherein the B2 basicity is calculated as (wt% CaO) / (wt% SiO2); - MgO in slag of from about 8 wt% to about 13 wt%; and - carbon monoxide (CO) in offgas > 26 Nm3 / h / m2.

1. A method for hot rolling steel, comprising: i. smelting steel scrap containing at least one of the following residual elements: Mo, Sn, Sb, As, and optionally hot metal from a blast furnace and / or direct reduced iron, to a theoretical hot rolling temperature T HR_TH ii. estimating the composition of the molten steel; iii. casting a semi-finished product with the molten steel; and iv. determining the minimum hot rolling temperature increase, T, that can offset the presence of the residual elements: Mo, Sn, Sb, and / or As. OFFSET and v. defining the temperature T HR hot rolling at T HR =T HR_TH +T OFFSET and

The invention discloses a coal-based tank-type ball block direct reduction iron canning device, and relates to the field of environmental protection equipment, the coal-based tank-type ball block direct reduction iron canning device is characterized in that a shell is fixedly connected with a vertical plate, the vertical plate is fixedly connected with a mounting plate, the mounting plate is provided with a group of uniformly distributed mounting holes, the shell is fixedly connected with symmetrical cylinders, and the cylinders are fixedly connected with the vertical plate. The symmetrical cylinders are respectively provided with an opening, the symmetrical cylinders are respectively and fixedly communicated with a discharging pipe, the shell is provided with a groove body, the symmetrical openings are respectively communicated with the groove body, the symmetrical cylinders are respectively and fixedly connected with round head shells, the shell is fixedly connected with a first vertical rod, the shell is fixedly connected with a gear protection shell, and the gear protection shell is fixedly connected with a second vertical rod. The vertical plate is fixedly connected with the first transverse plate. The technical problem to be solved by the invention is to provide the coal-based tank-type ball block direct reduction iron canning device which has the characteristics of simple structure, reliability, practicability, reduction of stations of the canning device, low investment, improvement of the mechanization and automation degree of a production line, reduction of the amount of labor and the like.

The present invention relates to a method for producing hot metal in an electric smelting furnace 13, comprising the following consecutive steps: - providing a direct reduced iron product 12, - providing a carbon and iron-containing material 30, - alternately feeding the DRI product 12 and the carbon and iron-containing material 30 to at least a part of the smelting furnace, - melting the DRI product 12 and the carbon and iron-containing material 30 to produce hot metal 14. The present invention also relates to the production of steel from said hot metal.

The invention relates to a method for co-producing direct reduced iron based on a dry powder coal pressurized gasification furnace, which comprises the following steps: producing high-temperature raw gas with the pressure of 0.6-1.2 MPa and the temperature of 1450-1600 DEG C by adopting the dry powder coal pressurized gasification furnace, adding hydrogen with the temperature of 300-400 DEG C to obtain reducing gas with the temperature of 850-950 DEG C, and feeding the reducing gas into a DRI reduction shaft furnace to produce the direct reduced iron, and the produced furnace top gas with the pressure of 0.6-1.2 MPa and the temperature of 350-500 DEG C is subjected to heat exchange with normal-temperature hydrogen, the temperature is adjusted to 190-210 DEG C, CO conversion is carried out to obtain normal-temperature conversion hydrogen, the normal-temperature conversion hydrogen exchanges heat with the furnace top gas and then is added into the high-temperature raw gas to obtain reducing gas, and the process is cycled. According to the method, the direct reduced iron is co-produced through capacity expansion and pressure reduction of the dry powder coal pressurized gasification furnace, so that low energy consumption of the coal gas direct reduced iron is realized, and zero carbon emission is realized on the basis of capturing and recycling CO2.

A direct reduction system for a direct reduction of iron ore, comprising a reactor having a reduction area and being adapted to be loaded from above with said iron ore; a treatment and feeding line, to process the process gases, thus obtaining a reducing gas mixture, and feed said reducing gas mixture into the reduction area; a line for recovering and treating an exhausted gas exiting the reactor, communicating upstream with the reactor and downstream with said treatment and feeding line; wherein at least one bypass duct is provided, adapted to divert at least one portion of reducing gas mixture from said treatment and feeding line to said recovery and treatment line.

A system and method for process water and oxide coating recovery and distribution in a direct reduction system, such as a system for producing direct reduced iron. A warm lime softener is used to remove (recover) calcium, alkalinity, and other constituents from the process water system and to produce an effluent that can be further processed and returned as makeup to the process water system. The lime softening process requires lime (or similar material) to be added to the influent, thereby increasing the calcium and pH levels until they become supersaturated and precipitate. This chemical process results in effluent that is low in calcium, alkalinity, and total suspended solids.

The invention relates to a device and method for measuring the resistance of a spherical furnace burden, and belongs to the technical field of metallurgical production. The device comprises an insulating shell and a furnace charge placing cavity arranged in the shell and used for accommodating a furnace charge to be detected. An opening is formed in the top side of the furnace charge containing cavity and is closed through an adjusting plate in sliding fit with the insulating shell, and a first contact pin and a second contact pin are installed on the adjusting plate. Four upright posts are arranged at the bottom of the placing cavity, two upright posts are insulators, and the other two upright posts are a third contact pin and a fourth contact pin which are made of conductors. The first contact pin and the third contact pin are connected with a voltmeter through wires to form a voltage loop. The second contact pin and the fourth contact pin are connected with the ammeter through wires to form a current loop. The method comprises the following steps: placing a spherical furnace charge in an insulating shell, adjusting the contact position of a contact pin and the furnace charge, supplying power by using a constant-current power supply, recording voltage and current values, and calculating the contact resistance according to R = U / I. The device effectively reduces the influence of wire resistance and contact resistance on a measurement result, improves the accuracy of low-resistance measurement, and is suitable for spherical furnace charges with different particle sizes and components, including waste steel, direct reduction iron and the like. The sliding design of the adjusting plate simplifies the operation process and improves the test efficiency.

The invention discloses a short-process method for preparing raw material pure iron by directly reducing iron, and belongs to the technical field of metallurgy. According to the method, direct reduction iron with the metallization ratio larger than or equal to 92% serves as a main raw material (the proportion is larger than or equal to 60%), pure waste steel and slagging materials are added, electric arc furnace inert gas protection smelting (segmented power supply, multi-stage slagging phosphorus, oxygen and sulfur removal and oxygen blowing decarburization till [C] is smaller than or equal to 0.025%) is carried out, further decarburization ([C] is smaller than or equal to 0.01%) is carried out through VOD refining, deoxidation alloying is carried out, and finally continuous casting blank forming is carried out in the whole process. The obtained raw material pure iron meets the GB / T 9971-2017 standard, the process is short, slag and iron separation is thorough, and the raw material pure iron can serve as furnace charge of high-end products such as precision alloy and high-temperature alloy.

The invention discloses an electric furnace steelmaking method adopting high-density carbon balls to match carbon. The method comprises the following steps: calculating the mass of high-density carbon balls according to the recarburization content required by a smelted steel grade through a specific carbon blending theoretical calculation model, paving the carbon balls at the bottom of a material basket, then adding direct reduced iron, and enabling the carbon balls to enter a furnace before the direct reduced iron by utilizing the design of a special discharge port of the material basket so as to improve the carbon blending efficiency. The volume density of the high-density carbon spheres is 2.0-3.5 g / cm < 3 >, the particle size is 30-50 mm, the adding amount is flexibly adjusted according to actual conditions, and the consumption of each ton of steel is 20-30 kg. The method overcomes the defects in the prior art, carbon can be accurately prepared, the electric furnace smelting power consumption is reduced, the steelmaking cost is reduced, and the nitrogen content of molten steel is effectively controlled. Compared with a conventional raw material mode, the power consumption of each test furnace is reduced by 463 KWh, the power consumption of each ton of steel is reduced by 35 KWh / t, and the method is simple and convenient to operate, free of equipment transformation, suitable for an electric arc furnace steelmaking process and good in application prospect.