WO2024185210A1 - 溶鉄の製造方法 - Google Patents

溶鉄の製造方法 Download PDF

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Publication number
WO2024185210A1
WO2024185210A1 PCT/JP2023/040489 JP2023040489W WO2024185210A1 WO 2024185210 A1 WO2024185210 A1 WO 2024185210A1 JP 2023040489 W JP2023040489 W JP 2023040489W WO 2024185210 A1 WO2024185210 A1 WO 2024185210A1
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WO
WIPO (PCT)
Prior art keywords
burner
preheating chamber
furnace
chamber
melting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/040489
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English (en)
French (fr)
Japanese (ja)
Inventor
太 小笠原
信彦 小田
康一 堤
由枝 中井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to KR1020257024460A priority Critical patent/KR20250126114A/ko
Priority to EP23926416.1A priority patent/EP4656742A1/en
Priority to JP2024546450A priority patent/JP7772242B2/ja
Priority to CN202380095367.3A priority patent/CN120813708A/zh
Publication of WO2024185210A1 publication Critical patent/WO2024185210A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5252—Manufacture of steel in electric furnaces in an electrically heated multi-chamber furnace, a combination of electric furnaces or an electric furnace arranged for associated working with a non electric furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B11/00—Making pig-iron other than in blast furnaces
    • C21B11/10—Making pig-iron other than in blast furnaces in electric furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/12—Making spongy iron or liquid steel, by direct processes in electric furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
    • C21B13/143—Injection of partially reduced ore into a molten bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/56—Manufacture of steel by other methods
    • C21C5/562—Manufacture of steel by other methods starting from scrap
    • C21C5/565—Preheating of scrap
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/04—Recirculation of the exhaust gas
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/06—Energy from waste gas used in other processes

Definitions

  • the present invention relates to a technology for melting cold iron sources with high productivity and reduced power consumption.
  • Patent Documents 1 and 2 disclose a technique for providing highly efficient heat in an iron bath-type smelting reduction furnace, in which a lance for feeding powdered ore is installed separately from the top-blowing lance for supplying oxidizing gas.
  • a flow hole for the ore is provided at the tip of the lance, and a burner consisting of injection holes for blowing in fuel and oxygen is provided, and the ore is supplied so that it passes through the flame generated by the burner.
  • the ore heated in the flame transfers heat to the molten iron in the furnace, dramatically improving the utilization of the burner combustion heat.
  • the temperature of the gas generated by burner combustion i.e., the exhaust gas temperature, is reduced by transferring heat from the gas generated by burner combustion to the powdered material in the burner flame.
  • the melting reduction process described in Patent Document 2 shows that the powder fuel ratio S/Q is 0.3 or more when the supply rate of the powder is S (kg/min) and the calorific value of the burner fuel per unit time is Q (MJ/min). In other words, it shows that it is necessary to supply a sufficient amount of powder and granular material relative to the combustion heat of the burner.
  • the amount of heat generated by the burner and the amount of heat that can be applied to the molten iron in the furnace are limited by the amount of powder that can be supplied during the refining process. If excess powder is supplied to the refining process in excess of the powder-like auxiliary materials actually required, extra sensible heat is required to heat the excess powder to the molten iron temperature, resulting in a heat loss that exceeds the amount of heat applied by the burner.
  • the present invention was made in consideration of these circumstances, and aims to propose a technology for melting cold iron sources that provides a highly efficient means of heat application in an electric furnace, is highly productive, and reduces the unit power consumption.
  • the method for producing molten iron according to the present invention uses an electric furnace equipped with a melting chamber and a preheating chamber, and melts a cold iron source with electric energy.
  • the method is characterized in that a burner is provided in the melting chamber, which has an injection hole for ejecting fuel and an injection hole for ejecting a combustion-supporting gas, and ejects a flame from the injection hole toward the furnace contents in the melting chamber, and powdered or powdered auxiliary materials are blown in so that they pass through the flame formed by the burner, and exhaust gas generated by the combustion of the burner is led into a preheating chamber, and when preheating the cold iron source in the preheating chamber, the supply speed of the fuel or auxiliary materials used in the burner is adjusted to preheat the cold iron source in the preheating chamber to a predetermined temperature.
  • the method for producing molten iron according to the present invention is as follows: (a) setting the upper limit of the preheating temperature of the cold iron source to 1200°C; (b) setting the calorific value of the fuel used in the burner per unit time as Q (MJ/min) and the supply rate of the auxiliary material as S (kg/min), so that the powder fuel ratio S/Q (kg/MJ) is 0.10 or more and 0.50 or less; (c) the electric furnace is an electric furnace equipped with a vertical preheating chamber; This may be a more preferable solution.
  • the powder and granular material is heated in the burner flame and becomes a heat transfer medium, so that the burner combustion heat can be used to heat the cold iron source and molten iron in the melting chamber of the electric furnace with high efficiency, and the amount of electricity used can be reduced. Furthermore, the high-temperature exhaust gas generated by the combustion of the burner is conducted into a preheating chamber located in a position separate from the melting chamber in which the burner is arranged, and is used to heat the cold iron source filled in the preheating chamber. This allows the sensible heat of the exhaust gas to be used effectively.
  • the supply rate of the fuel or auxiliary materials used by the burner is adjusted to preheat the cold iron source in the preheating chamber to a specified temperature. Therefore, no excess auxiliary materials are required, and the combustion heat of the burner can be appropriately distributed between heating the molten metal in the melting chamber and preheating the cold iron source in the preheating chamber. This makes it possible to use the combustion heat of the burner with high efficiency for melting the cold iron source.
  • FIG. 1 is a schematic vertical cross-sectional view showing an overview of an AC arc furnace having a melting chamber and a preheating chamber, as an electric furnace according to one embodiment of the present invention.
  • FIG. A schematic vertical cross-sectional view of the tip of a burner lance used in the above embodiment.
  • FIG. 1 is a schematic vertical cross-sectional view showing an overview of an AC arc furnace 101 as an electric furnace according to one embodiment of the present invention, and shows the mode of operation of an AC arc type electric furnace.
  • the electric furnace 101 is equipped with a melting chamber 1 in which iron-based scrap, which is a cold iron source x, is melted by arc heating, and a preheating chamber 2 in which the iron-based scrap x to be supplied to the melting chamber 1 is preheated.
  • the top of the melting chamber 1 is covered by a water-cooled furnace lid 4 that can be opened and closed.
  • a water-cooled furnace lid 4 that can be opened and closed.
  • multiple electrodes 5 are inserted from above, penetrating the furnace lid 4, forming an arc heating section A that melts the ferrous scrap by blowing an arc between these electrodes 5.
  • the electrodes 5 are made of graphite or the like, and can move up and down. Stirring may also be performed by blowing gas into the bottom of the furnace.
  • a shaft-type (vertical) preheating chamber 2 is connected to the upper part of the melting chamber 1, away from the arc heating section A, and this preheating chamber 2 is connected to the melting chamber 1 in a vertical relationship.
  • An openable and closable scrap loading port 20 is provided at the top of the preheating chamber 2.
  • An exhaust port 21 is provided at the upper part of the preheating chamber 2, and an exhaust duct 6 is connected to this exhaust port 21.
  • This exhaust duct 6 is connected to a suction blower (not shown), and the high-temperature exhaust gas generated in the melting chamber 1 flows into the preheating chamber 2 by suction from this suction blower, and after passing through this preheating chamber 2, it is exhausted from the exhaust duct 6.
  • a dust collector (not shown) is provided midway through the exhaust duct 6.
  • a bottom-opening supply bucket 13 suspended from a traveling cart 16 can move, and from this supply bucket 13, ferrous scrap x is loaded into the preheating chamber 2 through the scrap loading opening 20.
  • a gate 22 is provided at the bottom of the preheating chamber, separating the melting chamber 1 from the preheating chamber 2.
  • the gate 22 has a through hole so that the high-temperature exhaust gas in the melting chamber 1 can be conducted to the preheating chamber.
  • the gate is opened and the iron-based scrap x in the preheating chamber 2 is loaded into the melting chamber.
  • the iron-based scrap x in the space 1a is naturally pushed out toward the arc heating section A by the weight of the iron-based scrap x filled in the preheating chamber 2 and the space 1a.
  • the melting chamber 1 may be provided with an extruder (pusher) facing the space 1a below the preheating chamber 2, for pushing the ferrous scrap x filled in this space 1a toward the arc heating section A by the electrodes 5.
  • This extruder 3 is provided so as to be able to penetrate the side wall of the melting chamber 1 and move back and forth toward the arc heating section A (towards the furnace center in this embodiment), and is preferably driven by a drive device (not shown) and uses its tip to push the ferrous scrap x in the space 1a toward the arc heating section A.
  • the burner lance 9 is inserted into the melting chamber 1 from a burner lance insertion hole provided in the furnace lid 4 so that it can rise and fall.
  • the burner lance 9 is inserted vertically from the furnace lid so that it can rise and fall, but this is not limited to this.
  • the burner lance 9 may be inserted obliquely from above the furnace wall toward the inside of the furnace.
  • the burner is not limited to a lance type that can rise and fall, and may be in a form in which the nozzle part is fixed to the furnace lid or furnace wall.
  • the burner may be given an oxygen supply function and oxygen may be supplied from the burner.
  • the burner lance 9 sprays a burner flame 9a toward the surface of the furnace contents, such as the cold iron source x and molten iron m, contained in the melting chamber 1.
  • an oxygen blowing lance or a carbon blowing lance may be inserted from above through the furnace lid 4 into the melting chamber 1.
  • the carbonaceous material injection lance may inject one or more types of carbonaceous material, such as coke, char, coal, charcoal, and graphite, into the molten slag s using air or nitrogen as a carrier gas.
  • carbonaceous material such as coke, char, coal, charcoal, and graphite
  • oxygen may be supplied (injected) from the oxygen injection lance, and the oxygen may push aside the molten slag and be injected into the molten iron m.
  • oxygen-containing gas e.g., a mixture of pure oxygen and air
  • oxygen blowing lance instead of pure oxygen, oxygen-containing gas (e.g., a mixture of pure oxygen and air) may be blown from the oxygen blowing lance.
  • the melting chamber 1 has a tapping port 11 at the bottom of the furnace opposite the side where the preheating chamber 2 is located.
  • a slag tapping port 12 is also provided on the side wall above it. These tapping ports 11 and slag tapping ports 12 are blocked by sand and mud material that are filled inside, and a tapping door 14 and a slag tapping door 15 that hold them down from the outside.
  • FIG. 1 shows a state in which iron-based scrap is charged as the cold iron source x, and the cold iron source x is melted by starting the current supply.
  • powdered auxiliary material 9b is sprayed from a burner lance 9 through a burner flame 9a to promote the melting of the cold iron source x.
  • a fuel mainly made of hydrogen gas produced by renewable energy such as solar, wind, or hydraulic power.
  • the fuel mainly made of hydrogen gas refers to hydrogen gas or hydrogen-rich gaseous fuel, and the hydrogen-rich gaseous fuel can be a mixed gas of hydrogen gas and methane gas, natural gas, or petroleum gas. From the viewpoint of reducing CO2 , it is preferable to mix hydrogen gas at 50 vol% or more.
  • an AC arc furnace 101 having three electrodes is used as the electric furnace, but a DC arc furnace having an upper electrode and a lower electrode may also be used.
  • the electrodes 5 and the arc are located in the center of the furnace body, and the installation position of the burner lance 9 is limited.
  • the burner of this embodiment can reduce the temperature of the burner flame 9a by appropriately injecting powdered auxiliary material 9b even when using a fuel mainly made of hydrogen gas, so that it can be operated without damaging the water-cooled panels of the furnace wall or the refractory material of the hearth.
  • FIG. 2 shows a schematic diagram of the tip 30 of the burner lance 9 used in the above embodiment.
  • a powder supply pipe 31 having an injection hole at the center is arranged, and a fuel supply pipe 32 and a combustion-supporting gas supply pipe 33 having injection holes are arranged in sequence around the powder supply pipe 31.
  • the outside of the powder supply pipe 31 is provided with an outer shell 35 having a cooling water passage 34.
  • a fuel gas 36 and a combustion-supporting gas 37 are supplied from the injection holes provided on the outer periphery of the powder supply pipe 31 to form a burner flame 9a. Then, the powdered auxiliary material 9b injected from the powder supply pipe 31 is heated in the burner flame 9a.
  • the powdered auxiliary material 9b becomes a heat transfer medium, so that it is possible to improve the heat transfer efficiency of the flame to the furnace contents such as the cold iron source x and the molten iron m. As a result, it is possible to reduce the amount of electricity.
  • a mixed gas of oxygen and CO 2 or an inert gas, air, or oxygen-enriched air can be applied as the combustion-supporting gas 37.
  • the gas for transporting the powdery auxiliary material 9b may be an inert gas or a combustion-supporting gas.
  • a cold iron source x such as ferrous scrap, which is the main raw material
  • a cold iron source x is first charged from a supply bucket 13 into the melting chamber 1 and preheating chamber 2 of an AC arc furnace 101 shown in FIG. 1.
  • electricity is started.
  • a burner lance 9 installed at the top of the furnace is inserted into the melting chamber 1, and the cold iron source x is heated by electricity and the combustion heat of the burner flame 9a.
  • Exhaust gas is passed into the preheating chamber 2 and used to preheat the cold iron source x in the preheating chamber 2.
  • the inventors used an AC arc furnace equipped with a melting chamber and a preheating chamber as shown in Figure 1, and a normal AC arc furnace without a preheating chamber, and by varying the fuel gas flow rate and powder supply rate in various ways, investigated the heat transfer efficiency to the furnace contents, and the preheating temperature of the cold iron source when an AC arc furnace equipped with a preheating chamber was used.
  • the ratio of the supply rate S (kg/min) of the powdered auxiliary material 9b to the heat value Q (MJ/min) per unit time of the fuel 36 used in the burner lance 9 is defined as the powdered fuel ratio S/Q.
  • the powdered fuel ratio S/Q exceeds 0.50 (kg/MJ), in other words, the calorific value of the fuel is too small relative to the amount of powdered granular material supplied, there is a risk that the effects of reducing the unit power consumption and improving productivity will be small.
  • the calorific value of the fuel is excessive relative to the amount of powder and granular material supplied, specifically, when the powder fuel ratio S/Q is below 0.30 (kg/MJ), the power reduction effect and productivity improvement effect were confirmed.
  • the powder fuel ratio S/Q is below 0.30 (kg/MJ)
  • the power reduction effect and productivity improvement effect were confirmed.
  • the efficiency of the burner combustion heat contributing to the heating of the powder and granular material is low, and the burner flame temperature and exhaust gas temperature are high, exceeding 1500°C, but it is possible to preheat the cold iron source in the preheating chamber.
  • the burner combustion heat can be used highly efficiently without any restrictions on the supply of powder and granular material required for refining processing.
  • the preheating temperature of the cold iron source in the preheating chamber increases, and when the preheating temperature exceeds 1200°C, the cold iron sources in the preheating chamber are fused together, and there is a risk that it becomes difficult to remove the cold iron source from the preheating chamber. Therefore, it is preferable to set the upper limit of the preheating temperature of the cold iron source in the preheating chamber to 1200°C.
  • the preheating temperature of the cold iron source in the preheating chamber is 1200°C or less.
  • the lower limit of the preheating temperature of the cold iron source in the preheating chamber is not limited, from the viewpoint of thermal efficiency, it is preferable that the preheating temperature exceeds the temperature of the cold iron source at the time of charging into the preheating chamber, and the preheating temperature is more preferably 300°C or more, and even more preferably more than 500°C.
  • the powder type may be a slag-forming material, dust, etc., which is a powder or a powdered auxiliary material 9b.
  • a slag-forming material dust, etc.
  • auxiliary material 9b a powder or a powdered auxiliary material 9b.
  • the particle size of the auxiliary material is large, it is preferable to process the particle size to approximately 100 ⁇ m or less by crushing or the like.
  • the particle size is expressed as a 50% passing rate based on volume.
  • the cold iron source x it is preferable to use solid reduced iron reduced with iron-based scrap or a reducing agent with reduced CO2 emissions.
  • the solid reduced iron contains about 10 to 20 mass% of gangue derived from iron ore as SiO2 or Al2O3 .
  • This slag s has a high melting point composition as it is, and is likely to solidify and adhere to the furnace wall, causing operational disruption.
  • the powdered auxiliary material 9b heated by the burner and supplied since the basicity in the slag s, that is, the mass ratio CaO/ SiO2 , can be controlled to about 1.0. This makes it possible to lower the melting point of the slag s and inhibit the solidification of the slag s. Furthermore, since heat is imparted to the slag s by the heated powder, the effect of promoting the formation of slag slag can be obtained.
  • the slag discharge port may be opened and slag discharge may be performed during melting or before the molten metal is poured out.
  • the electric furnace can be any that uses electrical energy to melt a cold iron source and obtain molten iron.
  • an arc furnace not only the above-mentioned AC or DC arc furnaces, but also submerged arc furnaces in which heating is performed by immersing a Seeberg-type self-baking electrode or the like in the slag, may be used.
  • it may be an indirect resistance furnace in which the object to be heated is heated by radiation from a heating element installed in the furnace, or by convection and conductive heat transfer within the furnace.
  • it may be a plasma arc melting furnace.
  • the molten iron m melted in this embodiment has a composition equivalent to the metal composition of the iron-based scrap and solid reduced iron that are the main raw materials, and is usually molten steel with a relatively low C content.
  • alloys may be added directly in the electric furnace where it was melted, or finishing decarburization and dephosphorization processes such as oxygen blowing may be performed.
  • secondary refining such as molten steel desulfurization and vacuum degassing may be performed.
  • semi-finished products such as cast pieces are produced through a casting process such as continuous casting.
  • a cold iron source melting test was conducted using an AC arc furnace (A) without a preheating chamber, and an AC arc furnace (B) equipped with a melting chamber and a preheating chamber similar to that shown in Figure 1. Scrap was used as the cold iron source, and the total charge amount was 100 t.
  • the initial cold iron source melted and the height of the charge in the furnace dropped, and when a space was created in the upper part of the furnace, the burner lance was lowered and heating by the burner flame was also used.
  • Argon gas was used as the carrier gas for supplying the powder.
  • Propane gas was used as the fuel gas and was changed from 2.2 to 14 Nm3/min for each heat of the electric furnace.
  • the powder fuel ratio S/Q was 0.08 to 0.51 kg/MJ.
  • oxygen gas was supplied as a combustion-supporting gas for burning the fuel gas propane in each heat.
  • the power consumption rate is an index obtained by dividing the amount of power used under each processing condition by the amount of power used in Processing No. 1.
  • the electric furnace processing time is the time (minutes) from the start of current application to the start of molten metal tapping.
  • the burner combustion heat transfer efficiency represents the ratio of the amount of heat transferred to the furnace contents out of the amount of heat generated by the burner fuel.
  • the temperature of the scrap at the bottom of the preheating chamber just before it was inserted into the furnace was measured with a radiation thermometer, and this temperature was used as the cold iron source preheat temperature. The results are shown in Table 1. Table 1 also lists the type of electric furnace and the burner specifications.
  • treatment No. 2 in which the furnace contents were heated by a burner flame alone, an AC arc furnace (A) without a preheating chamber was used, and compared to treatment No. 1, in which no burner was used, the burner combustion heat was not transferred effectively, and the power consumption rate and electric furnace treatment time were almost the same.
  • treatments No. 3 to 12 in which the powdered lime was heated in the burner flame, the power consumption rate and electric furnace treatment time were reduced. This is because the powdered lime was heated in the burner flame, and some of the burner combustion heat was transferred to the furnace contents.
  • the calorific value of the fuel was excessive compared to the powdered lime supply rate (treatments No.
  • Processes No. 13-22 in which powdered lime was heated in a burner flame in an AC arc furnace (B) equipped with a melting chamber and a preheating chamber, the power consumption rate and electric furnace processing time were reduced, similar to Processes No. 3-12, in which powdered lime was heated in a burner flame in an AC arc furnace (A) without a preheating chamber.
  • Processes No. 13-22 were more superior to Processes No. 3-12 when compared at the same powder fuel ratio S/Q.
  • the AC arc furnace (A) without a preheating chamber at a level where the fuel heat generation amount was excessive compared to the powdered lime supply rate (Processes No.
  • the scrap in the preheating chamber melted together, and there were some heats where operation was hindered, such as not being able to load the scrap into the furnace even when the gate at the bottom of the preheating chamber was opened. It is preferable to keep the preheating temperature of the scrap in the preheating chamber below 1200°C.
  • the unit of mass "t" used in this specification represents 10 3 kg.
  • the "N” attached to the unit of gas volume represents the volume under standard conditions of a temperature of 0° C. and a pressure of 101,325 Pa.
  • the heat transfer efficiency is improved, and the cold iron source can be melted using a heat source with reduced CO2 emissions, which reduces the power consumption rate and reduces the environmental load, making it industrially useful. It is suitable for application to processes such as refining furnaces that require a heat source with reduced CO2 emissions and the addition of powdered auxiliary materials.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
PCT/JP2023/040489 2023-03-07 2023-11-10 溶鉄の製造方法 Ceased WO2024185210A1 (ja)

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Application Number Priority Date Filing Date Title
KR1020257024460A KR20250126114A (ko) 2023-03-07 2023-11-10 용철의 제조 방법
EP23926416.1A EP4656742A1 (en) 2023-03-07 2023-11-10 Method for producing molten iron
JP2024546450A JP7772242B2 (ja) 2023-03-07 2023-11-10 溶鉄の製造方法
CN202380095367.3A CN120813708A (zh) 2023-03-07 2023-11-10 铁液的制造方法

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JP2023034273 2023-03-07
JP2023-034273 2023-03-07

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TW (1) TWI881534B (https=)
WO (1) WO2024185210A1 (https=)

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Publication number Priority date Publication date Assignee Title
JP2000008115A (ja) * 1998-06-19 2000-01-11 Nkk Corp 冷鉄源の溶解方法
JP2008179876A (ja) * 2006-03-23 2008-08-07 Jfe Steel Kk 粉体加熱バーナーランスおよびそれを用いた溶融還元方法
JP2018016832A (ja) * 2016-07-26 2018-02-01 Ｊｆｅスチール株式会社 電気炉による溶鉄の製造方法

Family Cites Families (6)

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