WO2023054588A1 - Procédé de fabrication de fer - Google Patents

Procédé de fabrication de fer Download PDF

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Publication number
WO2023054588A1
WO2023054588A1 PCT/JP2022/036451 JP2022036451W WO2023054588A1 WO 2023054588 A1 WO2023054588 A1 WO 2023054588A1 JP 2022036451 W JP2022036451 W JP 2022036451W WO 2023054588 A1 WO2023054588 A1 WO 2023054588A1
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Prior art keywords
iron
goethite
mass
rich portion
rich
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PCT/JP2022/036451
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English (en)
Japanese (ja)
Inventor
守利 水谷
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日本製鉄株式会社
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Application filed by 日本製鉄株式会社 filed Critical 日本製鉄株式会社
Priority to CN202280064864.2A priority Critical patent/CN118019864A/zh
Priority to CA3231868A priority patent/CA3231868A1/fr
Priority to KR1020247009492A priority patent/KR20240055010A/ko
Priority to AU2022356833A priority patent/AU2022356833A1/en
Priority to JP2023551849A priority patent/JPWO2023054588A1/ja
Publication of WO2023054588A1 publication Critical patent/WO2023054588A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B2005/005—Selection or treatment of the reducing gases

Definitions

  • the present invention relates to an iron manufacturing method.
  • This application claims priority based on Japanese Patent Application No. 2021-159551 filed in Japan on September 29, 2021, the content of which is incorporated herein.
  • the direct reduction ironmaking method is known as one of the ironmaking methods for obtaining iron from raw materials containing iron oxide (reducing iron oxide).
  • the direct reduction ironmaking process has continued to develop against the background of the low construction cost of the plant for this process, the ease of operation, and the ability to operate in a small-scale plant.
  • various improvements have been made to effectively utilize the reducing gas in the furnace.
  • Typical examples include HYBRIT and MIDREX+ H2 , which utilize hydrogen obtained by electrolysis of water in a shaft furnace type direct reduction ironmaking process.
  • DRI Direct Reduction Iron
  • DRI Direct Reduction Iron
  • the energy consumption rate during electric furnace operation increases, Cost increases (for example, Non-Patent Document 1).
  • blast furnaces use unreduced iron ore, sintered ore, and pellets with a high gangue content. Units do not increase. Rather, replacing iron ore, sintered ore, and pellets with DRI reduces the energy consumption rate (for example, Non-Patent Document 2).
  • DR pellets with a low gangue amount are used in the direct reduction ironmaking process.
  • DR pellets are manufactured from iron ore (concentrate) that has been enriched by magnetic or gravity beneficiation, but DR pellets are produced only from raw ore with good gangue separability produced in specific areas. of concentrate cannot be produced.
  • Australian iron ore is not beneficiated because it is difficult to separate the gangue, resulting in a large amount of gangue. Furthermore, in recent years, not only iron ore produced in Australia, but also iron ore raw materials have deteriorated in quality. Along with this, the amount of iron ore gangue is increasing, and it is estimated that the production of DR pellets will become increasingly difficult in the future. Iron ore of inferior quality, including Australian iron ore, contains a large amount of water of crystallization.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a new and improved iron ore raw material capable of efficiently agglomerating and reducing iron ore raw materials of inferior quality. It is to provide a method of making iron.
  • the gist of the present invention is as follows.
  • high-crystal-water iron ore having an ignition loss of 3 to 12 mass% is beneficiated into a goethite-rich portion having an ignition loss of at least 4 mass% and an iron content of 55 mass% or more.
  • a first agglomeration treatment step in which the goethite-rich portion is agglomerated into first fired pellets in a pellet firing furnace; C. or higher and directly reduced using a reducing gas containing 60% by volume or more of hydrogen.
  • the first fired pellets may be directly reduced to a metallization rate of 60% to 95%.
  • Aspect 3 of the present invention is the iron manufacturing method of aspect 1 or 2, wherein in the ore dressing step, a hematite-rich portion having an ignition loss of less than 4% by mass and an iron content of 55% by mass or more is further beneficiated, It may further comprise a second agglomeration treatment step of agglomerating the part into second fired pellets in a pellet firing furnace.
  • Aspect 4 of the present invention is the steelmaking method of aspect 3, wherein the second fired pellets are directly reduced in a shaft furnace using a reducing gas containing 60% by volume or more of hydrogen to obtain a metallization rate of 90% or more. You may further have a 2nd reduction process set as direct reduced iron.
  • Aspect 5 of the present invention is the iron manufacturing method according to any one of Aspects 1 to 4, further comprising a washing treatment step of removing tailings from the high-crystalline water iron ore before the mineral beneficiation treatment step.
  • the numerical range shown using “-" includes the numerical value of both ends of "-".
  • the percentage (%) of each component such as iron ore in the table means % by mass with respect to the total mass of iron ore and the like.
  • the iron content is measured according to JIS M 8212: 2005 iron ore-total iron determination method.
  • loss of ignition (LOI) is regarded as the content of water of crystallization. Loss on ignition (LOI) is defined as the mass reduction rate when iron ore is held at 1000° C. for 60 minutes.
  • the agglomeration method and reduction method according to the present embodiment are iron manufacturing methods that utilize iron ore containing a large amount of water of crystallization, for example, goethite-containing iron ore from Australia, which has abundant reserves.
  • an iron ore raw material is separated into a goethite-rich portion mainly composed of goethite by beneficiation.
  • the beneficiation process it may be separated into a hematite-rich portion mainly composed of hematite, a goethite-rich portion mainly composed of goethite, and a gangue-rich portion mainly composed of gangue.
  • the hematite-rich portion is a portion having an LOI of less than 4% by mass and an iron content of 55% by mass or more
  • the goethite-rich portion is a portion having an LOI of 4% by mass or more and an iron content of 55% by mass or more
  • a rich portion is a portion having an iron content of less than 55% by mass.
  • the hematite-rich portion is a portion of the high crystalline water iron ore that is mainly composed of hematite, and refers to a portion of the high crystalline water iron ore having an LOI of less than 4% by mass and an iron content of 55% by mass or more.
  • the portion mainly composed of hematite refers to a portion having a hematite content of 50% by mass or more with respect to the total mass of the portion.
  • the goethite-rich portion is a portion of the high crystalline water iron ore that is mainly composed of goethite, and refers to a portion of the high crystalline water iron ore having an LOI of 4% by mass or more and an iron content of 55% by mass or more.
  • the part mainly composed of goethite means that the content of goethite is 50% by mass or more with respect to the total mass of the part.
  • the gangue-rich portion is a portion of the high crystalline water iron ore in which gangue is the main constituent, and refers to a portion of the high crystalline water iron ore having an iron content of less than 55% by mass.
  • a part mainly composed of gangue means that the content of gangue is 50% by mass or more with respect to the total mass of the part.
  • high-crystal-water iron ore containing a large amount of crystal water (here, LOI is regarded as its content) by EDS (energy dispersive X-ray spectroscopy) was analyzed, identification of mineral phases, composition of each phase, etc. were analyzed.
  • high crystal water iron ore refers to iron ore containing 3 to 12% by mass of water of crystallization. That is, in the present specification, the ignition loss of the high crystalline water iron ore is 3 to 12% by mass.
  • the high crystalline water iron ore contains a hematite-rich part mainly composed of hematite, a goethite-rich part mainly composed of goethite, and a gangue-rich part mainly composed of gangue. was present in goethite-rich and gangue-rich areas.
  • the inventor of the present invention came up with the following idea. That is, the high-crystal-water iron ore is subjected to beneficiation treatment by specific gravity, and the divided portion is determined to be any of the hematite-rich portion, the goethite-rich portion, and the gangue-rich portion, and the hematite-rich portion and the goethite-rich portion are determined. are separately agglomerated and reduced by suitable methods.
  • the hematite-rich portion contains a large amount of iron, by agglomerating it into fired pellets and directly reducing it in a shaft furnace to make reduced iron, it can be used as a raw material for electric furnaces with the same quality as conventional DR pellets.
  • the goethite-rich part has a relatively low iron content, so it is converted to semi-reduced iron and used as raw material for blast furnaces.
  • the high crystalline water iron ore can be efficiently produced.
  • the sintered pellets derived from the goethite-rich part are inferior to the conventional sintered pellets derived from hematite and magnetite in terms of strength and reduction pulverization due to the detachment of water of crystallization.
  • the goethite-rich portion may be used as a raw material for sintered ore. This also avoids the aforementioned problems associated with using pellets made from goethite-rich sections in shaft furnaces.
  • the iron ore (iron ore raw material) to be treated in the present embodiment is the above-described high-crystalline water iron ore.
  • High crystal water iron ore contains 3 to 12% by mass of water of crystallization.
  • the mass % of water of crystallization is measured as loss on ignition (LOI).
  • LOI loss on ignition
  • High crystalline water iron ores often contain 55-67 mass % iron.
  • An example of a high crystalline water iron ore is the Australian iron ore Brockmannite having the components shown in Table 1.
  • the grain size of the high crystalline water iron ore is not particularly limited.
  • a raw material of high crystalline water iron ore mined from a vein is first coarsely crushed.
  • the lump ore for blast furnace is extracted, it is pulverized to a particle size of 50 mm or less, and the lump ore with a particle size of 50 mm to 10 mm is recovered as a lump ore with a particle size of less than 10 mm as fine ore.
  • the high-crystalline-water iron ore used as the starting material for the embodiment of the present invention may be either coarsely pulverized from which no lump ore is extracted, or fine ore.
  • FIG. 1 shows the overall flow of the agglomeration method S10 and the reduction method S20 in the ironmaking method according to the present embodiment.
  • FIG. 2 shows the overall flow of another agglomeration method S10A and reduction method S20A in the ironmaking method according to this embodiment.
  • the agglomeration method S10 includes a water washing treatment step S1, a mineral beneficiation treatment step S2, and a first agglomeration treatment step S3B.
  • the agglomeration method S10 may further include a sintered ore production step S4.
  • the agglomeration method S10A in which the hematite-rich portion is also beneficiated and agglomerated, includes a water washing process S1, a beneficiation process S2, a first agglomeration process S3B, and a second agglomeration process S3A. ,including.
  • a high crystalline water iron ore which is an iron ore raw material, is separated into a plurality of pieces using a gravity separation method. Then, the separated site is determined from the iron content and the LOI for the goethite-rich site. Whether the separated portion is a hematite-rich portion, a goethite-rich portion, or a gangue-rich portion may be determined from the iron content and the LOI.
  • the hematite-rich portion is a portion having an LOI of less than 4% by mass and an iron content of 55% by mass or more
  • the goethite-rich portion is a portion having an LOI of 4% by mass or more and an iron content of 55% by mass or more
  • a rich portion is a portion having an iron content of less than 55% by mass.
  • the separated goethite-rich portion is agglomerated according to the flow of FIG. Each of the separated parts may be individually agglomerated according to the flow of FIG.
  • the hematite-rich portion is agglomerated into second fired pellets in a pellet firing furnace.
  • the goethite-rich portion is agglomerated into first fired pellets in a pellet firing furnace.
  • the goethite-rich portion may be made into sintered ore by a sintering machine. Depending on the iron content of the gangue-rich portion, it may be discarded or used as raw material for sinter ore.
  • Clay minerals can be removed from high crystalline water iron ore by water washing. Specifically, for example, the iron ore raw material is washed with water using a drum type scrubber or a washing sieve. Thereby, clay minerals (so-called tailings) with a particle size of 20 to 45 ⁇ m or less adhering to the surface of the iron ore raw material can be washed away. Tailings are low in iron and should be discarded.
  • Table 2 shows an example of the results of water washing treatment. As is clear from Table 2, by removing clay minerals in advance, the iron content of the iron ore raw material can be increased and the gangue component can be reduced.
  • the washed iron ore raw material is beneficiated and separated into a plurality of parts.
  • the high-crystal-water iron ore is beneficiated into a goethite-rich portion having an iron content of at least 55% by mass or more.
  • the high crystalline water iron ore is divided into a hematite-rich portion having an ignition loss LOI of less than 4% by mass and an iron content of 55% by mass or more, and a goethite-rich portion having an ignition loss LOI of 4% by mass or more and an iron content of 55% by mass or more. Beneficiation may be done in part and part.
  • the high-crystalline-water iron ore may be further beneficiated into a gangue-rich portion having an iron content of less than 55% by mass. Then, the LOI and iron content of each separated portion are analyzed to determine to which of the hematite-rich portion, goethite-rich portion, and gangue-rich portion it belongs.
  • gravity beneficiation treatment gravity separation treatment
  • the iron ore raw material into a hematite-rich portion, a goethite-rich portion, and a gangue-rich portion.
  • Magnetic beneficiation may be performed together with specific gravity beneficiation.
  • an iron ore raw material is classified with a grain size of about 3 mm.
  • Classification may be performed with a sieve.
  • the iron ore raw materials above the sieve and below the sieve are preferably subjected to specific gravity beneficiation by the following methods.
  • Above sieve JIG or heavy liquid separation
  • Below sieve Spiral, Up-current classifiers (UCC), Wet High Intensity Magnetic Separation (WHIMS) or heavy liquid separation
  • UCC Up-current classifiers
  • WHIMS Wet High Intensity Magnetic Separation
  • JIG JIG is a type of specific gravity beneficiation process, and is a method of sorting mineral particles by utilizing the difference in specific gravity.
  • Mineral particles are supplied to a bed of particles with a mesh bottom.
  • water is intermittently flowed from the bottom to the top to raise the water level. This causes the mineral particles to be hoisted into the water and temporarily suspended. Then stop the water flow. This causes the mineral particles to re-sett on the net as the water level descends and returns.
  • the higher the specific gravity of the mineral particles the faster the mineral particles fall, so mineral particles with higher specific gravity gather at the bottom of the particle layer after settling.
  • the mineral particles can be concentrated by specific gravity. That is, by extracting the desired mineral particles from each of the formed particle layers, the mineral particles can be sorted according to their specific gravity.
  • Spiral is a type of specific gravity beneficiation process, and is a beneficiation method that utilizes centrifugal force generated in slurry (a mixture of water and mineral particles) flowing through a spiral trough.
  • slurry a mixture of water and mineral particles
  • the beneficiation efficiency is controlled by adjusting the feed size and the amount of water in the trough.
  • UCC UCC is also a type of gravity beneficiation process.
  • a slurry mixture of water and mineral particles
  • an upward stream of water is supplied from the bottom.
  • these particles interact and come into contact with each other, and the mineral particles with a low specific gravity ride on the rising water flow, so that they can be separated from other mineral particles.
  • Mineral particles with high specific gravity are less susceptible to rising water currents. It is discharged from the bottom of the device.
  • the beneficiation efficiency is controlled by adjusting the feed size and the amount of rising water flow.
  • WHIMS is a method of mineral beneficiation with a magnetic force of 8000-12000 gauss or more. Disposed within the device is a rotating rotor and magnets disposed within the rotor. When a slurry (a mixture of water and mineral particles) is fed into the device, the non-magnetic particles are not attracted to the magnet, so they fall and are collected in a fixed tray at the bottom of the rotation. Paramagnetic particles are captured by a high magnetic force and high gradient magnetic field, and ejected at the point where the magnetism weakens as the rotor rotates. Ferromagnetic particles travel with the rotation of the rotor and are expelled away from the magnetic field.
  • a slurry a mixture of water and mineral particles
  • Heavy liquid sorting is a type of gravity beneficiation process. Heavy liquid sorting is also called heavy liquid ore beneficiation, heavy liquid coal beneficiation, floating/sink sorting, and the like. Heavy liquid sorting is a method of separating useful minerals and waste rocks using a liquid with a large specific gravity (heavy liquid) as a medium. Heavy liquid materials (magnetite, slag, barite, etc.), which have a specific gravity two to three times that of the heavy liquid to be produced, are hard and difficult to miniaturize, have good chemical stability, and are easy to purify and collect, are pulverized into water. to obtain a heavy liquid. Mineral particles having a higher specific gravity than the heavy liquid sink in the heavy liquid, and mineral particles having a lower specific gravity float on the upper surface of the heavy liquid, thereby separating mineral particles having a desired specific gravity.
  • Heavy liquid sorting is a type of gravity beneficiation process. Heavy liquid sorting is also called heavy liquid ore beneficiation, heavy liquid coal beneficiation, floating/sink sorting, and the
  • the iron ore raw material (highly crystalline water iron ore) is at least hematite-rich with an ignition loss LOI of less than 4% by mass and an iron content of 55% by mass or more. and a goethite-rich portion having an ignition loss LOI of 4% by mass or more and an iron content of 55% by mass or more.
  • An iron ore feedstock can be separated into a hematite-rich fraction, a goethite-rich fraction, and a gangue-rich fraction.
  • Table 3 shows an example of the results of gravity separation of iron ore raw materials (high crystalline water iron ore) by UCC.
  • the UCC can separate the iron ore raw material into a hematite-rich portion, a goethite-rich portion, and a gangue-rich portion.
  • the goethite-rich portion and the hematite-rich portion are separately agglomerated using a pellet firing furnace to obtain raw materials for direct reduction.
  • the hematite-rich portion is agglomerated using a pellet firing furnace.
  • the goethite-rich portion is agglomerated using a pellet firing furnace.
  • a specific method of the pellet manufacturing process is not particularly limited, and may be performed according to a general pellet manufacturing method.
  • An example of the pellet manufacturing process is described in Non-Patent Document 3 (KOBE STEEL ENGINEERING REPORTS/Vol. 60 No. 1 (Apr. 2010).
  • the pellet manufacturing process is performed by the method described in the document.
  • the manufacturing method is not limited to the method described in this non-patent document.
  • Table 4 shows an example of the composition of each pellet. Since the fired pellets derived from the hematite-rich portion (second fired pellets) have a low gangue content, they can be directly reduced and used as raw materials for electric furnaces. The fired pellets derived from the goethite-rich portion (first fired pellets) have a relatively high gangue content and are not suitable as raw materials for electric furnaces, so they can be used as raw materials for blast furnaces. Goethite-rich pellets in Table 4 mean the first fired pellets, and hematite-rich pellets mean the second fired pellets.
  • the goethite-rich portion may be agglomerated using a sintering machine and used as a raw material for a blast furnace, instead of the above-described pellet manufacturing step.
  • the conditions for producing sintered ore are not particularly limited. Fired pellets derived from the goethite-rich portion may have problems of strength and reduction pulverizability during reduction. Agglomeration as sintered ore can avoid the problem.
  • the gangue-rich portion is preferably discarded or agglomerated as sintered ore in a sintering machine, depending on its iron content.
  • the reduction method S20 includes a first reduction step S5B.
  • the reduction method S20 may include a blast furnace step S6.
  • a reduction method S20A for further reducing the fired pellets derived from the hematite-rich portion includes a first reduction step S5B and a second reduction step S5A.
  • the fired pellets derived from the hematite-rich portion (second fired pellets) are directly reduced using a shaft furnace to obtain direct reduced iron having a metallization rate of 90% or more.
  • the obtained direct reduced iron can be used as a reduced iron raw material for an electric furnace.
  • the reducing gas As the reducing gas, natural gas, synthetic gas (Syn-gas), H 2 gas, etc. can be used.
  • the reducing gas preferably contains 60% by volume or more of hydrogen gas.
  • the operating conditions of the shaft furnace are, for example, as follows.
  • molten steel is obtained using the reduced iron for electric furnace obtained in the second reduction step S5A.
  • ⁇ Reducing gas temperature 700-1000°C ⁇ Reducing gas flow rate 1000 to 2200 Nm 3 /t-DRI (flow rate per ton of reduced iron) - Metallization rate: 90% or more
  • the metallization rate is defined as metallic iron concentration/total iron concentration x 100.
  • the method for measuring the concentration of metallic iron is specified in ISO 5416 Bromine-methanol titration method for measuring metallic iron in reduced iron.
  • the total iron concentration is specified in JIS M 8212: 2005 Iron Ore-Total Iron Determination Method.
  • the fired pellets derived from the goethite-rich portion are charged into a shaft furnace at a surface temperature of the first fired pellets of 600 ° C. or higher, and a reducing gas containing 60% by volume or more of hydrogen.
  • a surface temperature of the first fired pellet is not particularly limited, and is 800° C., for example.
  • the first fired pellet may be directly reduced to a semi-reduced state with a metallization rate of 60 to 95% to obtain a semi-reduced fired pellet.
  • a more preferred degree of metallization after direct reduction is 60-90%.
  • a semi-reduced state means a state with a metallization rate of 60 to 95%.
  • the obtained semi-reduced fired pellets can be used as raw materials for blast furnaces if the metallization rate is high.
  • a semi-reduced calcined pellet refers to a calcined pellet with a metallization rate of 60% to 95%.
  • the reducing gas natural gas, synthetic gas (Syn-gas), H 2 gas, etc. can be used.
  • the reducing gas preferably contains 60% by volume or more of hydrogen gas.
  • the operating conditions of the shaft furnace are, for example, as follows.
  • the upper limit of hydrogen gas is not particularly limited, and is, for example, 100% by volume.
  • the temperature of the sintered pellets (first sintered pellets) derived from the goethite-rich portion when charged into the shaft furnace is less than 600° C.
  • the first sintered pellets are pulverized in the shaft furnace, and the shaft Raw material clogs in the furnace, resulting in poor discharge. Therefore, the temperature of the first fired pellets when charged into the shaft furnace is 600° C. or higher.
  • the temperature of the first fired pellets when charged into the shaft furnace is preferably 650° C. or higher. Since the gangue-rich portion is agglomerated as sintered ore as described above, it is preferably used as a raw material for a blast furnace.
  • the highly crystalline water iron ore is beneficiated into a hematite-rich portion, a goethite-rich portion, and a gangue-rich portion, and is reduced by a method suitable for each. Therefore, it is possible to efficiently reduce an iron ore raw material of inferior quality.
  • Dust recycling The dust and DRI powder generated from the direct reduction ironmaking process should be treated in the same route as the goethite-rich zone. Dust and DRI powder have the effect of improving the strength of pellets, and when used in goethite-rich pellets with low strength, strength can be improved.
  • the blast furnace step S6 of the hematite-rich portion or goethite-rich portion that has been beneficiated in the beneficiation treatment step, a portion having a grain size that can be used as lump ore in the blast furnace may be directly used in the blast furnace, or the goethite-rich portion may be used directly in the blast furnace.
  • the resulting calcined pellets may be charged directly into the blast furnace.
  • Pig iron can be obtained in the blast furnace step S6.
  • steel can be obtained from the pig iron obtained in the blast furnace step S6.
  • Example 1 sintered pellets derived from the goethite-rich portion having the composition shown in Table 4 were charged into a shaft furnace to produce semi-reduced iron. Natural gas or synthetic gas was used as reducing gas.
  • the manufacturing conditions are as follows.
  • the raw material temperature is the temperature of the sintered pellets when charged into the shaft furnace.
  • Raw material used fired pellets derived from the goethite-rich part described in Table 4 above ⁇ Raw material temperature 650 ° C ⁇ Reducing gas temperature 950°C ⁇ Reducing gas flow rate 1200 Nm 3 /t-DRI ⁇ Metallization rate 82% ⁇ Use of products Composition of semi-reduced iron and reducing gas for blast furnace is the temperature (°C) of the input gas (Inlet) or the output gas (Outlet).)
  • semi-reduced iron with a metallization rate of 82% could be produced.
  • the semi-reduced iron derived from the goethite-rich portion contains many gangue components, and is therefore suitable as a raw material for blast furnaces.
  • Example 2 sintered pellets derived from the hematite-rich portion having the composition shown in Table 4 were charged into a shaft furnace to produce reduced iron. Hydrogen gas was used as the reducing gas.
  • the manufacturing conditions are as follows. ⁇ Materials used: Hematite-rich pellets listed in Table 4 above ⁇ Material temperature: 650°C ⁇ Reducing gas temperature 1020°C ⁇ Reducing gas flow rate 1400 Nm 3 /t-DRI ⁇ Metallization rate 94% ⁇ Use of products Composition of reduced iron and reducing gas for electric furnaces is the temperature (°C) of the input gas (Inlet) or the output gas (Outlet).)
  • Example 2 it was possible to produce reduced iron with a metallization rate of 94%.
  • the reduced iron derived from the hematite-rich portion contains few gangue components, and is therefore suitable as a raw material for electric furnaces.
  • Example 3 sintered pellets derived from the goethite-rich portion having the composition shown in Table 4 were charged into a shaft furnace to produce semi-reduced iron. Hydrogen was used as the reducing gas.
  • the manufacturing conditions are as follows. ⁇ Raw material used: fired pellets derived from the goethite-rich part described in Table 4 ⁇ Raw material temperature 600 ° C ⁇ Reducing gas temperature 1050°C ⁇ Reducing gas flow rate 1250 Nm 3 /t-DRI ⁇ Metallization rate 85% ⁇ Use of products Composition of semi-reduced iron and reducing gas for blast furnace is the temperature (°C) of the input gas (Inlet) or the output gas (Outlet).)
  • semi-reduced iron with a metallization rate of 84% could be produced.
  • the semi-reduced iron derived from the goethite-rich portion contains many gangue components, and is therefore suitable as a raw material for blast furnaces.
  • Example 4 sintered pellets derived from the goethite-rich portion having the composition shown in Table 4 were charged into a shaft furnace to produce semi-reduced iron. Hydrogen was used as the reducing gas.
  • the manufacturing conditions are as follows.
  • Raw material used fired pellets derived from the goethite-rich part described in Table 4 ⁇ Raw material temperature 650 ° C ⁇ Reducing gas temperature 1020°C ⁇ Reducing gas flow rate 1580 Nm 3 /t-DRI ⁇ Metallization rate 92% ⁇ Use of products Composition of semi-reduced iron for blast furnace or reduced iron/reduced gas for electric furnace Volume % is shown.
  • the column of Temp in Table 8 is the temperature of the input gas (Inlet) or the temperature (° C.) of the output gas (Outlet).
  • semi-reduced iron with a metallization rate of 92% could be produced.
  • the semi-reduced iron derived from the goethite-rich portion contains many gangue components, and is therefore suitable as a raw material for blast furnaces.
  • the high metallization rate because of its high metallization rate, it can also be used as reduced iron for electric furnaces.
  • Example 5 sintered pellets derived from the goethite-rich portion having the composition shown in Table 4 were charged into a shaft furnace to produce semi-reduced iron. Hydrogen was used as the reducing gas.
  • the manufacturing conditions are as follows.
  • Raw materials used fired pellets derived from the goethite-rich part described in Table 4 ⁇ Raw material temperature 620 ° C ⁇ Reducing gas temperature 980°C ⁇ Reducing gas flow rate 1700 Nm 3 /t-DRI ⁇ Metallization rate 95% ⁇ Use of products Composition of semi-reduced iron for blast furnace or reduced iron/reduced gas for electric furnace Volume % is shown.
  • the column of Temp in Table 9 is the temperature of the input gas (Inlet) or the temperature (° C.) of the output gas (Outlet).
  • semi-reduced iron with a metallization rate of 95% could be produced.
  • the semi-reduced iron derived from the goethite-rich portion contains many gangue components, and is therefore suitable as a raw material for blast furnaces.
  • the high metallization rate because of its high metallization rate, it can also be used as reduced iron for electric furnaces.

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  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Manufacture Of Iron (AREA)

Abstract

Ce procédé de fabrication de fer comprend : une étape de traitement de minéral pour traiter un minerai de fer ayant une teneur élevée en eau de cristallisation et une perte par calcination de 3 à 12 % en masse dans une partie riche en goethite ayant une perte par calcination d'au moins 4 % en masse ou plus et contenant au moins 55 % en masse de fer ; une première étape de traitement d'agglomération pour agglomérer la partie riche en goethite en premières pastilles chauffées dans un four de chauffage de pastilles ; et une première étape de réduction pour charger les premières pastilles chauffées dans un four à cuve tandis que les premières pastilles de chauffage ont une température de surface de 600 °C ou plus, et réduire directement les premières pastilles chauffées à l'aide d'un gaz réducteur contenant 60 % en volume ou plus d'hydrogène.
PCT/JP2022/036451 2021-09-29 2022-09-29 Procédé de fabrication de fer WO2023054588A1 (fr)

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JPH0310027A (ja) * 1989-06-05 1991-01-17 Nippon Steel Corp 高ゲーサイト鉱石の事前処理法
JPH07166248A (ja) * 1993-12-13 1995-06-27 Nkk Corp 焼成塊成鉱の製造方法
JP2012102371A (ja) * 2010-11-10 2012-05-31 Nippon Steel Corp 予熱原料を使用した直接還元炉の操業方法
JP2013133512A (ja) * 2011-12-27 2013-07-08 Jfe Steel Corp 高炉用原料の製造方法
JP2020020010A (ja) * 2018-08-02 2020-02-06 日本製鉄株式会社 高燐鉄鉱石の還元方法
JP2021159551A (ja) 2020-04-02 2021-10-11 株式会社三共 遊技機

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KR101409516B1 (ko) * 2009-03-16 2014-06-19 신닛테츠스미킨 카부시키카이샤 소결광의 제조 방법

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JPH0310027A (ja) * 1989-06-05 1991-01-17 Nippon Steel Corp 高ゲーサイト鉱石の事前処理法
JPH07166248A (ja) * 1993-12-13 1995-06-27 Nkk Corp 焼成塊成鉱の製造方法
JP2012102371A (ja) * 2010-11-10 2012-05-31 Nippon Steel Corp 予熱原料を使用した直接還元炉の操業方法
JP2013133512A (ja) * 2011-12-27 2013-07-08 Jfe Steel Corp 高炉用原料の製造方法
JP2020020010A (ja) * 2018-08-02 2020-02-06 日本製鉄株式会社 高燐鉄鉱石の還元方法
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