WO2010084822A1 - Procédé de production de fer granulaire - Google Patents

Procédé de production de fer granulaire Download PDF

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Publication number
WO2010084822A1
WO2010084822A1 PCT/JP2010/050373 JP2010050373W WO2010084822A1 WO 2010084822 A1 WO2010084822 A1 WO 2010084822A1 JP 2010050373 W JP2010050373 W JP 2010050373W WO 2010084822 A1 WO2010084822 A1 WO 2010084822A1
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Prior art keywords
iron
iron oxide
amount
gas
atmospheric gas
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PCT/JP2010/050373
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English (en)
Japanese (ja)
Inventor
杉山　健
修三 伊東
修 津下
晶一 菊池
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株式会社神戸製鋼所
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Application filed by 株式会社神戸製鋼所 filed Critical 株式会社神戸製鋼所
Priority to US13/142,368 priority Critical patent/US20110265603A1/en
Priority to CA2745763A priority patent/CA2745763A1/fr
Priority to AU2010207300A priority patent/AU2010207300B2/en
Priority to RU2011135038/02A priority patent/RU2484145C2/ru
Priority to CN201080004143XA priority patent/CN102272337A/zh
Publication of WO2010084822A1 publication Critical patent/WO2010084822A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
    • C21B13/105—Rotary hearth-type 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
    • C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0073—Selection or treatment of the reducing gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen

Definitions

  • the present invention introduces an agglomerate formed from a raw material mixture containing an iron oxide-containing substance and a carbonaceous reducing agent into a hearth laid with a carbonaceous material, and heats the agglomerate.
  • the present invention relates to a method for producing granular iron by reducing and melting iron oxide in a chemical compound.
  • Direct reduction iron making methods have been developed to obtain granular metallic iron from a raw material mixture containing an iron oxide source such as iron ore or iron oxide (hereinafter sometimes referred to as iron oxide-containing substance) and a carbonaceous reducing agent.
  • an iron oxide source such as iron ore or iron oxide (hereinafter sometimes referred to as iron oxide-containing substance) and a carbonaceous reducing agent.
  • the raw material mixture is charged onto the hearth of a heating furnace, and the iron oxide in the raw material mixture is reduced with a carbonaceous reducing agent by heating the raw material mixture with gas heat transfer or radiant heat in a furnace. It is reduced to iron, and this reduced iron is subsequently carburized and melted, then aggregated into granules while being separated from by-product slag, and then cooled and solidified to obtain granular metallic iron.
  • the content of impurity elements may be low. desired.
  • the carbon content in the granular iron is as large as possible within a range that does not become excessive.
  • Patent Document 1 granular iron in which the Fe purity is increased to 94% by mass or more and the C content is adjusted to 1.0 to 4.5% by mass. ing.
  • the granular iron is further adjusted to have an S content of 0.20 mass% or less, an Si content of 0.02 to 0.5 mass%, and an Mn content of less than 0.3 mass%.
  • Patent Document 1 does not disclose the point of adjusting the P amount of granular iron. The reason for this is that the phosphorus behavior in the reduction process of iron oxide has already been clarified by the chemical reaction mechanism in the blast furnace.
  • the present invention has been made in view of such a situation, and an agglomerate formed from a raw material mixture containing an iron oxide-containing substance and a carbonaceous reducing agent is charged on a hearth laid with a carbonaceous material.
  • An object of the present invention is to provide a method capable of producing granular iron with a low phosphorus content by reducing and melting iron oxide in the agglomerated material by heating the agglomerated material.
  • One aspect of the present invention is to charge an agglomerate formed from a raw material mixture containing an iron oxide-containing substance and a carbonaceous reducing agent onto a hearth laid with a carbonaceous material and heat the agglomerate.
  • the temperature of the agglomerated product in the furnace is in the range from 1200 ° C. to 1500 ° C.
  • the agglomerated product The oxygen partial pressure in the standard state of the atmospheric gas when the gas is heated is 2.0 ⁇ 10 ⁇ 13 atm or more, and the linear velocity of the atmospheric gas in the furnace is 4.5 cm / second or more. It is a manufacturing method.
  • FIG. 1 is a graph showing the relationship between the gas linear velocity and the dephosphorization rate under different oxygen partial pressures.
  • FIG. 2 is a graph showing the relationship between the gas linear velocity and the dephosphorization rate.
  • FIG. 3 is a graph showing the relationship between the oxygen partial pressure and the dephosphorization rate.
  • FIG. 4 is a graph showing the relationship between the time until removal and the dephosphorization rate.
  • FIG. 5 is a graph showing the relationship between the amount of fixed carbon contained in the carbonaceous reducing agent blended in the raw material mixture and the dephosphorization rate.
  • An agglomerate formed from a raw material mixture containing an iron oxide-containing substance and a carbonaceous reducing agent is placed on a hearth laid with a carbonaceous material, and the agglomerate is heated by heating the agglomerate.
  • the metallurgical process for producing granular iron by reducing and melting iron oxide is usually performed in a reducing atmosphere. The reason is that when this process is performed in an oxidizing atmosphere, the reduction of iron oxide contained in the agglomerate is stagnant during heating of the agglomerate, and reduced iron cannot be obtained in a high yield. Because. On the other hand, when this process is performed in a reducing atmosphere, the reduction of iron oxide proceeds.
  • the reduced iron when the reduced iron is melted in a reducing atmosphere, the phosphorus contained in the reduced iron hardly transfers to the slag produced as a by-product during the reduction, and remains in the granular iron obtained by melting the reduced iron. As a result, granular iron with a high phosphorus content is obtained.
  • the obtained granular iron In order to reduce the phosphorus content of the granular iron, the obtained granular iron needs to be supplied to, for example, an electric furnace and further subjected to dephosphorization treatment.
  • reducing gas from the carbonaceous reducing agent is actively generated from the inside of the agglomerated material while the iron oxide in the agglomerated material is reduced. Although it is released, almost no reducing gas is generated while the reduction of iron oxide is almost completed and the reduced iron melts and separates into granular iron and by-product slag. For this reason, the present inventors considered that the component composition of the granular iron while the reduced iron melts and separates into granular iron and by-product slag is greatly influenced by the component composition of the atmospheric gas.
  • the present inventors thought that the component composition of the granular iron could be adjusted by appropriately controlling the atmospheric gas while the reduced iron melts and separates into granular iron and by-product slag, and intensive studies are being conducted. Piled up. As a result, the inventors have (I) The agglomerated material is charged on a hearth laid with a carbonaceous material and heated so that the agglomerated material is in a range from 1200 ° C to 1500 ° C.
  • an agglomerated material As an agglomerated material, an agglomerated material mixture containing an iron oxide-containing substance and a carbonaceous reducing agent is prepared.
  • iron oxide-containing substance for example, iron ore, iron sand, non-ferrous smelting residue and the like can be used.
  • carbonaceous reducing agent for example, a carbon-containing substance can be used, and specifically, coal, coke, or the like can be used.
  • a binder, MgO supply substance, CaO supply substance, etc. can be mix
  • a binder for example, a polysaccharide (for example, starch such as wheat flour) can be used.
  • MgO supply substance for example, an Mg-containing substance extracted from MgO powder, natural ore, seawater, or the like, or magnesium carbonate (MgCO 3 ) can be used.
  • quick lime (CaO) or limestone (main component is CaCO 3 ) can be used as the CaO supply substance.
  • the shape of the agglomerated material is not particularly limited.
  • a pellet form or a briquette form can be adopted.
  • the size of the agglomerated material is not particularly limited. From the operational aspect, the particle size (maximum diameter) is preferably 50 mm or less, and preferably about 5 mm or more. If the particle size is large, the heat transfer to the lower part of the pellet is deteriorated, the productivity is lowered, and the granulation efficiency is also deteriorated. Therefore, it is preferable that it is 50 mm or less.
  • a charcoal material is laid on the hearth to reduce the agglomerates.
  • This carbon material serves as a carbon supply source when the carbon contained in the agglomerated material is insufficient, and also acts as a hearth protective material.
  • the charcoal material laid on the hearth has a maximum particle size of 2 mm or less.
  • a carbonaceous material having a maximum particle size of 2 mm or less it is possible to prevent the molten slag from flowing down the gaps in the carbonaceous material. As a result, it is possible to prevent the molten slag from reaching the hearth surface and eroding the hearth.
  • the lower limit value of the maximum particle size of the carbon material is preferably about 0.5 mm, for example.
  • the carbonaceous material is preferably laid on the hearth with a thickness of about 1 to 5 mm, for example.
  • the prepared agglomerated material is placed on a hearth laid with a carbonaceous material and heated so that the temperature of the agglomerated material becomes 1200 to 1500 ° C., and iron oxide in the raw material mixture is reduced and melted.
  • the temperature of the agglomerated material is preferably 1250 ° C. or higher. By setting it to 1250 degreeC or more, the fusion
  • the temperature of the agglomerated material is preferably 1450 ° C. or lower. By setting the temperature to 1450 ° C.
  • the structure of the heating furnace is not complicated, and a decrease in thermal efficiency can be suppressed. From the viewpoint of the structure of the heating furnace and the use of energy, it is preferable to produce the target metallic iron nugget at a low temperature.
  • a burner is used as the heating means in the furnace, the temperature of the agglomerated product can be adjusted by controlling the combustion conditions of the burner.
  • the kind of furnace used by this invention is not specifically limited.
  • a heating furnace or a moving hearth furnace can be used.
  • a moving hearth furnace for example, a rotary hearth furnace can be used.
  • the oxygen partial pressure in the standard state of the atmospheric gas when the agglomerate is heated is set to 2.0 ⁇ 10 ⁇ 13 atm or more, and the gas linear velocity is set to 4.5 cm / second or more.
  • the phosphorus contained in the reduced iron is oxidized by melting the reduced iron in a slightly oxidizing atmosphere, and this phosphorus migrates to the slag. This is because it has been found that the phosphorus content is reduced.
  • the oxygen partial pressure of the atmosphere gas is less than 2.0 ⁇ 10 ⁇ 13 atm or the gas linear velocity is less than 4.5 cm / sec, the oxidation contained in the atmosphere gas in the vicinity of the surface of the agglomerated material.
  • the oxygen partial pressure in the standard state of the atmospheric gas when the agglomerate is heated is 2.0 ⁇ 10 ⁇ 13 atm or more, and the gas linear velocity is 4.5 cm / second or more.
  • the oxygen partial pressure in the standard state of the atmospheric gas is preferably 2.8 ⁇ 10 ⁇ 13 atm or more.
  • the higher the oxygen partial pressure the more the granular iron dephosphorization is promoted.
  • the oxygen partial pressure in the standard state is preferably 4.8 ⁇ 10 ⁇ 13 atm or less, and more preferably 4.0 ⁇ 10 ⁇ 13 atm or less.
  • the linear velocity of the atmospheric gas in the furnace is preferably 5 cm / second or more. As the gas linear velocity increases, the dephosphorization of granular iron is promoted. However, if the gas linear velocity becomes too high, the granular iron is re-oxidized and the iron yield is lowered. Therefore, the gas linear velocity is preferably 13.5 cm / second or less, and more preferably 9 cm / second or less.
  • the atmospheric gas when the agglomerated material is heated means an atmospheric gas near the surface of the agglomerated material.
  • the vicinity of the surface of the agglomerated product means a region from the surface of the agglomerated product to a height of 50 mm.
  • the oxygen partial pressure and gas linear velocity of the atmospheric gas in the furnace are often different below the furnace (near the hearth) and above (near the ceiling), so agglomerates that affect the redox reaction of the agglomerates. It is necessary to define the oxygen partial pressure and the gas linear velocity for the atmospheric gas in the vicinity of the surface.
  • the oxygen partial pressure of the atmospheric gas when the agglomerated material is heated can be calculated by collecting the atmospheric gas near the surface of the agglomerated material and analyzing the gas composition.
  • the linear velocity of the atmospheric gas can be measured using a peat tube or the like.
  • the oxygen partial pressure of the atmospheric gas can be controlled, for example, by adjusting the amount of oxygen supplied to the burner, adjusting the amount of fuel supplied to the burner, the air ratio, etc., or adjusting the blowing of reducing gas.
  • the linear velocity of the atmospheric gas can be controlled, for example, by adjusting the amount of gas supplied to the burner, adjusting the blowing angle of the burner, or changing the height of the ceiling.
  • the oxygen partial pressure and the gas linear velocity of the atmospheric gas are adjusted so that they are within the above ranges after the time when the reduced iron starts melting at the latest. This is because the component composition of granular iron is affected by the atmospheric gas composition at the time of melting rather than at the time of solid reduction.
  • the linear velocity of the atmospheric gas when the agglomerated material is heated is controlled to 5.4 cm / second or less (including 0 cm / second), and melting starts. After that, it is preferable to control the linear velocity of the atmospheric gas when the agglomerated material is heated to 4.5 cm / second or more.
  • the reduction reaction takes place actively in the agglomerate, so even if the composition of the atmospheric gas in the furnace is changed, the agglomerate or near the surface of the agglomerate It is difficult to change the composition of the atmospheric gas.
  • solid reduction approaches completion carburization into iron begins, the melting point of iron decreases, and melting begins.
  • the oxygen partial pressure of the atmospheric gas until the iron oxide contained in the raw material mixture starts to melt is preferably 2.8 ⁇ 10 ⁇ 13 atm or less.
  • the partition plate may be suspended from the ceiling in the furnace to divide the furnace into a plurality of zones, and the oxygen partial pressure and gas linear velocity of the atmospheric gas may be controlled in each zone.
  • the dephosphorization of granular iron can be promoted more effectively than reductive melting in a reducing atmosphere. It is possible to produce granular iron with a low phosphorus content.
  • the fixed carbon amount contained in the carbonaceous reducing agent to be blended in the raw material mixture with respect to the fixed carbon amount necessary for reducing the iron oxide contained in the iron oxide-containing substance is 98% by mass to 102% by mass. It is preferable to set it as the range. The reason is that if the amount of fixed carbon contained in the carbonaceous reducing agent relative to the amount of fixed carbon necessary for reducing iron oxide is less than 98% by mass, the carbon is insufficient and, as will be described later, it is laid on the hearth. This is because even if reducing gas (CO gas) springs out from the carbonaceous material, the reduction of iron oxide is insufficient.
  • CO gas reducing gas
  • the amount of fixed carbon contained in the carbonaceous reducing agent relative to the amount of fixed carbon necessary for reducing iron oxide is preferably 98% by mass or more, and more preferably 98.5% by mass or more.
  • the reducing gas CO gas
  • the fixed carbon amount contained in the carbonaceous reducing agent with respect to the fixed carbon amount required for reducing iron oxide is preferably 102% by mass or less, more preferably 101% by mass or less.
  • the amount of fixed carbon contained in the carbonaceous reducing agent it is particularly recommended to adjust the amount of fixed carbon contained in the carbonaceous reducing agent to be slightly deficient with respect to the amount of fixed carbon necessary for reducing iron oxide.
  • the reason is that when the amount of fixed carbon contained in the carbonaceous reducing agent is insufficient, the reduction of granular iron seems to be insufficient, but in the present invention, the agglomerate is located on the carbonaceous material, so This is because the unreduced portion of iron is reduced by the carbon material laid on the hearth.
  • iron oxide (FeO x ) contained in the agglomerated material is reduced by the following formulas (1) and (2) using carbon (C) contained in the carbonaceous reducing agent and carbon material laid on the hearth. Is reduced to form granular iron.
  • FeO x + xCO ⁇ Fe + xCO 2 (1)
  • the amount of carbon when calculated as one carbon atom necessary for reducing one oxygen atom contained in iron oxide is slightly insufficient because, for example, a carbonaceous reducing agent is blended in the raw material mixture in a small amount. Even if there is, the iron oxide in the agglomerates is sufficiently reduced.
  • the amount of fixed carbon contained in the carbonaceous reducing agent is adjusted to be deficient with respect to the amount of fixed carbon necessary for reducing iron oxide, so that iron oxide (FeO) contained in the by-product slag during reduction is reduced. ) Can be produced more, and the dephosphorization reaction when the reduced iron is melted can be promoted. Therefore, the amount of fixed carbon contained in the carbonaceous reducing agent with respect to the amount of fixed carbon necessary for reducing iron oxide is more preferably 100% by mass or less.
  • the amount of fixed carbon contained in the carbon material laid on the hearth is not particularly limited.
  • a carbon-containing material used as the carbonaceous reducing agent can be used.
  • the composition of the raw material mixture so that the agglomerate has a basicity of slag by-produced during the reduction of iron oxide in the range of 1.0 to 1.6.
  • the basicity is preferably 1.3 or more, and more preferably 1.4 or more.
  • the basicity of the slag becomes too high, the melting point of the slag becomes too high, and when the reduced iron is melted, the slag is not melted, so that the separation between the granular iron and the slag is deteriorated. As a result, slag is caught in granular iron, and the quality of granular iron falls. Accordingly, the basicity is preferably 1.6 or less.
  • the basicity of slag is a value [(CaO) / (SiO 2 )] calculated from the amount of CaO and the amount of SiO 2 contained in the slag.
  • each agglomerate formed from a raw material mixture containing an iron oxide-containing substance and a carbonaceous reducing agent was produced in a laboratory, and each agglomerate was heated in a furnace of a carbonaceous material.
  • Each granular iron was manufactured by charging into the floor and heating the agglomerated material to reduce and melt the iron oxide in the agglomerated material.
  • the composition of the agglomerated material and the reducing and melting conditions were variously changed. Specifically, it is as follows.
  • iron oxide-containing substance two types of iron ore (n) having a low phosphorus content and iron ore (hpb) having a high phosphorus content were used.
  • the component composition of iron ore (n) and iron ore (hpb) is shown in Table 1 below.
  • carbonaceous reducing agent two kinds of coal (p) having a low phosphorus content and coal (b) having a high phosphorus content were used.
  • the component composition of coal (p) and coal (b) is shown in Table 2 below.
  • Additives were blended into the iron ore shown in Table 1 below and the coal shown in Table 2 below, and pelletized agglomerates (test materials) having a particle size of 18 to 20 mm were prepared.
  • the blended additives are wheat flour added as a binder, MgO, CaO, and the like.
  • Table 3 below shows the composition of the test material (percentage of the weighed value).
  • Table 3 below shows percentage target values of the amount of fixed carbon contained in the carbonaceous reducing agent blended in the raw material mixture with respect to the amount of fixed carbon necessary for reducing iron oxide.
  • Table 3 below shows target values of basicity of slag produced as a by-product during reduction.
  • Table 4 below shows the component composition of the test materials.
  • the test material (1) is a low phosphorus content pellet
  • the test materials (2) to (5) are high phosphorus content pellets.
  • test materials shown in Table 4 below are charged into the furnace of the hearth where each charcoal material is laid, and the iron oxide in the raw material mixture is reduced and melted by heating, and the granular iron and slag are completely The product was taken out into the cooling zone at the time when it was separated, and each granular iron was produced.
  • the number of specimens charged into the furnace was 30.
  • 130 g of anthracite having a maximum particle size of 2 mm or less was spread as a charcoal material. A large amount of charcoal was laid around to protect the hearth.
  • the test material charged in the furnace was heated so that the temperature of the test material became 1450 ° C. using a heater provided in the furnace.
  • the linear velocity of the atmospheric gas when the specimen is heated (the linear velocity of the atmospheric gas in the vicinity of the specimen) is controlled in the range of 1.35 to 20.27 cm / sec.
  • the oxygen partial pressure of the atmospheric gas during heating (the oxygen partial pressure of the atmospheric gas in the vicinity of the specimen) was controlled in the range of 0 to 5.057 ⁇ 10 ⁇ 13 atm.
  • the gas linear velocity and oxygen partial pressure are shown in Table 5 or Table 6 below.
  • the gas linear velocity is a value in a standard state.
  • the gas linear velocity was calculated from the amount of gas supplied and the cross-sectional area at the sample installation part in the furnace.
  • the oxygen partial pressure was calculated by the following procedure.
  • the component composition of the obtained granular iron and the component composition of the slag produced as a by-product when the granular iron is generated are shown in Tables 5 and 6 below.
  • the amount of Fe shows a calculated value obtained by subtracting the alloy elements and the amount of impurities from the whole (100% by mass).
  • No. No. 30 shows the result of taking out the granular iron 1 minute earlier than the time when separation of the slag and granular iron is completed.
  • 31 shows the result of taking out granular iron from the furnace after hold
  • No. 30 and no. Samples other than 31 show the results of taking out granular iron from the furnace when one minute has passed since the separation of slag and granular iron was completed.
  • the center temperature of the test material When the center temperature of the test material is measured, it is about 1300 ° C. (No. 30) at a point one minute earlier than the separation of slag and granular iron, and 1 after the separation of slag and granular iron is completed.
  • the temperature was about 1400 ° C. when a minute elapsed, and about 1450 ° C. (No. 31) when held for 3 minutes after the separation of slag and granular iron was completed.
  • the CO 2 gas fraction in the vicinity of the specimen is from 1 minute earlier than the separation of slag and granular iron to the point of holding for 3 minutes after the separation of slag and granular iron is completed.
  • CO gas from the test material was slightly observed at one minute earlier than the separation of slag and granular iron, but after the separation of slag and granular iron was partially completed, No CO gas was detected from the specimen.
  • the phosphorus removal rate was calculated by the following formula.
  • FIG. 1 Based on the data in Tables 4 and 5, the relationship between the gas linear velocity and the dephosphorization rate under different oxygen partial pressures is shown in FIG.
  • the symbol ⁇ indicates the result when the oxygen partial pressure is 0 atm
  • the symbol ⁇ indicates the result when the oxygen partial pressure is 1.011 ⁇ 10 ⁇ 13 atm
  • the symbol ⁇ indicates the oxygen partial pressure is 1.517 ⁇ 10 ⁇ 13 atm.
  • the symbol ⁇ indicates the result when the oxygen partial pressure is 3.034 ⁇ 10 ⁇ 13 atm
  • the symbol ⁇ indicates the result when the oxygen partial pressure is 5.057 ⁇ 10 ⁇ 13 atm.
  • the dephosphorization rate increases as the linear velocity of the atmosphere gas when the specimen is heated is increased. Then, for example, in a gas linear velocity 5.41Cm / sec test material (3), increasing the partial pressure of oxygen in the atmosphere gas from 1.517 ⁇ 10 -13 atm to 3.034 ⁇ 10 -13 atm. It can be seen that when the oxygen partial pressure of the atmospheric gas is increased, the phosphorus removal rate increases with the same specimen and the same gas linear velocity so that the phosphorus removal rate increases. When the oxygen partial pressure of the atmospheric gas is 0 atm (that is, in a nitrogen gas atmosphere), the phosphorus removal rate is not affected by the gas linear velocity.
  • FIG. 3 shows the relationship between the oxygen partial pressure and the dephosphorization rate for 25, 27, 28, and 29.
  • the dephosphorization rate increases as the oxygen partial pressure increases. It can also be seen that the dephosphorization rate hardly changes when the oxygen partial pressure is up to 1.517 ⁇ 10 ⁇ 13 atm.
  • FIG. 4 shows the time when the reduced iron is melted and the time when the slag and the granular iron are completely separated is 0 minute, and the time from when the granular iron separated from the slag is taken out of the furnace is changed. Shows the change in the dephosphorization rate. As is apparent from FIG. 4, it can be seen that the dephosphorization rate decreases when heating is continued as it is after the slag and granular iron are separated.
  • the highest dephosphorization rate is when the removal time is “ ⁇ 1 minute”. This “ ⁇ 1 minute” means that the slag and granular iron were removed from the furnace before they were separated. This is a condition that cannot be adopted in actual operation.
  • FIG. 5 shows the relationship between the amount of fixed carbon contained in the carbonaceous reducing agent blended in the raw material mixture and the dephosphorization rate for 21, 22, and 25.
  • the amount of fixed carbon contained in the carbonaceous reductant blended in the raw material mixture is insufficient relative to the amount of fixed carbon necessary for reducing iron oxide. It can be seen that the phosphorus rate is higher.
  • the amount of fixed carbon contained in the carbonaceous reducing agent to be blended in the raw material mixture is insufficient with respect to the amount of fixed carbon necessary for reducing the iron oxide contained in the test material.
  • the amount of carbon contained in the charcoal laid on the hearth is adjusted to a range of 2 to 5% by mass with respect to the amount of fixed carbon required to reduce iron oxide. It can be seen that the remaining iron oxide is stably reduced by the carbon material laid on the hearth.
  • one aspect of the present invention is to charge an agglomerate formed from a raw material mixture containing an iron oxide-containing substance and a carbonaceous reducing agent onto a hearth laid with a carbonaceous material,
  • the oxygen partial pressure in the standard state of the atmospheric gas when the agglomerated material is heated is 2.0 ⁇ 10 ⁇ 13 atm or more, and the linear velocity of the atmospheric gas in the furnace is 4.5 cm. It is the manufacturing method of the granular iron which makes it / second or more.
  • the agglomerated material after the reduction is melted in a state where the oxygen partial pressure and the gas linear velocity of the atmospheric gas are controlled to the above conditions, so that the phosphorus contained in the reduced iron is transferred to the slag produced as a by-product during the reduction. be able to. As a result, the amount of phosphorus contained in the granular iron obtained by melting reduced iron is reduced.
  • the amount of fixed carbon contained in the carbonaceous reducing agent with respect to the amount of fixed carbon necessary for reducing the iron oxide is in a range from 98% by mass to 102% by mass. It is preferable to adjust the composition of the raw material mixture. Thereby, the reduction reaction of iron oxide proceeds more actively, and granular iron with less phosphorus content is obtained.
  • the composition of the raw material mixture so that the basicity of slag produced as a by-product during reduction of the iron oxide is in the range of 1.0 to 1.6.
  • the dephosphorization reaction proceeds faster, and granular iron having a lower phosphorus content is obtained.
  • the amount of fixed carbon contained in the carbonaceous reducing agent with respect to the amount of fixed carbon necessary for reducing the iron oxide is in a range from 98% by mass to 100% by mass. Is preferred.
  • the amount of fixed carbon contained in the carbonaceous reducing agent becomes insufficient with respect to the amount of fixed carbon necessary for reducing iron oxide, and the amount of iron oxide (FeO) contained in the byproduct slag during reduction is reduced. Many can be generated.
  • the dephosphorization reaction at the time of melting of the reduced iron is further promoted, so that the dephosphorization rate of the reduced iron can be further increased.
  • the linear velocity of the atmospheric gas is set to 5.4 cm / second or less (including 0 cm / second), and the iron oxide starts melting.
  • the linear velocity of the atmospheric gas is preferably 4.5 cm / second or more.
  • the amount of fixed carbon contained in the carbonaceous material laid on the hearth with respect to the amount of fixed carbon necessary for reducing the iron oxide ranges from 2% by mass to 5% by mass.
  • the maximum particle size of the carbon material is preferably 2 mm or less.
  • the method for producing granular iron of the present invention it is possible to stably produce granular iron with a low phosphorus content.

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Abstract

L'invention concerne un procédé de production de fer granulaire, qui consiste à : introduire des agglomérats formés à partir d'un mélange de matériaux bruts comprenant une substance qui contient un oxyde de fer et un agent de réduction carboné sur un four sur lequel matériau à base de charbon est déposé, et à chauffer les agglomérats afin de réduire et de fondre l'oxyde de fer contenu dans les agglomérats, caractérisé en ce que : la température des agglomérats dans le four est régulée dans une plage comprise entre 1200 et 1500°C ; la pression partielle de l'oxygène du gaz atmosphérique lorsque les agglomérats sont chauffés étant réglée à 2,0 × 10-13 atm ou plus en termes de valeur à un état standard ; et la vitesse linéaire du gaz atmosphérique dans le four étant réglée à 4,5cm/s ou plus.
PCT/JP2010/050373 2009-01-23 2010-01-15 Procédé de production de fer granulaire WO2010084822A1 (fr)

Priority Applications (5)

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US13/142,368 US20110265603A1 (en) 2009-01-23 2010-01-15 Method for producing granular iron
CA2745763A CA2745763A1 (fr) 2009-01-23 2010-01-15 Procede de production de fer granulaire
AU2010207300A AU2010207300B2 (en) 2009-01-23 2010-01-15 Process for manufacturing granular iron
RU2011135038/02A RU2484145C2 (ru) 2009-01-23 2010-01-15 Способ производства гранулированного железа
CN201080004143XA CN102272337A (zh) 2009-01-23 2010-01-15 粒状铁的制造方法

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JP2009013378 2009-01-23
JP2009-013378 2009-01-23

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JP (1) JP2010189762A (fr)
CN (1) CN102272337A (fr)
AU (1) AU2010207300B2 (fr)
CA (1) CA2745763A1 (fr)
RU (1) RU2484145C2 (fr)
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RU2820696C1 (ru) * 2023-09-22 2024-06-07 Федеральное государственное бюджетное учреждение науки Институт металлургии Уральского отделения Российской академии наук (ИМЕТ УрО РАН) Способ переработки магнийсодержащих карбонатных железорудных материалов

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JP6294152B2 (ja) * 2014-05-15 2018-03-14 株式会社神戸製鋼所 粒状金属鉄の製造方法
JP6250482B2 (ja) * 2014-06-13 2017-12-20 株式会社神戸製鋼所 粒状金属鉄の製造方法
JP6460531B2 (ja) * 2015-05-28 2019-01-30 株式会社神戸製鋼所 還元鉄の製造方法
JP7388594B2 (ja) 2021-11-30 2023-11-29 Ｊｆｅスチール株式会社 金属鉄の製造方法
JP7476872B2 (ja) 2021-11-30 2024-05-01 Ｊｆｅスチール株式会社 金属の製造方法
JP7476871B2 (ja) 2021-11-30 2024-05-01 Ｊｆｅスチール株式会社 金属の製造方法

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RU2820696C1 (ru) * 2023-09-22 2024-06-07 Федеральное государственное бюджетное учреждение науки Институт металлургии Уральского отделения Российской академии наук (ИМЕТ УрО РАН) Способ переработки магнийсодержащих карбонатных железорудных материалов

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US20110265603A1 (en) 2011-11-03
AU2010207300A1 (en) 2011-06-23
CN102272337A (zh) 2011-12-07
JP2010189762A (ja) 2010-09-02
AU2010207300B2 (en) 2013-05-09
RU2011135038A (ru) 2013-02-27
CA2745763A1 (fr) 2010-07-29

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