[go: up one dir, main page]

WO2011138954A1 - Procédé de production de fer métallique - Google Patents

Procédé de production de fer métallique Download PDF

Info

Publication number
WO2011138954A1
WO2011138954A1 PCT/JP2011/060558 JP2011060558W WO2011138954A1 WO 2011138954 A1 WO2011138954 A1 WO 2011138954A1 JP 2011060558 W JP2011060558 W JP 2011060558W WO 2011138954 A1 WO2011138954 A1 WO 2011138954A1
Authority
WO
WIPO (PCT)
Prior art keywords
agglomerate
hearth
sio
forming material
amount
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/JP2011/060558
Other languages
English (en)
Japanese (ja)
Inventor
杉山　健
原田　孝夫
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to US13/696,412 priority Critical patent/US20130055853A1/en
Publication of WO2011138954A1 publication Critical patent/WO2011138954A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/008—Use of special additives or fluxing agents
    • 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

Definitions

  • an agglomerate made of a mixture containing an iron oxide source such as iron ore or iron oxide and a carbon-containing reducing agent is charged on the hearth of a moving hearth-type heating furnace and heated.
  • the present invention relates to a method for producing massive metallic iron by reducing iron oxide in a composition.
  • metallic iron A direct reduction iron manufacturing method has been developed.
  • the agglomerate formed from the raw material mixture is placed on the hearth of a moving hearth-type heating furnace, and heated in the furnace by gas heat transfer or radiant heat by a heating burner.
  • Iron oxide is reduced with a carbonaceous reducing agent to obtain massive metallic iron.
  • a part of the agglomerate is pulverized due to rolling, collision, drop impact or the like of the agglomerate.
  • the powder derived from the agglomerate is also charged when the agglomerate is charged on the hearth, and is deposited on the hearth to form a storage layer.
  • This accumulation layer is heated and reduced in the furnace in the same manner as the above agglomerates to produce metallic iron and wustite (FeO).
  • FeO metallic iron and wustite
  • the accumulation layer is discharged by a discharger (discharger).
  • Patent Document 1 As a method for preventing the formation of an iron plate on the hearth, reduced iron obtained by reducing the carbonaceous material-containing iron oxide agglomerate is moved out of the moving hearth type reduction furnace.
  • An operation method has been proposed in which a discharger (discharger) for discharging is provided and the position of the discharger that maintains a gap with the surface of the moving floor is adjusted. According to this technology, it is described that by providing a gap, it is possible to prevent the agglomerate-derived powder mixed into the furnace accompanying the agglomerate from being pushed into the hearth surface and to prevent the formation of a strong iron plate. Has been.
  • Patent Document 2 as a method for removing the fixed matter fixed on the hearth from the hearth surface, a crack was generated in the fixed matter fixed on the hearth by quenching the hearth surface of the rotary hearth type reduction furnace. Later, it has been proposed to remove the adherent from the hearth.
  • Patent Document 3 discloses that metal iron powder staying on the hearth and deposits on the hearth brick are removed, or metal iron powder remaining on the hearth is prevented and the surface of the hearth is always kept clean.
  • a method of maintaining a rotating bed furnace that can be used has been proposed. In this maintenance method, the reduced iron powder remaining on the hearth is removed from the hearth by blowing off with a jet gas flow between the reduced iron discharge part and the raw material charging part.
  • Japanese Patent No. 3075721 Japanese Patent Laid-Open No. 2002-12906 Japanese Patent Laid-Open No. 11-50120
  • Patent Documents 1 to 3 the design of the discharge device for discharging reduced iron to the outside of the moving hearth type reduction furnace, the provision of a new device for rapidly cooling the hearth surface, It is necessary to newly provide a device for blowing off the reduced iron powder, which requires a large capital investment.
  • the present invention has been made paying attention to the above-mentioned circumstances, and its purpose is to use an agglomerate made of a mixture containing an iron oxide-containing substance and a carbonaceous reducing agent as a raw material, and a moving hearth type heating furnace.
  • the iron oxide contained in the powder derived from the agglomerate without drastically changing the design of the equipment when reducing the iron oxide in the agglomerate and producing the metallic iron It is intended to provide a technique for preventing metallic iron and wustite produced by heat reduction of iron from adhering to the hearth.
  • the method for producing metallic iron according to the present invention which has solved the above problems, is an agglomerate (particle size is, for example, 5 to 50 mm) made from a mixture containing an iron oxide-containing substance and a carbonaceous reducing agent.
  • agglomerate particle size is, for example, 5 to 50 mm
  • metallic iron by charging iron oxide in the agglomerated material and heating it (eg, 1200-1400 ° C.) on the hearth of the moving hearth type heating furnace,
  • the main point is that a hearth forming material for preventing metallic iron and / or wustite formed by heat reduction of iron oxide contained in the powder from being fixed to the hearth together with the agglomerates is introduced into the furnace. is doing.
  • the total amount of CaO, SiO 2 , and Al 2 O 3 is 3.0 to 7.0 with respect to the component composition of the powder derived from the agglomerate and the hearth forming material. It is preferable to adjust the component composition of the hearth forming material so as to be%.
  • the total carbon content of the component composition of the powder and the hearth forming material is 122% or more based on the amount of carbon necessary for reducing iron oxide in the agglomerate, and is derived from the agglomerate
  • the composition of the hearth forming material so that the amounts of CaO, SiO 2 and Al 2 O 3 satisfy the following formulas (3) and (4): It is preferable to adjust the component composition.
  • [] represents the content (% by mass) of each component.
  • [CaO] / [SiO 2 ] 0.25 to 1.20
  • [Al 2 O 3 ] / [SiO 2 ] 0.2 to 0.7 (4)
  • the amount of carbon contained in the agglomerate is less than 122% with respect to the amount of carbon required for reducing iron oxide in the agglomerate, the agglomerate
  • the total carbon content of the component composition of the derived powder and the hearth-forming material remains below 122% with respect to the amount of carbon required to reduce the iron oxide in the agglomerate
  • the amount of CaO, SiO 2 , Al 2 O 3 , and MgO is at least one of the following formulas (5) to (9): It is preferable to adjust the component composition of the hearth forming material so as to satisfy.
  • [] represents the content (% by mass) of each component.
  • the total amount of CaO, SiO 2 , and Al 2 O 3 is more than 7.0% for the component composition of the powder derived from the agglomerate and the hearth forming material. It is preferable to adjust the component composition of the hearth forming material so that
  • the ratio of the hearth forming material having a particle diameter of 0.5 to 2 mm to the total amount of the hearth forming material charged in the furnace is preferably 50% by mass or more.
  • the hearth forming material since the hearth forming material is charged together with the agglomerate on the hearth of the moving hearth heating furnace, the iron oxide contained in the powder derived from the agglomerate is reduced by heating and generated. It is possible to prevent metallic iron and wustite that adhere to the hearth. For this reason, it is possible to prevent solid objects such as iron plates that cannot be discharged from the furnace from being formed on the hearth, and to raise the hearth surface, making it possible to efficiently use metallic iron without making major design changes. Can be manufactured well.
  • FIG. 1 is a graph showing the relationship between temperature and deformation rate when pellets are reduced by changing [MgO] / [SiO 2 ].
  • FIG. 2 is a drawing-substituting photograph in which a cross section of the reduced pellet is photographed.
  • FIG. 3 is a graph showing the results of measuring 40% shrinkage temperature by changing [MgO] / [SiO 2 ].
  • FIG. 4 is a graph showing the result of measuring 40% shrinkage temperature by changing [CaO] / [SiO 2 ].
  • FIG. 5 shows a SiO 2 —MgO—FeO ternary equilibrium diagram.
  • FIG. 6 shows a CaO—SiO 2 —MgO ternary equilibrium diagram.
  • Figure 7 shows a CaO-SiO 2 -Al 2 O 3 based ternary equilibrium diagram.
  • Patent Documents 1 to 3 require a significant design change of equipment and require a large capital investment. Therefore, the present inventors minimize the capital investment and prevent the iron oxide contained in the agglomerate-derived powder from being reduced by heating in the furnace to prevent the metallic iron and wustite from sticking to the hearth.
  • the present inventors minimize the capital investment and prevent the iron oxide contained in the agglomerate-derived powder from being reduced by heating in the furnace to prevent the metallic iron and wustite from sticking to the hearth.
  • solid objects such as iron plates that cannot be discharged from the furnace from being formed on the hearth and to raise the surface of the hearth. Has been repeated. As a result, it has been found that when the agglomerate is charged into the furnace, the hearth forming material may be charged into the furnace.
  • the agglomerate-derived The present invention has been completed by finding that the component composition of the hearth forming material may be appropriately adjusted and charged into the furnace so that the combined composition of the powder and the hearth forming material satisfies a predetermined condition. did.
  • the method for producing metallic iron according to the present invention includes a hearth forming material for preventing iron oxide and / or wustite formed by heat reduction of iron oxide contained in agglomerate-derived powder from being fixed on the hearth. Is characterized in that it is charged into the furnace together with the agglomerates.
  • the powder derived from the agglomerate that accumulates on the hearth is a powder that is charged into the furnace along with the agglomerate, and a powder that breaks down when the agglomerate is rapidly heated in the furnace.
  • the hearth-forming material and the powder derived from the agglomerate are placed on the hearth by charging the hearth-forming material together in the furnace.
  • iron oxide contained in the powder derived from the agglomerate is formed by heat reduction by appropriately adjusting the component composition of the hearth forming material in consideration of the component composition of the powder derived from the agglomerate. It is possible to prevent metallic iron and wustite from sticking to the hearth. Therefore, formation of fixed objects such as an iron plate and the occurrence of the rise of the hearth surface can be suppressed, and the production efficiency of metallic iron can be increased.
  • the time when the hearth forming material is added is before charging the agglomerate into the furnace, and preferably the time when the hearth forming material is added to the agglomerated material.
  • the hearth former before charging the agglomerate, for example, add the hearth former to the agglomerate on a conveyor that inserts the agglomerate into the hopper, and the agglomerates and hearths What is necessary is just to put these together on a hearth in the state which mixed the forming material.
  • the powder generated from the agglomerate and the fine hearth forming material accumulate in the lower part of the agglomerate, and are mixed and moved when the agglomerate is leveled by the leveler. .
  • the hearth forming material As the hearth forming material, a material that acts so as not to fix metal iron or wustite formed by heat reduction of iron oxide contained in the powder derived from the agglomerate on the hearth may be inserted. Specifically, paying attention to the amount of carbon contained in the agglomerate, this carbon amount is (a) 122% or more with respect to the amount of carbon necessary for reducing iron oxide in the agglomerate. Whether or not it is (b) less than 122%, the case may be divided and the component composition of the hearth forming material may be adjusted and charged into the furnace.
  • the amount of carbon contained in the agglomerate is 100% with respect to the amount of carbon required to reduce the iron oxide in the agglomerate, which means that the iron oxide in the agglomerate is excessive or insufficient. Not all (100%). Further, the fact that the amount of carbon is 122% of the amount of carbon necessary for reducing iron oxide in the agglomerate means that the amount of carbon is 22% excess, and this 22% The amount of carbon corresponds to about 5% of the amount of carbon remaining in the agglomerate after reduction.
  • the amount of carbon contained in the agglomerate and the amount of carbon necessary for reducing the iron oxide in the agglomerate can be calculated based on the component composition of the raw material mixture constituting the agglomerate.
  • the amount of carbon contained in the agglomerate after heat reduction of iron oxide in the agglomerate is, for example, 1300 ° C. in an inert atmosphere (for example, N 2 atmosphere) by placing the agglomerate in an electric furnace.
  • the amount of carbon remaining in the agglomerated material heated at (representative temperature) and having undergone the reduction reaction can be analyzed by infrared analysis. If the sum of this analytical value and the amount of carbon necessary for reducing the iron oxide in the agglomerate is calculated, the amount of carbon contained in the agglomerate before heating can be calculated backward.
  • the amount of carbon contained in the agglomerate is more than the required amount of carbon, and when carbon remains after heat reduction, the iron oxide contained in the agglomerate is almost completely reduced, Metallic iron produced by reduction becomes fine particles and exists in a state of being separated from each other. Moreover, since the carburization of metallic iron is accelerated
  • the present invention focuses on the slag produced as a by-product during the production of metallic iron and lowers the melting point of this slag to promote the aggregation of metallic iron and granulate.
  • the amounts of CaO, SiO 2 and Al 2 O 3 satisfy the above formulas (1) and (2).
  • the amount of carbon contained in the agglomerate is 122% or more with respect to the required amount of carbon, CaO, SiO 2 , and Al 2 for the component composition of the agglomerate-derived powder and the hearth-forming material It is preferable to adjust the component composition of the hearth forming material so that the total amount of O 3 is 3.0 to 7.0%.
  • the total amount of the above components is preferably 3.0% or more.
  • the total amount is more preferably 4.5% or more, still more preferably 5.0% or more.
  • the total amount is preferably 7.0% or less, and more preferably 6.5% or less.
  • the hearth forming material so that the total carbon content of the component composition of the agglomerate-derived powder and the hearth forming material is 122% or more with respect to the required carbon amount.
  • the amounts of CaO, SiO 2 , and Al 2 O 3 are the following formulas (3) and ( It is important to adjust the component composition of the hearth forming material so as to satisfy 4).
  • [] represents the content (% by mass) of each component.
  • [CaO] / [SiO 2 ] 0.25 to 1.20
  • [Al 2 O 3 ] / [SiO 2 ] 0.2 to 0.7 (4)
  • the amount of carbon contained in the agglomerate is less than 122% of the required amount of carbon, the amount of carbon tends to be insufficient, so a part of the iron oxide contained in the agglomerate-derived powder is reduced. For example, it may remain as wustite. Further, since the amount of carbon that contributes to carburizing of metallic iron is reduced, the granulation of metallic iron is not promoted, and plate-shaped metallic iron is easily generated.
  • a carbonaceous reducing agent is blended as a hearth forming material, and the amount of carbon contained in the agglomerate
  • the component composition of the hearth forming material is adjusted so that the total carbon content of the component composition of the powder derived from the agglomerate and the hearth forming material is 122% or more with respect to the required carbon amount. adjust.
  • the amount of CaO, SiO 2 , Al 2 O 3 satisfies the relationship of the above formulas (3) and (4) for the component composition of the agglomerate-derived powder and the hearth forming material. Need to be.
  • the above formulas (3) and (4) are the same formulas as the above formulas (1) and (2), and are defined based on the same knowledge. That is, the metal iron can be easily discharged out of the furnace by further reducing the granularity of the metal iron by lowering the melting point of the slag.
  • the total carbon content of the component composition of the agglomerate-derived powder and the hearth-forming material is kept below 122% with respect to the required carbon content
  • the amount of CaO, SiO 2 , Al 2 O 3 , and MgO is at least one of the following formulas (5) to (9): It is important to adjust the component composition of the hearth forming material so as to satisfy.
  • [] represents the content (% by mass) of each component.
  • No carbonaceous reducing agent is added as the hearth-forming material, and the total carbon content of the component composition of the agglomerate-derived powder and the hearth-forming material is kept below 122% of the required carbon content.
  • it is effective to appropriately control the composition of the gangue component.
  • solid gangue can be interposed between metallic iron and wustite particles, so the interval between metallic iron and wustite particles can be increased.
  • These aggregations can be suppressed.
  • metallic iron produced by reduction of iron oxide contained in the powder derived from the agglomerate is very fine and therefore has a very low mutual bonding force.
  • the melting point of the generated slag is lowered, and when molten slag is formed during the heating reduction, metallic iron existing in the vicinity thereof is formed.
  • the Fe atoms on the surface easily move, and the bonding between the metal irons is promoted to form a network-like metal iron bonding layer.
  • pressure is applied to the metallic iron bonding layer, a dense metallic iron plate (fixed matter) is formed, making it difficult to discharge out of the furnace.
  • the total carbon content of the combined composition of the powder derived from the agglomerate and the hearth forming material is 122% with respect to the required amount of carbon without adding a carbonaceous reducing agent as the hearth forming material.
  • the ratio is kept below, it is important to increase the melting point of by-product slag and suppress the formation of molten slag.
  • MgO has the effect
  • the MgO amount may be adjusted in consideration of the balance with the SiO 2 amount. .
  • [MgO] / [SiO 2 ] is preferably more than 0.4, thereby suppressing generation of molten slag and increasing solid slag.
  • [MgO] / [SiO 2 ] is more preferably 0.45 or more, and further preferably 0.5 or more.
  • the upper limit of [MgO] / [SiO 2 ] is, for example, 0.9.
  • the above formulas (5) to (9) need only satisfy at least one formula, and if at least one formula is satisfied, the melting point of by-product slag increases.
  • the amount of carbon contained in the agglomerate is less than 122% of the required carbon amount, and the total carbon amount of the component composition combining the powder derived from the agglomerate and the hearth forming material is required carbon.
  • the total amount of CaO, SiO 2 , and Al 2 O 3 is 7.0 with respect to the component composition of the powder derived from the agglomerate and the hearth forming material. It is preferable to adjust the component composition of the hearth forming material so as to exceed%.
  • the amount of gangue can be increased, so the amount of solid slag is increased, and it is possible to prevent metal iron and wustite from agglomerating and becoming coarse, and sticking to the hearth Can be prevented from being formed.
  • the total amount is more preferably 7.5% or more, and further preferably 8% or more.
  • the upper limit of the total amount is, for example, 10%.
  • CaO source SiO 2 source, Al 2 O 3 source
  • CaO source e.g., burnt lime (CaO) or limestone (main component CaCO 3) or the like can be used.
  • SiO 2 source for example, a mixture with other components such as silica sand or serpentine can be used.
  • Al 2 O 3 source for example, bauxite or a mixture with other components such as alumina-containing iron ore can be used.
  • MgO source for example, an Mg-containing material extracted from MgO-containing slag, seawater, or the like, or magnesium carbonate (MgCO 3 ), dolomite, or the like can be used.
  • the mass of the powder derived from the agglomerate is measured. There is a need.
  • powder II As a powder derived from agglomerates, after agglomerates are formed using a mixture containing an iron oxide-containing substance and a carbonaceous reducing agent as a raw material, a part of the agglomerates collapses or collapses due to impact or wear.
  • Generated powder hereinafter sometimes referred to as powder I
  • powder II powder produced by collapsing while the agglomerate is charged into the furnace and heated and reduced
  • the mass of the powder I is, for example, measuring the total mass of the agglomerate charged into the furnace, classifying the charge, and dividing the agglomerate into agglomerate-derived powder. What is necessary is just to measure the mass of the powder derived from a thing directly.
  • a powder having a particle diameter of 3 mm or less is defined as a powder.
  • the mass of the powder II is obtained by measuring the mass of a powder having a particle diameter of 3 mm or less that is generated when the agglomerate is heated in an electric furnace and rapidly heated (for example, a heating rate of 10 ° C./min or more).
  • the mass of the powder derived from the agglomerate may be predicted.
  • the component composition of the powder derived from the agglomerate and the hearth forming material can be expressed by the following formulas (21) to (24). It can.
  • L CaO , L SiO2 , L Al2O3 and L MgO are the proportions (mass%) of CaO, SiO 2 , Al 2 O 3 and MgO contained in the agglomerate, respectively.
  • W L represents the mass (kg) of the powder derived from the agglomerate charged into the furnace per unit time (hr).
  • C CaO , C SiO2 , C Al2O3 , and C MgO respectively indicate the ratio (mass%) of CaO, SiO 2 , Al 2 O 3 , and MgO contained in the CaO source contained in the hearth forming material.
  • L represents the mass (kg) of the CaO source contained in the hearth forming material charged into the furnace per unit time (hr).
  • S CaO , S SiO2 , S Al2O3 , and S MgO represent the ratio (mass%) of CaO, SiO 2 , Al 2 O 3 , and MgO contained in the SiO 2 source contained in the hearth forming material
  • SW L indicates the mass (kg) of the SiO 2 source contained in the hearth forming material charged into the furnace per unit time (hr).
  • a CaO , A SiO2 , A Al2O3 , and A MgO indicate the ratio (mass%) of SiO 2 , CaO, Al 2 O 3 , and MgO contained in the Al 2 O 3 source contained in the hearth forming material, respectively.
  • AW L represents the mass (kg) of the Al 2 O 3 source contained in the hearth forming material charged into the furnace per unit time (hr).
  • the target component composition is the following formulas (25) to (28), then based on the above formulas (21) to (24) Are represented by the following formulas (29) to (32).
  • a provisional numerical value is set for the SiO 2 source to be added, and the amount of other additives that achieve the target component ratio is determined. If the result does not reach the target value, the solution may be obtained by changing the amount of the SiO 2 source to be added.
  • the ratio of the hearth forming material having a particle diameter of 0.5 to 2 mm is preferably 50% by mass or more with respect to the total amount of the hearth forming material charged into the furnace.
  • the hearth forming material is easier to mix with the powder derived from the agglomerates when the particle diameter is smaller, but when the particle diameter is too small, when charging into the furnace or heating in the furnace, It will be blown by the wind pressure, and the desired effect will not be exhibited.
  • the ratio of the particle diameter of the hearth forming material to 0.5 mm or more is preferably 50% by mass or more.
  • the ratio of the particle diameter of the hearth forming material to 2 mm or less is preferably 50% by mass or more.
  • the agglomerates are formed from a raw material mixture containing an iron oxide-containing substance and a carbonaceous reducing agent.
  • an iron oxide-containing substance iron ore, iron sand, non-ferrous smelting residue, etc. may be used.
  • a carbonaceous reducing agent a carbon-containing material may be used. For example, coal or coke may be used.
  • a binder In the raw material mixture, a binder, an MgO source, or a CaO source may be blended as other components.
  • a binder polysaccharides (for example, starches, such as wheat flour) etc. can be used, for example.
  • MgO source or said CaO source what was illustrated as a MgO source or CaO source mix
  • the shape of the agglomerate is not particularly limited, and may be, for example, a pellet shape or a briquette shape.
  • the size of the agglomerate is not particularly limited, but the particle size (maximum diameter) may be 50 mm or less. The lower limit is about 5 mm. In addition, what is necessary is just to let a sphere equivalent diameter be a particle size when an agglomerate is briquette-like.
  • the above agglomerate may be heated in the furnace so that the temperature of the agglomerate is 1200 to 1400 ° C. to reduce iron oxide in the raw material mixture.
  • the type of furnace may be a moving hearth furnace, for example, a rotary hearth furnace.
  • the temperature of the agglomerate is particularly preferably 1250 ° C. or higher. If it is 1250 degreeC or more, the melting time of metallic iron and slag can be shortened. However, if the temperature of the agglomerate becomes too high, the metallic iron melts and bites into the hearth, causing a rise in the hearth.
  • a preferred upper limit for the temperature of the agglomerate is 1350 ° C.
  • the temperature of the agglomerate can be adjusted by using a burner and controlling the combustion conditions of the burner.
  • Experimental Example 1 an agglomerate made of a mixture containing an iron oxide-containing substance and a carbonaceous reducing agent is charged into a heating furnace and heated, and iron oxide in the raw material mixture is reduced to produce metallic iron.
  • the component composition and strength of metallic iron were examined, and the relationship between the adhesion to the hearth and the component composition was evaluated.
  • Experimental Example 2 the influence of CaO, SiO 2 , and MgO on the deformation rate of the agglomerate was examined, and the relationship between the component composition and the generation behavior of molten slag was evaluated.
  • Experimental Example 3 the relationship between the melting temperature of the slag component of Al 2 O 3 and the component was examined using a ternary phase diagram.
  • Example 1 The agglomerates having the component compositions shown in Table 1 below were produced as agglomerates using as a raw material a mixture containing an iron oxide-containing substance and a carbonaceous reducing agent.
  • the shape of the agglomerate is No. in Table 1 below.
  • Nos. 1, 6, and 7 are pillow briquettes (ball equivalent diameter (maximum diameter) is about 22 to 26 mm), 2 to 5 were spherical pellets (particle diameter (maximum diameter) was about 12 to 20 mm).
  • TFe is the total iron content
  • TC is the carbon content (in Table 1, the total carbon content contained in the agglomerate)
  • FC is the carbon content that is not gasified at 970 ° C.
  • Table 1 shows [CaO] / [SiO 2 ], [Al 2 O 3 ] / [SiO 2 ], [MgO] / [SiO 2 ], [CaO] + based on the agglomerate composition.
  • the values of [Al 2 O 3 ] + [SiO 2 ] are calculated and shown.
  • the obtained agglomerate was charged into a heating furnace and heated to 1300 ° C. to reduce iron oxide contained in the agglomerate to produce metallic iron.
  • the heating time in the furnace is shown in Table 2 below.
  • MFe is the amount of metallic iron
  • TC is the amount of carbon (in Table 2, the total amount of carbon remaining after heating)
  • TC / TFe ⁇ 100 is the ratio of the total amount of carbon to the total amount of iron
  • the strength of the massive metallic iron (agglomerated material) obtained after heating was measured by a rotational strength test.
  • ⁇ Rotational strength test ⁇ The residue was put in a rotating container and rotated at a total rotational speed of 500 rotations, and sieved in three stages: a particle diameter of 1 mm or less, a particle diameter of 1 mm to 2 mm or less, and a particle diameter of 2 mm or more.
  • the shape of the rotating container is a cylindrical shape having a diameter of 113 mm and a length of 205 mm, and two barrels are provided in the rotating container and are rotated at a rotation speed of 30 rpm.
  • the ratio of the powder having a particle diameter of 1 mm or less to the mass of the sieved powder is calculated and shown.
  • An increase in the proportion of powder having a particle diameter of 1 mm or less means that the residue is easily pulverized, indicating that the residue is not fixed on the hearth and the removability is good. ing.
  • the case where the ratio of the powder having a particle diameter of 1 mm or less is 29% or more is evaluated as being excellent in removability (invention example), and the case where it is less than 29% is evaluated as being inferior in removability (comparative example). .
  • no. 1, 2, 3, and 5 have a carbon content in the residue of 5% or more (that is, RCs / RedC ⁇ 100 value is 22% or more). This is an example of 122% or more with respect to the amount of carbon necessary for reducing iron oxide contained in the agglomerate.
  • No. 1, 2, and 3 have a [CaO] / [SiO 2 ] value of 0.25 to 1.20 and a [Al 2 O 3 ] / [SiO 2 ] value of 0 in the agglomerate composition. .2 to 0.7, which satisfies the above formulas (1) and (2). Therefore, the adherence to the hearth is reduced.
  • No. 5 has a value of [CaO] / [SiO 2 ] of 0.23 out of the component composition of the agglomerate, and does not satisfy the above formula (1).
  • the carbon content in the residue is less than 5% (that is, the value of RCs / RedC ⁇ 100 is less than 22%).
  • the amount is less than 122% with respect to the amount of carbon necessary for reducing the iron oxide contained in the composition.
  • No. 6 has a value of [CaO] / [SiO 2 ] of 0.14 out of the component composition of the agglomerate, which satisfies the above formula (5). Accordingly, the melting point of the slag is increased, the bonding force of the residue is lowered and the separation is facilitated, and the removability of the residue is improved.
  • Pellet (agglomerate) is prepared by blending iron ore containing SiO 2 as a gangue component with magnesite as the MgO source and limestone as the CaO source, and this is made in an electric furnace at 1300 ° C. for 10 minutes in the air. When heated and fired, and then gas-reduced, the deformation rate of the pellets during reduction was measured, and the results of examining the effects of CaO, SiO 2 and MgO on the deformation of the pellets were found as “High Temperature Reduction and Softening Properties of Pellets with Magnesite ”(Transactions of the Iron and Steel Institute of Japan, published by the Japan Iron and Steel Institute, vol. 23 (1983), No. 2, p153).
  • the temperature is raised to 1500 ° C.
  • the amount of SiO 2 in the pellet was set to 0.3%, and [MgO] / [SiO 2 ] was changed in the range of 0.01 to 1.32. It is shown in the literature. The result is shown in FIG.
  • FIG. 3 shows the results when the amount of SiO 2 is 4.4% ( ⁇ ) or 8.3% ( ⁇ ), CaO is not included, and [MgO] / [SiO 2 ] is changed. Yes.
  • FIG. 5 shows a SiO 2 —MgO—FeO ternary equilibrium diagram.
  • FIG. 6 shows a CaO—SiO 2 —MgO ternary equilibrium diagram.
  • Figure 7 shows a CaO-SiO 2 -Al 2 O 3 based ternary equilibrium diagram.
  • [Al 2 O 3 ] / [SiO 2 ] 0.2
  • [Al 2 O 3 ] / [SiO 2 ] 0.7
  • [CaO] / [SiO 2 ] 0.25
  • the region surrounded by the straight line is a region where a part of the low melting point slag having a melting point of about 1250 ° C. is generated. Therefore, it is considered that the amount of molten slag produced can be reduced if it is outside this region.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture Of Iron (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention divulgue une technique pour empêcher la fixation de fer métallique et/ou de wustite (qui est un matériau produit par la réduction thermique de l'oxyde de fer qui est contenu dans une poudre dérivée d'une masse agglomérée qui comprend, comme matière première, un mélange d'une substance contenant de l'oxyde de fer et d'un agent de réduction carboné) sur une sole d'un four de chauffage du type à sole mobile sans devoir changer profondément la conception d'une installation de production, pendant la production de fer métallique en plaçant la masse agglomérée sur la sole et en chauffant la masse agglomérée dans le four de chauffage afin de réduire l'oxyde de fer qui est contenu dans la masse agglomérée. Un matériau de formation de sole pour empêcher la fixation de fer métallique et/ou de wustite (qui est un matériau produit par la réduction thermique de l'oxyde de fer qui est contenu dans une poudre dérivée de la masse agglomérée) sur la sole est introduit dans le four de concert avec la masse agglomérée.
PCT/JP2011/060558 2010-05-06 2011-05-02 Procédé de production de fer métallique Ceased WO2011138954A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/696,412 US20130055853A1 (en) 2010-05-06 2011-05-02 Method for producing metallic iron

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010106659 2010-05-06
JP2010-106659 2010-05-06

Publications (1)

Publication Number Publication Date
WO2011138954A1 true WO2011138954A1 (fr) 2011-11-10

Family

ID=44903805

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/060558 Ceased WO2011138954A1 (fr) 2010-05-06 2011-05-02 Procédé de production de fer métallique

Country Status (3)

Country Link
US (1) US20130055853A1 (fr)
JP (1) JP2011252226A (fr)
WO (1) WO2011138954A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013227605A (ja) * 2012-04-24 2013-11-07 Kobe Steel Ltd 金属鉄含有焼結体
JP2014062321A (ja) * 2012-08-28 2014-04-10 Kobe Steel Ltd 還元鉄塊成物の製造方法
JP2014159622A (ja) * 2013-02-20 2014-09-04 Kobe Steel Ltd 還元鉄の製造方法
JP7255272B2 (ja) * 2019-03-25 2023-04-11 住友金属鉱山株式会社 ニッケル酸化鉱石の製錬方法、還元炉
JP7234768B2 (ja) * 2019-04-16 2023-03-08 日本製鉄株式会社 浸漬ノズルの予熱方法
JP7533375B2 (ja) * 2021-06-23 2024-08-14 Ｊｆｅスチール株式会社 還元用非焼成ペレットの製造方法
CN113684335B (zh) * 2021-09-07 2023-06-09 西安交通大学 一种金属铁及其制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1161215A (ja) * 1997-08-19 1999-03-05 Sumitomo Metal Ind Ltd 還元鉄製造原料の成形・装入装置および方法
JP2001279313A (ja) * 2000-03-30 2001-10-10 Midrex Internatl Bv 溶融金属鉄の製法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1187941B1 (fr) * 2000-03-30 2007-01-03 Kabushiki Kaisha Kobe Seiko Sho Procede de production de fer metallique
JP4757982B2 (ja) * 2000-06-28 2011-08-24 株式会社神戸製鋼所 粒状金属鉄の歩留まり向上方法
JP4669189B2 (ja) * 2001-06-18 2011-04-13 株式会社神戸製鋼所 粒状金属鉄の製法
JP4266284B2 (ja) * 2001-07-12 2009-05-20 株式会社神戸製鋼所 金属鉄の製法
JP4116874B2 (ja) * 2002-12-05 2008-07-09 株式会社神戸製鋼所 溶鉄の製法
TW200613566A (en) * 2004-10-29 2006-05-01 Kobe Steel Ltd Process for producing molten iron and apparatus therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1161215A (ja) * 1997-08-19 1999-03-05 Sumitomo Metal Ind Ltd 還元鉄製造原料の成形・装入装置および方法
JP2001279313A (ja) * 2000-03-30 2001-10-10 Midrex Internatl Bv 溶融金属鉄の製法

Also Published As

Publication number Publication date
US20130055853A1 (en) 2013-03-07
JP2011252226A (ja) 2011-12-15

Similar Documents

Publication Publication Date Title
JP5503420B2 (ja) 粒状金属の製造方法
JP2003073722A (ja) 粒状金属の製法
WO2011138954A1 (fr) Procédé de production de fer métallique
JP2002030319A (ja) 粒状金属鉄の製法
CA2720896C (fr) Agglomerat contenant de l'oxyde de titane pour la fabrication du fer metallique granulaire
WO2012002338A1 (fr) Procédé de production d'acier fondu à partir de particules de fer métallique
JP2010111941A (ja) フェロバナジウムの製造方法
JP5334240B2 (ja) 製鋼用還元鉄塊成鉱の製造方法
JP2010229525A (ja) フェロニッケルおよびフェロバナジウムの製造方法
JP5762403B2 (ja) 金属酸化物含有微細材料から高炉装入原料用凝集物を製造する方法
WO2011118738A1 (fr) Composition de briquette d'oxyde de fer contenant un matériau carboné, procédé de fabrication de cette dernière et procédé de fabrication du fer réduit à l'aide de cette dernière
JP2010189762A (ja) 粒状鉄の製造方法
JP2013209748A (ja) 還元鉄塊成物の製造方法
JP2009041107A (ja) 粒状金属の製法
JP5420935B2 (ja) 粒状金属鉄の製造方法
WO2009145348A1 (fr) Procédé de fabrication de fonte brute
JP2004183070A (ja) 溶鉄の製法
JP2010090431A (ja) ニッケルおよびバナジウムを含む合金鉄の製造方法
JP5498919B2 (ja) 還元鉄の製造方法
JP5210555B2 (ja) 粒状金属鉄の製造方法
JP5971482B2 (ja) 塊成鉱の製造方法
JP2010196148A (ja) 鉄原料およびその製造方法
JP5042203B2 (ja) 粒状金属鉄の製法
JP5671426B2 (ja) 粒状金属鉄の製造方法
JP5608144B2 (ja) 還元鉄の製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11777473

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 13696412

Country of ref document: US

122 Ep: pct application non-entry in european phase

Ref document number: 11777473

Country of ref document: EP

Kind code of ref document: A1