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WO2012032927A1 - Procédé de production de fer réduit - Google Patents

Procédé de production de fer réduit Download PDF

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Publication number
WO2012032927A1
WO2012032927A1 PCT/JP2011/068970 JP2011068970W WO2012032927A1 WO 2012032927 A1 WO2012032927 A1 WO 2012032927A1 JP 2011068970 W JP2011068970 W JP 2011068970W WO 2012032927 A1 WO2012032927 A1 WO 2012032927A1
Authority
WO
WIPO (PCT)
Prior art keywords
cementite
iron oxide
iron
reducing agent
containing material
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/JP2011/068970
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English (en)
Japanese (ja)
Inventor
雅孝 立石
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 CN2011800352344A priority Critical patent/CN103003452A/zh
Publication of WO2012032927A1 publication Critical patent/WO2012032927A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing 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
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C21B13/0026—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide in the flame of a burner or a hot gas stream
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B15/00—Other processes for the manufacture of iron from iron compounds
    • 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

  • an iron oxide source such as iron ore or iron oxide and a reducing agent containing carbon are mixed, and the agglomerate obtained by agglomerating the mixture is charged in a furnace and heated.
  • the present invention relates to a method for producing reduced iron by reducing iron oxide.
  • an iron oxide source such as iron ore or iron oxide
  • a carbon-containing reducing agent hereinafter sometimes referred to as a carbonaceous reducing agent
  • Direct reduction iron manufacturing methods for producing iron have been developed.
  • the agglomerate formed from the above mixture is charged into a furnace, and the iron oxide in the agglomerate is reduced with a carbonaceous reducing agent by heating in the furnace with gas heat transfer or radiant heat by a heating burner.
  • reduced iron can be obtained (Patent Document 1).
  • the iron oxide in the agglomerate is quickly reduced with a carbonaceous reducing agent in order to improve productivity. It is desirable to dissolve.
  • the melting zone in the furnace it is usually heated to about 1400-1500 ° C. From the viewpoint of energy saving, it is desired to increase the thermal efficiency by setting the temperature of the melting zone to a temperature lower than, for example, 1400 ° C.
  • the present invention has been made by paying attention to such circumstances, and its purpose is to promptly convert iron oxide when producing reduced iron from an agglomerate containing an iron oxide-containing substance and a carbonaceous reducing agent.
  • An object of the present invention is to provide a method for producing a reduced melting accelerator capable of improving the productivity of reduced iron by reducing melting, and further producing a reduced iron with high productivity using this reduced melting accelerator.
  • the iron oxide-containing substance, the carbonaceous reducing agent, and the oxidizing agent are heated to 400 to 900 ° C. to produce a cementite-containing material.
  • the step of generating the cementite-containing material is referred to as the first step.
  • the method for producing reduced iron according to the present invention comprises mixing a cementite-containing material obtained in the first step, an iron oxide-containing material and a carbonaceous reducing agent, and agglomerating the agglomerated material.
  • a furnace is charged and heated to reduce iron oxide in the agglomerate.
  • 2nd process the process which manufactures reduced iron is called 2nd process.
  • cementite-containing iron component separated from the cementite-containing material is mixed with the iron oxide-containing substance and the carbonaceous reducing agent in the second step.
  • the cementite-containing iron content can be separated by, for example, magnetic separation and / or specific gravity separation.
  • the reaction gas produced as a by-product in the process of producing the cementite-containing material is preferably separated into a gas component and a tar component.
  • This tar content can be used as at least part of the carbonaceous reducing agent.
  • water vapor can be used as the oxidizing agent. It is recommended that the steam be generated using waste heat generated in the furnace.
  • an oxygen-containing gas or carbon dioxide gas can be used as the oxidizing agent.
  • an oxygen-containing gas or carbon dioxide gas can be used as the oxidizing agent.
  • carbon dioxide gas for example, exhaust gas from the furnace can be used.
  • the cementite-containing material is generated by heating the iron oxide-containing substance, the carbonaceous reducing agent, and the oxidizing agent, and the cementite-containing material promotes the reduction melting of the iron oxide to reduce the reduced iron.
  • This contributes to improving the productivity. That is, by using the cementite-containing material as a raw material for the agglomerated material, the cementite-containing material promotes the reductive melting of iron oxide in the agglomerated material, and as a result, the productivity of reduced iron can be improved.
  • Drawing 1 is a figure for explaining a process when manufacturing reduced iron.
  • FIG. 2 is a graph showing the relationship between temperature (° C.) and CO gas partial pressure ratio with respect to the total pressure of CO gas and CO 2 gas.
  • the inventors of the present invention have made extensive studies in order to improve the productivity of reduced iron when producing reduced iron by heating an agglomerate containing an iron oxide-containing substance and a carbonaceous reducing agent.
  • the cementite-containing material can be easily produced by heating the iron oxide-containing substance, the carbonaceous reducing agent, and the oxidizing agent, and the reduced iron production can be achieved by blending this cementite-containing material as a raw material for the agglomerate.
  • the present invention has been completed.
  • the present invention is characterized in that as a first step, an iron oxide-containing substance, a carbonaceous reducing agent, and an oxidizing agent are heated to 400 to 900 ° C. to generate a cementite-containing substance.
  • the cementite-containing material obtained in the first step, the iron oxide-containing material and the carbonaceous reducing agent are mixed, and the agglomerate obtained by agglomerating this is used in the furnace. It is characterized in that it is charged and heated to reduce the iron oxide in the agglomerate.
  • a cementite-containing material is generated, and in the second step, the cementite-containing material is mixed with an iron oxide-containing material and a carbonaceous reducing agent, so that the iron oxide contained in the agglomerate is conventionally reduced. Can also be melted at low temperatures. As a result, the productivity of reduced iron can be improved.
  • the reason why the melting of iron oxide is promoted by blending the cementite-containing material is that the melting point of cementite is lower than that of pure iron.
  • FIG. 1 shows a process diagram for producing reduced iron.
  • 1 is an iron oxide-containing substance supply means
  • 2 is a carbonaceous reducing agent supply means
  • 3 is an oxidant supply means
  • 4 is a heating furnace
  • 5 is a mixer
  • 6 is an iron oxide-containing substance supply means
  • 7 is A carbonaceous reducing agent supply means
  • 8 is an agglomeration machine
  • 9 is a heating furnace.
  • the iron oxide-containing substance supply means 1 and the heating furnace 4 are connected by a path 100a, the carbonaceous reducing agent supply means 2 and the heating furnace 4 are connected by a path 100b, and the oxidant supply means 3 and the heating furnace 4 are connected by a path 100c.
  • the heating furnace 4 and the mixer 5 are connected by a path 101.
  • the heating furnace 4 is connected to the scrubber 10 via a path 108, and this scrubber 10 is connected to the heating furnace 9 via a path 109, and the carbonaceous reducing agent supply means 7 via the path 110. It is connected.
  • a hopper (supply means) for supplying the cementite-containing material obtained in the heating furnace 4 to the mixer 5 is provided at the outlet of the heating furnace 4 (not shown).
  • the mixer 5 is connected to the iron oxide-containing substance supply means 6 via a path 106 and to the carbonaceous reducing agent supply means 7 via a path 107.
  • the mixer 5 and the agglomerator 8 are connected by a path 102, and the agglomerator 8 and the heating furnace 9 are connected by a path 103, respectively. Reduced iron produced in the heating furnace 9 is discharged from the path 104.
  • iron oxide-containing substance supply means iron oxide-containing substance supply means 1 and 6
  • carbonaceous reductant supply means 2 and 7 carbonaceous reductant supply means 2 and 7.
  • the iron oxide-containing substance supply means and the carbonaceous reductant supply means may be configured to serve as one by one.
  • the procedure for producing reduced iron is as follows (1) and (2).
  • an iron oxide-containing substance, a carbonaceous reducing agent, and an oxidizing agent are supplied to the heating furnace 4 through the paths 100a to 100c and heated.
  • the cementite-containing material obtained by heating in the heating furnace 4 is supplied to the mixer 5 through the path 101.
  • the mixer 5 is supplied with the iron oxide-containing substance from the iron oxide-containing substance supply means 6 through the path 106 and is supplied with the carbonaceous reducing agent from the carbonaceous reducing agent supply means 7 through the path 107.
  • the mixture obtained by mixing in the mixer 5 is supplied to the agglomerator 8 through the path 102 and agglomerated.
  • the agglomerate obtained by agglomeration by the agglomerator 8 is supplied to the heating furnace 9 through the path 103 and heated to produce reduced iron.
  • cementite (Fe 3 C) can be generated on the surface of the iron oxide-containing material by heating the iron oxide-containing material, the carbonaceous reducing agent, and the oxidizing agent to 400 to 900 ° C. That is, by heating in a state where the iron oxide-containing substance and the carbonaceous reducing agent are in solid contact in the presence of an oxidizing agent, a part of the iron oxide is reduced and cementite is formed.
  • a substance obtained by heating an iron oxide-containing substance, a carbonaceous reducing agent, and an oxidizing agent is referred to as a cementite-containing substance.
  • This cementite-containing material contains, in addition to cementite, Fe, char, ash, etc.
  • a part of the carbonaceous reducing agent reacts with the oxidizing agent (for example, H 2 O, O 2 , Fe 2 O 3, etc.) to generate a combustible gas such as H 2 or CO.
  • the oxidizing agent for example, H 2 O, O 2 , Fe 2 O 3, etc.
  • FIG. 1 shows a configuration in which an iron oxide-containing substance, a carbonaceous reducing agent, and an oxidant are supplied to the heating furnace 4 through separate paths and heated in the heating furnace 4 to produce a cementite-containing material.
  • the present invention is not limited to this configuration.
  • an iron oxide-containing substance and a carbonaceous reducing agent are mixed in advance, and the mixture material added with the oxidizing agent is heated in the heating furnace 4 to be cementite. Inclusions may be produced.
  • an eye anchor bidding method is known as a method for producing cementite.
  • gas such as CH 4
  • a solid carbonaceous reducing agent is used as the reducing agent to directly react with the iron oxide-containing substance, and cementite is generated only on the surface of the iron oxide-containing substance. Therefore, the cementite-containing material can be easily produced.
  • the time for heating the iron oxide-containing substance, the carbonaceous reducing agent, and the oxidizing agent may be set so that cementite is generated in consideration of the heating temperature, for example, about 5 to 60 minutes.
  • carbon dioxide gas for example, exhaust gas from the heating furnace 9 used in the second step described later (or carbon dioxide gas purified and separated from the exhaust gas) can be used.
  • reaction gas containing tar when used as the fuel gas, it adheres to the inside of the piping, the combustion burner nozzle, and the furnace wall. Therefore, the reaction gas is supplied to the scrubber 10 from the path 108 shown in FIG. 1, separated into gas and tar by the scrubber 10, and the recovered gas is supplied to the heating furnace 9 via the path 109. It is recommended to use it as the fuel gas.
  • the recovered gas may be used as the fuel gas after purification (not shown).
  • the tar content separated by the scrubber 10 is conveyed from the path 110 shown in FIG. 1 to the carbonaceous reducing agent supply means 7 and can be used as the carbonaceous reducing agent used in the second step.
  • Second step In the second step, the cementite-containing material obtained in the first step, the iron oxide-containing material and the carbonaceous reducing agent are mixed, and the agglomerate obtained by agglomerating this is charged into the heating furnace 9. Heat and reduce iron oxide in the agglomerate to produce reduced iron.
  • the cementite-containing material previously produced in the first step is mixed with an iron oxide-containing substance and a carbonaceous reducing agent, and when heated, the cementite melts at 1252 ° C.
  • the cementite-containing material generated in advance in the first step is brought into solid-liquid contact by melting and liquefying at a low temperature, thereby increasing the contact area. As a result, it acts as a reducing melting accelerator and promotes melting of the whole agglomerate.
  • the cementite-containing material obtained in the first step may be mixed with the iron oxide-containing material and the carbonaceous reducing agent as it is, but the cementite-containing iron content is separated from the cementite-containing material, and the cementite-containing iron content is It is preferably used as the cementite-containing material in the second step. That is, the cementite-containing material obtained in the first step includes char (fixed carbon and ash mass) in addition to the iron oxide-containing material having cementite formed on the surface. Since this char contains ash, blending the char with the agglomerated raw material causes a large amount of slag to be produced.
  • char fixed carbon and ash mass
  • the cementite-containing iron content is selectively separated from the cementite-containing material obtained in the first step (that is, char is selectively removed), and this cementite-containing iron content is used as a raw material for the agglomerate. Is done.
  • Examples of the method for separating the cementite-containing iron from the cementite-containing material include magnetic separation and specific gravity separation. Specific gravity separation can be performed by putting the above cementite-containing material in, for example, a water tank.
  • the iron oxide-containing material used in the second step may be the same as or different from the iron oxide-containing material used in the first step. Moreover, the same kind as the carbonaceous reducing agent used at the said 1st process may be sufficient as the carbonaceous reducing agent used at a 2nd process, and a different kind may be sufficient as it.
  • a rotary container mixer or a fixed container mixer can be used as the mixer 5 for mixing the raw material mixture.
  • a rotary container type mixer for example, a rotary cylinder type, double cone type, V type mixer or the like can be used.
  • a fixed container mixer for example, a mixer provided with rotating blades (for example, a bowl) in a mixing tank can be used.
  • agglomerating machine 8 for agglomerating the raw material mixture for example, a dish granulator (disk granulator) or a drum granulator (cylindrical granulator) can be used.
  • the shape of the agglomerate is not particularly limited, and may be, for example, a lump shape, a granular shape, a briquette shape, a pellet shape, a rod shape, or the like, preferably a pellet shape or a briquette shape.
  • a known heating furnace may be used, for example, a moving hearth type heating furnace may be used.
  • the moving hearth type heating furnace is a heating furnace in which the hearth moves in the furnace like a belt conveyor, and specifically, a rotary hearth furnace can be exemplified.
  • the rotary hearth furnace is designed in a circular shape (donut shape) so that the start point and end point of the hearth are the same, and the agglomerate supplied on the hearth is Is reduced by heating to make reduced iron.
  • the rotary hearth furnace is provided with charging means for supplying the agglomerate into the furnace on the most upstream side in the rotation direction, and the most downstream side in the rotation direction (since it is a rotating structure, Discharging means is provided immediately upstream of the means).
  • the temperature condition when the iron oxide in the agglomerated material is reduced by heating in the furnace is not particularly limited, but according to the present invention, since the cementite-containing material is blended in the raw material mixture, the furnace temperature is lower than the conventional temperature. Can also be lowered. That is, in order to reduce iron oxide, it has conventionally been necessary to heat the agglomerate to about 1400-1500 ° C. According to the present invention, by adding cementite to the raw material mixture, Therefore, the iron oxide can be melted even if the heating temperature is set to a relatively low temperature of about 1200 to 1400 ° C. The produced reduced iron may be further heated in a furnace and carburized and melted to produce granular reduced iron.
  • a carbon material Prior to supplying the agglomerate to the hearth, it is preferable to lay a carbon material in advance on the hearth as a flooring material.
  • the flooring material acts as a hearth protection material and becomes a carbon supply source when the carbon contained in the agglomerate is insufficient.
  • the obtained reduced iron can be supplied to a steelmaking furnace and used as an iron source.
  • An example of the steelmaking furnace is an electric furnace.
  • slag is produced as a by-product in addition to reduced iron.
  • By-product slag can be reused as roadbed material.
  • the cementite-containing material is produced in the first step, and the obtained cementite-containing material is used as a raw material for the agglomerate in the second step, thereby oxidizing the agglomerate.
  • the melting of iron can be promoted, and as a result, the productivity of reduced iron can be improved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Iron (AREA)

Abstract

L'invention concerne un produit contenant de la cémentite qui est obtenu par chauffage d'une substance contenant de l'oxyde de fer, un agent réducteur carboné et un agent oxydant à 400-900°C. Le fer réduit est ensuite obtenu par chauffage d'un agglomérat contenant la substance contenant de la cémentite, une substance contenant de l'oxyde de fer et un agent réducteur carboné pour réduire l'oxyde de fer dans ledit agglomérat. L'oxyde de fer est ensuite rapidement réduit à l'état fondu et la productibilité de fer réduit est améliorée.
PCT/JP2011/068970 2010-09-07 2011-08-23 Procédé de production de fer réduit Ceased WO2012032927A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011800352344A CN103003452A (zh) 2010-09-07 2011-08-23 还原铁的制造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-200223 2010-09-07
JP2010200223A JP5503472B2 (ja) 2010-09-07 2010-09-07 還元鉄の製造方法

Publications (1)

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WO2012032927A1 true WO2012032927A1 (fr) 2012-03-15

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PCT/JP2011/068970 Ceased WO2012032927A1 (fr) 2010-09-07 2011-08-23 Procédé de production de fer réduit

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CN (1) CN103003452A (fr)
WO (1) WO2012032927A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5957348B2 (ja) * 2012-09-21 2016-07-27 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 部分還元鉄製造装置
KR102176345B1 (ko) * 2018-10-17 2020-11-09 주식회사 포스코 이산화탄소 배출 저감형 용철 제조장치 및 그 제조방법
JP7640157B1 (ja) * 2024-03-19 2025-03-05 学校法人福岡工業大学 セメンタイトの製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10237520A (ja) * 1997-02-28 1998-09-08 Kawasaki Heavy Ind Ltd 鉄カーバイドの製造方法
JPH11509511A (ja) * 1996-02-05 1999-08-24 アイアン カーバイド ホールデイングズ，リミテツド 炭化剤として内部発生酸化炭素を用いる酸化鉄の炭化鉄への転化方法

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Publication number Priority date Publication date Assignee Title
US5137566A (en) * 1990-08-01 1992-08-11 Iron Carbide Holdings, Limited Process for preheating iron-containing reactor feed prior to being treated in a fluidized bed reactor
JP2727436B2 (ja) * 1995-05-31 1998-03-11 川崎重工業株式会社 鉄カーバイドの製造方法及び製造装置
CN1158823A (zh) * 1996-11-15 1997-09-10 宝山钢铁(集团)公司 一种利用冶金尾气生产碳化铁的方法
CA2346977C (fr) * 1998-10-30 2006-09-19 Midrex Technologies, Inc. Procede de production de fer liquide dans des fours duplex
JP4267843B2 (ja) * 2001-08-31 2009-05-27 株式会社神戸製鋼所 金属鉄の製法
JP4438297B2 (ja) * 2003-03-10 2010-03-24 株式会社神戸製鋼所 還元金属の製造方法および炭材内装塊成物

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11509511A (ja) * 1996-02-05 1999-08-24 アイアン カーバイド ホールデイングズ，リミテツド 炭化剤として内部発生酸化炭素を用いる酸化鉄の炭化鉄への転化方法
JPH10237520A (ja) * 1997-02-28 1998-09-08 Kawasaki Heavy Ind Ltd 鉄カーバイドの製造方法

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CN103003452A (zh) 2013-03-27
JP5503472B2 (ja) 2014-05-28
JP2012057202A (ja) 2012-03-22

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