EP0179734B1 - Verfahren und Vorrichtung zur Herstellung eines Eisenschwamms bzw. Roheisens - Google Patents

Verfahren und Vorrichtung zur Herstellung eines Eisenschwamms bzw. Roheisens Download PDF

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Publication number
EP0179734B1
EP0179734B1 EP85730134A EP85730134A EP0179734B1 EP 0179734 B1 EP0179734 B1 EP 0179734B1 EP 85730134 A EP85730134 A EP 85730134A EP 85730134 A EP85730134 A EP 85730134A EP 0179734 B1 EP0179734 B1 EP 0179734B1
Authority
EP
European Patent Office
Prior art keywords
reduction
plane
reduction gas
bustle
shaft furnace
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.)
Expired
Application number
EP85730134A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0179734A3 (en
EP0179734A2 (de
Inventor
Rolf Dr. Hauk
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.)
Deutsche Voest Alpine Industrieanlagenbau GmbH
Original Assignee
Deutsche Voest Alpine Industrieanlagenbau GmbH
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 Deutsche Voest Alpine Industrieanlagenbau GmbH filed Critical Deutsche Voest Alpine Industrieanlagenbau GmbH
Priority to AT85730134T priority Critical patent/ATE48651T1/de
Publication of EP0179734A2 publication Critical patent/EP0179734A2/de
Publication of EP0179734A3 publication Critical patent/EP0179734A3/de
Application granted granted Critical
Publication of EP0179734B1 publication Critical patent/EP0179734B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B11/00—Making pig-iron other than in blast furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
    • C21B13/002—Reduction of iron ores by passing through a heated column of carbon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • C21B13/029—Introducing coolant gas in the shaft furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature

Definitions

  • the invention relates to a method for producing sponge iron and / or liquid pig iron from iron ore, in which the lumpy iron ore is reduced to sponge iron in a reduction shaft furnace by means of a reducing gas, and the reduction gas is introduced into the shaft furnace at the level of the bustle and below the level of the bustle is, and an apparatus for performing this method.
  • Such a method or such a device is known from US-A4224057.
  • the production of sponge iron by reducing and carburizing iron ore located in a shaft furnace by means of reducing gas takes place there in such a way that fresh reducing gas produced from water vapor and natural gas or coke-oven gas is introduced both into the middle region and into the lower region of the vertical shaft furnace.
  • the reducing gas introduced into the shaft furnace consists in each case of a proportion of fresh reducing gas supplied through lines and of a proportion of shaft furnace exhaust gas recirculated.
  • the gas supplied in the middle is heated to a temperature in the range of 850 to 950 ° C and reduces the ore in the upper, narrower area of the shaft furnace, i.e. in the reduction zone.
  • the gas supplied below is not heated and cools and carburizes the reduced ore that is in the lower part of the shaft furnace, i.e. i.e. located in the cooling and carburizing zone.
  • the shaft furnace tapers approximately uniformly downwards and upwards, its lower area having a height that is greater than its diameter.
  • hot reducing gas is generated in a melter gasifier below the reduction shaft furnace, which is introduced into the shaft furnace after cooling via a central gas inlet and via the outlet openings of the shaft furnace connected to the meltdown gasifier.
  • the introduction via the outlet openings is an inevitable consequence of the direct connection of the lower part of the reduction shaft furnace to the melter gasifier via downpipes for transferring the sponge iron into the melter gasifier without the use of locks or shut-off devices.
  • Efforts are therefore made to make the proportion of the amount of the reducing gas supplied via the outlet openings in relation to the proportion of the amount of the reducing gas supplied via the central inlet as small as possible by appropriate setting of the respective flow resistances.
  • Both gas streams are cooled to the extent that they have a temperature in the range from 760 ° C to 850 ° C when they enter the reduction shaft furnace.
  • no special measures are taken to increase the carbon content of the sponge iron or pig iron produced.
  • the carbon accumulation on the inner surface of the sponge iron proceeds via the reactions from.
  • the accumulation of carbon-containing dust on the outer surface of the sponge iron has no advantages, since this dust is rubbed off again in the downstream melter, for example.
  • the formation of cementite is favored at higher temperatures, but this takes place only to a limited extent.
  • the CO decay via the Boudouard reaction is favored at low temperatures.
  • the reduction of iron ore is carried out at temperatures of approx. 850 ° C. At these temperatures, only a little carbon can separate from the reducing gas, especially when its eO z content is above 3%.
  • the process according to the invention therefore takes place in a two-stage process in which the iron ore is first reduced at a temperature of approximately 850 ° C. and then the sponge iron produced at a lower temperature, that is to say preferably in the range from 650 ° C. to 750 ° C. ° C is carburized.
  • the device shown schematically in Fig. 1 is used for the direct production of molten pig iron from lumpy iron ore with a reduction shaft furnace 1 and a melter gasifier 2.
  • the iron ore is introduced via an inlet 3 in the upper part of the shaft furnace 1, while the blast furnace gas generated in the shaft furnace through an outlet 4 is led out in the upper part of the furnace.
  • the iron ore supplied is reduced essentially above the bustle level 5, at the level of which reducing gas having a known composition and a temperature of preferably 850 ° C. is introduced via inlets 6 arranged in a ring on the circumference of the reduction shaft furnace 1.
  • the reduction shaft furnace 1 and the melter gasifier 2 arranged underneath are connected to one another by downpipes 7. These downpipes 7 lead on the one hand into openings in the bottom of the reduction shaft furnace 1 and on the other hand into openings in the upper part of the melter gasifier 2. They are used to transfer the sponge iron produced by reducing the iron ore from the shaft furnace 1 into the meltdown gasifier 2 and to convey the reduction gas generated in the meltdown gasifier 2 in the lower area of the shaft furnace 1.
  • the reducing gas having a temperature of approximately 1,000 ° C. in the melter gasifier 2 is cooled to such an extent that it only has a temperature of approximately 700 ° C. upon entry into the reduction shaft furnace 1.
  • the cooling is carried out by admixing the appropriate amount of cooling gas, which is introduced from a manifold 8 via a line 9 into the downpipes 7.
  • reducing gas is further led out via a line 10, to which cooling gas is mixed via a line 11, in such a way that the gas has a temperature of about 850 ° C.
  • This is freed of dust particles in a cyclone 12 and then introduced into the reduction shaft furnace 1 in the bustle level 5.
  • the dust accumulating in the cyclone 12 is returned to the melter 2 via a line 13.
  • the pressure loss in the cyclone 12 and the ratio of the cross-sectional area of the shaft furnace 1 below the bustle level 5 to the distance between the bustle level and the inlet openings of the downpipes 7 in the shaft furnace can be increased will. It should be noted that it is not possible to regulate the partial flow quantities by means of regulating flaps in the hot dust-containing gases.
  • the ratio of the amount of the reducing gas fed through the downpipes 7 to the amount of the reducing gas fed in the bustle plane 5 is between 0.1 and 0.5, preferably 0.3.
  • the volume resistance for the reducing gas to be supplied in the bustle level 5 is dimensioned such that it corresponds to a pressure drop between 10 and 100 mbar.
  • the residence time of the reduced iron in the area between the bustle level 5 and the inlet openings of the downpipes 7 in the bottom of the reduction shaft furnace is between 1 and 4 hours, preferably about 3 hours.
  • the long dwell time of the sponge iron in the reducing gas stream rising from the downpipes 7 is achieved by the largest possible volume of the reduction shaft furnace 1 between the bustle level 5 and the level in which the downpipes 7 open into the shaft furnace. It should be noted here that if the distance between the two levels is increased, the volume of the shaft furnace in this area is increased accordingly, but the flow resistance for the ascending reducing gas is increased and the gas quantity is accordingly reduced.
  • This problem can be solved in such a way that the shaft cross-section below the bustle level 5 is increased, whereby the volume of this area of the shaft furnace 1 is increased while the flow resistance remains the same. It is therefore desirable to aim for the largest possible volume of this shaft furnace section with the smallest possible distance between the bustle level and the lower inlets for the reducing gas.
  • the ratio of the distance between the bustle level 5 and the inlet openings of the downpipes 7 in the bottom of the reduction shaft furnace to the diameter of the shaft furnace in this region (H / F) is preferably between 0.5 and 1.0.
  • the flow resistances can be further controlled by appropriate dimensioning of the line cross-sections and by an additional pressure loss of the bustle.
  • the device according to FIG. 2 has a coal gasifier 14 instead of a melter gasifier.
  • This generates the for coal in a known manner from coal and oxygen Reduction shaft furnace 1 required reducing gas. Since this has a temperature of approximately 1,500 ° C. when it emerges from the coal gasifier 14, it is first cooled to 1,000 ° C. in a waste heat system 15. The reducing gas stream is then divided into two partial streams, one partial stream via line 10 after cooling to 850 ° C.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
EP85730134A 1984-10-12 1985-09-30 Verfahren und Vorrichtung zur Herstellung eines Eisenschwamms bzw. Roheisens Expired EP0179734B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85730134T ATE48651T1 (de) 1984-10-12 1985-09-30 Verfahren und vorrichtung zur herstellung eines eisenschwamms bzw. roheisens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3437913 1984-10-12
DE3437913A DE3437913C2 (de) 1984-10-12 1984-10-12 Verfahren und Vorrichtung zur Herstellung von Eisenschwamm und/oder flüssigem Roheisen

Publications (3)

Publication Number Publication Date
EP0179734A2 EP0179734A2 (de) 1986-04-30
EP0179734A3 EP0179734A3 (en) 1986-12-30
EP0179734B1 true EP0179734B1 (de) 1989-12-13

Family

ID=6248014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85730134A Expired EP0179734B1 (de) 1984-10-12 1985-09-30 Verfahren und Vorrichtung zur Herstellung eines Eisenschwamms bzw. Roheisens

Country Status (13)

Country Link
US (2) US4854967A (xx)
EP (1) EP0179734B1 (xx)
JP (1) JPS6191308A (xx)
KR (1) KR900004155B1 (xx)
CN (1) CN1004282B (xx)
AT (1) ATE48651T1 (xx)
AU (1) AU562850B2 (xx)
BR (1) BR8505068A (xx)
CA (1) CA1278430C (xx)
DD (1) DD246319A5 (xx)
DE (1) DE3437913C2 (xx)
SU (1) SU1503686A3 (xx)
ZA (1) ZA857594B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2528941C2 (ru) * 2012-09-24 2014-09-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Курганский государственный университет" Способ получения металлического титана и устройство для его осуществления

Families Citing this family (29)

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DE3438487A1 (de) * 1984-10-17 1986-04-24 Korf Engineering GmbH, 4000 Düsseldorf Verfahren zur herstellung von roheisen
ZA85287B (en) * 1985-01-21 1986-09-24 Korf Engineering Gmbh Process for the production of pig iron
DE3503493A1 (de) * 1985-01-31 1986-08-14 Korf Engineering GmbH, 4000 Düsseldorf Verfahren zur herstellung von roheisen
JPH0689386B2 (ja) * 1986-03-04 1994-11-09 株式会社神戸製鋼所 溶融還元炉発生ガスの改質・除塵方法
EP0257173B1 (de) * 1986-08-12 1990-03-14 VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. Hüttenwerk sowie Verfahren zum Betrieb eines solchen Hüttenwerkes
EP0257172B1 (de) * 1986-08-12 1991-02-06 VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. Hüttenwerk sowie Verfahren zum Betrieb eines solchen Hüttenwerkes
DE3629589A1 (de) * 1986-08-30 1988-03-03 Krupp Gmbh Verfahren zur herstellung von eisen aus feinkoernigen eisenerzen
DE3841835C1 (en) * 1988-07-08 1989-11-02 Klimanek Gmbh, 6680 Wiebelskirchen, De Process for the manufacture of re-usable products from metallic sludges containing large amounts of adhering oil or other impurities
US5114122A (en) * 1989-03-08 1992-05-19 Hnat James G Apparatus for heat processing glass batch materials
US5320676A (en) * 1992-10-06 1994-06-14 Bechtel Group, Inc. Low slag iron making process with injecting coolant
US5397376A (en) * 1992-10-06 1995-03-14 Bechtel Group, Inc. Method of providing fuel for an iron making process
US5354356A (en) * 1992-10-06 1994-10-11 Bechtel Group Inc. Method of providing fuel for an iron making process
US6197088B1 (en) 1992-10-06 2001-03-06 Bechtel Group, Inc. Producing liquid iron having a low sulfur content
AT402506B (de) * 1993-01-26 1997-06-25 Holderbank Financ Glarus Verfahren zur herstellung von roheisen und zementklinker
GB2281311B (en) * 1993-03-29 1996-09-04 Boc Group Plc Metallurgical processes and apparatus
US5958107A (en) * 1993-12-15 1999-09-28 Bechtel Croup, Inc. Shift conversion for the preparation of reducing gas
AT403926B (de) 1996-07-10 1998-06-25 Voest Alpine Ind Anlagen Verfahren zum erzeugen eines für eine reduktion von metallerz dienenden reduktionsgases und anlage zur durchführung des verfahrens
AUPO122796A0 (en) * 1996-07-25 1996-08-15 McLaughlin, Darren Neville Mac's mini spit
AT403929B (de) * 1996-07-10 1998-06-25 Voest Alpine Ind Anlagen Verfahren zum erzeugen eines für eine reduktion von metallerz dienenden reduktionsgases und anlage zur durchführung des verfahrens
AT406382B (de) * 1996-11-06 2000-04-25 Voest Alpine Ind Anlagen Verfahren zum herstellen von eisenschwamm durch direktreduktion von eisenoxidhältigem material
AT404256B (de) * 1996-11-06 1998-10-27 Voest Alpine Ind Anlagen Verfahren zum herstellen von eisenschwamm
US20050151307A1 (en) * 2003-09-30 2005-07-14 Ricardo Viramontes-Brown Method and apparatus for producing molten iron
CN101269315B (zh) * 2008-05-12 2011-08-31 河北理工大学 一种用于污水处理的改性球形海绵铁及制备方法
WO2011147006A1 (pt) * 2010-05-24 2011-12-01 Henrique Carlos Pfeifer Disposições introduzidas em unidade de produção de aço líquido
US10508314B2 (en) 2015-06-24 2019-12-17 Midrex Technologies, Inc. Methods and systems for increasing the carbon content of sponge iron in a reduction furnace
US10316376B2 (en) 2015-06-24 2019-06-11 Midrex Technologies, Inc. Methods and systems for increasing the carbon content of sponge iron in a reduction furnace
CN106854702B (zh) * 2015-12-09 2019-03-15 中国科学院过程工程研究所 一步转化分离钒钛铁精矿中铁、钒和钛的方法
CN107619941A (zh) * 2017-10-30 2018-01-23 攀钢集团攀枝花钢铁研究院有限公司 从钒铬渣中分离钒与铬的方法
US12084730B2 (en) 2020-03-24 2024-09-10 Midrex Technologies, Inc. Methods and systems for increasing the carbon content of direct reduced iron in a reduction furnace

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US4054444A (en) * 1975-09-22 1977-10-18 Midrex Corporation Method for controlling the carbon content of directly reduced iron
JPS5435813A (en) * 1977-08-25 1979-03-16 Kobe Steel Ltd Controlling method for carbon content of reduced pellets
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2528941C2 (ru) * 2012-09-24 2014-09-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Курганский государственный университет" Способ получения металлического титана и устройство для его осуществления

Also Published As

Publication number Publication date
KR900004155B1 (ko) 1990-06-18
KR860003350A (ko) 1986-05-23
US4958808A (en) 1990-09-25
DD246319A5 (de) 1987-06-03
EP0179734A3 (en) 1986-12-30
ATE48651T1 (de) 1989-12-15
BR8505068A (pt) 1986-07-29
US4854967A (en) 1989-08-08
SU1503686A3 (ru) 1989-08-23
JPS6191308A (ja) 1986-05-09
ZA857594B (en) 1986-10-29
AU4821485A (en) 1986-04-17
AU562850B2 (en) 1987-06-18
CA1278430C (en) 1991-01-02
DE3437913C2 (de) 1987-05-07
CN85108059A (zh) 1986-05-10
EP0179734A2 (de) 1986-04-30
DE3437913A1 (de) 1986-04-24
CN1004282B (zh) 1989-05-24

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