EP1115890A1 - Procede de production de metal directement desoxyde dans un four a etages - Google Patents

Procede de production de metal directement desoxyde dans un four a etages

Info

Publication number
EP1115890A1
EP1115890A1 EP99947270A EP99947270A EP1115890A1 EP 1115890 A1 EP1115890 A1 EP 1115890A1 EP 99947270 A EP99947270 A EP 99947270A EP 99947270 A EP99947270 A EP 99947270A EP 1115890 A1 EP1115890 A1 EP 1115890A1
Authority
EP
European Patent Office
Prior art keywords
deck oven
metal oxides
deck
furnace
oven
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.)
Withdrawn
Application number
EP99947270A
Other languages
German (de)
English (en)
Inventor
Jean-Luc Roth
Thomas Hansmann
Romain Frieden
Marc Solvi
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.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
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 Paul Wurth SA filed Critical Paul Wurth SA
Publication of EP1115890A1 publication Critical patent/EP1115890A1/fr
Withdrawn legal-status Critical Current

Links

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
    • C21B13/10—Making spongy iron or liquid steel, by direct processes in 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
    • C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
    • C21B13/105—Rotary hearth-type furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
    • F27B9/18—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path under the action of scrapers or pushers
    • F27B9/185—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path under the action of scrapers or pushers multiple hearth type furnaces
    • 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 relates to a method for producing directly reduced metal in a deck oven.
  • Multi-deck furnaces are used to manufacture metals from the corresponding
  • Metal oxides are used, a metal oxide and a reducing agent being introduced into the deck oven and reacting with one another at high temperature.
  • the metal oxides and the reducing agent are introduced into the deck furnace and raked by rakes that protrude over the individual floors and conveyed to the edge of the floor, from where they fall through a number of openings provided on a lower level. From there, the metal oxides mixed with reducing agents are transported to the middle of the floor and then fall to the floor below. During the transport from top to bottom through the deck oven, the metal oxides and the reducing agents are gradually heated.
  • the deck oven is heated with gas burners or the like and part of the reducing agent - generally the volatile part of a carbon carrier such as coal - is burned in the deck oven by blowing in an oxygen-containing gas.
  • the process heat required is generated by burning the coal and the gas burners, and carbon dioxide is produced.
  • the carbon dioxide contained in the hot gases reacts with the carbon in the deck oven to form carbon monoxide according to the Boudoir equilibrium.
  • the carbon monoxide thus formed reduces the metal oxides to metal.
  • the carbon monoxide content of the gases in the stage furnace essentially determines the reduction potential.
  • a disadvantage of this method is that oxidized gases and oxygen are introduced into the deck oven where reduction is to take place. Furthermore, a large amount of exhaust gases falls to be treated.
  • This object is achieved according to the invention by a method for producing directly reduced metal! in a deck oven, characterized in that metal oxides and reducing agents are introduced into the deck oven and the process heat required to reduce the metal oxides is generated by indirectly heating individual floors of the egg oven.
  • the process heat is supplied to the deck oven by radiation energy and not by combustion of the reducing agent in situ or by gas burners as in the known methods.
  • a major advantage of the invention is that no oxygen or other oxidized gases have to be blown into the deck oven in order to generate the required process heat. This significantly reduces the amount of gases circulating in the deck oven. Only much smaller amounts of exhaust gas need to be post-treated, which makes the process cheaper.
  • the gas velocities on the individual floors are lower due to the lower gas quantities. Less dust is whirled up and removed from the deck oven. Since no oxygen or other oxidized gases are blown into the deck oven, the reduction potential of the gases within the deck oven is higher than with known deck ovens.
  • the individual floors are indirectly heated independently of one another.
  • this method allows the deck oven and its contents to be heated more evenly.
  • the process can be carried out under a pressure of 1 to 5 bar, which means that the deck oven can be made more compact. Electrical heating resistors are advantageously used for indirect heating of individual floors.
  • gaseous reducing agents are advantageously used! used.
  • the metal oxides are e.g. around iron ore, zinc ores, oil and iron oxide-containing wastes, and various problem wastes, e.g. iron oxide-containing dusts contaminated with zinc oxides and / or other heavy metal oxides.
  • the invention also relates to a deck oven, which comprises several superposed floors, for producing directly reduced metal.
  • the multi-level furnace according to the invention is characterized by means for indirect heating of individual levels which generate the process heat required to reduce the metal oxides
  • the deck oven can, for example, be brought to the required temperature and kept at this temperature by means of electrical heating resistors which are fitted inside the deck oven. It is therefore possible to specifically set the temperature on each floor without significantly influencing the conditions on the next floors. In contrast to the traditional deck oven, the conditions on the different floors can be influenced independently of each other. With the same capacity and gas velocities on the levels, the level furnace for producing directly reduced metal can be smaller than a conventional level furnace using the method according to the invention.
  • the indirect heating elements can be attached to the surface and / or below the individual floors. But they can also be attached to the side wall.
  • This process is particularly advantageous in the direct reduction of iron ore.
  • Fig.2 the schematic arrangement of the electrical heating resistors in the deck oven.
  • Fig. 1 shows a section through a deck oven 10, the several - in this
  • the cover 16 of the deck oven 10 there is a fume hood 20 through which the gases can be evacuated from the deck oven 10 and an opening 22 through which metal oxides and the reducing agent can be applied to the top floor.
  • the metal oxides can also be introduced further below in the deck furnace 10 separately from the reducing agents
  • a shaft 24 is attached, to which rakes 26 are attached, which protrude above the respective floors 12.
  • the shaft 24 and the rake 26 are air or water cooled.
  • the rakes 26 are designed in such a way that they roll the material from the outside inwards on one floor and then from the inside out on the floor below, in order to transport the material through the deck oven 10 from top to bottom.
  • the metal oxides are either mixed with solid reducing agents such as lignite coke, petroleum coke, or coal outside the deck furnace 10, and the mixture of metal oxides and reducing agent is then applied to the top floor.
  • the metal oxides can also be applied separately to the top floor and the solid reducing agents are introduced further down through an inlet opening 30 in the jacket 14 into the deck oven 10.
  • the metal oxides can possibly be pre-dried outside the deck oven 10 before or after they are mixed with the solid reducing agents.
  • the mixture of metal oxides and reducing agents After the mixture of metal oxides and reducing agents has been applied to the first floor of the deck furnace 10, it is circulated by the rakes 26 and conveyed to the edge of the deck, from where it falls through a plurality of openings 28 provided therefor onto the floor below. From there, the metal oxides mixed with reducing agents are transported to the middle of the floor and then fall to the floor below. The metal oxides and the reducing agents are gradually heated during transport.
  • inlet opening 30 In the side walls of the deck furnace 10 - usually in the upper third - at least one inlet opening 30 is provided, through which reducing agents are introduced in the case where they have not already been introduced into the deck furnace 10 together with the metal oxides. Through this inlet opening 30, either all or additional reducing agents can be introduced into the deck oven 10.
  • These reducing agents can be in gaseous form as well as in liquid or solid form.
  • These reducing agents are, for example, carbon monoxide, hydrogen, natural gas, petroleum and petroleum derivatives, or solid carbon carriers such as lignite coke, petroleum coke, blast furnace dust, coal, or the like.
  • the reducing agent, in this case coal, which is introduced to a floor further down in the deck furnace 10, is mixed there by the rakes 26 with the heated metal oxides. Due to the high temperature and the presence of reducing agent, the metal oxides are gradually reduced to metal during transport through the deck oven 10.
  • nozzles 30 are provided for blowing in hot (250 ° C. to 500 ° C.) oxygen-containing gases, through which air or another oxygen-containing gas can be introduced into the deck oven 10. Due to the high temperatures and the presence of oxygen, it is possible to burn the combustible gases in the upper floors 12 of the deck furnace 10 and to use the resulting energy to dry the metal oxides and the reducing agents.
  • a gaseous reducing agent e.g. Carbon monoxide or hydrogen is provided through special nozzles 44.
  • the reduction of the metal oxides can be completed in this atmosphere with an increased reduction potential.
  • the metal produced is then discharged through the outlet 46 in the bottom 18 of the deck furnace 10 together with the ash.
  • the metal discharged at the outlet 46 is cooled in a cooling device 48 with the ash and, if appropriate, still usable reducing agents.
  • the reduced metal is then separated from the ashes of the reducing agents and, if appropriate, further reducing agents 52 by a separating device 50.
  • the gas mixture from the deck furnace 10 passes through the exhaust 20 into an afterburner 54, where the combustible gases of the gas mixture are burned.
  • the gas mixture is then introduced into a cooling device 56 to which a cooling medium is applied and cooled.
  • the cooled gas mixture is then cleaned using a cyclone filter 58 before it is discharged to the outside.
  • pressure locks must of course be provided at the openings 22, 30 for the input of the metal oxides and the reducing agents as well as on the fume cupboard 20.
  • the bearings of the shaft 24 must also be sealed and the outlet 46 must be provided with a lock for discharging hot material.
  • the exhaust gases from the deck furnace 10 can also be used to drive a turbine that generates electrical power.
  • This deck furnace 10 allows iron ore, zinc ores, wastes containing oil and iron oxide, and various problem wastes, such as dusts contaminated with iron oxides and / or other heavy metal oxides, to be used.
  • iron oxide-containing dusts or sludges from electrical or converter steelworks which contain hardly any carbon, or dust from the exhaust gas cleaning of blast furnaces, can be introduced into the deck furnace 10 through a special opening 30.
  • solid, liquid and gaseous reducing agents at various points in the deck furnace 10 and through the possibility of suctioning off excess gases at critical points, it is possible to control the reduction of the residues precisely and to carry out the process under optimal conditions.
  • the small volume of gas with a relatively high content of heavy metals can then be cleaned separately. Due to the small amounts of exhaust gas, low gas velocities occur on the corresponding floors, and so little dust is discharged with this exhaust gas. This results in a very high concentration of heavy metals in the exhaust gas.
  • the combustible gases of the withdrawn gas mixture are burned in an afterburner 66.
  • the remaining part of the gas mixture is cooled in a cooling device 68 and then cleaned with the aid of a cyclone filter 70 before it gets outside.
  • the iron oxide contained in the dusts is reduced to iron with the waste containing oil and iron oxide.
  • All rising gases including the volatile constituents of the reducing agents, can be completely burned outside the deck oven in the drying plant for the residues containing heavy metal and iron oxide and, if applicable, for the reducing agents, and the residual heat of the exhaust gases from the deck oven can be optimally used.
  • FIG. 2 shows a schematic representation of a tier of the deck oven 10 in which heating resistors 72, 74 are attached to the side wall or jacket 14 and below a tier 12.

Landscapes

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

Abstract

L'invention concerne un procédé permettant de produire du métal directement désoxydé dans un four à étages, les oxydes métalliques et un agent de réduction étant introduits dans le four à étages et la chaleur nécessaire à la réduction des oxydes métalliques étant produite par chauffage indirect d'étages individuels du four.
EP99947270A 1998-09-23 1999-08-30 Procede de production de metal directement desoxyde dans un four a etages Withdrawn EP1115890A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
LU90291 1998-09-23
LU90291A LU90291B1 (de) 1998-09-23 1998-09-23 Verfahren zum herstellen von direkt reduziertem Metall in einem Etagenofen
PCT/EP1999/006381 WO2000017404A1 (fr) 1998-09-23 1999-08-30 Procede de production de metal directement desoxyde dans un four a etages

Publications (1)

Publication Number Publication Date
EP1115890A1 true EP1115890A1 (fr) 2001-07-18

Family

ID=19731769

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99947270A Withdrawn EP1115890A1 (fr) 1998-09-23 1999-08-30 Procede de production de metal directement desoxyde dans un four a etages

Country Status (15)

Country Link
EP (1) EP1115890A1 (fr)
JP (1) JP2002526652A (fr)
KR (1) KR20010075318A (fr)
CN (1) CN1319143A (fr)
AU (1) AU6079499A (fr)
BR (1) BR9914460A (fr)
CA (1) CA2343212A1 (fr)
CZ (1) CZ20011042A3 (fr)
LU (1) LU90291B1 (fr)
PL (1) PL346835A1 (fr)
SK (1) SK3942001A3 (fr)
TR (1) TR200101480T2 (fr)
TW (1) TW459049B (fr)
WO (1) WO2000017404A1 (fr)
ZA (1) ZA200102128B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004057038A1 (fr) 2002-12-23 2004-07-08 Posco Appareil de fabrication de fers fondus pour l'amelioration du fonctionnement d'un appareil de reduction de type a lit fluidise et procede de fabrication associe
EP1905853A1 (fr) 2006-09-29 2008-04-02 Paul Wurth S.A. Procédé de traitement thermique de résidus métalliques contaminés par des composés organiques et dispositif pour sa mise en oeuvre
LU91312B1 (en) * 2007-02-16 2008-08-18 Wurth Paul Sa Multiple hearth furnace
JP5601138B2 (ja) * 2010-10-14 2014-10-08 新日鐵住金株式会社 塊成化物の加熱方法
DE102016120833A1 (de) * 2016-11-02 2018-05-03 Thyssenkrupp Ag Etagenofen und Verfahren zum Betreiben eines Etagenofens

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE552837C (de) * 1927-06-21 1932-06-18 Paul Gredt Vorrichtung und Verfahren zum Verhuetten von aus Minette gewonnenen Oolithkoernern
FR717429A (fr) * 1930-12-03 1932-01-08 Trent Process Corp Procédé de réduction directe du minerai de fer
US2089782A (en) * 1934-12-14 1937-08-10 Industrimetoder Ab Process of producing sponge iron
DE1225673B (de) * 1959-07-23 1966-09-29 Kloeckner Humboldt Deutz Ag Verfahren zur trockenen Reduktion von Eisenerz
US3650830A (en) * 1969-06-30 1972-03-21 Nichols Eng & Res Corp Recovery system
DE2134977A1 (de) * 1971-07-13 1973-01-25 Atsukawa Masami Verfahren zum gewinnen von eisen ohne schmelzen des erzes und vorrichtung zur ausuebung des verfahrens
FR2250422A7 (en) * 1973-11-07 1975-05-30 Leur Ryan Indirect heater for basalt dust - has superimposed heater plates with spoked wheels revolving above them
GB2140141B (en) * 1983-05-20 1986-10-01 British Petroleum Co Plc Process and vacuum sublimation furnace for treatment of ores
DE3734892A1 (de) * 1987-10-15 1989-04-27 Egon Evertz Verfahren zur aufbereitung von huettenwerksstaeuben
LU87890A1 (de) * 1991-02-20 1992-11-16 Arbed Verfahren und vorrichtung zum gewinnen von metallen aus industrie-reststoffen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0017404A1 *

Also Published As

Publication number Publication date
TR200101480T2 (tr) 2001-09-21
KR20010075318A (ko) 2001-08-09
CZ20011042A3 (cs) 2001-10-17
SK3942001A3 (en) 2001-12-03
ZA200102128B (en) 2002-06-14
CN1319143A (zh) 2001-10-24
BR9914460A (pt) 2001-05-22
WO2000017404A1 (fr) 2000-03-30
TW459049B (en) 2001-10-11
CA2343212A1 (fr) 2000-03-30
AU6079499A (en) 2000-04-10
LU90291B1 (de) 2000-03-24
PL346835A1 (en) 2002-02-25
JP2002526652A (ja) 2002-08-20

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