EP2089549A2 - Procédé de chauffage micro-ondes et appareil de réduction de l'oxyde de fer - Google Patents

Procédé de chauffage micro-ondes et appareil de réduction de l'oxyde de fer

Info

Publication number
EP2089549A2
EP2089549A2 EP07839202A EP07839202A EP2089549A2 EP 2089549 A2 EP2089549 A2 EP 2089549A2 EP 07839202 A EP07839202 A EP 07839202A EP 07839202 A EP07839202 A EP 07839202A EP 2089549 A2 EP2089549 A2 EP 2089549A2
Authority
EP
European Patent Office
Prior art keywords
feed material
furnace chamber
iron
microwave
chamber
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Withdrawn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
EP07839202A
Other languages
German (de)
English (en)
Other versions
EP2089549A4 (fr
Inventor
Jiann-Yang Hwang
Xiaodi Huang
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2089549A2 publication Critical patent/EP2089549A2/fr
Publication of EP2089549A4 publication Critical patent/EP2089549A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/56—Manufacture of steel by other methods
    • C21C5/567—Manufacture of steel by other methods operating in a continuous way
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary 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
    • 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
    • C21B13/143—Injection of partially reduced ore into a molten bath
    • 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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/34—Arrangements of heating devices
    • 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
    • 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
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • 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
    • C21B2100/42—Sulphur removal
    • 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
    • C21B2100/66—Heat exchange
    • 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
    • Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
    • 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

  • Minimills employ electric arc furnaces (EAF) to melt steel scrap with or without DRI (Direct Reduced Iron) and produce generally lower quality steel.
  • EAF electric arc furnaces
  • DRI Direct Reduced Iron
  • a revolutionary steelmaking technology has been developed by the present inventors based on the use of microwave energy (U.S. Patent No. 6,277,168).
  • This technology can produce DRI, iron or steel from a mixture, consisting of iron oxide fines, powdered carbon and fluxing agents.
  • This technology is projected to eliminate many current intermediate steelmaking steps, such as coking, sintering, BF ironmaking, and BOF steelmaking.
  • This technology has the potential to save up to 50% of the energy consumed by conventional steelmaking; dramatically reduce the emission OfCO 2 , SO 2 , NOx, VOCs, fine particulates, and air toxics; substantially reduce waste and emission control costs; greatly lower capital cost; and considerably reduce steel production costs.
  • Microwave heating technology has the advantage over blast ovens relying on combustion in being faster to heat the iron oxide feed materials since it does not rely on conducting heat into the material through air or other gases but rather it generates heat internally directly by absorbing the microwave radiation. Furthermore, microwave heating is selective, i.e., it only heats components of the material that needs to be heated, i.e., to reduce the hematite or magnetite and does not heat the silica, phosphorus, sulfur or other non ferrous components of the feed material directly, so that the energy is much more efficiently used and the maximum temperature reached can be much lower.
  • the feed material does not need to be electrically conductive to be heated with microwave radiation in being reduced.
  • a further problem resulting from the high temperatures required in conventional reduction processes is that expensive refractory material must be employed in the furnace increasing the capital costs. Also, any silica present may also be reduced, which will also contaminate the iron and have a deleterious effect on its quality in many cases.
  • silica content varies in iron ore from different deposits. While silica will be eliminated by being part of the slag forming on molten metal, if excessive slag forms this will block attempts to inject a gas into the molten metal and thus interfere with the process. Thus, in instances where excessive silica is present in the ore or the pellets, the silica content must first be removed or at least minimized. This has heretofore required grinding of the ore into a very fine powder in order to mechanically separate the silica from the ore, a quite costly process representing a major expense item and energy consumer in processing such ore.
  • feed materials may be reduced in a rotary hearth furnace , a linear conveyor furnace, a rotary kiln, or in vertical shaft furnaces which each enable multiple microwave wave guide mountings to readily achieve the necessary heating capacity for a given application.
  • the DRI produced can be discharged into a collecting container or directly into an electric arc furnace for producing steel.
  • the microwave heating reduction may be combined with a secondary heating of the reduced ore (DRI) to obtain iron nuggets.
  • An induction melting furnace to produce liquid iron can also be used to receive the DRI.
  • the rotary kiln (and all of the other furnaces can utilize a combination of microwave and combustion heating to produce DRI or solely by multiple microwave sources.
  • a linear conveyor associated with a conveyor can produce either DRI or iron nuggets with secondary heating after the reduction phase which may also be accomplished with microwave heating or by burner heating, radio frequency radiation, etc.
  • a vertical shaft furnace can also be used in which the ore pellets or other feed material is introduced at the top of a refractory lined cylinder. Microwave heating is carried out as the material descends down the furnace.
  • An induction heater may be provided at the bottom which receives DRI and produces melted iron discharged therefrom and is slag drawn off from the melted iron.
  • injection of natural gas or other reducing gas can be done to produce DRI in the shaft furnace without carbon material in the feed.
  • microwave energy to reduce the feed materials allows reduction to be carried out at lower a temperature since the entire mass is heated at once such that overheating of any portion is not necessary. If the phosphorus and sulfur remain as oxides in the feed material, they form part of the slag when the reduced feed material is melted and are thereby eliminated from the metal with the slag.
  • Continuous processing is rendered easier by using microwave energy to reduce the feedstock while avoiding any problem with retention of sulfur and or phosphorus.
  • Figure 1 is a diagrammatic sectional view through a rotary hearth furnace and related components according to the present invention.
  • Figure IA is an enlarged view of a section taken through one side of the rotary hearth furnace showing constructional details.
  • Figure 2 is a diagrammatic plan view of the rotary hearth furnace shown in Figure 1.
  • Figure 3 is a view of a vertical section through the rotating base of the rotary hearth furnace of Figures 1 and 2.
  • Figure 4 is a plan view of the rotating base shown in Figure 5.
  • Figure 5 is an enlarged view of a section taken through one side of the rotary furnace shown in Figure 1 showing a DRI discharge and microwave guide.
  • Figure 6 is a vertical section through an electric arc furnace alternatively receiving the DRI for melting.
  • Figure 7 is a diagrammatic view of a vertical section through an induction melting furnace arranged to receive the DRI discharge.
  • Figure 8 is a diagrammatic plan view of an alternate form of rotary hearth furnace according to the invention and showing components for recovery for synthetic gas.
  • Figure 9 is a diagrammatic section view of a rotary kiln version of a microwave heated reduction furnace according to the invention.
  • Figure 10 is a diagram of a conveyor or traveling grate embodiment of a furnace chamber according to the present invention with secondary heating.
  • Figure 11 is a diagram of a vertical shaft furnace chamber according to the present invention.
  • Figure 12 is a diagram of an alternate form of vertical shaft furnace chamber according to the present invention.
  • Figure 13 is a diagrammatic depiction of an overall installation according to the present invention.
  • a rotary hearth furnace 10 according to the present invention is depicted. This comprises a stationary annular upper chamber 12 having outer walls 14 of a refractory insulating material and an inner skin 16 of stainless steel attached to embedded anchors 17 in the refractory walls 14.
  • a rotating base assembly 18 supports a ring shaped hearth 20 which is rotated beneath the stationary annular chamber 12 by a motor- right angle drive 24 and chain 26.
  • a series of main rollers 27 are mounted on a base plate 21 and beneath a support plate 23 rotatable about a pivot 25.
  • a series of inside and outside secondary rollers 29 attached to brackets 29 A transfer the weight of the upper chamber 12 onto bracket flanges 31 on the base assembly 18.
  • a refractory material hearth base 22 holds a hearth layer of such material such as silica, limestone etc. dispensed from a feed opening 28.
  • Feedstock material is dispensed onto the hearth layer through a dispenser 30.
  • Such feed material may include iron ore pellets admixed with ground coal or other carbonaceous material to supply carbon for reduction of the ore, and other components to form "green" balls in the well known manner, creating a bed of feed material on the hearth base 22. Flux, binders and other components are used to create such feed material.
  • Cross pipes 15 can be included to reinforce the chamber 22 particularly during shipping.
  • Refractory divider walls 32, 34 of refractory material define a furnace reduction subchamber 36 within the annular chamber 12 wherein the reduction of the iron oxide feed material takes place.
  • a refractory rope air seal 38 resting on bracket flange 31 encircles the rotating hearth structure 20 to prevent air from entering the chamber 12 and a metal rope microwave seal 40 prevents the escape of microwaves during operation. Similar seals are provided at the material charge and discharge ports for air and microwave sealing.
  • Microwaves from a generator 46 are introduced into the annular chamber 12 through a pair of waveguides 42, 44 which are preferably oriented at 90° to each other to create homogeneous microwave distribution in chamber 12.
  • a microwave "stirrer” blade (not shown) can also be included for even greater homogeneousness of the microwave irradiation.
  • Additional waveguides 48 can be employed if greater power is required for a particular application.
  • a viewing window 49 is also provided.
  • the power level is set to raise the temperatures to that at which reduction will occur i.e., approximately 600 - 1200 0 C, which as discussed above is much lower than the temperatures in excess of 1600 0 C reached in conventional combustion reducing processes.
  • one or more pyrometers 45 and gas probes 47 will be used to monitor the process conditions for control and safety reasons.
  • the speed of microwave heating is much greater than combustion heaters since the microwave radiation heats the material from the inside and only heats the iron bearing material (not the silica). Thus, a continuous process operated at relatively low temperatures is made practical.
  • the feed material is reduced to direct reduced iron (DRJ) by this heating in the present of carbon and then moved to a discharge port and chute 50 ( Figure 5).
  • a steel plow (or screw) 52 causes the DRI to be discharged through the port so where it is collected in a container 54 for further processing.
  • a refractory guide block 56 may be used to adjust the width and depth of feed material on the hearth 22.
  • the DRI may alternatively be directly discharged into an electric arc furnace 58 for the production of steel from the DRI.
  • the DRI may be discharged into an induction melting furnace 60 with discharge ports for liquid metal and slag (not shown).
  • a liquid bath must first be formed using iron prior to initiating the process using DRI.
  • Figure 8 shows an alternative embodiment in which a secondary heating source 64 is provided in order to increase the DRI temperature about 200 0 C in a secondary heating zone 68 within the chamber furnace. This temperature increase along with a proper recipe of the feed material and the hearth layer material can produce iron nuggets as the end product.
  • the secondary heating source could include microwave radiation but microwave absorbing material such as carbon must be added, as the DRI material does not absorb microwave energy. Other heating means could be employed.
  • microwave absorbing material such as carbon must be added, as the DRI material does not absorb microwave energy.
  • Other heating means could be employed.
  • volatile components of coal primarily methane
  • That gas can be used to fuel a burner (not shown) comprising the secondary heat source after removal of dust by a cleaning system such as a bag house 68.
  • the dust can contain byproducts such as zinc or zinc oxide which may be recovered as indicated.
  • FIG. 9 shows a rotary kiln 70 embodiment of the invention in which a cylindrical housing 72 is rotatably mounted and driven with its axis inclined shallowly from the horizontal.
  • the feed material iron ore pellets with coal
  • the feed material is loaded via a charging port 74 into the furnace chamber 76 defined in the housing 72.
  • Microwave radiation from a generator 78 is introduced via a longitudinally aligned waveguide 80.
  • Mating flanges at 77, 79 have interposed microwave and air seals 81, 83.
  • Additional waveguides can be provided on the side via microwave transparent windows 82 (which can be constructed of a refractory material).
  • a burner 84 can augment the heat of the microwaves to produce DRI discharged at discharge port 86.
  • An auger device 77 may also be provided to assist movement of the feed material.
  • FIG 10 shows a linear conveyor furnace 88 in which a furnace chamber defining structure 90 has an endless conveyor 92 (which can be comprised of a traveling grate) with an upper run 94 extending beneath it supported on a support structure 96. Feed material is loaded at one end and carried into a furnace chamber 98.
  • endless conveyor 92 which can be comprised of a traveling grate
  • Furnace chamber 98 has a primary zone 98A irradiated by microwaves radiation from a generator 100 introduced via wave guides 102.
  • a secondary zone 98B further heating of the reduced iron is carried out, as by radio frequency radiation, burners, etc.which can optionally be provided to produce iron nuggets.
  • the DRI or iron nuggets are off loaded at the other end of the conveyor 92.
  • Microwave seals 104 are comprised of an array of steel bars or rods, spaced apart in a pattern which will block microwave leakage through the end openings by well known techniques.
  • Furnace gas can be collected through duct 106.
  • FIG. 11 shows a vertical shaft embodiment of the invention, in which a tubular housing 108 defines a furnace chamber 1 10.
  • the housing 108 can be constructed of a steel grille cover with a refractory shell, allowing penetration of microwaves from generators 1 12 directed through an outer enclosure 114.
  • Feed material such as pellets or a mixture as described is fed into a charging port 116.
  • An induction heater 1 18 at the lower end of furnace chamber 108 receives the DRI produced by the microwave heating in the upper region of the chamber 100 and heats it sufficiently to produce molten iron discharged at port 120. Slag is discharged at the top through port 122.
  • the synthetic gas produced is discharged at the top through port 124.
  • Figure 12 shows a variation in which DRI is discharged via a bottom opening 126.
  • the DRI can be produced without carbon in the feed material by injecting natural or other reducing gas into bottom ports 128.
  • Figure 13 illustrates an integrated apparatus for concurrent production of steel and syngas. Coal is used as both reducing agent and gasification material.
  • Ore from a source A is loaded into a first dispenser 130 positioned over a conveyor 132, coal from a source B into a second dispenser 134, (via a pulverizer 135) additives such as flux from source C into a third dispenser 136 (via a pulverizer 137), and binder from source D in a fourth dispenser 138.
  • the conveyor discharges all of these materials into a mixer which discharges the mixed ingredients into a pulverizer 142 which in turn charges a dispenser 144.
  • Carbon particles are also deposited in a layer onto a conveyor 148 by a second dispenser 146.
  • a rotary conveyor or traveling grate 148 is disposed in a sealed housing 150 (the conveyor perimeter shown in Figure 13 is developed into a straight line).
  • the pellets are dispensed to form a bed 152 on top of a carbon particle bed 155 on the conveyor 148 via a charging port 154.
  • the carbon particles are deposited onto the conveyor 148 via a charging port 156.
  • An organic binder is used to agglomerate iron ore concentrate, pulverized coal and fluxing agent into pellets.
  • the feed material is dispensed onto the conveyor 148 in a layer leveled by the lower end of the dispenser 154 and is transported from the entrance to the exit of the furnace chamber 168.
  • Microwave radiation from generators 160 is introduced into the furnace through waveguides 158 to heat the feed material to reduce the iron oxide.
  • Iron oxides and many carbon bearing materials are excellent microwave absorbers and can be readily heated by microwave irradiation. Upon microwave heating, volatiles, primarily methane in the coal, are released into the off-gasses to form a portion of the syngas.
  • iron ore is reduced into metallic iron or DRI in the reduction zone 168.
  • metallic iron or DRI metallic iron or DRI in the reduction zone 168.
  • most of the water and carbon dioxide are reacted with carbon to form hydrogen and carbon monoxide.
  • the process is a continuous operation.
  • the produced DRI also function as a catalyst to promote the transformation of methane into hydrogen and carbon monoxide.
  • the off-gases eventually reach a steady composition, a mixture of volatiles and iron ore reduction spent gas. Due to no oxygen or air required for combustion as in a ordinary gasifier or a combustion furnace, the off-gas composition can be readily controlled and a high quality syngas can be produced and collected.
  • the coal volatile content and the equilibrium phase diagram or iron oxides, iron, CO, and CO 2 vs. temperature can be used as references for controlling the off-gas composition.
  • the exhaust port 166 can be located either near the feed material charging port or the product discharging port to form a countercurrent or concurrent flow. The countercurrent flow transfers gas heat better to the feed material and the concurrent flow generates a higher quality syngas.
  • the feed material becomes a poor microwave absorber due to formation of networked metallic iron. Therefore, the underling carbon layer or coating, preferably made of pyrolyzed carbon particles such as coke, graphite, activated carbon, or fly ash carbon in dry or slurry form, is layered or applied before charging iron ore agglomerates into the furnace by the dispenser 156.
  • the carbon layer 155 or coating becomes the major microwave receptor/susceptor to be heated by microwave and to transfer heat to the above disposed DRI in the smelting zone.
  • the smelting zone 170 is separated from the reduction zone by refractory dividers 152 to reduce interference between the two zones.
  • carbon microwave receptor material can be applied over the agglomerates/DRI at an appropriate location.
  • the carbon material is heated by microwave and transfers heat to the underneath agglomerates/DRI.
  • a powdered poor microwave absorbing material also can be used to cover the agglomerates/DRJ to reduce convection and radiation heat loss.
  • the DRI 's temperature continues to rise and the DRI reacts with the remaining internal carbon and the underlying or covering carbon to form molten iron nuggets and associated slag.
  • the eutectic iron and carbon composition (4.26%C) helps to lower the melting point of the iron to 1 154°C.
  • the associated slag has a composition suitable for desulphurization and dephosphorization with lower melting point, lower viscosity, proper plasticity, and easy separation of iron nuggets from slag after cooling.
  • the remaining underlying carbon layer also functions as an isolator between the molten nuggets/slag and the refractory base to prevent erosion of the molten nuggets/slag to the refractory and facilitates discharging the produced nuggets/slag from the refractory base.
  • another refractory coating made of oxides, borides, carbides and/or nitrides can be applied between the carboh layer and the refractory base.
  • the produced iron nuggets can be used as a feed material for steelmaking by EAF or a feed material for ferrous foundries.
  • the off-gas is of lower temperature and contains less particulate.
  • the off-gas is passed through a cleaning system 164 to further cool down, remove and collect particulates in a container 172, recover and collect sulfur in a container 172, and separate H 2 O and CO 2 if any and necessary, becoming a syngas.
  • the syngas production has fewer problems OfH 2 O separation and NO x formation.
  • the syngas can be used as a fuel for ordinary heating, a raw material for production of chemicals and liquid fuels, a hydrogen source after separation, a fuel to drive a power plant, or a reducing gas for iron ore reduction.
  • Various heat exchangers can be installed along the line to utilize waste heat.

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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)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Iron (AREA)

Abstract

L'invention concerne un appareil et un procédé de réduction des oxydes de fer par chauffage micro-ondes dans la chambre d'un four étanche à l'air entrant, ce qui permet de réduire l'énergie nécessaire, d'obtenir une réduction à basse température et de récupérer le gaz synthétique du combustible en qualité de produit dérivé du processus. La réduction du soufre, du phosphore et de la silice est ainsi évitée, ainsi que tout besoin de réduire le contenu en silice du matériau de départ avant de réduire le minerai. Des configurations de four à foyer rotatif continu, de séchoir rotatif, de transporteur linéaire et de chambre de four à colonne verticale sont également décrites. Une zone de chauffage secondaire peut également être incluse afin de traiter le fer réduit et d'obtenir des pépites de fer ou du fer métallique liquide.
EP07839202A 2006-10-03 2007-10-03 Procédé de chauffage micro-ondes et appareil de réduction de l'oxyde de fer Withdrawn EP2089549A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US84909806P 2006-10-03 2006-10-03
US86567206P 2006-11-14 2006-11-14
PCT/US2007/021254 WO2008051356A2 (fr) 2006-10-03 2007-10-03 Procédé de chauffage micro-ondes et appareil de réduction de l'oxyde de fer

Publications (2)

Publication Number Publication Date
EP2089549A2 true EP2089549A2 (fr) 2009-08-19
EP2089549A4 EP2089549A4 (fr) 2011-03-02

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Country Status (5)

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EP (1) EP2089549A4 (fr)
CN (1) CN101548024B (fr)
AU (1) AU2007309609B2 (fr)
BR (1) BRPI0717798A2 (fr)
WO (1) WO2008051356A2 (fr)

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CN104023851B (zh) 2011-08-01 2016-08-31 高级矿业资源有限公司 矿石加工
US8545594B2 (en) 2011-08-01 2013-10-01 Superior Mineral Resources LLC Ore beneficiation
JP5729277B2 (ja) * 2011-11-30 2015-06-03 新日鐵住金株式会社 固体還元炉
JP5729278B2 (ja) * 2011-11-30 2015-06-03 新日鐵住金株式会社 固体還元炉
CN102425934B (zh) * 2011-12-20 2013-06-26 湖南省中晟热能科技有限公司 一种微波加热高温竖式窑
EP2628805A1 (fr) 2012-02-14 2013-08-21 Siemens VAI Metals Technologies GmbH Procédé et dispositif de réduction de matières de départ contenant de l'oxyde de fer dans un agrégat de réduction haute pression
CN102837932B (zh) * 2012-08-03 2015-04-15 莱芜钢铁集团有限公司 一种连续平推式出料装置及其出料方法
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BRPI0717798A2 (pt) 2014-06-17
CN101548024B (zh) 2013-11-20
AU2007309609B2 (en) 2012-03-15
WO2008051356A2 (fr) 2008-05-02
WO2008051356A3 (fr) 2009-03-05
EP2089549A4 (fr) 2011-03-02
CN101548024A (zh) 2009-09-30

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