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WO2003002775A2 - Procede permettant de traiter les poussieres de gueulard de fours electriques de fonte de fer d'acieries - Google Patents

Procede permettant de traiter les poussieres de gueulard de fours electriques de fonte de fer d'acieries Download PDF

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Publication number
WO2003002775A2
WO2003002775A2 PCT/EP2002/007052 EP0207052W WO03002775A2 WO 2003002775 A2 WO2003002775 A2 WO 2003002775A2 EP 0207052 W EP0207052 W EP 0207052W WO 03002775 A2 WO03002775 A2 WO 03002775A2
Authority
WO
WIPO (PCT)
Prior art keywords
sintering
product
station
furnace
mass
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/EP2002/007052
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English (en)
Other versions
WO2003002775A3 (fr
Inventor
Dario Bodino
Guglielmo Bodino
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.)
TECOAER SpA
Original Assignee
TECOAER SpA
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 TECOAER SpA filed Critical TECOAER SpA
Priority to AU2002317847A priority Critical patent/AU2002317847A1/en
Publication of WO2003002775A2 publication Critical patent/WO2003002775A2/fr
Publication of WO2003002775A3 publication Critical patent/WO2003002775A3/fr
Anticipated expiration legal-status Critical
Ceased 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
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • C21B13/023—Making spongy iron or liquid steel, by direct processes in shaft furnaces wherein iron or steel is obtained in a molten state
    • 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
    • C21B13/006—Starting from ores containing non ferrous metallic oxides
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/02—Working-up flue dust
    • 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
    • Y02P10/20—Recycling

Definitions

  • the present invention is about a method for treating iron electric furnaces' flue gas dust of steel mills, and more specifically relates to a plant that allows the treatment of such dusts producing pig iron and therefore employable in the electric steel mills themselves.
  • a first attempt to solve this problem has been the designing of a method that tries to recover such metals through procedures and plants, which provide a pelletizing, and a sintering phase of said dusts. It is known however that the filters' dusts alone are pelletizable but not sinterable, because having little iron oxide they do not possess the adequate features for being reduced. For this reason, techniques that allow to sinter these dusts have been studied and developed, and among these the most used technique is the one that mixes such dusts in the range of 50% with other iron oxides present in the steel mill such as rolling and casting scales, or even oxides coming from the slag recovery. The load thus obtained, after being pelletized continues to the sintering phase on a continuously moving grate in an open ambient.
  • Said grates known to the state of the art and usually employed in these plants are 100-150 m long and consist of long movable sintering devices having on their lower part grates and flue gas suction means, gases that get generated by the process, placed downstream of the device.
  • the material gets loaded at one of the grate's ends and starts to move towards a final unloading mechanism fit to collect the iron oxides, during the whole course the material being subject to temperatures in the range of 1000-1300°C. It is obvious that during the sintering a constant mixing of the material occurs which causes the separation of the material in its composing elements not to be controlled because part of the sintered product gets mixed, moving, with the part of the material yet to be sintered.
  • Said device being in an open ambient becomes impossible to control the temperatures, which the material is subject to, the part of the material in contact with the burners that triggers the sintering process being the only controllable. Even if part of the non-ferrous metals gets separated converting them into oxides and recovering them in the collection devices downstream of the sintering grate, they do not get entirely separated and there is not a total control over the flue gases produced, which get suctioned even if their polluting substance is only partially known.
  • Object of the present invention is thus that of providing a method and a plant that allows the use of these dusts containing non-ferrous metal oxides as raw material, and that allows at the same time a good separation of said non-ferrous metals from the iron oxides and other polluting substances, where its abatement would allow the obtainment of less polluting flue gas.
  • the method according to the invention has the following phases: a) storing the dust obtained from the filtering of the electric steel mills' flue gas together with dusts of a product rich in iron oxides and a carbonaceous compound; b) mixing the stored product; c) pelletizing the mass thus obtained; d) sintering the pelletized product; and e) unloading the pelletized product into a pig iron producing furnace, wherein the sintering phase is carried out in three separate and independent sub- phases of loading the pelletized product, carrying out its triggering and reducing the oxides in controlled air and temperature conditions, being the mass in static conditions during the whole phase.
  • the method according to the invention is carried out through the inventive plant comprising at least three storing silos, said three silos being connected to at least one mixer able to unload the compound obtained in the pelletizing device, said pelletizing device being equipped with means fit to unload the pelletized product into a sintering unit.
  • Said sintering unit is equipped with means to directly unload the sintered product into a furnace and comprises a set of three stations, one independent from the other, able to carry out the separate sub-phases of loading of the mass, its triggering and sintering, and wherein at least two of said stations subsequent to the first one keep the mass still in controlled air and temperature conditions.
  • Figure 1 is a diagrammatic layout of a preferred embodiment of the plant according to the invention comprising the sintering device according to the invention.
  • the plant 1 according to the invention comprises at least three silos 2, 3, 4, wherein the dusts coming from the filtering of the electric steel mills' flue gas get respectively stored, dusts of a compound rich in iron oxides, preferably such as rolling and casting scales, and a compound rich in carbon, preferably coke.
  • a mixer 5 is placed downstream of said silos and can be a screw mixer that is able to mix the three abovementioned components and through known conveyor means transfer the obtained compound to a pelletizing device 6.
  • a pelletizing device 6 From said pelletizing device 6 through known conveyor means 7 the pellets get inserted into a sintering unit 16 that is made of a set of containers 18 fixed to a closed loop carrier belt 17; each container 18 therefore sequentially passes from one loading station 9, where it is filled up with the pelletized mass unloaded from the conveyor which has collected it from the pelletizing device, to a triggering station 10 where the mass is triggered by proper heating means, and then to one or more sintering stations 11 , 11', 11", at the end of which the container revolves around the belt's return roller 19 and thus pours its sintered contents directly or indirectly into the furnace, after which the empty containers 18 run the lower return belt stretch until they reach the initial loading station again.
  • a cooler 12 Downstream of the last sintering station 11 there is a cooler 12 wherein the flue gases produced by the sintering device's unloading and the gases produced by the furnace 8 are conveyed, said cooler being operatively connected to a filters set 13 wherein said cooled flue gases are conveyed.
  • the triggering station 10 and the at least one sintering station 11 are equipped with a grate (not shown) that allows the passage of the flue gases into the lower part, and said gases produced by the station 10 are filtered into the device 15 and reinserted into the lower part of the at least one sintering station 11.
  • the flue gases produced in the sintering phase contain the various vapor state metals, said vapors of each metal forming according to the different volatilization temperatures of the metals, and are conveyed into the collecting device 14 placed downstream where the metals' vapors get transformed into oxides again.
  • the gases produced by the station 10 are reduction gases that when they reach the device 15 allow the separation of chlorine in the form of chlorides, more particularly sodium and potassium, cadmium and lead chloride in the form of oxides. Said reduction gases, once they are freed from such elements, they subsequently get reinserted into the lower part of the sintering area and help the process of partial reduction of the iron oxides.
  • a furnace 8 Downstream of said sintering device there is a furnace 8 known to the state of the art for the production of pig iron.
  • the upper part of the furnace 8 is also connected to the cooler 12 and to the filters set 13 for the dust collection and the treatment of the flue gases coming from the furnace 8.
  • the air utilized by the cooler is preferably sent back into the furnace 8 for the combustion, from its bottom pig iron is produced and the slag is unloaded.
  • the plant 1 previously described is suitable for the operation of the method according to the invention.
  • the first phases of said method consist in the storing and mixing of the three substances: filtering dusts of the steel mills' flue gases, dusts rich in iron oxides and carbonaceous compounds.
  • the mixing of dusts containing non- ferrous oxides with said other substances turns out to be necessary in order to enrich the dusts coming from the steel mills' flue gases in iron oxides because it would jeopardize the reduction of said mixed oxides of the non-ferrous metals at the sintering device level.
  • 50% of said dusts get mixed, being the remaining carbonaceous compound and products rich in iron oxides.
  • the third phase of pelletizing is able to produce pellets of the size of about 8- 12 mm that are conveyed and loaded through known means to the sintering device.
  • the different phases of the method occur at room temperature and open ambient.
  • the product is thus inserted into the sintering unit, consisting in at least three stations: in the first station 9 the sub-phase concerning the loading of the pelletized material into appropriate containers connected to a closed loop carrier belt occurs, in the second independent station 10 the sub-phase concerning the triggering of the material with the production of carbon monoxide that will allow the reduction of the various non-ferrous metal oxides occurs.
  • Said station 10 is kept closed in order to maintain the quantity of air constant, therefore allowing the combustion control.
  • the sub-phase concerning the closed environment sintering occurs.
  • the material's mass turns out to be still and during a first phase the hot gases get suctioned towards the bottom preheating the whole compound and carrying out a partial reduction.
  • the gas flow is reversed and a reduction of the non- ferrous metal oxides happens, which transformed into metals at specific temperatures, distinctive of each metal, vaporize, while a partial reduction of the iron oxide occurs.
  • the non-ferrous metal oxides present in the pellets are thus reduced to metals in the gas state and separated, conveyed into the collecting device 14 where they are transformed again into pure oxides through the available oxygen.
  • This source of oxides is usable as source of the different metals. More particularly, in the collecting device 14 the zinc gets separated in the form of zinc oxide. In the sintering station 11 micro-dioxins are also burned, which in this manner get abated without being part of the flue gases that are suctioned and conveyed into the filtering devices 15 and 13. The load and furnace flue gases come out at temperatures of about 200°C and are conveyed into the cooler 12 and subsequently are freed from dust in the filters set 13.
  • the sintered product turns out to be constituted of iron and reduced iron oxides, and, preferably still hot, is inserted into the furnace for the production of pig iron.
  • the containers by now empty are thus returned to the material loading station 9.
  • the time spent by the sintering assembly from the triggering sub-phase into the station 10 up to the end of the sintering in the stations 11 , 11', 11", etc. varies from 30 to 45 minutes.
  • the sintering phase in a shorter time that, through continuous moving grates of the material were in the hour range, but it is also possible to control the temperature and the oxygen's presence due to the material stillness.
  • the single sintering stations 11 , 11', 11" is as if the process would occur discontinuously allowing isolating the single sintering phase. In this way, a better separation of the non-ferrous metals is obtained which are produced as oxides of known and precise structure and therefore do not constitute a waste anymore but are a reusable product instead.
  • the yield into non-ferrous metals is in the range of 20%, while with the earlier state of the art's grate devices the yield was of 5-6%. With the method according to the invention not only do the non-ferrous oxides get separated very easily from the iron ones, but furthermore the insertion of sintered material directly into the high temperature furnace is allowed.
  • the sintered materials are inserted into the furnace at a temperature of about 100°C, while the sintered product according to the invention is instead inserted at a temperature of 800-1000°C.
  • a furnace's output depends on the product's preheating that can be achieved, while inserting the material at a higher temperature production of pig iron with a smaller quantity of coke (6-8% less) can be obtained.
  • the sintered product becomes rich in coke that allows reducing the use of additional coke normally added in the furnaces to the load inserted into their crucible at the beginning of the process, defined as "coke bed".
  • the insertion of the sintered product at such high temperatures also allows the separation of possible non-ferrous oxides residuals that are separated by volatilization in the upper part of the furnace and conveyed, passing through the cooler 12, into the filters set 13.
  • the insertion into the furnace 8 can occur with a 10% pig iron's presence that, having a longer melting time, allows the passage of the reduced flue gases coming from the crucible.
  • the sintered product were to be loaded alone it would melt immediately preventing the flue gases' passage.
  • limestone gets also inserted into the furnace in order to make the slag more fluid.
  • the method according to the invention and subsequently the plant for its operation can be inserted into a steel mill.
  • the pig iron obtained can be loaded into a steel mills' electric furnace. Is therefore clear the advantage of conceiving the method and the plant according to the invention as supplementing parts of the steel mills, that is the flue gas treatment on the spot and the pig iron use also in situ.
  • the method and plant's detailed description like, for example, other means, in order to move the mass from one station to the next, can be used in replacement of the closed loop carrier belt on which the various containers fit to carry out the different plant's stations are fixed to, without likewise falling out of the scope of protection, as also recited in the following appended claims.

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

Abstract

Procédé permettant de traiter les poussières de gueulard de fours électriques lors de la production de fonte brute, qui consiste à stocker les poussières obtenues par filtrage des gaz de fumées d'aciéries électriques avec les poussières d'un produit riche en oxydes de fer et un composé carboné, à mélanger le produit stocké, à transformer la masse ainsi obtenue en boulettes, à fritter le produit en boulettes, et à décharger le produit en boulettes dans un four à coke produisant une fonte brute. La phase de frittage est effectuée en au moins trois sous-phases séparées et indépendantes, à savoir le chargement du produit en boulettes, le déclenchement du frittage et la réduction des oxydes dans des conditions contrôlées d'air et de température, le produit en boulettes étant à l'état statique pendant toute la phase. L'installation destinée à la mise en oeuvre dudit procédé comporte trois silos (2, 3, 4) pour le stockage. Ces trois silos sont raccordés à au moins un mélangeur (5) adapté pour décharger le composé obtenu dans un dispositif de transformation (6) en boulettes. Ce dispositif de transformation en boulettes est équipé d'un moyen adapté pour décharger le produit en boulettes dans un dispositif de frittage (16) équipé d'un moyen permettant de décharger directement ou indirectement le produit fritté dans un four (8). Le dispositif de frittage (16) comporte un ensemble de trois postes (9, 10, 11), indépendants les uns des autres, qui sont capables d'effectuer les sous-phases séparées consistant à charger la masse, à déclencher le frittage de la masse et à fritter ladite masse. Au moins deux desdits postes (10, 11) situés après le premier (9) maintiennent la masse immobile dans des conditions contrôlées d'air et de température.
PCT/EP2002/007052 2001-06-29 2002-06-25 Procede permettant de traiter les poussieres de gueulard de fours electriques de fonte de fer d'acieries Ceased WO2003002775A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002317847A AU2002317847A1 (en) 2001-06-29 2002-06-25 Method and plant for treating flue gas dust of electric steelmaking furnaces and steel mills using pelletization

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2001A001381 2001-06-29
IT2001MI001381A ITMI20011381A1 (it) 2001-06-29 2001-06-29 Procedimento di trattamento delle polveri contenute nei fumi di acciaieria con produzione di ghisa

Publications (2)

Publication Number Publication Date
WO2003002775A2 true WO2003002775A2 (fr) 2003-01-09
WO2003002775A3 WO2003002775A3 (fr) 2003-11-20

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PCT/EP2002/007052 Ceased WO2003002775A2 (fr) 2001-06-29 2002-06-25 Procede permettant de traiter les poussieres de gueulard de fours electriques de fonte de fer d'acieries

Country Status (3)

Country Link
AU (1) AU2002317847A1 (fr)
IT (1) ITMI20011381A1 (fr)
WO (1) WO2003002775A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007134859A3 (fr) * 2006-05-24 2008-03-27 Saudi Basic Ind Corp Procédé de recyclage de sous-produits porteurs de fer dans la sidérurgie, granulés issus d'un tel procédé et utilisation correspondante

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110055361B (zh) * 2019-06-10 2020-12-01 成渝钒钛科技有限公司 焦丁高炉应用技术方法

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US3262771A (en) * 1963-06-20 1966-07-26 Mcdowell Wellman Eng Co Recovery of steel and zinc from waste materials
US3313617A (en) * 1964-02-06 1967-04-11 Mcdowell Wellman Eng Co Iron-containing flux material for steel-making process
US3836353A (en) * 1968-10-18 1974-09-17 C Holley Pellet reclamation process
US3770416A (en) * 1972-04-17 1973-11-06 Univ Michigan Tech Treatment of zinc rich steel mill dusts for reuse in steel making processes
GB1422232A (en) * 1973-01-10 1976-01-21 Harsco Corp Process and system for producing metalized agglomerates and recovery of non-ferrous values from waste materials
JPS532121B2 (fr) * 1973-07-02 1978-01-25
JPS52111811A (en) * 1976-03-17 1977-09-19 Kobe Steel Ltd Preparation of sintered ore of low zinc content
DE3042941C2 (de) * 1980-11-14 1984-11-22 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zum Abtrennen von Nichteisenmetallen aus eisenhaltigen Stoffen
CA1239020A (fr) * 1984-01-26 1988-07-12 Tadamitu Nagayasu Methode d'extraction du zinc a partir d'un compose de zinc
JPH10330852A (ja) * 1997-06-05 1998-12-15 Nippon Steel Corp 含亜鉛製鉄ダストの脱亜鉛塊成化方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007134859A3 (fr) * 2006-05-24 2008-03-27 Saudi Basic Ind Corp Procédé de recyclage de sous-produits porteurs de fer dans la sidérurgie, granulés issus d'un tel procédé et utilisation correspondante
WO2007134725A3 (fr) * 2006-05-24 2008-04-03 Saudi Basic Ind Corp Procédé de recyclage de sous-produits à base de fer dans l'industrie sidérurgique, boulette obtenue au moyen de ce procédé et son utilisation
CN101466853A (zh) * 2006-05-24 2009-06-24 沙特基础工业公司 用于钢铁工业的含铁副产品的工艺，以及由该工艺获得的球团及其应用
US9011573B2 (en) 2006-05-24 2015-04-21 Saudi Basic Industries Corporation Process for recycling of steel industry iron bearing by-products, pellet obtained in that process and use thereof

Also Published As

Publication number Publication date
ITMI20011381A1 (it) 2002-12-29
AU2002317847A1 (en) 2003-03-03
ITMI20011381A0 (it) 2001-06-29
WO2003002775A3 (fr) 2003-11-20

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