WO2008052232A1 - Iron oxide sintering process for spray roast oxide with exhaust gas recirculation - Google Patents

Iron oxide sintering process for spray roast oxide with exhaust gas recirculation Download PDF

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Publication number
WO2008052232A1
WO2008052232A1 PCT/AT2007/000492 AT2007000492W WO2008052232A1 WO 2008052232 A1 WO2008052232 A1 WO 2008052232A1 AT 2007000492 W AT2007000492 W AT 2007000492W WO 2008052232 A1 WO2008052232 A1 WO 2008052232A1
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Prior art keywords
sintering
iron oxide
plant
temperature
hydrochloric acid
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PCT/AT2007/000492
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German (de)
French (fr)
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Gerhard Frithum
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Gerhard Frithum
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Publication of WO2008052232A1 publication Critical patent/WO2008052232A1/en

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/36—Regeneration of waste pickling liquors
    • 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
    • C22B1/16—Sintering; Agglomerating
    • 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
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • C22B1/205—Sintering; Agglomerating in sintering machines with movable grates regulation of the sintering process
    • 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
    • C22B7/001—Dry processes
    • 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
    • C22B7/006—Wet processes
    • 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 invention relates to a process for sintering pulverulent iron oxides obtained from hydrochloric acid waste liquors in spray bars, in order to bring them into a form which is suitable for recycling in the steelmaking process, ie a compact, lumpy form.
  • Spray roasters for the Ruthner or Woodall-Duckham processes for the recycling of so-called hydrochloric acid waste liquors, which are also referred to herein as hydrochloric acid regeneration plants, are known from the prior art and are used worldwide. These are primarily used to obtain hydrochloric acid (HCl), wherein powdered iron oxide (Fe 2 O 3 ) is obtained as a by-product. The resulting in the Sprühöstanlagen iron oxide represents the appropriate quality is a salable product, which is used for the most part for the production of magnetic materials.
  • the Sprüh ⁇ st process is superior to the fluidized bed process in some significant respects, but due to the limited usability of the by-produced powdery iron oxide, the fluidized bed process is preferable in many cases.
  • the powdered iron oxide of a Sprix ⁇ ststrom could, for example, a Sintering are supplied, as used in iron and steel production for fine ores.
  • these sintering plants are designed for iron ores, the use of powdered iron oxide from Sprühöstanlagen is therefore severely limited for quality or economic reasons.
  • the present invention relates to a process which makes it possible to convert pulverulent iron oxides from spray roasters immediately after the acid regeneration in an economical manner into a compact, lumpy form.
  • the iron oxide leaving the acid regeneration process can have a temperature of 100 to 800 ° C., usually 300 to 400 ° C. or about 350 ° C., at the reactor outlet and is mixed with additives for improving the sintering process and / or for economic reasons and then fed to a sintering furnace.
  • These aggregates can be used to improve the sintering process and / or for economic reasons and then fed to a sintering furnace.
  • carbonaceous materials such as coke or coal, in an amount of 5-50%, preferably in powdery form, as an energy source for achieving the necessary sintering temperature and / or for accelerating the sintering process,
  • Means for lowering the sintering temperature and / or slag formers, as used in steelmaking, such as oxides / silicates of alkali / alkaline earth metals or silicon include.
  • the powder mixture may be subjected to pre-compaction prior to sintering, such as briquetting, pelletization, press granulation, extrusion. In this case, it is not necessary to supply the iron oxide to a crusher at the time of sintering.
  • the iron oxide is produced by means of a burner using gaseous (eg liquid gas, Natural gas) or liquid fuels (eg oil) brought to the sintering temperature, sintered, then, if no pre-compaction took place, crushed and brought into shape required for further processing and cooled, so as to meet the requirements for processing in the steel process (" Pig Iron ").
  • gaseous eg liquid gas, Natural gas
  • liquid fuels eg oil
  • a carbonaceous fuel preferably coal or coke, may be added to the iron oxide prior to sintering to achieve the necessary sintering temperature and / or to promote sintering.
  • the sintered alumina can be operated either continuously (e.g., as a sintered belt) or batch-wise, with the continuous process being preferred for better controllability.
  • the hot exhaust gases emerging from the sintering device can be returned to the regeneration reactor, resulting in improved energy efficiency and exhaust gas purification of the sintering furnace exhaust gas.
  • the gas conduction (preferably at reduced pressure) can take place through the sintering plant by means of a fan used in the regeneration process, for example an induced draft blower.
  • the air flow can be done by a separate fan and a separate exhaust gas purification include (venturi scrubber).
  • the washing water from this exhaust gas purification can be recycled due to the chloride content in the regeneration process, for example by column task o- the fan injection.
  • the figure shows a preferred embodiment of the method according to the invention.
  • the iron-containing waste acid 1 (to be regenerated) from the steel pickling process is converted after concentration 2 an injection device 3 in the Sprühöstreaktor 4, hereinafter referred to as reactor 4, injected from above.
  • reactor 4 an injection device 3 in the Sprühöstreaktor 4, hereinafter referred to as reactor 4, injected from above.
  • burners 5 which are mounted laterally on the reactor 4 and protrude into this, the temperature in the reactor 4 is maintained at about 550 0 C.
  • HCl is discharged at the top of the Rekator 4 in gaseous form and subjected to a subsequent absorption and gas scrubbing 6 for the recovery of 18% HCl, as well as to reduce emissions.
  • an induced draft 7 is provided following the gas scrubber unit.
  • the pulverulent iron oxide sinks to the bottom and is discharged via a crusher or a cellular wheel system 8, the temperature of the iron oxide still being approximately 350 ° C. Aggregates are now admixed with this iron oxide in a mixing plant 9 and pre-compaction 10 is carried out with the addition of compacting liquid 11, for example water in an amount of up to 40%.
  • the mixture is then fed to a sintering belt 12, also referred to below as a sintering furnace 12.
  • a sintered iron oxide pellet collecting container 15 is provided at the end of the sintering furnace 12. If necessary, the system also includes a crusher 16 for sintering material (not shown) between sintering belt 12 and collecting container 15.
  • the pressure measurement on the reactor is illustrated by FIG. 18, the pressure measurement in the sintering furnace by 19.
  • the air quantity and the negative pressure are set via a regulating flap for the air supply 20. However, this can be done forcibly via an additional fan 17.
  • the exhaust gases from the sintering plant 12 are conducted through an induced draft fan 21 and a separate gas wash '22, and the water from the gas scrubbing is recycled via a washing water return guide 23 in the regeneration process.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
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Abstract

The invention relates to a process for sintering powdered iron oxides from hydrochloric acid regeneration plants by using the energy content of the iron oxide for the sintering process and the exhaust gases from the sintering plant for the regenerating process, which is distinguished by the fact that the powdered iron oxide leaving the reactor (4) of the hydrochloric acid regeneration plant is fed immediately to a sintering plant (12) after exiting and after optional pre-compacting, and the exhaust gases from the sintering plant (12) are optionally fed back again into the regenerating process.

Description

EISENOXID-SINTERVERFAHREN FÜR SPRÜHRÖSTOXID MIT ICE OXIDE SINTERING METHOD FOR SPRAYING OXIDE WITH
ABGASRÜCKFÜHRUNGEXHAUST GAS RECIRCULATION
Die Erfindung betrifft ein Verfahren zur Sinterung von pulverförmigen, aus salzsauren Beizablaugen in Sprührόstan- lagen erhaltenen Eisenoxiden, um diese in eine für die Rückführung in den Prozess der Stahlherstellung entsprechende, dh eine kompakte, stückige Form zu bringen.The invention relates to a process for sintering pulverulent iron oxides obtained from hydrochloric acid waste liquors in spray bars, in order to bring them into a form which is suitable for recycling in the steelmaking process, ie a compact, lumpy form.
Sprühröstanlagen (z. B. für die Ruthner- oder Woodall- Duckham-Verfahren) zur Wiederaufbereitung sogenannter salzsaurer Beizablaugen, welche hierin auch als Salzsäure-Regenerationsanlagen bezeichnet werden, sind aus dem Stand der Technik bekannt und kommen weltweit zum Einsatz. Diese dienen vornehmlich der Gewinnung von Salzsäure (HCl) , wobei pulverförmiges Eisenoxid (Fe2O3) als Nebenprodukt anfällt. Das in den Sprühröstanlagen anfallende Eisenoxid stellt bei entsprechender Qualität ein verkaufsfähiges Produkt dar, welches zum Grossteil zur Herstellung magnetischer Materialen eingesetzt wird.Spray roasters (eg for the Ruthner or Woodall-Duckham processes) for the recycling of so-called hydrochloric acid waste liquors, which are also referred to herein as hydrochloric acid regeneration plants, are known from the prior art and are used worldwide. These are primarily used to obtain hydrochloric acid (HCl), wherein powdered iron oxide (Fe 2 O 3 ) is obtained as a by-product. The resulting in the Sprühöstanlagen iron oxide represents the appropriate quality is a salable product, which is used for the most part for the production of magnetic materials.
In den letzten Jahren wurden jedoch deutlich mehr Anlagen zur Wiederaufbereitung von salzsauren Beizablaugen installiert, als entsprechender Markt für pulverförmiges Eisenoxid vorhanden ist. Es mussten daher alternative Verfahren zur Wiederaufbereitung eingesetzt werden (z. B. die KCH-Fliessbett- oder Lurgi-Fliessbett-Verfahren) , bei welchen das Eisenoxid in grobkörniger Form anfällt, sodass es in der Eisen- und Stahlerzeugung wieder als Rohmaterial einsetzbar ist.In recent years, however, significantly more plants for the recovery of hydrochloric acid waste liquors have been installed, as the corresponding market for powdered iron oxide is present. Therefore alternative methods of reprocessing had to be used (eg the KCH fluidised bed or Lurgi fluidized bed process), where the iron oxide is obtained in coarse-grained form, so that it can be reused as raw material in iron and steel production.
Obwohl das Sprührδst-Verfahren dem Fliessbett-Verfahren in einigen wesentlichen Punkten überlegen ist, ist aber aufgrund der eingeschränkten Verwertbarkeit des als Nebenprodukt anfallenden pulverförmigen Eisenoxids das Fliessbett-Verfahren in vielen Fällen vorzuziehen. Es sei denn, dass das pulverförmige Eisenoxid einer Sprührδstanlage könnte beispielsweise einer Sinteranlage zugeführt werden, wie sie in der Eisen- und Stahlherstellung für Feinerze verwendet werden. Allerdings sind diese Sinteranlagen auf Eisenerze ausgelegt, der Einsatz von pulverförmigem Eisenoxid aus Sprühröstanlagen ist daher aus Qualitäts- oder Wirtschaftlichkeitsgründen stark eingeschränkt .Although the Sprühδst process is superior to the fluidized bed process in some significant respects, but due to the limited usability of the by-produced powdery iron oxide, the fluidized bed process is preferable in many cases. Unless the powdered iron oxide of a Sprührδstanlage could, for example, a Sintering are supplied, as used in iron and steel production for fine ores. However, these sintering plants are designed for iron ores, the use of powdered iron oxide from Sprühöstanlagen is therefore severely limited for quality or economic reasons.
Die vorliegende Erfindung betrifft ein Verfahren, das es ermöglicht, pulverförmige Eisenoxide aus Sprühröstanlagen unmittelbar nach der Säure-Regeneration in wirtschaftlicher Weise in eine kompakte, stückige Form überzuführen.The present invention relates to a process which makes it possible to convert pulverulent iron oxides from spray roasters immediately after the acid regeneration in an economical manner into a compact, lumpy form.
Das aus dem Säure-Regenerationsverfahren austretende Eisenoxid kann am Reaktoraustritt eine Temperatur von 100 bis 8000C, üblicherweise von 300 bis 4000C oder von ungefähr 3500C aufweisen, und wird zur Verbesserung des Sinterungsvorgangs und/oder aus wirtschaftlichen Gründen mit Zuschlagstoffen vermischt und anschließend einem Sinterofen zugeführt . Diese Zuschlagstoffe könnenThe iron oxide leaving the acid regeneration process can have a temperature of 100 to 800 ° C., usually 300 to 400 ° C. or about 350 ° C., at the reactor outlet and is mixed with additives for improving the sintering process and / or for economic reasons and then fed to a sintering furnace. These aggregates can
- kohlenstoffhaltige Materialien, wie beispielsweise Koks oder Kohle, in einem Anteil von 5-50%, vorzugsweise in pulvriger Form, als Energiequelle zum Erzielen der notwendigen Sintertemperatur und/oder zum Beschleunigen des Sinterungsvorgangs,carbonaceous materials, such as coke or coal, in an amount of 5-50%, preferably in powdery form, as an energy source for achieving the necessary sintering temperature and / or for accelerating the sintering process,
- Mittel zum Herabsetzen der Sintertemperatur und/oder Schlackenbildner, wie sie auch bei der Stahlherstellung eingesetzt werden, wie Oxide/Silikate der Alkali-/Erdalkalimetalle oder Silizium, umfassen.- Means for lowering the sintering temperature and / or slag formers, as used in steelmaking, such as oxides / silicates of alkali / alkaline earth metals or silicon include.
In einer bevorzugten Ausführungsform kann das Pulvergemisch vor der Sinterung einer Vor-Kompaktierung unterzogen werden, wie beispielsweise einer Brikettierung, einer Pelleti- sierung, einer Pressgranulierung, einer Extrusion. In diesem Fall ist es nicht erforderlich, das Eisenoxid am Anschluss an die Sinterung einer Brechereinrichtung zuzuführen.In a preferred embodiment, the powder mixture may be subjected to pre-compaction prior to sintering, such as briquetting, pelletization, press granulation, extrusion. In this case, it is not necessary to supply the iron oxide to a crusher at the time of sintering.
Wie bei den aus der Stahlindustrie bekannten Sinterverfahren wird bei der vorliegenden Erfindung das Eisenoxid mittels eines Brenners unter Einsatz von gasförmigen (z.B. Flüssiggas, Erdgas) oder flüssigen Brennstoffen (z.B Öl) auf die Sintertemperatur gebracht, gesintert, anschließend, sofern keine Vor-Kompaktierung erfolgte, zerkleinert und in für die Weiterverarbeitung notwendige Form gebracht und abgekühlt, um so den Anforderungen für die Verarbeitung im Stahlprozess zu entsprechen ("Pig Iron") . Gewünschtenfalls kann dem Eisenoxid vor der Sinterung zusätzlich ein kohlenstoffhaltiger Brennstoff, vorzugsweise Kohle oder Koks, zum Erzielen der notwendigen Sintertemperatur und/oder zum Beschleunigen der Sinterung zugemischt werden.As with the sintering processes known from the steel industry, in the present invention the iron oxide is produced by means of a burner using gaseous (eg liquid gas, Natural gas) or liquid fuels (eg oil) brought to the sintering temperature, sintered, then, if no pre-compaction took place, crushed and brought into shape required for further processing and cooled, so as to meet the requirements for processing in the steel process (" Pig Iron "). If desired, a carbonaceous fuel, preferably coal or coke, may be added to the iron oxide prior to sintering to achieve the necessary sintering temperature and / or to promote sintering.
Der Sinteroferi kann entweder kontinuierlich (z.B. als Sinterband) oder diskontinuierlich (chargenweise) betrieben werden, wobei das kontinuierliche Verfahren aufgrund der besseren Regulierbarkeit bevorzugt wird.The sintered alumina can be operated either continuously (e.g., as a sintered belt) or batch-wise, with the continuous process being preferred for better controllability.
In einer weiteren bevorzugten Ausführungsform können die aus der Sintervorrichtung austretenden heißen Abgase in den Regenerations-Reaktor zurückgeführt werden, womit sich eine verbesserte Energie-Effizienz sowie eine Abgasreinigung des Sinterofen-Abgases ergibt. Dabei kann die Gasführung (bevorzugt bei Unterdruck) durch die Sinteranlage durch einen im Re- generations-Verfahren eingesetzten Ventilator, beispielsweise ein Saugzuggebläse, erfolgen. Alternativ kann die Luftführung durch einen eigenen Ventilator erfolgen und eine getrennte Abgasreinigung umfassen (Venturi-Wäscher) . Das Waschwasser aus dieser Abgasreinigung kann aufgrund des Chloridgehaltes in den Regenerationsprozess, beispielsweise durch Kolonnenaufgabe o- der Ventilatoreindüsung, rückgeführt werden.In a further preferred embodiment, the hot exhaust gases emerging from the sintering device can be returned to the regeneration reactor, resulting in improved energy efficiency and exhaust gas purification of the sintering furnace exhaust gas. In this case, the gas conduction (preferably at reduced pressure) can take place through the sintering plant by means of a fan used in the regeneration process, for example an induced draft blower. Alternatively, the air flow can be done by a separate fan and a separate exhaust gas purification include (venturi scrubber). The washing water from this exhaust gas purification can be recycled due to the chloride content in the regeneration process, for example by column task o- the fan injection.
Die vorliegende Erfindung wird anhand des nachstehenden Ausführungsbeispiels unter Bezugnahme auf die Figur im Detail beschrieben.The present invention will be described in detail by way of the following embodiment with reference to the figure.
Die Figur zeigt eine bevorzugte Ausführungsform des erfindungsgemäßen Verfahrens .The figure shows a preferred embodiment of the method according to the invention.
In einer Salzsäure-Regenerationsanlage nach dem Sprühröst- prinzip wird die (zu regenerierende) eisenhaltige Altsäure 1 aus dem Stahl-Beizeprozess nach einer Aufkonzentrierung 2 über eine Eindüsungsvorrichtung 3 in den Sprühröstreaktor 4, nachstehend als Reaktor 4 bezeichnet, von oben eingedüst. Durch einen oder mehrere Brenner 5, die seitlich am Reaktor 4 angebracht sind und in diesen hineinragen, wird die Temperatur im Reaktor 4 auf ungefähr 5500C gehalten. Dadurch wird aus 2PeCl2 + 2H2O +%O2 in einem Röstvorgang 4HCl + Fe2O3. HCl wird oben am Rekator 4 gasförmig abgeführt und einer nachfolgenden Absorption und Gaswäsche 6 zur Rückgewinnung der 18%-igen HCl, sowie zur Emissionsreduktion, unterworfen. Dazu ist im Anschluss an die Gaswäsche-Einheit ein Saugzug 7 vorgesehen. Das pulverför- mige Eisenoxid sinkt zu Boden und wird über einen Brecher oder ein Zellenradsystem 8 ausgetragen, wobei die Temperatur des Eisenoxides noch ungefähr 3500C beträgt. Diesem Eisenoxid werden nun in einer Mischanlage 9 Zuschlagstoffe zugemischt und es wird eine Vor-Kompaktierung 10 unter Zugabe von Kompak- tierflüssigkeit 11, beispielsweise Wasser in einer Menge bis zu 40%, vorgenommen. Die Mischung wird anschließend auf ein Sinterband 12, nachstehend auch als Sinterofen 12 bezeichnet, geführt .In a hydrochloric acid regeneration plant according to the spray roasting principle, the iron-containing waste acid 1 (to be regenerated) from the steel pickling process is converted after concentration 2 an injection device 3 in the Sprühöstreaktor 4, hereinafter referred to as reactor 4, injected from above. By one or more burners 5, which are mounted laterally on the reactor 4 and protrude into this, the temperature in the reactor 4 is maintained at about 550 0 C. This turns 2PeCl 2 + 2H 2 O +% O 2 in a roasting process into 4HCl + Fe 2 O 3 . HCl is discharged at the top of the Rekator 4 in gaseous form and subjected to a subsequent absorption and gas scrubbing 6 for the recovery of 18% HCl, as well as to reduce emissions. For this purpose, an induced draft 7 is provided following the gas scrubber unit. The pulverulent iron oxide sinks to the bottom and is discharged via a crusher or a cellular wheel system 8, the temperature of the iron oxide still being approximately 350 ° C. Aggregates are now admixed with this iron oxide in a mixing plant 9 and pre-compaction 10 is carried out with the addition of compacting liquid 11, for example water in an amount of up to 40%. The mixture is then fed to a sintering belt 12, also referred to below as a sintering furnace 12.
Bei Zumischung von Feinkoks wird dieser über einen Zündbrenner 13 im Sinterofen 12 auf die Sintertemperatur, möglichst unter Ausnutzung der noch enthaltenen Wärme des Eisenoxides von ungefähr 3000C, auf ungefähr 1200 0C gebracht. Die austretenden Abgase, die zum Teil Feinstaub, aber auch flüchtige Metallchloride sowie HCl enthalten können, werden über die Abgasrückführung 14 wieder in den Reaktor 4 zurückgeführt . Dadurch wird bei diesem Verfahren die Abgaswärme des Sinterprozesses für die Röstreaktion im Reaktor 4 genutzt.When admixing fine coke this is about a pilot burner 13 in the sintering furnace 12 to the sintering temperature, possibly taking advantage of the still contained heat of the iron oxide of about 300 0 C, brought to about 1200 0 C. The exiting exhaust gases, some of which may contain particulate matter, but also volatile metal chlorides and HCl, are recycled back to the reactor 4 via the exhaust gas recirculation 14. As a result, the exhaust heat of the sintering process for the roasting reaction in the reactor 4 is used in this method.
Wie in der Figur gezeigt, ist ferner am Ende des Sinterofens 12 ein Sammelcontainer 15 für gesinterte Eisenoxidpellets vorgesehen. Erforderlichenfalls weist die Anlage auch einen zwischen Sinterband 12 und SammelContainer 15 vorgesehenen Brecher 16 für das Sintergut auf (nicht gezeigt) .As shown in the figure, further, a sintered iron oxide pellet collecting container 15 is provided at the end of the sintering furnace 12. If necessary, the system also includes a crusher 16 for sintering material (not shown) between sintering belt 12 and collecting container 15.
Über den Unterdruck im Reaktor, der über ein Saugzug- Gebläse 7 nach der HCl-Absorption eingestellt wird, wird auch das Sinterabgas angesaugt. Die Druckmessung am Reaktor wird durch 18 veranschaulicht, die Druckmessung im Sinterofen durch 19. Die Luftmenge und der Unterdruck werden über eine Regel- Klappe für die Luftzufuhr 20 eingestellt. Dies kann jedoch zwangsweise über ein zusätzliches Gebläse 17 erfolgen.About the negative pressure in the reactor, which is set via a suction fan 7 after the HCl absorption, is also sucked the sintered exhaust gas. The pressure measurement on the reactor is illustrated by FIG. 18, the pressure measurement in the sintering furnace by 19. The air quantity and the negative pressure are set via a regulating flap for the air supply 20. However, this can be done forcibly via an additional fan 17.
In einer weiteren besonderen Ausführungsform werden die Abgase aus der Sinteranlage 12 über ein Saugzuggebläse 21 und eine separate Abgaswäsche '22 geführt, und das Wasser aus der Abgaswäsche wird über eine Waschwasser-Rückführung 23 wieder in den Regenerationsprozess zurückgeführt . In a further particular embodiment, the exhaust gases from the sintering plant 12 are conducted through an induced draft fan 21 and a separate gas wash '22, and the water from the gas scrubbing is recycled via a washing water return guide 23 in the regeneration process.

Claims

PATENTANSPRUCHE PATENT CLAIMS
1. Verfahren zur Sinterung von pulverförmigen Eisenoxiden aus Salzsäure-Regenerationsanlagen unter Ausnutzung des Energieinhalts des Eisenoxids für den Sinterungsprozess sowie der Abgase aus der Sinteranlage für den Regenerationsprozess, dadurch gekennzeichnet, dass das den Reaktor (4) der Salzsäure-Regenerationsanlage verlassende pulverförmige Eisenoxid unmittelbar nach dem Austritt und nach einer wahlweisen Vor- Korapaktierung einer Sinteranlage (12) zugeführt wird, und die Abgase aus der Sinteranlage (12) wahlweise wieder in den Regenerationsprozess zurückgeführt werden.1. A process for sintering powdered iron oxides from hydrochloric acid regeneration plants using the energy content of the iron oxide for the sintering process and the exhaust gases from the sinter plant for the regeneration process, characterized in that the reactor (4) of the hydrochloric acid regeneration system leaving powdered iron oxide immediately after the outlet and after an optional pre-lactation of a sintering plant (12) is supplied, and the exhaust gases from the sintering plant (12) are selectively returned to the regeneration process.
2. Verfahren nach Anspruch 1 dadurch gekennzeichnet, dass die Temperatur des Eisenoxides am Reaktoraustritt (8) von 1000C bis 8000C, üblicherweise von 3500C bis 4000C, beträgt.2. The method according to claim 1, characterized in that the temperature of the iron oxide at the reactor outlet (8) of 100 0 C to 800 0 C, usually from 350 0 C to 400 0 C, is.
3. Verfahren nach Anspruch 1 oder 2 , dadurch gekennzeichnet, dass dem Eisenoxid vor der Sinterung Zuschlagstoffe zum Herabsetzen der Sintertemperatur und/oder zum Erniedrigen der Schmelztemperatur zugemischt werden.3. The method according to claim 1 or 2, characterized in that the iron oxide before sintering additives are added to reduce the sintering temperature and / or to lower the melting temperature.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass dem Eisenoxid Zuschlagstoffe zum Erhöhen der Festigkeit des gesinterten Eisenoxides oder Schlackenbildner zugemischt werden.4. The method according to any one of claims 1 to 3, characterized in that the iron oxide additives for increasing the strength of the sintered iron oxide or slag are added.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass zum Erhitzen des Eisenoxids auf Sintertemperatur Brenner (13) eingesetzt werden.5. The method according to any one of claims 1 to 4, characterized in that are used for heating the iron oxide to sintering temperature burner (13).
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass dem Eisenoxid vor der Sinterung zusätzlich ein kohlenstoffhaltiger Brennstoff, vorzugsweise Kohle oder Koks, zum Erzielen der notwendigen Sintertemperatur und/- oder zum Beschleunigen der Sinterung zugemischt wird. 6. The method according to any one of claims 1 to 5, characterized in that the iron oxide before sintering additionally a carbonaceous fuel, preferably coal or coke, to achieve the necessary sintering temperature and / - or to accelerate the sintering is added.
PCT/AT2007/000492 2006-10-31 2007-10-25 Iron oxide sintering process for spray roast oxide with exhaust gas recirculation WO2008052232A1 (en)

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