WO2000044947A1 - Verfahren zur herstellung von flüssigem roheisen - Google Patents
Verfahren zur herstellung von flüssigem roheisen Download PDFInfo
- Publication number
- WO2000044947A1 WO2000044947A1 PCT/EP1999/008654 EP9908654W WO0044947A1 WO 2000044947 A1 WO2000044947 A1 WO 2000044947A1 EP 9908654 W EP9908654 W EP 9908654W WO 0044947 A1 WO0044947 A1 WO 0044947A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- zinc
- zone
- generator
- iron
- Prior art date
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
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
- C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
- C21B13/002—Reduction of iron ores by passing through a heated column of carbon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
-
- 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 the production of molten pig iron or steel raw material, in which feedstocks formed from lumpy iron oxide-containing material and optionally additives are reduced to sponge iron in a direct reduction zone by means of a reducing gas, the sponge iron in a meltdown gasification zone with the addition of carbon carriers and oxygen-containing gases, if necessary previous finished reduction, melted into molten pig iron and a CO and H 2 -containing generator gas is generated, which is withdrawn from the smelting gasification zone and, after dedusting, introduced as a reducing gas into the direct reduction zone, converted there, removed as top gas from the direct reduction zone, subjected to a gas scrubbing and is supplied to a consumer as an export gas, a partial stream of the dedusted reducing gas likewise being subjected to gas scrubbing.
- Metallurgical residues such as converter and electric furnace dusts or sludges, which mainly consist of iron oxides, cannot currently be used in one of the iron and steelmaking units in a metallurgical plant due to their content of zinc and other heavy metals.
- a blast furnace for example, there would be an undesirable accumulation of zinc (so-called "Zinkelend").
- Zinkelend zinc accumulation of zinc
- the AT 388 390 B is based on the problem of dezincing the material flow when operating a pig iron production plant.
- the plant is formed by a double unit consisting of a direct reduction shaft and a melter, whereby the reducing gas formed in the melter is dedusted and dezincified in two stages, with low-zinc dust being separated in the first stage and zinc-rich dust in the second stage.
- This process offers no possibility of using zinc-containing steel mill dusts beyond the dezincing of the reducing gas.
- the proposed method of two-stage exhaust gas dedusting and dezincification is complex and expensive in terms of apparatus.
- the object of the present invention is therefore to avoid the problems described in the prior art and to create a method mentioned at the outset which makes it possible to use the iron content of zinc-containing metallurgical dusts despite the zinc contained therein and at the same time to maintain the quality of the pig iron produced.
- the method should also be simple and inexpensive to operate in terms of apparatus.
- This object is achieved in that a) agglomerates formed by zinc and iron oxide-containing feedstocks are introduced into the direct reduction zone and / or the meltdown gasification zone, and / or b) zinc-containing dusts are blown into the generator gas which is drawn off or to be withdrawn from the meltdown gasification zone, where oxidic proportions of the zinc-containing feedstocks / dusts are reduced and zinc is vaporized and co-sensed by the generator gas, and in the gas scrubbing zinc is separated from the reducing gas as zinc-containing sludge when the dedusted reducing gas is scrubbed.
- the sludge separated during the gas washing of the dedusted reducing gas has a high zinc content and can be recycled with or without further concentration.
- Zinc-containing metallurgical dusts are used in particular as zinc-containing dusts, which are produced in the course of a pig iron and / or steel production process and / or downstream processes.
- the method according to the invention is not limited to the use of this zinc-containing iron dust.
- Zinc-containing can always be understood to mean both containing zinc oxide (ZnO) and containing metallic zinc (Zn).
- Zinc-containing metallurgical dusts initially usually have both ZnO and Zn, the ZnO content being reduced to Zn immediately after being blown into the generator gas and then also initially being present as Zn in the separated sludge. However, this is largely oxidized again to ZnO by the action of water and atmospheric oxygen during further processing of the sludge.
- part of the zinc is probably recycled to a certain extent between the melting gasification zone and the dedusting system.
- the recycled zinc since there is an equilibrium between the recycled zinc and the proportion of the zinc that is carried along with the reducing gas, there can be no accumulation of zinc in the melter.
- the quality of the pig iron produced is not adversely affected by zinc contamination, since the temperatures prevailing in the melting gasification zone ensure that zinc is present in gaseous form and does not come into contact with liquid pig iron.
- At least a partial flow of the zinc-containing sludge separated during the gas washing of the dedusted reducing gas is transported into a thickener and there at least partially, i.e. to a residual moisture content, dewatered.
- the reduction of the water content in the separated sludge contributes significantly to an improved handling of the sludge and to its less complex and inexpensive further processing.
- separated zinc-containing sludge and / or partially dewatered zinc-containing sludge optionally together with other dusts and / or slurries produced in the course of a pig iron and / or steel manufacturing process, are agglomerated, in particular granulated or briquetted.
- the agglomerates formed can be better used in further processes, for example working up the zinc content contained.
- the properties required by the agglomerates are decisive, in particular their mechanical and thermal stability.
- pelleting the sludge is also a possible procedure.
- a preferred further use according to the invention of the agglomerates formed consists in introducing them into the direct reduction zone and / or the melting gasification zone.
- the additional introduction of the zinc-containing agglomerates leads, assuming a constant flow of zinc dust into the generator gas, to re-establishing the equilibrium between the circulated zinc and the zinc carried with the reducing gas.
- the sludge separated in the gas scrub is enriched with zinc, or can, if a constant proportion of the sludge from the cycle gas scrubber thickener agglomeration (direct reduction zone) -
- Melting gasification zone is discharged, a constantly high zinc concentration of the sludge can be set.
- the sludge deposited according to the invention has a high zinc concentration, it is also outstandingly suitable for commercial use, for example in a zinc smelter.
- the process according to the invention is accordingly advantageously characterized in that a partial stream of the zinc-containing sludge separated off in the gas scrubbing, if appropriate after prior partial dewatering and / or drying, and if appropriate after prior agglomeration, is fed to a zinc recovery.
- a further advantage of the embodiment of the method according to the invention, in which zinc-containing dusts are introduced by blowing into the generator gas, is characterized in that at least a part, preferably at least 50%, of the cooling required for the generator gas from that which is blown into the generator gas Dust is caused.
- the zinc-containing metallurgical dust By blowing the zinc-containing metallurgical dust into the generator gas, the latter is cooled on the one hand by the heating of the dust and on the other hand by the reduction of the ZnO content to Zn. By blowing in dust from the smelter, the cooling gas flow can be largely reduced.
- the reduction in the cooling gas flow also results in a decrease in the amount of sludge deposited in the gas scrubbing of the dedusted reducing gas, with increasing zinc concentration of the sludge.
- the temperatures in the direct reduction zone are in each case kept below the boiling point of liquid zinc, preferably at least 50 ° C. below this temperature.
- a reduction shaft furnace 1, or its direct reduction zone 2 is charged with zinc and iron oxide-containing agglomerates 41 together with other feed materials formed from lumpy, iron oxide-containing material 4 and additives 5 by means of a charging device 3.
- a reduction gas is fed to the reduction shaft furnace 1 via reduction gas lines 6, which flows through the feed materials in countercurrent from bottom to top and reduces the iron oxide and zinc oxide-containing material 4 to sponge iron or to metallic zinc.
- the metallic zinc is present in liquid form in the iron sponge formed from zinc and iron oxide-containing metallurgical residues within the iron sponge matrix or on its surface without evaporating.
- Used or partially reacted reducing gas is withdrawn from the reduction shaft furnace 1 via a top gas line 7 and subjected to a top gas scrubbing 9 in a top gas scrubber 8.
- the washed top gas which is now referred to as export gas, is available to a consumer via an export gas line 10.
- the reaction products from the direct reduction zone 2 sponge iron including the sponge iron formed from iron oxide and zinc-containing agglomerates, as well as burned additives, are discharged from the reduction shaft furnace 1 by means of discharge elements 11 and fed to a melter gasifier 13 via downpipes 12.
- the melter gasifier 13 is further fed solid carbon-containing material 15 from a bunker 14 and optionally feedstocks consisting of zinc-containing agglomerates 41 via a transport device 16.
- the carbon-containing material 15 is gasified with the supply of oxygen-containing gas, which is blown in via a multiplicity of oxygen gas lines 18, and the sponge iron is optionally first reduced and melted.
- the metallic zinc of the iron sponge formed from zinc and iron oxide-containing metallurgical residues changes into the gas phase under the conditions prevailing in the melting gasification zone.
- Liquid pig iron 19 and liquid slag 20 collect below the melting gasification zone 17 and are tapped off via a tap 21.
- the generator gas formed during the gasification of the carbonaceous material in the meltdown gasification zone 17, as well as the zinc vapor contained therein, is withdrawn from the meltdown gasifier 13 via a generator gas line 22 and subjected to dedusting 24 in a hot gas cyclone 23.
- the dust that is separated off is returned to the melter gasifier 13 via a dust return line 25.
- An excess gas line 26 branches off from the reduction gas line 6, by means of which a partial flow of the reduction gas is fed to an excess gas scrubber 27.
- a cooling gas line 29 branches off from the excess gas line 26 and contains a compressor 28 and opens before the hot gas cyclone 23 into the generator gas line 22, whereby cooling gas is supplied to the generator gas for temperature adjustment.
- the generator gas line 22 is associated with a device 30 known as a fine ore injection system, by means of which zinc-containing dusts 31 are blown into the generator gas.
- both the ZnO and the iron oxide content of the zinc carriers introduced into the process are reduced to the respective metals, although the zinc passes into the gas phase and is carried along with the other dust particles by the generator gas.
- the temperature is adjusted to about 800-850 ° C. by means of cooling gas.
- the greater part of the zinc condenses approximately 80%
- the dust deposited in the hot gas cyclone 23 is introduced back into the melter gasifier 13 via the dust return line 25.
- the smaller part of the reducing gas is washed in the excess gas scrubber 27, with zinc-containing sludge being separated off, which is fed to a thickener 33 via a sludge line 32.
- a sludge line 32 leaving the excess gas scrubber 27 there opens another sludge line 34 by means of which sludge separated in the top gas scrubber 8 is also fed to the thickener 33.
- the sludge is partially dewatered to a residual moisture content and then reused.
- This recycling can be, for example, a commercial recycling 35 or a zinc recovery 36.
- the sludge dewatered / dried to an acceptable residual moisture content can advantageously be briquetted using a suitable binder.
- these briquettes are fed back into the process by way of the other starting materials via the direct reduction zone or directly into the melt-down gasification zone.
- the non-returned part of the briquettes is directly or indirectly subjected to further processing.
- the partially dewatered zinc-containing sludge is optionally fed to an agglomeration 39 together with non-dewatered zinc-containing sludge and / or further sludge and / or laundry sludge and only then for commercial use and / or zinc recovery and / or via a delivery line 40 fed to the bunker 14 for the carbonaceous material 15 and thus ultimately reinserted into the melter 13.
- the zinc is concentrated in the separated sludge, so that the commercial utilization 35 and / or the zinc Recovery 36 supplied agglomerates and / or sludges have a higher zinc content.
- the ratio of the zinc deposited in the hot gas cyclone 23 to the entrained zinc was approximately 4: 1.
- transport device 16 introduced into the melter gasifier 13 and otherwise proceed as above.
- the invention is not limited to the exemplary embodiment shown in FIG. 1, but also encompasses all means known to the person skilled in the art which can be used to implement the invention.
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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)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99960969A EP1153148A1 (de) | 1999-01-28 | 1999-11-11 | Verfahren zur herstellung von flüssigem roheisen |
AU17750/00A AU1775000A (en) | 1999-01-28 | 1999-11-11 | Method for producing liquid pig iron |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0011899A AT407162B (de) | 1999-01-28 | 1999-01-28 | Verfahren zur herstellung von flüssigem roheisen |
ATA118/99 | 1999-01-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000044947A1 true WO2000044947A1 (de) | 2000-08-03 |
Family
ID=3482003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/008654 WO2000044947A1 (de) | 1999-01-28 | 1999-11-11 | Verfahren zur herstellung von flüssigem roheisen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1153148A1 (de) |
AT (1) | AT407162B (de) |
AU (1) | AU1775000A (de) |
TW (1) | TW505700B (de) |
WO (1) | WO2000044947A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1826281A1 (de) * | 2006-02-24 | 2007-08-29 | Paul Wurth S.A. | Verfahren zur Herstellung von flüssigem Roheisen oder flüssigen Stahlvorprodukten in einem Einschmelzvergaser |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2726175C1 (ru) * | 2016-09-20 | 2020-07-09 | Мидрэкс Текнолоджиз, Инк. | Способы и системы для повышения содержания углерода в губчатом железе в восстановительной печи |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4940487A (en) * | 1988-04-08 | 1990-07-10 | Voest-Alpine Stahl Donawitz Gesellschaft M.B.H. | Process for utilizing of zinc-containing metallurgical dusts and sludges |
US5435832A (en) * | 1993-05-07 | 1995-07-25 | Deutsche Voest-Alpine | Process for utilising iron-containing wastes or residues |
US5445668A (en) * | 1992-05-21 | 1995-08-29 | Voest-Alpine Industrieanlagenbau G.M.H | Method of producing molten pig iron or molten steel pre-products |
US5470375A (en) * | 1993-06-30 | 1995-11-28 | Bechtel Group, Inc. | Method of processing waste material containing non ferrous metal oxides |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59142875A (ja) * | 1983-02-03 | 1984-08-16 | 住友金属工業株式会社 | 高炉ダストの脱亜鉛方法 |
-
1999
- 1999-01-28 AT AT0011899A patent/AT407162B/de not_active IP Right Cessation
- 1999-11-11 WO PCT/EP1999/008654 patent/WO2000044947A1/de not_active Application Discontinuation
- 1999-11-11 AU AU17750/00A patent/AU1775000A/en not_active Abandoned
- 1999-11-11 EP EP99960969A patent/EP1153148A1/de not_active Withdrawn
- 1999-11-29 TW TW88121027A patent/TW505700B/zh active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4940487A (en) * | 1988-04-08 | 1990-07-10 | Voest-Alpine Stahl Donawitz Gesellschaft M.B.H. | Process for utilizing of zinc-containing metallurgical dusts and sludges |
US5445668A (en) * | 1992-05-21 | 1995-08-29 | Voest-Alpine Industrieanlagenbau G.M.H | Method of producing molten pig iron or molten steel pre-products |
US5435832A (en) * | 1993-05-07 | 1995-07-25 | Deutsche Voest-Alpine | Process for utilising iron-containing wastes or residues |
US5470375A (en) * | 1993-06-30 | 1995-11-28 | Bechtel Group, Inc. | Method of processing waste material containing non ferrous metal oxides |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1826281A1 (de) * | 2006-02-24 | 2007-08-29 | Paul Wurth S.A. | Verfahren zur Herstellung von flüssigem Roheisen oder flüssigen Stahlvorprodukten in einem Einschmelzvergaser |
WO2007096267A1 (en) * | 2006-02-24 | 2007-08-30 | Paul Wurth S.A. | Method for producing molten pig iron or steel pre-products in a melter gasifier |
Also Published As
Publication number | Publication date |
---|---|
AU1775000A (en) | 2000-08-18 |
AT407162B (de) | 2001-01-25 |
ATA11899A (de) | 2000-05-15 |
TW505700B (en) | 2002-10-11 |
EP1153148A1 (de) | 2001-11-14 |
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