WO2003083144A1 - Verfahren zur behandlung von legierten kohlenstoffhaltigen eisenschmelzen zur herstellung von stahl - Google Patents
Verfahren zur behandlung von legierten kohlenstoffhaltigen eisenschmelzen zur herstellung von stahl Download PDFInfo
- Publication number
- WO2003083144A1 WO2003083144A1 PCT/EP2003/001814 EP0301814W WO03083144A1 WO 2003083144 A1 WO2003083144 A1 WO 2003083144A1 EP 0301814 W EP0301814 W EP 0301814W WO 03083144 A1 WO03083144 A1 WO 03083144A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- slag
- decarburization
- melt
- chromium
- carbon
- Prior art date
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
- C21C5/005—Manufacture of stainless steel
-
- 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
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
Definitions
- the invention relates to a process for the treatment of alloyed carbon-containing iron melts for the production of steel, in which a carbon-containing iron melt is subjected to decarburization by adding oxygen in a metallurgical vessel and a subset of the metallic alloy elements is slagged, the metal melt being drawn off from the metallurgical vessel, while the slag remains unreduced in the metallurgical vessel and then the metallurgical vessel is filled with a new batch of molten iron and a decarburization process is carried out again.
- the chromium oxide is reduced by the carbon dissolved in the melt, the carbon monoxide formed being discharged into the gas atmosphere above the melt. Due to the incompleteness of this chromium reduction during decarburization, a subset of the chromium oxide gets into the slag in the form of different spinels. The reduction effect is weakened with continuous decarburization, since the content of carbon as a reduction element decreases over time.
- the economics of the processes are based on recovering the chromium oxide from the slag for the molten metal.
- the slag is reduced with silicon carriers at the end of each decarburization process or every oxygen blowing process.
- high-affinity silicon in the form of FeSi is added to the melt in order to reduce the chromium oxide of the slag with vigorous stirring.
- the chrome content of the metal bath then increases again.
- WO 00/79014 proposes for the recovery of metallic chromium from slags containing chromium oxide, to tap off the slag obtained at the end of a blowing or treatment process in a converter or a vacuum system without reduction and to charge the slag in an electric furnace.
- This electric furnace is also filled with a batch of scrap and any residual dust; carbon and possibly silicon are also added.
- the chromium oxide in the slag is reduced directly to metallic chromium by the added carbon and silicon.
- the conventional treatment step of slag reduction immediately after the first melting process is omitted.
- JP 9184007 describes a treatment method for a melt of a stainless steel using a chromium-rich slag.
- molten pig iron is placed in a vessel with remaining chromium-containing slag from the previous batch and then blown with oxygen.
- the chromium oxide of the slag is reduced by carbon and goes into the melt as metallic chrome.
- the steel is then tapped and the slag remains in the treatment vessel for the next batch.
- the invention is based on the object of further developing a process for the treatment of alloyed carbon-containing iron melts for the production of steel in such a way that the loss of the metallic — expensive — alloy elements due to slagging is small.
- the slagging of chrome in chrome-containing melts should be minimized and the degree of recovery of metallic chrome should be high.
- the slag is increasingly saturated with the metal oxides that occur during several decarburization processes of the melt without intermediate slagging and the slagging of the metallic alloy elements is increasingly counteracted due to the increasing proportion of metal oxides in the slag.
- the treatment takes place without intermediate slagging of the slag, which accumulates over several batches of pig iron and several taps on molten steel. Since no intermediate slagging takes place, the concentration of the metal oxides in the slag increases, an increasing concentration counteracting slagging more and more, i.e. the tendency to metal oxidation decreases.
- the slag does not accumulate proportionally to metal oxides per decarburization process, but less and less slag is advantageously slagged per decarburization process. With complete Saturation of the slag on metal oxides prevents further slagging.
- the proposed process minimizes metal oxidation and recovers metallic alloy elements with high efficiency, i.e. the metal output of the molten steel is high.
- the process is carried out in a known metallurgical vessel, a converter or a vacuum system, using decarburization processes of oxygen, in particular blowing oxygen with a lance.
- the chromium oxide that forms accumulates on a bubble surface or in the focal spot and is reduced with the carbon dissolved in the melt according to the following equation.
- the metallic chromium is returned to the melt and the carbon monoxide is discharged into the gas atmosphere above the melt.
- the proportion of chromium oxide in the slag is increased more and more until the slag is saturated with chromium oxide, during which time a further slagging of metallic chromium is counteracted.
- the slag saturated with chromium oxides is then reduced directly with in particular FeSi according to the following equation.
- the invention relates not only to the recovery of metallic chromium, but also to all other alloy elements, the slagging of which is undesirable.
- the oxygen during decarburization can also be introduced into the treatment vessel through floor nozzles.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Analytical Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture Of Iron (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50300965T DE50300965D1 (de) | 2002-03-28 | 2003-02-22 | Verfahren zur behandlung von legierten kohlenstoffhaltigen eisenschmelzen zur herstellung von stahl |
AU2003206950A AU2003206950A1 (en) | 2002-03-28 | 2003-02-22 | Method for treating alloyed carbonic iron smelts used for the production of steel |
EP03704680A EP1490522B1 (de) | 2002-03-28 | 2003-02-22 | Verfahren zur behandlung von legierten kohlenstoffhaltigen eisenschmelzen zur herstellung von stahl |
AT03704680T ATE301727T1 (de) | 2002-03-28 | 2003-02-22 | Verfahren zur behandlung von legierten kohlenstoffhaltigen eisenschmelzen zur herstellung von stahl |
US10/509,299 US20050166710A1 (en) | 2002-03-28 | 2003-02-22 | Method for treating alloyed carbonic iron smelts used for the production of steel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10213967A DE10213967A1 (de) | 2002-03-28 | 2002-03-28 | Verfahren zur Behandlung von legierten kohlenstoffhaltigen Eisenschmelzen zur Herstellung von Stahl |
DE10213967.9 | 2002-03-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003083144A1 true WO2003083144A1 (de) | 2003-10-09 |
Family
ID=27816034
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/001814 WO2003083144A1 (de) | 2002-03-28 | 2003-02-22 | Verfahren zur behandlung von legierten kohlenstoffhaltigen eisenschmelzen zur herstellung von stahl |
Country Status (11)
Country | Link |
---|---|
US (1) | US20050166710A1 (de) |
EP (1) | EP1490522B1 (de) |
CN (1) | CN1643168A (de) |
AR (1) | AR039135A1 (de) |
AT (1) | ATE301727T1 (de) |
AU (1) | AU2003206950A1 (de) |
DE (2) | DE10213967A1 (de) |
EG (1) | EG23270A (de) |
RU (1) | RU2004131672A (de) |
TW (1) | TW200304494A (de) |
WO (1) | WO2003083144A1 (de) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07216429A (ja) * | 1994-02-03 | 1995-08-15 | Nippon Steel Corp | 脱炭滓を用いたステンレス粗溶鋼の製造方法 |
JPH0885815A (ja) * | 1994-09-16 | 1996-04-02 | Nippon Steel Corp | 脱炭滓を用いた効率的な含クロム溶鋼の精錬方法 |
JPH0987720A (ja) * | 1995-09-29 | 1997-03-31 | Kawasaki Steel Corp | 含クロム溶鋼の脱炭精錬方法 |
-
2002
- 2002-03-28 DE DE10213967A patent/DE10213967A1/de not_active Withdrawn
-
2003
- 2003-02-19 TW TW092103386A patent/TW200304494A/zh unknown
- 2003-02-22 RU RU2004131672/02A patent/RU2004131672A/ru not_active Application Discontinuation
- 2003-02-22 WO PCT/EP2003/001814 patent/WO2003083144A1/de not_active Application Discontinuation
- 2003-02-22 DE DE50300965T patent/DE50300965D1/de not_active Expired - Lifetime
- 2003-02-22 AU AU2003206950A patent/AU2003206950A1/en not_active Abandoned
- 2003-02-22 CN CNA03807365XA patent/CN1643168A/zh active Pending
- 2003-02-22 AT AT03704680T patent/ATE301727T1/de not_active IP Right Cessation
- 2003-02-22 EP EP03704680A patent/EP1490522B1/de not_active Expired - Lifetime
- 2003-02-22 US US10/509,299 patent/US20050166710A1/en not_active Abandoned
- 2003-03-25 EG EG2003030281A patent/EG23270A/xx active
- 2003-03-25 AR ARP030101038A patent/AR039135A1/es unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07216429A (ja) * | 1994-02-03 | 1995-08-15 | Nippon Steel Corp | 脱炭滓を用いたステンレス粗溶鋼の製造方法 |
JPH0885815A (ja) * | 1994-09-16 | 1996-04-02 | Nippon Steel Corp | 脱炭滓を用いた効率的な含クロム溶鋼の精錬方法 |
JPH0987720A (ja) * | 1995-09-29 | 1997-03-31 | Kawasaki Steel Corp | 含クロム溶鋼の脱炭精錬方法 |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 11 26 December 1995 (1995-12-26) * |
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 08 30 August 1996 (1996-08-30) * |
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 07 31 July 1997 (1997-07-31) * |
Also Published As
Publication number | Publication date |
---|---|
AU2003206950A1 (en) | 2003-10-13 |
CN1643168A (zh) | 2005-07-20 |
EP1490522B1 (de) | 2005-08-10 |
DE10213967A1 (de) | 2003-10-09 |
TW200304494A (en) | 2003-10-01 |
EG23270A (en) | 2004-10-31 |
DE50300965D1 (de) | 2005-09-15 |
ATE301727T1 (de) | 2005-08-15 |
US20050166710A1 (en) | 2005-08-04 |
RU2004131672A (ru) | 2005-05-10 |
EP1490522A1 (de) | 2004-12-29 |
AR039135A1 (es) | 2005-02-09 |
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