EP2986743B1 - Procédé pour la production de ferro-alliages présentant une teneur réduite en carbone dans un convertisseur à vide - Google Patents
Procédé pour la production de ferro-alliages présentant une teneur réduite en carbone dans un convertisseur à vide Download PDFInfo
- Publication number
- EP2986743B1 EP2986743B1 EP14724289.5A EP14724289A EP2986743B1 EP 2986743 B1 EP2986743 B1 EP 2986743B1 EP 14724289 A EP14724289 A EP 14724289A EP 2986743 B1 EP2986743 B1 EP 2986743B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- converter
- injected
- vacuum
- alloys
- oxygen
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 9
- 229910052799 carbon Inorganic materials 0.000 title claims description 9
- 229910001021 Ferroalloy Inorganic materials 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 16
- 239000011261 inert gas Substances 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910015136 FeMn Inorganic materials 0.000 claims description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 238000005261 decarburization Methods 0.000 description 12
- 239000002893 slag Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000010744 Boudouard reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000013206 minimal dilution Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000161 steel melt Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- 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
- C21C7/10—Handling in a vacuum
Definitions
- the invention relates to a process for the preparation of ferroalloys, in particular FeCr and FeMn alloys, with low carbon content in the AOD converter,
- Fe Cr Fe Mn AOD converter 1.0% 1.0% CLU converter 1.0% 1.0% VOD / VODC converter 0.4% 0.4%
- Dividing the refining to the lowest C-content in the production of ferroalloys in two process stages with converter and vacuum system significantly reduces the cycle time of the individual plant components and enables lower carbon contents to be achieved ,
- This division of the process steps shortens the treatment time in the individual treatment stages and thus increases the production of the entire system.
- the VODC converter (V acuum O xygen D ecarburisation C onverter) connects these two process steps already in one unit.
- the process is known from steelmaking, especially for the production of stainless steel and special steels. Vacuum converters have already been built by GHH, Leybold Heraeus, Daido and Demag.
- a VODC converter oxygen is injected via a top lance into a converter vessel with soil washes (Ar or N 2 ) under vacuum in a steel melt for refining.
- soil washes Ar or N 2
- the technologies and plant components used have been significantly improved over time (vacuum pumps, vacuum lance insert, vacuum bunker, exhaust gas analysis, etc.).
- the downside of this process is that the decarburization process, as in the VOD plant, only proceeds very slowly over an O 2 top lance with very low blow rates with low intermixing energy throughout the process.
- the invention has for its object to simplify the manufacturing process.
- the first stage involves the desilication and the main decarburization of the melt and is carried out on the basis of the AOD process under atmospheric conditions.
- oxygen is injected into the melt via a top lance and oxygen and CO 2 via the underbath nozzles.
- the process in the converter vessel is run under vacuum.
- a vacuum cap is run over the converter mouth and with the help of side nozzles under vacuum.
- the partial pressure reduction of CO takes place to one via the injection of inert gas and in parallel via a pressure reduction in the vessel.
- the gases CO 2 or C m H 2m + 2 in turn, cause an endothermic reaction and, in the application of CO 2, the Boudouard reaction (the carbon content of the melt is in this phase still well over 1%) use.
- Boudouard equilibrium is the temperature-dependent chemical equilibrium between carbon, carbon monoxide and carbon dioxide.
- Oxygen can be mixed with CO 2 on the process and protective gas sides of the annular gap nozzle.
- the use of these gases also has the consequence in this process phase that the coolant requirement can be reduced.
- the slag is reduced with the aid of conventional reducing agents and slag formers.
- the new process also uses CO 2 .
- the CO 2 will react in the melt with the carbon (Boudouard reaction) to CO.
- Boudouard reaction to CO.
- CO supports the reduction of the slag, which leads to lowest chromium oxide / manganese oxide contents in the slag and thus to higher outputs of the respective reduced metals.
- Inert gas in the form of Ar or N 2 can also be used as purge gas.
- the reduction of slag can take place both under vacuum and under atmospheric conditions.
- the vacuum converter is equipped with a valve station that allows mixing of the process and inert gases used for the top lance and bottom bath nozzles.
- the gases are mixed as follows, especially in the case of the underbath nozzles on the process and inert gas sides tuyeres tuyeres lance mixing ratio protective gas process gas O 2 X X N 2 X X Ar X X CO 2 X X X C m H 2m + 2 X O 2 + N 2 / air X X X 1: 4-4: 1 O 2 + Ar X 1: 4-4: 1 O 2 + CO 2 X X 1: 4-4: 1
- the conditions for refining under vacuum in the AOD converter with simultaneous injection of large amounts of inert gas to lower the partial pressure of CO are significantly cheaper than in a VOD / VODC plant, because the reaction space, the specific blowing rates and the mixing energy of the reaction potential for decarburization in the Enlarge converter vessel significantly. For this reason, the decarburization rate in the vacuum converter is significantly greater than in a VOD or VODC system.
- the refractory consumption of a conventional VOD / VODC system is significantly longer due to longer treatment times than with a vacuum converter.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Claims (1)
- Procédé pour la fabrication de ferro-alliages, en particulier d'alliages FeCr et FeMn possédant une faible teneur en carbone dans un convertisseur à vide, caractérisé en ce que, dans le convertisseur à vide, au cours de la première étape, on effectue la désiliciation et la décarburation principale de la masse fondue sur base du procédé de conversion dans des conditions atmosphériques, dans lequel on introduit par soufflage, dans la masse fondue, via une lance supérieure, de l'oxygène et, via des buses immergées, en particulier des buses à fente annulaire, de l'oxygène et du CO2, et en ce que, directement après, dans le même convertisseur, au cours d'une deuxième étape, on procède à la décarburation en profondeur sous vide, dans lequel on injecte, du côté du gaz de protection des buses immergées, en outre du CO2 ou du CmH2m+2; dans lequel, au cours de la première étape, du côté du gaz de protection des buses à fente annulaire, on injecte du CO2, du CmH2m+2 du Ar ou du N2, en plus du gaz inerte, et on injecte, du côté du gaz de traitement des buses à fente annulaire, de l'oxygène avec un gaz inerte tel que du CO2, de l'argon ou de l'azote.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013006986 | 2013-04-15 | ||
| DE201310014856 DE102013014856A1 (de) | 2013-04-15 | 2013-09-02 | Verfahren und Anlage zur Herstellung von Ferrolegierungen mit niedrigem Kohlenstoffgehalt in einem Vakuum-Konverter |
| PCT/DE2014/000164 WO2014169888A1 (fr) | 2013-04-15 | 2014-03-25 | Procédé et installation pour la production de ferro-alliages présentant une teneur réduite en carbone dans un convertisseur à vide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2986743A1 EP2986743A1 (fr) | 2016-02-24 |
| EP2986743B1 true EP2986743B1 (fr) | 2017-02-01 |
Family
ID=51618168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14724289.5A Active EP2986743B1 (fr) | 2013-04-15 | 2014-03-25 | Procédé pour la production de ferro-alliages présentant une teneur réduite en carbone dans un convertisseur à vide |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2986743B1 (fr) |
| DE (1) | DE102013014856A1 (fr) |
| WO (1) | WO2014169888A1 (fr) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021214220A1 (de) | 2021-03-08 | 2022-09-08 | Sms Group Gmbh | Verfahren zum Herstellen einer Ferrolegierung mit niedrigem Kohlenstoffgehalt |
| DE102021214218A1 (de) | 2021-03-08 | 2022-09-08 | Sms Group Gmbh | Verfahren zum Herstellen einer Ferrolegierung mit niedrigem Kohlenstoffgehalt |
| EP4056720A1 (fr) | 2021-03-08 | 2022-09-14 | SMS Group GmbH | Procédé de fabrication d'un ferro-alliage à faible taux de carbone |
| EP4056721A1 (fr) | 2021-03-08 | 2022-09-14 | SMS Group GmbH | Procédé de fabrication d'un ferro-alliage à faible taux de carbone |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424136A (zh) * | 2019-01-10 | 2020-07-17 | 宝山钢铁股份有限公司 | 一种rh柔性自补偿密封通道及其柔性补偿方法 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2123212A1 (en) * | 1971-01-29 | 1972-09-08 | Creusot Loire | Refinement and alloying of steel - in one furnace as one sequence of operations esp for stainless steel |
| DE4401244C2 (de) * | 1994-01-18 | 2002-11-07 | Ald Vacuum Techn Ag | Verfahren zur Entkohlung von Stahlschmelzen |
| JP3531218B2 (ja) * | 1994-06-20 | 2004-05-24 | 大同特殊鋼株式会社 | 低炭素含クロム鋼の製造方法 |
| BRPI0216050B1 (pt) * | 2001-09-20 | 2015-12-29 | Nippon Steel & Sumitomo Metal Corp | aparelho de refino para aços ao cromo fundidos |
-
2013
- 2013-09-02 DE DE201310014856 patent/DE102013014856A1/de not_active Withdrawn
-
2014
- 2014-03-25 EP EP14724289.5A patent/EP2986743B1/fr active Active
- 2014-03-25 WO PCT/DE2014/000164 patent/WO2014169888A1/fr active Application Filing
Non-Patent Citations (1)
| Title |
|---|
| None * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021214220A1 (de) | 2021-03-08 | 2022-09-08 | Sms Group Gmbh | Verfahren zum Herstellen einer Ferrolegierung mit niedrigem Kohlenstoffgehalt |
| DE102021214218A1 (de) | 2021-03-08 | 2022-09-08 | Sms Group Gmbh | Verfahren zum Herstellen einer Ferrolegierung mit niedrigem Kohlenstoffgehalt |
| EP4056720A1 (fr) | 2021-03-08 | 2022-09-14 | SMS Group GmbH | Procédé de fabrication d'un ferro-alliage à faible taux de carbone |
| EP4056721A1 (fr) | 2021-03-08 | 2022-09-14 | SMS Group GmbH | Procédé de fabrication d'un ferro-alliage à faible taux de carbone |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2986743A1 (fr) | 2016-02-24 |
| WO2014169888A1 (fr) | 2014-10-23 |
| DE102013014856A1 (de) | 2014-10-16 |
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