EP0034108B1 - Verfahren zum Raffinieren einer Metallschmelze - Google Patents
Verfahren zum Raffinieren einer Metallschmelze Download PDFInfo
- Publication number
- EP0034108B1 EP0034108B1 EP81630003A EP81630003A EP0034108B1 EP 0034108 B1 EP0034108 B1 EP 0034108B1 EP 81630003 A EP81630003 A EP 81630003A EP 81630003 A EP81630003 A EP 81630003A EP 0034108 B1 EP0034108 B1 EP 0034108B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bath
- oxygen
- refining
- height
- melt
- 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.)
- Expired
Links
- 238000007670 refining Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 title claims description 7
- 239000002184 metal Substances 0.000 title claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 41
- 239000001301 oxygen Substances 0.000 claims abstract description 41
- 239000002893 slag Substances 0.000 claims abstract description 27
- 238000007664 blowing Methods 0.000 claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims abstract description 15
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 9
- PNHVXXUMHKJRKJ-RPSULYRYSA-N [(Z)-[(2Z,3E)-2,3-bis(hydroxyimino)-5,5-dimethylcyclohexylidene]amino]thiourea Chemical group CC1(C)C\C(=N/O)\C(=N/O)\C(\C1)=N/NC(N)=S PNHVXXUMHKJRKJ-RPSULYRYSA-N 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims 3
- 238000005261 decarburization Methods 0.000 abstract description 9
- 239000011261 inert gas Substances 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 239000000155 melt Substances 0.000 abstract 7
- 239000000161 steel melt Substances 0.000 abstract 2
- 230000005587 bubbling Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000005070 ripening Effects 0.000 description 2
- 239000003923 scrap metal Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000011593 sulfur 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
Definitions
- the present invention relates to a method for refining a metal bath, in particular by controlling the supply of oxygen from above and bubbling with inert gas from the bottom of the crucible.
- a high height of the spray head results in a preferential oxidation of the slag which takes on a frothy consistency, which promotes dephosphorization and desulfurization.
- a low height of the lance head leads to an accelerated decarburization and to an increased release of heat, especially at the point of impact of the oxygen jet, which heat can be used for the fusion of solid materials incorporated in the bath.
- the slag must necessarily have an adjustable degree of reactivity as well as an essentially fluid consistency, also adjustable, to allow the conduct of the refining under conditions recognized as favorable, both from the point of view of the post-combustion of the CO than from the point of view of dephosphorization and desulfurization of the bath. Along with this, it is necessary to monitor the momentary degree of decarburization of the bath as a function of the oxygen injected.
- a blowing lance which has a main oxygen circuit and a secondary oxygen circuit, to clearly differentiate the oxygen jet intended to enter the bath from the added secondary oxygen. to support the post-combustion of CO above the bath level.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Coating With Molten Metal (AREA)
- Electrotherapy Devices (AREA)
- General Induction Heating (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Steel (AREA)
Claims (4)
1. Verfahren zum Frischen eines Stahlbades durch Oxygen-Aufblasen mittels einer Blaslanze welche sowohl einen Primär- als auch einen Sekundär- Sauerstoffkreis besitzt, wobei letzterer die notwendige Menge Sauerstoff zum Verbrennen der während des Frischens entweichenden CO-Menge liefert, welche durch Einblasen von im wesentlichen inertem Spülgas durch den Gefässboden unterstützt wird, dadurch gekennzeichnet, dass man kontinuierlich die auf dem Bad schwimmende Schlackendicke, die Entkohlungs-Geschwindikeit des Bades, sowie den Nachverbrennungs-Faktor des Kohlenstoffmonoxyds bestimmt und, dass man die Höhe der Blaslanze über dem Bad, den Gesamtdurchsatz an geblasenem Sauerstoff, den Durchsatz an Sekundär-Sauerstoff un den Durchsatz an Spülgas derart regelt, dass zu jedem Zeitpunkt des Frischens folgender Gleichung genügt wird : 
wo
und wo der Durchmesser des Tiegels 500 cm und die Badhöhe 120 cm beträgt.
HSC die Schlackendicke zu einem bestimmten Zeitpunkt t,
HL die Blasianzenhöhe,
DOT den gesamten Sauerstoffdurchsatz,
DOS den Sekundär-Sauerstoffdurchsatz,
DCDT die Entkohlungsgeschwindigkeit des Bades,
X den Nachverbrennungsfaktor (% CO2)1(% CO + % CO2) des entweichenden CO und
F den Durchsatz an Spulgas darstellt,
und wo der Durchmesser des Tiegels 500 cm und die Badhöhe 120 cm beträgt.
2. Verfahren gemäss Anspruch 1, dadurch gekennzeichnet, dass man das Frischen derart steuert, dass man sicherstellt, dass sich das Verhältnis (Schlackendicke/Badhöhe) zwischen einer oberen und unteren Grenze, welche empirisch für eine gegebene Anlage bestimmt wird, bewegt.
3. Verfahren gemäss den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass man die Entphosphorung und die Entschwefelung des Bades durch Einstellen der Frischbedingungen begünstigt und zwar derart, dass man das Verhältnis (Schlackendicke/Badhöhe) zur oberen Grenze hin neigen lässt.
4. Verfahren gemäss den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass man die Nachverbrennung von CO durch Einstellen der Frischbedingungen bedingungen begünstigt und zwar derart, dass man das Verhältnis (Schlackendicke/Badhöhe) zur unteren Grenze hin neigen lässt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT81630003T ATE14320T1 (de) | 1980-01-09 | 1981-01-07 | Verfahren zum raffinieren einer metallschmelze. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU82070A LU82070A1 (fr) | 1980-01-09 | 1980-01-09 | Procede d'affinage d'un bain de metal |
| LU82070 | 1980-01-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0034108A1 EP0034108A1 (de) | 1981-08-19 |
| EP0034108B1 true EP0034108B1 (de) | 1985-07-17 |
Family
ID=19729325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81630003A Expired EP0034108B1 (de) | 1980-01-09 | 1981-01-07 | Verfahren zum Raffinieren einer Metallschmelze |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US4334922A (de) |
| EP (1) | EP0034108B1 (de) |
| JP (1) | JPS56102509A (de) |
| AT (1) | ATE14320T1 (de) |
| AU (1) | AU536836B2 (de) |
| BR (1) | BR8100121A (de) |
| CA (1) | CA1157659A (de) |
| CS (1) | CS249112B2 (de) |
| DE (1) | DE3171356D1 (de) |
| ES (1) | ES8203103A1 (de) |
| LU (1) | LU82070A1 (de) |
| PL (1) | PL229120A1 (de) |
| PT (1) | PT72323B (de) |
| RO (1) | RO81435A (de) |
| ZA (1) | ZA808091B (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4529442A (en) * | 1984-04-26 | 1985-07-16 | Allegheny Ludlum Steel Corporation | Method for producing steel in a top oxygen blown vessel |
| US5885322A (en) * | 1996-03-22 | 1999-03-23 | Steel Technology Corporation | Method for reducing iron losses in an iron smelting process |
| CN115044729B (zh) * | 2022-06-28 | 2023-11-03 | 日照钢铁控股集团有限公司 | 一种高废钢比条件下转炉低热值煤气高效回收方法 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU69358A1 (de) * | 1973-02-16 | 1974-05-17 | ||
| LU69388A1 (de) * | 1973-02-15 | 1974-05-29 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1363687A (fr) * | 1963-07-17 | 1964-06-12 | Bot Brassert Oxygen Technik Ag | Procédé et dispositif de réglage de fonctionnement pour opérations de soufflage ou pour des méthodes analogues d'affinage métallurgique |
| US3871871A (en) * | 1967-12-11 | 1975-03-18 | Centre Nat Rech Metall | Monitoring and control of pig iron refining |
| AT297073B (de) * | 1969-04-15 | 1972-03-10 | Voest Ag | Verfahren zur Messung der Dicke der Schlackenschicht auf metallischen Bädern, insbesondere auf durch Vakuumbehandlung zu entgasenden Schmelzen |
| BE755456A (fr) * | 1969-08-29 | 1971-03-01 | Allegheny Ludlum Ind Inc | Decarburation de l'acier fondu |
-
1980
- 1980-01-09 LU LU82070A patent/LU82070A1/fr unknown
- 1980-12-25 RO RO80102954A patent/RO81435A/ro unknown
- 1980-12-29 ZA ZA00808091A patent/ZA808091B/xx unknown
- 1980-12-30 AU AU65893/80A patent/AU536836B2/en not_active Ceased
-
1981
- 1981-01-05 US US06/222,716 patent/US4334922A/en not_active Expired - Fee Related
- 1981-01-06 CA CA000367940A patent/CA1157659A/fr not_active Expired
- 1981-01-07 DE DE8181630003T patent/DE3171356D1/de not_active Expired
- 1981-01-07 EP EP81630003A patent/EP0034108B1/de not_active Expired
- 1981-01-07 AT AT81630003T patent/ATE14320T1/de not_active IP Right Cessation
- 1981-01-08 PT PT72323A patent/PT72323B/pt unknown
- 1981-01-08 ES ES498381A patent/ES8203103A1/es not_active Expired
- 1981-01-08 PL PL22912081A patent/PL229120A1/xx unknown
- 1981-01-09 CS CS81205A patent/CS249112B2/cs unknown
- 1981-01-09 JP JP128981A patent/JPS56102509A/ja active Pending
- 1981-01-09 BR BR8100121A patent/BR8100121A/pt not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU69388A1 (de) * | 1973-02-15 | 1974-05-29 | ||
| LU69358A1 (de) * | 1973-02-16 | 1974-05-17 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56102509A (en) | 1981-08-17 |
| US4334922A (en) | 1982-06-15 |
| CS249112B2 (en) | 1987-03-12 |
| LU82070A1 (fr) | 1981-09-10 |
| DE3171356D1 (en) | 1985-08-22 |
| RO81435A (ro) | 1983-06-01 |
| PT72323A (fr) | 1981-02-01 |
| PT72323B (fr) | 1981-12-18 |
| ATE14320T1 (de) | 1985-08-15 |
| ES498381A0 (es) | 1982-03-01 |
| BR8100121A (pt) | 1981-07-28 |
| EP0034108A1 (de) | 1981-08-19 |
| AU536836B2 (en) | 1984-05-24 |
| AU6589380A (en) | 1981-07-16 |
| PL229120A1 (de) | 1981-09-04 |
| CA1157659A (fr) | 1983-11-29 |
| ES8203103A1 (es) | 1982-03-01 |
| ZA808091B (en) | 1982-01-27 |
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