EP0028998A1 - Procédé de conditionnement de la scorie au cours de l'affinage d'un bain de métal - Google Patents
Procédé de conditionnement de la scorie au cours de l'affinage d'un bain de métal Download PDFInfo
- Publication number
- EP0028998A1 EP0028998A1 EP80630045A EP80630045A EP0028998A1 EP 0028998 A1 EP0028998 A1 EP 0028998A1 EP 80630045 A EP80630045 A EP 80630045A EP 80630045 A EP80630045 A EP 80630045A EP 0028998 A1 EP0028998 A1 EP 0028998A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slag
- flow rate
- bath
- bubbling
- bubbling gas
- 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.)
- Ceased
Links
- 239000002893 slag Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000007670 refining Methods 0.000 title claims abstract description 14
- 239000002184 metal Substances 0.000 title claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 12
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 8
- 230000005587 bubbling Effects 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 238000005261 decarburization Methods 0.000 claims abstract description 14
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 5
- 230000003247 decreasing effect Effects 0.000 claims abstract description 4
- 230000023556 desulfurization Effects 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000002485 combustion reaction Methods 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000003517 fume Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 230000001143 conditioned effect Effects 0.000 claims description 2
- 238000005187 foaming Methods 0.000 claims description 2
- 230000002706 hydrostatic effect Effects 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000005070 ripening Effects 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims 1
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 4
- 239000002002 slurry Substances 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010348 incorporation Methods 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
- 239000000463 material Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003923 scrap metal Substances 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 210000003462 vein Anatomy 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 process for conditioning the slag during the refining of a metal bath, in particular of liquid iron, by blowing oxygen from the top and by bubbling with inert gas through the bottom of the crucible .
- a technique for refining cast iron by blowing oxygen from above consists in creating, during the blowing above the bath, a frothy and highly oxidized slag.
- a high height of the lance 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.
- a refining process during which the interface between the metal and the slag is constantly. of inert gas so that the slag is permanently deoxidized and cannot consequently take on a frothy consistency does not, by itself, take account of the multiplicity of reactions which take place in the bath and especially in the slag.
- the slag must necessarily have an adjustable degree of reactivity as well as an essentially fluid consistency, also adjustable, to allow the refining to be carried out under conditions recognized as favorable. At the same time it is necessary to follow the momentary degree of decarburization of the bath as a function of the oxygen injected.
- the aim of the present invention was therefore to develop a process for conditioning the slag during the refining of a cast iron bath allowing the monitoring of the evolution of the thermochemical reactions taking place in the bath and in the slag, as well as the behavior of the slag from a local point of view.
- the process according to the invention which is characterized in that the consistency of the layer of slag which floats on the bath and / or the level of said slag layer is determined on the one hand as well that on the other hand the decarburization speed of the bath and that the flow rate of the bubbling gas is adjusted so as to ensure that on the one hand the level of the slag is at a determined distance from the lan ce head and that on the other hand the slag shows a fluid consistency.
- the consistency of the slag layer can be determined, for example, by measuring the intensity of the sound emitted by the blowing lance and an indication of the level of the slag layer can be obtained by measuring hydrostatic pressures prevailing at different levels of the crucible wall.
- the composition of the converter fumes can be determined continuously, preferably using a mass spectrometer.
- the oxygen blown between the metal and the slag is divided according to the invention by increasing, according to the measurement results, the flow rate of the bubbling gas for deoxidizing the slag and decreasing said flow to promote oxidation of the slag.
- the flow rate of the bubbling gas varies between 0 and 0.3 Nm 3 / t-minute.
- the process according to the invention provides that the lance is practically confined in a role of simple oxygen supplier and that the rate of decarburization of the metal by the flow of the bubbling gas.
- the decarburization speed is increased by increasing the flow rate of the bubbling gas and it is braked by decreasing said flow rate, as indicated by the measuring devices.
- the deoxidation of the slag which is carried out by means of an increase in the flow rate of the bubbling gas, is carried out in part by the accelerated combustion of the carbon which is transported using the bubbling gas to the slag more or less oxidized.
- the slag is conditioned according to the invention in the sense that the bubbling with inert gas is stopped, so that the slag rises, which is favorable with a view to scrubbing.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU81859A LU81859A1 (fr) | 1979-11-07 | 1979-11-07 | Procede de conditionnement de la scorie au cours de l'affinage d'un bain de metal |
| LU81859 | 1979-11-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0028998A1 true EP0028998A1 (fr) | 1981-05-20 |
Family
ID=19729283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80630045A Ceased EP0028998A1 (fr) | 1979-11-07 | 1980-10-16 | Procédé de conditionnement de la scorie au cours de l'affinage d'un bain de métal |
Country Status (13)
| Country | Link |
|---|---|
| US (2) | US4325730A (pt) |
| EP (1) | EP0028998A1 (pt) |
| JP (1) | JPS5690918A (pt) |
| AU (1) | AU531565B2 (pt) |
| BR (1) | BR8007220A (pt) |
| CA (1) | CA1159651A (pt) |
| ES (1) | ES496609A0 (pt) |
| IN (1) | IN154855B (pt) |
| LU (1) | LU81859A1 (pt) |
| PL (1) | PL227707A1 (pt) |
| PT (1) | PT71997B (pt) |
| RO (1) | RO81380B (pt) |
| ZA (1) | ZA806905B (pt) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0084288A1 (de) * | 1981-12-09 | 1983-07-27 | Arbed S.A. | Verfahren und Einrichtung zum direkten Herstellen von flüssigem Eisen |
| EP0086732A1 (de) * | 1982-02-17 | 1983-08-24 | Arbed S.A. | Verfahren zum Erhöhen der Kühlstoffsätze beim Herstellen von Stahl durch Sauerstoffaufblasen |
| EP0107609A1 (de) * | 1982-09-27 | 1984-05-02 | Arbed S.A. | Verfahren und Einrichtung zum Beheizen eines mit Schrott beschickten Stahlbades |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5893809A (ja) * | 1981-11-30 | 1983-06-03 | Daido Steel Co Ltd | 溶鋼の精錬方法 |
| NL8201269A (nl) * | 1982-03-26 | 1983-10-17 | Hoogovens Groep Bv | Werkwijze voor het vervaardigen van staal in een converter uitgaande van ruwijzer en schrot. |
| ZA835649B (en) * | 1982-08-25 | 1984-04-25 | British Steel Corp | Lancing in electric arc steelmaking |
| US4529442A (en) * | 1984-04-26 | 1985-07-16 | Allegheny Ludlum Steel Corporation | Method for producing steel in a top oxygen blown vessel |
| AU558925B2 (en) * | 1984-04-27 | 1987-02-12 | Nippon Steel Corporation | Monitoring and controlling the slag-forming conditions in the basic oxygen steel converter |
| JPS60230929A (ja) * | 1984-04-27 | 1985-11-16 | Nippon Steel Corp | 転炉操業方法 |
| SE8800321D0 (sv) * | 1987-08-20 | 1988-02-02 | Scandinavian Emission Tech | Metallurgisk styrmetod |
| AT392801B (de) * | 1989-06-05 | 1991-06-25 | Voest Alpine Ind Anlagen | Verfahren zur schlackenfuehrung in einem blasstahlkonverter |
| US5584909A (en) * | 1995-01-19 | 1996-12-17 | Ltv Steel Company, Inc. | Controlled foamy slag process |
| EP0827554B1 (en) | 1996-03-22 | 2002-11-13 | Steel Technology Corporation | Stable operation of a smelter reactor |
| US5885322A (en) * | 1996-03-22 | 1999-03-23 | Steel Technology Corporation | Method for reducing iron losses in an iron smelting process |
| US6309442B1 (en) | 2000-02-25 | 2001-10-30 | John D. Usher | Refractory material sensor for determining level of molten metal and slag and method of using |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU69388A1 (pt) * | 1973-02-15 | 1974-05-29 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US3719469A (en) * | 1970-07-22 | 1973-03-06 | Allegheny Ludlum Ind Inc | Control for basic oxygen steelmaking furnace |
| JPS5129692B2 (pt) * | 1972-06-24 | 1976-08-27 | ||
| JPS5335764B2 (pt) * | 1972-10-06 | 1978-09-28 | ||
| US4047937A (en) * | 1972-12-04 | 1977-09-13 | United States Steel Corporation | Method for controlling the operation of a steel refining converter |
| US4197116A (en) * | 1973-03-30 | 1980-04-08 | United States Steel Corporation | Method and apparatus for automatically controlling the rate of flux injection to a converter |
| US3854932A (en) * | 1973-06-18 | 1974-12-17 | Allegheny Ludlum Ind Inc | Process for production of stainless steel |
| US4195985A (en) * | 1977-12-10 | 1980-04-01 | Eisenwerk-Gesellschaft Maximilianshutte Mbh. | Method of improvement of the heat-balance in the refining of steel |
-
1979
- 1979-11-07 LU LU81859A patent/LU81859A1/fr unknown
-
1980
- 1980-10-16 EP EP80630045A patent/EP0028998A1/fr not_active Ceased
- 1980-10-30 PT PT71997A patent/PT71997B/pt unknown
- 1980-11-05 JP JP15477380A patent/JPS5690918A/ja active Pending
- 1980-11-06 ES ES496609A patent/ES496609A0/es active Granted
- 1980-11-06 AU AU64124/80A patent/AU531565B2/en not_active Ceased
- 1980-11-06 BR BR8007220A patent/BR8007220A/pt not_active IP Right Cessation
- 1980-11-06 PL PL22770780A patent/PL227707A1/xx unknown
- 1980-11-06 US US06/204,537 patent/US4325730A/en not_active Expired - Lifetime
- 1980-11-06 IN IN798/DEL/80A patent/IN154855B/en unknown
- 1980-11-07 ZA ZA00806905A patent/ZA806905B/xx unknown
- 1980-11-07 RO RO102526A patent/RO81380B/ro unknown
- 1980-11-07 CA CA000364220A patent/CA1159651A/fr not_active Expired
-
1981
- 1981-05-04 US US06/261,509 patent/US4345746A/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU69388A1 (pt) * | 1973-02-15 | 1974-05-29 |
Non-Patent Citations (1)
| Title |
|---|
| REVUE DE METALLURGIE, Vol. 75, No. 6, 1978, pages 415-426 G. DENIER, H. GAYE: "Nouvelles perspectives de l'affinage LD-etudes physico-chimiques et tests a l'echelle pilote" * Page 417 * * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0084288A1 (de) * | 1981-12-09 | 1983-07-27 | Arbed S.A. | Verfahren und Einrichtung zum direkten Herstellen von flüssigem Eisen |
| EP0086732A1 (de) * | 1982-02-17 | 1983-08-24 | Arbed S.A. | Verfahren zum Erhöhen der Kühlstoffsätze beim Herstellen von Stahl durch Sauerstoffaufblasen |
| EP0107609A1 (de) * | 1982-09-27 | 1984-05-02 | Arbed S.A. | Verfahren und Einrichtung zum Beheizen eines mit Schrott beschickten Stahlbades |
Also Published As
| Publication number | Publication date |
|---|---|
| AU531565B2 (en) | 1983-08-25 |
| BR8007220A (pt) | 1981-05-12 |
| CA1159651A (fr) | 1984-01-03 |
| RO81380A (ro) | 1983-04-29 |
| US4325730A (en) | 1982-04-20 |
| ZA806905B (en) | 1981-10-28 |
| PT71997A (fr) | 1980-11-01 |
| AU6412480A (en) | 1981-05-14 |
| PL227707A1 (pt) | 1981-08-21 |
| RO81380B (ro) | 1983-04-30 |
| LU81859A1 (fr) | 1981-06-04 |
| ES8107316A1 (es) | 1981-10-01 |
| ES496609A0 (es) | 1981-10-01 |
| PT71997B (fr) | 1981-08-31 |
| US4345746A (en) | 1982-08-24 |
| IN154855B (pt) | 1984-12-15 |
| JPS5690918A (en) | 1981-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): AT BE DE FR GB IT NL SE |
|
| 17P | Request for examination filed |
Effective date: 19811007 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
| 18R | Application refused |
Effective date: 19841126 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HENRION, ROMAIN Inventor name: BAUMERT, JEAN Inventor name: LORANG, LUCIEN Inventor name: SCHLEIMER, FRANCOIS Inventor name: GOEDERT, FERDINAND |