LU85605A1 - Metallurgical vessel lining protection - in gas blowing zone(s) to prevent carbon burn-off - Google Patents
Metallurgical vessel lining protection - in gas blowing zone(s) to prevent carbon burn-off Download PDFInfo
- Publication number
- LU85605A1 LU85605A1 LU85605A LU85605A LU85605A1 LU 85605 A1 LU85605 A1 LU 85605A1 LU 85605 A LU85605 A LU 85605A LU 85605 A LU85605 A LU 85605A LU 85605 A1 LU85605 A1 LU 85605A1
- Authority
- LU
- Luxembourg
- Prior art keywords
- zone
- injected
- oxidizing agent
- gas
- gas introduction
- Prior art date
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 13
- 238000007664 blowing Methods 0.000 title abstract description 9
- 239000007789 gas Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000007800 oxidant agent Substances 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052786 argon Inorganic materials 0.000 claims abstract description 4
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 238000003756 stirring Methods 0.000 abstract description 4
- 238000007670 refining Methods 0.000 abstract description 3
- 239000011449 brick Substances 0.000 abstract description 2
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- 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
- C21C7/072—Treatment with gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings ; Increasing the durability of linings; Breaking away linings
- F27D1/1678—Increasing the durability of linings; Means for protecting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/161—Introducing a fluid jet or current into the charge through a porous element
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
* ? «, ».*? ",".
Ί Λ C 2268/8310.Ί Λ C 2268/8310.
CENTRE DE RECHERCHES METALLURGIQUES -CENTRUM V00R RESEARCH IN DE METALLURGIE,METALLURGICAL RESEARCH CENTER -CENTRUM V00R RESEARCH IN DE METALLURGIE,
Association sans but lucratif -Vereniging zonder winstoogmerk à BRUXELLES, (Belgique).Non-profit association -Vereniging zonder winstoogmerk in BRUXELLES, (Belgium).
Procédé de protection du garnissage réfractaire d'un récipient métallurgique.Method of protecting the refractory lining of a metallurgical container.
La présente invention concerne un procédé de protection du garnissage réfractaire d'un récipient métallurgique, au voisinage d'éléments d'introduction de gaz sous la surface d'un-bain mé-tallique contenu dans ce récipient.The present invention relates to a method of protecting the refractory lining of a metallurgical container, in the vicinity of elements for introducing gas under the surface of a metal bath contained in this container.
Au sens de la présente invention, les éléments d'introduction de gaz comprennent notamment les tuyères de soufflage d'un gaz, - soit d’affinage tel que l'oxygène, soit de brassage tel que 1' argon, et les pièces dites "poreuses'' servant à l'introduction de gaz de brassage. Le procédé de l'invention s'applique dès lors aux divers types de récipients métallurgiques, en particulier aux convertisseurs d'aciérie pouvant comporter au moins un tel élément d'introduction de gaz.Within the meaning of the present invention, the gas introduction elements include in particular the gas blowing nozzles, - either refining such as oxygen, or stirring such as argon, and the so-called "parts porous "for the introduction of mixing gas. The process of the invention therefore applies to various types of metallurgical vessels, in particular to steelworks converters which may include at least one such gas introduction element .
9 29 2
Pour fixer les idées, la description gui suit , se réfère, à titre purement exemplatif, à un convertisseur à soufflage d'oxygène par le fond. On sait que, dans ce type de convertisseur, les tuyères de soufflage sont logées dans le garnissage réfractaire du fond et sont en principe protégées contre une destruction rapide par un jet d'un agent approprié entourant le jet d'oxygène.To fix the ideas, the description which follows, refers, purely by way of example, to a converter with oxygen blowing from the bottom. It is known that, in this type of converter, the blowing nozzles are housed in the refractory lining of the bottom and are in principle protected against rapid destruction by a jet of an appropriate agent surrounding the jet of oxygen.
On sait par ailleurs que le garnissage réfractaire situé autour de ces tuyères contient généralement une certaine quantité de carbone. Celui-ci est ajouté au matériau réfractaire afin d'améliorer sa résistance au choc thermique et à l'érosion par les oxydes présents dans le bain métallique. Ces deux propriétés sont particulièrement intéressantes pour le réfractaire situé au voisinage des éléments d'introduction de gaz, car elles ac-a croissent la durée de vie du garnissage et dès lors également celle des tuyères.We also know that the refractory lining located around these nozzles generally contains a certain amount of carbon. This is added to the refractory material in order to improve its resistance to thermal shock and to erosion by the oxides present in the metal bath. These two properties are particularly advantageous for the refractory located in the vicinity of the gas introduction elements, because they ac-a increase the lifetime of the lining and therefore also that of the nozzles.
On a cependant constaté que ce carbone, qui se présente souvent sous la forme de graphite, manifestait une tendance très marquée à s'oxyder en présence de matières oxydantes chaudes. Ce phénomène apparaît non seulement au cours de l'opération d'affinage ou de brassage du métal, mais également lorsque le convertisseur ne contient pas de métal en fusion, par exemple entre deux coulées. Dans le premier cas, il résulte de la réaction du graphite avec les oxydes présents dans le bain métallique; dans le second cas, il traduit la réaction du graphite avec l'air ambiant chaud ou avec de l'air de balayage introduit·. dans le convertisseur.However, it has been found that this carbon, which is often in the form of graphite, exhibits a very marked tendency to oxidize in the presence of hot oxidizing materials. This phenomenon appears not only during the refining or stirring operation of the metal, but also when the converter does not contain molten metal, for example between two castings. In the first case, it results from the reaction of graphite with the oxides present in the metal bath; in the second case, it reflects the reaction of graphite with warm ambient air or with purge air introduced. in the converter.
La disparition du graphite fait perdre au réfractaire ses propriétés évoquées plus haut et réduit par conséquent la durée de vie des tuyères de soufflage.The disappearance of the graphite causes the refractory to lose its properties mentioned above and consequently reduces the life of the blowing nozzles.
w 3.-w 3.-
La présente invention a pour objet un procédé permettant de remédier à cet inconvénient en empêchant, par un moyen simple, tout contact entre le carbone et . les gaz ou composés oxydants chauds en question.The present invention relates to a method making it possible to remedy this drawback by preventing, by a simple means, any contact between the carbon and. the hot oxidizing gases or compounds in question.
A cet effet, le procédé qui fait l'objet de la présente invention est essentiellement caractérisé en ce que l'on délimite une zone du dit garnissage comprenant au moins un élément d'introduction de gaz, et en ce que l'on injecte un agent non oxydant dans la dite zone.To this end, the process which is the subject of the present invention is essentially characterized in that one delimits an area of said lining comprising at least one gas introduction element, and in that one injects a non-oxidizing agent in said area.
Selon l'invention, on délimite la dite zone au moyen d'une paroi étanche au dit agent non oxydant.According to the invention, said zone is delimited by means of a wall which is sealed against said non-oxidizing agent.
Selon une mise en oeuvre particulièrement intéressante, on injecte le dit agent non oxydant de .façon permanente, avec un débit éventuellement variable, dans la dite zone.According to a particularly advantageous implementation, said non-oxidizing agent is injected in a permanent manner, with a possibly variable flow rate, into said zone.
Selon une première modalité de mise en oeuvre du procédé de 1’ invention, on injecte dans la dite zone un hydrocarbure liquide au moyen duquel on imprègne le matériau réfractaire entourant le dit élément d'introduction de gaz.According to a first method of implementing the method of the invention, a liquid hydrocarbon is injected into said zone by means of which the refractory material surrounding the said gas introduction element is impregnated.
Cette modalité s'est révélée particulièrement intéressante, car l'hydrocarbure liquide peut subir, dans les régions chaudes de la dite zone, un certain craquage avec dépôt de carbone; il est ainsi possible de remplacer, au moins partiellement, le carbone initialement présent dans la zone et qui aurait éventuellement * été oxydé.This method has proved to be particularly interesting, because the liquid hydrocarbon can undergo, in the hot regions of said zone, a certain cracking with carbon deposition; it is thus possible to replace, at least partially, the carbon initially present in the zone and which would have possibly * been oxidized.
Selon une autre modalité de mise en oeuvre, on peut également utiliser un agent réducteur gazeux, susceptible de réagir avec les composés et/ou les gaz oxydants chauds et d'empêcher la combustion du carbone présent dans le réfractaire.According to another embodiment, it is also possible to use a gaseous reducing agent, capable of reacting with the compounds and / or the hot oxidizing gases and of preventing the combustion of the carbon present in the refractory.
m 4.-m 4.-
On peut encore, selon l'invention, empêcher tout contact du carbone avec les matières oxydantes chaudes en insufflant dans la dite zone un gaz neutre, par exemple de l'azote ou de l'argon.It is also possible, according to the invention, to prevent any contact of the carbon with the hot oxidizing materials by blowing into the said zone a neutral gas, for example nitrogen or argon.
Selon un mode de réalisation préférentiel du procédé de l'invention, on délimite une zone comportant un ou plusieurs éléments d'introduction de gaz au moyen d'une enveloppe métallique étanche, excepté sur la face venant en contact avec le métal en fusion et dans laquelle débouchent le ou les éléments en question.According to a preferred embodiment of the method of the invention, an area comprising one or more gas introduction elements is delimited by means of a sealed metallic envelope, except on the face coming into contact with the molten metal and in which lead to the element or elements in question.
»"
On injecte l'agent non oxydant par la face arrière de la dite zone, c'est-à-dire celle qui correspond à l'extrémité d'entrée du ou des éléments; la partie de l'enveloppe métallique correspondant à cette face arrière est pourvue d'orifices permettant d'une part, le passage du ou des éléments et d'autre part, l'in-* jection du dit agent non oxydant.The non-oxidizing agent is injected through the rear face of said zone, that is to say that which corresponds to the inlet end of the element or elements; the part of the metal envelope corresponding to this rear face is provided with orifices allowing on the one hand, the passage of the element or elements and on the other hand, the * injection of said non-oxidizing agent.
Selon l'invention, on règle la pression d'injection du dit agent oxydant, de telle façon que sa pression à la sortie par la face opposée, dite face avant de la dite zone, soit au moins égale à celle des matières présentes dans le récipient.According to the invention, the injection pressure of said oxidizing agent is adjusted, so that its pressure at the outlet from the opposite face, called the front face of said zone, is at least equal to that of the materials present in the container.
Il convient de souligner que le procédé de l'invention peut également s'appliquer à des récipients dont le garnissage initialement ne contient pas de carbone, ce qui est généralement le cas des poches de coulée. Il s'est en effet avéré intéressant d'introduire un hydrocarbure liquide, conformément au présent procédé, dans une zone entourant une brique poreuse servant à l’insufflation d'un gaz de brassage. Le carbone déposé par craquage de l'hydrocarbure a permis d'augmenter localement la résistance du réfractaire au choc thermique notamment.It should be emphasized that the method of the invention can also be applied to containers whose lining initially does not contain carbon, which is generally the case with ladles. It has indeed proved to be advantageous to introduce a liquid hydrocarbon, in accordance with the present process, into an area surrounding a porous brick used for blowing a stirring gas. The carbon deposited by cracking the hydrocarbon made it possible to locally increase the resistance of the refractory to thermal shock in particular.
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE898080 | 1983-10-25 | ||
| BE898080 | 1983-10-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU85605A1 true LU85605A1 (en) | 1985-06-04 |
Family
ID=3862278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU85605A LU85605A1 (en) | 1983-10-25 | 1984-10-24 | Metallurgical vessel lining protection - in gas blowing zone(s) to prevent carbon burn-off |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU85605A1 (en) |
-
1984
- 1984-10-24 LU LU85605A patent/LU85605A1/en unknown
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0721388B1 (en) | Casting part comprising an external layer appropriate to form a gas impervious layer, and implementation process | |
| AR001571A1 (en) | A method and apparatus for producing metals and metal alloys | |
| FR2554024A1 (en) | IMMERSION CASTING BUSH | |
| LU85605A1 (en) | Metallurgical vessel lining protection - in gas blowing zone(s) to prevent carbon burn-off | |
| EP0626549B1 (en) | Metallurgical electric arc furnace and process using such a furnace | |
| FR2579621A1 (en) | BLOWING LANCE FOR THE TREATMENT OF METALLIC BATHS IN METALLURGICAL PLANTS | |
| FR3094249A1 (en) | Cattail buffer | |
| BE898080A (en) | Metallurgical vessel lining protection - in gas blowing zone(s) to prevent carbon burn-off | |
| AU1215483A (en) | Protective gas sheath for jet of molten metal | |
| FR2513909A1 (en) | METHOD AND APPARATUS FOR TREATING LIQUID METAL IN A CONTAINER | |
| WO1995034395A1 (en) | Casting part comprising an external layer appropriate to form a gas impervious layer, and implementation process | |
| Bannenberg et al. | Improvements in steel cleanliness by tundish inertisation | |
| EP0093040B1 (en) | Process for increasing the life of gas-permeable refractory elements in the bottoms of metallurgical vessels, especially for steel-basic-oxygen furnaces | |
| EP0080403A1 (en) | Installation for introducing gas into a bath of liquid metal | |
| US4432536A (en) | Molten iron containing vessel with improved refractory lining | |
| US5016788A (en) | Pouring spout for servo-assisted opening, device incorporating it and implementation process | |
| BE1004483A3 (en) | Heating method for bath liquid steel. | |
| CA1098321A (en) | Production process of stainless steel by means of a converter | |
| Archenholtz | Overcoming the Problems of Holding Treated S. G. Iron | |
| LU84592A1 (en) | THERMAL PROTECTION COATING | |
| EP0093039B1 (en) | Process for increasing the gas-permeability of fire-proof elements in the bottoms of metallurgical vessels, and materials for carrying it out | |
| BE892182A (en) | IMPROVEMENTS IN METHODS OF BREWING A METAL BATH | |
| FI831964A0 (en) | PROCEDURE FOR THE PROCESSING OF METALLURGICAL BEARING | |
| KR960037176A (en) | Molten metal injection nozzle | |
| BE846020A (en) | BREATHING LANCE IMPROVEMENTS IN A METAL BATH |