EP0093040B1 - Process for increasing the life of gas-permeable refractory elements in the bottoms of metallurgical vessels, especially for steel-basic-oxygen furnaces - Google Patents
Process for increasing the life of gas-permeable refractory elements in the bottoms of metallurgical vessels, especially for steel-basic-oxygen furnaces Download PDFInfo
- Publication number
- EP0093040B1 EP0093040B1 EP83400766A EP83400766A EP0093040B1 EP 0093040 B1 EP0093040 B1 EP 0093040B1 EP 83400766 A EP83400766 A EP 83400766A EP 83400766 A EP83400766 A EP 83400766A EP 0093040 B1 EP0093040 B1 EP 0093040B1
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- EP
- European Patent Office
- Prior art keywords
- slag
- converter
- elements
- permeable refractory
- increasing
- 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
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Classifications
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- 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 or breaking away linings
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- 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
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- 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
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- 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
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
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- 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
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- 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
- F27D1/0003—Linings or walls
- F27D1/003—Linings or walls comprising porous bricks
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/02—Preheating, e.g. in a laminating line
- F27M2003/025—Drying
Definitions
- the present invention relates to the field of the production of metals, in particular steel. More specifically, it relates to metallurgical refining vessels, in particular steel refinery converters with top-blown oxygen blowing, the bottom of which is provided with permeable refractory elements.
- Metallurgical treatments consist in subjecting a bath of molten metal to pneumatic stirring by controlled injection of a stirring fluid, usually an inert gas such as nitrogen or argon, through permeable refractory elements mounted in the usual refractory lining which forms the bottom of the container containing the bath (FR-A-2,322,202, US No. 3,259,484).
- a stirring fluid usually an inert gas such as nitrogen or argon
- the subject of the invention is a method for improving the life of the permeable refractory elements fitted to the bottom of metallurgical refining vessels, in particular the converters of steel blown from above, said elements serving for the controlled injection of a stirring fluid into the molten metal bath contained in the container, process characterized in that during the refining of any charge, a fluid slag is formed which is kept then in the converter after casting the molten metal by tilting said container; in that the container is straightened in a vertical position so that the milk is deposited and distributed on the bottom; and in that said slag is allowed to dry and ensure its setting while maintaining in the permeable refractory elements a sufficient pressure to ensure a permanent flow of the brewing fluid not exceeding approximately 30 m 3 / h per element, counted in m 3 gas, so as to form a network of channels connecting the blowing face of said elements to the free surface of the bottom through the layer of slag deposited.
- the metallurgical refining container is a converter of steelworks to oxygen blown from above (type LD), it being understood that the invention also applies to any metallurgical container capable of tipping over. around a horizontal axis and in which the refining operation is accompanied by the formation of a slag.
- the deposition technique according to the invention is inspired by the practice of maintaining the funds of steelworks converters, known under the Anglo-Saxon name pictured "slagging-in” and reported, for example, in the European patent application. published n ° 0007657. It can be carried out systematically after each charge, or at least after each charge which has led to exposure, even partial, of the permeable refractory elements.
- the proposed method is very simple and poses no uncontrolled difficulty. It supposes only the precaution of forming, during, or more simply at the end of refining of a charge, a slag capable, by its fluidity, of flowing along the wall of the converter, then spreading over the bottom and stick to it while hardening. In practice, this boils down to a person skilled in the art to a visual verification of the slag's ability to meet these three requirements, which, moreover, is intended to be designated by the expression "we form a fluid slag" used in the above formulation of the object of the invention.
- thinning agents such as fluorspar, or other usual flux, which lowers its melting temperature.
- thickeners will be added to the slag, for example dolomite or any other refractory oxide or mixture of refractory oxides which is commonly used in steel works.
- the slag forms a refractory layer which subtracts the permeable elements from direct contact with the molten metal bath. Furthermore, the presence of these permeable elements at the bottom does not imply any other requirement during the hardening of the slag than that which consists in maintaining through them a low flow rate of brewing fluid, flow which can be qualified "safety" and which, moreover, does not penalize productivity in any way, since it takes place during the necessary hardening of the slag.
- a possible indicator of the "level" of permeability can be constituted by the pressure / flow rate ratio of fluid in the supply line of the latter to the permeable refractory element. This ratio can be determined from a reference value taken when the element is in the new state by vacuum blowing, or during the refining of the first charge to the converter.
- stirring fluid which can, for one part, circulate laterally in zones of less pressure drop which possibly form at the interface of the layer of slag deposited and of the pre-existing refractory bottom.
- the technique according to the invention can be implemented at any time, between any two loads of the same campaign or even at the end of the first load, on a converter in the state new.
Abstract
Description
La présente invention se situe dans le domaine de l'élaboration des métaux, notamment de l'acier. Elle concerne plus précisément les récipients métallurgiques d'affinage, notamment les convertisseurs d'aciérie à soufflage d'oxygène d'affinage par le haut, et dont le fond est pourvu d'éléments réfractaires perméables.The present invention relates to the field of the production of metals, in particular steel. More specifically, it relates to metallurgical refining vessels, in particular steel refinery converters with top-blown oxygen blowing, the bottom of which is provided with permeable refractory elements.
On connaît des traitements métallurgiques qui consistent à soumettre un bain de métal en fusion à un brassage pneumatique par injection contrôlée d'un fluide de brassage, habituellement un gaz inerte comme l'azote ou l'argon, au travers d'éléments réfractaires perméables montés dans le revêtement réfractaire habituel qui forme le fond du récipient contenant le bain (FR-A-2.322.202, US n° 3.259.484).Metallurgical treatments are known which consist in subjecting a bath of molten metal to pneumatic stirring by controlled injection of a stirring fluid, usually an inert gas such as nitrogen or argon, through permeable refractory elements mounted in the usual refractory lining which forms the bottom of the container containing the bath (FR-A-2,322,202, US No. 3,259,484).
L'application d'une telle technique de brassage à un convertisseur d'aciérie à l'oxygène soufflé par la haut (voir par exemple EP-A-0032 343), se développe actuellement dans le monde entier sous la dénomination commerciale "procédé LBE" (Lance - Brassage - Equilibre). Ce procédé ten à réaliser, comme son nom l'indique, l'équilibre entre métal et laitier et permet ainsi de cumuler dans une large mesure les avantages respectifs des procédés classiques d'affinage à soufflage d'oxygène par le haut et à soufflage d'oxygène par le has.The application of such a brewing technique to a converter of steelworks to oxygen blown from above (see for example EP-A-0032 343), is currently developing worldwide under the trade name "LBE process "(Lance - Brewing - Balance). This process aims to achieve, as the name suggests, the balance between metal and slag and thus allows to combine to a large extent the respective advantages of conventional refining processes with oxygen blowing from above and blowing d oxygen by the has.
De nombreuses solutions ont déjà été proposées pour conférer aux éléments réfractaires une perméabilité suffisante pour assurer un débit de fluide de brassage satisfaisant, tout en évitant une pénétration en sens inverse du métal en fusion. Parmi les solutions connues, on peut notamment citer celle décrite dans la demande de brevet européen publiée n° 0021.861 et qui consiste à ménager des passages interstitiels au sein d'une masse réfractaire étanche, soit à l'aide de corps à paroi lisse incorporés à un bloc réfractaire mono- litique, soit par assemblage de plaquettes réfractaires juxtaposées avec interposition entre elles d'entretoises calibrées.Many solutions have already been proposed to give the refractory elements sufficient permeability to ensure a satisfactory stirring fluid flow rate, while preventing penetration of the molten metal in the opposite direction. Among the known solutions, one can in particular quote that described in the European patent application published n ° 0021.861 and which consists in providing interstitial passages within a tight refractory mass, either using smooth-walled bodies incorporated in a single refractory block, either by assembling juxtaposed refractory plates with interposition of calibrated spacers between them.
Par ailleurs, ces éléments, comme tout matériau réfractaire, s'usent inévitablement au contact du métal en fusion. Cette usure est en outre accélérée en raison même du soufflage gazeux qui provoque des mouvements de convection du métal liquide très sensibles au niveau des éléments de soufflage mais dont les effets induits se font également sentire sur la durée de vie du réfractaire classique environnant. A ce égard, l'expérience montre que, dans le cas convertisseurs traditionnels à soufflage d'oxgène par le haut (type L.D.), le fond s'use généralement moins vite que le réfractaire en paroi, alors que c'est plutôt le contraire qui se passage lôrsqueces convertisseurs sont munis dans le fond d'éléments réfractaires perméables.Furthermore, these elements, like any refractory material, inevitably wear out in contact with the molten metal. This wear is further accelerated by the very gas blowing which causes convection movements of the liquid metal which are very sensitive at the level of the blowing elements but whose induced effects are also felt over the life of the surrounding conventional refractory. In this respect, experience shows that, in the case of traditional top-blown oxygen-type converters (LD type), the bottom generally wears out more slowly than the refractory on the wall, whereas it is quite the opposite. which happens when these converters are provided at the bottom with permeable refractory elements.
Sinon à devoir fréquemment réparer le fond et remplacer les éléments perméables usagés, ce qui serait fortement pénalisant, le problème qui se pose est donc celui de savoir s'il est possible de ralentir la vitesse d'usure de ces éléments, et ceci tout en préservant leur perméabilité.If not to have to frequently repair the bottom and replace the used permeable elements, which would be highly penalizing, the problem which arises is therefore to know if it is possible to slow down the rate of wear of these elements, and this while preserving their permeability.
Dans ce but, l'invention a pour objet un procédé pour améliorer la durée de vie des éléments réfractaires perméables équipant le fond des récipients métallurgiques d'affinage, notamment les convertisseurs d'aciére à soufflage d'oxygène par le haut, lesdits éléments servant pour l'injection contrôlée d'un fluide de brassage dans le bain de métal en fusion contenu dans le récipient, procédé caractérisé en ce que au cours de l'affinage d'une charge quelconque, on forme un laitier fluide que l'on conserve ensuite dans le convertisseur après coulée du métal en fusion par basculement dudit récipient; en ce que l'on redresse le récipient en position verticale de manière que le laiter se dépose et se repartisse sur le fond; et en ce qu'on laisse sécher ledit laitier et assurer sa prise tout en maintenant dans les éléments réfractaires perméables une pression suffisante pour assurer un débit permanent du fluide de brassage n'excédant pas 30 m3/h environ par élément, compté en m3 gazeux, de manière à former un réseau de canaux reliant la face du soufflage desdits éléments à la surface libre du fond au travers de la couche de laitier déposée.To this end, the subject of the invention is a method for improving the life of the permeable refractory elements fitted to the bottom of metallurgical refining vessels, in particular the converters of steel blown from above, said elements serving for the controlled injection of a stirring fluid into the molten metal bath contained in the container, process characterized in that during the refining of any charge, a fluid slag is formed which is kept then in the converter after casting the molten metal by tilting said container; in that the container is straightened in a vertical position so that the milk is deposited and distributed on the bottom; and in that said slag is allowed to dry and ensure its setting while maintaining in the permeable refractory elements a sufficient pressure to ensure a permanent flow of the brewing fluid not exceeding approximately 30 m 3 / h per element, counted in m 3 gas, so as to form a network of channels connecting the blowing face of said elements to the free surface of the bottom through the layer of slag deposited.
Le cas échéant, on pourra parfaire la répartition du laitier sur le fond en faisant basculer le convertisseur de part et d'autre de sa position verticale.If necessary, we can perfect the distribution of slag on the bottom by tilting the converter on either side of its vertical position.
Par la suite, on considérera que le récipient métallurgique d'affinage est un convertisseur d'aciérie à l'oxygène soufflé par le haut (type L.D.), étant entendu que l'invention s'applique également à tout récipient métallurgique, susceptible de basculer autour d'un axe horizontal et dans lequel l'opération d'affinage s'accompagne de la formation d'un laitier.Subsequently, it will be considered that the metallurgical refining container is a converter of steelworks to oxygen blown from above (type LD), it being understood that the invention also applies to any metallurgical container capable of tipping over. around a horizontal axis and in which the refining operation is accompanied by the formation of a slag.
La technique de dépôt selon l'invention s'inspire de la pratique d'entretien des fonds de convertisseurs d'aciérie, connue sous la dénomination anglo-saxonne imagée "slagging-in" et rapportée, par exemple, dans la demande de brevet européen publiée n° 0007657. Elle peut être effectuée systématiquement après chaque charge, ou tout au moins après chaque charge ayant conduit à une mise à nu, même partielle, des éléments réfractaires perméables.The deposition technique according to the invention is inspired by the practice of maintaining the funds of steelworks converters, known under the Anglo-Saxon name pictured "slagging-in" and reported, for example, in the European patent application. published n ° 0007657. It can be carried out systematically after each charge, or at least after each charge which has led to exposure, even partial, of the permeable refractory elements.
La méthode proposée est d'un grande simplicité et ne pose aucune difficulté non-maîtrisée. Elle suppose uniquement la précaution de former, au cours, ou plus simplement en fin d'affinage d'une charge, un laitier capable, de par sa fluidité, de couler le long de la paroi du convertisseur, de s'étaler ensuite sur le fond et d'y coller en durcissant. En pratique, cela se résume pour l'homme de métier à une vérification visuelle de l'aptitude du laitier à répondre à ces trois exigences, que l'on entend d'ailleurs désigner par l'expression "on forme un laitierfluide" utilisée dans la formulation ci-avant de l'object de l'invention.The proposed method is very simple and poses no uncontrolled difficulty. It supposes only the precaution of forming, during, or more simply at the end of refining of a charge, a slag capable, by its fluidity, of flowing along the wall of the converter, then spreading over the bottom and stick to it while hardening. In practice, this boils down to a person skilled in the art to a visual verification of the slag's ability to meet these three requirements, which, moreover, is intended to be designated by the expression "we form a fluid slag" used in the above formulation of the object of the invention.
Ainsi, si le laitier n'est pas assez fluide, son étalement et son collage (prise mécanique) sur le fond ne sont plus assurés. Pour y parvenir, on pourra lui rajouter, en fin d'affinage, des agents fluidifiants, tels que du spath-fluor, ou autre fondant habituel, qui abaisse sa température de fusion. Inversement, si le laitier est trop fluide, son temps de durcissement est inutilement long. De plus, il est à craindre que son point de fusion relativement trop bas entraîner sa disparition du fond dès le début du traitement d'affinage de la charge suivante. Dans ce cas, on rajoutera au laitier des agents épaississants, par exemple de la dolomie ou tout autre oxyde refractaire ou mélange d'oxydes réfractaires dont on a un usage courant en aciérie.Thus, if the slag is not fluid enough, its spreading and bonding (mechanical grip) on the bottom are no longer guaranteed. To achieve this, we can add to it, at the end of ripening, thinning agents, such as fluorspar, or other usual flux, which lowers its melting temperature. Conversely, if the slag is too fluid, its curing time is unnecessarily long. In addition, it is to be feared that its relatively too low melting point will cause its disappearance from the bottom as soon as the refining treatment of the next charge begins. In this case, thickeners will be added to the slag, for example dolomite or any other refractory oxide or mixture of refractory oxides which is commonly used in steel works.
Une fois durci et en prise mécanique sur le fond, le laitier forme une couche réfractaire qui soustrait les éléments perméables d'un contact direct avec le bain de métal en fusion. Par ailleurs, la présence de ces éléments perméables dans le fond n'implique aucune autre exigence au cours du durcissement du laitier que celle qui consiste à maintenir au travers d'eux un faible débit de fluide de brassage, débit que l'on peut qualifier "de sécurité" et qui, de surcroît, ne pénalise aucunement la productivité, puisqu'il s'opère pendant le durcissement nécessaire du laitier.Once hardened and in mechanical grip on the bottom, the slag forms a refractory layer which subtracts the permeable elements from direct contact with the molten metal bath. Furthermore, the presence of these permeable elements at the bottom does not imply any other requirement during the hardening of the slag than that which consists in maintaining through them a low flow rate of brewing fluid, flow which can be qualified "safety" and which, moreover, does not penalize productivity in any way, since it takes place during the necessary hardening of the slag.
De plus, ce débit que l'on peut considérer comme perdu (c'est-à-dire non utilisé pour le traitement du bain proprement dit), n'alourdit que très faiblement le coût global de l'opération, compte tenu de sa valeur relativement faible par rapport à celle mise en oeuvre lors du brassage du bain (de l'ordre de 150 ml/h). On peut même dire que les conséquences sur le coût sont pratiquement négligeables, si on prend soin de choisir un gaz largement disponible dans le commerce, comme l'azote par exemple, ou le cas échéant, un gaz récupération produit dans l'usine elle-même, comme le CO2.In addition, this flow which can be considered lost (that is to say not used for the treatment of the bath itself), increases only very slightly the overall cost of the operation, given its relatively low value compared to that used during the mixing of the bath (of the order of 150 m l / h). One can even say that the consequences on the cost are practically negligible, if one takes care to choose a gas widely available on the market, like nitrogen for example, or if necessary, a recovered gas produced in the factory itself. same, like CO 2 .
Un fois la couche de laitier durcie, le convertisseur est prêt pour une nouvellè charge. Un constate dès le dbut du traitement d'affinage, que non seulement le preméabilité du fond est conservée, mais qu'elle a même sensiblement augmenté par rapport au niveau qu'elle avait au cours de l'affinage des charges effectuées sans dépôt préalable de laitier sur le fond.Once the slag layer has hardened, the converter is ready for a new charge. A statement from the start of the refining treatment, that not only the préablity of the bottom is preserved, but that it has even significantly increased compared to the level it had during the refining of the loads carried out without prior deposit of dairy on the bottom.
On rappelle à toutes fins utiles, qu'un indicateur possible du "niveau" de perméabilité peut être constitué par le rapport pression/débit de fluide dans la conduite d'amenée de ce dernier à l'élément réfractaire perméable. Ce rapport peut être déterminé à partir d'une valeur de référence prise lorsque l'élément est à l'état neuf par soufflage à vide, ou au cours de l'affinage de la première charge au convertisseur.It is recalled for all practical purposes, that a possible indicator of the "level" of permeability can be constituted by the pressure / flow rate ratio of fluid in the supply line of the latter to the permeable refractory element. This ratio can be determined from a reference value taken when the element is in the new state by vacuum blowing, or during the refining of the first charge to the converter.
En ce qui concerne les résultats obtenus sur la perméabilité, l'explication n'est pas encore totalement élucidée:
- - l'observation semble montrer que la préservation de la perméabilité est assurée par la présence d'un réseau de canaux reliant la face de soufflage de l'élément à la surface libre du fond au travers de la couche de laitier déposé, ce réseau se formant lors du séchage de ladite couche grâce au soufflage permanent du fluide de brassage,
- -quant à l'amélioration de cette perméabilité, il pourrait s'agir d'un phénomène interne à l'élément réfractaire perméable. On peut penser à priori que l'explication est d'origine thermique. Le refroidissement du fond, dont l'effet est accentué par le flux permanent du fluide de brassage, serait de nature à créer au sein des éléments de soufflage des contraintes mécaniques qui, en se libérant donnent naissance à un réseau de micro-fissures, s'amorçant préférentiellement en paroi des passages originels prévus pour le fluide de brassage.
- - the observation seems to show that the preservation of the permeability is ensured by the presence of a network of channels connecting the blowing face of the element to the free surface of the bottom through the layer of deposited slag, this network is forming during the drying of said layer thanks to the permanent blowing of the stirring fluid,
- as for the improvement of this permeability, it could be a phenomenon internal to the permeable refractory element. One can think a priori that the explanation is of thermal origin. The cooling of the bottom, the effect of which is accentuated by the permanent flow of the stirring fluid, would be likely to create within the blowing elements mechanical stresses which, when released, give rise to a network of micro-cracks, s '' priming preferably on the wall of the original passages provided for the stirring fluid.
On peut également penser à une explication de nature aéromécanique le fluide de brassage pouvant, pour une.part, circuler latéralement dans des zones de moindre perte de charge qui se forment éventuellement à l'interface de la couche de laitier déposée et du fond réfractaire préexistant.One can also think of an explanation of an aeromechanical nature, the stirring fluid which can, for one part, circulate laterally in zones of less pressure drop which possibly form at the interface of the layer of slag deposited and of the pre-existing refractory bottom. .
Comme on l'a déja dit, la technique selon l'invention peut-être mise en oeuvre à tout moment, entre deux charges quelconques d'une même campagne ou même dès la fin de la première charge, sur un convertisseur à l'état neuf.As already said, the technique according to the invention can be implemented at any time, between any two loads of the same campaign or even at the end of the first load, on a converter in the state new.
Il faut également souligner que, grâce à l'amélioration de la durée de vie des éléments perméables obtenue par la mise en oeuvre de l'invention, ce n'est plus la tenue du fond qui limite la durée d'une campagne. Autrement-dit, le fond n'est plus un problème pour l'usure du convertisseur, de sorte que l'on se retrouve, sur ce plan, dans la même situation qu'avec un convertisseur classique à soufflage d'oxygène par le haut (type L.D.).It should also be emphasized that, thanks to the improvement in the lifetime of the permeable elements obtained by the implementation of the invention, it is no longer the bottom behavior which limits the duration of a campaign. In other words, the bottom is no longer a problem for the wear of the converter, so that we find ourselves, on this plane, in the same situation as with a conventional converter with oxygen blowing from above. (type LD).
Par ailleurs, l'invention s'applique quelque soit le type d'éléments réfractaires perméables utilisés. Il doit être souligné cependant qu d'excellents résultats ont pu être obtenus avec les éléments évoqués au début et dont on pourra avoir plus ample connaissance en se reportant à la description détaillée qui en est faite dans la demande de brevet européen n° 0021.861 déjà citée.Furthermore, the invention applies whatever the type of permeable refractory elements used. It should be emphasized, however, that excellent results have been obtained with the elements mentioned at the start and of which we can have more knowledge by referring to the detailed description which is made of it in the European patent application No. 0021,861 already cited. .
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT83400766T ATE33401T1 (en) | 1982-04-22 | 1983-04-18 | METHOD OF EXTENSING THE DURABILITY OF REFRACTORY GAS-PERMEABLE ELEMENTS IN THE BOTTOM OF METALLURGICAL VESSELS, ESPECIALLY IN FLOATING OXYGEN CONVERTERS FOR STEEL. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8207118 | 1982-04-22 | ||
| FR8207118A FR2525633A1 (en) | 1982-04-22 | 1982-04-22 | METHOD FOR IMPROVING THE LIFETIME OF PERMEABLE REFRACTORY ELEMENTS LODGED IN THE BOTTOM OF METALLURGIC REFINING CONTAINERS, IN PARTICULAR OXYGEN-BLOW-CONTAINING OXYGEN STEEL CONVERTERS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0093040A1 EP0093040A1 (en) | 1983-11-02 |
| EP0093040B1 true EP0093040B1 (en) | 1988-04-06 |
Family
ID=9273360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83400766A Expired EP0093040B1 (en) | 1982-04-22 | 1983-04-18 | Process for increasing the life of gas-permeable refractory elements in the bottoms of metallurgical vessels, especially for steel-basic-oxygen furnaces |
Country Status (13)
| Country | Link |
|---|---|
| US (2) | US4690386A (en) |
| EP (1) | EP0093040B1 (en) |
| JP (1) | JPS5941412A (en) |
| KR (1) | KR910002863B1 (en) |
| AT (1) | ATE33401T1 (en) |
| BE (1) | BE896539A (en) |
| BR (1) | BR8302006A (en) |
| CA (1) | CA1205637A (en) |
| DE (1) | DE3376225D1 (en) |
| FR (1) | FR2525633A1 (en) |
| IT (1) | IT1194212B (en) |
| LU (1) | LU84742A1 (en) |
| ZA (1) | ZA832760B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19913335A1 (en) * | 1999-03-24 | 2000-09-28 | Linde Tech Gase Gmbh | Slag coating of a converter lining, especially of a copper refining converter, is carried out by applying slag at just above its melting point onto a lining region at just below the slag melting point |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61139533A (en) * | 1984-12-12 | 1986-06-26 | Shin Meiwa Ind Co Ltd | Apparatus for detecting abnormal condition of hinge of three-turn dump truck |
| JPS61139534A (en) * | 1984-12-12 | 1986-06-26 | Shin Meiwa Ind Co Ltd | Indicator of condition of changed-over hinge on three-turn dump truck |
| DD300677A7 (en) * | 1989-06-20 | 1992-07-02 | Eko Stahl Ag,De | METHOD FOR INCREASING THE DURABILITY OF FIRE-RESISTANT CLADDING OF METALLURGICAL GEFAESSEN |
| DE3936715A1 (en) * | 1989-11-03 | 1991-05-08 | Kortec Ag | METHOD FOR INPUTING FLOWABLE ADDITIVES INTO A METALLURGICAL VESSEL AND VESSEL FOR THIS METHOD |
| DE4003646C1 (en) * | 1990-02-07 | 1990-12-13 | Intocast Gmbh Feuerfestprodukte Und Giesshilfsmittel, 4030 Ratingen, De | |
| US5772931A (en) * | 1996-12-20 | 1998-06-30 | Dofasco Inc. | Slag coating process |
| KR20030003316A (en) * | 2001-06-30 | 2003-01-10 | 백 웨인 | A teeth of cleaner |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE631565A (en) * | ||||
| CA460246A (en) * | 1949-10-11 | B. Story Edward | Lining rotary furnace | |
| US3259484A (en) * | 1962-04-16 | 1966-07-05 | Loire Atel Forges | Method and apparatus for producing steel from pig iron |
| CA919893A (en) * | 1970-01-15 | 1973-01-30 | D. Labate Michael | Process for lining metallurgical furnaces |
| DE2028578B2 (en) * | 1970-06-10 | 1976-01-02 | Nippon Kokan K.K., Tokio | Refractory lining for furnaces or ladles for steel production |
| DE2100874A1 (en) * | 1971-01-09 | 1972-07-20 | Kretz, Erich, 4000 Düsseldorf | Support grid |
| FR2322202A1 (en) * | 1975-08-29 | 1977-03-25 | Siderurgie Fse Inst Rech | Steel refining by oxygen lancing and bottom blowing - for improved quality steel of various grades |
| JPS5337120A (en) * | 1976-09-18 | 1978-04-06 | Nippon Steel Corp | Operating method for converter |
| NL176088B (en) * | 1978-07-14 | 1984-09-17 | Estel Hoogovens Bv | METHOD FOR USING A STEEL CONVERTER AND A STEEL CONVERTER TO BE USED WITH THIS |
| US4298378A (en) * | 1978-12-22 | 1981-11-03 | Kawasaki Jukogyo Kabushiki Kaisha | Rotary steel converter, method of making steel there-with and method of applying refractory lining to converter |
| JPS5585618A (en) * | 1978-12-22 | 1980-06-27 | Kawasaki Heavy Ind Ltd | Coating method for converter with refractory material |
| CA1143947A (en) * | 1979-02-07 | 1983-04-05 | Jerry V. Spruell | Method for increasing vessel lining life for basic oxygen furnaces |
| FR2455008A1 (en) * | 1979-04-25 | 1980-11-21 | Siderurgie Fse Inst Rech | REFRACTORY PIECE WITH SELECTIVE AND ORIENTED PERMEABILITY FOR THE INSUFFLATION OF A FLUID |
| JPS5938282B2 (en) * | 1980-07-03 | 1984-09-14 | 川崎製鉄株式会社 | Slag coating method on bottom blowing converter furnace wall surface |
| JPS5811717A (en) * | 1981-07-15 | 1983-01-22 | Nippon Steel Corp | Formation of protecting layer for gas blowing hole by porous slag coating |
-
1982
- 1982-04-22 FR FR8207118A patent/FR2525633A1/en active Granted
-
1983
- 1983-04-11 LU LU84742A patent/LU84742A1/en unknown
- 1983-04-18 EP EP83400766A patent/EP0093040B1/en not_active Expired
- 1983-04-18 AT AT83400766T patent/ATE33401T1/en not_active IP Right Cessation
- 1983-04-18 DE DE8383400766T patent/DE3376225D1/en not_active Expired
- 1983-04-19 ZA ZA832760A patent/ZA832760B/en unknown
- 1983-04-19 BR BR8302006A patent/BR8302006A/en not_active IP Right Cessation
- 1983-04-20 US US06/486,844 patent/US4690386A/en not_active Expired - Fee Related
- 1983-04-21 BE BE6/47817A patent/BE896539A/en not_active IP Right Cessation
- 1983-04-21 CA CA000426382A patent/CA1205637A/en not_active Expired
- 1983-04-22 IT IT20765/83A patent/IT1194212B/en active
- 1983-04-22 KR KR1019830001714A patent/KR910002863B1/en not_active IP Right Cessation
- 1983-04-22 JP JP58071332A patent/JPS5941412A/en active Pending
-
1987
- 1987-04-15 US US07/038,542 patent/US4735398A/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19913335A1 (en) * | 1999-03-24 | 2000-09-28 | Linde Tech Gase Gmbh | Slag coating of a converter lining, especially of a copper refining converter, is carried out by applying slag at just above its melting point onto a lining region at just below the slag melting point |
Also Published As
| Publication number | Publication date |
|---|---|
| US4690386A (en) | 1987-09-01 |
| KR910002863B1 (en) | 1991-05-06 |
| FR2525633A1 (en) | 1983-10-28 |
| ATE33401T1 (en) | 1988-04-15 |
| BE896539A (en) | 1983-08-16 |
| IT1194212B (en) | 1988-09-14 |
| LU84742A1 (en) | 1983-12-05 |
| US4735398A (en) | 1988-04-05 |
| KR840004372A (en) | 1984-10-15 |
| BR8302006A (en) | 1983-12-27 |
| EP0093040A1 (en) | 1983-11-02 |
| CA1205637A (en) | 1986-06-10 |
| IT8320765A0 (en) | 1983-04-22 |
| FR2525633B1 (en) | 1984-11-09 |
| DE3376225D1 (en) | 1988-05-11 |
| JPS5941412A (en) | 1984-03-07 |
| IT8320765A1 (en) | 1984-10-22 |
| ZA832760B (en) | 1983-12-28 |
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