EP0028968A1 - Process for treating a metal in a melting bath - Google Patents

Process for treating a metal in a melting bath Download PDF

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Publication number
EP0028968A1
EP0028968A1 EP80401551A EP80401551A EP0028968A1 EP 0028968 A1 EP0028968 A1 EP 0028968A1 EP 80401551 A EP80401551 A EP 80401551A EP 80401551 A EP80401551 A EP 80401551A EP 0028968 A1 EP0028968 A1 EP 0028968A1
Authority
EP
European Patent Office
Prior art keywords
jet
oxygen
protective gas
bath
metal
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.)
Withdrawn
Application number
EP80401551A
Other languages
German (de)
French (fr)
Inventor
Guy Savard
Robert Gum Hong Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Liquide Canada Inc
Canadian Liquid Air Ltd
Original Assignee
Air Liquide Canada Inc
Canadian Liquid Air Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Air Liquide Canada Inc, Canadian Liquid Air Ltd filed Critical Air Liquide Canada Inc
Publication of EP0028968A1 publication Critical patent/EP0028968A1/en
Withdrawn legal-status Critical Current

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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
    • C21C5/34—Blowing through the bath
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B13/00—Obtaining lead
    • C22B13/02—Obtaining lead by dry processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B15/00—Obtaining copper
    • C22B15/0026—Pyrometallurgy
    • C22B15/0028—Smelting or converting
    • C22B15/003—Bath smelting or converting
    • C22B15/0041—Bath smelting or converting in converters
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B23/00—Obtaining nickel or cobalt
    • C22B23/02—Obtaining nickel or cobalt by dry processes
    • C22B23/025—Obtaining nickel or cobalt by dry processes with formation of a matte or by matte refining or converting into nickel or cobalt, e.g. by the Oxford process
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
    • C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents

Definitions

  • the invention relates to methods of treating metals in molten baths which involve injecting oxygen through the bottom of a tank containing the molten metal. This type of process is applied in particular in the refining of metals from concentrated ores for the manufacture of steel by refining of cast iron.
  • the present invention provides a method of treating a metal in a molten bath according to which a reactive product with oxygen is pneumatically introduced into a bath of molten metal at the same time as injecting the oxygen in this bath, which consists of the injection of oxygen in the form of a jet adjacent to a jet of protective gas, while the reactive product is conveyed in the molten metal in sprayed form in said protective gas jet.
  • the method according to the invention can be applied in this form to all kinds of metal treatments in molten baths, whether in particular refining of cast iron or treatment of ores such as lead sulfide.
  • the adjacent jets can in particular be in contact with each other over their length, one of the jets being for example surrounded by the other.
  • the pulverized product introduced into the molten bath may in particular be a product which oxidizes in the presence of oxygen, unless it is diluted in an inert gas such as nitrogen, or which forms an explosive mixture with any gas essentially consisting of 'oxygen.
  • This product can in particular be a flux useful for a refining reaction or another product participating in the desired reaction, such as concentrates of metal ores.
  • the flux or the ore and the oxygen are conveyed directly into the reaction zone with the oxygen inside the molten metal, so that the reaction can take place. perform efficiently and safely without significant erosion of the refractory lining containing the molten metal bath.
  • the oxygen jet can be surrounded by the protective gas jet or the protective gas jet can be surrounded by the oxygen jet.
  • the oxygen jet it is advantageous for the oxygen jet to be further surrounded by a second jet of protective gas, so as to avoid deterioration of the refractory lining.
  • the protective gas can for example be constituted by a hydrocarbon, and in particular a gaseous hydrocarbon such as propane, by another gas such as sulfur dioxide, carbon monoxide, carbon dioxide, nitrogen, vapor d water or argon, or any other fluid behaving in a manner substantially inert in the oxidation reaction and not involved in the metal refining process.
  • a hydrocarbon such as propane
  • another gas such as sulfur dioxide, carbon monoxide, carbon dioxide, nitrogen, vapor d water or argon, or any other fluid behaving in a manner substantially inert in the oxidation reaction and not involved in the metal refining process.
  • the process according to the invention applies in a very particularly advantageous manner to the production of metals such as lead, cobalt and copper from the concentrates of the corresponding sulfides, but it can also be used for the treatment of other metallic ores giving rise to too strong a reaction in an oxygen jet.
  • oxygen is used in the form of oxygen diluted in air, this has the disadvantage of requiring additional heat to be consumed by the refining reaction, and therefore of adversely affecting the economic profitability of the operation.
  • a lead sulphide concentrate containing the following main constituents in the indicated weight proportions: lead 72%, sulfur 15%, copper 1%, iron 3%, C0 2 3%
  • the reaction requires 0, 16 m 3 of oxygen for 1 kg of concentrate for the operation to be complete.
  • the concentrate is conveyed pneumatically to an oxygen reaction zone located within the liquid lead bath.
  • the concentrate is entrained by the protective gas in the annular jet which surrounds the oxygen jet.
  • the quantity of protective gas necessary to thus entrain 1 kg of concentrate is advantageously of the order of 0.001 to 0.05 m.
  • This volume of protective gas can vary within very wide limits and the proportion used can in fact be chosen so as to maintain the desired thermal balance while remaining within the range suitable for pneumatic transport.
  • the injection nozzles comprise three concentric tubes forming between them two annular intervals around the central jet.
  • the internal tube is used to convey the jet of flux or metallic ore in an inert gas, in particular in a protective fluid as described above.
  • the annular space between the inner tube and the intermediate tube is used for the gaseous oxygen ensuring the refining reaction and the annular space between the intermediate tube and the tube external is used to conduct a protective gas which prevents the attack of the wall of refractory material constituting the internal lining of the converter.
  • the protective gas of the outer ring can naturally be of the same nature as that of the central jet. It prevents the reaction caused by oxygen in contact with the bath from occurring as soon as it leaves the nozzles.
  • the metal ore concentrate To be admitted into the central jet, and as in the case of the annular jet of the previous embodiment, the metal ore concentrate must be reduced in powder form, with particle sizes generally less than 1 mm, while in prior techniques it was used in a coarser form to be introduced over the bath.
  • the invention is not limited to the specific applications envisaged by way of examples. And it is understood that the method according to the invention can be applied with advantage in all cases where it is useful to admit a reactive solid product at the same time as oxygen in a molten metal bath.

Abstract

Suivant le procédé on introduit pneumatiquement un produit réactif avec l'oxygène dans un bain de métal fondu en même temps que l'on injecte de l'oxygène dans ce bain. Le produit réactif peut être en particulier un concentré de mineral tel que le sulfure de plomb, dans la production de métal correspondant.According to the process, a product reactive with oxygen is pneumatically introduced into a bath of molten metal at the same time as oxygen is injected into this bath. The reactive product can in particular be a mineral concentrate such as lead sulfide, in the production of the corresponding metal.

Description

L'invention concerne les procédés de traitement de métaux en bains fondus qui impliquent une injection d'oxygène à travers le fond d'une cuve contenant le métal en fusion. Ce genre de procédé est appliqué en particulier dans l'affinage de métaux à partir de minerais concentrés pour la fabrication d'acier par affinage de la fonte.The invention relates to methods of treating metals in molten baths which involve injecting oxygen through the bottom of a tank containing the molten metal. This type of process is applied in particular in the refining of metals from concentrated ores for the manufacture of steel by refining of cast iron.

On connaît des dispositifs conçus pour permettre l'injection simultanée de plusieurs jets de gaz au fond d'un bain métallique en fusion. Ainsi, le convertisseur d'affinage de la fonte décrit dans le brevet américain No. 3 706 549 permet de combiner l'injection d'oxygène avec une injection concentrique d'un gaz protecteur. L'injection d'oxygène est alors effectuée dans le bain de métal en fusion en dessous de la surface de celui-ci, par des tuyères qui traversent le garnissage réfractaire du fond du convertisseur. Chaque tuyère comporte en fait deux buses concentriques qui terminent deux tubes coaxiaux. L'oxygène gazeux est injecté par le tube interne, tandis que l'espace annulaire compris entre le tube interne et le tube externe est utilisé pour l'admission d'un gaz de protection. Celui-ci est en général constitué par un hydrocarbure. Il forme une gaine protectrice autour du jet d'oxygène dans la zone de contact entre la paroi réfractaire et le métal en fusion, et grâce à cette protection la réaction vive qui se produit avec le métal en fusion se trouve éloignée de la paroi réfractaire. Le retard ainsi imposé à la réaction exothermique de l'oxygène et du métal fondi est suffisant pour conserver intact le garnissage réfractaire.There are known devices designed to allow the simultaneous injection of several gas jets at the bottom of a molten metal bath. Thus, the cast iron refining converter described in US Patent No. 3,706,549 makes it possible to combine the injection of oxygen with a concentric injection of a protective gas. The oxygen injection is then carried out in the molten metal bath below the surface thereof, by nozzles which pass through the refractory lining at the bottom of the converter. Each nozzle in fact comprises two concentric nozzles which terminate two coaxial tubes. Gaseous oxygen is injected through the inner tube, while the annular space between the inner tube and the outer tube is used for the intake of a shielding gas. This generally consists of a hydrocarbon. It forms a protective sheath around the jet of oxygen in the contact zone between the refractory wall and the molten metal, and thanks to this protection the lively reaction which occurs with the molten metal is distant from the refractory wall. The delay thus imposed on the exothermic reaction of the oxygen and of the molten metal is sufficient to keep the refractory lining intact.

Il est d'autre part connu, dans la fabrication de l'acier par affinage de la fonte, d'introduire un flux dans le jet d'oxygène d'une manière qui permette d'amener le flux, le métal en fusion et l'oxygène gazeux en contact intime, assurant ainsi l'efficacité du flux et un bon affinage de la fonte en fusion. Les flux couramment utilisés dans l'affinage de la fonte sont notamment la chaux, le spath et la dolomite, c'est à dire des matériaux qui sont peu réactifs pour l'oxygène gazeux, et l'on peut donc valablement prévoir d'assurer un transfert pneumatique du flux dans le jet d'oxygène gazeux. Dans le cas de flux ayant tendance à réagir avec l'oxygène, cette solution devient dangereuse et il convient de l'éviter.It is also known, in the manufacture of steel by refining cast iron, to introduce a flow into the oxygen jet in a manner which allows the flow, the molten metal and the oxygen gas in intimate contact, thus ensuring the efficiency of the flow and good refining of the molten iron. Commonly used feeds in the refining of cast iron are in particular lime, spar and dolomite, that is to say materials which are not very reactive for gaseous oxygen, and one can therefore validly plan to ensure a pneumatic transfer of the flow in the jet of gaseous oxygen. In the case of flows which tend to react with oxygen, this solution becomes dangerous and should be avoided.

Dans un domaine d'application différent, concernant la fusion directe des concentrés de sulfure de plomb, le brevet américain 3 281 237 a proposé, avec ou sans addition d'un flux, de véhiculer du sulfure de plomb pulvérisé par de l'air qui est introduit dans un bain de plomb fondu, la proportion d'oxygène dans l'air étant telle qu'elle entretienne la réaction. Mais en pratique, les exigences de sécurité interdisent un tel entraînement d'un concentré de sulfure de plomb pulvérisé dans un jet d'oxygène, en raison de la nature très explosive de ce genre de mélange.In a different field of application, concerning the direct melting of lead sulphide concentrates, American patent 3,281,237 has proposed, with or without the addition of a flux, to convey lead sulphide sprayed with air which is introduced into a bath of molten lead, the proportion of oxygen in the air being such that it maintains the reaction. However, in practice, safety requirements prohibit such entrainment of a lead sulfide concentrate sprayed in an oxygen jet, because of the very explosive nature of this kind of mixture.

Pour éviter ces inconvénients des techniques connues, la présente invention propose un procédé de traitement d'un métal en bain fondu suivant lequel on introduit pneumatiquement un produit réactif avec l'oxygène dans un bain de métal fondu en même temps que l'on injecte de l'oxygène dans ce bain, qui consiste en ce que l'injection d'oxygène s'effectue sous la forme d'un jet adjacent à un jet de gaz protecteur, tandis que le produit réactif est véhiculé dans le métal fondu sous forme pulvérisée dans ledit jet de gaz protecteur.To avoid these drawbacks of known techniques, the present invention provides a method of treating a metal in a molten bath according to which a reactive product with oxygen is pneumatically introduced into a bath of molten metal at the same time as injecting the oxygen in this bath, which consists of the injection of oxygen in the form of a jet adjacent to a jet of protective gas, while the reactive product is conveyed in the molten metal in sprayed form in said protective gas jet.

Le procédé selon l'invention peut s'appliquer sous cette forme à toutes sortes de traitements de métaux en bains fondus, qu'il s'agisse notamment de l'affinage de la fonte ou du traitement de minerais tels que le sulfure de plomb.The method according to the invention can be applied in this form to all kinds of metal treatments in molten baths, whether in particular refining of cast iron or treatment of ores such as lead sulfide.

Les jets adjacents peuvent en particulier se trouver en contact l'un avec l'autre sur leur longueur, l'un des jets étant par exemple entouré par l'autre. Le produit pulvérisé introduit dans le bain fondu peut être notamment un produit qui s'oxyde en présence de l'oxygène, sauf à être dilué dans un gaz inerte tel que l'azote, ou qui forme un mélange explosif avec tout gaz essentiellement constitué d'oxygène. Ce produit peut être notamment un flux utile à une réaction d'affinage ou un autre produit participant à la réaction souhaitée, comme les concentrés de minerais métalliques. Dans la mise en oeuvre du procédé selon l'invention, le flux ou le minerai et l'oxygène sont véhiculés directement dans la zone de réaction avec l'oxygène à l'intérieur du métal en fusion, de sorte que la réaction peut s'effectuer d'une manière efficace et sûre sans érosion notable du garnissage réfractaire contenant le bain de métal en fusion.The adjacent jets can in particular be in contact with each other over their length, one of the jets being for example surrounded by the other. The pulverized product introduced into the molten bath may in particular be a product which oxidizes in the presence of oxygen, unless it is diluted in an inert gas such as nitrogen, or which forms an explosive mixture with any gas essentially consisting of 'oxygen. This product can in particular be a flux useful for a refining reaction or another product participating in the desired reaction, such as concentrates of metal ores. In the implementation of the process according to the invention, the flux or the ore and the oxygen are conveyed directly into the reaction zone with the oxygen inside the molten metal, so that the reaction can take place. perform efficiently and safely without significant erosion of the refractory lining containing the molten metal bath.

Dans les deux jets concentriques, le jet d'oxygène peut être entouré par le jet de gaz protecteur ou le jet de gaz protecteur peut être entouré par le jet d'oxygène. Dans le second cas, il est avantageux que le jet d'oxygène soit en outre entouré par un second jet de gaz protecteur, de manière à éviter la détérioration du garnissage réfractaire.In the two concentric jets, the oxygen jet can be surrounded by the protective gas jet or the protective gas jet can be surrounded by the oxygen jet. In the second case, it is advantageous for the oxygen jet to be further surrounded by a second jet of protective gas, so as to avoid deterioration of the refractory lining.

Le gaz protecteur peut être par exemple constitué par un hydrocarbure, et notamment un hydrocarbure gazeux tel que le propane, par un autre gaz tel que l'anhydride sulfureux, l'oxyde de carbone, le gaz carbonique, l'azote, la vapeur d'eau ou l'argon, ou par tout autre fluide se comportant de manière sensiblement inerte dans la réaction d'oxydation et n'intervenant pas dans le processus d'affinage du métal.The protective gas can for example be constituted by a hydrocarbon, and in particular a gaseous hydrocarbon such as propane, by another gas such as sulfur dioxide, carbon monoxide, carbon dioxide, nitrogen, vapor d water or argon, or any other fluid behaving in a manner substantially inert in the oxidation reaction and not involved in the metal refining process.

Le procédé selon l'invention s'applique d'une manière tout particulièrement avantageuse à la production de métaux tels que le plomb, le cobalt et le cuivre à partir des concentrés des sulfures correspondants, mais il peut aussi être utilisé pour le traitement d'autres minerais métalliques donnant lieu à une réaction trop vive dans un jet d'oxygène.The process according to the invention applies in a very particularly advantageous manner to the production of metals such as lead, cobalt and copper from the concentrates of the corresponding sulfides, but it can also be used for the treatment of other metallic ores giving rise to too strong a reaction in an oxygen jet.

Si l'on utilise l'oxygène sous la forme d'oxygène dilué dans l'air, ceci a l'inconvénient d'exiger de la chaleur supplémentaire à consommer par la réaction d'affinage, et donc de nuire à la rentabilité économique de l'opération. Ainsi, notamment, pour un concentré de sulfure de plomb contenant en constituants principaux les éléments suivants dans les proportions pondérales indiquées : plomb 72 %, soufre 15 %, cuivre 1 %, fer 3 %, C02 3 %, la réaction demande 0,16 m3 d'oxygène pour 1 kg de concentré pour que l'opération soit complète. Quand on conduit la réaction d'affinage par la technique d'injection submergée, le concentré est véhiculé par voie pneumatique jusqu'à une zone de réaction avec l'oxygène située au sein même du bain de plomb liquide. Conformément à l'invention, le concentré est entraîné par le gaz protecteur dans le jet annulaire qui entoure le jet d'oxygène. La quantité de gaz protecteur nécessaire pour entraîner ainsi 1 kg de concentré est avantageusement de l'ordre de 0,001 à 0,05 m . Ce volume de gaz protecteur peut varier dans de très larges limites et la proportion utilisée peut en fait être choisie de manière à maintenir le bilan thermique souhaité tout en restant dans la gamme convenant au transport pneumatique.If oxygen is used in the form of oxygen diluted in air, this has the disadvantage of requiring additional heat to be consumed by the refining reaction, and therefore of adversely affecting the economic profitability of the operation. Thus, in particular, for a lead sulphide concentrate containing the following main constituents in the indicated weight proportions: lead 72%, sulfur 15%, copper 1%, iron 3%, C0 2 3%, the reaction requires 0, 16 m 3 of oxygen for 1 kg of concentrate for the operation to be complete. When the refining reaction is carried out by the submerged injection technique, the concentrate is conveyed pneumatically to an oxygen reaction zone located within the liquid lead bath. According to the invention, the concentrate is entrained by the protective gas in the annular jet which surrounds the oxygen jet. The quantity of protective gas necessary to thus entrain 1 kg of concentrate is advantageously of the order of 0.001 to 0.05 m. This volume of protective gas can vary within very wide limits and the proportion used can in fact be chosen so as to maintain the desired thermal balance while remaining within the range suitable for pneumatic transport.

Dans une autre forme de réalisation suivant l'invention, les tuyères d'injection comportent trois tubes concentriques ménageant entre eux deux intervalles annulaires autour du jet central. Le tube interne sert à véhiculer le jet de flux ou de minerai métallique dans un gaz inerte, notamment dans un fluide protecteur tel que décrit ci-dessus. L'espace annulaire entre le tube interne et le tube intermédiaire est utilisé pour l'oxygène gazeux assurant la réaction d'affinage et l'espace annulaire entre le tube intermédiaire et le tube externe est utilisé pour conduire un gaz protecteur qui empêche l'attaque de la paroi de matériau réfractaire constituant le garnissage interne du convertisseur.In another embodiment according to the invention, the injection nozzles comprise three concentric tubes forming between them two annular intervals around the central jet. The internal tube is used to convey the jet of flux or metallic ore in an inert gas, in particular in a protective fluid as described above. The annular space between the inner tube and the intermediate tube is used for the gaseous oxygen ensuring the refining reaction and the annular space between the intermediate tube and the tube external is used to conduct a protective gas which prevents the attack of the wall of refractory material constituting the internal lining of the converter.

Le gaz protecteur de la couronne extérieure peut naturellement être de même nature que celui du jet central. Il évite que la réaction provoquée par l'oxygène au contact du bain se produise dès la sortie des tuyères.The protective gas of the outer ring can naturally be of the same nature as that of the central jet. It prevents the reaction caused by oxygen in contact with the bath from occurring as soon as it leaves the nozzles.

Pour être admis dans le jet central, et comme dans le cas du jet annulaire du mode de mise en oeuvre précédent, le concentré de minerai métallique doit être réduit sous forme de poudre, avec des dimensions de particules généralement inférieures à 1 mm, alors que dans les techniques antérieures il était utilisé sour forme plus grossière pour être introduit au-dessus du bain.To be admitted into the central jet, and as in the case of the annular jet of the previous embodiment, the metal ore concentrate must be reduced in powder form, with particle sizes generally less than 1 mm, while in prior techniques it was used in a coarser form to be introduced over the bath.

Naturellement, l'invention n'est pas limitée aux applications particulières envisagées à titre d'exemples. Et l'on comprend que le procédé selon l'invention peut être appliqué avec avantage dans tous les cas où il est utile d'admettre un produit solide réactif en même temps que de l'oxygène dans un bain métallique en fusion.Naturally, the invention is not limited to the specific applications envisaged by way of examples. And it is understood that the method according to the invention can be applied with advantage in all cases where it is useful to admit a reactive solid product at the same time as oxygen in a molten metal bath.

Claims (9)

1. Procédé de traitement d'un métal en bain fondu, caractérisé en ce que l'on injecte de l'oxygène dans ce bain sous la forme d'un jet adjacent à un jet de gaz protecteur et en ce que l'on y admet également un produit réactif véhiculé jusqu'au bain sous forme pulvérisée dans ledit jet de gaz protecteur.1. A method of treating a metal in a molten bath, characterized in that oxygen is injected into this bath in the form of a jet adjacent to a jet of protective gas and in that there is also admits a reactive product conveyed to the bath in spray form in said jet of protective gas. 2. Procédé selon la revendication 1, caractérisé en ce que ledit métal est du plomb et le produit réactif pulvérisé est du sulfure de plomb.2. Method according to claim 1, characterized in that said metal is lead and the sprayed reactive product is lead sulfide. 3. Procédé selon la revendication 1, caractérisé en ce que ledit métal est du cuivre, du cobalt, ou du nickel, et le produit réactif pulvérisé est constitué par le sulfure correspondant d'un concentré de minerai.3. Method according to claim 1, characterized in that said metal is copper, cobalt, or nickel, and the sprayed reactive product consists of the corresponding sulphide of an ore concentrate. 4. Procédé selon la revendication 1, caractérisé en ce que ledit produit est constitué d'une poudre ayant tendance à réagir vivement avec l'oxygène.4. Method according to claim 1, characterized in that said product consists of a powder tending to react strongly with oxygen. 5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le jet protecteur est constitué par un hydrocarbure.5. Method according to any one of claims 1 to 4, characterized in that the protective jet consists of a hydrocarbon. 6. Procédé selon l'une quelconque des revendications l'à 4, caractérisé en ce que le gaz protecteur est constitué d'azote, d'argon, de gaz carbonique, d'eau, d'oxyde de carbone ou d'anhydride sulfureux.6. Method according to any one of claims 1 to 4, characterized in that the protective gas consists of nitrogen, argon, carbon dioxide, water, carbon monoxide or sulfur dioxide . 7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le jet de gaz protecteur est formé annulairement autour d'un jet central d'oxygène.7. Method according to any one of claims 1 to 6, characterized in that the protective gas jet is formed annularly around a central oxygen jet. 8. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'on injecte dans ledit bain trois jets concentriques comprenant un jet annulaire d'oxygène entre un jet central de gaz protecteur et un jet annulaire extérieur de gaz protecteur.8. Method according to any one of claims 1 to 6, characterized in that one injects into said bath three concentric jets comprising an annular jet of oxygen between a central jet of protective gas and an external annular jet of protective gas . 9. Procédé selon la revendication 8, caractérisé en ce que le produit pulvérisé est entraîné par un gaz inerte constituant le gaz protecteur du jet central.9. Method according to claim 8, characterized in that the sprayed product is entrained by an inert gas constituting the protective gas of the central jet.
EP80401551A 1979-10-31 1980-10-31 Process for treating a metal in a melting bath Withdrawn EP0028968A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA338906 1979-10-31
CA000338906A CA1141175A (en) 1979-10-31 1979-10-31 Method of safely injecting oxygen reactive materials into a submerged oxygen gas stream

Publications (1)

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EP0028968A1 true EP0028968A1 (en) 1981-05-20

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US (1) US4315774A (en)
EP (1) EP0028968A1 (en)
JP (1) JPS5681642A (en)
AU (1) AU6402580A (en)
CA (1) CA1141175A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0199441A1 (en) * 1985-03-04 1986-10-29 Inco Limited Reductive smelting of sulfides and a burner therefor

Citations (9)

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JPS5681642A (en) 1981-07-03
US4315774A (en) 1982-02-16
CA1141175A (en) 1983-02-15
AU6402580A (en) 1981-05-07

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