EP2770067A1 - Procédé de convertisseur pour la fabrication d'acier en utilisant un gaz inerte - Google Patents

Procédé de convertisseur pour la fabrication d'acier en utilisant un gaz inerte Download PDF

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Publication number
EP2770067A1
EP2770067A1 EP13156759.6A EP13156759A EP2770067A1 EP 2770067 A1 EP2770067 A1 EP 2770067A1 EP 13156759 A EP13156759 A EP 13156759A EP 2770067 A1 EP2770067 A1 EP 2770067A1
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EP
European Patent Office
Prior art keywords
gas
oxygen
molten metal
treatment
blowing
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Withdrawn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
EP13156759.6A
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German (de)
English (en)
Inventor
Stefan Dimitrov
Jens Kluge
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.)
Primetals Technologies Austria GmbH
Original Assignee
SIEMENS VAI METALS TECHNOLOGIES GmbH
Siemens VAI Metals Technologies GmbH Austria
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 SIEMENS VAI METALS TECHNOLOGIES GmbH, Siemens VAI Metals Technologies GmbH Austria filed Critical SIEMENS VAI METALS TECHNOLOGIES GmbH
Priority to EP13156759.6A priority Critical patent/EP2770067A1/fr
Priority to PCT/EP2014/053525 priority patent/WO2014131722A1/fr
Publication of EP2770067A1 publication Critical patent/EP2770067A1/fr
Withdrawn legal-status Critical Current

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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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
    • 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
    • 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
    • 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
    • C21C5/305—Afterburning
    • 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
    • C21C5/32—Blowing from above
    • 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

Definitions

  • the inflated oxygen reacts with constituents of the melt - both with iron and with other elements that can be oxidized under the process conditions existing in the converter.
  • the reaction products of such reactions - called fresh reactions - form - together with iron oxide and supplied additives such as lime or dolomite, as well as coolants such as ore or scale - a slag floating on the oxygen-treated melt or gaseous escape, for example CO as the primary product of the C Oxidation.
  • CO the primary product of the C Oxidation.
  • carbon C, silicon Si, manganese Mn, phosphorus P, vanadium V, titanium Ti are removed from the melt.
  • coolant is to be understood as meaning a solid, iron-containing cooling material comprising, for example, scrap metal such as solid pig iron or steel scrap, tinder, iron ore, dust briquettes, ie briquettes, the iron-containing dust and / or sludge and / or iron-containing Waste / residues, for example accumulating in a steel mill, included.
  • scrap metal such as solid pig iron or steel scrap
  • dust briquettes ie briquettes
  • the iron-containing dust and / or sludge and / or iron-containing Waste / residues for example accumulating in a steel mill, included.
  • the cooling effect is achieved by removing heat from the molten metal for melting and for further treatment of the coolant.
  • the molten metal to be treated is formed by combining a starting amount of liquid molten iron with solid coolant, for example, scrap.
  • solid coolant for example, scrap.
  • energy is required, which is provided for example from exothermic reactions of the oxygen with elements in the molten metal - melting scrap therefore cools the melt, it acts as a coolant during the treatment with oxygen.
  • the ratio of scrap to the starting amount of molten pig iron must be chosen so that the melt is not cooled by the scrap too much - the amount of coolant scrap is therefore limited.
  • the flushing elements in the bottom of the converter vessel for an LD process can clog, so that the stirring effect during the vessel campaign decrease or even eliminated altogether. Negative changes in the stirring effect affect the course of the reactions in the melt and in the resulting slag, so that they also have an unfavorable effect on, for example, consumption figures, accuracy with regard to targeted pig iron pretreatment / crude steel production analyzes, tapping sequence time, converter productivity.
  • the effects can be different for different process steps of pig iron pretreatment and crude steel production; For example, for the reduction of the carbon content by means of a deC-process in catch-C-operation - in German catch batches - with dephosphated pig iron an intensive stirring effect of the scavenging elements for a controlled process management is not absolutely necessary or desirable; it is even preferable to set a low stirring effect over a low gas flow. A reduction or elimination of stirring does not have a negative effect on the achievable result, it would even have a positive effect.
  • the flushing elements are designed, for example, in terms of dephosphorization so that the necessary for the required stirring gas flow can be provided, while on the other hand, the flushing elements should also work with a much lower gas flow in catch-C operation without clogging. Such conflicting requirements can only be solved with compromises that have only a negative effect on the result of both process steps and the consumption figures.
  • Gas A is a mixture of oxygen with at least one inert gas, preferably nitrogen.
  • Gas B is an inert gas, or it is a mixture of at least two different inert gases, or it is a mixture of oxygen with at least one inert gas, preferably nitrogen.
  • Gas B is characterized as containing at least 3 vol% and up to 100 vol% inert gas and containing 0 vol% to 97 vol% oxygen. It is used for stirring for mixing and heat transfer to the molten metal and optionally for freshness.
  • Gas A is characterized as containing at least 10% by volume and up to 85% by volume of inert gas and containing 15% to 90% by volume of oxygen. It is used primarily for afterburning and stirring for heat transfer to the molten metal.
  • the temperatures of gas B exiting the inflator and the temperature of gas A exiting the injector are below 200 ° C, preferably at or below ambient temperature. For such temperatures, little or no effort is required to heat the mixtures. Preferably, the temperatures are at or below ambient temperature, then no effort for heating is necessary. Since technical gases that make up the gases A and B - obtained, for example, by mixing one or more inert gases with each other or with oxygen, optionally cooled or cooled in the preparation of the mixtures by expansion, or upon exiting the inflator or the Cool blowing device by expansion - since they are under elevated pressure to atmospheric pressure until then - the gases A and / or B may also have a temperature below ambient temperature.
  • the gases A and / or B are compressed before exiting the inflator or injector, they may be heated to ambient temperature upon exit.
  • the gases A and / or B preferably do not pass through devices which are intended primarily for heating the gases A and / or B before they are injected or inflated.
  • ambient temperature is meant the temperature of the environment in which a metallurgical plant in which the process according to the invention is carried out stands. This includes regional temperature fluctuations of the atmosphere depending on the location at different points on the earth.
  • Gas A and Gas B can be the same. Preferably, they are different in order to be optimally matched to their respective task - with regard to the entire process sequence in the converter vessel.
  • inert gas is to be understood as a gas which is practically inert under the conditions prevailing in the melt or in the converter vessel during blowing and / or inflation conditions, so practically no chemical reactions - while nitrogen is also regarded as an inert gas, which is slightly dissolved in the melt and can form in the slag under the prevailing oxidation conditions in the converter only unstable nitrides.
  • inflating the gas B according to the invention inflation of at least technically pure, with an oxygen content of> 99 vol.%, Preferably> 99.5 vol.%, Is practiced in comparison to the inflation practiced so far in the case of the LD process or bottom-blowing processes such as the K-OBM process.
  • Oxygen reaches an improved stirring effect by the inflated gas in the molten metal.
  • the inert gas does not react with the molten metal and can therefore penetrate deeper into the melt as an inflated gas jet before it escapes from it. The penetrated inert gas expands due to its heating in the molten metal.
  • coolant is to be understood as meaning a solid, iron-containing cooling material comprising, for example, scrap metal such as solid pig iron or steel scrap, tinder, iron ore, dust briquettes, ie briquettes, the iron-containing dust and / or sludge and / or iron-containing Waste / residues, for example accumulating in a steel mill, included.
  • scrap metal such as solid pig iron or steel scrap
  • dust briquettes ie briquettes
  • the iron-containing dust and / or sludge and / or iron-containing Waste / residues for example accumulating in a steel mill
  • the purging elements may be designed to operate at the low gas flow in catch-C operation without clogging hazard; the stronger stirring action required for dephosphorization does not have to be achieved
  • the inventive method Compared with bottom-blowing methods that inflate hot blast on the molten metal, the inventive method has the advantage that the gas B has a much lower temperature than hot blast. Therefore, it expands more, resulting in a comparatively stronger stirring action, which in turn leads to improved heat transfer from CO afterburning. In addition, can be dispensed with equipment, which is needed to produce hot air.
  • gas B contains less than at least 3% by volume of inert gas, the metal melt is not supplied with enough inert gas to achieve the described stirring effect to an economically usable extent.
  • gas B may be a mixture of argon and nitrogen.
  • the blowing of the gas A, so a mixture of oxygen with at least one inert gas, preferably nitrogen, in the space in the converter vessel above the molten metal from a blowing allows efficient afterburning of existing in this room combustible gases, such as CO, which in oxidation of the in the Molten metal contained carbon arises.
  • This post-combustion can supply part of the released energy in the form of heat to the molten metal. Therefore, with afterburning and improved supply of the released energy into the molten metal more coolant be used as a part of the energy required for its melting and for further treatment from the CO post-combustion is provided.
  • the method according to the invention allows an increase in the amount of coolant that can be dispensed compared with conventional methods, in which the afterburning takes place using at least technically pure oxygen, since it enables improved afterburning and improved transfer of the energy released during afterburning to the molten metal.
  • Efficient afterburning requires temporally and locally stable supply of the oxygen required for the afterburning to the place of the afterburning reaction - via the empty space of the converter vessel - the space of the converter vessel above the molten metal - and slag, namely as evenly distributed.
  • the amount of slag varies with time, for example, almost no slag during melting at the beginning of refining and substantially more slag towards the end of refining.
  • the properties of the slag such as chemical composition, viscosity, density, foaming behavior change. Therefore, it may happen that injected by a blower from a certain location injected oxygen to different extents after exiting the injector by post-combustion - the jet of oxygen thus has a different depth of penetration of the space in which it is blown.
  • the slag may reach the injector so that the oxygen immediately after leaving the injector flows into a foamy slag with a high CO content, whereby it is quickly consumed. Accordingly, it can only contribute a little to the mixing of the slag by its rapidly decreasing momentum. Mixing of the slag is necessary, however, in order to transfer the heat generated during the afterburning to the molten metal.
  • the slag is then greatly overheated locally and the refractory wear in adjacent areas of the lining of the converter vessel increases. At other times, the slag may be far away from the sparger so that an oxygen jet may continue to flow through the room until it is consumed by post combustion. Such a jet can transmit more momentum for mixing, resulting in better heat transfer to the molten metal.
  • the desired degree of post-combustion may change during the process of treating the molten metal, which changes in the oxygenation rate for the afterburning is necessary. Changes in the oxygen supply rate result in altered properties of the oxygen jet in terms of pressure, pulse velocity, penetration depth and thus the mixing properties. Overall, this results in the use of - at least technically pure - oxygen for afterburning the disadvantages mentioned.
  • the use according to the invention of a mixture of oxygen with inert gas has the advantage with respect to afterburning that the inert gas is not consumed during the afterburning. Due to the inert gas, the gas A injected as jet is stabilized with respect to a jet of technically pure oxygen with respect to fluctuations of, for example, pressure, velocity, momentum, penetration depth, mixing properties. Optionally, by an on-line regulation of the Inertgasanteils regardless of the oxygen content of the beam to the currently prevailing process conditions - for example, Nachverbrennungsgrad, amount / properties / behavior of the slag - are adjusted. This stabilization reduces disadvantages caused by variations in the use of oxygen.
  • a jet of gas A blown in according to the invention has a higher pressure, a higher velocity, a higher momentum and a higher penetration depth, and thus better mixing properties, at the same oxygen feed rate.
  • the thermal expansion of the inert gas by heating while passing through the space above the molten metal - the gas A is indeed injected at a temperature below that in the space above the molten metal prevailing temperature is. This expansion induces a circulation of the slag, which results in a better transfer of energy from the post-combustion to the molten metal.
  • the afterburning takes place along a longer path, so that refractory wear due to local overheating can be largely avoided.
  • the injection device compared with the use of 'at least technically pure oxygen, there is the advantage that the gas under the conditions prevailing in the converter vessel, inter alia high temperature, the injection device itself and the nearby refractory lining of the converter vessel are less chemically and thermally less attacks or claims. Besides, one is largely stable cooling of the injector possible because when changing the oxygen supply rates required for afterburning by means of opposing changes in the inert gas, the gas flow and thus the cooling effect can be kept substantially constant.
  • gas A Compared to the use of hot air for the afterburning of CO, the use according to the invention of gas A has the advantage that, as a result of the greater temperature difference, the gas A, especially its inert gas portion, expands more strongly, which leads to increased expansion-related advantageous effects. As a result, heat from the post-combustion is better transferred to the molten metal. In addition, can be dispensed with elaborate devices and process steps for heating the oxygen-supplying gas, which are necessary when using hot blast.
  • the stirring effect by the gas A contributes to better transfer of energy from the post-combustion in the molten metal, and thus makes a contribution to be able to admit more coolant.
  • the metal melt is not supplied with sufficient inert gas for the purpose of achieving the described stirring effect to an economically useful extent.
  • the gas A contains more than 85% by volume of inert gas, the supply of oxygen for after-burning of CO is not given to an economically useful extent.
  • nitrogen and / or argon may be present in gas A and / or gas B.
  • Nitrogen and / or argon is preferably present in gas B as the inert gas.
  • argon is used in gas B, if nitriding of the molten metal is to be avoided.
  • gas A for reasons of cost, preferably only nitrogen is present.
  • the gas B or the gas A is produced by mixing two or more gases, this is done, for example, so that the gases to be mixed after the TOP take-over point, for example, with all the individual gases with a pressure at the TOP of ⁇ 15-16 bar - for each of the gases A and B separately in valve stalls - optionally on-line controlled according to currently determined process requirements - mixed and from there via gas lines - for example, piping or hoses - are led to the inflator or injector.
  • the gas B and / or the gas A is air.
  • the air can be dry compressed air.
  • Gas A and / or gas B can of course also be prepared by mixing air, for example dry compressed air, with, for example, technically pure oxygen or, for example, technically pure nitrogen. Such mixtures can also be referred to as cold wind.
  • Previous or subsequent steps of a process for treating a molten metal contained in a converter vessel, which contains metal predominantly iron, can be carried out conventionally or according to the invention.
  • the production of crude steel by LD process is the production of crude steel by LD process.
  • This can be an LD process with-apart from a possibly previously performed desulfurization deS the pig iron not previously treated - act liquid pig iron, or to an LD process under deC of - in addition to desulfurization - previously treated pig iron.
  • the pretreatment can be deSi, deMn, deP, deV, deTi; it can be carried out in a converter vessel other than the LD method.
  • the removal of the optionally present in the pig iron melt accompanying elements Si, Mn, P, Ti and / or V in an oxidizing treatment of the pig iron melt is basically based on the currently valid oxidation potentials for each element, which is the currently prevailing thermodynamic-kinetic conditions - including Temperature - at the reaction site in the system molten metal slag gas phase during the process result.
  • the oxidation of Ti, V and / or Mn is usually parallel to the oxidation of Si, while the removal of P after almost complete removal / oxidation of Si, Ti and V and / or a substantial reduction in the Mn content in the molten metal takes place.
  • Previous or subsequent steps of a process for treating a molten metal contained in a converter vessel, which contains metal predominantly iron, can be carried out conventionally or according to the invention.
  • a Bodenblasendes or a combined - from the bottom or the side walls of the converter vessel below the bath level of the molten metal is a Bodenblasendes or a combined - from the bottom or the side walls of the converter vessel below the bath level of the molten metal, and from above-blowing method, for example an OBM or K-OBM method.
  • the proportion of the inert gas in the gas A and / or gas B is varied during the treatment. This can be responded to various requirements in the process flow; For example, in a process phase in which more weight is placed on the oxygen supply than on the provision of the stirring effect, the oxygen content can be increased at the expense of the inert gas content. Conversely, in process phases in which the stirring effect is more important, the inert gas content in the mixture can be increased at the expense of the oxygen content.
  • the gas A and the gas B are supplied by means of a blowing lance comprising the inflator and the blowing device.
  • a blowing lance comprising the inflator and the blowing device.
  • Such a lance can be called Kombilanze.
  • FIG. 1 shows an embodiment of an LD process according to the invention.
  • a converter vessel 1 is a molten metal, in this case liquid pig iron 2.
  • Gas B shown with straight arrows - inflated onto the molten pig iron.
  • injection nozzles 4 From in the upper cone of the converter vessel 1 arranged injection nozzles 4 a blowing device gas A is shown with jagged arrows - blown into the space in the converter vessel on the molten metal.
  • the temperature of gases A and B is below 50 ° C.
  • Gas B contains 10-30 vol% inert gas - nitrogen or argon, between the two can be switched - and 70-90 vol% oxygen; By changing the ratio, it is possible to react to various requirements in the procedure.
  • Gas A is dry compressed air - or a mixture of dry compressed air and technically pure oxygen - and contains 40-79% by volume of nitrogen as inert gas and 21-60% by volume of oxygen; called cold air or cold wind.
  • Inert purge gas is introduced into the molten metal via flushing elements which are not shown separately in the bottom of the converter vessel.
  • FIG. 2 shows an embodiment of an LD process according to the invention.
  • a converter vessel 1 is a molten metal, in this case liquid pig iron second From an inflator for gas B and a blowing device for gas A comprehensive lance, called combination lance 5, gas B - shown with straight arrows - inflated to the pig iron, and gas A - shown with jagged arrows - in the space in the converter vessel on the Blown molten metal.
  • the temperature of gases A and B is below 50 ° C.
  • Gas B contains 10-30 vol% inert gas - nitrogen or argon, between the two can be switched - and 70-90 vol% oxygen; By changing the ratio, it is possible to react to various requirements in the procedure.
  • Gas A is dry compressed air - or a mixture of dry compressed air and technically pure oxygen - and contains 40-79% by volume of nitrogen as inert gas and 21-60% by volume of oxygen; called cold air or cold wind.
  • Inert purge gas is introduced into the molten metal via flushing elements which are not shown separately in the bottom of the converter vessel.
  • the LD process also comprises inflation of technically pure oxygen.
  • the composition of the gases A and B and of the inert scavenging gas introduced via scavenging elements in the converter bottom is changed for different process phases, for example as in Table 1 below in the case of 5 process phases - blowing phases - in the LD process according to the invention for the production of crude steel with a low C content - ⁇ 0.05% C before tapping - cited: Table 1 process phase Gas A, vol.% Gas B, vol.% inert purge (Bubble phase) (Corresponding to injection nozzles in the top of the converter FIG.
  • Phase 1 O 2 60 O 2 90 N 2 0 to ⁇ 35% of the demand for blister oxygen N 2 40 N 2 10
  • Phase 2 O 2 40 O 2 100 N 2 35 to ⁇ 60% of the demand for blister oxygen N 2 60
  • Phase 3 O 2 30/21 (switching point at 75% 02)
  • Phase 5 O 2 21 N 2 100 * Ar Inert gas stirring step after O 2 blowing
  • Phase 3 O 2 30 O 2 80 N 2 50 to ⁇ 90% of the demand for blister oxygen N 2 70 N 2 20
  • FIG. 3 shows another embodiment of the invention, an OBM method.
  • the liquid pig iron 6 in a converter vessel 7 are introduced via bottom nozzles 8 for fresh oxygen O 2 - represented by arrows with dashed shaft -, and hydrocarbons CxHy.
  • a blowing device which is designed as a blowing lance comprising the blowing device 9, gas A - represented by jagged arrows - blown into the space in the converter vessel above the molten metal.
  • FIG. 4 shows another embodiment of the invention, a K-OBM method. From FIG. 3 the presentation differs in that there is a combination lance 10 comprising a gas B inflator and a gas A inflator. This serves to blow gas A - shown as jagged arrows - in the space in the converter vessel above the molten metal, and gas B - shown as a straight arrow - to inflate the molten metal.
  • a combination lance 10 comprising a gas B inflator and a gas A inflator.
  • This serves to blow gas A - shown as jagged arrows - in the space in the converter vessel above the molten metal, and gas B - shown as a straight arrow - to inflate the molten metal.
  • gas A - shown as jagged arrows - shown as jagged arrows - in the space in the converter vessel above the molten metal
  • gas B - shown as a straight arrow - to inflate the molten metal.
  • FIG. 5 shows an embodiment of an OBM method according to the invention, in which unlike FIG. 3 Gas A - represented by jagged arrows - is arranged in the region of the upper cone of the converter vessel 11 blowing nozzles 12 a blowing device in the space in the converter vessel above the molten metal 13 is blown.
  • Gas A - represented by jagged arrows - is arranged in the region of the upper cone of the converter vessel 11 blowing nozzles 12 a blowing device in the space in the converter vessel above the molten metal 13 is blown.
  • FIG. 6 shows another embodiment of a K-OBM method according to the invention.
  • Gas A - represented by jagged arrows - blown from arranged in the upper cone of the converter vessel 14 injection nozzles 15 a blowing device in the space in the converter vessel above the molten metal 16.
  • a lance 17 from which technically pure oxygen can be supplied for refining, or gas B - shown as a straight arrow - can be blown onto the molten metal.
  • FIG. 7 shows a further embodiment of a K-OBM method according to the invention, in which unlike FIG. 6 No injection nozzles in the region of the upper cone of the converter vessel 18 are present.
  • Embodiment 3 for an inventive OBM process or a K-OBM process for the production of crude steel with a low carbon content.
  • the composition of the gases A and B - which are supplied by the blowing and inflating devices provided for this purpose - is changed for different process phases.
  • the production of crude steel with a low C content - ⁇ 0.05% C before tapping - in the case of 5 process phases - blowing phases - is given in the following Table 3:
  • Supply of oxygen-bottom-motion O 2 (Bubble phase) (Corresponding to injection nozzles in the top of the converter FIGS. 5 or 6 , or over lance accordingly FIG. 3 or combined lance accordingly FIG.
  • Phase 1 O 2 70 O 2 100 (preferably when gas Yes 0 to ⁇ 30% of the demand for blister oxygen N 2 30 A is supplied via blowing devices - accordingly FIGS. 4 and 6 ) otherwise (if no gas A is supplied via injectors according to FIG. 7 ) O 2 90 N 2 10
  • Phase 2 O 2 60 O 2 100 (preferably when gas A is supplied via blowing devices - accordingly FIGS.

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EP13156759.6A 2013-02-26 2013-02-26 Procédé de convertisseur pour la fabrication d'acier en utilisant un gaz inerte Withdrawn EP2770067A1 (fr)

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EP13156759.6A EP2770067A1 (fr) 2013-02-26 2013-02-26 Procédé de convertisseur pour la fabrication d'acier en utilisant un gaz inerte
PCT/EP2014/053525 WO2014131722A1 (fr) 2013-02-26 2014-02-24 Procédés de convertissage destinés à la production d'acier à l'aide de gaz inerte

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109722499A (zh) * 2019-02-28 2019-05-07 攀钢集团攀枝花钢钒有限公司 转炉提钒氧氮混吹供气方法

Citations (4)

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Publication number Priority date Publication date Assignee Title
GB472397A (en) * 1935-04-03 1937-09-12 Electro Metallurg Co Process for purifying iron, steel, non-ferrous metals and ferro-alloys
GB891149A (en) * 1957-04-18 1962-03-14 Roman Rummel Method of and apparatus for carrying out metallurgical reactions
US20080236334A1 (en) * 2007-03-29 2008-10-02 M.K.N. Technologies Gmbh Melting metallurgical process for producing metal melts and transition metal-containing additive for use in this method
DE102009022208A1 (de) * 2009-05-20 2010-11-25 Messer Group Gmbh Verfahren und Vorrichtung zum Behandeln von Metallschmelzen

Patent Citations (4)

* Cited by examiner, † Cited by third party
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GB472397A (en) * 1935-04-03 1937-09-12 Electro Metallurg Co Process for purifying iron, steel, non-ferrous metals and ferro-alloys
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CN109722499A (zh) * 2019-02-28 2019-05-07 攀钢集团攀枝花钢钒有限公司 转炉提钒氧氮混吹供气方法
CN109722499B (zh) * 2019-02-28 2021-02-09 攀钢集团攀枝花钢钒有限公司 转炉提钒氧氮混吹供气方法

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