EP3034633B1 - Mixture, use of this mixture as well as method for conditioning a slag on molten metal from the processing of iron and steel in a metallurgical vessel - Google Patents

Mixture, use of this mixture as well as method for conditioning a slag on molten metal from the processing of iron and steel in a metallurgical vessel Download PDF

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Publication number
EP3034633B1
EP3034633B1 EP14198439.3A EP14198439A EP3034633B1 EP 3034633 B1 EP3034633 B1 EP 3034633B1 EP 14198439 A EP14198439 A EP 14198439A EP 3034633 B1 EP3034633 B1 EP 3034633B1
Authority
EP
European Patent Office
Prior art keywords
mixture
slag
mass
carbon
magnesia
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.)
Not-in-force
Application number
EP14198439.3A
Other languages
German (de)
French (fr)
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EP3034633A1 (en
Inventor
Wilfried Wallgram
Wilfried Eckstein
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.)
Refractory Intellectual Property GmbH and Co KG
Original Assignee
Refractory Intellectual Property GmbH and Co KG
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
Priority to EP14198439.3A priority Critical patent/EP3034633B1/en
Application filed by Refractory Intellectual Property GmbH and Co KG filed Critical Refractory Intellectual Property GmbH and Co KG
Priority to PL14198439T priority patent/PL3034633T3/en
Priority to SI201430198A priority patent/SI3034633T1/en
Priority to HUE14198439A priority patent/HUE034189T2/en
Priority to ES14198439.3T priority patent/ES2623457T3/en
Priority to CN201580059266.6A priority patent/CN107148482A/en
Priority to PCT/EP2015/071607 priority patent/WO2016096178A1/en
Priority to US15/529,344 priority patent/US20170275714A1/en
Priority to BR112017009332A priority patent/BR112017009332A2/en
Priority to RU2017112347A priority patent/RU2017112347A/en
Priority to ARP150103544A priority patent/AR102499A1/en
Priority to TW104137004A priority patent/TW201623189A/en
Publication of EP3034633A1 publication Critical patent/EP3034633A1/en
Application granted granted Critical
Publication of EP3034633B1 publication Critical patent/EP3034633B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0025—Adding carbon material
    • 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
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • 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
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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
    • 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
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C21C2007/0062—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires with introduction of alloying or treating agents under a compacted form different from a wire, e.g. briquette, pellet

Definitions

  • the invention relates to a mixture for introduction into the slag contained in a molten metal in iron and steel metallurgy, to the use of such a mixture, and to a process for conditioning an iron and steel metallurgy on a molten metal in a metallurgical vessel, for example in a converter , in an electric arc furnace or in a pan, located slag.
  • the pig iron melt is separated from unwanted components before it is cast.
  • oxygen by means of a lance on in a supplied with a basic refractory material converter inflated pig iron melt inflated.
  • the process of this inflation of oxygen on the pig iron melt is also referred to as fresh.
  • fresh iron companion especially iron companion in the form of carbon, manganese, silicon and phosphorus are oxidized by the injected oxygen and form together with added quicklime on the molten metal floating slag layer.
  • the crude steel melt is produced by the melting of scrap, pig iron, molten iron and / or sponge iron and other raw materials.
  • the slag must be specifically influenced or conditioned with regard to chemical and physical properties.
  • the basicity ie the mass or molar ratio of the basic components to the other components of the slag (which can be calculated, for example, according to the following formula: [xCaO + MgO] / [xSiO 2 + Al 2 O 3 + other components])
  • the first acidic or non-basic slag are increased to the corrosive attack of Slag on the basic delivery of the metallurgical vessel in which the molten metal is located, and thereby reduce the wear of the delivery and to increase their service life.
  • slag conditioners have a component that increases the basicity of the slag, in particular lime, dolomitic lime or dolomite.
  • slag-washing in which the slag is distributed by pivoting the converter on the tapping and Chargierseite.
  • slag-splashing is another method of care.
  • slag-foaming slag is chemically foamed by adding a carbon carrier.
  • the slag foam foamed slag is also known as “foamed slag”.
  • the foamed slag has insulating properties, so that the heat losses from the melt can be reduced and energy can be saved. Furthermore, components of the metallurgical vessel in which the molten iron is located can be protected from heat radiation by the foamed slag.
  • the object of the invention is to provide a slag conditioner by means of which the basicity and the MgO content of the slag can be increased rapidly in order to prevent the slag from attacking the refractory lining of the metallurgical vessel, in which the slag conditioner Molten metal with the slag on it is able to reduce.
  • Another object of the invention is to provide a slag conditioner which has a high reactivity while being easy to handle.
  • Another object of the invention is to provide a slag conditioner by which foaming of the slag can be achieved.
  • a further object of the invention is to provide a slag conditioner by which an increase in the iron yield of the primary metallurgical process can be achieved.
  • the mixture according to the invention or the slag conditioner according to the invention is suitable for introduction into slags on molten metals in any metallurgical vessel, but in particular for slags in converters, electric arc furnaces and ladles.
  • the proportion of Rohdolomit in the mixture according to the invention which is according to the invention in the range of 10 to 90% by mass, fulfills the invention in particular two essential tasks.
  • the raw dolomite is abruptly heated on contact with the hot slag, whereby a calcination of Rohdolomits is set in motion. This calcining leads to a foaming of the slag, so that upon introduction of the mixture according to the invention into the slag, a foamed slag is formed.
  • the calcination of the crude dolomite upon introduction of the mixture into the slag also leads to the mixture, if it is introduced into the slag in the form of pellets, spontaneously decomposing and the mixture thereby forming a large specific surface with a high reactivity.
  • MgO and CaO formed from the crude dolomite after its calcination Due to the proportion of MgO and CaO formed from the crude dolomite after its calcination, the basicity of the slag is increased. Furthermore, MgO saturation of the slag can be achieved by the proportion of MgO formed after calcination of the crude dolomite, so that the corrosive attack of the slag on the refractory lining of the metallurgical vessel holding the molten metal is reduced.
  • An advantage of the mixture according to the invention is in particular also that this MgO saturation is particularly fast attainable due to the high reactivity of the mixture.
  • the mixture according to the invention also comprises one or more further components which comprise MgO and carbon.
  • the proportion of carbon of the other components serves to increase the foaming of the slag upon introduction of the mixture into the same.
  • the carbon reacts with oxygen in the slag to form carbon oxides, in particular carbon monoxide (CO) and carbon dioxide (CO 2 ).
  • CO carbon monoxide
  • CO 2 carbon dioxide
  • the carbon of the other components of the mixture is oxidized immediately and vigorously with oxygen fractions of the slag, so that it spontaneously foams when the mixture is introduced into the slag.
  • the carbon of the mixture can react directly with oxygen of the molten metal and extract oxygen from the molten metal.
  • This extracted from the molten metal oxygen must not be removed later in additional steps by deoxidizer, such as aluminum, from the molten metal.
  • At least part of the oxygen with which the carbon introduced into the slag from the mixture according to the invention reacts originates from iron oxides in the slag, which are reduced by the carbon to metallic iron. As a result, the yield of recovered iron is increased in the overall process.
  • the proportion of MgO of the other components serves, in particular, to be able to set the basicity and the MgO saturation of the slag in a targeted manner as a function of the other components of the mixture.
  • the component of the mixture in the form of crude dolomite is crude, ie natural, essentially untreated, in particular uncalcined dolomite.
  • crude dolomite is a rock with the main mineral dolomite (CaMg (CO 3 ) 2 or CaCO 3 • MgCO 3 ).
  • Dolomite has Rohdolomit regularly to at least 90% by mass, based on the Rohdolomit on.
  • natural impurities may be present, for example in the form of Fe 2 O 3 , SiO 2 or Al 2 O 3 .
  • a crude dolomite having a proportion of dolomite of at least 90% by mass, based on the crude dolomite, in particular having at least 91, 92, 93, 94, 95 or 96% dolomite.
  • Rohdolomit can be present in the mixture according to the invention in a proportion in the range of 10 to 90% by mass, that is, for example, in a proportion of at least 10, 11, 12, 13, 14 or 15% by mass.
  • crude dolomite can be present in the mixture according to the invention in a proportion of at most 90, 80, 70, 60, 55, 50, 45, 40, 35, 30 or 25 mass%.
  • the at least one other component comprising the mixture besides crude dolomite may be, for example, one or more of magnesite, magnesia, sintered magnesia, fused magnesia, graphite, coke or one or more carbides, for example aluminum carbide.
  • one or more of the abovementioned components are present in the mixture according to the invention, which comprise MgO but no carbon (such as magnesite curd, Sintered magnesia or fused magnesia) there is at least one other component comprising carbon (such as at least one of magnesia, graphite, coke or at least one carbide).
  • the mixture comprises carbon, but not MgO (such as graphite, coke or at least one carbide), at least one of the aforementioned components comprising MgO (such as magnesite, sintered magnesia or fused magnesia).
  • MgO such as graphite, coke or at least one carbide
  • MgO such as magnesite, sintered magnesia or fused magnesia
  • the further component is in the form of magnesium carbon and optionally at least in the form of another of the aforementioned components.
  • the other components are present in the form of magnesium carbon and in the form of magnesite-curd.
  • Magnesium oxide is a so-called magnesia product, also known as magnesia or MgO-C, characterized by a magnesia (MgO) granule linked together by a carbon bond.
  • MgO magnesia
  • magnesium oxide is present in the form of used magnesium carbonate products, ie so-called magnesia carbon outbreaks.
  • Such magnesium oxide outbreaks are magnesia petroleum products which have been used in the steel industry, in particular as wear linings of oxygen blowing converters, in electric arc furnaces or in pans. insofar Accordingly, recycled magnesia products may be partly, substantially or exclusively present as magnesium oxide in the mixture according to the invention.
  • the invention also relates to the use of recycled magnesia products as raw material for the mixture according to the invention or the use of such recycled magnesia products as a component of a slag conditioner according to the invention.
  • the use of magnesium carbon as a carbon carrier in the mixture according to the invention can be particularly advantageous insofar as magnesium oxide, in particular as far as it is present as an outbreak, can approximate the composition of the refractory lining of a metallurgical melting vessel and therefore in the formation of a Foam slag can especially effectively contribute to the care of the delivery by the foamed slag.
  • Magnesia chew is magnesite burnt by caustics, sometimes called chewing magnesite or caustic magnesia. Magnesite chew is known to be obtained by caustic burning of magnesite (MgCO 3 ), ie by burning magnesite at low temperatures.
  • MgCO 3 magnesite
  • An advantage of the use of magnesite cereal in the mixture according to the invention is in particular that it is highly reactive, which is why, when introduced into a slag, it liberates MgO very rapidly and the increase in the basicity of the slag and its MgO saturation can therefore be achieved particularly quickly.
  • the mixture according to the invention has particularly advantageous properties, in particular with regard to their reactivity and their action as a foaming agent for the slag, as far as the mixture comprises the further components in the form of magnesia carbon and magnesite-cerium in the following proportions by mass: magnesium oxide: 10 to 50% by mass; Magnesite malt: 10 to 50% by mass. It can be provided according to the invention that only one of the aforementioned components is present in the above-mentioned mass fractions in the mixture.
  • magnesium carbon may be present in proportions of at least 10, 15, 20, 25, 30 or 35% by weight in the mixture.
  • magnesium oxide may be present in the mixture, for example, in proportions of at most 45 or 40% by mass.
  • magnesite malt may be present in proportions of at least 10, 15, 20, 25, 30 or 35% by weight in the mixture. Furthermore, magnesite malt may for example be present in proportions of at most 50 or 45% by weight in the mixture.
  • the mixture is present in a relatively small particle size, for example at least 50% by mass, 60% by mass, 70% by mass, 80% by mass, 90% by mass or even 100% by mass in one Grain size less than 5 mm.
  • Rohdolomit is present at least 80% by mass, so for example, at least 90% by mass or 100% by mass in a particle size less than 5 mm.
  • the other components in particular if they are present in the form of magnesium oxide and magnesite chew, may preferably be present in at least 80% by mass, ie for example at least 90% by mass or 100% by mass in a particle size of less than 1 mm.
  • the mixture according to the invention having this very small mean particle size, it is possible to achieve a particularly good and uniform distribution and, in particular, a rapid dissolution of the mixture in the slag.
  • the mixture according to the invention In order to be able to achieve good handling of the mixture according to the invention in spite of this small particle size of the mixture, it can be provided to provide the mixture in compacted or pressed form, for example in the form of pellets. In order to provide the mixture in the form of pellets, it can be provided that a mixture according to the invention, which in particular can have the previously described particle size distribution, is pressed into pellets without additions of additives.
  • these pellets may have an almond-shaped, rod-shaped or spherical shape, for example with a maximum length of, for example, 50 mm, 40 mm or 30 mm.
  • the pellets may also have, for example, a minimum diameter of 5, 10, 15, 20 or 25 mm.
  • Pellets of an appropriate size are easy to handle, but at the same time so small that they quickly disintegrate there after entering a slag and the benefits of the invention, small particle size distribution can quickly come to fruition there.
  • the spontaneous calcination of the crude dolomite upon introduction of the mixture into the slag causes the pellets to spontaneously disintegrate upon introduction into the slag, promptly disregarding a small grain size or grain size of the mixture having a high surface area and high reactivity to unfold.
  • the mixture may have a proportion of magnesium carbonate (MgCO 3 ), for example in the range of 5 to 30% by mass, for example, a proportion of at least 6, 7, 8 or 9% by mass and, for example, in a proportion of at most 25, 20 or 15 mass%.
  • the proportion of magnesium carbonate in the mixture can be predominantly or completely present as a constituent of the crude dolomite.
  • the proportion of calcium carbonate (CaCO 3 ) in the mixture may, for example, be in the range of 5 to 35% by mass, that is to say for example at least 6, 7, 8, 9, 10% by mass and, for example, also at most 30, 25, 20 or 15 mass%.
  • the proportion of calcium carbonate in the mixture may be predominantly or completely present as part of the crude dolomite.
  • the proportion of magnesia (MgO) in the mixture may, for example, be in the range from 20 to 60% by mass, for example also at least 25, 30, 35, 40 or 45% by mass and for example also at most 55 or 50% by mass. %.
  • the magnesia can be present, for example, in particular in the components magnesia carbon and magnesite chew.
  • Carbon may be present in the mixture according to the invention, for example in a proportion in the range of 3 to 15% by mass, ie, for example, in a proportion of at least 4, 5 or 6% by mass and, for example, in a proportion of at most 14, 13, 12 , 11 or 10% by mass. Carbon may be predominantly or completely present in the mixture in the form of magnesium carbon in the mixture.
  • Calcium oxide (CaO) which may for example be incorporated into the mixture as a secondary constituent of magnesite chew, can be present in proportions in the range of 0 to 40% by mass in the mixture, for example also in proportions of at least 5, 10 or 15% by weight. % and, for example, also in proportions of at most 35, 30, 25 or 20% by mass.
  • the mixture can react very sensitively to other components and substances.
  • the mixture according to the invention contains, in addition to components in the form of raw magnesite, magnesium carbon and magnesite chew, fractions of other components in a proportion of less than 10% by mass, ie, for example, in a proportion of less than 9, 8, 7, 6, 5, 4, 3, 2 or 1 mass%.
  • the mixture in addition to the aforementioned substances MgCO 3 , CaCO 3 , MgO, C, CaO, SiO 2 , Fe 2 O 3 , Al 2 O 3 , H 2 O, P 2 O 5 , in particular in the aforementioned Mass fractions, other substances only in a proportion of less than 10% by mass, that is, for example, in a proportion of less than 9, 8, 7, 6, 5, 4, 3, 2 or 1% by mass.
  • a binder In order to make the mixture according to the invention available in the form of pellets, it can be provided to make the mixture with a binder before it is pressed into pellets.
  • a sulphate binder may be provided, for example an Epsom salt solution.
  • the concentration of epsom salt in the epsom salt solution may be in the range of 0.1 to 0.3 mass%. It can be provided that the mixture with a proportion of binder in the range of 5 to 15 mass%, based on the mixture without the binder, is made.
  • the mixture also comprises one or more temporary binders, for example one or more of the following temporary binders: glucose, starch, one or more silicate binders or one or more phosphatic binders.
  • the mixture may, as described herein, so for example, in compacted or compressed form, for example in the form of pellets are provided.
  • the mixture can be mixed with one or more of the binders described herein and then pressed into pellets, in particular with the dimensions described herein.
  • the provided mixture for example in the form of pellets, is added to the slag and sinks into it so that it can unfold its effect there according to the invention.
  • the mixture according to the invention is fundamentally suitable as a slag conditioner for slags on a molten metal in any metallurgical vessel, for example for molten metals in converters, electric arc furnaces or ladles.
  • the mixture according to the invention is particularly preferably used as a slag conditioner for slags on molten metals which are located in a metallurgical vessel with a basic feed, ie in particular with a feed based on at least one of the following materials: magnesia, magnesia-carbon, doloma or dolomite. Carbon.
  • the invention furthermore relates to the use of a mixture according to the invention described herein for conditioning a slag present in iron and steel metallurgy on a molten metal in a metallurgical vessel.
  • the crude dolomite used had a proportion of dolomite of more than 95% by mass, based on the crude dolomite.
  • Al 2 O 3 , Fe 2 O 3 and SiO 2 were present as secondary constituents.
  • magnesia carbon component was excavated material in the form of recycled magnesia petroleum products.
  • this component had a carbon content of 28% by mass, based on the total mass of the components.
  • the crude dolomite was present in a particle size of less than 5 mm and the components magnesia carbon and magnesite cereal in a particle size of less than 1 mm.
  • the mixture was mixed with 10% binder in the form of Epsom salt based on the mass of the mixture without the binder and pressed into almond-shaped pellets having a thickness of about 15 mm and a length of about 30 mm.
  • pellets were then dried at about 300 ° C and, after cooling in this form, made available as a slag conditioner.

Description

Die Erfindung betrifft eine Mischung zur Einbringung in die bei der Eisen- und Stahlmetallurgie auf einer Metallschmelze befindliche Schlacke, die Verwendung einer solchen Mischung sowie ein Verfahren zur Konditionierung einer bei der Eisen- und Stahlmetallurgie auf einer Metallschmelze in einem metallurgischen Gefäß, beispielsweise in einem Konverter, in einem Elektrolichtbogenofen oder in einer Pfanne, befindlichen Schlacke.The invention relates to a mixture for introduction into the slag contained in a molten metal in iron and steel metallurgy, to the use of such a mixture, and to a process for conditioning an iron and steel metallurgy on a molten metal in a metallurgical vessel, for example in a converter , in an electric arc furnace or in a pan, located slag.

Bei der Stahl- und Eisenmetallurgie wird die Roheisenschmelze vor dem Vergießen von unerwünschten Bestandteilen getrennt.In steel and iron metallurgy, the pig iron melt is separated from unwanted components before it is cast.

Soweit ein Konverter verwendet wird, wird hierzu bei dem heutzutage am weitesten verbreiteten LD-Verfahren Sauerstoff mittels einer Lanze auf die in einem mit einem basischen feuerfesten Material zugestellten Konverter befindliche Roheisenschmelze aufgeblasen. Der Vorgang dieses Aufblasens von Sauerstoff auf die Roheisenschmelze wird auch als Frischen bezeichnet. Beim Frischen werden Eisenbegleiter, insbesondere Eisenbegleiter in Form von Kohlenstoff, Mangan, Silizium und Phosphor durch den eingeblasenen Sauerstoff oxidiert und bilden zusammen mit zugesetztem gebranntem Kalk eine auf der Metallschmelze aufschwimmende Schlackenschicht.As far as a converter is used, this is in the most common LD method today, oxygen by means of a lance on in a supplied with a basic refractory material converter inflated pig iron melt inflated. The process of this inflation of oxygen on the pig iron melt is also referred to as fresh. When fresh iron companion, especially iron companion in the form of carbon, manganese, silicon and phosphorus are oxidized by the injected oxygen and form together with added quicklime on the molten metal floating slag layer.

Im Elektrolichtbogenofen wird die Rohstahlschmelze durch das Einschmelzen von Schrott, Roheisen, Flüssigeisen und/oder Eisenschwamm und anderer Rohstoffe erzeugt.In the electric arc furnace, the crude steel melt is produced by the melting of scrap, pig iron, molten iron and / or sponge iron and other raw materials.

Nachdem die im primärmetallurgischen Aggregat gefrischte Metallschmelze die gewünschten Eigenschaften aufweist, wird diese zur sekundärmetallurgischen Behandlung durch den Abstichkanal in die Pfanne abgestochen.After the reflowed in the primary metallurgical aggregate molten metal has the desired properties, this is tapped for secondary metallurgical treatment through the tapping channel in the pan.

Die Schlacke muss hinsichtlich chemischer und physikalischer Eigenschaften gezielt beeinflusst beziehungsweise konditioniert werden.The slag must be specifically influenced or conditioned with regard to chemical and physical properties.

Zur Konditionierung der Schlacke ist es bekannt, die Schlacke mit sogenannten Schlackenkonditionierern zu versehen, um die Eigenschaften der Schlacke verändern zu können.To condition the slag, it is known to provide the slag with so-called slag conditioners in order to be able to change the properties of the slag.

So muss die Basizität, also das Massen- oder Molverhältnis der basischen Komponenten zu den anderen Komponenten der Schlacke (das beispielsweise nach der folgenden Formel berechnet werden kann: [xCaO+MgO] / [xSiO2+Al2O3+weitere Komponenten]), der zunächst sauren beziehungsweise nicht-basischen Schlacke erhöht werden, um den korrosiven Angriff der Schlacke auf die basische Zustellung des metallurgischen Gefäßes, in dem sich die Metallschmelze befindet, zu reduzieren und dadurch den Verschleiß der Zustellung zu vermindern und deren Lebensdauer zu erhöhen. Hierzu weisen Schlackenkonditionierer eine die Basizität der Schlacke erhöhende Komponente auf, insbesondere Kalk, dolomitischen Kalk oder Dolomit.Thus, the basicity, ie the mass or molar ratio of the basic components to the other components of the slag (which can be calculated, for example, according to the following formula: [xCaO + MgO] / [xSiO 2 + Al 2 O 3 + other components]) , the first acidic or non-basic slag are increased to the corrosive attack of Slag on the basic delivery of the metallurgical vessel in which the molten metal is located, and thereby reduce the wear of the delivery and to increase their service life. For this purpose, slag conditioners have a component that increases the basicity of the slag, in particular lime, dolomitic lime or dolomite.

Zusätzlich ist es sinnvoll, den Gehalt an MgO in der Schlacke durch Zugabe eines Schlackenkonditionierers so einzustellen, dass dieser im Bereich der Sättigung an MgO in der Schlacke liegt und dadurch ein korrosiver Angriff der Schlacke auf die Zustellung vermindert wird.In addition, it is useful to adjust the content of MgO in the slag by adding a slag conditioner so that it is in the range of saturation of MgO in the slag and thereby a corrosive attack of the slag is reduced to the delivery.

Ferner kann es während des Abstichs oder nach dem Abstich gewünscht sein, die nach dem Abstich im Konverter verbliebene Schlacke gut auf die feuerfeste Zustellung des Konverters auftragen zu können. Durch diese aufgetragene Schlackenschicht kann ein korrosiver Angriff einer Metallschmelze auf die Zustellung des Konverters reduziert werden. Der Vorgang des Auftragens der Schlacke auf den Konverter wird auch als "Pflege" des Konverters bezeichnet. Bei den bekannten Methoden zur Pflege des Konverters handelt es sich zum einen um das sogenannte "Slag-Washing", bei dem die Schlacke durch Schwenken des Konverters auf die Abstich- und Chargierseite verteilt wird. Eine weitere Pflegemethode ist das sogenannte "Slag-Splashing", bei dem die Schlacke mit Hilfe eines Stickstoff-Gasstroms einer Lanze mechanisch verspritzt wird. Schließlich wird beim sogenannten "Slag-Foaming" Schlacke durch Zugabe eines Kohlenstoffträgers chemisch aufgeschäumt. Die beim Slag-Foaming aufgeschäumt Schlacke wird auch als "Schaumschlacke" bezeichnet.Furthermore, it may be desired during tapping or after tapping to be able to apply the slag remaining in the converter after tapping well on the refractory lining of the converter. By this applied slag layer, a corrosive attack of a molten metal can be reduced to the delivery of the converter. The process of applying the slag to the converter is also referred to as "maintenance" of the converter. In the known methods for the maintenance of the converter is on the one hand to the so-called "slag-washing", in which the slag is distributed by pivoting the converter on the tapping and Chargierseite. Another method of care is the so-called "slag-splashing", in which the slag is mechanically sprayed with the aid of a nitrogen gas stream of a lance. Finally, in the so-called "slag-foaming" slag is chemically foamed by adding a carbon carrier. The slag foam foamed slag is also known as "foamed slag".

Neben der Pflege des Konverters durch die Schaumschlacke, hat diese weitere vorteilhafte Wirkungen. So weist die Schaumschlacke isolierende Eigenschaften auf, so dass die Wärmeverluste aus der Schmelze vermindert und Energie gespart werden kann. Ferner können Komponenten des metallurgischen Gefäßes, in dem sich die Eisenschmelze befindet, durch die Schaumschlacke vor Wärmestrahlung geschützt werden.In addition to the care of the converter by the foam slag, this has further beneficial effects. Thus, the foamed slag has insulating properties, so that the heat losses from the melt can be reduced and energy can be saved. Furthermore, components of the metallurgical vessel in which the molten iron is located can be protected from heat radiation by the foamed slag.

Um im Elektrolichtbogenofen eine Schaumschlacke zu erzeugen, wird zusätzlich in die Schlacke eingeblasener Kohlenstoff mittels Sauerstoff zu Kohlenmonoxid verbrannt und das zum Schäumen notwendige Kohlenmonoxidgas derart bereitgestellt. Im Fall des Einschmelzprozesses im Elektrolichtbogenofen ist ein Aufschäumen der Schlackenschicht von Bedeutung, da diese durch Volumenvergrößerung die Lichtbogen abschirmt, Strahlungsverluste auf die Ofenwand vermindert, die Energieübertragung auf die Schmelze verbessert und dadurch ebenfalls Energie gespart wird.In order to produce a foamed slag in the electric arc furnace, additionally injected into the slag carbon is burned by means of oxygen to carbon monoxide and provided the necessary for foaming carbon monoxide gas. In the case of the smelting process in the electric arc furnace, foaming of the slag layer is important, since this shields the arc by increasing the volume, reduces radiation losses on the furnace wall, improves the energy transfer to the melt and thus energy is also saved.

Um die Reaktivität des Schlackenkonditionierers bei seinem Einbringen in die Schlacke zu erhöhen, wäre es grundsätzlich wünschenswert, die Mischung möglichst feinkörnig zur Verfügung zu stellen und in die Schlacke einzubringen. Daher ist es bekannt, Schlackenkonditionierer staubfein zur Verfügung zu stellen, so dass diese aufgrund ihrer hohen spezifischen Oberfläche eine hohe Reaktivität aufweisen. Nachteilig an einem solchen staubfein zur Verfügung gestellten Schlackenkonditionierer ist jedoch insbesondere das komplizierte Handling eines solchen staubfeinen Schlackenkonditionierers. Daher ist es aus dem Stand der Technik bekannt, einen staubfeinen Schlackenkonditionierer zunächst zu Pellets zu kompaktieren und in dieser Form in die Schlacke einzubringen. Nachteilig an solchen zu Pellets gepressten Schlackenkonditionierern kann es jedoch sein, dass sich diese in der Schlacke nur mit einer Zeitverzögerung zersetzen und die Reaktivität des Schlackenkonditionierers hierdurch reduziert wird.In order to increase the reactivity of the slag conditioner when it is introduced into the slag, it would be fundamentally desirable to provide the mixture as fine-grained as possible and to introduce it into the slag. Therefore, it is known to provide slag conditioners dust-fine so that they have a high reactivity due to their high specific surface area. However, a disadvantage of such a dust conditioner made available slag conditioner is particularly the complicated handling of such a dusty slag conditioner. Therefore, it is known from the prior art to first compact a dusty slag conditioner to pellets and to introduce in this form in the slag. A disadvantage of such pelletized slag conditioners, however, may be that these decompose in the slag only with a time delay and the reactivity of the slag conditioner is thereby reduced.

Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, einen Schlackenkonditionierer zur Verfügung zu stellen, durch den die Basizität und der MgO-Gehalt der Schlacke schnell erhöht werden können, um den Angriff der Schlacke auf die feuerfeste Zustellung des metallurgischen Gefäßes, in dem sich die Metallschmelze mit der darauf befindlichen Schlacke befindet, reduzieren zu können.Against this background, the object of the invention is to provide a slag conditioner by means of which the basicity and the MgO content of the slag can be increased rapidly in order to prevent the slag from attacking the refractory lining of the metallurgical vessel, in which the slag conditioner Molten metal with the slag on it is able to reduce.

Eine weitere Aufgabe der Erfindung besteht darin, einen Schlackenkonditionierer zur Verfügung zu stellen, der eine hohe Reaktivität bei einer gleichzeitig guten Handhabbarkeit aufweist.Another object of the invention is to provide a slag conditioner which has a high reactivity while being easy to handle.

Eine weitere Aufgabe der Erfindung besteht darin, einen Schlackenkonditionierer zur Verfügung zu stellen, durch den ein Aufschäumen der Schlacke erreicht werden kann.Another object of the invention is to provide a slag conditioner by which foaming of the slag can be achieved.

Schließlich liegt eine weitere Aufgabe der Erfindung darin, einen Schlackenkonditionierer zur Verfügung zu stellen, durch den eine Erhöhung der Eisenausbringung des primärmetallurgischen Prozesses erreicht werden kann.Finally, a further object of the invention is to provide a slag conditioner by which an increase in the iron yield of the primary metallurgical process can be achieved.

Zur Lösung dieser Aufgabe wird erfindungsgemäß zur Verfügung gestellt eine Mischung beziehungsweise ein Schlackenkonditionierer zur Einbringung in die bei der Eisen- und Stahlmetallurgie auf einer Metallschmelze befindliche Schlacke, die die folgenden Komponenten in den folgenden Masseanteilen umfasst:

  • Rohdolomit im Bereich von 10 bis 90 Masse-%;
  • eine oder mehrere weitere Komponenten, die wenigstens die folgenden Bestandteile umfassen: MgO und Kohlenstoff, im Bereich von 90 bis 10 Masse-%; sowie die weiteren Merkmale nach Anspruch 1.
In order to achieve this object, according to the invention, a mixture or a slag conditioner is provided for introduction into the slag on a molten metal in iron and steel metallurgy, which comprises the following components in the following proportions by mass:
  • Crude dolomite in the range of 10 to 90% by mass;
  • one or more further components comprising at least the following constituents: MgO and carbon, in the range of 90 to 10% by mass; and the further features according to claim 1.

Die erfindungsgemäße Mischung beziehungsweise der erfindungsgemäße Schlackenkonditionierer eignet sich zum Einbringen in Schlacken auf Metallschmelzen in einem beliebigen metallurgischen Gefäß, insbesondere jedoch für Schlacken in Konvertern, Elektrolichtbogenöfen und Pfannen.The mixture according to the invention or the slag conditioner according to the invention is suitable for introduction into slags on molten metals in any metallurgical vessel, but in particular for slags in converters, electric arc furnaces and ladles.

Sämtliche der hier gemachten Angaben in % sind Angaben in Masse-%, jeweils bezogen auf die Gesamtmasse der erfindungsgemäßen Mischung, soweit in Einzelfall nicht anders angegeben.All of the information given here in% are in% by mass, in each case based on the total mass of the mixture according to the invention, unless specified otherwise in individual cases.

Der Anteil an Rohdolomit in der erfindungsgemäßen Mischung, der erfindungsgemäß im Bereich von 10 bis 90 Masse-% liegt, erfüllt erfindungsgemäß insbesondere zwei wesentliche Aufgaben. Zum einen wird der Rohdolomit bei Kontakt mit der heißen Schlacke schlagartig erhitzt, wodurch eine Kalzinierung des Rohdolomits in Gang gesetzt wird. Diese Kalzinierung führt ein Aufschäumen der Schlacke herbei, so dass bei Einbringen der erfindungsgemäßen Mischung in die Schlacke eine Schaumschlacke gebildet wird. Zum weiteren führt die Kalzinierung des Rohdolomits beim Einbringen der Mischung in die Schlacke jedoch auch dazu, dass die Mischung, soweit diese in Form von Pellets in die Schlacke eingebracht wird, spontan zerfällt und die Mischung hierdurch eine große spezifische Oberfläche mit einer hohen Reaktivität ausbildet. Hierdurch ermöglicht es die erfindungsgemäße Mischung, dass diese gleichzeitig sowohl in Form von Pellets, also mit einer guten Handhabbarkeit, als auch mit einer hohen Reaktivität zur Verfügung gestellt wird.The proportion of Rohdolomit in the mixture according to the invention, which is according to the invention in the range of 10 to 90% by mass, fulfills the invention in particular two essential tasks. On the one hand, the raw dolomite is abruptly heated on contact with the hot slag, whereby a calcination of Rohdolomits is set in motion. This calcining leads to a foaming of the slag, so that upon introduction of the mixture according to the invention into the slag, a foamed slag is formed. On the other hand, the calcination of the crude dolomite upon introduction of the mixture into the slag also leads to the mixture, if it is introduced into the slag in the form of pellets, spontaneously decomposing and the mixture thereby forming a large specific surface with a high reactivity. This makes it possible for the mixture according to the invention that these both simultaneously in the form of pellets, so with good handling, as well as with a high reactivity is provided.

Durch die aus dem Rohdolomit nach seiner Kalzinierung gebildeten Anteile an MgO und CaO wird die Basizität der Schlacke erhöht. Ferner kann durch den nach Kalzinierung des Rohdolomits gebildeten Anteil an MgO eine MgO-Sättigung der Schlacke erreicht werden, so dass der korrosive Angriff der Schlacke auf die feuerfeste Zustellung des die Metallschmelze haltenden metallurgischen Gefäßes reduziert wird. Vorteilhaft an der erfindungsgemäßen Mischung ist dabei insbesondere auch, dass diese MgO-Sättigung aufgrund der hohen Reaktivität der Mischung besonders schnell erreichbar ist.Due to the proportion of MgO and CaO formed from the crude dolomite after its calcination, the basicity of the slag is increased. Furthermore, MgO saturation of the slag can be achieved by the proportion of MgO formed after calcination of the crude dolomite, so that the corrosive attack of the slag on the refractory lining of the metallurgical vessel holding the molten metal is reduced. An advantage of the mixture according to the invention is in particular also that this MgO saturation is particularly fast attainable due to the high reactivity of the mixture.

Neben Rohdolomit umfasst die erfindungsgemäße Mischung noch eine oder mehrere weitere Komponenten, die MgO und Kohlenstoff umfassen.In addition to crude dolomite, the mixture according to the invention also comprises one or more further components which comprise MgO and carbon.

Der Anteil an Kohlenstoff der weiteren Komponenten dient dazu, das Aufschäumen der Schlacke bei Einbringen der Mischung in dieselbe zu verstärken. Dabei reagiert der Kohlenstoff bei Eingabe der Mischung in die Schlacke mit in der Schlacke befindlichem Sauerstoff zu Kohlenstoffoxiden, insbesondere zu Kohlenstoffmonoxid (CO) und Kohlenstoffdioxid (CO2). Bei Einbringen der Mischung in die Schlacke oxidiert der Kohlenstoff der weiteren Komponenten der Mischung umgehend und heftig mit Sauerstoffanteilen der Schlacke, so dass diese bei Einbringen der Mischung in die Schlacke spontan aufschäumt.The proportion of carbon of the other components serves to increase the foaming of the slag upon introduction of the mixture into the same. When the mixture enters the slag, the carbon reacts with oxygen in the slag to form carbon oxides, in particular carbon monoxide (CO) and carbon dioxide (CO 2 ). When the mixture is introduced into the slag, the carbon of the other components of the mixture is oxidized immediately and vigorously with oxygen fractions of the slag, so that it spontaneously foams when the mixture is introduced into the slag.

Sowohl durch die Kalzinierung des Rohdolomits beim Einbringen in eine Schlacke als auch durch die Reaktion des Kohlenstoffanteils der Mischung beim Einbringen in die Schlacke wird daher eine Schaumbildung der Schlacke provoziert, wodurch die Schlacke, wie beim Slag-Foaming, in die Höhe steigt und die feuerfeste Zustellung des metallurgischen Gefäßes bedeckt. Im Elektrolichtbogenofen wird durch das erhöhte Volumen der aufgeschäumten Schlacke die Strahlung der Lichtbögen teilweise oder vollständig gegenüber der Ofenwand abgeschirmt. Durch den erhöhten Gehalt an MgO erhält die Schlacke gleichzeitig die notwendige Viskosität um auch während und nach dem Aufschäumen an der Wand haften zu bleiben.Both by the calcination of Rohdolomits when introducing into a slag and by the reaction of the carbon content of the mixture When introduced into the slag, therefore, a foaming of the slag is provoked, whereby the slag, as in slag-foaming, rises in height and covers the refractory lining of the metallurgical vessel. In the electric arc furnace, the radiation of the arcs is partially or completely shielded from the furnace wall by the increased volume of the foamed slag. Due to the increased content of MgO, the slag simultaneously obtains the necessary viscosity in order to adhere to the wall during and after foaming.

Soweit die Mischung in unmittelbaren Kontakt mit der Metallschmelze tritt, beispielsweise weil es durch einen Spüler zu einer Öffnung der Schlackenschicht kommt, kann der Kohlenstoff der Mischung direkt mit Sauerstoff der Metallschmelze reagieren und der Metallschmelze Sauerstoff entziehen. Dieser der Metallschmelze entzogene Sauerstoff muss später nicht mehr in zusätzlichen Schritten durch Desoxidationsmittel, beispielsweise Aluminium, aus der Metallschmelze entfernt werden.As far as the mixture comes into direct contact with the molten metal, for example because it comes through a spinner to an opening of the slag layer, the carbon of the mixture can react directly with oxygen of the molten metal and extract oxygen from the molten metal. This extracted from the molten metal oxygen must not be removed later in additional steps by deoxidizer, such as aluminum, from the molten metal.

Zumindest ein Teil des Sauerstoffs, mit dem der aus der erfindungsgemäßen Mischung in die Schlacke eingebrachte Kohlenstoff reagiert, stammt aus Eisenoxiden in der Schlacke, die durch den Kohlenstoff zu metallischem Eisen reduziert werden. Hierdurch wird das Ausbringen an gewonnenem Eisen im Gesamtprozess erhöht.At least part of the oxygen with which the carbon introduced into the slag from the mixture according to the invention reacts originates from iron oxides in the slag, which are reduced by the carbon to metallic iron. As a result, the yield of recovered iron is increased in the overall process.

Durch den Anteil an Kohlenstoff in der Mischung kann somit zum einen ein Aufschäumen der Schlacke erreicht werden. Zum weiteren kann das Ausbringen an gewonnenem Eisen im Gesamtprozess erhöht werden.Due to the proportion of carbon in the mixture can thus be achieved on the one foaming of the slag. Furthermore, the yield of recovered iron in the overall process can be increased.

Der Anteil an MgO der weiteren Komponenten dient insbesondere dazu, die Basizität und die MgO-Sättigung der Schlacke in Abhängigkeit von den übrigen Komponenten der Mischung gezielt einstellen zu können.The proportion of MgO of the other components serves, in particular, to be able to set the basicity and the MgO saturation of the slag in a targeted manner as a function of the other components of the mixture.

Bei der Komponente der Mischung in Form von Rohdolomit handelt es sich um rohen, also natürlichen, im Wesentlichen unbehandelten, insbesondere unkalzinierten Dolomit. Bei Rohdolomit handelt es sich bekanntermaßen um ein Gestein mit dem Hauptmineral Dolomit (CaMg(CO3)2 beziehungsweise CaCO3 • MgCO3). Dolomit weist Rohdolomit regelmäßig zu wenigstens 90 Masse-%, bezogen auf den Rohdolomit, auf. Daneben können natürliche Verunreinigungen vorliegen, beispielsweise in Form von Fe2O3, SiO2 oder Al2O3. Bevorzugt wird erfindungsgemäß ein Rohdolomit mit einem Anteil an Dolomit von wenigstens 90 Masse-%, bezogen auf den Rohdolomit, insbesondere mit wenigstens 91, 92, 93, 94, 95 oder 96 % Dolomit verwendet.The component of the mixture in the form of crude dolomite is crude, ie natural, essentially untreated, in particular uncalcined dolomite. As is well known, crude dolomite is a rock with the main mineral dolomite (CaMg (CO 3 ) 2 or CaCO 3 • MgCO 3 ). Dolomite has Rohdolomit regularly to at least 90% by mass, based on the Rohdolomit on. In addition, natural impurities may be present, for example in the form of Fe 2 O 3 , SiO 2 or Al 2 O 3 . According to the invention, preference is given to using a crude dolomite having a proportion of dolomite of at least 90% by mass, based on the crude dolomite, in particular having at least 91, 92, 93, 94, 95 or 96% dolomite.

Rohdolomit kann in der erfindungsgemäßen Mischung in einem Anteil im Bereich von 10 bis 90 Masse-% vorliegen, also beispielsweise auch in einem Anteil von wenigstens 10, 11, 12, 13, 14 oder 15 Masse-%. Beispielsweise kann Rohdolomit in der erfindungsgemäßen Mischung in einem Anteil von höchstens 90, 80, 70, 60, 55, 50, 45, 40, 35, 30 oder 25 Masse-% vorliegen.Rohdolomit can be present in the mixture according to the invention in a proportion in the range of 10 to 90% by mass, that is, for example, in a proportion of at least 10, 11, 12, 13, 14 or 15% by mass. For example, crude dolomite can be present in the mixture according to the invention in a proportion of at most 90, 80, 70, 60, 55, 50, 45, 40, 35, 30 or 25 mass%.

Bei der wenigstens einen weiteren Komponenten, die die Mischung neben Rohdolomit umfasst, kann es sich beispielsweise um eine oder mehrere der folgenden Komponenten handeln: Magnesitkauster, Magnesiakohlenstoff, Sintermagnesia, Schmelzmagnesia, Graphit, Koks oder ein oder mehrere Carbide, beispielsweise Aluminiumcarbid. Soweit in der erfindungsgemäßen Mischung eine oder mehrere der vorgenannten Komponenten vorliegen, die MgO, jedoch keinen Kohlenstoff umfassen (wie Magnesitkauster, Sintermagnesia oder Schmelzmagnesia) liegt wenigstens noch eine weitere Komponente vor, die Kohlenstoff umfasst (wie beispielsweise wenigstens eine der Komponenten Magnesiakohlenstoff, Graphit, Koks oder wenigstens ein Carbid). Entsprechend weist die Mischung, soweit eine oder mehrere der vorgenannten Komponenten vorliegen, die Kohlenstoff, jedoch kein MgO umfassen (wie Graphit, Koks oder wenigstens ein Carbid) wenigstens eine weitere der vorgenannten Komponenten auf, die MgO umfasst (wie Magnesitkauster, Sintermagnesia oder Schmelzmagnesia).The at least one other component comprising the mixture besides crude dolomite may be, for example, one or more of magnesite, magnesia, sintered magnesia, fused magnesia, graphite, coke or one or more carbides, for example aluminum carbide. Insofar as one or more of the abovementioned components are present in the mixture according to the invention, which comprise MgO but no carbon (such as magnesite curd, Sintered magnesia or fused magnesia) there is at least one other component comprising carbon (such as at least one of magnesia, graphite, coke or at least one carbide). Accordingly, as far as one or more of the aforesaid components are present, the mixture comprises carbon, but not MgO (such as graphite, coke or at least one carbide), at least one of the aforementioned components comprising MgO (such as magnesite, sintered magnesia or fused magnesia). ,

Nach einer bevorzugten Ausführungsform liegt die weitere Komponente in Form von Magnesiakohlenstoff und gegebenenfalls wenigstens in Form einer weiteren der vorgenannten Komponenten vor.According to a preferred embodiment, the further component is in the form of magnesium carbon and optionally at least in the form of another of the aforementioned components.

In einer besonders bevorzugten Ausführungsform liegen die weiteren Komponenten in Form von Magnesiakohlenstoff und in Form von Magnesitkauster vor.In a particularly preferred embodiment, the other components are present in the form of magnesium carbon and in the form of magnesite-curd.

Bei Magnesiakohlenstoff handelt es sich um sogenannte Magnesiakohlenstofferzeugnisse, die auch als Magnesiakohlenstoffsteine oder MgO-C-Steine bezeichnet werden und die gekennzeichnet sind durch eine Körner aus Magnesia (MgO), die über eine Kohlenstoffbindung miteinander verbunden sind. Nach einer besonders bevorzugten Ausführungsform liegt Magnesiakohlenstoff in Form von gebrauchten Magnesiakohlenstofferzeugnissen vor, also sogenannten Magnesiakohlenstoffausbruch. Bei solchem Magnesiakohlenstoffausbruch handelt es sich um Magnesiakohlenstofferzeugnisse, die in der Stahlindustrie benutzt worden sind, insbesondere als Verschleißfutter von Sauerstoffblaskonvertern, in Elektrolichtbogenöfen oder in Pfannen. Insofern können entsprechend recycelte Magnesiakohlenstofferzeugnisse teilweise, weitgehend oder ausschließlich als Magnesiakohlenstoff in der erfindungsgemäßen Mischung vorliegen. Gegenstand der Erfindung ist insoweit auch die Verwendung von recycelten Magnesiakohlenstofferzeugnissen als Rohstoff für die erfindungsgemäße Mischung beziehungsweise die Verwendung solch recycelter Magnesiakohlenstofferzeugnisse als Komponente eines erfindungsgemäßen Schlackenkonditionierers. Erfindungsgemäß hat sich herausgestellt, dass die Verwendung von Magnesiakohlenstoff als Kohlenstoffträger in der erfindungsgemäßen Mischung insbesondere insoweit besonders vorteilhaft sein kann, als Magnesiakohlenstoff, insbesondere soweit es als Ausbruch vorliegt, der Zusammensetzung der feuerfesten Zustellung eines metallurgischen Schmelzgefäßes angenähert sein kann und daher bei der Bildung einer Schaumschlacke besonders Wirkungsvoll zur Pflege der Zustellung durch die Schaumschlacke beitragen kann.Magnesium oxide is a so-called magnesia product, also known as magnesia or MgO-C, characterized by a magnesia (MgO) granule linked together by a carbon bond. According to a particularly preferred embodiment, magnesium oxide is present in the form of used magnesium carbonate products, ie so-called magnesia carbon outbreaks. Such magnesium oxide outbreaks are magnesia petroleum products which have been used in the steel industry, in particular as wear linings of oxygen blowing converters, in electric arc furnaces or in pans. insofar Accordingly, recycled magnesia products may be partly, substantially or exclusively present as magnesium oxide in the mixture according to the invention. The invention also relates to the use of recycled magnesia products as raw material for the mixture according to the invention or the use of such recycled magnesia products as a component of a slag conditioner according to the invention. According to the invention, it has been found that the use of magnesium carbon as a carbon carrier in the mixture according to the invention can be particularly advantageous insofar as magnesium oxide, in particular as far as it is present as an outbreak, can approximate the composition of the refractory lining of a metallurgical melting vessel and therefore in the formation of a Foam slag can especially effectively contribute to the care of the delivery by the foamed slag.

Bei Magnesiakauster handelt es sich um kaustisch gebranntes Magnesit, welches teilweise auch als Kaustermagnesit oder kaustische Magnesia bezeichnet wird. Magnesitkauster wird bekanntermaßen erhalten durch kaustisches Brennen von Magnesit (MgCO3), also durch Brennen von Magnesit bei niedrigen Temperaturen. Vorteilhaft an der Verwendung von Magnesitkauster in der erfindungsgemäßen Mischung ist insbesondere, dass dieser hoch reaktiv ist, weshalb der bei Einbringen in eine Schlacke besonders schnell MgO freisetzt und die Erhöhung der Basizität der Schlacke sowie deren MgO-Sättigung daher besonders schnell erreicht werden können.Magnesia chew is magnesite burnt by caustics, sometimes called chewing magnesite or caustic magnesia. Magnesite chew is known to be obtained by caustic burning of magnesite (MgCO 3 ), ie by burning magnesite at low temperatures. An advantage of the use of magnesite cereal in the mixture according to the invention is in particular that it is highly reactive, which is why, when introduced into a slag, it liberates MgO very rapidly and the increase in the basicity of the slag and its MgO saturation can therefore be achieved particularly quickly.

Erfindungsgemäß hat sich nunmehr herausgestellt, dass die erfindungsgemäße Mischung besonders vorteilhafte Eigenschaften insbesondere hinsichtlich ihrer Reaktivität sowie ihrer Wirkung als Mittel zum Aufschäumen der Schlacke aufweist, soweit die Mischung die weiteren Komponenten in Form von Magnesiakohlenstoff und Magnesitkauster in den folgenden Massenanteilen umfasst: Magnesiakohlenstoff: 10 bis 50 Masse-%; Magnesitkauster: 10 bis 50 Masse-%. Dabei kann erfindungsgemäß vorgesehen sein, dass auch nur eine der vorbezeichneten Komponenten in den vorbezeichneten Massenanteilen in der Mischung vorliegt.According to the invention, it has now been found that the mixture according to the invention has particularly advantageous properties, in particular with regard to their reactivity and their action as a foaming agent for the slag, as far as the mixture comprises the further components in the form of magnesia carbon and magnesite-cerium in the following proportions by mass: magnesium oxide: 10 to 50% by mass; Magnesite malt: 10 to 50% by mass. It can be provided according to the invention that only one of the aforementioned components is present in the above-mentioned mass fractions in the mixture.

Magnesiakohlenstoff kann beispielsweise in Anteilen von wenigstens 10, 15, 20, 25, 30 oder 35 Masse-% in der Mischung vorliegen. Ferner kann Magnesiakohlenstoff beispielsweise in Anteilen von höchstens 45 oder 40 Masse-% in der Mischung vorliegen.For example, magnesium carbon may be present in proportions of at least 10, 15, 20, 25, 30 or 35% by weight in the mixture. Furthermore, magnesium oxide may be present in the mixture, for example, in proportions of at most 45 or 40% by mass.

Magnesitkauster kann beispielsweise in Anteilen von wenigstens 10, 15, 20, 25, 30 oder 35 Masse-% in der Mischung vorliegen. Ferner kann Magnesitkauster beispielsweise in Anteilen von höchstens 50 oder 45 Masse-% in der Mischung vorliegen.For example, magnesite malt may be present in proportions of at least 10, 15, 20, 25, 30 or 35% by weight in the mixture. Furthermore, magnesite malt may for example be present in proportions of at most 50 or 45% by weight in the mixture.

Bevorzugt ist vorgesehen, dass die Mischung in einer verhältnismäßig geringen Korngröße vorliegt, beispielsweise zu wenigstens 50 Masse-%, 60 Masse-%, 70 Masse-%, 80 Masse-%, 90 Masse-% oder auch zu 100 Masse-% in einer Korngröße unter 5 mm.It is preferably provided that the mixture is present in a relatively small particle size, for example at least 50% by mass, 60% by mass, 70% by mass, 80% by mass, 90% by mass or even 100% by mass in one Grain size less than 5 mm.

Beispielsweise kann vorgesehen sein, dass Rohdolomit zu wenigstens 80 Masse-%, also beispielsweise auch zu wenigstens 90 Masse-% oder zu 100 Masse-% in einer Korngröße unter 5 mm vorliegt.For example, it can be provided that Rohdolomit is present at least 80% by mass, so for example, at least 90% by mass or 100% by mass in a particle size less than 5 mm.

Die weiteren Komponenten, insbesondere soweit diese in Form von Magnesiakohlenstoff und Magnesitkauster vorliegen, können bevorzugt zu wenigstens 80 Masse-%, also beispielsweise auch zu wenigstens 90 Masse-% oder zu 100 Masse-% in einer Korngröße unter 1 mm vorliegen.The other components, in particular if they are present in the form of magnesium oxide and magnesite chew, may preferably be present in at least 80% by mass, ie for example at least 90% by mass or 100% by mass in a particle size of less than 1 mm.

Indem die erfindungsgemäße Mischung diese sehr geringe, mittlere Korngröße aufweist, kann eine besonders gute und gleichmäßige Verteilung und insbesondere auch eine schnelle Auflösung der Mischung in der Schlacke erreicht werden.By virtue of the mixture according to the invention having this very small mean particle size, it is possible to achieve a particularly good and uniform distribution and, in particular, a rapid dissolution of the mixture in the slag.

Um trotz dieser geringen Korngröße der Mischung ein gutes Handling der erfindungsgemäßen Mischung erreichen zu können, kann vorgesehen sein, die Mischung in kompaktierter oder gepresster Form, beispielsweise in Form von Pellets zur Verfügung zu stellen. Um die Mischung in Form von Pellets zur Verfügung zu stellen, kann vorgesehen sein, dass eine erfindungsgemäße Mischung, die insbesondere die zuvor beschriebene Korngrößenverteilung aufweisen kann, ohne Zugaben von Additiven zu Pellets verpresst wird.In order to be able to achieve good handling of the mixture according to the invention in spite of this small particle size of the mixture, it can be provided to provide the mixture in compacted or pressed form, for example in the form of pellets. In order to provide the mixture in the form of pellets, it can be provided that a mixture according to the invention, which in particular can have the previously described particle size distribution, is pressed into pellets without additions of additives.

Beispielsweise können diese Pellets eine mandelförmige, stäbchenförmige oder kugelige Form aufweisen, beispielsweise mit einer maximalen Länge von beispielsweise 50 mm, 40 mm oder 30 mm. Die Pellets können ferner beispielsweise einen Mindestdurchmesser von 5, 10, 15, 20 oder 25 mm aufweisen. Pellets mit einer entsprechenden Größe sind gut handhabbar, jedoch gleichzeitig noch so klein, dass sie nach Eingabe in eine Schlacke dort schnell zerfallen und die Vorteile der erfindungsgemäßen, geringen Korngrößenverteilung dort schnell zum Tragen kommen können.For example, these pellets may have an almond-shaped, rod-shaped or spherical shape, for example with a maximum length of, for example, 50 mm, 40 mm or 30 mm. The pellets may also have, for example, a minimum diameter of 5, 10, 15, 20 or 25 mm. Pellets of an appropriate size are easy to handle, but at the same time so small that they quickly disintegrate there after entering a slag and the benefits of the invention, small particle size distribution can quickly come to fruition there.

Wie zuvor ausgeführt, bewirkt die spontane Kalzinierung des Rohdolomits bei Einbringen der Mischung in die Schlacke, dass die Pellets bei Einbringen in die Schlacke spontan zerfallen und hierdurch eine geringe Korngröße beziehungsweise große Kornfeinheit der Mischung mit einer hohen spezifischen Oberfläche und einer damit einhergehenden hohen Reaktivität umgehend zur Entfaltung kommt.As stated previously, the spontaneous calcination of the crude dolomite upon introduction of the mixture into the slag causes the pellets to spontaneously disintegrate upon introduction into the slag, promptly disregarding a small grain size or grain size of the mixture having a high surface area and high reactivity to unfold.

Die Mischung kann einen Anteil an Magnesiumkarbonat (MgCO3) beispielsweise im Bereich von 5 bis 30 Masse-% aufweisen, also beispielsweise auch ein einem Anteil von wenigstens 6, 7, 8 oder 9 Masse-% und beispielsweise in einem Anteil von höchstens 25, 20 oder 15 Masse-%. Der Anteil an Magnesiumkarbonat in der Mischung kann überwiegend oder vollständig als Bestandteil des Rohdolomits vorliegen.The mixture may have a proportion of magnesium carbonate (MgCO 3 ), for example in the range of 5 to 30% by mass, for example, a proportion of at least 6, 7, 8 or 9% by mass and, for example, in a proportion of at most 25, 20 or 15 mass%. The proportion of magnesium carbonate in the mixture can be predominantly or completely present as a constituent of the crude dolomite.

Der Anteil an Kalziumkarbonat (CaCO3) in der Mischung kann beispielsweise im Bereich von 5 bis 35 Masse-% liegen, also beispielsweise auch bei wenigstens 6, 7, 8, 9, 10 Masse-% und beispielsweise auch bei höchstens 30, 25, 20 oder 15 Masse-%. Der Anteil an Kalziumkarbonat in der Mischung kann überwiegend oder vollständig als Bestandteil des Rohdolomits vorliegen.The proportion of calcium carbonate (CaCO 3 ) in the mixture may, for example, be in the range of 5 to 35% by mass, that is to say for example at least 6, 7, 8, 9, 10% by mass and, for example, also at most 30, 25, 20 or 15 mass%. The proportion of calcium carbonate in the mixture may be predominantly or completely present as part of the crude dolomite.

Der Anteil an Magnesia (MgO) in der Mischung kann beispielsweise im Bereich von 20 bis 60 Masse-% liegen, also beispielsweise auch bei wenigstens 25, 30, 35, 40 oder 45 Masse-% und beispielsweise auch bei höchstens 55 oder 50 Masse-%. Die Magnesia kann beispielsweise insbesondere in den Komponenten Magnesiakohlenstoff und Magnesitkauster vorliegen.The proportion of magnesia (MgO) in the mixture may, for example, be in the range from 20 to 60% by mass, for example also at least 25, 30, 35, 40 or 45% by mass and for example also at most 55 or 50% by mass. %. The magnesia can be present, for example, in particular in the components magnesia carbon and magnesite chew.

Kohlenstoff kann in der erfindungsgemäßen Mischung beispielsweise in einem Anteil im Bereich von 3 bis 15 Masse-% vorliegen, also beispielsweise auch in einem Anteil von wenigstens 4, 5 oder 6 Masse-% und beispielsweise auch in einem Anteil von höchstens 14, 13, 12, 11 oder 10 Masse-%. Kohlenstoff kann in der Mischung überwiegend oder vollständig in der Komponente in Form von Magnesiakohlenstoff vorliegen.Carbon may be present in the mixture according to the invention, for example in a proportion in the range of 3 to 15% by mass, ie, for example, in a proportion of at least 4, 5 or 6% by mass and, for example, in a proportion of at most 14, 13, 12 , 11 or 10% by mass. Carbon may be predominantly or completely present in the mixture in the form of magnesium carbon in the mixture.

Kalziumoxid (CaO), der beispielsweise als Nebenbestandteil von Magnesitkauster in die Mischung eingebracht sein kann, kann beispielsweise in Anteilen im Bereich von 0 bis 40 Masse-% in der Mischung vorliegen, also beispielsweise auch in Anteilen von wenigstens 5, 10 oder 15 Masse-% und beispielsweise auch in Anteilen von höchstens 35, 30, 25 oder 20 Masse-%.Calcium oxide (CaO), which may for example be incorporated into the mixture as a secondary constituent of magnesite chew, can be present in proportions in the range of 0 to 40% by mass in the mixture, for example also in proportions of at least 5, 10 or 15% by weight. % and, for example, also in proportions of at most 35, 30, 25 or 20% by mass.

Weitere Stoffe, beispielsweise SiO2, Fe2O3, Al2O3, H2O oder P2O5, können als Verunreinigungen über die Komponenten der Mischung in diese Eingebracht sein. Dabei können diese Stoffe beispielsweise in den folgenden Anteilen in der Mischung vorliegen, wobei die Anteile dieser Stoffe einzeln oder in beliebiger Kombination in den nachfolgenden Anteilen in der Mischung vorliegen können:

SiO2:
0 bis 10 Masse-%, also beispielsweise auch in Anteilen von wenigstens 0,5 oder 1 Masse-% und beispielsweise in Anteilen von höchstens 9, 8, 7, 6, 5, 4, 3 oder 2 Masse-%;
Fe2O3:
0 bis 10 Masse-%, also beispielsweise auch in Anteilen von wenigstens 0,5 oder 1 Masse-% und beispielsweise in Anteilen von höchstens 9, 8, 7, 6, 5, 4, 3 oder 2 Masse-%;
Al2O3:
0 bis 5 Masse-%, also beispielsweise auch in Anteilen von wenigstens 0,5 oder 1 oder 1,5 oder 2 Masse-% und beispielsweise in Anteilen von höchstens 4, 3 oder 2,5 Masse-%;
H2O:
0 bis 3 Masse-%, also beispielsweise auch in Anteilen von wenigstens 0,5 oder 1 Masse-% und beispielsweise in Anteilen von höchstens 2 oder 1 Masse-%;
P2O5:
0 bis 0,5 Masse-%.
Other substances, for example SiO 2 , Fe 2 O 3 , Al 2 O 3 , H 2 O or P 2 O 5 , may be incorporated into the mixture as impurities via the components of the mixture. These substances may be present, for example, in the following proportions in the mixture, it being possible for the proportions of these substances to be present individually or in any desired combination in the following proportions in the mixture:
SiO 2 :
0 to 10% by mass, that is also for example in proportions of at least 0.5 or 1% by mass and, for example, in proportions of at most 9, 8, 7, 6, 5, 4, 3 or 2% by mass;
Fe 2 O 3 :
0 to 10% by mass, that is also for example in proportions of at least 0.5 or 1% by mass and, for example, in proportions of at most 9, 8, 7, 6, 5, 4, 3 or 2% by mass;
Al 2 O 3 :
0 to 5 mass%, that is, for example, in proportions of at least 0.5 or 1 or 1.5 or 2% by mass and, for example, in proportions of at most 4, 3 or 2.5% by mass;
H 2 O:
0 to 3 mass%, that is, for example, in proportions of at least 0.5 or 1 mass% and, for example, in proportions of at most 2 or 1 mass%;
P 2 O 5 :
0 to 0.5 mass%.

Erfindungsgemäß hat sich herausgestellt, dass die Mischung sehr sensibel auf weitere Komponenten und Stoffe reagieren kann. Insofern kann vorgesehen sein, dass die erfindungsgemäße Mischung neben Komponenten in Form von Rohmagnesit, Magnesiakohlenstoff und Magnesitkauster Anteile an weiteren Komponenten in einem Anteil unter 10 Masse-% aufweist, also beispielsweise auch in einem Anteil unter 9, 8, 7, 6, 5, 4, 3, 2 oder 1 Masse-%. Es kann vorgesehen sein, dass die Mischung neben den vorgenannten Stoffen MgCO3, CaCO3, MgO, C, CaO, SiO2, Fe2O3, Al2O3, H2O, P2O5, insbesondere in den vorbezeichneten Massenanteilen, weitere Stoffe nur in einem Anteil unter 10 Masse-% aufweist, also beispielsweise auch in einem Anteil unter 9, 8, 7, 6, 5, 4, 3, 2 oder 1 Masse-%.According to the invention, it has been found that the mixture can react very sensitively to other components and substances. In this respect, it can be provided that the mixture according to the invention contains, in addition to components in the form of raw magnesite, magnesium carbon and magnesite chew, fractions of other components in a proportion of less than 10% by mass, ie, for example, in a proportion of less than 9, 8, 7, 6, 5, 4, 3, 2 or 1 mass%. It can be provided that the mixture in addition to the aforementioned substances MgCO 3 , CaCO 3 , MgO, C, CaO, SiO 2 , Fe 2 O 3 , Al 2 O 3 , H 2 O, P 2 O 5 , in particular in the aforementioned Mass fractions, other substances only in a proportion of less than 10% by mass, that is, for example, in a proportion of less than 9, 8, 7, 6, 5, 4, 3, 2 or 1% by mass.

Um die erfindungsgemäße Mischung erfindungsgemäß in Form von Pellets zur Verfügung zu stellen, kann vorgesehen sein, die Mischung vor ihrer Verpressung zu Pellets mit einem Bindemittel anzumachen. Beispielsweise kann ein sulfatisches Bindemittel vorgesehen sein, beispielsweise eine Bittersalzlösung. Die Konzentration von Bittersalz in der Bittersalzlösung kann beispielsweise im Bereich von 0,1 bis 0,3 Masse-% liegen. Es kann vorgesehen sein, dass die Mischung mit einem Anteil an Bindemittel im Bereich von 5 bis 15 Masse-%, bezogen auf die Mischung ohne das Bindemittel, angemacht wird.In order to make the mixture according to the invention available in the form of pellets, it can be provided to make the mixture with a binder before it is pressed into pellets. For example, a sulphate binder may be provided, for example an Epsom salt solution. For example, the concentration of epsom salt in the epsom salt solution may be in the range of 0.1 to 0.3 mass%. It can be provided that the mixture with a proportion of binder in the range of 5 to 15 mass%, based on the mixture without the binder, is made.

Zur Verbesserung der Grünfestigkeit der Pellets kann ferner vorgesehen sein, dass die Mischung noch eines oder mehrere temporäre Bindemittel umfasst, beispielsweise eines oder mehrere der folgenden temporären Bindemittel: Glukose, Stärke, ein oder mehrere silikatische Bindemittel oder ein oder mehrere phosphatische Bindemittel.To improve the green strength of the pellets, it may further be provided that the mixture also comprises one or more temporary binders, for example one or more of the following temporary binders: glucose, starch, one or more silicate binders or one or more phosphatic binders.

Gegenstand der Erfindung ist auch ein Verfahren zur Konditionierung einer bei der Eisen- und Stahlmetallurgie auf einer Metallschmelze in einem metallurgischen Gefäß befindlichen Schlacke mit folgenden Schritten:

  • zur Verfügungstellung einer erfindungsgemäßen Mischung;
  • Einbringen der Mischung in die auf der Metallschmelze in einem metallurgischen Gefäß befindliche Schlacke.
The invention also provides a process for conditioning a slag present in iron and steel metallurgy on a molten metal in a metallurgical vessel, comprising the following steps:
  • providing a mixture according to the invention;
  • Introducing the mixture into the slag contained on the molten metal in a metallurgical vessel.

Die Mischung kann, wie hierin beschrieben, also beispielsweise auch in kompaktierter oder gepresster Form, beispielsweise in Form von Pellets zur Verfügung gestellt werden.The mixture may, as described herein, so for example, in compacted or compressed form, for example in the form of pellets are provided.

Dabei kann die Mischung mit einem oder mehreren der hierin beschriebenen Bindemittel gemischt und anschließend zu Pellets, insbesondere mit den hierin beschriebenen Dimensionen, gepresst werden.In this case, the mixture can be mixed with one or more of the binders described herein and then pressed into pellets, in particular with the dimensions described herein.

Die zur Verfügung gestellte Mischung, beispielsweise in Form von Pellets, wird auf die Schlacke gegeben und sinkt in diese ein, so dass sie dort ihre erfindungsgemäße Wirkung entfalten kann.The provided mixture, for example in the form of pellets, is added to the slag and sinks into it so that it can unfold its effect there according to the invention.

Die erfindungsgemäße Mischung eignet sich grundsätzlich als Schlackenkonditionierer für Schlacken auf einer Metallschmelze in einem beliebigen metallurgischen Gefäß, beispielsweise für Metallschmelzen in Konvertern, Elektrolichtbogenöfen oder Pfannen. Besonders bevorzugt wird die erfindungsgemäße Mischung als Schlackenkonditionierer für Schlacken auf solchen Metallschmelzen verwendet, die sich in einem metallurgischen Gefäß mit einer basischen Zustellung befinden, also insbesondere mit einer Zustellung auf Basis wenigstens eines der folgenden Werkstoffe: Magnesia, Magnesia-Kohlenstoff, Doloma oder Doloma-Kohlenstoff.The mixture according to the invention is fundamentally suitable as a slag conditioner for slags on a molten metal in any metallurgical vessel, for example for molten metals in converters, electric arc furnaces or ladles. The mixture according to the invention is particularly preferably used as a slag conditioner for slags on molten metals which are located in a metallurgical vessel with a basic feed, ie in particular with a feed based on at least one of the following materials: magnesia, magnesia-carbon, doloma or dolomite. Carbon.

Gegenstand der Erfindung ist ferner die Verwendung einer hierin beschriebenen, erfindungsgemäßen Mischung zur Konditionierung einer bei der Eisen- und Stahlmetallurgie auf einer Metallschmelze in einem metallurgischen Gefäß befindlichen Schlacke.The invention furthermore relates to the use of a mixture according to the invention described herein for conditioning a slag present in iron and steel metallurgy on a molten metal in a metallurgical vessel.

Die Verwendung kann dabei wie hierin offenbart erfolgen.The use can be carried out as disclosed herein.

Sämtliche der hierin offenbarten Merkmale der Erfindung können, einzeln oder in Kombination, beliebig miteinander kombiniert sein.All of the features of the invention disclosed herein may be combined with each other singly or in combination.

Die Erfindung wird anhand des nachfolgenden Ausführungsbeispiels näher erläutert.The invention will be explained in more detail with reference to the following embodiment.

Zunächst wurde im Ausführungsbeispiel eine Mischung zur Verfügung gestellt, die die folgenden Komponenten gemäß Tabelle 1 aufwies. Tabelle 1 Komponente Massenanteile [%] Rohdolomit 22 Magnesiakohlenstoff 40 Magnesitkauster 38 First, in the embodiment, a mixture was provided which had the following components according to Table 1. Table 1 component Mass shares [%] dolomite 22 Magnesiakohlenstoff 40 Magne Sitka Uster 38

Der verwendete Rohdolomit wies einen Anteil an Dolomit von über 95 Masse-% auf, bezogen auf den Rohdolomit. Als Nebenbestandteile lagen insbesondere Al2O3, Fe2O3 und SiO2 vor.The crude dolomite used had a proportion of dolomite of more than 95% by mass, based on the crude dolomite. In particular, Al 2 O 3 , Fe 2 O 3 and SiO 2 were present as secondary constituents.

Bei der Komponente in Form von Magnesiakohlenstoff handelte es sich um Ausbruchmaterial in Form von recyclierten Magnesiakohlenstofferzeugnissen. Neben dem Hauptbestandteil MgO wies diese Komponente einen Anteil an Kohlenstoff von 28 Masse-% auf, bezogen auf die Gesamtmasse der Komponenten.The magnesia carbon component was excavated material in the form of recycled magnesia petroleum products. In addition to the main constituent MgO, this component had a carbon content of 28% by mass, based on the total mass of the components.

Der Rohdolomit lag in einer Korngröße unter 5 mm und die Komponenten Magnesiakohlenstoff und Magnesitkauster in einer Korngröße unter 1 mm vor.The crude dolomite was present in a particle size of less than 5 mm and the components magnesia carbon and magnesite cereal in a particle size of less than 1 mm.

Die Mischung wurde mit 10 % Bindemittel in Form von Bittersalzlösung, bezogen auf die Masse der Mischung ohne das Bindemittel, gemischt und zu mandelförmigen Pellets mit einer Dicke von etwa 15 mm und einer Länge von etwa 30 mm gepresst.The mixture was mixed with 10% binder in the form of Epsom salt based on the mass of the mixture without the binder and pressed into almond-shaped pellets having a thickness of about 15 mm and a length of about 30 mm.

Die Pellets wurden anschließend bei etwa 300° Celsius getrocknet und nach Abkühlung in dieser Form als Schlackenkonditionierer zur Verfügung gestellt.The pellets were then dried at about 300 ° C and, after cooling in this form, made available as a slag conditioner.

Claims (6)

  1. A mixture to be introduced into the slag located on a metal melt in iron and steel metallurgy, said mixture comprising the following components in the following mass proportions:
    1.1 raw dolomite in a range from 10 to 90 mass %;
    1.2 one or more further components comprising at least the following constituents:
    1.2.1 MgO and
    1.2.2 carbon,
    in a range from 90 to 10 mass %; wherein
    1.3 the mixture comprises further components in the form of at least one of the components magnesia-carbon and caustic magnesite in the following mass proportions:
    magnesia-carbon: 10 to 50 mass %;
    caustic magnesite: 10 to 50 mass %.
  2. The mixture according to claim 1, in which the further components are present in the form of magnesia-carbon and caustic magnesite.
  3. The mixture according to at least one of the preceding claims, in which the mixture comprises further components in the form of magnesia-carbon and caustic magnesite in the following mass proportions:
    magnesia-carbon: 10 to 50 mass %;
    caustic magnesite: 10 to 50 mass %.
  4. The mixture according to at least one of the preceding claims, which mixture is present in the form of pellets.
  5. A method for conditioning a slag located on a metal melt in a metallurgical vessel in iron and steel metallurgy, said method comprising the following steps:
    5.1 providing a mixture according to at least one of the preceding claims;
    5.2 introducing the mixture into the slag located on the metal melt in the metallurgical vessel.
  6. Use of a mixture according to at least one of Claims 1 to 4 for conditioning a slag located on a metal melt in a metallurgical vessel in iron and steel metallurgy.
EP14198439.3A 2014-12-17 2014-12-17 Mixture, use of this mixture as well as method for conditioning a slag on molten metal from the processing of iron and steel in a metallurgical vessel Not-in-force EP3034633B1 (en)

Priority Applications (12)

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PL14198439T PL3034633T3 (en) 2014-12-17 2014-12-17 Mixture, use of this mixture as well as method for conditioning a slag on molten metal from the processing of iron and steel in a metallurgical vessel
SI201430198A SI3034633T1 (en) 2014-12-17 2014-12-17 Mixture, use of this mixture as well as method for conditioning a slag on molten metal from the processing of iron and steel in a metallurgical vessel
HUE14198439A HUE034189T2 (en) 2014-12-17 2014-12-17 Mixture, use of this mixture as well as method for conditioning a slag on molten metal from the processing of iron and steel in a metallurgical vessel
ES14198439.3T ES2623457T3 (en) 2014-12-17 2014-12-17 Mixture, use of this mixture as well as procedure for conditioning a slag found on molten metal in a metallurgical bucket in the iron and steel metallurgical industry
EP14198439.3A EP3034633B1 (en) 2014-12-17 2014-12-17 Mixture, use of this mixture as well as method for conditioning a slag on molten metal from the processing of iron and steel in a metallurgical vessel
PCT/EP2015/071607 WO2016096178A1 (en) 2014-12-17 2015-09-21 Mixture, use of said mixture and process for conditioning a slag located on a metal melt in a metallurgical vessel in iron and steel metallurgy
CN201580059266.6A CN107148482A (en) 2014-12-17 2015-09-21 Mixture, the purposes of the mixture and the method for pre-processing the slag on the metal bath being present in Ferrous Metallurgy in metallurgical tank
US15/529,344 US20170275714A1 (en) 2014-12-17 2015-09-21 Mixture, use of this mixture, and method for conditioning a slag located on a metal melt in a metallurgical vessel in iron and steel metallurgy
BR112017009332A BR112017009332A2 (en) 2014-12-17 2015-09-21 mixture to be introduced into the slag, process for conditioning a slag and use of a mixture
RU2017112347A RU2017112347A (en) 2014-12-17 2015-09-21 MIXTURE, ITS APPLICATION, AND ALSO A METHOD OF CONDITIONING THE SLAG IN THE METALLURGICAL PRODUCTION OF IRON AND STEEL ON A LIQUID METAL IN A METALLURGICAL VESSEL
ARP150103544A AR102499A1 (en) 2014-12-17 2015-11-03 MIXING AND PROCEDURE FOR THE CONDITIONING OF THE ESCORIA THAT IS FOUND ON THE METAL FOUNDED IN A METALLURGICAL BUCKET IN THE METALLURGICAL INDUSTRY OF IRON OR STEEL
TW104137004A TW201623189A (en) 2014-12-17 2015-11-10 Mixture, use of this mixture, and method for conditioning a slag located on a metal melt in a metallurgical vessel in iron and steel metallurgy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14198439.3A EP3034633B1 (en) 2014-12-17 2014-12-17 Mixture, use of this mixture as well as method for conditioning a slag on molten metal from the processing of iron and steel in a metallurgical vessel

Publications (2)

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EP3034633A1 EP3034633A1 (en) 2016-06-22
EP3034633B1 true EP3034633B1 (en) 2017-03-15

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EP14198439.3A Not-in-force EP3034633B1 (en) 2014-12-17 2014-12-17 Mixture, use of this mixture as well as method for conditioning a slag on molten metal from the processing of iron and steel in a metallurgical vessel

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US (1) US20170275714A1 (en)
EP (1) EP3034633B1 (en)
CN (1) CN107148482A (en)
AR (1) AR102499A1 (en)
BR (1) BR112017009332A2 (en)
ES (1) ES2623457T3 (en)
HU (1) HUE034189T2 (en)
PL (1) PL3034633T3 (en)
RU (1) RU2017112347A (en)
SI (1) SI3034633T1 (en)
TW (1) TW201623189A (en)
WO (1) WO2016096178A1 (en)

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US10781499B2 (en) * 2018-01-17 2020-09-22 Air Products And Chemicals, Inc. Bottom stirring tuyere and method for a basic oxygen furnace

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WO1994019496A1 (en) * 1993-02-23 1994-09-01 Laporte Group Australia Limited Insulating/metallurgical composite and method of manufacturing same
DE10323505A1 (en) * 2003-05-24 2004-12-09 Sms Demag Ag Process for producing a foam slag on high-chromium melts in an electric furnace
US7914599B2 (en) * 2004-11-17 2011-03-29 Ism, Inc. Slag conditioner composition, process for manufacture and method of use in steel production
US20070266824A1 (en) * 2006-05-19 2007-11-22 Stein Joseph L Using a slag conditioner to beneficiate bag house dust from a steel making furnace
CN103352100A (en) * 2013-07-23 2013-10-16 山东莱钢永锋钢铁有限公司 Raw rauhkalk steelmaking method

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Publication number Publication date
BR112017009332A2 (en) 2017-12-19
ES2623457T3 (en) 2017-07-11
WO2016096178A1 (en) 2016-06-23
PL3034633T3 (en) 2017-08-31
AR102499A1 (en) 2017-03-01
SI3034633T1 (en) 2017-06-30
TW201623189A (en) 2016-07-01
CN107148482A (en) 2017-09-08
RU2017112347A (en) 2018-10-11
US20170275714A1 (en) 2017-09-28
HUE034189T2 (en) 2018-02-28
EP3034633A1 (en) 2016-06-22

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