WO1997021841A1 - Desulphurating agent for co-injection treatment of pig iron melts - Google Patents

Desulphurating agent for co-injection treatment of pig iron melts Download PDF

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Publication number
WO1997021841A1
WO1997021841A1 PCT/EP1996/005515 EP9605515W WO9721841A1 WO 1997021841 A1 WO1997021841 A1 WO 1997021841A1 EP 9605515 W EP9605515 W EP 9605515W WO 9721841 A1 WO9721841 A1 WO 9721841A1
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Prior art keywords
magnesium
granules
calcium carbide
injection
grain size
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PCT/EP1996/005515
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German (de)
French (fr)
Inventor
Bernd Neuer
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Skw Trostberg Aktiengesellschaft
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Priority to PL96327174A priority Critical patent/PL185316B1/en
Priority to DE59604915T priority patent/DE59604915D1/en
Priority to EP96943075A priority patent/EP0866880B1/en
Publication of WO1997021841A1 publication Critical patent/WO1997021841A1/en

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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
    • C21C1/025—Agents used for dephosphorising or desulfurising

Definitions

  • the invention relates to an agent and a method for desulfurizing pig iron melts by the co-injection of magnesium granules and a second component.
  • magnesium fines below 0.1 mm are rejected to avoid the risk of a dust explosion.
  • magnesium granules which have a grain size of approximately 0.1 to 0.8 mm have therefore also become established in practice, the granules also being encased for additional security.
  • the wrapping The granules serve the purpose of reducing the relatively easy flammability of the highly reactive metal
  • This so-called "passivation" of the pyrogenic magnesium is usually carried out by coating with organic nitrogen compounds, of which compounds of the NCN type, for example s-triazme and guanidine compounds, have proven to be particularly suitable in practice.
  • organic nitrogen compounds of which compounds of the NCN type, for example s-triazme and guanidine compounds, have proven to be particularly suitable in practice.
  • an adhesion promoter mostly viscous mineral oils or vegetable oils
  • the manufacturers of the magnesium granules manufacture a product which has a relatively high proportion of particles between 0.5 and 0.8 mm in size can only be conveyed pneumatically very poorly and therefore only with great effort and therefore require very long unloading and downtimes of the silo vehicles, whereby on the part of the user very high consumption of inert gas, usually nitrogen, is necessary, which is the co-injection process additionally expensive.
  • the object of the invention is therefore to overcome these difficulties which occur in the pneumatic handling of magnesium granules in the context of the treatment of the projection.
  • Another object of the invention is a method for desulfurizing pig iron by co-injecting magnesium granules with a grain size of 0.1 to 0.8 mm and a second component, these two components being separated, pneumatically conveyed and only immediately before being introduced into the melt is mixed, which is characterized in that one uses a magnesium granulate which contains 5 to 20 wt .-% calcium carbide with a grain size ⁇ 0.1 mm.
  • the essence of the invention is therefore that 5 to 20 wt .-% of the magnesium granules for calcium carbide with a grain size ⁇ 0.1 mm are replaced.
  • the amount of calcium carbide is preferably 8 to 12% by weight.
  • the magnesium granules can be present in coated form in a manner known per se.
  • the shell of the magnesium grains preferably consists of organic nitrogen compounds, in particular those of the NCN type, as explained in more detail above.
  • the desulfurizing agent component according to the invention is conveyed separately from the other co-injection component, which is usually calcium carbide and / or lime, and is mixed with the other co-injection component as homogeneously as possible only immediately before being introduced into the pig iron melt.
  • the other co-injection component which is usually calcium carbide and / or lime
  • the conveying rate when unloading the silo vehicles could be increased from an average of 200 to 240 kg min " 1 to approx. 500 kg / min " 1 , which also involves a corresponding reduction in the consumption of production gas.
  • the invention thus brings a significant improvement. Since the magnesium prices are an order of magnitude higher than that of calcium carbide, the replacement of up to 20 wt.
  • a desulphurization mixture consisting of uncoated Mg granules with a particle size distribution between 0.1 and 0.8 mm was used as the first co-injection component and calcium carbide with a grain size of ⁇ 0.1 mm as the second co-injection component. 14 batches were selected from 1000 batches of a normal steel mill production campaign, which were then desulfurized exactly from 0.05% [S] to 0.005% [S]. With a medium one Batch weight of 210 t, the average consumption of desulfurization mixture was:

Abstract

A desulphurating agent is proposed for co-injection treatment of pig iron melts by injection of magnesium granulate and, separately, of the second injection component consisting of a magnesium granulate with a grain size of between 0.1 and 0.8 mm and containing 5-20 wt % calcium carbide with a grain size of ≤ 0.1 mm.

Description

Entschwefelungsmittel zur Koinjektions-Behandlung von Roheisenschmelzen Desulphurising agent for the co-injection treatment of pig iron melts
Beschreibungdescription
Die Erfindung betrifft ein Mittel und ein Verfahren zum Entschwefeln von Roheisenschmelzen durch Koinjektion von Magnesium-Granulat und einer zweiten Komponente.The invention relates to an agent and a method for desulfurizing pig iron melts by the co-injection of magnesium granules and a second component.
Injektionsmetallurgische Verfahren zum Einbringen von Entschwefelungsmitteln in Roheisenschmelzen außerhalb des Hochofens sind weitverbreitet. In der Praxis haben sich hierfür insbesondere Entschwefelungsgemische durchgesetzt, die aus den beiden Komponenten Magnesium und Calciumcarbid oder/und Kalk bestehen, die erst unmittelbar vor dem Einbringen in die Schmelze vermischt werden.Injection metallurgical processes for introducing desulfurization agents into pig iron melts outside the blast furnace are widespread. In practice, desulphurization mixtures, which consist of the two components magnesium and calcium carbide and / or lime and which are only mixed immediately before they are introduced into the melt, have become established.
Die gemeinsame Zugabe der beiden getrennt zugeführten Komponenten mit Hilfe von Koinjektoren macht einen relativ großen apparativen Aufwand erforderlich. Unabdingbare Voraussetzung für die exakte Dosierung der Komponenten ist dabei eine homogene Mischung am Blaslanzenaustritt . Die Homogenität der verwendeten Mischung in der Förderlanze hängt beim Koinjektionsverfahren aber ganz stark von den jeweiligen pneumatischen Fördereigenschaften der Einzelkomponenten ab, weshalb insbesondere das Problem besteht, daß die speziellen Eigenschaften des eingesetzten Magnesium-Granulats eine reibungslose pneumatische Förderung im Vorfeld der eigentlichen Schmelzebehai.dlung erschweren.The joint addition of the two separately supplied components with the help of co-injectors requires a relatively large amount of equipment. An indispensable prerequisite for the exact dosing of the components is a homogeneous mixture at the blow lance outlet. The homogeneity of the mixture used in the conveying lance depends very much on the respective pneumatic conveying properties of the individual components in the case of the co-injection process, which is why there is in particular the problem that the special properties of the magnesium granules used make smooth pneumatic conveying in the run-up to the actual melt treatment difficult .
So werden allgemein Magnesium-Feinanteile unter 0,1 mm zur Vermeidung der Gefahr einer Staubexplosion abgelehnt . Aus Sicherheitsgründen hat sich in der Praxis deshalb auch ein Magnesium-Granulat durchgesetzt, das eine Körnung von etwa 0,1 bis 0,8 mm aufweist, wobei die Granulate zur zusätzlichen Erhöhung der Sicherheit auch umhüllt sein können. Die Umhüllung der Granulate erfüllt dabei den Zweck, die relativ leichte Brennbarkeit des hochreaktiven Metalls herabzusetzenIn general, magnesium fines below 0.1 mm are rejected to avoid the risk of a dust explosion. For safety reasons, magnesium granules which have a grain size of approximately 0.1 to 0.8 mm have therefore also become established in practice, the granules also being encased for additional security. The wrapping The granules serve the purpose of reducing the relatively easy flammability of the highly reactive metal
Diese sogenannte "Passivierung" des pyrogenen Magnesiums erfolgt üblicherweise durch die Beschichtung mit organischen StickstoffVerbindungen, von denen sich Verbindungen vom NCN- Typ, also beispielsweise s-Triazme und Guanidinverbmdungen, in der Praxis als besonders geeignet erwiesen haben. Bevorzugt werden Dicyandiamid, Melamin oder Melammcyanurat, Guanylharnstoff oder Guanylharnstoffphosphat, die mit Hilfe eines Haftvermittlers (meist viskose Mineralole oder pflanzliche Ole) auf das feinteilige Magnesiumkorn aufgebracht werden, das solchermaßen beschichtet nun sicher zum Entschwefeln von Roheisenschmelzen eingesetzt werden kann (DE- PS 41 38 231) .This so-called "passivation" of the pyrogenic magnesium is usually carried out by coating with organic nitrogen compounds, of which compounds of the NCN type, for example s-triazme and guanidine compounds, have proven to be particularly suitable in practice. Preference is given to dicyandiamide, melamine or melamine cyanurate, guanylurea or guanylurea phosphate, which are applied to the finely divided magnesium grain with the aid of an adhesion promoter (mostly viscous mineral oils or vegetable oils), which can now be coated in such a way that it can be safely used to desulfurize pig iron melts (DE-PS 41 38 231).
Zur Einhaltung einer hohen Produktivität der Zerklemerungsanlagen fertigen die Hersteller der Magnesium- Granulate ein Produkt, das einen relativ hohen Anteil an Teilchen der Größe zwischen 0,5 und 0,8 mm aufweist Nachteil eines Granulates mit dieser Korngrößenverteilung ist aber, daß sich die grobkörnigen Anteile nur äußerst schlecht und deshalb auch nur sehr aufwendig pneumatisch fördern lassen und deshalb sehr lange Entlade- und Stillstandzeiten der Silo-Fahrzeuge bedingen, wobei auf Seite der Anwender auch sehr hohe Verbrauche an inertem Fordergas, in dar Regel Stickstoff, notwendig werden, was das Koinjektionsverfahren zusätzlich verteuert.To maintain the high productivity of the crushing plants, the manufacturers of the magnesium granules manufacture a product which has a relatively high proportion of particles between 0.5 and 0.8 mm in size can only be conveyed pneumatically very poorly and therefore only with great effort and therefore require very long unloading and downtimes of the silo vehicles, whereby on the part of the user very high consumption of inert gas, usually nitrogen, is necessary, which is the co-injection process additionally expensive.
Aufgabe der Erfindung ist daher die Überwindung dieser bei der pneumatischen Forderung von Magnesium-Granulat im Rahmen der Komjektions-Behandlung auftretenden Schwierigkeiten.The object of the invention is therefore to overcome these difficulties which occur in the pneumatic handling of magnesium granules in the context of the treatment of the projection.
Gelost wird diese Aufgabe erfindungsgemäß durch ein Entschwefelungsmittel für die Komjektions-Behandlung von Roheisenschmelzen durch Injektion von Magnesium-Granulat mit einer Korngröße zwischen J,l und 0, 8 mm und, getrennt davon der zweiten Injektionskomponente, welches dadurch gekennzeichnet ist, daß das Magnesium-Granulat 5 bis 20 Gew.-% Calciumcarbid mit einer Körnung ≤ als 0,1 mm enthält.This object is achieved according to the invention by a desulfurization agent for the projection treatment of pig iron melts by injection of magnesium granules with a grain size between J, 1.8 and 0.8 mm and, separately from that second injection component, which is characterized in that the magnesium granules contain 5 to 20 wt .-% calcium carbide with a grain size ≤ than 0.1 mm.
Ein weiterer Gegenstand der Erfindung ist ein Verfahren zum Entschwefeln von Roheisen durch Koinjektion von Magnesium- Granulat mit einer Korngröße von 0,1 bis 0,8 mm und einer zweiten Komponente, wobei diese beiden Komponenten getrennt, pneumatisch gefördert und erst unmittelbar vor dem Einbringen in die Schmelze gemischt werden, welches dadurch gekennzeichnet ist, daß man ein Magnesium-Granulat verwendet, welches 5 bis 20 Gew.-% Calciumcarbid mit einer Körnung ≤ 0,1 mm enthält.Another object of the invention is a method for desulfurizing pig iron by co-injecting magnesium granules with a grain size of 0.1 to 0.8 mm and a second component, these two components being separated, pneumatically conveyed and only immediately before being introduced into the melt is mixed, which is characterized in that one uses a magnesium granulate which contains 5 to 20 wt .-% calcium carbide with a grain size ≤ 0.1 mm.
Der Kern der Erfindung besteht also darin, daß 5 bis 20 Gew.-% des Magnesium-Granulats für Calciumcarbid mit einer Körnung ≤ 0,1 mm ersetzt werden. Bevorzugt beträgt die Menge an Calciumcarbid 8 bis 12 Gew.-%. Das Magnesium-Granulat kann in an sich bekannter Weise in umhüllter Form vorliegen. Bevorzugt besteht die Hülle der Magnesiumkörner aus organischen StickstoffVerbindungen, insbesondere solchen vom NCN-Typ wie oben näher erläutert .The essence of the invention is therefore that 5 to 20 wt .-% of the magnesium granules for calcium carbide with a grain size ≤ 0.1 mm are replaced. The amount of calcium carbide is preferably 8 to 12% by weight. The magnesium granules can be present in coated form in a manner known per se. The shell of the magnesium grains preferably consists of organic nitrogen compounds, in particular those of the NCN type, as explained in more detail above.
Die erfindungsgemäße Entschwefelungsmittelkomponente wird getrennt von der anderen Koinjektionskomponente, die in der Regel Calciumcarbid oder/und Kalk ist, gefördert und erst unmittelbar vor dem Einbringen in die Roheisenschmelze mit der anderen Koinjektionskomponente möglichst homogen gemischt.The desulfurizing agent component according to the invention is conveyed separately from the other co-injection component, which is usually calcium carbide and / or lime, and is mixed with the other co-injection component as homogeneously as possible only immediately before being introduced into the pig iron melt.
Überraschend hat sich gezeigt, daß sich mit dem Zusatz dieser überaus feinteiligen Komponente zum Magnesium-Granulat nicht nur dessen angestrebte, bessere Fluidisierung und problemlose pneumatische Förderung in einfacher Weise erreichen läßt, sondern daß auch die Bruttoverbräuche an Magnesium herabgesetzt werden. Die Substitution von 5 bis 20 Gew.-% der Magnesium- Granulate durch das feinteilige Calciumcarbid bewirkt bei sonst gleicher Verfahrensweise statistisch signifikant gleiche Entschwefelungsleistungen des Mittels im Vergleich mit nicht Calciumcarbid-angereichertem Magnesium-Granulat, obwohl 5 bis 20 Gew.-% weniger Magnesium eingesetzt wurden.Surprisingly, it has been shown that with the addition of this extremely fine-particle component to the magnesium granulate, not only can the desired, better fluidization and problem-free pneumatic conveying be achieved in a simple manner, but also the gross consumption of magnesium can be reduced. The substitution of 5 to 20% by weight of the magnesium granules with the finely divided calcium carbide results in statistically significantly the same desulfurization performance of the agent compared to not using the otherwise identical procedure Calcium carbide-enriched magnesium granules, although 5 to 20% by weight less magnesium was used.
Dieser Effekt ist besonders überraschend, da die bisherigen Erfahrungen gezeigt haben, daß die spezifische Entschwefelungswirkung des Magnesiums etwa siebenfach stärker ist als die des Calciumcarbids, d.h. in bezug auf die Entschwefelungswirkung wurde bisher angenommen, daß eine bestimmte Menge an Magnesium nur durch die siebenfache Menge an Calciumcarbid ersetzt werden kann.This effect is particularly surprising since experience to date has shown that the specific desulfurization effect of magnesium is about seven times greater than that of calcium carbide, i.e. With regard to the desulfurization effect, it has previously been assumed that a certain amount of magnesium can only be replaced by seven times the amount of calcium carbide.
Der Vorteil des erfindungsgemäßen Entschwefelungsmittels zeigt sich aber auch in anderen Bereichen: So konnte die Förderrate bei der Entladung der Silo-Fahrzeuge durch den Einsatz des Mittels von durchschnittlich 200 bis 240 kg min"1 auf ca. 500 kg/min"1 gesteigert werden, womit auch eine entsprechende Reduzierung des Verbrauchs an Fördergas verbunden ist.The advantage of the desulfurization agent according to the invention can also be seen in other areas: for example, the conveying rate when unloading the silo vehicles could be increased from an average of 200 to 240 kg min " 1 to approx. 500 kg / min " 1 , which also involves a corresponding reduction in the consumption of production gas.
Auch aus wirtschaftlicher Sicht bringt die Erfindung somit eine deutliche Verbesserung. Da die Magnesiumpreise verglichen mit Calciumcarbid um eine Größenordnung höher liegen, bedeutet der Ersatz von bis zu 20 Gew.-% Magnesium durch das preiswertere Calciumcarbid bei gleicher Entschwefelungsleistung eine deutliche Kostensenkung bei der Roheisenentschwefelung.From an economic point of view, the invention thus brings a significant improvement. Since the magnesium prices are an order of magnitude higher than that of calcium carbide, the replacement of up to 20 wt.
BeispieleExamples
Beispiel 1 (Vergleich)Example 1 (comparison)
Verwendet wurde ein Entschwefelungsgemisch bestehend aus nicht umhülltem Mg-Granulat der Korngrößenverteilung zwischen 0,1 und 0,8 mm als 1. Koinjektionskomponente und Calciumcarbid der Körnung < 0,1 mm als 2. Koinjektionskomponente. Aus 1000 Chargen einer normalen Produktionskampagne eines Stahlwerkes wurden 14 Chargen ausgewählt, die anschließend exakt von 0,05 % [S] auf 0,005 % [S] entschwefelt wurden. Bei einem mittleren Chargengewicht von 210 t lagen die Verbrauche an Entschwefelungsgemisch im Schnitt bei :A desulphurization mixture consisting of uncoated Mg granules with a particle size distribution between 0.1 and 0.8 mm was used as the first co-injection component and calcium carbide with a grain size of <0.1 mm as the second co-injection component. 14 batches were selected from 1000 batches of a normal steel mill production campaign, which were then desulfurized exactly from 0.05% [S] to 0.005% [S]. With a medium one Batch weight of 210 t, the average consumption of desulfurization mixture was:
Mg (1. Koinjektionskomponente) : 70 kg/Charge = 0,33 kg/t Ca-Carbid (2. Koinjektionskomponente) : 335 kg/Charge =Mg (1st co-injection component): 70 kg / batch = 0.33 kg / t Ca carbide (2nd co-injection component): 335 kg / batch =
1,60 kg/t Die Förderrate der 1. Koinjektionskomponente betrug ca. 215 kg- min"1.1.60 kg / t The delivery rate of the 1st co-injection component was approx. 215 kg-min "1 .
Beispiel 2 (Erfindung)Example 2 (Invention)
Im Gegensatz zum Vergleichsversuch betrugen die mittleren Verbrauche an Entschwefelungsgemisch, bei dem die erfindungsgemäße 1. Koinjektionskomponente aus 90 Gew.-% Mg und 10 Gew.-% feinteiliges Ca-Carbid der Körnung < 0,1 mm bestand, für die Koinjektionsbehandlung von 14 Chargen an Roheisenschmelze und bei 206 t durchschnittlichem Chargengewicht für: 90 Gew.-% Mg + 10 Gew.-%: 68 kg/Charge = 0,33 kg/t =In contrast to the comparative experiment, the average consumption of desulfurization mixture, in which the first co-injection component according to the invention consisted of 90% by weight of Mg and 10% by weight of finely divided Ca carbide with a grain size of <0.1 mm, for the co-injection treatment of 14 batches on molten iron and at an average batch weight of 206 t for: 90% by weight Mg + 10% by weight: 68 kg / batch = 0.33 kg / t =
(1. Koinjektionskomponente) 0,3 kg Mg/t(1st co-injection component) 0.3 kg Mg / t
Ca-Carbid : 329 kg/Charge = 1,60 kg/tCa carbide: 329 kg / batch = 1.60 kg / t
(2. Koinjektionskomponente)(2nd co-injection component)
Mit einer zu 10 Gew.-% an Mg reduzierten Mg-Komponente war somit eine gleichwertige Entschwefelungsleistung von 0,05 % [S] auf 0,005 % [S] zu erzielen. Die Förderrate der 1. Koinjektionskomponente betrug 490 kg*min"1. With a Mg component reduced to 10% by weight of Mg, an equivalent desulfurization capacity of 0.05% [S] to 0.005% [S] could be achieved. The delivery rate of the 1st co-injection component was 490 kg * min "1 .

Claims

Patentansprüche claims
1. Entschwefelungsmittel für die Koinjektions-Behandlung von Roheisenschmelzen durch Injektion von Magnesium-Granulat mit einer Korngröße zwischen 0,1 und 0,8 mm und, getrennt davon der zweiten Injektionskomponente, d a d u r c h g e k e n n z e i c h n e t , daß das Magnesium-Granulat 5 bis 20 Gew.-% Calciumcarbid mit einer Körnung ≤ als 0, 1 mm enthält.1. Desulfurization agent for the co-injection treatment of pig iron melts by injection of magnesium granules with a grain size between 0.1 and 0.8 mm and, separately therefrom the second injection component, characterized in that the magnesium granules 5 to 20 wt .-% Contains calcium carbide with a grain size ≤ than 0.1 mm.
2. Mittel nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß das Magnesium-Granulat 8 bis 12 Gew.-% des feinteiligen Calciumcarbids enthält.2. Composition according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the magnesium granules contain 8 to 12 wt .-% of the finely divided calcium carbide.
3. Mittel nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß die Körner des Granulats in umhüllter Form vorliegen.3. Composition according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that the granules of the granules are present in coated form.
4. Mittel nach Anspruch 3, d a d u r c h g e k e n n z e i c h n e t , daß die Hülle der Magnesiumkörner aus organischen StickstoffVerbindungen, insbesondere solchen vom NCN-Typ, besteht.4. Means according to claim 3, d a d u r c h g e k e n n z e i c h n e t that the shell of the magnesium grains consists of organic nitrogen compounds, especially those of the NCN type.
5. Verfahren zum Entschwefeln von Roheisen durch Koinjektion von Magnesium-Granulat mit einer Korngröße von 0,1 bis 0,8 mm und einer zweiten Komponente, wobei diese beiden Komponenten getrennt, pneumatisch gefördert und erst unmittelbar vor dem Einbringen in die Schmelze gemischt werden, d a d u r c h g e k e n n z e i c h n e t , daß man ein Magnesium-Granulat verwendet, welches 5 bis 205. Process for desulphurizing pig iron by co-injecting magnesium granules with a grain size of 0.1 to 0.8 mm and a second component, these two components being separated, pneumatically conveyed and mixed only immediately before being introduced into the melt, characterized in that one uses a magnesium granulate which 5 to 20
Gew.-% Calciumcarbid mit einer Körnung ≤ 0,1 mm enthält.% By weight of calcium carbide with a grain size of ≤ 0.1 mm.
6. Verfahren nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t , daß man ein Magnesium-Granulat verwendet, welches 8 bis 12 Gew.-% des feinteiligen Calciumcarbids enthält.6. The method according to claim 5, characterized in that one uses a magnesium granulate containing 8 to 12 wt .-% of the finely divided calcium carbide.
7. Verfahren nach Anspruch 5 oder 6, d a d u r c h g e k e n n z e i c h n e t , daß das Magnesium-Granulat in umhüllter Form eingesetzt wird.7. The method of claim 5 or 6, d a d u r c h g e k e n n z e i c h n e t that the magnesium granules are used in coated form.
8. Verfahren nach Anspruch 7, d a d u r c h g e k e n n z e i c h n e t , daß ein mit organischen Stickstoffverbindungen, insbesondere solchen vom NCN-Typ umhülltes Magnesium verwendet wird.8. The method according to claim 7, d a d u r c h g e k e n n z e i c h n e t that a magnesium coated with organic nitrogen compounds, in particular those of the NCN type is used.
9. Verfahren nach einem der Ansprüche 5 bis 8, d a d u r c h g e k e n n z e i c h n e t , daß die zweite Koinjektionskomponente aus Calciumcarbid oder Kalk besteht. 9. The method according to any one of claims 5 to 8, so that the second co-injection component consists of calcium carbide or lime.
PCT/EP1996/005515 1995-12-12 1996-12-10 Desulphurating agent for co-injection treatment of pig iron melts WO1997021841A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL96327174A PL185316B1 (en) 1995-12-12 1996-12-10 Desulphurising agent for treating molten crude iron by co-injection
DE59604915T DE59604915D1 (en) 1995-12-12 1996-12-10 DESULFURING AGENT FOR THE COINJECTION TREATMENT OF BODY MELT
EP96943075A EP0866880B1 (en) 1995-12-12 1996-12-10 Desulphurating agent for co-injection treatment of pig iron melts

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DE19546235A DE19546235C2 (en) 1995-12-12 1995-12-12 Desulphurising agent for the co-injection treatment of pig iron melts
DE19546235.1 1995-12-12

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CN1087035C (en) * 1999-11-02 2002-07-03 北京科技大学 Technology for pretreating molten iron inshallow smelting bath by blowing Mg-base desulfurizing agent

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EP0164592A1 (en) * 1984-05-16 1985-12-18 SKW Trostberg Aktiengesellschaft Fine-grained desulfurization agent forron melts, and process for the desulfurization of molten pig iron
DE3831831C1 (en) * 1988-09-20 1989-11-02 Skw Trostberg Ag, 8223 Trostberg, De
FR2688230A1 (en) * 1992-03-05 1993-09-10 Pechiney Electrometallurgie Desulphuriser for pig iron, based on ultrafine magnesium or calcium carbide powders which are agglomerated with a polymeric binder

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Publication number Priority date Publication date Assignee Title
DE2911657A1 (en) * 1978-03-24 1979-10-11 Toyo Soda Mfg Co Ltd ADDITIVE FOR REFINING METALS AND PROCESS FOR ITS MANUFACTURING
EP0164592A1 (en) * 1984-05-16 1985-12-18 SKW Trostberg Aktiengesellschaft Fine-grained desulfurization agent forron melts, and process for the desulfurization of molten pig iron
DE3831831C1 (en) * 1988-09-20 1989-11-02 Skw Trostberg Ag, 8223 Trostberg, De
FR2688230A1 (en) * 1992-03-05 1993-09-10 Pechiney Electrometallurgie Desulphuriser for pig iron, based on ultrafine magnesium or calcium carbide powders which are agglomerated with a polymeric binder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"CO-INJECTION FOR HOT METAL DESULPHURISATION", STEEL TIMES INTERNATIONAL - INCORPORATING IRON & STEEL INTERNATIONAL, vol. 14, no. 3, 1 May 1990 (1990-05-01), REDHILL, SURREY,GB, pages 18, XP000137808 *

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DE19546235C2 (en) 1997-12-11
DE59604915D1 (en) 2000-05-11
EP0866880A1 (en) 1998-09-30
CZ182598A3 (en) 1999-10-13
PL185316B1 (en) 2003-04-30
EP0866880B1 (en) 2000-04-05
DE19546235A1 (en) 1997-06-19
PL327174A1 (en) 1998-11-23

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