EP1498499B1 - An agent for desulfurization of metal melts - Google Patents

An agent for desulfurization of metal melts Download PDF

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Publication number
EP1498499B1
EP1498499B1 EP04450140A EP04450140A EP1498499B1 EP 1498499 B1 EP1498499 B1 EP 1498499B1 EP 04450140 A EP04450140 A EP 04450140A EP 04450140 A EP04450140 A EP 04450140A EP 1498499 B1 EP1498499 B1 EP 1498499B1
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EP
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Prior art keywords
agent
agent according
desulfurization
magnesium
alkaline earth
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German (de)
French (fr)
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EP1498499A1 (en
Inventor
Johann Dipl.-Htl.-Ing. Zimmermann
Michael Dipl.-Ing. Dr. Groschner
Rainer Dipl.-Ing. Dr. Wiesböck
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Donau Chemie AG
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Donau Chemie AG
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C21C7/0645—Agents used for dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C21C1/025—Agents used for dephosphorising or desulfurising

Definitions

  • the invention relates to an agent for the desulfurization of molten metals, in particular pig iron melts, which contains calcium carbide and / or calcium oxide and a carbon-containing compound.
  • desulphurising agents are used to desulfurize pig iron melts, which are introduced into the molten pig iron.
  • the agent is pneumatically injected into the melt with immersion lances using both mono-injection and multiple injection (coinjection).
  • EP 0 226 994 A1 discloses a fine-grained agent for desulfurizing molten iron, which consists of a technical calcium carbide, dried coal with a content of at least 15% by weight of volatile constituents and optionally fine-grained magnesium.
  • the agent described in EP 0 164 592 A1 again consists of a combination of calcium carbide, at least one hydrogen-releasing substance and magnesium.
  • US-A-4,159,906 describes a desulfurizing agent containing calcium carbide or calcium cyanamide and an additive which gives water or hydrogen at the temperature of the molten metal.
  • Preferred additives include alkali metal hydrides, polyethylene or polyamide for hydrogen formation, and a hydrate of lime and alkaline earth borates for water formation.
  • Desulphurization seeks to get by with as little desulphurising agent as possible. It consists m.a.W. the desire to bring as little desulfurizing agent in the molten pig iron and still achieve a high degree of desulfurization.
  • the present invention is based, which has the object to provide a means for the desulfurization of molten metal, in particular pig iron melts of the type mentioned above, which is more efficient than conventional means.
  • This object is achieved with an agent containing calcium carbide and / or calcium oxide and a carbon-containing compound and additionally an alkali and / or an alkaline earth metal phosphate in a total amount of 0.5-10 wt.%.
  • Suitable alkali metal or alkaline earth metal phosphate are ortho and metaphosphates, but also fluorophosphates, in neutral salt form and also as acid salts.
  • naturally occurring phosphates with mineral-typical admixtures such. Apatite, fluorapatite or hydroxyapatite.
  • carbonaceous compound e.g. Coal, urea, hydrocarbons, polyethylene, polyurethane or rubber, preferably in an amount between 0.5 to 15 wt .-%.
  • Particularly preferred is a content of 0.5 to 8 wt .-% of alkali and / or alkaline earth metal phosphate.
  • the desulfurization effect with the agent according to the invention is particularly pronounced if the alkali metal and / or alkaline earth metal phosphate is present in powder form with a grain size of not more than 0.2 mm.
  • the agent according to the invention can furthermore contain metallic magnesium and / or magnesium alloys, the proportion of magnesium and / or magnesium alloys being in particular between 2 and 35% by weight.
  • magnesium and / or magnesium alloys in powder form with a particle size up to 1.0 mm and the other ingredients of the inventive agent in powder form with a grain size of not more than 0.2 mm.
  • the invention further relates to a process for the preparation of the agent according to the invention for the desulfurization of pig iron melts, which process is characterized in that a mixture containing calcium carbide and / or calcium oxide, a carbonaceous compound and the alkali and / or Erdalkaliphospat is ground, whereupon optionally pulverulent Magnesium or a powdered magnesium alloy, each with a particle size up to 1.0 mm, is mixed.
  • the invention relates to the use of the agent according to the invention for the desulfurization of molten metals, in particular pig iron melts.
  • the invention further relates to a process for the production of desulphurised metals, in particular pig iron, and is characterized in that the metal to be desulphurized is melted, whereupon the resulting molten metal is brought into contact with the desulphurising agent according to the invention.
  • the sulfur content was determined to be 22 ppm, resulting in a K value of 1.318.
  • the sulfur content was determined to be 52 ppm, resulting in a K value of 1.588.
  • the mixture was mixed to a particle size in the range of about 0.5 mm with 2% metallic magnesium powder of the same particle size.
  • the sulfur content was determined to be 40 ppm, resulting in a K value of 0.930.
  • the mixture was mixed to a particle size in the range of about 0.5 mm with 2% metallic magnesium powder of the same particle size.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Glass Compositions (AREA)

Abstract

The agent also contains an alkaline- and/or alkaline earth phosphate. An independent claim is included for the corresponding method.

Description

Die Erfindung betrifft ein Mittel zur Entschwefelung von Metallschmelzen, insbesondere Roheisenschmelzen, welches Mittel Calciumcarbid und/oder Calciumoxid sowie eine kohlenstoffhaltige Verbindung enthält.The invention relates to an agent for the desulfurization of molten metals, in particular pig iron melts, which contains calcium carbide and / or calcium oxide and a carbon-containing compound.

In europäischen und amerikanischen Stahlwerken werden zur Entschwefelung von Roheisenschmelzen Entschwefelungsmittel verwendet, die in das flüssige Roheisen eingebracht werden. Dazu wird das Mittel mit Eintauchlanzen pneumatisch in die Schmelze eingeblasen, wobei sowohl Monoinjektion als auch Mehrfachinjektion (Koinjektion) angewendet wird.In European and American steel mills desulphurising agents are used to desulfurize pig iron melts, which are introduced into the molten pig iron. For this purpose, the agent is pneumatically injected into the melt with immersion lances using both mono-injection and multiple injection (coinjection).

Mittel zur Entschwefelung von Metallschmelzen auf Basis von Calciumcarbid und/oder Calciumoxid sind bekannt. Die DE 39 08 071 A1 beschreibt derartige Mittel auf Basis von im Schmelzfluß gewonnenen CaC2-CaO-Kristallgemengen mit maximal 62% CaC2, gasabspaltenden Substanzen und bis zu 44% metallischem Magnesium.Agents for the desulfurization of metal melts based on calcium carbide and / or calcium oxide are known. DE 39 08 071 A1 describes such agents based on CaC 2 -CaO crystal mixtures obtained by melt flow with a maximum of 62% CaC 2 , gas-releasing substances and up to 44% metallic magnesium.

Aus der EP 0 226 994 A1 ist ein feinkörniges Mittel zum Entschwefeln von Eisenschmelzen bekannt, welches aus einem technischen Calciumcarbid, getrockneter Kohle mit einem Gehalt von mindestens 15 Gew.-% flüchtigen Bestandteilen und gegebenenfalls feinkörnigem Magnesium besteht.EP 0 226 994 A1 discloses a fine-grained agent for desulfurizing molten iron, which consists of a technical calcium carbide, dried coal with a content of at least 15% by weight of volatile constituents and optionally fine-grained magnesium.

Das in der EP 0 164 592 A1 beschriebene Mittel besteht wiederum aus einer Kombination von Calciumcarbid, wenigstens einer Wasserstoff-abspaltenden Substanz und Magnesium.The agent described in EP 0 164 592 A1 again consists of a combination of calcium carbide, at least one hydrogen-releasing substance and magnesium.

Die US-A - 4,159,906 beschreibt ein Entschwefelungsmittel, welches Calciumcarbid oder Calciumcyanamid und ein Additiv enthält, welches bei der Temperatur des geschmolzenen Metalls Wasser oder Wasserstoff ergibt. Als bevorzugte Additive werden Alkalimetallhydride, Polyethylen oder Polyamid für die Wasserstoffbildung, und ein Hydrat aus Kalk und Erdalkaliboraten für die Wasserbildung genannt.US-A-4,159,906 describes a desulfurizing agent containing calcium carbide or calcium cyanamide and an additive which gives water or hydrogen at the temperature of the molten metal. Preferred additives include alkali metal hydrides, polyethylene or polyamide for hydrogen formation, and a hydrate of lime and alkaline earth borates for water formation.

Ein weiteres Verfahren zur Behandlung von Roheisenschmelzen zu deren Entschwefelung ist aus der EP 0 530 552 A1 bekannt. Dazu werden in die Schmelze in der Anfangsphase Feststoffe eingeblasen, die die Anfangsschlacke desoxidieren und ihre Basizität erhöhen. In der mittleren Phase wird ein Entschwefelungsmittel zur Hauptentschwefelung eingeblasen, und in der Schlussphase werden solche Feststoffe eingeblasen, die die Schmelze reinigen und die Schlussentschwefelung bewirken.Another method for the treatment of pig iron melts for their desulfurization is known from EP 0 530 552 A1. For this purpose, solids are blown into the melt in the initial phase, which deoxidize the initial slag and increase its basicity. In the middle phase, a desulphurizer is blown into the main desulphurisation, and in the final stage, those solids are blown in which purify the melt and bring about final desulphurisation.

Bei der Entschwefelung ist man bestrebt, mit möglichst wenig Entschwefelungsmittel auszukommen. Es besteht m.a.W. das Bestreben, möglichst wenig Entschwefelungsmittel in die Roheisenschmelze einzubringen und dennoch einen hohen Entschwefelungsgrad zu erreichen.Desulphurization seeks to get by with as little desulphurising agent as possible. It consists m.a.W. the desire to bring as little desulfurizing agent in the molten pig iron and still achieve a high degree of desulfurization.

Hier setzt nun die vorliegende Erfindung an, die sich die Aufgabe stellt, ein Mittel zur Entschwefelung von Metallschmelzen, insbesondere Roheisenschmelzen der eingangs erwähnten Art zur Verfügung zu stellen, welches effizienter als herkömmliche Mittel ist.This is where the present invention is based, which has the object to provide a means for the desulfurization of molten metal, in particular pig iron melts of the type mentioned above, which is more efficient than conventional means.

Diese Aufgabe wird mit einem Mittel erreicht, welches Calciumcarbid und/oder Calciumoxid sowie eine kohlenstoffhaltige Verbindung und zusätzlich ein Alkali- und/oder ein Erdalkaliphosphat in einer Menge von insgesamt 0.5-10 Gew.% enthält.This object is achieved with an agent containing calcium carbide and / or calcium oxide and a carbon-containing compound and additionally an alkali and / or an alkaline earth metal phosphate in a total amount of 0.5-10 wt.%.

Als Alkali- bzw. Erdalkaliphosphat eignen sich Ortho- und Metaphosphate, aber auch Fluorphospate, und zwar in Neutralsalzform und auch als saure Salze. Es hat sich gezeigt, dass sich aber auch natürlich vorkommende Phosphate mit mineraltypischen Beimengungen, wie z.B. Apatit, Fluorapatit oder Hydroxylapatit, eignen.Suitable alkali metal or alkaline earth metal phosphate are ortho and metaphosphates, but also fluorophosphates, in neutral salt form and also as acid salts. However, it has been found that naturally occurring phosphates with mineral-typical admixtures, such. Apatite, fluorapatite or hydroxyapatite.

Als kohlenstoffhaltige Verbindung eignen sich z.B. Kohle, Harnstoff, Kohlenwasserstoffe, Polyethylen, Polyurethan oder Gummi, und zwar bevorzugt in einer Menge zwischen 0,5 bis 15 Gew.-%.As the carbonaceous compound, e.g. Coal, urea, hydrocarbons, polyethylene, polyurethane or rubber, preferably in an amount between 0.5 to 15 wt .-%.

Besonders bevorzugt ist ein Gehalt von 0,5 bis 8 Gew.-% an Alkali- und/oder Erdalkaliphosphat.Particularly preferred is a content of 0.5 to 8 wt .-% of alkali and / or alkaline earth metal phosphate.

Die Entschwefelungswirkung mit dem erfindungsgemäßen Mittel ist dann besonders ausgeprägt, wenn das Alkali- und/oder das Erdalkaliphosphat in Pulverform mit einer Korngröße von maximal 0,2 mm vorliegt.The desulfurization effect with the agent according to the invention is particularly pronounced if the alkali metal and / or alkaline earth metal phosphate is present in powder form with a grain size of not more than 0.2 mm.

Das erfindungsgemäße Mittel kann ferner metallisches Magnesium und/oder Magnesiumlegierungen enthalten, wobei der Anteil an Magnesium und/oder Magnesiumlegierungen insbesondere zwischen 2 und 35 Gew.-% liegt.The agent according to the invention can furthermore contain metallic magnesium and / or magnesium alloys, the proportion of magnesium and / or magnesium alloys being in particular between 2 and 35% by weight.

Insbesondere bevorzugt ist, wenn das Magnesium und/oder die Magnesiumlegierungen in Pulverform mit einer Korngröße bis 1,0 mm und die anderen Inhaltsstoffe des erfindungsgemäßen Mittels in Pulverform mit einer Korngröße von maximal 0,2 mm vorliegen.Particularly preferred is when the magnesium and / or magnesium alloys in powder form with a particle size up to 1.0 mm and the other ingredients of the inventive agent in powder form with a grain size of not more than 0.2 mm.

Die Erfindung betrifft ferner ein Verfahren zur Herstellung des erfindungsgemäßen Mittels zur Entschwefelung von Roheisenschmelzen, welches Verfahren dadurch gekennzeichnet ist, dass ein Gemisch enthaltend Calciumcarbid und/oder Calciumoxid, eine kohlenstoffhaltige Verbindung sowie das Alkali- und/oder das Erdalkaliphospat vermahlen wird, worauf gegebenenfalls pulverförmiges Magnesium oder eine pulverförmige Magnesiumlegierung, jeweils mit einer Korngröße bis 1,0 mm, eingemischt wird.The invention further relates to a process for the preparation of the agent according to the invention for the desulfurization of pig iron melts, which process is characterized in that a mixture containing calcium carbide and / or calcium oxide, a carbonaceous compound and the alkali and / or Erdalkaliphospat is ground, whereupon optionally pulverulent Magnesium or a powdered magnesium alloy, each with a particle size up to 1.0 mm, is mixed.

Darüberhinaus betrifft die Erfindung die Verwendung des erfindungsgemäßen Mittels zur Entschwefelung von Metallschmelzen, insbesondere Roheisenschmelzen.Moreover, the invention relates to the use of the agent according to the invention for the desulfurization of molten metals, in particular pig iron melts.

Die Erfindung betrifft darüber hinaus ein Verfahren zur Herstellung von entschwefelten Metallen, insbesondere Roheisen, und ist dadurch gekennzeichnet, dass das zu entschwefelnde Metall geschmolzen wird, worauf die erhaltene Metallschmelze mit dem erfindungsgemäßen Entschwefelungsmittel in Kontakt gebracht wird.The invention further relates to a process for the production of desulphurised metals, in particular pig iron, and is characterized in that the metal to be desulphurized is melted, whereupon the resulting molten metal is brought into contact with the desulphurising agent according to the invention.

Mit den nachfolgenden Beispielen werden bevorzugte Ausführungsformen der vorliegenden Erfindung noch näher erläutert.With the following examples, preferred embodiments of the present invention will be explained in more detail.

Zur Bewertung des erzielten Entschwefelungsgrades wurde der sogenannte K-Wert herangezogen, der sich folgendermaßen errechnet: K ⁢ =   kg ⁢   Entschwefelungsmittel / ( t ⁢   Roheisen ⁢   x ⁢   ln ⁢   ( SA / SE ) )

Figure imgb0001

  • SA = Anfangsgehalt Schwefel (in ppm) im Roheisen
  • SE = Endgehalt Schwefel (in ppm) im Roheisen
To evaluate the degree of desulfurization achieved, the so-called K value was used, which is calculated as follows: K ⁢ = kg ⁢ desulfurization / ( t ⁢ pig-iron ⁢ x ⁢ ln ⁢ ( SA / SE ) )
Figure imgb0001
  • SA = initial sulfur content (in ppm) in pig iron
  • SE = final sulfur content (in ppm) in pig iron

Es wurde somit zuerst der Schwefelgehalt im unbehandelten Roheisen in ppm bestimmt (= SA), dann das Roheisen entschwefelt und danach wieder der Schwefelgehalt (= Endgehalt SE) bestimmt, worauf der K-Wert gemäß obiger Formel errechnet wurde.Thus, the sulfur content in untreated pig iron was first determined in ppm (= SA), then the pig iron was desulfurized and then the sulfur content (= final content SE) was determined again, whereupon the K value was calculated according to the above formula.

Bei der Verwendung des erfindungsgemäßen Entschwefelungsmittels ergab sich unter vergleichbaren Bedingungen ein geringerer K-Wert, dessen Absenkung in den nachfolgenden Beispielen in % errechnet wurde und als Maß für die verbesserte Entschwefelung zu werten ist.When using the desulfurizing agent according to the invention resulted in comparable conditions, a lower K value, the reduction was calculated in% in the following examples and is to be regarded as a measure of the improved desulfurization.

Beispiel 1example 1

Es wurde eine Pfannenentschwefelung mittels Monoinjektion durchgeführt. Dazu wurden 142 t Roheisenschmelze enthaltend 463 ppm Schwefel mit 570 kg erfindungsgemäßem Entschwefelungsmittel behandelt, wobei das Entschwefelungsmittel folgende Zusammensetzung aufwies:

  • 90% technisches Carbid enthaltend 77,5 % CaC2
  • 6% technisches Calciumoxid enthalten 94 % CaO
  • 1% Kohle
  • 1% Harnstoff
  • 2% Phosphat (Gemisch aus Alkali- und Erdalkaliphosphat)
A pan desulfurization was performed by monoinjection. For this purpose, 142 tons of pig iron melt containing 463 ppm sulfur were treated with 570 kg desulphurising agent according to the invention, the desulphurising agent having the following composition:
  • 90% technical carbide containing 77.5% CaC 2
  • 6% technical grade calcium oxide contains 94% CaO
  • 1% coal
  • 1% urea
  • 2% phosphate (mixture of alkali and alkaline earth phosphate)

Nach Entschwefelung mit dem erfindungsgemäßen Mittel wurde der Schwefelgehalt mit 22 ppm bestimmt, woraus sich ein K-Wert von 1,318 ergibt.After desulfurization with the agent according to the invention, the sulfur content was determined to be 22 ppm, resulting in a K value of 1.318.

Vergleichsbeispiel 1Comparative Example 1

Es wurde analog Beispiel 1 vorgegangen, wobei jedoch statt des erfindungsgemäßen Entschwefelungsmittels folgendes Mittel eingesetzt wurde:

  • 90% technisches Carbid enthaltend 77,5 % CaC2
  • 7% technisches Calciumoxid enthalten 94 % CaO
  • 2% Kohle
  • 1% Harnstoff
The procedure was analogous to Example 1, except that instead of the desulfurization agent according to the invention the following agent was used:
  • 90% technical carbide containing 77.5% CaC 2
  • 7% technical calcium oxide contains 94% CaO
  • 2% coal
  • 1% urea

Nach Entschwefelung mit dem obigen Mittel wurde der Schwefelgehalt mit 25 ppm bestimmt, woraus sich ein K-Wert von 1,375 ergibt.After desulfurization with the above agent, the sulfur content was determined to be 25 ppm, giving a K value of 1.375.

Durch Vergleich mit dem Beispiel 1 kann errechnet werden, dass sich der K-Wert durch Einsatz des erfindungsgemäßen Mittels um 4,2 % absenken ließ.By comparison with Example 1 it can be calculated that the K value could be lowered by 4.2% by using the agent according to the invention.

Beispiel 2Example 2

Es wurde eine Torpedoentschwefelung mittels Monoinjektion durchgeführt. Dazu wurden 381 t Roheisenschmelze enthaltend 250 ppm Schwefel mit 950 kg erfindungsgemäßem Entschwefelungsmittel behandelt, wobei das Entschwefelungsmittel folgende Zusammensetzung aufwies:

  • 95% technisches Calciumoxid enthaltend 94 % CaO
  • 2% Kohle
  • 1% Harnstoff
  • 2% Phosphat (Erdalkaliphosphat, u.zw. ein Gemisch aus Apatit und Fluorapatit)
Torpedo desulphurisation was carried out by mono-injection. For this purpose, 381 tons of pig iron melt containing 250 ppm sulfur with 950 kg inventive Treated desulphurising agent, wherein the desulfurizing agent had the following composition:
  • 95% technical calcium oxide containing 94% CaO
  • 2% coal
  • 1% urea
  • 2% phosphate (alkaline earth phosphate, including a mixture of apatite and fluorapatite)

Nach Entschwefelung mit dem erfindungsgemäßen Mittel wurde der Schwefelgehalt mit 52 ppm bestimmt, woraus sich ein K-Wert von 1,588 ergibt.After desulfurization with the agent according to the invention, the sulfur content was determined to be 52 ppm, resulting in a K value of 1.588.

Vergleichsbeispiel 2Comparative Example 2

Es wurde analog Beispiel 2 vorgegangen, wobei jedoch statt des erfindungsgemäßen Entschwefelungsmittels folgendes Mittel eingesetzt wurde:

  • 95% technisches Calciumoxid enthalten 94 % CaO
  • 3% Kohle
  • 2% Harnstoff
The procedure was analogous to Example 2, but instead of the desulfurization agent according to the invention the following agent was used:
  • 95% technical grade calcium oxide contains 94% CaO
  • 3% coal
  • 2% urea

Nach Entschwefelung mit dem obigen Mittel wurde der Schwefelgehalt mit 56 ppm bestimmt, woraus sich ein K-Wert von 1,667 ergibt.After desulfurization with the above agent, the sulfur content was determined to be 56 ppm, resulting in a K value of 1.667.

Durch Vergleich mit dem Beispiel 2 kann errechnet werden, dass sich der K-Wert durch Einsatz des erfindungsgemäßen Mittels um 4,7 % absenken ließ.By comparison with Example 2 it can be calculated that the K value could be lowered by 4.7% by using the agent according to the invention.

Beispiel 3Example 3

Es wurde eine Torpedoentschwefelung mittels Monoinjektion durchgeführt. Dazu wurden 158 t Roheisenschmelze enthaltend 260 ppm Schwefel mit 275 kg erfindungsgemäßem Entschwefelungsmittel behandelt, wobei das Entschwefelungsmittel folgende Zusammensetzung aufwies:

  • 88% technisches Carbid enthaltend 77,5 % CaC2
  • 1% technisches Calciumoxid enthalten 94 % CaO
  • 2% Kohle
  • 1% Harnstoff
  • 8% Phosphat (Erdalkaliphosphat, u.zw. Gemisch aus Fluorapatit und Hydroxylapatit)
Torpedo desulphurisation was carried out by mono-injection. For this purpose, 158 tons of pig iron melt containing 260 ppm of sulfur were treated with 275 kg of desulphurising agent according to the invention, the desulphurising agent having the following composition:
  • 88% technical carbide containing 77.5% CaC 2
  • 1% technical calcium oxide contains 94% CaO
  • 2% coal
  • 1% urea
  • 8% phosphate (alkaline earth phosphate, including a mixture of fluorapatite and hydroxyapatite)

Das Gemisch wurde auf eine Teilchengröße im Bereich von ca. 0,5 mm mit 2 % metallischem Magnesiumpulver derselben Teilchengröße vermischt.The mixture was mixed to a particle size in the range of about 0.5 mm with 2% metallic magnesium powder of the same particle size.

Nach Entschwefelung mit dem erfindungsgemäßen Mittel wurde der Schwefelgehalt mit 40 ppm bestimmt, woraus sich ein K-Wert von 0,930 ergibt.After desulfurization with the agent according to the invention, the sulfur content was determined to be 40 ppm, resulting in a K value of 0.930.

Vergleichsbeispiel 3Comparative Example 3

Es wurde analog Beispiel 3 vorgegangen, wobei jedoch statt des erfindungsgemäßen Entschwefelungsmittels folgendes Mittel eingesetzt wurde:

  • 88% technisches Carbid enthaltend 77,5 % CaC2
  • 7% technisches Calciumoxid enthalten 94 % CaO
  • 4% Kohle
  • 1% Harnstoff
The procedure was analogous to Example 3, except that instead of the desulfurization agent according to the invention the following agent was used:
  • 88% technical carbide containing 77.5% CaC 2
  • 7% technical calcium oxide contains 94% CaO
  • 4% coal
  • 1% urea

Das Gemisch wurde auf eine Teilchengröße im Bereich von ca. 0,5 mm mit 2 % metallischem Magnesiumpulver derselben Teilchengröße vermischt.The mixture was mixed to a particle size in the range of about 0.5 mm with 2% metallic magnesium powder of the same particle size.

Nach Entschwefelung mit dem obigen Mittel wurde der Schwefelgehalt mit 47 ppm bestimmt, woraus sich ein K-Wert von 1,018 ergibt.After desulfurization with the above agent, the sulfur content was determined to be 47 ppm, resulting in a K value of 1.018.

Durch Vergleich mit dem Beispiel 3 kann errechnet werden, dass sich der K-Wert durch Einsatz des erfindungsgemäßen Mittels um 8,6 % absenken ließ.By comparison with Example 3 it can be calculated that the K value could be lowered by 8.6% by using the agent according to the invention.

Claims (11)

  1. An agent for the desulfurization of metal melts, in particular of pig iron melts, which agent comprises calcium carbide and/or calcium oxide as well as a carbonaceous compound,
    characterized in that
    it comprises an alkali and/or an alkaline earth phosphate in a total amount of from 0.5 to 10% by weight.
  2. An agent according to claim 1, characterized in that the alkali and/or the alkaline earth phosphate is contained in a total amount of up to 10% by weight.
  3. An agent according to claim 2, characterized in that the alkali and/or the alkaline earth phosphate is contained in an amount of from 0.5 to 8% by weight.
  4. An agent according to any of claims 1 to 3, characterized in that the alkali and/or the alkaline earth phosphate is provided in the form of a powder having a maximum grain size of 0.2 mm.
  5. An agent according to any of claims 1 to 4, characterized in that it comprises metallic magnesium and/or magnesium alloys.
  6. An agent according to claim 5, characterized in that the amount of magnesium and/or magnesium alloys ranges between 2 and 35% by weight.
  7. An agent according to any of claims 1 to 7, characterized in that the magnesium and/or the magnesium alloys is/are provided in the form of a powder having a grain size of up to 1.0 mm and the other ingredients are provided in the form of a powder having a maximum grain size of 0.2 mm.
  8. A process for the production of an agent for the desulfurization of pig iron melts according to any of claims 1 to 7, characterized in that a mixture containing calcium carbide and/or calcium oxide, a carbonaceous compound as well as the alkali and/or the alkaline earth phosphate is ground, whereupon powdery magnesium or a powdery magnesium alloy, in each case having a grain size of up to 1.0 mm, is optionally admixed.
  9. The use of an agent according to any of claims 1 to 7 for the desulfurization of metal melts, in particular pig iron melts.
  10. A process for the production of desulfurized metals, characterized in that the metal to be desulfurized is melted, whereupon the metal melt obtained is contacted with a desulfurizing agent according to any of claims 1 to 7.
  11. A process according to claim 10, characterized in that a pig iron melt is used as the metal melt.
EP04450140A 2003-07-14 2004-07-07 An agent for desulfurization of metal melts Expired - Lifetime EP1498499B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT04450140T ATE339526T1 (en) 2003-07-14 2004-07-07 AGENT FOR DESULPHURIZING METAL MELTS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0108003A AT412477B (en) 2003-07-14 2003-07-14 MEANS FOR DEHUMIDIFICATION OF METAL MELTS
AT10802003 2003-07-14

Publications (2)

Publication Number Publication Date
EP1498499A1 EP1498499A1 (en) 2005-01-19
EP1498499B1 true EP1498499B1 (en) 2006-09-13

Family

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EP04450140A Expired - Lifetime EP1498499B1 (en) 2003-07-14 2004-07-07 An agent for desulfurization of metal melts

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EP (1) EP1498499B1 (en)
AT (2) AT412477B (en)
DE (1) DE502004001452D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011116501C5 (en) * 2011-10-20 2018-05-24 Almamet Gmbh Bitumen-containing desulphurising agent

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1201506B (en) * 1985-12-03 1989-02-02 Giovanni Crespi DARK MIXTURE FOR STEEL STAINLESS STEEL IN ARC OVENS, OXYGEN OVENS TYPE LD, O.B.M., KALDO AND OTHER SIMILARS
DE4226833A1 (en) * 1992-08-13 1994-02-17 Alfred Dr Freissmuth Desulphurising agent for pig iron and cast iron
DE4242328C2 (en) * 1992-12-15 1995-06-08 Alfred Dipl Ing Dr Freissmuth Means for desulfurization, dephosphorization, desiliconization and denitrification of pig iron and cast iron melts
ATA115194A (en) * 1994-06-08 1997-07-15 Donau Chemie Ag DESULFURING AGENT FOR BODY IRON AND CAST IRON MELTING
AT406690B (en) * 1994-12-09 2000-07-25 Donau Chemie Ag AGENT FOR TREATING RAW IRON AND CAST IRON MELT FOR THE PURPOSE OF DESULFURATION
DE19833037A1 (en) * 1998-07-22 2000-01-27 Krupp Polysius Ag Process for the desulfurization of a pig iron melt

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011116501C5 (en) * 2011-10-20 2018-05-24 Almamet Gmbh Bitumen-containing desulphurising agent

Also Published As

Publication number Publication date
ATE339526T1 (en) 2006-10-15
EP1498499A1 (en) 2005-01-19
DE502004001452D1 (en) 2006-10-26
AT412477B (en) 2005-03-25
ATA10802003A (en) 2004-08-15

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