EP1498499B1 - Agent de désulfuration de fontes metaux - Google Patents

Agent de désulfuration de fontes metaux 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
Authority
EP
European Patent Office
Prior art keywords
agent
agent according
desulfurization
magnesium
alkaline earth
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.)
Active
Application number
EP04450140A
Other languages
German (de)
English (en)
Other versions
EP1498499A1 (fr
Inventor
Johann Dipl.-Htl.-Ing. Zimmermann
Michael Dipl.-Ing. Dr. Groschner
Rainer Dipl.-Ing. Dr. Wiesböck
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.)
Donau Chemie AG
Original Assignee
Donau Chemie AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Donau Chemie AG filed Critical Donau Chemie AG
Priority to AT04450140T priority Critical patent/ATE339526T1/de
Publication of EP1498499A1 publication Critical patent/EP1498499A1/fr
Application granted granted Critical
Publication of EP1498499B1 publication Critical patent/EP1498499B1/fr
Active legal-status Critical Current
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • 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.

Landscapes

  • 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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Glass Compositions (AREA)

Claims (11)

  1. Agent de désulfuration de fontes métalliques, en particulier de fontes de fer brut, ledit agent comprenant du carbure de calcium et/ou de l'oxyde de calcium ainsi qu'un composé carboné,
    caractérisé en ce que
    il comprend un phosphate alcalin et/ou alcalino-terreux en une quantité de 0,5 à 10 % en poids au total.
  2. Agent selon la revendication 1, caractérisé en ce que le phosphate alcalin et/ou alcalino-terreux est présent en une quantité allant jusqu'à 10 % en poids au total.
  3. Agent selon la revendication 2, caractérisé en ce que le phosphate alcalin et/ou alcalino-terreux est présent en une quantité de 0,5 à 8 % en poids au total.
  4. Agent selon l'une des revendications 1 à 3, caractérisé en ce que le phosphate alcalin et/ou alcalino-terreux est présent sous forme pulvérulente avec une granulométrie d'au maximum 0,2 mm.
  5. Agent selon l'une des revendications 1 à 4, caractérisé en ce qu'il comprend du magnésium métallique et/ou des alliages de magnésium.
  6. Agent selon la revendication 5, caractérisé en ce que la proportion de magnésium et/ou d'alliages de magnésium se situe entre 2 et 35 % en poids.
  7. Agent selon l'une des revendications 1 à 7, caractérisé en ce que le magnésium et/ou les alliages de magnésium se présentent sous une forme pulvérulente avec une granulométrie allant jusqu'à 1,0 mm et les autres ingrédients se présentent sous une forme pulvérulente avec une granulométrie d'au maximum 0,2 mm.
  8. Procédé de fabrication d'un agent de désulfuration des fontes de fer brut selon l'une des revendications 1 à 7, caractérisé en ce qu'un mélange contenant du carbure de calcium et/ou de l'oxyde de calcium, un composé carboné ainsi que le phosphate alcalin et/ou alcalino-terreux est broyé, à la suite de quoi, le cas échéant, du magnésium pulvérulent ou un alliage de magnésium pulvérulent, ayant respectivement une granulométrie allant jusqu'à 1,0 mm, y est incorporé.
  9. Utilisation d'un agent selon l'une des revendications 1 à 7 pour la désulfuration des fontes métalliques, en particulier des fontes de fer brut.
  10. Procédé de fabrication de métaux désulfurés, caractérisé en ce que le métal à désulfurer est fondu, à la suite de quoi la fonte métallique obtenue est mise en contact avec un agent de désulfuration selon l'une des revendications 1 à 7.
  11. Procédé selon la revendication 10, caractérisé en ce que l'on met en oeuvre à titre de fonte métallique une fonte de fer brut.
EP04450140A 2003-07-14 2004-07-07 Agent de désulfuration de fontes metaux Active EP1498499B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT04450140T ATE339526T1 (de) 2003-07-14 2004-07-07 Mittel zur entschwefelung von metallschmelzen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0108003A AT412477B (de) 2003-07-14 2003-07-14 Mittel zur entschwefelung von metallschmelzen
AT10802003 2003-07-14

Publications (2)

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

Family

ID=32831430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04450140A Active EP1498499B1 (fr) 2003-07-14 2004-07-07 Agent de désulfuration de fontes metaux

Country Status (3)

Country Link
EP (1) EP1498499B1 (fr)
AT (2) AT412477B (fr)
DE (1) DE502004001452D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011116501C5 (de) * 2011-10-20 2018-05-24 Almamet Gmbh Bitumen enthaltendes Entschwefelungsmittel

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1201506B (it) * 1985-12-03 1989-02-02 Giovanni Crespi Miscela fondente per scorie d'acciaierie in forni ad arco,forni a ossigeno tipo ld, o.b.m.,kaldo e altri similari
DE4226833A1 (de) * 1992-08-13 1994-02-17 Alfred Dr Freissmuth Entschwefelungsmittel für Roheisen und Gußeisen
DE4242328C2 (de) * 1992-12-15 1995-06-08 Alfred Dipl Ing Dr Freissmuth Mittel zur Entschwefelung, Entphosphorung, Entsilicierung und Entstickung von Roheisen- und Gußeisenschmelzen
ATA115194A (de) * 1994-06-08 1997-07-15 Donau Chemie Ag Entschwefelungsmittel für roheisen- und gusseisenschmelzen
AT406690B (de) * 1994-12-09 2000-07-25 Donau Chemie Ag Mittel zur behandlung von roheisen- und gusseisenschmelzen zum zweck der entschwefelung
DE19833037A1 (de) * 1998-07-22 2000-01-27 Krupp Polysius Ag Verfahren zum Entschwefeln einer Roheisenschmelze

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011116501C5 (de) * 2011-10-20 2018-05-24 Almamet Gmbh Bitumen enthaltendes Entschwefelungsmittel

Also Published As

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

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