EP0220522A1 - Mélange désulfurant pour bains métalliques, son procédé de fabrication et son utilisation - Google Patents

Mélange désulfurant pour bains métalliques, son procédé de fabrication et son utilisation Download PDF

Info

Publication number
EP0220522A1
EP0220522A1 EP86113501A EP86113501A EP0220522A1 EP 0220522 A1 EP0220522 A1 EP 0220522A1 EP 86113501 A EP86113501 A EP 86113501A EP 86113501 A EP86113501 A EP 86113501A EP 0220522 A1 EP0220522 A1 EP 0220522A1
Authority
EP
European Patent Office
Prior art keywords
desulfurization
mixture according
percent
desulfurization mixture
mixture
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.)
Granted
Application number
EP86113501A
Other languages
German (de)
English (en)
Other versions
EP0220522B1 (fr
Inventor
Hermann Dr. Schrödter
Albert Braun
Friedrich-Wilhelm Dr. Kampmann
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.)
Hoechst AG
Original Assignee
Hoechst 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 Hoechst AG filed Critical Hoechst AG
Priority to AT86113501T priority Critical patent/ATE48652T1/de
Publication of EP0220522A1 publication Critical patent/EP0220522A1/fr
Application granted granted Critical
Publication of EP0220522B1 publication Critical patent/EP0220522B1/fr
Expired legal-status Critical Current

Links

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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C21C1/025—Agents used for dephosphorising or desulfurising

Definitions

  • the present invention relates to a desulfurization mixture for molten metals based on calcium carbide, calcium oxide, alkaline earth carbonate, aluminum oxide, chemically unbound carbon and optionally alkali carbonate, a process for its preparation and its use.
  • DE-PS 20 37 758 describes a special calcium carbide in which a mixture of burnt lime and fluorspar is introduced into the calcium carbide melt and then the solidified calcium carbide is crushed.
  • the disadvantage of this process was that only about 2/3 of the fluorine used remained in the melt.
  • DE-PS 26 42 838 describes a process for desulfurizing steel, in which a mixture of calcium carbide with 5 to 25 percent by weight calcium fluoride is added to the metal melt under reduced pressure. It has been shown that this mixture is not suitable for dosing via a submersible lance, since caking occurs in the lance during the blowing process. In addition, slag incrustations form on the pan walls. This desulfurization mixture can be used successfully if there is no slag on the metal bath at first.
  • the object of the present invention is to produce a desulfurization mixture which has a high degree of desulfurization in metals, in particular in iron melts such as pig iron, cast iron and steel melts, with the formation of a crumbly slag and allows perfect metering via an immersion lance.
  • a process is also to be specified which allows the production of this desulfurization mixture without the formation of fluoride-containing exhaust gases.
  • the desulfurization mixture should be able to be brought into contact with the liquid metal without any problems by blowing.
  • the desulfurization mixture according to the invention consists in particular of A preferred desulfurization mixture results if it contains 0.25 to 1.7 percent by weight of fluorine, which is preferably introduced as fluorspar, and if an industrial carbide with a CaC 2 content of 20 to 80 percent by weight is used.
  • the content of pure CaC 2 in the carbide furnace is set, or the content of pure CaC 2 in the liquid phase in the crucible is adjusted by lean with quicklime or the content of pure CaC 2 in the carbide furnace is rough adjusted and then finally adjusted in the liquid phase in the crucible by adding quicklime.
  • the desulfurization mixture according to the invention can contain up to 30 percent by weight of alkali carbonate, preferably in the form of anhydrous soda.
  • the starting materials should have a grain size of 0.1 to 50 mm, preferably 0.2 to 20 mm, as a homogeneous mixture by grinding in a mill under a dry inert gas atmosphere to a size of ⁇ 0.5 mm are ground and the ground material has an average residence time of 3 to 30, preferably 10 to 20 minutes in the mill.
  • the grinding process is of great importance for the production of an optimal mixture with regard to flowability and desulfurization.
  • a preferred embodiment of the process according to the invention is obtained if at least 85% by weight of the end product is ground to a grain size of ⁇ 0.1 mm by the grinding process, since this desulphurization mixture can then be added to the liquid metal in an amount of 0.5 to 5. 0 kg / t metal can be blown in with a carrier gas via a submersible lance.
  • the desulfurization mixture does not cause caking, neither in the lance nor in its feed pipes. It has also been shown that there is no slag encrustation on the metal when using the desulfurization mixture pan wall comes.
  • the emission of undesired fluoride emissions during the desulfurization process is significantly lower compared to a calcium carbide / calcium fluoride mixture produced in the usual ways.
  • the sulfur content was reduced from 0.024 to 0.0025 percent S.
  • the sulfur content was reduced from 0.025 to 0.0007 percent S.

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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
EP86113501A 1985-10-03 1986-10-01 Mélange désulfurant pour bains métalliques, son procédé de fabrication et son utilisation Expired EP0220522B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86113501T ATE48652T1 (de) 1985-10-03 1986-10-01 Entschwefelungsgemisch fuer metallschmelzen, ein verfahren zu seiner herstellung und seine verwendung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3535280 1985-10-03
DE19853535280 DE3535280A1 (de) 1985-10-03 1985-10-03 Entschwefelungsgemisch fuer metallschmelzen, ein verfahren zu seiner herstellung und seine verwendung

Publications (2)

Publication Number Publication Date
EP0220522A1 true EP0220522A1 (fr) 1987-05-06
EP0220522B1 EP0220522B1 (fr) 1989-12-13

Family

ID=6282637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113501A Expired EP0220522B1 (fr) 1985-10-03 1986-10-01 Mélange désulfurant pour bains métalliques, son procédé de fabrication et son utilisation

Country Status (9)

Country Link
US (1) US4687512A (fr)
EP (1) EP0220522B1 (fr)
JP (1) JPH0733534B2 (fr)
AT (1) ATE48652T1 (fr)
DD (1) DD249922A5 (fr)
DE (2) DE3535280A1 (fr)
ES (1) ES2012038B3 (fr)
IN (1) IN167748B (fr)
PL (1) PL146624B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0511121A1 (fr) * 1991-04-02 1992-10-28 Pechiney Electrometallurgie Désulfurant pour fonte constitué de carbure de calcium et de liant organique
FR2679256A1 (fr) * 1991-07-18 1993-01-22 Pechiney Electrometallurgie Desulfurant pour fonte liquide a base de carbure de calcium agglomere.

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR8606249A (pt) * 1985-12-17 1987-09-29 Sueddeutsche Kalkstickstoff Composicao finamente granulada para a dessulfuracao de ferro fundido e processo para sua preparacao
US4853033A (en) * 1988-06-29 1989-08-01 Electric Power Research Institute Method of desulfurizing molten metal in a plasma fired cupola
US4941914A (en) * 1989-05-18 1990-07-17 Elkem Metals Company Desulfurization agent
NO179080C (no) * 1989-05-18 1996-07-31 Elkem Metals Avsvovlingsmiddel og fremgangsmåte for fremstilling av avsvovlingsmiddel
DE4206091C2 (de) * 1992-02-27 1994-09-22 Anton Dr More Verfahren zur Entschwefelung von Eisenschmelzen bei minimalem Schlacke-Anfall und eine dafür geeignete Vorrichtung
AT406690B (de) * 1994-12-09 2000-07-25 Donau Chemie Ag Mittel zur behandlung von roheisen- und gusseisenschmelzen zum zweck der entschwefelung
PL213251B1 (pl) 2009-02-02 2013-02-28 Akad Gorniczo Hutnicza Sposób wytwarzania mieszanki zuzlotwórczej dla pozapiecowej rafinacji stali w kadzi lub w piecu kadziowym

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019086A2 (fr) * 1979-05-19 1980-11-26 Hoechst Aktiengesellschaft Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus
EP0061011A1 (fr) * 1981-03-24 1982-09-29 Hoechst Aktiengesellschaft Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus
EP0070912A1 (fr) * 1981-07-27 1983-02-09 Thyssen Aktiengesellschaft vorm. August Thyssen-Hütte Procédé pour abaisser la teneur en fer des scories riches en CaO formées lors de la désulfuration de la fonte

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6031881B2 (ja) * 1977-03-31 1985-07-25 日本カーバイド工業株式会社 溶銑脱硫用組成物
JPS55110712A (en) * 1979-02-15 1980-08-26 Kawasaki Steel Corp Desulfurizing agent for blowing-in
GB2049736B (en) * 1979-04-19 1983-02-16 Foseco Int Desulphurisation of metals
JPS5770219A (en) * 1980-10-21 1982-04-30 Nisshin Steel Co Ltd Method for dephosphorizing, desulfurizing and denitrifying iron alloy
US4541867A (en) * 1984-03-20 1985-09-17 Amax Inc. Varnish-bonded carbon-coated magnesium and aluminum granules

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019086A2 (fr) * 1979-05-19 1980-11-26 Hoechst Aktiengesellschaft Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus
EP0061011A1 (fr) * 1981-03-24 1982-09-29 Hoechst Aktiengesellschaft Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus
EP0070912A1 (fr) * 1981-07-27 1983-02-09 Thyssen Aktiengesellschaft vorm. August Thyssen-Hütte Procédé pour abaisser la teneur en fer des scories riches en CaO formées lors de la désulfuration de la fonte

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, Band 4, nr. 135 (C-25)[617], 20. September 1980; & JP-A-55 85 612 (DENKI) 27-06-1980 *
PATENTS ABSTRACTS OF JAPAN, Band 7, nr. 122 (C-168)[1267], 26. Mai 1983; & JP-A-58 42 710 (IBIGAWA DENKI) 12-03-183 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0511121A1 (fr) * 1991-04-02 1992-10-28 Pechiney Electrometallurgie Désulfurant pour fonte constitué de carbure de calcium et de liant organique
FR2679256A1 (fr) * 1991-07-18 1993-01-22 Pechiney Electrometallurgie Desulfurant pour fonte liquide a base de carbure de calcium agglomere.

Also Published As

Publication number Publication date
ES2012038B3 (es) 1990-03-01
IN167748B (fr) 1990-12-15
JPH0733534B2 (ja) 1995-04-12
US4687512A (en) 1987-08-18
DE3667493D1 (de) 1990-01-18
DD249922A5 (de) 1987-09-23
JPS6286108A (ja) 1987-04-20
DE3535280A1 (de) 1987-04-09
EP0220522B1 (fr) 1989-12-13
PL146624B1 (en) 1989-02-28
PL261682A1 (en) 1987-09-07
ATE48652T1 (de) 1989-12-15

Similar Documents

Publication Publication Date Title
EP0061012B1 (fr) Procédé pour la fabrication d'agents de désulfuration de fonte et d'acier fondus
EP0220522B1 (fr) Mélange désulfurant pour bains métalliques, son procédé de fabrication et son utilisation
DE2458513A1 (de) Zuschlaege fuer die stahlerzeugung
DE2455802C2 (de) Zuschlag zur Entschwefelung von Eisen
DE2037758C3 (de) Verfahren zur Herstellung von CaIciumkarbid zur Entschwefelung von Metallschmelzen
EP0031552B1 (fr) Agent de désulfuration et procédé pour sa fabrication
DE2920353A1 (de) Verfahren zur herstellung von entschweflungsmitteln fuer roheisen- oder stahlschmelzen
DE3120138C3 (de) Pulverförmiges Entschwefelungsmittel
DE2852248C3 (de) Verfahren zur Erhöhung der Haltbarkeit basischer Ausmauerungen von Konvertern beim Frischen von Roheisen
DE3434894A1 (de) Verfahren zum frischen von roheisen
DE2709062A1 (de) Mittel und verfahren zur entschwefelung von eisenschmelzen
DE2303668C3 (de) Zubereitungen zur Behandlung von geschmolzenem Stahl
DE19747896B4 (de) Verfahren zum Valorisieren und zum eventuellen hierfür Bearbeiten von Pfannenschlacken
DE2309748C3 (de) Zusatzmittel zum Reinigen von Stahlschmelzen
EP0166019B1 (fr) Procédé de désulfuration de la fonte
EP0387580A1 (fr) Agent et procédé de désulfuration de métaux en fusion
DE2708403C2 (de) Feinkörnige Entschwefelungsgemische für Eisenschmelzen auf Basis von Erdalkalikarbonaten, sowie Verfahren zur Entschwefelung von Eisenschmelzen unter Verwendung dieser Entschwefelungsgemische
DE2233888C3 (de) Schlackebildungsmittel
DE835613C (de) Reinigungsmittel fuer Eisen- und Stahlschmelzen
DE3644518A1 (de) Verwendung von magnesit und verfahren zur durchfuehrung einer solchen verwendung
DE69022839T2 (de) Verfahren zur entphosphorung von chrom-enthaltenden roheisen mit niedrigem oxidationsverlust von chrom.
WO2015082093A1 (fr) Mélange, utilisation de ce mélange et procédé de conditionnement d'un laitier se trouvant sur une matière métallique en fusion dans un récipient métallurgique dans le domaine de la métallurgie du fer et l'acier
DE2716591A1 (de) Verfahren zur reduktion von molybdaenitkonzentraten
DE965040C (de) Verfahren zum raschen gleichzeitigen Abscheiden von Schwefel und Silizium aus geschmolzenem Roheisen
DE4210179A1 (de) Gemisch als Beimengung zum Erschmelzen und Feinen von Stahl und Gußeisen und Verfahren zu seiner Anwendung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE DE ES FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19870520

17Q First examination report despatched

Effective date: 19880718

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE ES FR GB IT LU NL SE

REF Corresponds to:

Ref document number: 48652

Country of ref document: AT

Date of ref document: 19891215

Kind code of ref document: T

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3667493

Country of ref document: DE

Date of ref document: 19900118

ITF It: translation for a ep patent filed

Owner name: SOCIETA' ITALIANA BREVETTI S.P.A.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
EPTA Lu: last paid annual fee
ITTA It: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 86113501.0

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20000809

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 20000814

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20000824

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20000831

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20000922

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20000927

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20001009

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20001027

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20001031

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20011001

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20011001

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20011001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20011002

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20011002

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20011031

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

BERE Be: lapsed

Owner name: HOECHST A.G.

Effective date: 20011031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020501

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20011001

EUG Se: european patent has lapsed

Ref document number: 86113501.0

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020628

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20020501

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020702

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20021113

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20051001