Global Patent Index - EP 0974674 A1

EP 0974674 A1 2000-01-26 - Method for desulferization of molten pig iron

Title (en)

Method for desulferization of molten pig iron

Title (de)

Verfahren zum Entschwefeln einer Roheisenschmelze

Title (fr)

Méthode pour la désulfuration de la fonte liquide

Publication

EP 0974674 A1 (DE)

Application

EP 99106652 A

Priority

DE 19833036 A

Abstract (en)

Molten pig iron is desulfurized by injection of a high reducing additive content agent under conditions which take thermodynamic and reaction kinetics requirements into account. Preferred Features: The parameters are a relatively high ratio of the agent injection rate to the transport gas rate, a relatively high specific total gas quantity and a relatively high ratio of evolved gas quantity to transport gas quantity. The agent comprises (by wt.) 30-72 CaC2, 15-62% CaO and 8-20% gas-evolving additive, especially gas coal, flame coal, plastic or other hydrocarbon which evolves reducing gases at pig iron temperatures of 1150-1500 degrees C.

Abstract (de)

Die Erfindung befaßt sich mit einem Verfahren zum Entschwefeln einer Roheisenschmelze, bei dem ein Schmelzebehandlungsmittel mit Hilfe eines Transportgases in ein Roheisen-Schmelzebad eingeblasen wird. Um relativ kurze Einblaszeiten bei vergleichsweise geringen Entschwefelungsmittelkosten erzielen zu können, wird das Schmelzebehandlungsmittel mit einem relativ hohen Anteil an reduzierend wirkendem, gasabspaltendem Zusatzstoff verwendet und das Einblasen dieses Schmelzbehandlungsmittels bei Kombination von thermodynamische und reaktionskinetische Erfordernisse berücksichtigenden Verfahrensparametern durchgeführt.

IPC 1-7 (main, further and additional classification)

C21C 1/02

IPC 8 full level (invention and additional information)

C21C 1/02 (2006.01)

CPC (invention and additional information)

C21C 1/025 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE DE FR GB IT

EPO simple patent family

EP 0974674 A1 20000126; EP 0974674 B1 20041006; AT 278810 T 20041015; DE 19833036 A1 20000127

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