Method of decarburisation and dephosphorisation of a molten...

C - Chemistry – Metallurgy – 21 – C

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C21C 7/10 (2006.01) C21C 5/46 (2006.01) C21C 5/52 (2006.01) C21C 7/064 (2006.01) C21C 7/068 (2006.01)

Patent

CA 2371652

The present invention is related to a method of combined decarburisation/dephosphorisation of a molten metal, in particular for the production of ULC and/or SULC molten steels, wherein said dephosphorisation is achieved by blowing lime containing fluxes onto the steel bath during the decarburisation reaction in the degassing device. The present invention is also related to a multifunctional lance, which can be used to supply oxygen for decarburisation, as well as the powder containing lime based flux for dephosphorisation. Extra oxygen gas or solid oxides can be supplied to maintain the dephosphorisation process.

La présente invention concerne un procédé de décarburation/déphosphoration combiné d'un métal en fusion, notamment pour la production d'aciers en fusion ULC et/ou SULC, le procédé de déphosphoration consistant à projeter des flux contenant de la chaux dans le bain d'acier lors de la réaction de décarburation dans le dispositif de dégazage. La présente invention concerne également une lance multifonctionnelle pouvant s'utiliser pour projeter de l'oxygène de décarburation, ainsi qu'une poudre consistant en un flux à base de chaux destinée à la déphosphoration. On peut projeter de l'oxygène supplémentaire ou des oxydes solides pour continuer le procédé de déphosphoration.

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