EP 1533388 A4 20110202 - METHOD OF MANUFACTURING LOW PHOSPHOROUS HOT METAL
Title (en)
METHOD OF MANUFACTURING LOW PHOSPHOROUS HOT METAL
Title (de)
VERFAHREN ZUR HERSTELLUNG VON PHOSPHORARMEM HEISSEM METALL
Title (fr)
PROCEDE DE FABRICATION DE METAL EN FUSION A BASSE TENEUR EN PHOSPHORE
Publication
Application
Priority
JP 0208604 W 20020827
Abstract (en)
[origin: EP1533388A1] The invention is to implement an efficient dephosphorization treatment without adding a large amount of CaF2 and with a small addition amount of a refining agent. The invention is made based on the finding that a very efficient dephosphorization refinement utilizing an inhomogeneous molten state of slag can be implemented by feeding a gaseous oxygen and a refining agent onto a bath surface of a molten iron in a specific mode under conditions wherein a post-treatment slag is reduced appreciably in comparison to a conventional case. The dephosphorization treatment is performed by blowing the gaseous oxygen and at least a part of the refining agent onto the bath surface of the molten iron through a top blowing lance. Concurrently, the post-treatment slag rate is controlled to 30 kg/ton of molten iron or less, preferably to 20 kg/ton of molten iron or less, and more preferably 10 kg/ton of molten iron or less. In addition, the dephosphorization treatment be performed for an molten iron having a Si content of 0.15 mass% or less, more preferably 0.07 mass% or less, and particularly preferably 0.03 mass% or less. <IMAGE>
IPC 1-7
IPC 8 full level
C21C 1/02 (2006.01); C21C 5/32 (2006.01); C21C 5/36 (2006.01); C21C 7/064 (2006.01); C21C 7/072 (2006.01)
CPC (source: EP KR)
C21C 1/02 (2013.01 - EP); C21C 1/025 (2013.01 - EP); C21C 5/32 (2013.01 - EP); C21C 5/35 (2013.01 - KR); C21C 5/36 (2013.01 - EP); C21C 7/064 (2013.01 - EP); C21C 7/0645 (2013.01 - EP); C21C 7/072 (2013.01 - EP)
Citation (search report)
- [A] JP S58147506 A 19830902 - KAWASAKI STEEL CO
- [A] JP S5819423 A 19830204 - KAWASAKI STEEL CO
- [A] JP 2000129329 A 20000509 - SUMITOMO METAL IND
- [A] JP H08311523 A 19961126 - SUMITOMO METAL IND
- See references of WO 2004020677A1
Designated contracting state (EPC)
BE DE
DOCDB simple family (publication)
EP 1533388 A1 20050525; EP 1533388 A4 20110202; EP 1533388 B1 20130814; BR 0213573 A 20041026; BR 0213573 B1 20131112; KR 100681292 B1 20070209; KR 20040053371 A 20040623; WO 2004020677 A1 20040311
DOCDB simple family (application)
EP 02807713 A 20020827; BR 0213573 A 20020827; JP 0208604 W 20020827; KR 20047007980 A 20020827