Title:
溶銑予備処理方法
Document Type and Number:
Japanese Patent JP6954253
Kind Code:
B2
Abstract:
To provide a hot metal pretreatment method capable of reducing a phosphorus concentration after a dephosphorization treatment while suppressing temperature drop during the treatment when removing silicon and phosphorus contained in the hot metal.SOLUTION: In the hot metal pretreatment method that includes a concurrent treatment of desiliconization and dephosphorization: a primary pretreatment is performed in such a manner that an oxygen gas and a refining agent containing lime and iron oxide as main components are supplied to a same location in the hot metal by using an immersion lance without discharging slag or allowing the slag to flow out, and is completed at 0.050 mass% or more of a phosphorus concentration in the hot metal; the slag generated in the pretreatment is discharged; the similar secondary pretreatment is performed if necessary, and then the slag is discharged; and further, main treatment for the dephosphorization is performed in which the oxygen gas is blown onto the hot metal bath surface from a top blowing lance, and a dephosphorization flux containing the lime and the iron oxide as the main components is injected into the hot metal.SELECTED DRAWING: Figure 1
Inventors:
Hidemitsu Negishi
Yuta Hino
Yuta Hino
Application Number:
JP2018189676A
Publication Date:
October 27, 2021
Filing Date:
October 05, 2018
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C21C1/02; C21C1/04
Domestic Patent References:
| JP5005115A | ||||
| JP8232009A | ||||
| JP2002105520A | ||||
| JP2002069518A | ||||
| JP10168509A | ||||
| JP2013127089A | ||||
| JP11269524A | ||||
| JP2070014A |
Foreign References:
| WO2018123991A1 | ||||
| KR1020100025914A | ||||
| CN103215405A |
Attorney, Agent or Firm:
Ginza Marronnier Patent Office