To provide a method for desulfurizing molten iron with which an impeller desulfurization can effectively and economically be performed by sufficiently demonstrating the desulfurizing function of ingot-making slag.
This method for desulfurizing the molten iron includes: a step for storing the ingot-making slag having composition of, by mass ratio, 25-40% AL2O3, ≤5% T.Fe and 5.5-7.0 basicity (CaO/SiO2) and remaining in a ladle at the finishing time of casting, into a slag collecting vessel; and a step for selecting only the high temperature and granular ingot-making slag from the ingot-making slag stored at the above step. The high temperature and granular ingot-making slag selected at the above step is mixed with CaO based desulfurizing agent so that the ingot-making slag ratio becomes 10-40%, by mass ratio, and charged into the molten iron in the ladle to apply the impeller-desulfurization. Further, in this method for desulfurizing the molten iron, it is preferable that the temperature of the ingot-making slag selected as the desulfurizing agent is ≥300°C.
| JPS5816009 | DEPHOSPHORIZING METHOD FOR MOLTEN METAL |
| JPS5757811 | DEPHOSPHORIZATION METHOD OF MOLTEN IRON |
| JPS63274709 | PRODUCTION OF CAST IRON |
NISHI HIROKI
KUROSE YOSHIKAZU
| JP2000129328A | 2000-05-09 | |||
| JPH06281363A | 1994-10-07 | |||
| JP2002194414A | 2002-07-10 | |||
| JP4037128B | ||||
| JPS5970707A | 1984-04-21 | |||
| JP2005240145A | 2005-09-08 | |||
| JP2006070308A | 2006-03-16 |