Method of dephosphorizing molten pig iron
US4356032A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1981 |
| Grant date | Oct 26, 1982 |
| Priority date | — |
| Expiry date | Jun 23, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21C1/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of dephosphorizing molten pig iron, wherein molten pig iron is charged into a refining vessel provided at its bottom with tuyeres for blowing gas and, if necessary, at its top with a gas injecting member, and a powdery refining agent together with the blowing gas is blown into molten pig iron through the tuyeres, while a flux for the refining agent is charged into the refining vessel to perform desiliconization and subsequent dephosphorization of molten pig iron, is disclosed. This method comprises PA1 (a) charging a coolant together with molten pig iron into the refining vessel to control a temperature of molten pig iron during the blowing to a range of 1,250.degree.-1,450.degree. C.; PA1 (b) blowing the powdery refining agent into molten pig iron so as to adjust a value of slag basicity after the treatment to not less than 2.5; and PA1 (c) blowing the blowing gas at a rate of not less than 0.5 Nm.sup.3 /min.t so that a net oxygen quantity is 8-15 Nm.sup.3 per ton of molten pig iron.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.