Method of refining an iron base melt

Details Method of refining an iron base melt Method of refining an iron base melt

1974-11-15

1976-07-20

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 52, 75 59, C21C 532, C21C 534

Patent

active

039704467

ABSTRACT:
A method of oxygen refining molten hot metal to steel by blowing an oxygen stream at a predetermined flow rate from an oxygen supply source having a pressure from about 12 to about 18 atmospheres through the molten hot metal from a tuyere located beneath the surface of the molten hot metal and having a tuyere inlet and by varying the rate of flow of a finely divided lime injected into the oxygen stream is disclosed.
The method includes the steps of supplying oxygen from the oxygen supply source to the tuyere inlet at the predetermined oxygen flow rate for refining the molten hot metal; controlling the pressure of the oxygen stream at the tuyere inlet at a value which is about three atmospheres less than the difference between the pressure of the oxygen supply source and the oxygen pressure drop resulting from supplying the oxygen stream from the oxygen supply source to the tuyere inlet; injecting the finely divided lime into the oxygen stream at an injection point prior to the entry of the oxygen stream into the tuyere inlet; and increasing the pressure of the oxygen stream upstream of the injection point to maintain substantially constant the predetermined oxygen flow rate.

REFERENCES:
patent: 2864689 (1958-12-01), Perrin
patent: 3079249 (1963-02-01), DE Moustier
patent: 3771998 (1973-11-01), Knuppel

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