Controlling pig iron refining

Details Controlling pig iron refining Controlling pig iron refining

1977-02-01

1979-04-17

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

C21C 530

Patent

active

041498771

ABSTRACT:
Industrially pure oxygen is blown into molten pig iron surmounted by a layer of slag in a converter by means of at least one tuyere located below the upper surface of the molten metal. Input and output parameters are monitored and input parameters are controlled in order to obtain steel of a desired quality (e.g. composition and/or temperature). The intensity of sound emitted by the converter (e.g. in the range of from 20 to 50 Hz) is measured while the oxygen is blown in. The instant at which the intensity undergoes a sudden and considerable decrease is detected. From that instant, only that amount of oxygen is blown in which is necessary and sufficient to provide the steel with the desired quality at the end of the refining operation.

REFERENCES:
patent: 2529387 (1950-11-01), Haglund
patent: 3533778 (1970-10-01), Nilles et al.
patent: 3645718 (1972-02-01), Murphy
patent: 3748122 (1973-07-01), Ramachandran

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