Method of mixed blowing for refining metals in a converter

Details Method of mixed blowing for refining metals in a converter Method of mixed blowing for refining metals in a converter

1980-12-05

1982-05-04

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 51, 75 52, C21C 532, C21C 534

Patent

active

043280315

ABSTRACT:
The present invention concerns a method of introducing refining gas and stirring gas into metal refining converters, and more particularly into converters in steelworks.
To achieve this, the subject of the present invention is a method of blowing oxidizing gases, particularly pure oxygen, to refine metals, and more particularly to refine pig iron into steel, in a converter, by means on the one hand of a lance blowing from top to bottom, and on the other hand by protected tuyeres blowing, vertically or obliquely, from bottom to top, and characterized in that the amount of oxygen blown from bottom to top by the tuyeres is between 3% and 25% of the total amount of oxygen necessary to refine the metal bath, in that this oxygen is blown from bottom to top with a practically constant flow or a decreasing flow, i.e. with a non-increasing flow, in that a stirring gas, neutral or oxidizing, whose flow is variable according to the various phases of blowing, and can even be zero at certain moments, can be added to this oxygen blown from bottom to top, and in that the jets of oxygen blown from bottom to top, whether or not mixed with a stirring gas, have a diameter at least equalling 18 millimeters, and preferably at least equalling 12 millimeters, this diameter being the jet diameter at the outlet of the tuyeres.

REFERENCES:
patent: 3854932 (1974-12-01), Bishop
patent: 3953199 (1976-04-01), Michaelis
patent: 4089677 (1978-05-01), Spenceley
patent: 4178173 (1979-12-01), Gorges

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