Process for refining of a bath of metal containing cold...

Details Process for refining of a bath of metal containing cold... Process for refining of a bath of metal containing cold...

C - Chemistry, Metallurgy

21

C

53/91

C21C 5/32 (2006.01)

Patent

CA 1154264

ABSTRACT OF THE DISCLOSURE A process for refining a metal bath in a converter by oxygen blowing, particularly a molten metal liquid bath contain- ing cold, solid substances, notably of scrap. Oxygen is dis- tributed over the surface of the bath, so that there will be an after-combustion of CO released in the course of decarbo- nization. The thickness and consistency of a slag layer formed over the bath is actively regulated by injecting a rising inert gas through the bottom of the bath. The flow of rising gas may be regulated depending upon the oxygen content in the fumes of the converter, or upon the intensity of the sound emitted by a lance blowing oxygen through the top. In this manner, the metal-slag interface is continuously being regenerated so that the slag is continuously being deoxidized and cannot foam. The absence of a foamy consistency enables the energy resulting from the after-combustion of CO to radiate which makes it possible to increase the additions of solid scrap.

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