C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
53/83
C21C 5/30 (2006.01) C21C 5/35 (2006.01)
Patent
CA 1177252
STEEL CONVERSION METHOD ABSTRACT OF THE DISCLOSURE A steel conversion method includes the steps of deliver- ing a first quantity of oxygen and a surrounding sheath of hydro- carbon shielding fluid beneath the level of a quantity of molten ferrous metal or bath contained in a vessel by means of bottom tuyeres and simultaneously delivering a second quantity of oxygen to the bath from above through a top lance. The oxygen delivered through the bottom tuyeres is sufficient to promote mixing and is about 10% to 40% of the oxygen required for oxidation of impuri- ties with the balance delivered through the top lance. An addi- tional quantity of oxygen is delivered through the top lance to the space above the bath for post-combustion of off-gases to increase the thermal energy in the bath. Fluxes such as lime are added from above in lump form in the conventional manner or are entrained in the upper oxygen stream as required. As the level of carbon in the bath falls toward desired levels, an inert gas is introduced through the bottom tuyeres at an increased rate while the proportion of oxygen is decreased.
381960
Pearce Jai K.
Schempp Eberhard G.
Sieckman Walter
Bereskin & Parr
Pennsylvania Engineering Corporation
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