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US 4,356,035 AGranted
Steelmaking process
AssigneeEisenwerk-Gesellschaft Maximilianshutte
InventorsKarl Brotzmann, Paul Mantey
Life of this patent
Estimating the term…
Abstract
Oxygen is introduced onto the surface of a molten ferrous metal through at least one water-cooled lance disposed above the melt surface while an oxygen free gas in which is entrained ground solids is intermittently introduced into the molten ferrous metal through tuyeres disposed below the melt surface.
Claims11
A process for making steel in a convertor equipped with tuyeres located below the bath surface and with a water-cooled lance and with topblowing tuyeres located above the bath surface which comprises:
- introducing the oxygen feed onto the bath surface through said water-cooled lance and by at least one topblowing tuyere pointing at the bath surface, and at least intermittently introducing an oxygen-free gas, loaded at least in part with ground solids for the purpose of slag formation or for the purpose of heat supply or for both purposes, into the melt through the tuyeres located below the bath surface, the amount of oxygen which is introduced through the tuyeres located below the bath surface being less than 10 percent the total oxygen introduced.
Dependencies are inferred from the claim text.