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US 3,945,820 AGranted
Process and immersion lances for introducing oxygen into a metal melt
AssigneeEisenwerk-Gesellschaft Maximilianshutte mbH
InventorsKarl Brotzmann, Hans Georg Fassbinder
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Abstract
Immersion lances for refining metal melts in hearth type vessels including open hearth and electric furnaces. The lances are movable into and out of the metal melt and comprise an oxygen pipe, a cooling medium pipe surrounding the oxygen pipe and a refractory casing which is wear resistant, temperature resistant and chemically resistant to the operating surroundings. The process of refining using such lances is also described.
Claims7
A process for refining a molten metal melt in a hearth furnace by means of oxygen which comprises:
- providing a movable lance supported for movement relative to said hearth furnace and movement into and out of said melt, said lance including a refractory sheath within which there are two concentric pipes, one of said pipes being a centrally located pipe for supplying oxygen to refine said melt and the second of said pipes being disposed around the oxygen pipe and being connected to a source of fluid hydrocarbon for protecting said lance from burning off when immersed in said metal melt;
- moving said lance into said melt;
- simultaneously blowing oxygen into said melt through said central pipe and hydrocarbon fluid into said melt through the annular gap between said two pipes, the amount of hydrocarbon being not more than 10% by weight of the oxygen, thereby refining said metal melt;
- and
- after refining said melt to the extent desired, withdrawing said lance from said melt.
2 more elements
Dependencies are inferred from the claim text.