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US 5,762,682 AGranted
Method and apparatus for processing ferrous materials
AssigneeVacmetal Limited
InventorJohn Rushe
Life of this patent
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AssigneeVacmetal Limited
InventorJohn Rushe
Estimating the term…
In steel-making, there are conflicting processing requirements at different stages of the process. The method and apparatus of the invention creates different processing conditions at different stages of the process. Molten ferrous material (2) is stirred by bubbling a gas therethrough. A refractory ring (10) is first partially immersed in the molten steel within a substantially slag free portion of the surface of the molten ferrous metal to form a bounded substantially slag-free area. The molten steel is then heated by the introduction of exothermically reacting heating agents such as aluminium and oxygen through an oxygen gas line (7) and an aluminium delivery tube (9), respectively. The refractory ring (10) is then removed from the molten steel when the steel has reached a predetermined temperature and air is then excluded from the volume above the molten steel by placing a hood (16) over the ladle containing the molten steel. Sulphur is then removed from the steel.
A method of processing molten ferrous metals containing at least some sulphur in a metallurgical vessel having a metal melt therein, said melt having an upper surface, said upper surface having slag thereon and said metallurgical vessel including a movable ring, the method including the steps of:
Apparatus for processing ferrous metals comprising;
Dependencies are inferred from the claim text.