Apparatus for shielding a molten metal stream
AssigneeDidier-Werke AG
InventorHans Mielke
Life of this patent
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Abstract
An apparatus for shielding from the surrounding air a stream of molten metal being discharged from a discharge sleeve of a metallurgical vessel includes a tuyere-like adapter device mounted about the discharge sleeve. The tuyere-like adapter device is supplied with a pressurized inert gas and is constructed to produce a hollow jet of inert gas having a maximum length of approximately 20 cm as a gaseous shield surrounding a molten metal stream discharged from the discharge sleeve.
Claims11
In an apparatus for discharging molten metal from a metallurgical vessel, said apparatus being of the type including a refractory discharge sleeve having an outlet end located above an inlet end of a molten metal receiving member with a space therebetween, the improvement comprising means for shielding from the surrounding air a stream of molten metal during passage thereof through said space between said outlet end of said discharge sleeve and said inlet end of said receiving member, said shielding means comprising:
- an annular refractory sleeve surrounding said discharge sleeve and positioned above and spaced from said receiving member;
- said refractory sleeve and said discharge sleeve defining therebetween an annular, downwardly directed gap;
- said refractory sleeve having a gas collection chamber;
- outer inlet means for supplying pressurized inert gas to said gas collection chamber;
- and
- means for supplying said inert gas from said gas collection chamber into said annular gap and thereby for producing a downwardly directed hollow jet of inert gas having a maximum length of approximately 20 cm as a gaseous shield in said space surrounding a molten metal stream discharged from said outlet end of said discharge sleeve.
Dependencies are inferred from the claim text.