Method and metallurgical device for the refining of steel

Claim 1

AN OXYGEN LANCE COMPRISING A PLURALITY OF CONCENTRIC TUBULAR MEMBERS WHICH INCLUDES: AN INNER TUBULAR MEMBER HAVING INLET AND DISCHARGE ENDS, SAID DISCHARGE END HAVING A NOZZLE WITH AN APERTURE OF RADIALLY DIVERGING WALLS AND OF RESTRICTED AREA RELATIVE TO THE BORE OF SAID INNER TUBULAR MEMBER, A SECOND SURROUNDING TUBULAR MEMBER WITH INLET AND DISCHARGE ENDS AND SPACED APART FROM AND FORMING AN ANNULAR PASSAGEWAY WITH THE OUTER WALL OF SAID INNER TUBULAR MEMBER, THE DISCHARGE END OF SAID SECOND TUBULAR MEMBER BEING FLARED AND IN COPLANAR RELATIONSHIP WITH THE DISCHARGE END OF SAID INNER TUBULAR MEMBER, AN INSULATING JACKET SURROUNDING SAID SECOND TUBULAR MEMBER FOR A MAJOR PORTION OF ITS LENGTH, A PORTION OF SAID SECOND TUBULAR NEAR THE DISCHARGE END THEREOF BEING UNINSULATED AND CONNECTED TO SAID INNER TUBULAR MEMBER BY SPACER MEMBERS THEREBY EFFECTING A HEAT CONDUCTING RELATIONSHIP BETWEEN THE UNINSULATED PORTION OF SAID SECOND TUBULAR MEMBER AND SAID NOZZLE OF SAID INNER TUBULAR MEMBER, A THIRD SURROUNDING TUBULAR MEMBER TOTALLY ENCLOSING SAID INSULATING JACKET, AN OUTER CASING ENCLOSING ALL OF SAID TUBULAR MEMBERS AND BEING ADAPTED TO CONTAIN A COOLING FLUID SURROUNDING SAID THIRD TUBULAR MEMBER AND SAID UNINSULATED PORTION OF SAID SECOND TUBULAR MEMBER, AND A TUBULAR BAF-