Oxygen converter linings

Claim 1

AN OXYGEN CONVERTER VESSEL COMPRISING A METAL VESSEL HAVING A MOUTH AT ITS TOP, A SHELL PROTECTIVE LINING IN CONTACT WITH THE INSIDE SURFACE OF SAID VESSEL AND A WORKING LINING HAVING A SURFACE EXPOSED TO THE INTERIOR OF SAID VESSEL, SAID WORKING LINING B EING CONSTRUCTED OF THREE MAJOR ZONES, THESE THREE ZONES BEING THE BOTTOM ZONE, THE BARREL ZONE AND THE CONE SECTION ZONE, THE BOTTOM ZONE BEING GENERALLY DISH SHAPED AND OF UPWARDLY OPENING CONCAVE CONFIGURATION, THE BARREL ZONE EXTENDING FROM THE DISH SHAPED BOTTOM UPWARDLY TO THE CONE SECTION ZONE, THE BARREL ZONE BEING OF SUBSTANTIALLY UNIFORM CROSS SECTIONAL DIMENSION FROM THE BOTTOM ZONE TO THE CONE SECTION ZONE, THE CONE SECTION ZONE BEING OF DOWNWARDLY OPENING TRUNCATED CROSS SECTIONAL CONFIGURATION, THE WORKING LINING OF AT LEAST THE UPER PERIPHERAL LIP AREA OF THE CONE SECTION ZONE BEING FABRICATED OF TAR IMPREGNATED, CERAMICALLY BONDED MAGNESITE BRICK HAVING AN MGO OF AT LEAST 96%, SUBSTANTIALLY THE REMAINDER OF THE CONE SECTION ZONE, THE BARREL ZONE, AND THE BOTTOM ZONE PORTIONS OF THE WORKING LINING BEING FABRICATED OF TAR BONDED BASIC REFRACTORY, THE BASIC REFRACTORY USED TO FABRICATE A LIMITED CIRCUMFERENTIAL BAND PORTION OF THE BARREL ZONE BEING AN ESPECIALLY SLAG RESISTANT REFRACTORY COMPOSED OF AT LEAST 96% MGO+CAO, THE MGO RANGING FROM 50 TO 95% AND THE CAO FROM 50 TO 5%, AND THERE BEING PRESENT NO MORE THAN 4% OF SIO2, AL2O3, AND FE2O3, SAID BAND IN THE BARREL ZONE BEING POSITIONED IN SAID BARREL ZONE ABOVOE ITS POINT OF CONTACT WITH THE BOTTOM ZONE, AND JUST BEYOND MOLTEN METAL IN THE VESSEL IN THE SLAG SPLASH AREA OF THE VESSEL WHEN IT IS IN OPERATION.