Oxygen converter linings

Claim 1

AN OXYGEN CONVERTER FURNACE 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 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 DISC-SHAPED AND OF UPWARDLY OPENING CONCAVE CONFIGURATION, THE BARREL ZONE EXTENDING FROM HE DISH-SHAPED BOTTOM UPWARDLY TO THE CONE SECTION ZONE, THE BARREL ZONE BEING SUBSTANTIALLY UMIFORM CROSS SECTIONAL DIMENSION FROM THE BOTTOM ZONE TO THE CONE SECTION ZONE, THE CONE SECTION ZONE BEING OF DOWNWARDLY OPENING TRUNCATED CROSS SECTION CONFIGURATION THE BOTTOM ZONE PORTION OF THE WORKING LINING BEING FABRICATED OF TAR BONDED BASIC REFRACTORY, THE WORKING LINING EXTENDING FROM THE BOTTOM ZONE UPWARDLY SUBSTANTIALLY THE FULL EXTENT OF THE BARREL ZONE TO THE CONE SECTION ZONE, WHEN VIEWED IN VERTICAL CROSS SECTION, BEING CONSTRUCTED OF ALTERNATING COURSES OF TAR BONDED AND TAR IMPREGNATED CHEMICALLY BASIC REFRACTORY SHAPES, THE TAR BONDED SHAPES BEING FABRICATED OF REFRACTORY MATERIAL OF THE GROUP HARD BURNED LIME, DEAD BURNED DOLOMITE AND DEAD BURNED MAGNESITE, THE CERMICALLY BONDED TAR IMPREGNATED SHAPES BEING FABRICATED OF REFRACTORY MATERIAL ANALYZING AT LEAST ABOUT 95% MG+CAO AND SELECTED FROM THE GROUP CONSISTING BURNED MAGNESITE, THERE BEING NO MORE THAN ABOUT DEAD BURNED MAGNESITE, THERE BEING NO MORE THAN ABOUT 4% OF SIO2, AL2O3 AND FE2O3 IN SAID CERAMICALLY BONDED TAR IMPREGNATED REFRACTORY SHAPES, AND A FINAL COURSE ABOUT THE PERPHERAL LIP OF THE OPEN TOP OF THE FURNACE BEING FABRICATED OF SAID CERAMICALLY BONDED TAR IMPREGNATED BASIC REFRACTORY.