Refractory shapes and method of making same

Claim 1

THAT METHOD OF PREPARING REFRACTORY SHAPES FOR USE IN CONTACT WITH BASIC MATERIALS AT VERY HIGH TEMPERATURES, COMPRISING FORMING A MIXTURE OF MGO, CAO, AND CR2O3, THE MIXTURE CONSISTING ESSENTIALLY OF SUFFICIENT OF A CHROMIUM COMPOUNDS BEING SELECTED FROM THE GROUP CONSISTING OF SOLUBLE CHROMIUM COMPOUNDS AND -100 MESH TECHNICAL GRADE CHROMIC OXIDE TO YIELD CHROMIC OXIDE IN AN AMOUNT EQUAL TO ABOUT 1 TO 5%, BY WEIGHT, OF THE TOTAL BATCH, MGO IN THE RANGE 5-94% AND CAO IN THE RANGE 5-50%, THE TOTAL BATCH HAVING A SOLIDS ANALYSIS OF AT LEAST ABOUT 96 WEIGHT PERCENT OF CAO PLUS MGO PLUS CR2O3, THE MGO AND CAO COMPONENTS OF SAID MIXTURE SELECTED FROM THE GROUP CONSISTING OF HIGH PURITY CALCINED LIME, HIGH PURITY CALCINED DOLOMITE, AND CAUSTIC CALCINED MAGNESIA, SAID MIXTURE BEING COBURNED TO A TEMPERATURE OF AT LEAST ABOUT 2900*F. TO PRODUCE A DEAD BURNED PRODUCT OF HIGH DENSITY, THE REMAINDER OF THE MIXTURE CONSISTING OF MATERIAL OF THE GROUP WHICH ANALYZES, ON AN OXIDE BASIS, SIO2, AL2O3, AND FE2O3, CRUSHING AND SIZING THE DEAD BURNED PRODUCT, MIXING SAID BURNED PRODUCT WITH LIQUIFIED PITCH, AND FORMING SHAPES FROM THE BATH OF PITCH AND BURNED PRODUCT.