Manufacture of kiln furniture

Claim 1

A BATCH CONSISTING ESSENTIALLY OF FINELY DIVIDED SILICA, AT LEAST 1%, BY WEIGHT, OF THE BATCH BEING VOLATILIZED SILICA, SILICON CARBIDE, AND A HIGH ALUMINA REFRACTORY MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALUMINA, ALUMINUM ORES, AND MIXTURES THEREOF CONTAINING AT LEAST ABOUT 50% AL2O3, BY ANALYSIS; AND HYDRATED ALUMINA, THE SILICON CARBIDE CONSTITUTING FROM ABOUT 50 TO 70% BY WEIGHT, OF THE REFRACTORY AND THE MAJOR PORTION THEREOF BEING ABOUT -4+48 U.S. STANDARD MESH SCREEN SIZING WITH NOT MORE THAN ABOUT 20% OF THE SILICON CARBIDE PASSING A 70 U.S. STANDARD MESH SCREEN, FROM ABOUT 0.2 TO 10% OF THE HYDRATED ALUMINA, SUBSTANTIALLY ALL SAID HYDRATED ALUMINA BEING -325 MESH, THE HIGH ALUMINA MATERIAL AND SILICA CONSTITUTING THE REMAINDER OF THE BATCH AND BEING PRESENT IN A WEIGHT RATIO OF ALUMINA TO SILICA BETWEEN ABOUT 90/10 AND 60/40, THE SILICA SUBSTANTIALLY ALL BEING - 200 MESH, TOTAL SILICA BEING BETWEEN 1 AND 10%, THE ALUMINA MATERIAL BEING SIZE GRADED TO PREPARE A BRICKMAKING BATCH.