Patent ID: 7270704

Claim:
An aluminosilicate mixture for fabricating fireproof, high-strength granules, the mixture consisting essentially of: a product of a combined grind of preliminarily roasted kaolin and bauxite, wherein: the preliminary roasted kaolin to a water absorption of no more than 5% is present in the mixture in an amount of 33-67 wt. % and is produced by roasting a kaolin containing Al 2 O 3 in an amount of 40-45 wt. % and free quartz in an amount that is no more than 5 wt. %, at a temperature in the range of from 1400° C. to 1500° C., the balance of the mixture being the preliminary roasted bauxite, produced by roasting a bauxite at a temperature higher than 1100° C., and wherein the mixture contains no less than 50 wt. % of Al 2 O 3 .