Patent ID: 7708935
Filing Date: 2010-05-04
Classification: C03B,C04B,Y02P

Abstract:
1. A process for producing a float bath bottom refractory brick which comprises adding a potassium compound to a clayey material comprising, as represented by mass percentage based on the following oxides, from 30 to 45% of Al 2 O 3 and from 50 to 65% of SiO 2 , kneading, molding, firing and then crushing the material to obtain a granular refractory material, kneading the granular refractory material, molding it into a shape of a desired float bath bottom refractory brick, followed by firing, wherein the granular refractory material comprises a fine granular portion having a grain size of less than 90 μm, and the fine granular portion is controlled to result in that portion of the refractory brick obtained from said fine granular portion having, as represented by mass percentage based on the following oxides, a K 2 O content of from 2 to 4%, and a Na 2 O content of at most 1%, wherein the granular refractory material comprises from 20 to 60% mass % of the fine granular portion.