Patents
An improved process for making ceramic tiles using glauconitic sandstone which comprises grinding glauconitic sandstone, china clay, pyrophyllite and an alkaline phosphatic binder separately to a fine powder of the size in the range of-l00 to -300BSS, mixing the powders so obtained to make a blend comprising of glauconitic sandstone in the range of 40-95wt clay in the range of 0 to 50 wt pyrophyllite in the range of and binder in the range of 5-12wt moistening the said blend with water and compacting in moulds of desired size at pressure in the range of 250 to 800kg/cm2 to obtain green tiles, firing the said green tiles at a temperature in the range of 650 to 825 C for a period in the range of 50 to 120 minutes to obtain ceramic tiles.