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Abstract
After fusion of the sample with KOH in nickel crucible, extracting the same with water and acidifying the homogeneous solution, an aliquot is taken out for the determination of SiO2 based on the titration of liberated HF on hyrolysis of K2SiF6 in hot water and the other aliquot for the determination of Al2O3 based on the titration of released EDTA from Al-EDTA complex on boiling with NaF. This simultaneous determination of SiO2 and Al2O3 in aluminosilicate samples, particularly high alumina refractories, mullite, kyanite, etc is very rapid and simple. The time required for the determination of SiO2 and Al2O3 of such samples is only two hours and a half.