Minerals and Metals in Ancient India v1.c19.s5.t3.3

v1.c19.s5.t3.3

However, the proportions of SiO₂, Al₂O₃, CaO and MgO are lower in four of the five slags (exception being slag No. 3 vide Table 11.2) compared to the raw material, and iron percentage much higher. Therefore, the raw material used must have been lot purer than the iron shale (as analysed above) to produce slag containing as high as 63-66 per cent Fe₂O₃. Alternatively it may be suggested that only No. 3 is acceptable as a representative slag.