Table 1 Chemical composition of the used raw materials
Oxides % | Trachyte | Clay | Bentonite |
|---|---|---|---|
SiO2 | 61.81 | 52.97 | 53.12 |
Al2O3 | 16.69 | 29.07 | 15.98 |
TiO2 | 0.18 | 1.48 | 1.15 |
Fe2O3 | 4.95 | 3.92 | 9.24 |
CaO | 1.12 | 0.5 | 0.81 |
MgO | 0.29 | 0.2 | 3.77 |
Na2O | 7.97 | 0.06 | 4.26 |
K2O | 4.37 | 0.28 | 0.83 |
SO3 | 0.06 | 0.76 | 0.76 |
ZrO2 | 0.25 | – | – |
Cl | – | – | 1.45 |
LOI | 1.62 | 10.62 | 8.15 |
Total | 99.31 | 99.86 | 99.52 |