Temperature treatment (˚C) | Loi (%) | Colour of sample |
105 (Uncalcined GFESs) | 0.98 ± 0.05 | LB |
700 | 12.93 ± 0.67 | DG |
800 | 46.58 ± 0.15 | LG |
900 | 47.65 ± 0.01 | W |
1000 | 47.73 ± 0.19 | W |
1100 | 48.48 ± 0.24 | W |