Research Article
Synthesis and Properties of Red Mud-Based Nanoferrite Clinker
Table 4
Variation in content of major phases in NF at different CaCO3/red mud ratios (%).
| | CaCO3/red mud (wt%) | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 1.0 | 1.2 | 1.5 | 1.8 | 2.0 |
| | Ca2FeAlO5 (brownmillerite) | 19.2 | 21.7 | 23.4 | 32.1 | 39.0 | 36.3 | 41.5 | 47.2 | 39.8 | 34.9 | | Ca2Fe2O5 (srebrodolskite) | 14.1 | 22.5 | 26.1 | 30.9 | 18.0 | 19.2 | 13.3 | 10.4 | 10.3 | 9.0 | | CaFe3O5 (calcium iron oxide) | 6.4 | 4.3 | 4.4 | 3.7 | 3.9 | 4.4 | 5.4 | 2.8 | 2.5 | 3.7 | | Ca3Fe2(SiO4)3 (andradite) | 2.1 | 3.5 | 2.7 | 0.6 | 2.6 | 2.7 | 0.6 | 1.7 | 0.3 | 2.1 | | Fe2O3 (hematite) | 14.8 | 17.2 | 12.8 | 9.4 | 5.5 | 3.3 | 5.0 | 2.5 | 2.3 | 3.4 | | β-Ca2SiO4 (dicalcium silicate) | 14.0 | 9.5 | 6.3 | 5.2 | 7.0 | 7.5 | 6.9 | 7.4 | 7.2 | 6.2 | | α-Ca2SiO4 (dicalcium silicate) | 2.3 | 3.5 | 3.9 | 4.2 | 6.1 | 0.5 | 0.8 | 0.9 | 0.7 | 0.6 | | α-Ca2SiO4 (dicalcium silicate) | 1.5 | 0.2 | 0.2 | 0.1 | 0.2 | 1.4 | 0.2 | 0.3 | 0.2 | 0.2 | | Ca2SiO4 (sum(α+α+β)) (dicalcium silicate) | 17.8 | 13.2 | 10.4 | 9.5 | 13.3 | 9.4 | 8.0 | 8.6 | 8.1 | 7.0 | | Ca3Si2O7 (rankinite) | 12.9 | 12.5 | 12.8 | 8.3 | 11.5 | 16.8 | 15.8 | 10.5 | 11.0 | 8.2 | | CaCO3 (calcite) | 0.6 | 0.1 | 0.1 | 0.1 | 0.1 | 2.2 | 2.5 | 6.2 | 15.1 | 16.2 | | CaO (lime) | 1.6 | 1.1 | 2.8 | 3.4 | 3.9 | 3.2 | 7.0 | 8.8 | 9.8 | 13.8 | | (CaO)12(Al2O3)7 (mayenite) | 0 | 0 | 0.5 | 0.1 | 0.3 | 1.2 | 0.4 | 0.6 | 0.1 | 0 | | NaAlSi4 (sodium aluminium silicon) | 1.2 | 1.8 | 1.7 | 1.0 | 1.7 | 3.2 | 0.6 | 0.7 | 0.7 | 1.7 | | Na8Al4Si4O18 (sodium aluminum silicate) | 9.7 | 1.8 | 2.3 | 0.9 | 0.3 | 0 | 0 | 0 | 0 | 0 |
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