Table 3.
The major chemical compositions (Oxide wt.%) of red mud in China.
| Refinery | Process | SiO2 | Al2O3 | Fe2O3 | CaO | TiO2 | Na2O | MgO | K2O | Cr2O3 | P2O5 | SO3 | MnO | LOI | Refs. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HN-A | Bayer | 22.5 | 25.3 | 8.1 | 15.1 | 3.8 | 8.8 | 1.3 | 1.2 | 0.1 | 0.3 | - | 0.1 | 12.1 | This Study |
| SD-A | Bayer | 16.7 | 20.4 | 23.7 | 13.6 | 4.9 | 8.0 | 0.4 | 0.2 | 0.1 | 0.3 | 0.4 | - | 11.2 | |
| GX-A1 | Bayer | 16.6 | 23.8 | 30.6 | 2.2 | 6.9 | 9.7 | 0.2 | 0.1 | 0.1 | 0.3 | 0.4 | - | 9.1 | |
| GX-B | Bayer | 15.3 | 20.5 | 21.2 | 14.5 | 5.7 | 8.1 | 0.7 | 0.1 | 0.3 | 0.2 | 0.7 | 0.1 | 12.5 | |
| GX-A2 | Bayer | 16.4 | 19.1 | 22.0 | 16.0 | 5.0 | 7.6 | 0.9 | 0.1 | 0.2 | 0.2 | 0.3 | 0.1 | 12.0 | |
| Guangxi | Bayer | 9.1 | 18.7 | 37.0 | 6.0 | 6.4 | 3.4 | - | - | - | - | - | - | - | [25] |
| Guangxi | Bayer | 8.4 | 18.5 | 31.3 | 18.1 | 6.2 | 3.2 | 0.7 | 0.2 | 0.3 | - | 0.3 | 0.7 | 13.9 | [26] |
| Guangxi | Bayer | 11.9 | 17.5 | 32.5 | 14.1 | 5.5 | 4.0 | - | 1.0 | - | - | - | - | - | [27] |
| Guangxi | Bayer | 11.9 | 19.5 | 29.9 | 13.9 | 3.4 | 4.6 | 2.8 | - | - | - | - | - | 11.6 | [28] |
| Guangxi | Bayer | 8.9 | 18.9 | 34.3 | 13.6 | 6.1 | 4.4 | 0.4 | 0.1 | - | - | - | - | - | [5] |
| Henan | Bayer | 20.6 | 25.5 | 11.8 | 14.0 | 4.1 | 6.6 | 1.5 | 2.1 | - | - | - | - | - | [5] |
| Henan | Combined | 20.4 | 7.6 | 8.2 | 44.7 | 7.3 | 3.0 | - | - | - | - | - | - | 11.0 | [29] |
| Henan | Sintering | 21.4 | 8.8 | 8.6 | 36.0 | 2.6 | 3.2 | 1.9 | 0.8 | - | - | - | - | 16.3 | [30] |
| Henan | Bayer | 18.6 | 23.0 | 12.4 | 15.7 | 4.1 | 4.5 | 1.6 | 1.8 | - | - | - | - | 12.5 | [8] |
| Henan | Combined | 22.5 | 7.0 | 8.1 | 44.1 | 7.3 | 2.4 | 2.0 | 0.5 | - | - | - | - | 8.3 | [30] |
| Henan | Sintering | 17.2 | 8.1 | 9.8 | 37.0 | 4.7 | 2.5 | 1.0 | 2.5 | - | 0.3 | - | 0.0 | 17.0 | [31] |
| Henan | Sintering | 20.9 | 7.0 | 7.2 | 48.4 | 3.2 | 2.3 | - | - | - | - | - | - | - | [32] |
| Shandong | Sintering | 32.5 | 8.3 | 5.7 | 41.6 | - | 2.3 | - | - | - | - | - | - | - | [5] |
| Shandong | Sintering | 19.1 | 8.8 | 12.2 | 35.5 | 2.4 | 3.9 | 1.9 | 0.4 | - | - | 0.3 | - | - | [33] |
| Shandong | Sintering | 19.1 | 6.9 | 12.8 | 46.0 | 3.4 | 2.4 | 1.2 | 1.2 | - | - | - | - | 5.7 | [34] |
| Shandong | Sintering | 22.0 | 6.4 | 9.0 | 41.9 | 3.2 | 2.8 | 1.7 | 0.3 | - | - | - | - | 11.7 | [30] |
| Shandong | Sintering | 22.7 | 7.7 | 11.0 | 40.8 | 3.3 | 2.9 | 1.8 | 0.4 | - | - | - | - | 11.8 | [35] |
| Yunnan | Bayer | 11.2 | 17.5 | 35.3 | 12.4 | 2.4 | 8.1 | 1.6 | - | - | - | - | - | 10.0 | [36] |
| Yunnan | Bayer | 8.6 | 18.2 | 29.4 | 11.0 | 0.1 | 3.2 | - | 0.1 | - | - | 9.3 | - | - | [29] |
| Shanxi | Combined | 22.2 | 10.5 | 6.8 | 42.3 | 2.6 | 3.0 | 2.5 | 0.9 | - | - | - | - | - | [5] |
| Shanxi | Sintering | 18.1 | 9.2 | 4.7 | 38.1 | 6.7 | 4.0 | - | - | - | - | - | - | 12.3 | [37] |
| Shanxi | Bayer | 17.4 | 23.6 | 4.2 | 20.2 | 6.9 | 8.6 | - | - | - | - | - | - | 11.5 | [37] |
| Shanxi | Bayer | 16.7 | 23.5 | 9.2 | 16.1 | 4.8 | 6.3 | - | - | - | - | - | - | 12.2 | [37] |
| Shanxi | Sintering | 16.4 | 6.8 | 7.6 | 33.1 | 2.5 | 3.0 | 1.7 | 0.2 | - | - | - | - | - | [24] |
| Shanxi | Combined | 21.4 | 8.2 | 8.1 | 46.8 | 2.9 | 2.8 | 1.7 | 0.2 | - | - | - | - | - | [32] |
| Shanxi | Bayer | 17.8 | 24.7 | 10.4 | 15.7 | 5.4 | 9.8 | 0.9 | 0.6 | - | - | - | - | - | [32] |
| Guizhou | Bayer | 16.7 | 33.2 | 8.2 | 19.6 | 4.3 | 16.2 | 0.7 | 0.6 | - | - | - | - | 1.7 | [34] |
| Guizhou8 | Bayer | 14.3 | 20.0 | 16.0 | 20.0 | 5.5 | 9.2 | 0.9 | 2.0 | - | - | - | - | 12.3 | [34] |
| Guizhou | Bayer | 15.7 | 27.3 | 7.7 | 21.5 | 4.8 | 15.4 | 1.7 | 2.8 | - | - | - | - | 3.8 | [34] |
| Guizhou | Sintering | 20.4 | 10.8 | 9.1 | 34.3 | 4.1 | 5.3 | 1.2 | 5.3 | - | - | - | - | 14.1 | [34] |
| Guizhou | Bayer | 12.4 | 31.0 | 2.5 | 23.7 | 5.7 | 4.3 | 0.7 | 0.5 | - | - | - | - | 16.5 | [31] |
| Guizhou | Sintering | 21.0 | 8.1 | 6.2 | 45.1 | 5.2 | 2.8 | - | 0.1 | - | - | - | - | 9.4 | [31] |