Research Article
Microstructure of Coal Gangue and Precipitation of Heavy Metal Elements
Table 2
Chemical composition of coal gangue (%).
| Sample | Na2O | MgO | Al2O3 | SiO2 | K2O | CaO | Fe2O3 | P | S |
| Fresh coal gangue | 0.65 | 1.8 | 20.7 | 59.9 | 2.4 | 2.0 | 6.7 | 0.05 | 1.53 | Weathered coal gangue | 0.41 | 1.4 | 17.6 | 53.7 | 2.0 | 1.3 | 5.4 | 0.06 | 0.44 |
| | F | Ba | Mn | Cu | Pb | Zn | Ti | Cl | F |
| Fresh coal gangue | ≤0.045 | 0.10 | 0.054 | 0.0006 | <0.0002 | 0.009 | 0.50 | 0.011 | ≤0.045 | Weathered coal gangue | <0.045 | ≤0.002 | 0.043 | 0.0005 | <0.0002 | 0.005 | 0.42 | 0.009 | <0.045 |
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