Research Article
Microstructure of Coal Gangue and Precipitation of Heavy Metal Elements
Table 1
Mineral composition of fresh and weathered coal gangue (%).
| | Sample | Quartz | Kaolinite | Illite | Illite-montmorillonite mixed layer | Smectite | Chlorite |
| | Fresh coal gangue | 20 | 33 | 5 | 8 | 2 | 2 | | Weathered coal gangue | 21 | 42 | 15 | 6 | 2 | 3 |
| | | Feldspar | Dolomite | Calcite | Siderite | Pyrite | Coal |
| | Fresh coal gangue | 20 | 0.5 | 0.5 | 1.3 | 1.6 | 6 | | Weathered coal gangue | 5 | 1 | 0.2 | 1 | 0 | 3.7 |
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