Research Article
Microstructure of Coal Gangue and Precipitation of Heavy Metal Elements
Table 3
Experimental design.
| | Sample | Weathering degrees | pH |
| | Number 1 | Fresh coal gangue | 5 | | Number 2 | 7 | | Number 3 | 9 |
| | Number 4 | Weathered coal gangue | 5 | | Number 5 | 7 | | Number 6 | 9 |
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