Research Article
Study on Change Rules of Factors Affecting Gas Loss during Coalbed Air Reverse Circulation Sampling
Table 2
Particle size distribution after the mixed coal sample tests.
| Sample size | ≤1 mm (%) | 1–3 mm (%) | 3-4 mm (%) | 4-5 mm | 5-6 mm | 6-7 mm | 7-8 mm |
| 1 # coal sample | 62.32 | 32.54 | 2.06 | 1.83% | 1.24% | 0 | 0 | 2 # coal sample | 65.91 | 29.42 | 3.97 | 0.70% | 0 | 0 | 0 | 3 # coal sample | 64.74 | 29.41 | 3.61 | 0 | 2.24% | 0 | 0 | 4 # coal sample | 64.82 | 28.05 | 5.33 | 1.11% | 0.69% | 0 | 0 |
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