Table 3.
Geochemical analysis, carbon and sulfur contents and ash yield, stratified by fuel type and source (median values).
| Major coal type |
County | Coal sub-type | Coal mine | N | S1 (mg HC/g coal) |
S2 (mg HC/g coal) |
Tmax (°C) |
Total carbon (%) |
Inorganic carbon (%) |
Organic carbon (%) |
Total sulfur (%) |
Ash yield (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Smoky | Xuanwei | Coking coal | 116 | 2.15 ^ | 71. 5 ^ | 460 ^ | 59.39 | 0.5 | 58.81 | 0.24 ^ | 32 | |
| 65 | 2.35 | 73.24 | 462 | 60.76 | 0.53 | 60.46 | 0.2 | 32 | ||||
| 63 | 2.34* | 73.24* | 462* | 60.76* | 0.52* | 60.46* | 0.2 | 33 | ||||
| Azhi | 15 | 2.52 | 75.62 | 462 | 65.53 | 0.92 | 64.6 | 0.23 | 30 | |||
| Baoshan | 5 | 2.24 | 61.59 | 463 | 57.3 | 0.64 | 54.17 | 0.18 | 37 | |||
| Laibin | 14 | 2.23 | 76.14 | 459.5 | 55.76 | 0.57 | 54.97 | 0.28 | 35 | |||
| Tangtang | 22 | 1.62 | 61.98 | 464 | 55.7 | 0.19 | 55.22 | 0.18 | 38 | |||
| Yangchang | 7 | 4.03 | 138.69 | 443 | 70.12 | 0.32 | 69.77 | 0.19 | 23 | |||
| Fuyuan | Coking coal | 51 | 1.95 | 68.86 + | 452 + | 57.28 + | 0.43 + | 55.79 + | 0.34 | 29 + | ||
| 15 | 1.89 | 43.96 | 467 | 50.83 | 1.8 | 46.42 | 0.24 | 36 | ||||
| Daping | 4 | 2.34 | 33.9 | 458.5 | 43.58 | 0.8 | 42.74 | 0.29 | 40 | |||
| Enhong | 4 | 1.73 | 40.53 | 469.5 | 50.23 | 5.56 | 42.26 | 0.74 | 51 | |||
| Haidan | 6 | 1.78 | 46.75 | 468 | 46.29 | 3.01 | 43.28 | 0.19 | 32 | |||
| Zude | 1 | 4.21 | 61.02 | 473 | 64.15 | 0.4 | 63.75 | 0.87 | 23 | |||
| 1/3 coking | 8 | 1.98 | 52.35 | 459* | 54.33 | 0.34 | 53.67 | 0.36* | 29 | |||
| Bagong | 5 | 1.7 | 47.19 | 465 | 53.32 | 0.13 | 52.14 | 1.88 | 29 | |||
| Dahe | 3 | 3.08 | 80.18 | 445 | 65.46 | 0.43 | 64.89 | 0.16 | 25 | |||
| Gas fat | 23 | 1.97 | 131.87 | 433 | 64.34 | 0.2 | 63.7 | 0.39 | 24 | |||
| Housuo | 20 | 2.03 | 138.44 | 433.5 | 63.98 | 0.24 | 63.6 | 0.4 | 25 | |||
| Qingyun | 3 | 1.62 | 110.4 | 431 | 65.88 | 0.12 | 65.83 | 0.29 | 29 | |||
| Meagre lean | Gumu | 1 | 3.83 | 53.43 | 469 | 54.7 | 1.4 | 53.3 | 0.53 | 47 | ||
| Smokeless | 29 | 0.29 | 8.39 * | 581 | 57.41 * | 0.3 | 56.92 * | 1.03 * | 32 | |||
| Fuyuan | LaoChang | 19 | 0.28 | 9.47 | 571 | 57.41 | 0.22 | 57.33 | 1.03 | 31 | ||
| Xuanwei | RSXZ | 5 | 0.29 | 6.49 | 572 | 46.17 | 0.15 | 45.81 | 2.83 | 41 |
S1: mg of hydrocarbons (per gram of coal) released under controlled burning at 300 °C.
S2: mg of hydrocarbons (per gram of coal) released during maximal release of hydrocarbons under controlled burning.
Tmax: temperature at which S2 occurs.
Italicized values indicate overall value for each county.
^
Statistically significant variation between smoky & smokeless coal types.
+
Significant variation within smoky coal subtypes for that region.
*
Significant variation between mines within that coal type in that region.