Full
Outline
Due to the unique coal forming environment, the contents of alkali metals and alkaline earth metals in Zhundong coal are high, and some mining areas are accompanied by problems such as high iron and high calcium. These elements can cause boiler slagging and pollution during coal combustion, greatly limiting the development and utilization of Zhundong coal. In order to achieve efficient and clean utilization of Zhundong coal and fundamentally reduce the content of alkali metals and iron in Zhundong coal, it has been demonstrated that Fe2O3 in coal ash mainly comes from associated minerals of coal. Therefore, by sorting and reducing the content of coal ash, iron elements in coal can be removed to a certain extent. Several mature sorting technologies were compared and analyzed, it was found that due to the brittle nature of coal in the West Black Mountain mining area of Zhundong coalfield and its susceptibility to water, and it is difficult to improve its quality and utilization through wet sorting technology. The cost of magnetic separation technology equipment is high and the feeding particle size is small, which not only increases the crushing cost, but also doesn't conform to the actual production and sales situation of coal mines. The profit level and production of the composite dry sorting machine are relatively high, which meets the actual production needs of coal mines. It is recommended to use the the composite dry separation technology to improve the quality and reduce iron content of raw coal in the mining area. The composite dry separation technology can reduce about 30% of Fe2O3 of the raw coal ash in the research area, and the sorted clean coal can be subjected to powdering treatment to reduce the iron content in the clean coal to below 20%, thereby meeting the market demand.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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