Full
Outline
In order to investigate the crushing properties and energy conversion law of magnetite ore under impact load, taking magnetite ore with different iron-silicon ratios as the research object, the impact crushing test on magnetite ore with different iron-silicon ratios was carried out using split Hopkinson pressure bar to analyze the destructive deformation characteristics, compressive strength and energy conversion law of magnetite ore under different incident stresses, and to reveal the macro-micro crushing mechanism by combining with scanning electron microscope technology. The results show that under the impact load, the stress-strain curves of magnetite ore with different iron-silicon ratios do not have a compression-density phase, and the elasticity modulus, peak stress, and dynamic compressive strength all decrease with the increase of the iron-silicon ratio, and the dissipation energies of the three iron-silicon ratios of magnetite ore increase with the increase of the iron-silicon ratio and the incident energy. With the increase of incident stress, the diameter of the ore fragments is decreasing, the intergranular cracks and transgranular cracks in magnetite ore are increasing, and the width and length of cracks increase with the increase of iron-silicon ratio. When the incident stress is the same, the ore fragments with a large iron-silicon ratio are smaller than those with a small iron-silicon ratio. Therefore, in the actual production of mines, magnetic iron with different iron-silicon ratio can be crushed in batches, which can improve the energy utilisation to a certain extent.
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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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