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A high-pressure grinding roll (HPGR) was adopted for dry milling of the weakly magnetic iron ore from Jingtieshan prior to magnetizing roasting. The results indicate that compared to wet milling, the dry milling process can reduce production costs and energy consumption. The extrusion pressure of the HPGR exerts a direct impact on the shape of the obtained cake and the subsequent breaking process. In contrast to single extrusion, multiple extrusions lead to a significant reduction in power consumption of the main machine. With the pressure of 4 MPa, the final powder with approximately 53% of passing size of-0.074 mm will require the main machine with power consumption of 6.74 kWh/t, and a circulating load of about 330%. It can meet the requirement of particle size for the subsequent roasting process.
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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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