Full
Outline
In view of the situation that the graphite contained in graphite tailings is not fully recovered, experiments on graphite recovery were carried out on graphite tailings from a certain area in Heilongjiang with a fixed carbon content of 3.40%. The properties of graphite tailings were investigated by chemical multi-element analysis, XRD analysis and optical microscopy analysis methods. On this basis, roughing condition experiments and stage grinding-stage separation experiments of graphite tailings were carried out. The results indicate that graphite in the tailings mostly occurs in the form of inclusions or paragenesis adjacent to other minerals. Graphite particles vary in size and are mostly distributed in the +0.09 mm size fraction of the tailings. To fully liberate graphite from the tailings and avoid argillization, a multi-stage grinding and multi-stage separation flowsheet should be adopted. When the grinding fineness of the -200 mesh content is 29.52%, the flotation mass concentration is 20%, the kerosene dosage is 300 g/t, and the No.2 oil dosage is 50 g/t, graphite rough concentrate with a fixed carbon content of 15.62% and a recovery rate of 72.88% is obtained. A closed-circuit flotation test was carried out on the graphite tailings by adopting the process of four-stage grinding, one roughing, five cleaning, and combined middlings returning. Graphite concentrate with a fixed carbon content of 81.33% and a recovery rate of 61.51% is obtained.
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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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