Full
Outline
A certain magnetite ore in Zimbabwe has a TFe grade of 42.01%, with fine particle size and high content of silicate minerals. To achieve effective dissociation of iron minerals and gangue, as well as improve the recovery rate of iron resources, a combined process of weak magnetic-strong magnetic-reverse flotation was adopted for experimental research. Through the grinding fineness test, it was determined that the coarse grinding fineness was −0.074 mm, accounting for 81%. The weak magnetic concentrate was further ground to −0.037 mm, accounting for 90%, and the strong magnetic concentrate was further ground to −0.037 mm, accounting for 85%. The magnetic field strength test results show that magnetic field strengths of four weak magnetic operations are 0.33 T, 0.20 T, 0.15 T and 0.10 T, respectively. When the magnetic field strength of the strong magnetic operation is 1.0 T, weak magnetic concentrate with a Fe grade of 62.26% and a Fe recovery rate of 12.25% and strong magnetic concentrate with a Fe grade of 51.32% and a Fe recovery rate of 64.76% could be obtained. For the strong magnetic concentrate, the optimized reagent system through reverse flotation condition experiments is determined with slurry pH of 11.0, corn starch dosage of 500 g/t, CaO dosage of 800 g/t, and self-developed collector CK-T1 dosage of 300 g/t. The closed-circuit test adopts the process of one coarse, two fine, and two scans, and the final Fe grade of the iron concentrate is increased to 65.95%, with a Fe recovery rate of 81.45%. Research has shown that the combination of fine grinding and weak magnetic-strong magnetic-reverse flotation processes can significantly improve the sorting efficiency of fine-grained magnetite, providing a technical reference for the efficient recovery of similar refractory ores.
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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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