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In response to the issue of low cobalt leaching rate from oxidized copper-cobalt ore in the Kambove mining area of Congo(DRC), the mineralogical characteristics of the ore were analyzed by Mineral Liberation Analysis (MLA), polarized light microscopy, and Scanning Electron Microscopy (SEM). Based on the findings, leaching of cobalt from the ore with sodium pyrosulfite, Fe powder and SO2 as reducing agents was studied. The influence of different reducing agents and dosage on the leaching effect was investigated. The resluts reveal that the primary copper minerals in the ore are pseudomalachite, malachite, and libethenite, while the main cobalt minerals are copper-cobalt-bearing manganese oxide and heterogenite. The gangue minerals predominantly consist of siltstone, quartz, sericite, and chlorite. The occurrence states of copper and cobalt in the ore are complex, with cobalt minerals being fine-grained and mostly occurring as inclusions. The theoretical leaching rate of cobalt is calculated to be 92.82%. Compared with the three reducing agents, the leaching effect of SO2 is better. Under the optimal conditions of liquid volume to solid mass ratio of 3∶1, sulfuric acid dosage of 26.7 g/L, SO2 amount at 1.7 times the theoretical amount, reaction temperature of 38 ℃, and reaction duration of 3 h, the cobalt leaching rate can reach 85.48%, approaching the theoretical maximum. The research results can provide both theoretical and technical support for the efficient utilization of cobalt resources in the Kambove mining area of Congo(DRC).
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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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