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Aiming at a carbon-in-leach tailings with relatively high gold grade in Hebei Province, based on the analysis of physicochemical properties and gold chemical phase, the process of ultrafine grinding-chemical pre-oxidation-cyanide leaching was adopted to extract gold from the tailings. The effects of ultrafine grinding fineness, pulp pH, sodium cyanide dosage, leaching temperature and time on gold extraction were investigated, and the kinetics of the chemical pre-oxidation-cyanide leaching process was discussed. The results show that under the conditions of ultrafine grinding fineness of -10 μm accounting of 80%, pre-oxidation of 14 h at an air flow rate of 0.3 m3/h, followed by cyanide leaching with sodium cyanide dosage of 1.5 kg/t, leaching time of 24 h, pulp pH of 12.5, leaching temperature of 303 K, and air flow rate of 0.1 m3/h, the gold leaching rate can reach 70.23%. The kinetic results indicate that the gold leaching process conforms to the classical unreacted shrinking core model, and the leaching reaction rate is controlled by the mixed control of interfacial chemical reaction and diffusion. The SEM and gold chemical phase analysis of the leaching residue show that there exist extremely finely disseminated gold or lattice gold in the carbon-in-leach tailings, which are difficult to leach. The research results can provide certain theoretical guidance and technical reference for further gold extraction from these tailings.
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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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