Full
Outline
Blank roasting-carbon leaching process was used to extract gold from low-grade gold cyanide tailings in a certain place. The effects of roasting temperature, roasting time, dosage of 'Jinchan' mineral processing agent, leaching time and liquid volume to solid mass ratio on gold leaching rate were investigated. On the basis of small-scale experiments, an expanded experiment was carried out. The results show that the optimal roasting process parameters are roasting temperature of 550 ℃ and roasting time of 20 min. The optimum carbon leaching process parameters are as follows：dosage of 'Jinchan' mineral processing agent is 500 g/t, leaching time is 12 h, pulp pH is 12, bottom carbon density is 15 g/L, and liquid volume to solid mass ratio is 2∶1. Under the optimized roasting-carben leaching process parameters, Au leaching rate can reach more than 60%, which is significantly higher than the gold leaching rate obtained by direct leaching of cyanidation leaching residue without roasting. During the continuous operation of the rotary kiln roasting expansion test, the Au grade in each calcine process sample and the corresponding Au grade in the leaching residue fluctuate little, and the corresponding Au leaching rate is between 59.79% and 62.11%, and the continuous operation index is stable. The method can provide a technical reference for the recovery of gold from low-grade gold cyanide 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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