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Outline
Based on the tailings-free mine concept, beneficiation and comprehensive utilization of tailings resources were studied for a magmatic hydrothermal gold mine in Hunan. A tailings-free mine technical system was established, adopting the process of gold recovery by a gravity-flotation combined process, quartz comprehensive recovery from gold tailings, and full-volume backfill of residual tailings. The technical route is as follows: gold is efficiently recovered via a vertical centrifuge gravity-flotation combined process, and a gold concentrate with an Au grade of 81.69 g/t and a recovery rate of 97.06% is obtained. Quartz is recovered from gold tailings by the desliming-high intensity magnetic separation-reverse flotation process, and a quartz concentrate with an SiO2 grade of 98.86% and a recovery rate of 65.37% is obtained. The residual tailings with a yield of 38.23% are all applied to underground backfill. The process innovation effectively solves the problem of tailings disposal, realizes full-component resource utilization of ore and zero tailings discharge, and provides a technical reference for the green development of similar mines.
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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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