Full
Outline
The grades of gold, silver, copper, lead, zinc, sulfur and iron in a low-grade polymetallic sulfide ore in western Yunnan are 1.92 g/t, 41.31 g/t, 0.39%, 1.20%, 0.42%, 9.54% and 34.92% respectively, and the content of harmful element As is 0.22%. The low-grade polymetallic sulfide ore has low grade of valuable elements, complex occurrence state, many kinds of minerals, uneven dissemination size, and difficult comprehensive recovery. The genetic characteristics of the ore, including the composition and relative content of main minerals, the dissemination relationship of the main minerals, grain size and liberation characteristics, as well as the occurrence states of gold, silver, copper, lead, zinc, sulfur and iron, were systematically investigated and determined using chemical analysis and chemical phase analysis. Based on this, the principle process of "copper-lead mixed flotation, copper-lead separation, zinc-sulfur mixed flotation, zinc-sulfur separation, and low-intensity magnetic separation for iron" was proposed. The results of laboratory process verification test show that under the condition of grinding fineness of -0.074 mm accounting for 90%, the concentrates are obtained as follows, copper concentrate with a copper grade of 21.19%, gold grade of 52.40 g/t, silver grade of 558 g/t, and copper recovery of 74.50%; lead concentrate with a lead grade of 74.66%, gold grade of 24.85 g/t, silver grade of 1 730 g/t, and lead recovery of 82.54%; zinc concentrate with a zinc grade of 46.27% and zinc recovery of 76.88%; sulfur concentrate with a sulfur grade of 45.54% and sulfur recovery of 81.91%; as well as magnetite concentrate with an iron grade of 63.47% and iron recovery of 36.87%.
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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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