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Platinum group metals (PGMs) occurs as associated elements in Jinchuan copper-nickel ores and are always recovered together with copper and nickel by flotation. Nevertheless, substantial amounts of PGMs are still lost into tailings, leading to tailings containing 0.07 g/t Pt, 0.06 g/t Pd, alongside 0.074 5 g/t Au and 5.54 g/t Ag. It is found that platinum and palladium mainly exist in the forms of michenerite, merenskyite, and Pd- and Pt-bearing bismuthotelluride minerals, finely disseminated and mostly encapsulated by silicate gangue, valleriite, pyrrhotite and other minerals. With those features taken into consideration, experimental investigations on PGM enrichment were carried out by multi-cycle gravity concentration with fabric-lined sluice. The results show that after five cycles of gravity concentration via fabric-lined sluice followed by grinding and re-concentration, the final tailings are obtained with the grades of Pt and Au decreased to 0.02 g/t and 0.05 g/t at recoveries of 74.48% and 53.04%, respectively. A combined separation process consisting of gravity concentration with fabric-lined sluice, shaking table concentration and low-intensity magnetic separation can lead to Pd primarily enriched into magnetic products, while Pt and Au concentrated in shaking table concentrates. This provides a feasible technical idea and research direction for the efficient recovery and utilization of PGMs in this type of 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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