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A polymetallic sulfide ore in Qinghai assays 1.45% lead and 2.64% zinc, and is associated with copper, sulfur, iron, plus rare and precious metals (gold and silver). Process mineralogy of the ore was studied by multi-elemental analysis, phase analysis, and MLA (Mineral Liberation Analyzer) analysis. A closed-circuit test was performed after condition tests on this basis. In the general mineral processing of lead-zinc sulfide ores, lime is added through the whole flow, which is not conducive to comprehensive utilization and recovery of copper, gold and silver. Aiming at this problem, a processing concept was proposed for comprehensive utilization of the valuable elements therein, which consists of preferential flotation of lead under natural pH value, zinc flotation by inhibiting sulfur from the obtained lead flotation tailings, and finally iron recovery after sulfur removal of the tailings from the previous step. Results show that with the polymetallic sulfide ore ground to a fineness of -0.074 mm 70%, the valuable elements therein can be recovered for comprehensive utilization by adopting a combined flotation and magnetic separation process, consisting of copper-lead flotation, zinc recovery from the obtained copper-lead flotation tailings, sulfur recovery from the obtained zinc flotation tailings, and finally iron separation from the obtained tailings. It is shown that the lead concentrate grading 60.12% at recovery of 94.72%, zinc concentrate grading 46.99% Zn at recovery of 88.26% and iron concentrate grading 67.22% Fe at recovery of 9.33% are produced.
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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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