Abstract: Mineralogy and beneficiation of a stanniferous multi-metallic sulphide ore in Yunnan were studied. The results show that the content of lead and zinc in the ore is low, which have the nature of uneven dissemination sizes. The lead minerals are closely associated with zinc ones, so the selective flotation of lead minerals is firstly adopted, and flotation of zinc ones followed, based on the character of big floatability difference between lead and zinc minerals. Ethyl xanthate is adopted as the collector of lead, and lime, sodium sulfite and zinc sulfate as the depressors of zinc and sulphur minerals for selective flotation of lead minerals, and copper sulfate as the activator of sphalerite for flotation of zinc minerals from the tailings of lead flotation. Cassiterite has closely symbiotic relationship with pyrite and pyrrhotite with very small particle sizes. The gravity-magnetic combined flow sheet is adopted to recover tin minerals from the tailings of selective flotation of zinc following the desulfurization flotation. After the closed circuit flotation experiments, the lead concentrate containing 40.92% lead is obtained with lead recovery rate of 81.25%, silver enrichment of 1610.53 g/t and silver recovery rate of 77.03%, zinc concentrate containing 43.23% zinc with zinc recovery rate of 85.92%, sulphur concentrate containing 42.57% sulphur with sulphur operation recovery rate of 87.65%, and tin concentrate containing 42.38% tin with tin operation recovery rate of 59.29%.

Key words: multi-metallic sulphide ore, mineralogy, selective flotation, gravity-magnetic combined flow sheet, lead, zinc

摘要： 对云南某含锡多金属硫化矿进行了工艺矿物学和选矿实验研究. 结果表明，矿石中铅锌品位低，铅、锌矿物相互交代、包裹，嵌布粒度不均匀，采用优先浮铅、再选锌的原则流程，利用铅矿物与锌、硫矿物间可浮性差异较大的特点，采用石灰、亚硫酸钠和硫酸锌抑制锌、硫，以乙基黄药为铅捕收剂优先浮选铅矿物，选铅尾矿用硫酸铜作活化剂活化闪锌矿选锌；锡矿物与黄铁矿、磁黄铁矿等矿物共生关系复杂，且嵌布粒度较细，选锌尾矿经脱硫浮选后采用重磁联合流程回收锡矿物. 通过闭路实验，得到含铅40.92%、银1610.53 g/t、铅回收率81.25%、银回收率77.03%的铅精矿，锌精矿含锌43.23%、回收率为85.92%，硫精矿含硫42.57%，作业回收率为87.65%，锡精矿含锡42.38%，作业回收率为59.29%.

关键词: 多金属硫化矿, 矿物学, 优先浮选, 重磁联合流程, 铅, 锌