青海某硫化铅锌矿选矿工艺优化研究

青海某铅锌硫化矿石选矿厂采用中性介质下优先浮铅-锌硫混浮-锌硫分离工艺流程处理矿石,导致生产不够稳定,选矿指标不理想。为解决此问题,采用中性介质下优先选铅-碱性介质下优先选锌-硫酸调浆再选硫的原则流程进行了选矿试验。结果表明:矿石在磨矿细度为-0.074 mm占55%的情况下,采用1粗2精1扫选铅、1粗2精1扫选锌、1次浮选选硫流程处理矿石,获得了铅品位为70.72%、含锌2.14%、含硫19.98%、含金1.92 g/t、含银1 322.45 g/t,铅回收率为91.78%、金回收率为14.28%、银回收率为76.29%的铅精矿;锌品位为48.86%、含铅0.26%、含硫32.67%,锌回收率为97.88%的锌精矿;硫品位为47.44%、含金0.67 g/t、含铅0.11%、含锌0.17%,硫回收率为64.14%、金回收率为80.86%的硫精矿。新工艺流程更简洁,生产更稳定顺畅,电耗和药剂成本均有所下降,在铅、锌精矿质量指标相当的情况下,铅、锌回收率分别提高了0.50和4.32个百分点,伴生金银和硫精矿指标也得到了改善。

Optimization Research of a Lead-zinc Sulfide Ore Beneficiation Process in Qinghai

Preferential flotation of lead at neutral medium， mixed flotation of zinc-sulfur and separation of zinc-sulfur process were adopted to treat ores in a lead-zinc sulfide ores concentrator of Qinghai province， which caused unstable production and unsatisfactory index. In order to solve the problems， beneficial tests was carried out in the process of preferential flotation of lead at neutral medium， preferential flotation of zinc at alkaline medium and sulfur separation after pulp condition with sulfuric acid. The results indicated that in the case of grinding fineness of -0.074 mm accounting for 55%， lead was selected with one roughing-two cleaning-one scavenging， zinc was selected with one roughing-two cleaning-one scavenging and sulfur was selected with one flotation. The lead concentrate was obtained with lead grade of 70.72%， zinc grade of 2.14%， sulfur grade of 19.98%， gold grade of 1.92 g/t， silver grade of 1 322.45 g/t， lead recovery of 91.78%， gold recovery of 14.28% and silver recovery of 76.29%. The zinc concentrate was obtained with zinc grade of 48.86%， lead grade of 0.26%， sulfur grade of 32.67% and zinc recovery of 97.88%. The sulfur concentrate was obtained with sulfur grade of 47.44%， gold grade of 0.67 g/t， lead grade of 0.11%， zinc grade of 0.17%， sulfur recovery of 64.14% and gold recovery of 80.86%. The new process is more concise， and the production is more stable and smooth. Also， power consumption and reagent costs are reduced. In the same grade index of lead and zinc， the recovery of lead and zinc were increased by 0.50 and 4.32 percentage points， respectively. In addition， the flotation index of associated gold and silver were improved.