西北某难处理硫化铜锌矿石浮选试验

西北某铜锌矿石矿物种类繁多、铜锌矿物及其与脉石矿物嵌布关系复杂，单体解离难度大且锌矿物极易上浮，属于典型的难处理铜锌矿。为了合理开发利用该矿石资源，采用优先浮选工艺进行了选矿试验。结果表明：矿石在磨矿细度为-0.074 mm占85%的情况下，采用1粗1扫选铜、铜粗精矿再磨至-0.045 mm占85%后再3次精选、选铜尾矿1粗1扫2精选锌、中矿顺序返回闭路流程处理，可获得铜品位为20.15%、含银576.40 g/t、含锌4.66%、铜回收率为77.32%、银回收率为46.67%的铜精矿，以及锌品位为45.21%、含银153.80 g/t、含铜0.52%、锌回收率为86.15%、银回收率为44.73%的锌精矿。试验取得了理想的铜锌银回收效果。

Flotation Experiment on a Refractory Copper-Zinc Sulfide Ore from Northwest China

A copper-zinc ore in Northwest China belongs to a typical refractory copper-zinc deposit with characteristics of complex mineral composition，copper-zinc mineral complex disseminated with gangue，and difficult to be separated and sphalerite easy to be floated.In order to develop and utilize the ore reasonably，beneficiation experiment on the ore was made by adopting the preferential flotation process.The results indicated that under the conditions of grinding fineness of 85% -0.074 mm，copper concentrate with Cu grade of 20.15%，Ag grade of 576.40 g/t，zinc grade of 4.66% and copper recovery of 77.32%，silver recovery of 46.67%，and zinc concentrate with zinc grade of 45.21%，Ag grade of 153.80 g/t，copper grade of 0.52% and zinc recovery of 86.15%，silver recovery of 44.73% were obtained respectively with closed-circuit process of copper floating by one roughing-one scavenging，reground the copper rough concentrate to 85% -0.045 mm and then endure three cleaning flotation operation，zinc floating by one roughing-two cleaning-one scavenging process，and middlings return to the flow-sheet in order.Good recovery index of copper，zinc，and silver were achieved from the tests.