西北某难选铅锌矿石浮选试验

Flotation Experiments on a Refractory Lead-zinc Ore in Northwestern China

西北某铅锌矿是一个矿物成分复杂、铅锌矿物分布极不均匀、嵌布粒度细微、嵌布关系复杂、单体解离难度大、脉石矿物硬度高的大型难选铅锌矿床。为确定该资源的开发利用方案,采用优先浮选工艺对该矿石进行了选矿试验。结果表明,在磨矿细度为-0.074 mm占85%的情况下,采用1粗1扫3精选铅(铅精选前再磨至-0.045mm占95%)、1粗1扫2精选锌、中矿顺序返回的闭路流程处理该矿石,可取得铅品位为60.45%、含锌8.90%、铅回收率为75.95%的铅精矿以及锌品位为51.60%、含铅0.31%、锌回收率为87.39%的锌精矿,该选矿工艺方案是该矿石的高效开发利用方案。

A lead-zinc mine in northwestern China is a large-scale refractory Pb-Zn deposit with characteristics of com- plex mineral composition, uneven lead-zinc mineral distribution, micro-grained and complex dissemination, difficulty in libera- ting monomer mineral and hard gangue mineral. In order to determine the utilization scheme about the Pb-Zn deposit, experi- mental study on the ore is made by adopting the preferential flotation process. The results indicate that under the conditions of grinding fineness of 85% -0.074 mm,lead concentrate with Pb grade of 60.45% ,Zn grade of 8.90% and lead recovery of 75, 95%, and zinc concentrate with Zn grade of 51.60% ,Pb grade of 0.31% and zinc recovery of 87.39% were obtained re- spectively with closed circuit process of lead concentration by one roughing, one scavenging and three cleaning （ regrinding to 95% -0.045 mm before the cleaning）, zinc concentration by one roughing, one scavenging and two cleaning process, and middlings returning to the flow-sheet in order. The process is an efficient utilization scheme for this ore.