广西某难选铅锌矿铅锌分离试验

广西某铅锌矿属铅低锌高、微细粒嵌布的难分离铅锌矿,铅品位为0.88%、锌品位为9.19%。主要含锌矿物为闪锌矿,含铅矿物较复杂,主要为脆硫锑铅矿、硫锑铅矿和方铅矿,且嵌布粒度极微细。为了高效开发利用该矿石资源,对该矿石进行了铅、锌分离回收试验研究。结果表明:在磨矿细度为-0.074 mm占80%的情况下,采用1粗2扫3精选铅,1粗2扫3精选锌,铅、锌1次精选尾矿和1次扫选精矿合并返回再磨,其余中矿顺序返回流程处理该矿石,最终获得了锌品位为48.05%、锌回收率为91.13%的锌精矿,以及铅品位为26.63%、锑品位为21.80%、铅回收率为87.46%、锑回收率为86.30%的铅锑精矿,铅锑精矿铅含量较低的原因与矿石中主要含铅矿物脆硫锑铅矿和硫锑铅矿理论含铅量较低、嵌布粒度极微细有关,不适合细磨深选。

Experiment on Lead-Zinc Separation of a Refractory Lead-Zinc Ore from Guangxi

A lead-zinc mine in Guangxi belongs to refractory mine with low lead of 0.88% and high zinc of 9.19% in fine dissemination. The main Zn-containing mineral is sphalerite,and Pb-containing minerals are complex,including jamesonite,boulangerite and galena in very fine dissemination. In order to realize the high efficient exploitation and utilization of the resources,beneficiation tests of lead and zinc separation of the ore were made. Results showed that under the grinding fineness of 80% -0.074 mm,zinc concentrate with Zn grade of 48.05% and zinc recovery of 91.13%， and lead-antimony concentrate with lead grade of 26.63%， antimony grade of 21.80%， lead recovery rate of 87.46% and antimony recovery of 86.30% were obtained respectively by the process of lead concentration by one roughing，two scavenging and three cleaning，zinc concentration by one roughing，two scavenging and three cleaning，mixture of one cleaning of lead-zinc tailing and one scavenging of lead-zinc concentrate back to regrinding，and the rest middlings back to the flow-sheet in turn. The reason for low content of lead in lead-antimony concentrate is that the main lead-containing minerals，jamesonite and boulangerite，contain low lead content in theory with fine disseminated particle，which are not suitable for fine grinding and deep concentration.