低品位氧化铅锌矿物的浮选回收试验研究

Experimental Research on Recovering Low Grade Oxidized Lead-Zinc Ore by Flotation

针对山东某低品位铅锌矿,通过X射线衍射分析(XRD)和扫描电镜分析(SEM)确定铅矿物主要以白铅矿的形式存在,锌矿物主要以钙锌白云石、菱锌矿和硅锌矿的形式存在。通过试验研究了磨矿细度对铅锌回收率的影响,确定最佳磨矿细度为-0.074 mm占84%,然后添加Na2S对铅锌矿物进行硫化处理,在不添加锌抑制剂的情况下直接用丁基黄药和乙硫氮对铅矿物进行捕收,铅品位从原矿中的0.88%提高至57.11%,铅回收率达到61.17%。选铅尾矿用Cu SO4对锌进行活化,然后用丁基黄药对锌矿物进行捕收,得到锌回收率为31.45%、锌品位为35.24%的锌精矿,使铅锌得到较好分离。试验结果表明,硫化作用对解离的氧化铅矿物活化作用较大,在最佳磨矿细度下,能够获得较好的回收率。

A low grade lead-zinc ore in Shandong Province was examined by XRD and SEM, the results showed that lead mineral exist mainly as cerusite and zinc minerals exist mainly as dolomite, smithsonite and willemite. The effect of grinding fineness on the recovery of lead and zinc was studied.At the optimal grinding fineness of 84% （-0.074 mm）, the lead-zinc ore was treated by sodium sulfide, followed by butyl xanthate and ethyl dithio carbamate as combined collectors and terpenic oil as frother.As a result that the lead concentrate with recovery rate of 61.17% and grade of 57.11% was obtained.The lead tailing was treated with copper sulfate to activate zinc ore, followed by butyl xanthate as collector and terpenic oil as frother, the result showed that the zinc concentrate with recovery rate of 31.45% and grade of 35.24% was obtained,achieving a satisfactory separation result. Experimental results show that the effect of vulcanization is larger on the activation of dissociation lead oxide minerals, and a good recovery rate can be obtained under the condition of the best grinding fineness.