选冶联合工艺回收云南某铅锌尾渣中Pb和Zn

云南个旧某铅锌尾渣含铅9.87%、含锌6.25%,铅、锌多与脉石相互包裹,导致铅、锌分离较为困难。为回收该尾渣中铅、锌,进行了硫酸浸锌—浸渣重选选铅试验。结果表明:在浸出温度为70℃、硫酸用量为15%、氢氟酸用量为3%、给料粒度为-0.5 mm、液固比为1.5、浸出时间为120 min条件下,可以获得锌浸出率为97.02%、浸渣铅品位为15.37%的指标,浸渣磨细至-0.045 mm占90%,经摇床1粗1精重选,获得的铅精矿铅品位为45.68%、含锌0.24%、铅作业回收率为89.98%,铅锌分离指标较好。铅锌尾渣浸出反应后所得浸渣结晶状态比较致密,有新物相生成;浸出过程铅转变为难溶硫酸铅,锌转变为易溶硫酸锌,从而可通过固液分离实现分离铅、锌。

Recovery of Pb and Zn from Pb-Zn Tailings in Yunnan by Beneficiation Metallurgy Combined Process

There is 9.87％ lead,6.25％ Zn in a lead-zinc tailings from Gejiu,Yunnan.Most of lead,zinc packaged each other with gangue,it is difficult to separate lead from zinc.Zinc leaching-gravity separation by shaking table experiment was put forward to recovery lead and zinc.Test results showed that:leaching temperature is 70 ℃,dosage of sulfuric acid is 15％,dosage of hydrofluoric acid is 15％,granularity of leaching materials extract is-0.5 mm,Iiquid-solid ratio is 1.5,leaching time is 120 min,zinc leaching rate can reach 97.02％,Pb grade of leaching residual is 15.37％,leaching residue ground to90％ passing 0.045 mm,via one roughing-one cleaning gravity separation by shaking table,lead concentrate with lead grade 45.68％,0.24％ Zn,lead recovery rate of 89.98％ was obtained,separation effect of lead and zinc is good.After leaching process,crystalline state of leaching residual is dense,and new mineral phrase was generated;lead changes into indissolvable lead sulfate,zinc changes into soluble zinc sulfate during leaching process,lead and zinc was separated through solid-liquid separation.