某金精矿中铅综合回收流程对比试验研究

Experimental Study on the Comprehensive Recovery Process of Lead in A Gold Concentrate

为了有效回收某金精矿中的铅,针对金品位45. 60 g/t、铅3. 01%的浮选金精矿,进行了选矿流程方案技术经济对比。试验结果表明:最终采用铅硫分离—铅、硫精矿分别再磨浸出工艺替代原有金精矿再磨浸出工艺,不仅可以综合回收伴生的方铅矿,而且可提高金银回收率,获得指标为:铅精矿铅品位56. 73%、回收率79. 83%,金总回收率为94. 55%,银总回收率为91. 67%,分别高出现场生产工艺3. 85、9. 42个百分点。该工艺解决了从原矿直接进行金、铅分离成本高、从浸渣中回收泥化方铅矿难的问题,分别再磨浸出避免了部分金进入铅精矿中导致金收益低的问题,有效提高了该类伴生资源综合利用水平。

Taking a gold concentrate containing45.60g/t Au and3.01%Pb as the research object,a process of lead-sulfur flotation separation,regrinding and leaching was finally selected to replace the original regrinding-leaching process based on the technical and economic comparison of beneficiation process.The associated galena was comprehensively recovered with a grade of 56.73% and a recovery of 79.83% in the lead concentrate,and the recoveries of gold and silver were also improved.The total recoveries of gold and silver were 94.55% and 91.67%,respectively,which were 3.85 and 9.42 percentage points higher than those of the original process.The process solves the problem of high production cost from raw ore and the difficulty in recovering fine-grained galena from the leaching residues.Meanwhile,separate grinding and leaching avoids the misplacement of some gold in lead concentrate,thereby effectively improving the comprehensive utilization level of associated resources.