某金矿选矿工艺试验研究

Experimental research on the ore-dressing process in a gold mine

某金矿石中可供回收的有价元素为金,品位为1.78 g/t,现场生产流程为全泥氰化浸出工艺,为解决矿山面临的环保压力,实现清洁生产,探索新的选矿工艺替代现有全泥氰化浸出工艺。在工艺矿物学研究基础上,通过单一浮选、重选+浮选选矿工艺流程对比,确定采用重选+浮选工艺流程。结果表明:重选+浮选工艺流程获得的重选精矿金品位3034.60 g/t,浮选精矿金品位16.85 g/t,重选+浮选金总回收率94.80%,金回收指标与现场全泥氰化浸出工艺指标相当。对浮选精矿进行金硫分离探索试验,获得了金品位68.25 g/t、金作业回收率84.95%的金精矿,硫品位42.21%、含金3.25 g/t的硫精矿。研究结果为同类矿山实现清洁生产提供了参考借鉴。

The content of the recoverable valuable element is gold in a gold ore and the grade is 1.78 g/t.The on-site production process is all-sliming cyanide leaching process.To solve the pressure of environmental protection challenges faced by the mine and realize green production,new ore-dressing processes are explored to replace the existing all-sliming cyanide leaching process.Based on process mineralogy research,the process flows of single flotation and gravity separation+flotation were compared,and the latter was chosen.The test results show that the gravity separation+flotation process obtained the gravity concentrate gold grade 3034.60 g/t,flotation concentrate gold grade 16.85 g/t,and the gold total recovery of gravity separation and flotation is 94.80%.The gold recovery index of gravity separation+flotation process is similar to that of the on-site all-sliming cyanide leaching process.A gold concentrate with a gold grade of 68.25 g/t and gold recovery rate of 84.95%and a sulfur concentrate with a sulfur grade of 42.21%and gold content of 3.25 g/t were obtained by an experimental study on gold and sulfur separation of flotation gold concentrate.The research result provides some references for similar mines to realize green production.