云南某低品位铜矿石中伴生金的强化回收

云南某低品位铜矿石铜、金品位分别为0.35%、0.114 g/t,现场以丁基黄药为捕收剂,在磨矿细度为-0.075 mm占74.30%的条件下浮选选铜,并使金在铜精矿中富集,获得的铜精矿铜金回收率分别为91.60%和45.70%。为提高金的回收效果,以现场工艺流程为基础,以提高金回收率为主要目标进行了浮选选铜试验。结果表明,在磨矿细度为-0.075 mm占80%的情况下,以Z-200+丁铵黑药为捕收剂,730A为起泡剂,采用1粗3精2扫、中矿顺序返回的闭路试验流程回收铜和金,最终获得的铜精矿铜品位为22.48%、含金4.53 g/t、铜回收率为92.85%、金回收率为56.30%。可见,以Z-200+丁铵黑药为捕收剂,不仅能显著提高铜精矿金回收率10.60个百分点,而且能小幅提高铜回收率1.25个百分点。

Improvement of Associated Gold Recovery from a Low Grade Copper Ore in Yunnan Province

A copper ore in Yunnan Province contains 0.35% Cu，0.114 g/t Au，the recovery of copper and gold is 91.60% and 45.70% respectively through the on-site process，at the grinding fineness of 74.30% -0.075 mm using sodium butyl xanthate as copper collector.To improve the recovery of associated gold，copper flotation experiments were conducted based on the on-site process with gold recovery improving as goals.The results showed that copper concentrate with 22.48% Cu，4.53 g/t Au，Cu and Au recovery of 92.85% and 56.30% respectively was obtained through the closed-circuit flotation process of one roughing-three cleaning-two scavenging at grinding fineness of 80% -0.075 mm，and with ammonium dibutyl dithiophosphate and Z-200 as combined collector and 730A as frother.Therefore，Z-200 and ammonium dibutyl dithiophosphate as combined collector not only improves the index gold recovery in copper concentrate by 10.60 percentage points，but also increase copper recovery by 1.25 percentage points.