国外某含铜金矿石选矿工艺优化与生产实践

国外某含铜硫化金矿石采用硫（金）浮选-金精矿氰浸-活性炭吸附工艺回收金。由于金精矿中含铜高达1.15%，氰化浸金时，铜矿物不仅影响金的氰化浸出（氰化物对金的选择性不及对铜的选择性），而且铜矿物的浸出大量消耗氰化物，造成氰化物消耗量大；浸出液含铜高，炭吸附金时产生高铜炭，炭浸尾渣除氰漂白粉耗量高；且后续金冶金环节，高铜炭解吸和精炼时间长、成本高，活性炭再生难度大，炭吸附能力下降。为解决因金精矿含铜高所带来的一系列问题，在对金铜混浮-精矿再磨-铜硫(金)分离工艺流程进行试验研究的基础上，完成了现场工艺改造。生产实践证明，采用该工艺处理现场矿石，可取得金品位为13.09 g/t、含铜0.07%、金回收率为35.00%的金精矿和铜品位为14.00%、含金203.69 g/t、金回收率为60.00%、铜回收率为92.00%的铜精矿。工艺改造后，氰化物等药剂用量及生产成本大大降低，金回收率明显提高，并产出了铜精矿，企业获得了显著的经济效益。

Beneficiation Optimization and Production Practice for a Foreign Gold Ore with Copper

From a foreign copper-containing gold sulfide，gold is recovered by the flotation sulfur (gold)-cyanide leaching-carbon adsorption processing.As the gold concentrate contains the copper of 1.15%，when leached gold with cyanide，copper leaching not only affect the gold cyanide leaching (effect of cyanide on gold is less than copper)，but also consume large amount of cyanide.Leaching solution contain high content of copper，and high-copper carbon is produced when carbon adsorb gold，resulting that more bleaching powder for removing the cyanide is consumed.In gold metallurgy processing，that high-copper carbon is desorbed and refined needs a long time and high cost.Also，it is difficult for carbon regeneration，and carbon adsorption capacity is decreased.In order to resolve the series of problems in gold concentrates with high copper，on the basis of the experimental study on mix flotation of gold and copper-concentrate regrinding-separation of copper and sulfur(gold)，the processing on site was optimized to realize the gold concentrate with Au grade of 13.09 g/t and Cu grade of 0.07% and the Au recovery of 35.00%，and copper concentrate with Cu grade of 14.00% and the Cu recovery of 60.00% and Au grade of 203.69 g/t and the Au recovery of 92.00%.After the process optimized，the consumption and cost of cyanide and other reagents are decreased obviously，and the gold recovery is increased significantly with copper concentrate produced.Therefore，the enterprise obtains a significant economic benefit.