云南某铜选厂尾矿再选试验

云南某铜选厂矿石矿泥含量大，导致尾矿铜品位高并还含有大量矿泥。尾矿中铜主要分布在+37 μm粒级，铜在该粒级分布率为66.07%；-10 μm粒级产率为44.39%，而铜在该粒级分布率仅11.41%。采用旋流器预先脱泥、脱碳工艺进行预处理，在旋流器锥角为10°、沉砂口直径为3 mm、给矿压力为0.15 MPa、给矿浓度为11%时，获得的沉砂铜品位为2.35%、回收率为72.41%。沉砂中铜虽然主要以次生硫化铜形式存在，但铜的氧化率达30%以上。为确定沉砂的合理选矿工艺，进行了硫化铜、氧化铜依次选别和硫化铜、氧化铜混合选别探索性对比。结果表明，硫化铜、氧化铜依次选别工艺指标优于硫化铜、氧化铜混合选别工艺。采用硫化铜、氧化铜依次选别工艺，在磨矿细度为-0.074 mm占90%的条件下，以水玻璃、六偏磷酸钠为脉石抑制剂、硫化钠为氧化铜矿物活化剂、丁基黄药为捕收剂进行闭路浮选，获得了精矿铜品位为15.16%、作业回收率为81.05%、对原矿回收率为58.69%的选别指标。

Experiment on Reconcentration of Tailings from a Copper Plant in Yunnan

Slime content in a copper plant in Yunnan is very high，result in high copper grade in tailings.Tailings also has large amount of slime.Copper mainly exists in +37 μm fraction，with distribution rate of 66.07%，yield rate of -10 μm is 44.39%，while copper distribution is only 11.41%.Using cyclone desliming and decarburization pretreatment process，with hydrocyclone taper angle of 10°，grit mouth diameter of 3 mm，feeding pressure is 0.15 MPa，feeding concentration is 11%，grit with copper grade of 2.35% and recovery of 72.41% was obtained.Settling in copper mainly exists in form of secondary copper sulfide，oxidation rate of copper is above 30%.In order to determine reasonable settling separation process，copper sulfide and copper oxide in turn separation，and copper sulfide and copper oxide mixed separation principle process comparison was carried on.The results show that index of copper sulfide and copper oxide in turn separation process is better than that of copper sulfide and copper oxide mixed separation technique.At grinding fineness is 90% passing 0.074 mm，sodium silicate and sodium hexametaphosphate as the gangue inhibitors，sodium sulfide as the copper oxide mineral activator，butyl xanthate as collector，via three roughing-two cleaning-one scavenging closed circuit flotation process，copper concentrate with copper grade of 15.16% and yield recovery of 81.05% recovery to raw ore of 58.69% was obtained.