某低品位铜镍硫化矿石选矿试验

吉林某低品位铜镍硫化矿石铜品位为0.27%、镍品位为0.48%。矿石中含镍矿物主要为紫硫镍铁矿、镍黄铁矿，含铜矿物主要为黄铜矿、铜蓝、斑铜矿。试验研究表明，采用单一浮选流程不能获得较好的选别指标；由于矿石中紫硫镍铁矿、镍黄铁矿、黄铜矿等有用金属硫化物与磁铁矿嵌布关系密切，因此采用弱磁选对含镍矿物进行富集，获得目的矿物含量高、易泥化脉石含量低的磁性产品和目的矿物含量低、易泥化脉石含量高的非磁性产品，再分别进行磨浮流程处理。结果表明：原矿磨细至-0.074 mm占30%时进行弱磁选，磁性产品和非磁性产品分别再磨至-0.074 mm占85%后采用1粗2精2扫闭路浮选流程处理，获得了铜品位为4.53%、镍品位为6.65%、铜回收率为54.63%、镍回收率为44.90%的铜镍混合精矿1和铜品位为1.88%、镍品位为3.37%、铜回收率为23.98%、镍回收率为24.13%的铜镍混合精矿2，尾矿铜、镍品位分别降至0.06%和0.16%，实现了对该铜镍硫化矿石的有效分选。

Experimental Study on a Low-grade Copper-nickel Sulfide Ore

There is 0.27% copper and 0.48% nickel in a low grade copper-nickel sulfide ore from Jilin.Nickel mainly exists in form of violarite, pentlandite.Copper mainly exists in form of chalcopyrite, covellite, bornite.Experiments indicated that, good index cannot be obtained by single flotation process.Low intensity magnetic separation was brought in for enrichment of nickel-bearing minerals, for violarite, pentlandite and chalcopyrite is closely associated with magnetite.The magnetic products with high content of object minerals and low content of gangue minerals easy to sliming, and nonmagnetic products with low content of object minerals and high content of gangue minerals easy to sliming were obtained, and then treated by grinding and flotation operation, respectively.Results indicated that: magnetic separation at the grinding fineness of 30% passing 0.074 mm, and regrinding magnetic products and nonmagnetic products to 85% passing 0.074 mm and then endure one roughing-two cleaning-two scavenging closed circuit flotation operation, respectively.Copper and nickel mixed concentrate 1 with copper grade and recovery of 4.53% and 54.63%, nickel grade and recovery of 6.65% and 44.90%, nickel mixed concentrate 2 with copper grade and recovery of 1.88% and 23.98%，nickel grade and recovery of 3.37% and 24. 13% respectively were obtained.Effective separation on copper and nickel sulfide ore was realized.