Abstract:A low-grade copper-nickel ore contains 0.50% nickel, 0.15% copper. The content of gold and silver is lower, and the content of magnesium is higher. Gangue minerals contain a large amount of calcium-magnesium minerals with good floatability, such as serpentine and talc. At the same time, the nickel oxidation rate in the raw ore is relatively high, which is difficult to select low-grade copper-nickel ore. In order to efficiently and comprehensively recover valuable metal resources, the ore beneficiation technology was tested and studied. Under the process structure of "copper-nickel mixed float-copper-nickel separation" and the grinding fineness of -74μm accounts for 75%, the copper-nickel mixed float adds acidified water glass and CMC together as an inhibitor of gangue minerals. Use copper sulfate to activate nickel minerals, and select amyl xanthate with strong collecting ability as collector. For copper-nickel mixed concentrates, add activated carbon for drug removal, and lime inhibits nickel minerals and realizes the separation of copper-nickel mineral. The closed-circuit test of the whole process can get 28.84% copper, 74.18% copper recovery, 0.62% nickel, 0.41% nickel recovery, copper concentrate containing 3.30g/t gold and 70g/t silver, 6.61% nickel. The nickel recovery rate is 81.80%, and the nickel concentrate containing 0.40% copper and 19.27% copper has a better separation effect of copper and nickel. The gold and silver in the