Abstract: In a copper-nickel ore concentrator of Jilin, the process of washing-gravity separation-flotation for the undersize products by 18 mm screening and the process of crushing-grinding-asynchronous flotation-gravity separation for oversize products are adopted to handle the low grade sulfide copper-nickel ore.Even if these processes are complicated and long flow, the efficiency of concentration is low.So the ore beneficiation process was optimized.The results showed that with the simple asynchronous flotation process for the ore, copper-nickel mixed concentrate with Ni grade of 7.47%, Ni recoveries of 82.57%, Cu grade of 2.19% and Cu recovery of 91.74% were obtained under the grinding fineness of -0.074 mm 70%.Compared with the on-site tests, the process and the pharmaceutical system have been greatly simplified, and the Cu, Ni beneficiation efficiency were increased by 13.90% and 5.49% respectively.The research provides a basis for the technical transformation of the site production process.

Key words: Low-grade copper-nickel sulfide ore, Process optimization, Efficiency of concentration