Abstract: Aiming at the characteristics of a low-grade copper and nickel sulfide ore in Guangxi, development and utilization of the ore were carried out by the process of Cu-Ni bulk flotation-copper floating and nickel inhibiting. The results showed that with oxalate as activator of Cu-Ni bulk flotation, activated carbon as reagent removal for separation of Copper and Nickel, the lime, sodium sulphite and SY as the combining depressant for separation of copper and nickel, copper concentrate with Cu grade of 15.24% and recovery of 76.65%, and nickel concentrate with Ni grade of 4.90% and recovery of 82.36% were obtained by adopting the process of one roughing and four scavenging for Cu-Ni bulk flotation, one roughing, two cleaning and two scavenging for separation copper and nickel, and middles back to the flowsheet in turn.

Key words: Copper-nickel sulfide ore, Bulk flotation, Reagent removal with activated carbon, Combining depressants