Experiment and Mechanism Analysis of Enhanced Recycling Mud-containing Fine-grained Copper Sulfide Ore of Pulang by Combined Collectors

The optimization and the mechanism of collectors for the copper sulfide mine bearing fine copper minerals and mud in Pulang, Shangri-La were studied, because of the poor copper recovery using MCO as collector. The results of process mineralogy showed that the copper grade of the raw ore was 0.396%, in which the chalcopyrite was the main copper-bearing mineral and fine dissemination size. The main gangue minerals were quartz, chlorite, plagioclase, etc. The concentrate with a copper grade of 23.41% and a recovery of 82.15% was obtained from the flotation closed circuit test using the combined collector of MCO, CO100 and 250-A (dosage 36+4.5+2.5 g/t). Compared with MCO, the copper grade and the recovery were increased by 0.19% and 4.36% , respectively. The mechanism study results indicated that the adsorption mode of the combined collectors on chalcopyrite surface was chemical adsorption. The electrostatic repulsion force between the collector and chalcopyrite surface was reduced, therefore, the collector adsorption was significantly improved. Due to the higher selectivity and stronger collecting ability, the combined collector can recover fine copper sulfide minerals effectively.