Abstract:With the increasing scarcity of copper resources, " poor, fine and miscellaneous " has become a common feature of copper resources. As an important supplement to the shortage of copper resources in the future, how to ensure its efficient recovery is an important issue to realize the comprehensive utilization of copper resources. In this study, the effects of new vulcanizing agent sodium trithiocarbonate () and traditional vulcanizing agent sodium sulfide () on the flotation of fine malachite were compared, and the effects of two vulcanizing agents on flotation performance and their mechanism were discussed. The effects of pulp pH value, vulcanizing agent dosage and collector dosage on malachite recovery rate were analyzed by single mineral flotation test. At pH 9, concentration 2×10?? mol/L, butyl xanthate concentration 1×10?? mol/L; under the optimum flotation conditions of pH value of 9, concentration of3×10?3 mol/L and butyl xanthate concentration of 1×10?? mol/L, the recovery of malachite reached 92.46 % and 69.09 %, respectively. The flotation effect of was significantly better than that of . Contact angle test, XPS analysis, Zeta potential test and adsorption capacity test further revealed the change of surface chemical properties of malachite after vulcanization treatment and its effect on the adsorption of subsequent collectors. It was found that more active copper sulfide was generated on the surface of malachite after vulcanization, which improved the adsorption effect of butyl xanthate and significantly enhanced the flotation performance of malachite. This study provides experimental verification and theoretical support for optimizing the recovery of fine-grained copper oxide ore resources.