Abstract: Taking rhodochrosite and gangue carbonate minerals dolomite,calcite and siderite as the research objects,the effects of the pH value of the slurry and the amount of chemicals in the new green flotation system on the four flotation behavior and interfacial interaction mechanism of carbonate minerals. The results show that the collector ZJS and the inhibitor JBS have a strong synergistic effect and are the best combination of agents for the reverse flotation separation of rhodochrosite and gangue carbonate minerals. The dosage of collector ZJS is 60 mg/ L,and the inhibitor JBS is 60 mg/ L. When the dosage of JBS agent is 20 mg/ L,the recovery of rhodochrosite is only 10%,the recovery of dolomite is more than 40%,and the recovery of calcite and siderite is more than 55%. Zeta potential,FTIR and XPS analysis results show that in the ZJS collection system,the inhibitor JBS acts on the interfaces of four carbonate minerals in a physical adsorption manner,and the adsorption capacity of JBS at the rhodochrosite interface is stronger than that of other gangue carbonates. The mineral makes rhodochrosite more hydrophilic and can be separated by reverse flotation. This new flotation system is expected to remove part of the calcium,magnesium and iron ions from high-grade manganese carbonate ore or magnetically separated manganese carbonate concentrate,providing a basis for further upgrading and reducing impurities in manganese carbonate ore.

Key words: rhodochrosite,reverse flotation,carbonate gangue minerals,new collectors,new inhibitors