Abstract:In the flotation system of chalcopyrite and serpentine, the aggregation-dispersion state between chalcopyrite and serpentine is mainly caused by the difference in Zeta potential between serpentine and chalcopyrite. In this work, the aggregation-dispersion state between serpentine and chalcopyrite was regulated by adjusting the concentrations of Ca2+, Mg2+and slurry pH. The results showed that the desorption rate of serpentine slime and the floatability of chalcopyrite could be improved by appropriately increasing the concentrations of Ca2+and Mg2+and slurry pH. Under the optimal conditions, the recovery rate of chalcopyrite in mixed ore could be increased from 16.68% to 74.05%. Ca2+ and Mg2+ were mainly adsorbed on the surfaces of chalcopyrite and serpentine in the form of CaOH+, Ca (OH)2(aq), MgOH+, and Mg(OH)2 precipitates, reducing the long-range attraction and adhesion between chalcopyrite particles and serpentine surfaces by altering the mineral Zeta potentials. The research results can provide theoretical and technical support for the application of metal ions in regulating the aggregation-dispersion of mineral particles.