| As a common associated mineral resource,chalcopyrite and molybdenite are difficult to separate in mineral processing.At present,the method of using a redox agent to adjust the pulp potential for copper-molybdenum separation has disadvantages such as unstable pulp potential,large consumption of chemicals,high production cost and environmental pollution.External control potential flotation can stably control the pulp potential and reduce environmental pollutionThe chalcopyrite and molybdenite used in this paper are taken from Daye,Hubei Province and Dayu,Jiangxi Province,respectively.The copper-molybdenum bulk concentrate is taken from Wunugetushan,Inner Mongolia.The self-control potential flotation cell is used as the experimental device and the copper mesh as added electrode The effects of different particle size,different pulp pH and external control potential on the flotation behavior of chalcopyrite and molybdenite were studied in detail.The difference of flotation behavior between chalcopyrite and molybdenum ore in the butyl xanthate system and the butyl-free xanthate system were investigated;the influence of external control potential on the separation of actual minerals from artificial mixed ore and copper-molybdenum bulk concentrate;The reasons for the flotation behavior of chalcopyrite and molybdenite in the influence of external control reduction potential on yellow were investigated by electrochemical analysis and XPS analysisThe pure mineral flotation test showed that the external controlled reduction potential has a strong inhibitory effect on the 45-150 μm grained chalcopyrite,the inhibitory effect on the-45 μm chalcopyrite is weak and the effect of floatability is small.The environment with a pH of 6 to 11 is more conducive to "copper-reducing molybdenum".The floatability of chalcopyrite and molybdenite decreases with the decrease of external control potential,and chalcopyrite is more susceptible than molybdenite.External control potential flotation can be effective for different proportions of the separation of chalcopyrite and molybdenite Separation;the presence of butyl xanthate weakens the floatability of chalcopyrite and molybdenite by externally controlled potentials.The low reduction potential of external control potential of-200～0 mV(vs.Ag/AgCl)can promote the adsorption of butyl xanthate on the surface of chalcopyrite and molybdenite;when the external control potential is lower than-200 mV(vs.Ag)/AgCl),butyl xanthate gradually desorbed from the surface of chalcopyrite and molybdenite;regardless of the presence or absence of butyl xanthate in the flotation system,the externally controlled reduction potential on the pyrite ore associated with copper-molybdenum ore Both mines and chalcopyrites have significant inhibitory effects.The separation results of copper-molybdenum bulk concentrate showed that Mo rougher concentrate containing 7.50%Mo,27.55%Cu,recovers of Mo 84.34%,Cu 31.36%was achieved by one-time flotation with controlled potential-1200 mV.The molybdenum enrichment ratio and molybdenum recovery rate obtained by external controlled potential flotation are higher than what by the addition of sodium sulfide and sodium thioglycolate.Chalcopyrite and molybdenite are relatively stable at the reduction potential,and chalcopyrite is more susceptible to oxidation than molybdenite at the oxidation potential.In the galvanic corrosion behavior of chalcopyrite and molybdenum ore,copper ore is oxidized as an anode and molybdenite acts as a cathode without oxidation.XPS analysis found that the external control reduction potential caused the formation of hydrophilic Fe-O-OH on the surface of the chalcopyrite,which resulted in the hydrophilicity of the surface and decrease of the floatability of chalcopyrite;However,the surface material of the molybdenite did not change and maintained a good floatability.This makes it possible to separate the copper-molybdenum bulk concentrate by external controlled potential flotation. |
PDF Full Text Request