| In China 95% energy and 85% raw materials were derived from mineral sources, however, large amounts of mining wastewater were produced in the large-scale mining development. Upon the grim situation of water resource and the requirement of water reuse, sub quality treatment of wastewater attracted lots of focus, which has been the main developent trend in the purification and resourcfulization of mining wastewater.In this study, artificial simulated wastewater were used to investigate the influence of xanthate, Cu2+ and S2- on the selective flotation of chalcopyrite-molybdenite. Moreover, flotation using wastewater produced in the lab were also carried out herein. A series of testing facilities as IR, Zeta potential and flotation solution chemistry have been used to analyse the mechanisms.The major findings from this investigation were summarized below:(1)The effects on the flotation of chalcopyrite-molybdenite varied according to the species and quantities of ions. They could be ranked as Cu2+>xanthate> S2-according to their impact strength.When the concentration of Cu2+ and S2- were beyond 2 mg/L and 5 mg/L,or the concentration of xanthate was 2～10mg/L,the wastewater must be treated before reuse. From the results obtained above, the proper proportion of wastewater was below 60%;(2)The infrared spectroscopy tests confirmed copper butyl xanthate was the final interaction product of chalcopyrite and butyl xanthate. The occurrence of this interaction altered the flotability of mineral by changing their zeta potentials. Cu2+ was the compositon ion of the chalcopyrite lattice, Cu2+adsorption increased the surface density of Cu2+,thus strengthing the depression capacity. The depression mechanism of S2- could be attributed to the hydrolysate HS-. |
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