Study on Application and Selective Adsorption Mechanism of Combined Anionic/Cationic Collector in the Flotation Recovery of Low-Grade Lepidolite Ore
In the flotation of lepidolite ore in strongly acidic pulp system(pH=2～3)using amine collec-tors,different issues occur,including high consumption of H2 SO4,serious corrosion of equipment,large viscosity of flotation foam,and difficult wastewater treatment.Using the tungsten-tin separation tailings(lepidolite flotation feed and Li2O grade of 0.44％)from a polymetallic ore containing tungsten,tin,rubi-dium,and lithium in Hunan Province as the study object,a combined anionic(WJ)/cationic(dodecylam-ine,DDA)collector was used to conduct flotation recovery of the low-grade lepidolite ore under neutral pulp pH and non-desliming conditions,and the synergistic effects and adsorption mechanism of the com-bined collector were investigated by atomic force microscope(AFM)and pyrene fluorescence spectrum at microscopic level.The results show that compared with using DDA alone,when the combined WJ+DDA with a mass ratio of 3.5∶1 is used,the collector dosage decreases by 130 g/t,the Li2O grade increases by 0.35％and the Li2O recovery rate also increases by 1.41％in the obtained concentrate.Meanwhile,the flo-tation foam is fresh with less gangue entrainment.The molecules of the combined WJ+DDA collector are densely adsorbed on the surface of lepidolite and barely absorbed on the surface of quartz/feldspar.And compared with using WJ or DDA alone,the combined WJ+DDA collector exhibits greater non-polarity and stronger hydrophobicity,thus possessing higher surface activity.
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