Study on Application and Selective Adsorption Mechanism of Combined Anionic/Cationic Collector in the Flotation Recovery of Low-Grade Lepidolite Ore AITranslate

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Chinese Library Classification Number:TD952[矿业工程—选矿]

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In the flotation of lepidolite ore in strongly acidic pulp system(pH=2~3) using amine collectors,different issues occur,including high consumption of H₂SO_4,serious corrosion of equipment,large viscosity of flotation foam,and difficult wastewater treatment.Using the tungsten-tin separation tailings(lepidolite flotation feed and Li_2O 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(dodecylamine,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 combined 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 Li_2O grade increases by 0.35% and the Li_2O recovery rate also increases by 1.41% in the obtained concentrate.Meanwhile,the flotation 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.