The effect of hydrofluoric acid (HF) pretreatment on flotation of feldspar and quartz using dodecylamine (DDA) as collector was investigated by microflotation, zeta potential, pyrene fluorescence spectroscopy, attenuated total reflection flourier transformed infrared spectroscopy (ATRFTIR), scanning electron microscope (SEM), Xray photoelectron spectroscopy (XPS) and bench scale flotation.