Abstract: In the process of chalcopyrite flotation,the change of mineral surface roughness and xanthate concentration will directly affect the adhesion and spreading of bubbles and mineral surface,thus affecting the flotation effect. In order to investigate the influence of the roughness of chalcopyrite surface and the concentration of xanthate on the collision and adhesion behavior of bubbles and chalcopyrite,the samples with different roughness were obtained by grinding chalcopyrite with sandpaper, and then the collision and adhesion test of bubbles on the mineral surface was carried out. The local velocity of bubbles, the collision and adhesion time of bubbles,the change of three-phase contact line length with time and the contact angle of bubbles were tested and analyzed. The results showed that the surface of chalcopyrite with larger roughness had a larger size and a larger number of rough structures,which promoted the thinning and rupture of the hydration film between the bubbles and the mineral surface,which was conducive to the formation of adhesion. However,after adhesion occurred,the rough structures of chalcopyrite surface hindered the further spreading of bubbles on the chalcopyrite surface. The increase of xanthate concentration increased the thickness of the hydrophobic film formed on the surface of chalcopyrite,enhanced the covering effect of the rough structure and the electronegativity on the surface of the chalcopyrite,improved the hydrophobicity of chalcopyrite. It was not conducive to the formation of adhesion between bubbles and chalcopyrite,but was conducive to the further spreading of bubbles after adhesion on the surface of chalcopyrite. The results can be used for the study of efficient flotation recovery and utilization of chalcopyrite.

Key words: surface roughness,three-phase contact line,rough structure,hydrophobic film