Study on Collision and Adhesion Mechanism between Bubbles and Chalcopyrite Surface with Different Roughness in Xanthate Solution System
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 investi-gate the influence of the roughness of chalcopyrite surface and the concentration of xanthate on the collision and adhesion be-havior of bubbles and chalcopyrite,the samples with different roughness were obtained by grinding chalcopyrite with sandpa-per,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 bub-bles 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 concentra-tion 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 u-tilization of chalcopyrite.
surface roughnessthree-phase contact linerough structurehydrophobic film
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NSTL
万方数据
维普
