摘要
在黄铜矿浮选过程中,矿物表面的粗糙度及黄药浓度的变化会直接影响气泡与矿物表面的黏附和铺展,从而影响浮选效果。为了探究黄铜矿表面的粗糙度和黄药浓度对气泡与黄铜矿碰撞黏附行为的影响,使用砂纸对黄铜矿进行打磨,得到不同粗糙度的样品,然后进行气泡在矿物表面的碰撞黏附试验,并对气泡局部速度、气泡碰撞黏附时间、三相接触线长度随时间的变化、气泡接触角进行了测试分析。结果表明:粗糙度较大的黄铜矿表面有尺寸较大、数量较多的粗糙结构,会促进气泡与矿物表面之间水化膜的薄化和破裂,有利于黏附的形成,但黏附产生后黄铜矿表面的粗糙结构阻碍了气泡在矿物表面的进一步铺展;黄药浓度的增加使得黄铜矿表面生成的疏水性薄膜厚度增加,增强了对样品表面粗糙结构的覆盖作用和黄铜矿表面的负电性,提高了黄铜矿的疏水性,不利于气泡与黄铜矿形成黏附,但有利于气泡在黄铜矿表面形成黏附后的进一步铺展。该成果可用于黄铜矿的高效浮选回收利用研究。
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.
作者
章程
陈雨婷
彭耀丽
谢广元
夏文成
ZHANG Cheng;CHENG Yuting;PENG Yaoli;XIE Guangyuan;XIA Wencheng(School of Chemical Engineering&Technology,China University of Mining and Technology,Xuzhou 221116,China)
出处
《金属矿山》
CAS
北大核心
2024年第4期127-134,共8页
Metal Mine
关键词
表面粗糙度
三相接触线
粗糙结构
疏水性薄膜
surface roughness
three-phase contact line
rough structure
hydrophobic film
